/**
 * Personal Resume Website - Styles
 * 烨鄚 (Eamon) Resume Website
 */

/* ========================================
   CSS Variables - Theme System
   ======================================== */

:root {
  /* Light Theme Colors (Default) */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a68;
  --color-accent: #3b82f6;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.08);

  /* Typography Scale */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-chinese: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */

  /* Spacing System */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-24: 6rem;     /* 96px */

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-theme: 250ms ease;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg-primary: #0f0f14;
  --color-bg-secondary: #1a1a24;
  --color-text-primary: #f0f0f5;
  --color-text-secondary: #a0a0b0;
  --color-accent: #60a5fa;
  --color-border: #2a2a3a;
  --color-card-bg: #1a1a24;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
}

/* ========================================
   Base Styles
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-base), var(--font-family-chinese);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-theme), color var(--transition-theme);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-text-primary);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ========================================
   Layout
   ======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-6);
}

.nav-brand {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--color-text-primary);
}

.brand-first {
  color: var(--color-text-primary);
}

.brand-last {
  color: var(--color-accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
}

.nav-links {
  display: flex;
  gap: var(--spacing-6);
}

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link.active {
  color: var(--color-accent);
  font-weight: 500;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

/* Theme icon with smooth transition */
.theme-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-theme), opacity var(--transition-theme);
}

.theme-icon svg {
  width: 20px;
  height: 20px;
}

.theme-toggle:active .theme-icon {
  transform: scale(0.9);
}

.main {
  padding-top: 80px; /* Account for fixed header */
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-16) var(--spacing-6);
}

.footer {
  text-align: center;
  padding: var(--spacing-8) var(--spacing-6);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

/* ========================================
   Responsive Breakpoints
   ======================================== */

/* Small devices (640px and up) */
@media (min-width: 640px) {
  .section {
    padding: var(--spacing-16) var(--spacing-8);
  }
}

/* Medium devices (768px and up) */
@media (min-width: 768px) {
  .section {
    padding: var(--spacing-24) var(--spacing-8);
  }
}

/* Large devices (1024px and up) */
@media (min-width: 1024px) {
  .nav {
    padding: var(--spacing-4) var(--spacing-8);
  }
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
  min-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--spacing-8);
  padding-bottom: var(--spacing-8);
  position: relative;
}

/* Full page hero for index page (no footer) */
.hero-fullpage {
  min-height: calc(100vh - 80px);
}

/* Page section for other pages */
.page-section {
  min-height: calc(100vh - 80px - 60px); /* Account for header and footer */
  display: flex;
  flex-direction: column;
  padding-top: var(--spacing-12);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-12);
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

@media (min-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

/* Hero Badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  width: fit-content;
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

[data-theme="dark"] .hero-badge {
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.15) 0%, rgba(96, 165, 250, 0.05) 100%);
  border-color: rgba(96, 165, 250, 0.3);
}

.badge-icon {
  font-size: var(--font-size-sm);
}

.badge-text {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: 500;
}

/* Hero Text */
.hero-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.hero-greeting {
  font-size: var(--font-size-2xl);
  color: var(--color-text-primary);
  font-weight: 400;
  margin: 0;
}

.hero-name {
  margin: 0;
}

.name-english {
  display: block;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero-name-chinese {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-weight: 400;
  margin: var(--spacing-1) 0 0 0;
}

.hero-title {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: var(--spacing-2) 0 0 0;
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 480px;
  margin: 0;
}

/* Hero CTA */
.hero-cta {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
  margin-top: var(--spacing-2);
}

/* Hero Avatar */
.hero-avatar {
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: visible;
  padding: 30px;
}

.avatar-wrapper {
  position: relative;
  width: 340px;
  height: 340px;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.avatar-wrapper:active {
  animation: jellyFloat 0.8s ease;
}

@keyframes jellyFloat {
  0% { transform: translateY(0); }
  15% { transform: translateY(12px); }
  30% { transform: translateY(-16px); }
  45% { transform: translateY(8px); }
  60% { transform: translateY(-6px); }
  75% { transform: translateY(3px); }
  90% { transform: translateY(-1px); }
  100% { transform: translateY(0); }
}

@media (min-width: 768px) {
  .avatar-wrapper {
    width: 400px;
    height: 400px;
  }
}

@media (min-width: 1024px) {
  .avatar-wrapper {
    width: 450px;
    height: 450px;
  }
}

.avatar-ring {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  border: 3px solid var(--color-accent);
  opacity: 0.3;
  animation: avatarPulse 3s ease-in-out infinite;
}

@keyframes avatarPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.15;
  }
}

.avatar-image {
  position: absolute;
  inset: 20px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background-color: var(--color-bg-secondary);
  border: 4px solid var(--color-card-bg);
  box-shadow: var(--shadow-lg);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.avatar-image svg {
  width: 100%;
  height: 100%;
}

/* Floating decoration icons around avatar */
.floating-icon {
  position: absolute;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  color: var(--color-accent);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-theme), border-color var(--transition-theme);
  z-index: 10;
}

.floating-icon:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.floating-icon svg {
  width: 24px;
  height: 24px;
}

/* Position floating icons around the avatar */
.floating-icon-1 {
  top: 15%;
  right: 0;
  animation: floatIcon1 4s ease-in-out infinite;
}

.floating-icon-2 {
  bottom: 20%;
  right: 0;
  animation: floatIcon2 5s ease-in-out infinite;
}

.floating-icon-3 {
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  animation: floatIcon3 4.5s ease-in-out infinite;
}

@keyframes floatIcon1 {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes floatIcon2 {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-8px) rotate(5deg); }
}

@keyframes floatIcon3 {
  0%, 100% { transform: translateY(-50%) translateX(0); }
  50% { transform: translateY(calc(-50% - 8px)) translateX(-5px); }
}

/* Scroll Indicator */
.hero-scroll {
  position: absolute;
  bottom: var(--spacing-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--color-text-secondary);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
  cursor: pointer;
}

.hero-scroll:hover {
  opacity: 1;
}

.scroll-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.scroll-icon {
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(8px);
  }
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-height: 48px;
  text-decoration: none;
}

.btn-arrow {
  transition: transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: var(--shadow-md);
  padding: var(--spacing-3) var(--spacing-8);
}

.btn-primary:hover {
  background-color: var(--color-text-primary);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover .btn-arrow {
  transform: translateX(4px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
  padding: var(--spacing-3) var(--spacing-6);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* Mobile styles are consolidated in the Mobile Responsiveness section at the end of this file */


/* ========================================
   Section Common Styles
   ======================================== */

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
}

.section-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

/* ========================================
   Education Section
   ======================================== */

.education-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-theme), 
              border-color var(--transition-theme),
              box-shadow var(--transition-fast);
}

.education-card:hover {
  box-shadow: var(--shadow-lg);
}

.education-main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
  padding-bottom: var(--spacing-8);
  border-bottom: 1px solid var(--color-border);
}

.education-school {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.school-name {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-text-primary);
}

.school-college {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.education-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.info-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.info-value {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  font-weight: 500;
}

.info-value.highlight {
  color: var(--color-accent);
}

.education-courses {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.courses-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

.courses-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.course-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), 
              color var(--transition-fast);
}

.course-tag:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Education Section - Desktop Enhancement */
@media (min-width: 768px) {
  .education-main {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }

  .education-info {
    grid-template-columns: repeat(2, auto);
    gap: var(--spacing-6);
    text-align: right;
  }

  .info-item {
    align-items: flex-end;
  }
}


/* ========================================
   Projects Section
   ======================================== */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

.project-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast),
              background-color var(--transition-theme);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.project-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.3;
}

.project-type {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: background-color var(--transition-theme);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border);
}

.project-meta .meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.project-meta .meta-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.project-meta .meta-value {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  font-weight: 500;
}

.project-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.project-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.project-section-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.project-responsibilities,
.project-achievements {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.project-responsibilities li,
.project-achievements li {
  position: relative;
  padding-left: var(--spacing-6);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.project-responsibilities li::before {
  content: '•';
  position: absolute;
  left: var(--spacing-2);
  color: var(--color-accent);
  font-weight: bold;
}

.project-achievements li::before {
  content: '✓';
  position: absolute;
  left: var(--spacing-2);
  color: var(--color-accent);
  font-weight: bold;
}

/* Projects Section - Desktop Enhancement */
@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
  }

  .project-card {
    padding: var(--spacing-8);
  }

  /* Make first project card span full width for emphasis */
  .project-card:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .project-card:first-child {
    grid-column: 1 / 2;
  }
}


/* ========================================
   Skills Section
   ======================================== */

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

.skill-category {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-theme),
              border-color var(--transition-theme),
              box-shadow var(--transition-fast);
  /* Animation setup - initially hidden */
  opacity: 0;
  transform: translateY(20px);
}

.skill-category.visible {
  animation: skillFadeIn 400ms ease-out forwards;
}

/* Staggered animation delays for each category */
.skill-category:nth-child(1).visible { animation-delay: 0ms; }
.skill-category:nth-child(2).visible { animation-delay: 100ms; }
.skill-category:nth-child(3).visible { animation-delay: 200ms; }
.skill-category:nth-child(4).visible { animation-delay: 300ms; }
.skill-category:nth-child(5).visible { animation-delay: 400ms; }

@keyframes skillFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skill-category:hover {
  box-shadow: var(--shadow-lg);
}

.skill-category-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
  padding-bottom: var(--spacing-3);
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

/* Consistent styling for all skill tags - Property 3 compliance */
.skill-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast);
  /* Staggered animation for individual items */
  opacity: 0;
}

.skill-category.visible .skill-tag {
  animation: skillItemFadeIn 300ms ease-out forwards;
}

/* Staggered delays for skill items within each category */
.skill-category.visible .skill-tag:nth-child(1) { animation-delay: 50ms; }
.skill-category.visible .skill-tag:nth-child(2) { animation-delay: 100ms; }
.skill-category.visible .skill-tag:nth-child(3) { animation-delay: 150ms; }
.skill-category.visible .skill-tag:nth-child(4) { animation-delay: 200ms; }
.skill-category.visible .skill-tag:nth-child(5) { animation-delay: 250ms; }
.skill-category.visible .skill-tag:nth-child(6) { animation-delay: 300ms; }
.skill-category.visible .skill-tag:nth-child(7) { animation-delay: 350ms; }
.skill-category.visible .skill-tag:nth-child(8) { animation-delay: 400ms; }

@keyframes skillItemFadeIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.skill-tag:hover {
  background-color: var(--color-accent);
  color: #ffffff;
  transform: translateY(-2px);
}

/* Skills Section - Desktop Enhancement */
@media (min-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
  }

  /* Make soft skills span full width on medium screens */
  .skill-category:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .skill-category:last-child {
    grid-column: auto;
  }

  /* Adjust layout for 5 categories on large screens */
  .skill-category:nth-child(4),
  .skill-category:nth-child(5) {
    grid-column: auto;
  }
}


/* ========================================
   Contact Section
   ======================================== */

.contact {
  text-align: center;
}

.contact-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-6);
  max-width: 900px;
  margin: 0 auto;
}

/* 联系方式介绍文字 */
.contact-intro {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 0;
}

.contact-items {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
  width: 100%;
}

@media (min-width: 640px) {
  .contact-items {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .contact-items {
    grid-template-columns: repeat(3, 1fr);
  }
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-6);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              background-color var(--transition-theme);
  cursor: pointer;
  text-align: center;
}

.contact-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  color: var(--color-accent);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  flex-shrink: 0;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast);
}

.contact-item:hover .contact-icon {
  background-color: var(--color-accent);
  color: #ffffff;
  transform: scale(1.1);
}

.contact-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-1);
  flex: 1;
  min-width: 0;
}

.contact-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.contact-value {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
  word-break: break-all;
}

.contact-copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast);
  flex-shrink: 0;
  margin-top: var(--spacing-2);
}

.contact-copy-btn:hover {
  background-color: var(--color-accent);
  color: #ffffff;
  transform: scale(1.1);
}

.contact-copy-btn:active {
  transform: scale(0.95);
}

/* Social Links */
.social-links {
  display: flex;
  gap: var(--spacing-6);
  justify-content: center;
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
  width: 100%;
  max-width: 400px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  color: var(--color-text-secondary);
  background-color: var(--color-card-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast),
              color var(--transition-fast),
              background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.social-link:hover {
  transform: scale(1.15) rotate(5deg);
  color: #ffffff;
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.social-link:active {
  transform: scale(1.05);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: var(--spacing-8);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--spacing-3) var(--spacing-6);
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: transform 300ms ease,
              opacity 300ms ease,
              visibility 300ms ease;
  z-index: 1000;
}

.toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

.toast-message {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

/* Contact Section - Desktop Enhancement */
@media (min-width: 768px) {
  .contact-container {
    gap: var(--spacing-16);
  }
}


/* ========================================
   Scroll Animations
   Requirements: 2.3, 6.2, 6.3
   All animations complete within 500ms
   ======================================== */

/* Keyframes for fadeIn animation */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Keyframes for slideUp animation */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Keyframes for fadeInSlideUp (combined) - 400ms duration */
@keyframes fadeInSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Generic animate-on-scroll class */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 400ms ease-out, transform 400ms ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Education card animation */
.education-card {
  opacity: 0;
  transform: translateY(20px);
}

.education-card.visible {
  animation: fadeInSlideUp 400ms ease-out forwards;
}

/* Project card animations with staggered delays */
.project-card {
  opacity: 0;
  transform: translateY(20px);
}

.project-card.visible {
  animation: fadeInSlideUp 400ms ease-out forwards;
}

/* Staggered animation delays for project cards */
.project-card:nth-child(1).visible { animation-delay: 0ms; }
.project-card:nth-child(2).visible { animation-delay: 100ms; }
.project-card:nth-child(3).visible { animation-delay: 200ms; }
.project-card:nth-child(4).visible { animation-delay: 300ms; }

/* Contact item animations */
.contact-item {
  opacity: 0;
  transform: translateY(15px);
}

.contact-item.visible {
  animation: fadeInSlideUp 350ms ease-out forwards;
}

/* Staggered animation delays for contact items */
.contact-item:nth-child(1).visible { animation-delay: 0ms; }
.contact-item:nth-child(2).visible { animation-delay: 100ms; }
.contact-item:nth-child(3).visible { animation-delay: 200ms; }
.contact-item:nth-child(4).visible { animation-delay: 300ms; }

/* Social link animations */
.social-link {
  opacity: 0;
  transform: scale(0.8);
}

.social-link.visible {
  animation: socialFadeIn 350ms ease-out forwards;
}

@keyframes socialFadeIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Staggered animation delays for social links */
.social-link:nth-child(1).visible { animation-delay: 0ms; }
.social-link:nth-child(2).visible { animation-delay: 100ms; }
.social-link:nth-child(3).visible { animation-delay: 200ms; }

/* Section header animations */
.section-header {
  opacity: 0;
  transform: translateY(15px);
}

.section-header.visible {
  animation: fadeInSlideUp 400ms ease-out forwards;
}

/* Reduced motion preference - disable animations for accessibility */
@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll,
  .education-card,
  .project-card,
  .skill-category,
  .contact-item,
  .social-link,
  .section-header {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
  
  .skill-tag {
    opacity: 1;
    animation: none;
  }
}

/* ========================================
   Mobile Responsiveness
   Requirements: 8.1, 8.3, 8.4
   - Single-column layout for viewport < 768px
   - Minimum 16px font size on mobile
   - Minimum 44x44px touch targets
   ======================================== */

@media (max-width: 767px) {
  /* ---- Base Mobile Styles ---- */
  html {
    font-size: 16px; /* Ensure minimum 16px base font size */
  }

  body {
    font-size: 16px; /* Minimum 16px body text - Requirement 8.3 */
  }

  /* ---- Typography - Ensure minimum 16px ---- */
  .section-subtitle,
  .info-label,
  .meta-label,
  .contact-label,
  .scroll-text,
  .project-section-title {
    font-size: 12px; /* Labels can be smaller as they're supplementary */
  }

  /* All readable text must be at least 16px */
  .hero-description,
  .hero-title,
  .project-description,
  .project-responsibilities li,
  .project-achievements li,
  .info-value,
  .meta-value,
  .contact-value,
  .course-tag,
  .skill-tag,
  .footer p,
  .toast-message span {
    font-size: 16px;
  }

  /* ---- Layout - Single Column ---- */
  .section {
    padding: var(--spacing-12) var(--spacing-4);
  }

  /* Navigation */
  .nav {
    padding: var(--spacing-3) var(--spacing-4);
  }

  .nav-brand {
    font-size: var(--font-size-lg);
  }

  /* Mobile hamburger menu */
  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
  }

  .hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all 0.3s ease;
    margin: 3px 0;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }

  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-primary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-6);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
  }

  .nav-links.mobile-open {
    display: flex;
    opacity: 1;
    visibility: visible;
  }

  .nav-links .nav-link {
    font-size: var(--font-size-xl);
    padding: var(--spacing-3) var(--spacing-6);
  }

  .theme-toggle {
    z-index: 1001;
  }

  /* ---- Hero Section Mobile ---- */
  .hero {
    min-height: calc(100vh - 70px);
    padding-top: var(--spacing-6);
    padding-bottom: var(--spacing-12);
    text-align: center;
  }

  .hero-container {
    grid-template-columns: 1fr; /* Single column */
    gap: var(--spacing-8);
  }

  .hero-content {
    align-items: flex-start;
    text-align: left;
    order: 2;
  }

  .hero-avatar {
    order: 1;
  }

  .avatar-wrapper {
    width: 200px;
    height: 200px;
  }

  /* Hide floating icons on mobile */
  .floating-icon {
    display: none;
  }

  .hero-badge {
    margin: 0 auto;
  }

  .hero-text {
    align-items: center;
  }

  .hero-greeting {
    font-size: var(--font-size-xl);
  }

  .name-english {
    font-size: var(--font-size-3xl);
  }

  .hero-description {
    text-align: center;
    font-size: 16px;
  }

  .hero-cta {
    justify-content: flex-start;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--spacing-3);
  }

  .hero-scroll {
    display: none;
  }

  /* ---- Section Headers Mobile ---- */
  .section-header {
    margin-bottom: var(--spacing-8);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  /* ---- Education Section Mobile ---- */
  .education-card {
    padding: var(--spacing-5);
  }

  .education-main {
    flex-direction: column;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-6);
  }

  .school-name {
    font-size: var(--font-size-xl);
  }

  .school-college {
    font-size: 16px;
  }

  .education-info {
    grid-template-columns: 1fr; /* Single column */
    gap: var(--spacing-3);
  }

  .info-item {
    align-items: flex-start;
  }

  .courses-title {
    font-size: var(--font-size-base);
  }

  .courses-list {
    gap: var(--spacing-2);
  }

  /* ---- Projects Section Mobile ---- */
  .projects-grid {
    grid-template-columns: 1fr; /* Single column */
    gap: var(--spacing-4);
  }

  .project-card {
    padding: var(--spacing-5);
  }

  .project-header {
    flex-direction: column;
    gap: var(--spacing-2);
  }

  .project-title {
    font-size: var(--font-size-lg);
  }

  .project-type {
    align-self: flex-start;
  }

  .project-meta {
    flex-direction: column;
    gap: var(--spacing-2);
  }

  .project-content {
    gap: var(--spacing-4);
  }

  /* ---- Skills Section Mobile ---- */
  .skills-grid {
    grid-template-columns: 1fr; /* Single column */
    gap: var(--spacing-4);
  }

  .skill-category {
    padding: var(--spacing-5);
  }

  .skill-category-title {
    font-size: var(--font-size-base);
  }

  .skill-items {
    gap: var(--spacing-2);
  }

  /* ---- Contact Section Mobile ---- */
  .contact-items {
    flex-direction: column; /* Single column */
    gap: var(--spacing-3);
  }

  .contact-item {
    padding: var(--spacing-4);
    width: 100%;
  }

  .contact-icon {
    width: 44px;
    height: 44px;
  }

  .social-links {
    gap: var(--spacing-3);
  }

  .social-link {
    width: 48px;
    height: 48px;
  }

  /* Toast positioning for mobile */
  .toast {
    bottom: var(--spacing-4);
    left: var(--spacing-4);
    right: var(--spacing-4);
    transform: translateX(0) translateY(100px);
  }

  .toast.visible {
    transform: translateX(0) translateY(0);
  }

  /* ---- Footer Mobile ---- */
  .footer {
    padding: var(--spacing-6) var(--spacing-4);
  }

  .footer p {
    font-size: 16px;
  }

  /* ---- Touch Targets - Minimum 44x44px (Requirement 8.4) ---- */
  /* All interactive elements must have minimum 44x44px touch area */
  
  .btn {
    min-width: 44px;
    min-height: 48px;
    width: 100%;
    max-width: 300px;
    padding: var(--spacing-3) var(--spacing-6);
  }

  .theme-toggle {
    min-width: 44px;
    min-height: 44px;
    width: 44px;
    height: 44px;
  }

  .nav-link {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .course-tag {
    min-height: 44px;
    min-width: 44px;
    padding: var(--spacing-2) var(--spacing-4);
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .skill-tag {
    min-height: 44px;
    min-width: 44px;
    padding: var(--spacing-2) var(--spacing-4);
  }

  .contact-item {
    min-height: 44px;
  }

  .contact-copy-btn {
    min-width: 44px;
    min-height: 44px;
    width: 44px;
    height: 44px;
  }

  .social-link {
    min-width: 44px;
    min-height: 44px;
  }

  /* Project card touch targets */
  .project-card {
    min-height: 44px;
  }

  .project-responsibilities li,
  .project-achievements li {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding-top: var(--spacing-2);
    padding-bottom: var(--spacing-2);
  }

  /* Generic link and button touch targets */
  a:not(.btn):not(.nav-link):not(.social-link) {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }

  button:not(.btn):not(.theme-toggle):not(.contact-copy-btn) {
    min-width: 44px;
    min-height: 44px;
  }
}

/* ---- Extra Small Devices (< 480px) ---- */
@media (max-width: 479px) {
  .section {
    padding: var(--spacing-8) var(--spacing-3);
  }

  .nav {
    padding: var(--spacing-3);
  }

  .hero-greeting {
    font-size: var(--font-size-lg);
  }

  .name-english {
    font-size: var(--font-size-2xl);
  }

  .section-title {
    font-size: var(--font-size-xl);
  }

  .avatar-wrapper {
    width: 160px;
    height: 160px;
  }

  .education-card,
  .project-card,
  .skill-category {
    padding: var(--spacing-4);
  }

  .btn {
    max-width: 100%;
  }

  .contact-item {
    padding: var(--spacing-3);
  }

  .contact-info {
    min-width: 0;
  }

  .contact-value {
    font-size: 14px; /* Allow slightly smaller for very long values */
    word-break: break-word;
  }
}

/* ========================================
   CTA Section
   ======================================== */

.cta-section {
  background-color: var(--color-accent);
  padding: var(--spacing-16) var(--spacing-6);
  text-align: center;
  position: relative;
  overflow: visible;
  max-width: none;
  width: 100%;
  margin-left: 0;
}

.cta-section.section {
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

[data-theme="dark"] .cta-section {
  background-color: #1a1a2e;
}

.cta-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

.cta-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: var(--spacing-4);
}

.cta-description {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--spacing-8);
  line-height: 1.7;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-accent);
  background-color: #ffffff;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
}

[data-theme="dark"] .btn-cta {
  color: var(--color-accent);
  background-color: #ffffff;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  color: var(--color-accent);
}

[data-theme="dark"] .btn-cta:hover {
  color: var(--color-accent);
}

.cta-decoration {
  display: none;
}

/* ========================================
   New Site Footer
   ======================================== */

.site-footer {
  background-color: #0f0f14;
  color: #a0a0b0;
  padding: var(--spacing-16) var(--spacing-6) var(--spacing-8);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
  padding-bottom: var(--spacing-8);
  border-bottom: 1px solid #2a2a3a;
}

@media (min-width: 768px) {
  .footer-container {
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-12);
  }
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-4);
}

.footer-logo .brand-first {
  color: #f0f0f5;
}

.footer-logo .brand-last {
  color: #60a5fa;
}

.footer-tagline {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: #a0a0b0;
}

.footer-status {
  font-size: var(--font-size-sm);
  color: #a0a0b0;
  margin-top: var(--spacing-2);
  line-height: 1.5;
}

.footer-nav-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: #f0f0f5;
  margin-bottom: var(--spacing-4);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.footer-nav-list a {
  color: #a0a0b0;
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
  color: #60a5fa;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.footer-contact-list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--font-size-sm);
  color: #a0a0b0;
}

.footer-contact-list svg {
  flex-shrink: 0;
  color: #60a5fa;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: var(--spacing-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-4);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: #6b6b7b;
}

.footer-copyright .heart {
  color: #ef4444;
}

.footer-social {
  display: flex;
  gap: var(--spacing-4);
}

.footer-social a {
  color: #6b6b7b;
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: #f0f0f5;
}

/* Section More Button */
.section-more {
  text-align: center;
  margin-top: var(--spacing-8);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-accent);
  background: transparent;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Mobile CTA Section */
@media (max-width: 767px) {
  .cta-section {
    padding: var(--spacing-12) 0;
  }

  .cta-content {
    padding: 0 var(--spacing-4);
  }

  .cta-title {
    font-size: var(--font-size-2xl);
  }

  .cta-description {
    font-size: var(--font-size-base);
  }

  .cta-decoration {
    display: none;
  }

  .site-footer {
    padding: var(--spacing-12) var(--spacing-4) var(--spacing-6);
  }

  .footer-container {
    text-align: center;
  }

  .footer-brand {
    max-width: none;
  }
}

/* ========================================
   Enhanced Interactive Animations
   ======================================== */

/* --- Ripple Click Effect --- */
.ripple-container {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  animation: rippleAnimation 0.6s linear;
  pointer-events: none;
}

@keyframes rippleAnimation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Dark theme ripple */
[data-theme="dark"] .ripple {
  background: rgba(96, 165, 250, 0.3);
}

/* --- Magnetic Button Effect --- */
.magnetic-btn {
  transition: transform 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}

.magnetic-btn.magnetic-active {
  transition: transform 0.1s ease-out;
}

/* --- 3D Card Tilt Effect --- */
.tilt-card {
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out, box-shadow 0.3s ease;
  will-change: transform;
}

.tilt-card:hover {
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.25),
    0 0 30px rgba(59, 130, 246, 0.1);
}

.tilt-card .tilt-content {
  transform: translateZ(20px);
  transition: transform 0.3s ease;
}

/* --- Glow Effect on Hover --- */
.glow-hover {
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.glow-hover:hover {
  box-shadow: 
    0 0 20px rgba(59, 130, 246, 0.3),
    0 0 40px rgba(59, 130, 246, 0.15),
    0 0 60px rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] .glow-hover:hover {
  box-shadow: 
    0 0 20px rgba(96, 165, 250, 0.4),
    0 0 40px rgba(96, 165, 250, 0.2),
    0 0 60px rgba(96, 165, 250, 0.1);
}

/* --- Typewriter Effect --- */
.typewriter {
  overflow: hidden;
  border-right: 2px solid var(--color-accent);
  white-space: nowrap;
  animation: 
    typewriter 3s steps(40, end),
    blinkCursor 0.75s step-end infinite;
}

@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blinkCursor {
  from, to { border-color: transparent; }
  50% { border-color: var(--color-accent); }
}

.typewriter-complete {
  border-right: none;
  animation: none;
  width: 100%;
}

/* --- Enhanced Hover Effects --- */
.hover-lift {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.hover-scale {
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-rotate {
  transition: transform 0.3s ease;
}

.hover-rotate:hover {
  transform: rotate(5deg);
}

/* --- Click Feedback Animation --- */
.click-feedback {
  transition: transform 0.1s ease;
}

.click-feedback:active {
  transform: scale(0.95);
}

/* --- Pulse Animation --- */
.pulse-animation {
  animation: pulseEffect 2s ease-in-out infinite;
}

@keyframes pulseEffect {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
  }
}

/* --- Shake Animation (for errors/attention) --- */
.shake-animation {
  animation: shakeEffect 0.5s ease-in-out;
}

@keyframes shakeEffect {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* --- Bounce Animation --- */
.bounce-animation {
  animation: bounceEffect 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes bounceEffect {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.05); }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}

/* --- Parallax Container --- */
.parallax-container {
  position: relative;
  overflow: hidden;
}

.parallax-layer {
  position: absolute;
  will-change: transform;
  transition: transform 0.1s ease-out;
}

.parallax-slow {
  --parallax-speed: 0.3;
}

.parallax-medium {
  --parallax-speed: 0.5;
}

.parallax-fast {
  --parallax-speed: 0.8;
}

/* --- Floating Animation --- */
.float-animation {
  animation: floatEffect 3s ease-in-out infinite;
}

@keyframes floatEffect {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-animation-delayed {
  animation: floatEffect 3s ease-in-out infinite;
  animation-delay: 1s;
}

/* --- Gradient Border Animation --- */
.gradient-border {
  position: relative;
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-lg) + 2px);
  background: rgba(147, 197, 253, 0.6);
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

[data-theme="dark"] .gradient-border::before {
  background: rgba(147, 197, 253, 0.4);
}

.gradient-border:hover::before {
  opacity: 1;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* --- Text Shimmer Effect --- */
.text-shimmer {
  background: linear-gradient(
    90deg,
    var(--color-text-primary) 0%,
    var(--color-accent) 50%,
    var(--color-text-primary) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmerEffect 3s linear infinite;
}

@keyframes shimmerEffect {
  to { background-position: 200% center; }
}

/* --- Icon Spin on Hover --- */
.icon-spin-hover svg {
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.icon-spin-hover:hover svg {
  transform: rotate(360deg);
}

/* --- Underline Animation --- */
.underline-animation {
  position: relative;
}

.underline-animation::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.underline-animation:hover::after {
  width: 100%;
}

/* --- Stagger Children Animation --- */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
}

.stagger-children.visible > * {
  animation: staggerFadeIn 0.4s ease-out forwards;
}

.stagger-children.visible > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children.visible > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children.visible > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children.visible > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children.visible > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children.visible > *:nth-child(6) { animation-delay: 250ms; }
.stagger-children.visible > *:nth-child(7) { animation-delay: 300ms; }
.stagger-children.visible > *:nth-child(8) { animation-delay: 350ms; }

@keyframes staggerFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Morphing Shape Background --- */
.morph-bg {
  position: relative;
}

.morph-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at center,
    rgba(59, 130, 246, 0.1) 0%,
    transparent 70%
  );
  animation: morphBg 15s ease-in-out infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes morphBg {
  0%, 100% {
    transform: translate(0, 0) rotate(0deg) scale(1);
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
  }
  25% {
    transform: translate(5%, 5%) rotate(90deg) scale(1.1);
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  }
  50% {
    transform: translate(-5%, 5%) rotate(180deg) scale(1);
    border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
  }
  75% {
    transform: translate(5%, -5%) rotate(270deg) scale(0.9);
    border-radius: 70% 30% 50% 50% / 30% 30% 70% 70%;
  }
}

/* --- Cursor Trail Effect (requires JS) --- */
.cursor-trail {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.3;
  pointer-events: none;
  z-index: 9999;
  transition: transform 0.1s ease, opacity 0.3s ease;
  mix-blend-mode: screen;
}

/* --- Button Press Effect --- */
.btn-press {
  position: relative;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn-press::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.1s ease;
}

.btn-press:active {
  transform: translateY(2px);
}

.btn-press:active::before {
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.2);
}

/* --- Card Flip Effect --- */
.flip-card {
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
}

.flip-card-back {
  transform: rotateY(180deg);
}

/* --- Elastic Scale --- */
.elastic-scale {
  transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.elastic-scale:hover {
  transform: scale(1.1);
}

.elastic-scale:active {
  transform: scale(0.95);
}

/* --- Neon Glow Text --- */
.neon-text {
  text-shadow: 
    0 0 5px var(--color-accent),
    0 0 10px var(--color-accent),
    0 0 20px var(--color-accent),
    0 0 40px var(--color-accent);
  animation: neonPulse 1.5s ease-in-out infinite alternate;
}

@keyframes neonPulse {
  from {
    text-shadow: 
      0 0 5px var(--color-accent),
      0 0 10px var(--color-accent),
      0 0 20px var(--color-accent),
      0 0 40px var(--color-accent);
  }
  to {
    text-shadow: 
      0 0 2px var(--color-accent),
      0 0 5px var(--color-accent),
      0 0 10px var(--color-accent),
      0 0 20px var(--color-accent);
  }
}

/* --- Progress Bar Animation --- */
.progress-bar {
  height: 4px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), #f093fb);
  border-radius: var(--radius-full);
  transform-origin: left;
  animation: progressFill 1.5s ease-out forwards;
}

@keyframes progressFill {
  from { transform: scaleX(0); }
  to { transform: scaleX(var(--progress, 1)); }
}

/* --- Slide In Animations --- */
.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
}

.slide-in-left.visible {
  animation: slideInLeft 0.5s ease-out forwards;
}

@keyframes slideInLeft {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
}

.slide-in-right.visible {
  animation: slideInRight 0.5s ease-out forwards;
}

@keyframes slideInRight {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* --- Zoom In Animation --- */
.zoom-in {
  opacity: 0;
  transform: scale(0.8);
}

.zoom-in.visible {
  animation: zoomIn 0.4s ease-out forwards;
}

@keyframes zoomIn {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* --- Rotate In Animation --- */
.rotate-in {
  opacity: 0;
  transform: rotate(-10deg) scale(0.9);
}

.rotate-in.visible {
  animation: rotateIn 0.5s ease-out forwards;
}

@keyframes rotateIn {
  to {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
}

/* --- Apply animations to existing elements --- */

/* Enhanced button hover */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

/* Enhanced nav link hover */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
  left: 0;
}

/* Enhanced floating icons */
.floating-icon {
  cursor: pointer;
}

.floating-icon:hover {
  animation: none;
  transform: scale(1.2) rotate(10deg);
}

/* Enhanced skill tags */
.skill-tag {
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.skill-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

.skill-tag:hover::before {
  left: 100%;
}

/* Enhanced social links */
.social-link {
  position: relative;
}

.social-link::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--color-accent);
  transform: scale(0);
  transition: transform 0.3s ease;
  z-index: -1;
}

.social-link:hover::before {
  transform: scale(1);
}

/* Enhanced contact items */
.contact-item {
  position: relative;
  overflow: hidden;
}

.contact-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(59, 130, 246, 0.1),
    transparent
  );
  transition: left 0.6s ease;
}

.contact-item:hover::before {
  left: 100%;
}

/* Enhanced theme toggle */
.theme-toggle {
  position: relative;
  overflow: hidden;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--color-accent);
  transform: scale(0);
  transition: transform 0.3s ease;
  opacity: 0.1;
}

.theme-toggle:hover::before {
  transform: scale(1);
}

.theme-toggle:active .theme-icon {
  transform: scale(0.8) rotate(180deg);
}

/* Reduced motion - disable all enhanced animations */
@media (prefers-reduced-motion: reduce) {
  .ripple,
  .magnetic-btn,
  .tilt-card,
  .glow-hover,
  .typewriter,
  .hover-lift,
  .hover-scale,
  .hover-rotate,
  .click-feedback,
  .pulse-animation,
  .shake-animation,
  .bounce-animation,
  .float-animation,
  .gradient-border::before,
  .text-shimmer,
  .icon-spin-hover svg,
  .underline-animation::after,
  .stagger-children > *,
  .morph-bg::before,
  .btn-press,
  .elastic-scale,
  .neon-text,
  .progress-bar-fill,
  .slide-in-left,
  .slide-in-right,
  .zoom-in,
  .rotate-in,
  .btn::before,
  .nav-link::after,
  .skill-tag::before,
  .social-link::before,
  .contact-item::before,
  .theme-toggle::before {
    animation: none !important;
    transition: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}

/* ========================================
   University Experience Section
   大学经历页面样式
   ======================================== */

.university-section {
  margin-bottom: var(--spacing-12);
}

.university-section:last-child {
  margin-bottom: 0;
}

.university-section-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-6);
  padding-bottom: var(--spacing-3);
  border-bottom: 2px solid var(--color-accent);
}

.section-icon {
  font-size: var(--font-size-2xl);
}

/* Awards Grid */
.awards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-4);
}

.award-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  padding: var(--spacing-5);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast),
              background-color var(--transition-theme);
  opacity: 0;
  transform: translateY(20px);
}

.award-card.visible {
  animation: fadeInSlideUp 400ms ease-out forwards;
}

.award-card:nth-child(1).visible { animation-delay: 0ms; }
.award-card:nth-child(2).visible { animation-delay: 100ms; }
.award-card:nth-child(3).visible { animation-delay: 200ms; }

.award-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.award-icon {
  font-size: var(--font-size-3xl);
  flex-shrink: 0;
}

.award-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.award-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
}

.award-level {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-accent);
}

.award-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--spacing-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-8);
  opacity: 0;
  transform: translateX(-20px);
}

.timeline-item.visible {
  animation: timelineSlideIn 400ms ease-out forwards;
}

.timeline-item:nth-child(1).visible { animation-delay: 0ms; }
.timeline-item:nth-child(2).visible { animation-delay: 150ms; }
.timeline-item:nth-child(3).visible { animation-delay: 300ms; }

@keyframes timelineSlideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--spacing-8) + 4px);
  top: 4px;
  width: 12px;
  height: 12px;
  background-color: var(--color-accent);
  border: 3px solid var(--color-bg-primary);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 3px var(--color-accent);
  transition: background-color var(--transition-theme),
              border-color var(--transition-theme);
}

.timeline-content {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-theme),
              border-color var(--transition-theme);
}

.timeline-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin-bottom: var(--spacing-3);
}

.timeline-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

.timeline-date {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.timeline-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-4);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.timeline-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast),
              color var(--transition-fast);
}

.timeline-tag:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Growth Grid */
.growth-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-4);
}

.growth-card {
  padding: var(--spacing-6);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              background-color var(--transition-theme),
              border-color var(--transition-theme);
  opacity: 0;
  transform: translateY(20px);
}

.growth-card.visible {
  animation: fadeInSlideUp 400ms ease-out forwards;
}

.growth-card:nth-child(1).visible { animation-delay: 0ms; }
.growth-card:nth-child(2).visible { animation-delay: 100ms; }
.growth-card:nth-child(3).visible { animation-delay: 200ms; }
.growth-card:nth-child(4).visible { animation-delay: 300ms; }

.growth-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.growth-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-4);
}

.growth-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
}

.growth-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* University Section - Desktop Enhancement */
@media (min-width: 768px) {
  .awards-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .timeline-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .growth-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .growth-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* University Section - Mobile */
@media (max-width: 767px) {
  .university-section-title {
    font-size: var(--font-size-lg);
  }

  .section-icon {
    font-size: var(--font-size-xl);
  }

  .award-card {
    padding: var(--spacing-4);
  }

  .award-title {
    font-size: 16px;
  }

  .timeline {
    padding-left: var(--spacing-6);
  }

  .timeline-marker {
    left: calc(-1 * var(--spacing-6) + 4px);
  }

  .timeline-content {
    padding: var(--spacing-4);
  }

  .timeline-title {
    font-size: var(--font-size-base);
  }

  .timeline-description {
    font-size: 16px;
  }

  .growth-card {
    padding: var(--spacing-5);
  }

  .growth-description {
    font-size: 16px;
  }

  .timeline-tag {
    min-height: 44px;
    padding: var(--spacing-2) var(--spacing-3);
    display: inline-flex;
    align-items: center;
  }
}

/* Reduced motion for university section */
@media (prefers-reduced-motion: reduce) {
  .award-card,
  .timeline-item,
  .growth-card {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* ========================================
   Mobile Hamburger Menu (Desktop Hidden)
   ======================================== */

/* Mobile menu toggle - show on mobile, hide on desktop */
@media (max-width: 767px) {
  .mobile-menu-toggle {
    display: flex !important;
  }
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none !important;
  }
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 48px;
  height: 48px;
  background-color: var(--color-accent);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-text-primary);
  transform: translateY(-4px);
}

@media (max-width: 767px) {
  .back-to-top {
    bottom: var(--spacing-4);
    right: var(--spacing-4);
    width: 44px;
    height: 44px;
  }
}

/* ========================================
   Download Resume Button
   ======================================== */

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: #ffffff;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 48px;
  box-shadow: var(--shadow-md);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #ffffff;
}

.btn-download svg {
  width: 20px;
  height: 20px;
}

/* Contact Button Style */
.btn-contact {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: #ffffff;
  background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 48px;
  box-shadow: var(--shadow-md);
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #ffffff;
  background: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
}

/* ========================================
   Skill Progress Bars
   ======================================== */

.skill-with-progress {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  padding: var(--spacing-3);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-theme);
}

.skill-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-progress-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.skill-progress-percent {
  font-size: var(--font-size-xs);
  color: var(--color-accent);
  font-weight: 600;
}

.skill-progress-bar {
  height: 6px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), #8b5cf6);
  border-radius: var(--radius-full);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 1s ease-out;
}

.skill-category.visible .skill-progress-fill {
  transform: scaleX(var(--progress, 0));
}

/* ========================================
   Project Image Preview
   ======================================== */

.project-image {
  width: 100%;
  height: 180px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  overflow: hidden;
  position: relative;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  color: var(--color-text-secondary);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-border) 100%);
}

.project-image-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

.project-image-placeholder span {
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

/* Project Tech Stack Tags */
.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

[data-theme="dark"] .tech-tag {
  background-color: rgba(96, 165, 250, 0.15);
}

.tech-tag:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* ========================================
   Badge Style for Awards
   ======================================== */

.badge-award {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: #1a1a2e;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
}

.badge-award.silver {
  background: linear-gradient(135deg, #e5e7eb 0%, #9ca3af 100%);
}

.badge-award.bronze {
  background: linear-gradient(135deg, #fcd34d 0%, #b45309 100%);
}

/* Contact Download Section */
.contact-download {
  margin-bottom: var(--spacing-6);
}

.contact-download .btn-download {
  padding: var(--spacing-3) var(--spacing-6);
}

/* Contact page spacing fix */
.contact .section-header {
  margin-bottom: var(--spacing-4);
}

.contact .contact-intro {
  margin-bottom: var(--spacing-2);
}

.contact .contact-container {
  gap: var(--spacing-6);
}

.contact .contact-download {
  margin-bottom: 0;
}

/* ========================================
   Enhanced Animations - Part 1
   ======================================== */

/* Typewriter cursor effect */
.typewriter-cursor::after {
  content: '|';
  animation: blink 1s infinite;
  color: var(--color-accent);
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.typewriter-complete::after {
  display: none;
}

/* Number counter animation */
.count-up {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* Mouse follow glow effect */
.mouse-glow {
  position: fixed;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
  opacity: 0;
}

.mouse-glow.active {
  opacity: 1;
}

[data-theme="dark"] .mouse-glow {
  background: radial-gradient(circle, rgba(96, 165, 250, 0.1) 0%, transparent 70%);
}

/* Page transition effect */
.page-transition {
  animation: pageIn 0.5s ease-out;
}

@keyframes pageIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Timeline animation */
.timeline-item {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item:nth-child(even) {
  transform: translateX(30px);
}

.timeline-item:nth-child(even).visible {
  transform: translateX(0);
}

/* Staggered timeline animation */
.timeline-item:nth-child(1) { transition-delay: 0.1s; }
.timeline-item:nth-child(2) { transition-delay: 0.2s; }
.timeline-item:nth-child(3) { transition-delay: 0.3s; }
.timeline-item:nth-child(4) { transition-delay: 0.4s; }
.timeline-item:nth-child(5) { transition-delay: 0.5s; }

/* Enhanced card hover with 3D effect */
.card-3d {
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
}

.card-3d:hover {
  transform: perspective(1000px) rotateX(2deg) rotateY(2deg) translateZ(10px);
}

/* Gradient border animation */
.gradient-border-animated {
  position: relative;
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
}

.gradient-border-animated::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-lg) + 2px);
  background: linear-gradient(45deg, var(--color-accent), #8b5cf6, #ec4899, var(--color-accent));
  background-size: 300% 300%;
  animation: gradientMove 3s ease infinite;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.gradient-border-animated:hover::before {
  opacity: 1;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Floating animation enhancement */
.float-enhanced {
  animation: floatEnhanced 6s ease-in-out infinite;
}

@keyframes floatEnhanced {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-10px) rotate(2deg);
  }
  50% {
    transform: translateY(-5px) rotate(0deg);
  }
  75% {
    transform: translateY(-15px) rotate(-2deg);
  }
}

/* Pulse glow effect */
.pulse-glow {
  animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 5px var(--color-accent), 0 0 10px var(--color-accent);
  }
  50% {
    box-shadow: 0 0 20px var(--color-accent), 0 0 30px var(--color-accent);
  }
}

/* Text shimmer effect */
.text-shimmer {
  background: linear-gradient(
    90deg,
    var(--color-text-primary) 0%,
    var(--color-accent) 50%,
    var(--color-text-primary) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
  to {
    background-position: 200% center;
  }
}

/* Skill tag hover effect */
.skill-tag {
  position: relative;
  overflow: hidden;
}

.skill-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.skill-tag:hover::before {
  left: 100%;
}

/* Back to top button enhanced */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-accent);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: all 0.3s ease;
  z-index: 999;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.back-to-top:active {
  transform: translateY(0) scale(0.95);
}

/* Theme toggle animation */
.theme-toggle {
  position: relative;
  overflow: hidden;
}

.theme-toggle .theme-icon {
  transition: transform 0.5s ease;
}

.theme-toggle:hover .theme-icon {
  transform: rotate(180deg);
}

/* Award card shine effect */
.award-card {
  position: relative;
  overflow: hidden;
}

.award-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 70%
  );
  transform: rotate(45deg) translateX(-100%);
  transition: transform 0.6s ease;
}

.award-card:hover::after {
  transform: rotate(45deg) translateX(100%);
}

/* Loading skeleton animation */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 25%,
    var(--color-border) 50%,
    var(--color-bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton 1.5s ease-in-out infinite;
}

@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Ripple effect */
.ripple-container {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Hero section enhanced animations */
.hero-name {
  animation: heroNameIn 1s ease-out;
}

@keyframes heroNameIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.9);
    filter: blur(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.hero-badge {
  animation: badgeBounce 0.8s ease-out 0.3s both;
}

@keyframes badgeBounce {
  0% {
    opacity: 0;
    transform: translateY(-20px);
  }
  60% {
    transform: translateY(5px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* CTA buttons stagger animation */
.hero-cta .btn:nth-child(1) { animation-delay: 0.5s; }
.hero-cta .btn:nth-child(2) { animation-delay: 0.6s; }
.hero-cta .btn:nth-child(3) { animation-delay: 0.7s; }

.hero-cta .btn {
  animation: ctaIn 0.6s ease-out both;
}

@keyframes ctaIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), #8b5cf6, #ec4899);
  z-index: 1001;
  transition: width 0.1s ease;
}

/* Section reveal animation */
.section:not(.hero) {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.section:not(.hero).visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hero section should always be visible */
.section.hero {
  opacity: 1;
  transform: none;
}

/* Project card flip effect on mobile tap */
@media (hover: none) {
  .project-card:active {
    transform: scale(0.98);
  }
}

/* Cursor trail (desktop only) */
.cursor-trail {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
}

/* Smooth theme transition */
* {
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Disable animations for reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .scroll-progress,
  .cursor-trail,
  .mouse-glow {
    display: none !important;
  }
}

/* ========================================
   Hero DateTime Display
   ======================================== */

.hero-datetime {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-2);
  margin: var(--spacing-4) 0;
  padding: var(--spacing-3) var(--spacing-4);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  animation: datetimeIn 0.8s ease-out 0.2s both;
}

[data-theme="dark"] .hero-datetime {
  background: rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.1);
}

@keyframes datetimeIn {
  from {
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.datetime-date {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.datetime-weekday {
  padding: var(--spacing-1) var(--spacing-2);
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: var(--font-size-xs);
}

.datetime-full {
  letter-spacing: 0.5px;
}

.datetime-time {
  display: flex;
  align-items: center;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 2px;
}

.datetime-time span {
  display: inline-block;
}

.time-separator {
  animation: blink 1s step-end infinite;
  margin: 0 2px;
  color: var(--color-accent);
}

.time-hours,
.time-minutes,
.time-seconds {
  min-width: 2ch;
  text-align: center;
  transition: transform 0.3s ease;
}

.time-seconds {
  color: var(--color-accent);
  font-size: var(--font-size-xl);
}

/* Hover effect */
.hero-datetime:hover .time-hours,
.hero-datetime:hover .time-minutes {
  transform: scale(1.05);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-datetime {
    padding: var(--spacing-3) var(--spacing-4);
    align-items: center;
  }
  
  .datetime-time {
    font-size: var(--font-size-2xl);
  }
  
  .time-seconds {
    font-size: var(--font-size-xl);
  }
  
  .datetime-date {
    flex-direction: column;
    gap: var(--spacing-1);
    text-align: center;
  }
}

/* ========================================
   Mobile Enhancements - Additional Fixes
   确保移动端所有内容和动画正常显示
   ======================================== */

@media (max-width: 767px) {
  /* Hero Section Mobile Enhancements */
  .hero {
    overflow-x: hidden;
  }

  .hero-content {
    text-align: center;
    align-items: center;
  }

  .hero-badge {
    margin: 0 auto var(--spacing-4);
  }

  .hero-text {
    text-align: center;
    align-items: center;
  }

  .hero-greeting {
    text-align: center;
  }

  .hero-name-chinese {
    text-align: center;
  }

  .hero-title {
    text-align: center;
    font-size: 15px;
    line-height: 1.6;
  }

  .hero-description {
    text-align: center;
    font-size: 15px;
    line-height: 1.7;
    padding: 0 var(--spacing-2);
  }

  .hero-cta {
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* DateTime Mobile */
  .hero-datetime {
    width: 100%;
    max-width: 280px;
    margin: var(--spacing-4) auto;
    text-align: center;
  }

  /* Avatar Mobile */
  .hero-avatar {
    padding: var(--spacing-4);
  }

  .avatar-wrapper {
    margin: 0 auto;
  }

  .avatar-image {
    inset: 15px;
  }

  /* Project Cards Mobile */
  .project-card {
    margin-bottom: var(--spacing-2);
  }

  .project-image {
    height: 140px;
  }

  .project-tech-stack {
    justify-content: center;
  }

  .tech-tag {
    font-size: 12px;
    padding: var(--spacing-1) var(--spacing-2);
  }

  /* CTA Section Mobile */
  .cta-section {
    padding: var(--spacing-10) var(--spacing-4);
  }

  .cta-title {
    font-size: var(--font-size-xl);
    line-height: 1.4;
  }

  .cta-description {
    font-size: 15px;
    line-height: 1.6;
  }

  .btn-cta {
    width: 100%;
    max-width: 280px;
  }

  /* Footer Mobile */
  .site-footer {
    text-align: center;
  }

  .footer-container {
    gap: var(--spacing-8);
  }

  .footer-brand {
    margin: 0 auto;
  }

  .footer-nav,
  .footer-contact {
    text-align: center;
  }

  .footer-nav-list,
  .footer-contact-list {
    align-items: center;
  }

  .footer-contact-list li {
    justify-content: center;
    flex-wrap: wrap;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-4);
  }

  .footer-social {
    justify-content: center;
  }

  /* Section More Button Mobile */
  .section-more {
    margin-top: var(--spacing-6);
  }

  .btn-outline {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* Disable complex animations on mobile for performance */
  .morph-bg::before {
    display: none;
  }

  .mouse-glow {
    display: none;
  }

  .cursor-trail {
    display: none;
  }

  /* Simplify 3D effects on mobile */
  .tilt-card {
    transform: none !important;
  }

  .tilt-card:hover {
    transform: translateY(-4px) !important;
  }

  /* Ensure animations still work but are simpler */
  .parallax-layer {
    transform: none !important;
  }

  /* Contact Items Mobile Grid */
  .contact-items {
    grid-template-columns: 1fr;
  }

  /* Skills Grid Mobile */
  .skill-category:last-child {
    grid-column: auto;
  }

  /* Skill Progress Bars Mobile */
  .skill-with-progress {
    padding: var(--spacing-2);
  }

  .skill-progress-name {
    font-size: 14px;
  }

  .skill-progress-percent {
    font-size: 12px;
  }

  .skill-progress-bar {
    height: 5px;
  }

  /* Ensure progress bar animation works on mobile */
  .skill-category.visible .skill-progress-fill {
    transform: scaleX(var(--progress, 0));
    transition: transform 0.8s ease-out;
  }

  /* University Section Mobile */
  .awards-grid {
    grid-template-columns: 1fr;
  }

  .growth-grid {
    grid-template-columns: 1fr;
  }

  /* Timeline Mobile */
  .timeline {
    padding-left: var(--spacing-6);
  }

  .timeline::before {
    left: 6px;
  }

  .timeline-marker {
    left: calc(-1 * var(--spacing-6) + 2px);
    width: 10px;
    height: 10px;
  }

  /* Ensure visible class works on mobile */
  .animate-on-scroll.visible,
  .education-card.visible,
  .project-card.visible,
  .skill-category.visible,
  .contact-item.visible,
  .social-link.visible,
  .section-header.visible,
  .award-card.visible,
  .timeline-item.visible,
  .growth-card.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Skill tags animation on mobile */
  .skill-category.visible .skill-tag {
    opacity: 1;
    transform: scale(1);
  }
}

/* Extra Small Devices Additional Fixes */
@media (max-width: 479px) {
  .hero-badge {
    padding: var(--spacing-2) var(--spacing-3);
  }

  .badge-text {
    font-size: 12px;
  }

  .hero-datetime {
    padding: var(--spacing-2) var(--spacing-3);
  }

  .datetime-time {
    font-size: var(--font-size-xl);
    letter-spacing: 1px;
  }

  .time-seconds {
    font-size: var(--font-size-lg);
  }

  .hero-title {
    font-size: 14px;
  }

  .hero-description {
    font-size: 14px;
  }

  .project-title {
    font-size: var(--font-size-base);
  }

  .project-description {
    font-size: 14px;
  }

  .cta-title {
    font-size: var(--font-size-lg);
  }

  .footer-logo {
    font-size: var(--font-size-lg);
  }

  .footer-tagline {
    font-size: 14px;
  }

  .footer-status {
    font-size: 13px;
  }
}

/* Landscape Mobile Orientation */
@media (max-width: 767px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: var(--spacing-8) 0;
  }

  .hero-container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-6);
  }

  .hero-content {
    order: 1;
    text-align: left;
    align-items: flex-start;
  }

  .hero-avatar {
    order: 2;
  }

  .avatar-wrapper {
    width: 180px;
    height: 180px;
  }

  .hero-cta {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .hero-cta .btn {
    width: auto;
    max-width: none;
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover-dependent animations on touch devices */
  .btn::before {
    display: none;
  }

  .skill-tag::before {
    display: none;
  }

  .social-link::before {
    display: none;
  }

  .contact-item::before {
    display: none;
  }

  .gradient-border::before {
    display: none;
  }

  .gradient-border-animated::before {
    display: none;
  }

  /* Simplify hover states */
  .project-card:hover {
    transform: none;
  }

  .skill-tag:hover {
    transform: none;
  }

  .contact-item:hover {
    transform: none;
  }

  /* Keep active states for touch feedback */
  .btn:active {
    transform: scale(0.98);
  }

  .skill-tag:active {
    background-color: var(--color-accent);
    color: #ffffff;
  }

  .contact-item:active {
    border-color: var(--color-accent);
  }

  .project-card:active {
    border-color: var(--color-accent);
  }
}

/* Safe Area Insets for notched devices */
@supports (padding: max(0px)) {
  .header {
    padding-left: max(var(--spacing-4), env(safe-area-inset-left));
    padding-right: max(var(--spacing-4), env(safe-area-inset-right));
  }

  .nav {
    padding-left: max(var(--spacing-4), env(safe-area-inset-left));
    padding-right: max(var(--spacing-4), env(safe-area-inset-right));
  }

  .section {
    padding-left: max(var(--spacing-4), env(safe-area-inset-left));
    padding-right: max(var(--spacing-4), env(safe-area-inset-right));
  }

  .site-footer {
    padding-bottom: max(var(--spacing-6), env(safe-area-inset-bottom));
  }

  .back-to-top {
    bottom: max(var(--spacing-4), calc(env(safe-area-inset-bottom) + var(--spacing-4)));
    right: max(var(--spacing-4), env(safe-area-inset-right));
  }

  .toast {
    bottom: max(var(--spacing-4), calc(env(safe-area-inset-bottom) + var(--spacing-4)));
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid currentColor;
  }

  .skill-tag {
    border: 1px solid var(--color-border);
  }

  .project-card {
    border-width: 2px;
  }

  .contact-item {
    border-width: 2px;
  }
}

/* ========================================
   Mobile Bottom Navigation Bar
   ======================================== */

.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
  z-index: 100;
  padding: var(--spacing-2) 0;
  padding-bottom: max(var(--spacing-2), env(safe-area-inset-bottom));
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

[data-theme="dark"] .mobile-bottom-nav {
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
}

.mobile-bottom-nav-links {
  display: flex;
  justify-content: space-around;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-bottom-nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-1) var(--spacing-2);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 11px;
  font-weight: 500;
  transition: color var(--transition-fast);
  min-width: 50px;
}

.mobile-bottom-nav-link svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.5;
}

.mobile-bottom-nav-link:hover,
.mobile-bottom-nav-link.active {
  color: var(--color-accent);
}

.mobile-bottom-nav-link.active {
  font-weight: 600;
}

/* Show bottom nav only on mobile */
@media (max-width: 767px) {
  .mobile-bottom-nav {
    display: block;
  }

  /* Add padding to main content to prevent overlap with bottom nav */
  body {
    padding-bottom: 70px;
  }

  /* Adjust back-to-top button position */
  .back-to-top {
    bottom: max(80px, calc(env(safe-area-inset-bottom) + 80px));
  }

  /* Adjust toast position */
  .toast {
    bottom: max(80px, calc(env(safe-area-inset-bottom) + 80px));
  }

  /* 首页移动端只显示第一个项目 */
  .hero ~ .projects .projects-grid .project-card:nth-child(n+2) {
    display: none;
  }

  /* 移动端精简Footer */
  .footer-nav {
    display: none;
  }

  .footer-contact {
    display: none;
  }

  .footer-brand {
    text-align: center;
  }

  .footer-brand .footer-status {
    display: none;
  }

  .footer-brand .footer-status:first-of-type,
  .footer-brand .footer-status:nth-of-type(2) {
    display: block;
  }

  .footer-container {
    justify-content: center;
  }

  .footer-tagline {
    font-size: 13px;
  }

  /* ========================================
     移动端全面优化
     ======================================== */

  /* 页面标题优化 */
  .section-title {
    font-size: var(--font-size-2xl);
  }

  .section-subtitle {
    font-size: var(--font-size-xs);
  }

  .section-header {
    margin-bottom: var(--spacing-8);
  }

  /* 教育页面优化 */
  .education-card {
    padding: var(--spacing-4);
  }

  .school-name {
    font-size: var(--font-size-lg);
  }

  .school-college {
    font-size: var(--font-size-sm);
  }

  .education-main {
    padding-bottom: var(--spacing-4);
    margin-bottom: var(--spacing-4);
  }

  .education-info {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3);
  }

  .info-label {
    font-size: 10px;
  }

  .info-value {
    font-size: var(--font-size-sm);
  }

  .courses-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-3);
  }

  .course-tag {
    font-size: 12px;
    padding: var(--spacing-1) var(--spacing-2);
  }

  /* 大学经历页面优化 */
  .university-section {
    margin-bottom: var(--spacing-8);
  }

  .university-section-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-4);
  }

  .award-card {
    padding: var(--spacing-3);
  }

  .award-icon {
    font-size: var(--font-size-lg);
  }

  .award-title {
    font-size: var(--font-size-sm);
    line-height: 1.4;
  }

  .award-level {
    font-size: 12px;
  }

  .award-date {
    font-size: 11px;
  }

  /* 时间线优化 */
  .timeline-content {
    padding: var(--spacing-3);
  }

  .timeline-title {
    font-size: var(--font-size-base);
  }

  .timeline-date {
    font-size: 12px;
  }

  .timeline-description {
    font-size: var(--font-size-sm);
    line-height: 1.6;
  }

  .timeline-tag {
    font-size: 11px;
    padding: 2px 8px;
  }

  /* 成长卡片优化 */
  .growth-card {
    padding: var(--spacing-4);
  }

  .growth-icon {
    font-size: var(--font-size-2xl);
  }

  .growth-title {
    font-size: var(--font-size-base);
  }

  .growth-description {
    font-size: var(--font-size-sm);
    line-height: 1.6;
  }

  /* 项目页面优化 */
  .project-card {
    padding: var(--spacing-4);
  }

  .project-header {
    flex-direction: column;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-3);
  }

  .project-title {
    font-size: var(--font-size-base);
    line-height: 1.4;
  }

  .project-type {
    align-self: flex-start;
  }

  .project-meta {
    gap: var(--spacing-3);
    padding-bottom: var(--spacing-3);
    margin-bottom: var(--spacing-4);
  }

  .project-meta .meta-label {
    font-size: 10px;
  }

  .project-meta .meta-value {
    font-size: 13px;
  }

  .project-section {
    gap: var(--spacing-2);
  }

  .project-section-title {
    font-size: 13px;
  }

  .project-description {
    font-size: var(--font-size-sm);
  }

  .project-responsibilities li,
  .project-achievements li {
    font-size: 13px;
    padding-left: var(--spacing-4);
    line-height: 1.5;
  }

  .project-content {
    gap: var(--spacing-4);
  }

  /* 技能页面优化 */
  .skill-category {
    padding: var(--spacing-4);
  }

  .skill-category-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-2);
  }

  .skill-items {
    gap: var(--spacing-2);
  }

  .skill-tag {
    font-size: 13px;
    padding: var(--spacing-2) var(--spacing-3);
  }

  /* 联系页面优化 */
  .contact-intro {
    font-size: var(--font-size-sm);
    line-height: 1.6;
    padding: 0 var(--spacing-2);
  }

  .contact-download .btn-download {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .contact-item {
    padding: var(--spacing-4);
  }

  .contact-icon {
    width: 48px;
    height: 48px;
  }

  .contact-icon svg {
    width: 20px;
    height: 20px;
  }

  .contact-label {
    font-size: 12px;
  }

  .contact-value {
    font-size: var(--font-size-sm);
  }

  .contact-copy-btn {
    width: 32px;
    height: 32px;
  }

  .social-links {
    gap: var(--spacing-4);
    padding-top: var(--spacing-4);
  }

  .social-link {
    width: 50px;
    height: 50px;
  }

  .social-link svg {
    width: 22px;
    height: 22px;
  }

  /* 页面内容间距优化 */
  .page-section {
    padding-top: var(--spacing-8);
    padding-bottom: var(--spacing-8);
  }

  /* 滚动指示器隐藏 */
  .hero-scroll {
    display: none;
  }
}