:root {
  /* MD3 Expressive Color System - Purple Gradient Theme */
  --md-primary: #667eea;
  --md-primary-rgb: 102, 126, 234;
  --md-primary-dark: #764ba2;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #e8eaf6;
  --md-on-primary-container: #1a237e;

  --md-secondary: #f093fb;
  --md-secondary-rgb: 240, 147, 251;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #fce4ec;
  --md-on-secondary-container: #880e4f;

  --md-tertiary: #4facfe;
  --md-tertiary-rgb: 79, 172, 254;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #e1f5fe;
  --md-on-tertiary-container: #01579b;

  --md-error: #BA1A1A;
  --md-on-error: #FFFFFF;
  --md-error-container: #FFDAD6;
  --md-on-error-container: #410002;

  --md-surface: #ffffff;
  --md-on-surface: #1a1a1a;
  --md-surface-variant: #f8f9fa;
  --md-on-surface-variant: #5f6368;
  --md-outline: #dadce0;
  --md-outline-variant: #e8eaed;
  --md-inverse-surface: #313033;
  --md-inverse-on-surface: #F4EFF4;
  --md-inverse-primary: #b39ddb;

  /* Dynamic colors from app icon - Default Purple Gradient */
  --icon-color: #667eea;
  --icon-color-rgb: 102, 126, 234;
  --icon-color-secondary: #764ba2;
  --icon-color-secondary-rgb: 118, 75, 162;
  --icon-color-tertiary: #f093fb;
  --icon-color-tertiary-rgb: 240, 147, 251;

  /* Expressive gradients - Purple Theme */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --md-gradient-primary: linear-gradient(135deg, var(--icon-color, #667eea), var(--md-primary-dark));
  --md-gradient-secondary: linear-gradient(135deg, var(--md-secondary), var(--md-tertiary));
  --md-gradient-hero: linear-gradient(135deg,
    rgba(var(--icon-color-rgb, 102, 126, 234), 0.1) 0%,
    rgba(var(--icon-color-secondary-rgb, 118, 75, 162), 0.05) 50%,
    rgba(var(--icon-color-tertiary-rgb, 240, 147, 251), 0.1) 100%);
  --md-gradient-surface: linear-gradient(180deg,
    rgba(var(--icon-color-rgb, 102, 126, 234), 0.02) 0%,
    transparent 100%);

  /* State layers */
  --md-state-hover: 0.08;
  --md-state-focus: 0.12;
  --md-state-pressed: 0.12;
  --md-state-dragged: 0.16;

  /* Shape system */
  --md-shape-corner-none: 0px;
  --md-shape-corner-extra-small: 4px;
  --md-shape-corner-small: 8px;
  --md-shape-corner-medium: 12px;
  --md-shape-corner-large: 16px;
  --md-shape-corner-extra-large: 24px;
  --md-shape-corner-full: 50%;

  /* 新增圆角变量 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Elevation system - 柔和阴影 */
  --md-elevation-0: none;
  --md-elevation-1: 0 2px 8px rgba(0, 0, 0, 0.04);
  --md-elevation-2: 0 4px 16px rgba(0, 0, 0, 0.08);
  --md-elevation-3: 0 8px 32px rgba(0, 0, 0, 0.12);
  --md-elevation-4: 0 12px 48px rgba(0, 0, 0, 0.16);
  --md-elevation-5: 0 16px 64px rgba(0, 0, 0, 0.20);

  /* 新增阴影变量 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);

  /* Typography system */
  --md-font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --md-font-display-large: 57px;
  --md-font-display-medium: 45px;
  --md-font-display-small: 36px;
  --md-font-headline-large: 32px;
  --md-font-headline-medium: 28px;
  --md-font-headline-small: 24px;
  --md-font-title-large: 22px;
  --md-font-title-medium: 16px;
  --md-font-title-small: 14px;
  --md-font-body-large: 16px;
  --md-font-body-medium: 14px;
  --md-font-body-small: 12px;
  --md-font-label-large: 14px;
  --md-font-label-medium: 12px;
  --md-font-label-small: 11px;

  /* Motion system */
  --md-motion-duration-short1: 50ms;
  --md-motion-duration-short2: 100ms;
  --md-motion-duration-short3: 150ms;
  --md-motion-duration-short4: 200ms;
  --md-motion-duration-medium1: 250ms;
  --md-motion-duration-medium2: 300ms;
  --md-motion-duration-medium3: 350ms;
  --md-motion-duration-medium4: 400ms;
  --md-motion-duration-long1: 450ms;
  --md-motion-duration-long2: 500ms;

  /* 新增过渡变量 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --md-motion-duration-long3: 550ms;
  --md-motion-duration-long4: 600ms;

  --md-motion-easing-linear: cubic-bezier(0, 0, 1, 1);
  --md-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-easing-standard-accelerate: cubic-bezier(0.3, 0, 1, 1);
  --md-motion-easing-standard-decelerate: cubic-bezier(0, 0, 0, 1);
  --md-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
  --md-motion-easing-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
}

/* Base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--md-font-family);
  font-size: var(--md-font-body-medium);
  line-height: 1.5;
  color: var(--md-on-surface);
  background-color: var(--md-surface);
  background-image: var(--md-gradient-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

a {
  color: var(--md-primary);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition: color var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

a:hover {
  color: var(--md-on-surface);
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 16px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}
/* MD3 Top App Bar - 毛玻璃导航栏 */
.md3-top-app-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--md-outline-variant);
  z-index: 1000;
}

@media (prefers-color-scheme: dark) {
  .md3-top-app-bar {
    background: rgba(26, 26, 26, 0.95);
  }
}
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  transition: var(--transition);
}

.md3-top-app-bar-content {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 4px;
  max-width: 1200px;
  margin: 0 auto;
}

.md3-top-app-bar-title {
  flex: 1;
  margin-left: 16px;
}

.app-logo {
  font-size: 20px;
  font-weight: 600;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.5px;
}

.md3-top-app-bar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.md3-icon-button {
  width: 48px;
  height: 48px;
  border-radius: var(--md-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--md-motion-duration-short2) var(--md-motion-easing-standard);
  color: var(--md-on-surface-variant);
}

.md3-icon-button:hover {
  background-color: rgba(var(--md-primary-rgb), var(--md-state-hover));
  color: var(--md-primary);
}

.md3-icon-button:active {
  background-color: rgba(var(--md-primary-rgb), var(--md-state-pressed));
}

/* Icon styles - clean without background */
.md3-icon-button .material-icons,
.md3-icon-button .material-icons-outlined {
  font-size: 24px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: currentColor;
  text-align: center;
  line-height: 1;
}

/* Fallback content for specific icons - clean symbols */
.md3-icon-button .material-icons:empty::before,
.md3-icon-button .material-icons-outlined:empty::before {
  content: "●";
  font-size: 16px;
  color: var(--md-on-surface-variant);
}

/* Specific icon fallbacks */
.md3-icon-button .material-icons[data-icon="arrow_back"]:empty::before {
  content: "←";
  font-size: 18px;
  color: var(--md-on-surface);
}

.md3-icon-button .material-icons[data-icon="share"]:empty::before {
  content: "↗";
  font-size: 16px;
  color: var(--md-on-surface-variant);
}

.md3-icon-button .material-icons-outlined[data-icon="favorite_border"]:empty::before {
  content: "♡";
  font-size: 18px;
  color: var(--md-on-surface-variant);
}

.md3-icon-button .material-icons[data-icon="download"]:empty::before {
  content: "↓";
  font-size: 18px;
  color: var(--md-primary);
}

.md3-icon-button .material-icons[data-icon="expand_more"]:empty::before {
  content: "⌄";
  font-size: 18px;
  color: var(--md-on-surface-variant);
}

.md3-icon-button .material-icons[data-icon="expand_less"]:empty::before {
  content: "⌃";
  font-size: 18px;
  color: var(--md-on-surface-variant);
}

/* Section title icons */
.section-title .material-icons:empty::before {
  content: "●";
  font-size: 16px;
  color: var(--icon-color, var(--md-primary));
}

@media (max-width: 768px) {
  .md3-top-app-bar {
    height: 56px;
  }

  .md3-top-app-bar-content {
    padding: 0 4px;
  }

  .app-logo {
    font-size: var(--md-font-title-medium);
  }
}

/* Floating Action Bar */
.md3-floating-action-bar {
  position: fixed;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 1168px;
  height: 72px;
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-corner-large);
  box-shadow: var(--md-elevation-2);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--md-motion-duration-medium2) var(--md-motion-easing-emphasized);
}

.md3-floating-action-bar.visible {
  opacity: 1;
  visibility: visible;
}

.fab-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 16px;
}

.fab-app-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.fab-app-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--md-shape-corner-medium);
  box-shadow: var(--md-elevation-1);
}

.fab-app-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.fab-app-name {
  font-size: var(--md-font-title-medium);
  font-weight: 500;
  color: var(--md-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fab-app-meta {
  font-size: var(--md-font-body-small);
  color: var(--md-on-surface-variant);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.md3-fab-primary {
  height: 56px;
  padding: 0 24px;
  background: var(--primary-gradient);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.md3-fab-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.md3-fab-primary:active {
  box-shadow: var(--shadow-sm);
  transform: translateY(0);
}

.fab-label {
  font-weight: 500;
}

@media (max-width: 768px) {
  .md3-floating-action-bar {
    top: 56px;
    width: calc(100% - 16px);
    height: 64px;
  }

  .fab-content {
    padding: 0 12px;
  }

  .fab-app-icon {
    width: 40px;
    height: 40px;
  }

  .md3-fab-primary {
    height: 48px;
    padding: 0 20px;
    font-size: var(--md-font-label-medium);
  }
}
/* Hero Section */
.md3-hero-section {
  position: relative;
  margin-top: 64px;
  padding: 32px 0;
  background: var(--md-gradient-hero);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    ellipse at center top,
    rgba(var(--icon-color-rgb, 103, 80, 164), 0.1) 0%,
    rgba(var(--icon-color-secondary-rgb, 98, 91, 113), 0.05) 50%,
    transparent 100%
  );
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-app-showcase {
  display: flex;
  align-items: center;
  gap: 24px;
}

.hero-app-icon {
  position: relative;
  flex-shrink: 0;
}

.app-icon-large {
  width: 120px;
  height: 120px;
  border-radius: var(--md-shape-corner-extra-large);
  box-shadow: var(--md-elevation-3);
  transition: all var(--md-motion-duration-medium2) var(--md-motion-easing-emphasized);
}

.icon-glow {
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  background: radial-gradient(
    circle,
    rgba(var(--icon-color-rgb, 103, 80, 164), 0.2) 0%,
    transparent 70%
  );
  border-radius: var(--md-shape-corner-extra-large);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--md-motion-duration-medium2) var(--md-motion-easing-standard);
}

.hero-app-icon:hover .icon-glow {
  opacity: 1;
}

.hero-app-icon:hover .app-icon-large {
  transform: scale(1.05);
  box-shadow: var(--md-elevation-4);
}

.hero-app-info {
  flex: 1;
  min-width: 0;
}

.hero-app-name {
  font-size: var(--md-font-headline-medium);
  font-weight: 500;
  color: var(--md-on-surface);
  margin-bottom: 12px;
  line-height: 1.2;
}

.hero-app-info .categories-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.hero-app-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.meta-chip {
  padding: 4px 12px;
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface-variant);
  border-radius: var(--md-shape-corner-small);
  font-size: var(--md-font-label-medium);
  font-weight: 500;
}

.hero-app-rating {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}

.rating-stars {
  display: flex;
  gap: 2px;
}

.rating-stars .material-icons,
.rating-stars .material-icons-outlined {
  font-size: 20px;
  color: var(--md-outline);
}

.rating-stars .material-icons.filled {
  color: #FFB300;
}

.rating-text {
  font-size: var(--md-font-body-medium);
  color: var(--md-on-surface-variant);
}

.hero-download-btn {
  height: 48px;
  padding: 0 24px;
  background-color: var(--icon-color, var(--md-primary));
  color: var(--md-on-primary);
  border-radius: var(--md-shape-corner-full);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--md-font-label-large);
  font-weight: 500;
  box-shadow: var(--md-elevation-2);
  transition: all var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.hero-download-btn:hover {
  box-shadow: var(--md-elevation-3);
  transform: translateY(-1px);
}

.hero-download-btn:active {
  box-shadow: var(--md-elevation-1);
  transform: translateY(0);
}

@media (max-width: 768px) {
  .md3-hero-section {
    margin-top: 56px;
    padding: 24px 0;
  }

  .hero-app-showcase {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }

  .app-icon-large {
    width: 100px;
    height: 100px;
  }

  .hero-app-name {
    font-size: var(--md-font-headline-small);
  }

  .hero-app-meta {
    justify-content: center;
  }

  .hero-app-rating {
    justify-content: center;
  }
}
/* Stats Section */
.md3-stats-section {
  margin: 24px auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.md3-stats-card {
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-lg);
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.md3-stats-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg,
    rgba(var(--icon-color-rgb, 102, 126, 234), 0.05) 0%,
    transparent 100%);
  opacity: 0;
  transition: var(--transition);
}

.md3-stats-card:hover::before {
  opacity: 1;
}

.md3-stats-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  border-color: var(--md-primary);
}

.stats-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--md-shape-corner-full);
  background-color: rgba(var(--icon-color-rgb, 102, 126, 234), 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.stats-icon .material-icons {
  font-size: 20px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-primary);
}

/* Stats icon fallbacks */
.stats-icon .material-icons[data-icon="file_download"]:empty::before {
  content: "↓";
  font-size: 16px;
  color: var(--icon-color, var(--md-primary));
}

.stats-icon .material-icons[data-icon="storage"]:empty::before {
  content: "□";
  font-size: 16px;
  color: var(--icon-color, var(--md-primary));
}

.stats-icon .material-icons[data-icon="chat_bubble_outline"]:empty::before {
  content: "💬";
  font-size: 14px;
  color: var(--icon-color, var(--md-primary));
}

.stats-icon .material-icons[data-icon="favorite_border"]:empty::before {
  content: "♡";
  font-size: 16px;
  color: var(--icon-color, var(--md-primary));
}

.stats-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  position: relative;
  z-index: 1;
}

.stats-number {
  font-size: 18px;
  font-weight: 600;
  color: var(--md-on-surface);
  line-height: 1;
}

.stats-label {
  font-size: 12px;
  color: var(--md-on-surface-variant);
  text-align: center;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .md3-stats-card {
    padding: 16px 12px;
  }

  .stats-icon {
    width: 40px;
    height: 40px;
  }

  .stats-icon .material-symbols-outlined {
    font-size: 20px;
  }

  .stats-number {
    font-size: var(--md-font-title-medium);
  }
}
/* Screenshots Section */
.md3-screenshots-section {
  margin: 32px auto;
}

.section-title {
  font-size: var(--md-font-headline-small);
  font-weight: 500;
  color: var(--md-on-surface);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title .material-icons {
  font-size: 24px;
  color: var(--icon-color, var(--md-primary));
}

.screenshots-container {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--md-outline-variant) transparent;
}

.screenshots-container::-webkit-scrollbar {
  height: 6px;
}

.screenshots-container::-webkit-scrollbar-track {
  background: transparent;
}

.screenshots-container::-webkit-scrollbar-thumb {
  background-color: var(--md-outline-variant);
  border-radius: var(--md-shape-corner-full);
}

.screenshot-item {
  position: relative;
  flex-shrink: 0;
  width: 200px;
  height: 356px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  background-color: var(--md-surface-variant);
}

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.screenshot-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.screenshot-overlay .material-icons {
  font-size: 32px;
  color: white;
}

/* No screenshots state */
.no-screenshots {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--md-on-surface-variant);
}

.no-screenshots-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--md-shape-corner-full);
  background-color: var(--md-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.no-screenshots-icon .material-icons {
  font-size: 32px;
  color: var(--md-on-surface-variant);
}

.no-screenshots-text {
  font-size: var(--md-font-body-large);
  color: var(--md-on-surface-variant);
  margin: 0;
}

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

.screenshot-item:hover .screenshot-overlay {
  opacity: 1;
}

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

@media (max-width: 768px) {
  .screenshot-item {
    width: 160px;
    height: 284px;
  }

  .screenshots-container {
    gap: 12px;
  }
}
/* Categories Section (已移至 hero-app-info 中) */
.md3-categories-section {
  display: none; /* 不再使用独立的分类区域 */
}

.categories-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.md3-chip-primary,
.md3-chip-secondary {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.md3-chip-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-sm);
}

.md3-chip-primary:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.md3-chip-secondary {
  background-color: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border: 1px solid var(--md-outline-variant);
}

.md3-chip-secondary:hover {
  background-color: var(--md-secondary);
  color: var(--md-on-secondary);
  border-color: var(--md-secondary);
  transform: translateY(-2px);
}

/* Notice Card */
.md3-notice-card {
  margin: 24px auto;
  padding: 16px;
  background-color: var(--md-error-container);
  color: var(--md-on-error-container);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--md-error);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.notice-icon .material-icons {
  font-size: 20px;
  color: var(--md-error);
}

.notice-content p {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
}

/* Content Cards (替代折叠卡片) */
.md3-whats-new-section,
.md3-description-section {
  margin: 24px auto;
}

.md3-content-card {
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.content-header {
  padding: 16px 20px;
  background: linear-gradient(135deg,
    rgba(var(--md-primary-rgb), 0.05) 0%,
    transparent 100%);
  border-bottom: 1px solid var(--md-outline-variant);
}

.content-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.content-title h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--md-on-surface);
  margin: 0;
}

.content-title .material-icons {
  font-size: 24px;
  color: var(--md-primary);
}

.content-body {
  padding: 20px;
}

/* 保留旧的expansion样式以兼容其他可能的折叠卡片 */
.md3-expansion-card {
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
}

.md3-expansion-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--md-outline);
}

.md3-expansion-card.expanded {
  box-shadow: var(--shadow-md);
  border-color: var(--md-primary);
}

.md3-expansion-card.expanded::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-gradient);
  z-index: 1;
}

.expansion-header {
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background-color var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.expansion-header:hover {
  background-color: rgba(var(--icon-color-rgb, 102, 126, 234), 0.04);
}

.md3-expansion-card.expanded .expansion-header {
  background-color: rgba(var(--icon-color-rgb, 102, 126, 234), 0.08);
}

.expansion-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.expansion-title h2 {
  font-size: var(--md-font-title-large);
  font-weight: 500;
  color: var(--md-on-surface);
  margin: 0;
}

.expansion-title .material-icons {
  font-size: 24px;
  color: var(--icon-color, var(--md-primary));
}

.expansion-toggle .material-icons {
  font-size: 24px;
  color: var(--md-on-surface-variant);
  transition: transform var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.expansion-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all var(--md-motion-duration-medium2) var(--md-motion-easing-emphasized);
  padding: 0 20px;
  background-color: rgba(var(--icon-color-rgb, 66, 133, 244), 0.02);
}

.expansion-content.expanded {
  max-height: 1000px;
  opacity: 1;
  padding: 20px;
  border-top: 1px solid var(--md-outline-variant);
}

/* When expanded, rotate the toggle icon */
.md3-expansion-card.expanded .expansion-toggle .material-icons {
  transform: rotate(180deg);
}

.version-info {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--md-outline-variant);
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(135deg,
    rgba(var(--icon-color-rgb, 102, 126, 234), 0.1),
    rgba(var(--icon-color-rgb, 102, 126, 234), 0.05));
  color: var(--md-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 16px;
  border: 1px solid rgba(var(--icon-color-rgb, 66, 133, 244), 0.2);
}

.version-badge .material-icons {
  font-size: 18px;
}

.version-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--md-font-body-small);
  color: var(--md-on-surface-variant);
  padding: 8px 12px;
  background-color: var(--md-surface-variant);
  border-radius: var(--md-shape-corner-small);
  transition: background-color var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.meta-item:hover {
  background-color: var(--md-surface-container-high);
}

.meta-item .material-icons {
  font-size: 16px;
}

.update-content,
.description-text {
  padding: 0;
  margin-top: 16px;
}

.update-content p,
.description-text p {
  margin: 0;
  font-size: var(--md-font-body-medium);
  line-height: 1.7;
  color: var(--md-on-surface);
  padding: 16px;
  background-color: var(--md-surface-container-lowest);
  border-radius: var(--md-shape-corner-medium);
  border-left: 4px solid var(--icon-color, var(--md-primary));
}
/* Related Apps Section */
.md3-related-apps-section {
  margin: 32px auto 120px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.md3-text-button {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  color: var(--icon-color, var(--md-primary));
  font-size: var(--md-font-label-large);
  font-weight: 500;
  border-radius: var(--md-shape-corner-small);
  transition: all var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.md3-text-button:hover {
  background-color: rgba(var(--icon-color-rgb, 103, 80, 164), var(--md-state-hover));
}

.md3-text-button .material-icons {
  font-size: 18px;
}

.related-apps-container {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--md-outline-variant) transparent;
}

.related-apps-container::-webkit-scrollbar {
  height: 6px;
}

.related-apps-container::-webkit-scrollbar-track {
  background: transparent;
}

.related-apps-container::-webkit-scrollbar-thumb {
  background-color: var(--md-outline-variant);
  border-radius: var(--md-shape-corner-full);
}

.related-app-card {
  flex-shrink: 0;
  width: 280px;
  padding: 16px;
  background-color: var(--md-surface);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.related-app-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--md-primary);
}

.related-app-icon {
  flex-shrink: 0;
}

.related-app-icon img {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.related-app-info {
  flex: 1;
  min-width: 0;
}

.related-app-name {
  font-size: var(--md-font-title-medium);
  font-weight: 500;
  color: var(--md-on-surface);
  margin: 0 0 4px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.related-app-meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--md-font-body-small);
  color: var(--md-on-surface-variant);
}

.related-app-meta .material-icons {
  font-size: 16px;
  color: #FFB300;
}

.md3-button-outlined {
  padding: 8px 16px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-corner-large);
  background-color: transparent;
  color: var(--icon-color, var(--md-primary));
  font-size: var(--md-font-label-medium);
  font-weight: 500;
  transition: all var(--md-motion-duration-short2) var(--md-motion-easing-standard);
}

.md3-button-outlined:hover {
  background-color: rgba(var(--icon-color-rgb, 103, 80, 164), var(--md-state-hover));
  border-color: var(--icon-color, var(--md-primary));
}

@media (max-width: 768px) {
  .related-app-card {
    width: 260px;
    padding: 12px;
  }

  .related-app-icon img {
    width: 48px;
    height: 48px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}
/* Bottom Navigation */
.md3-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--primary-gradient);
  background-size: 200% 200%;
  animation: gradientShift 15s ease infinite;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

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

.bottom-nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.bottom-nav-brand {
  display: flex;
  flex-direction: column;
}

.brand-logo {
  font-size: 22px;
  font-weight: 600;
  color: white;
  letter-spacing: 0.5px;
}

.brand-tagline {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.9);
  margin-top: 2px;
}

.bottom-nav-actions .md3-button-primary {
  height: 48px;
  padding: 0 24px;
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--md-on-primary);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--md-shape-corner-large);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--md-font-label-large);
  font-weight: 500;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--md-motion-duration-short2) var(--md-motion-easing-standard);
  position: relative;
  overflow: hidden;
}

.bottom-nav-actions .md3-button-primary::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;
}

.bottom-nav-actions .md3-button-primary:hover {
  background-color: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-1px);
  box-shadow: var(--md-elevation-2);
}

.bottom-nav-actions .md3-button-primary:hover::before {
  left: 100%;
}

.bottom-nav-actions .md3-button-primary:active {
  transform: translateY(0);
  box-shadow: var(--md-elevation-1);
}

/* Button Components */
.md3-button-primary {
  height: 48px;
  padding: 0 32px;
  background: var(--primary-gradient);
  color: white;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  min-width: 120px;
}

.md3-button-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.md3-button-primary:active {
  box-shadow: var(--shadow-sm);
  transform: translateY(0);
}

.md3-button-primary .material-icons {
  font-size: 18px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: currentColor;
  margin-right: 4px;
}

.md3-button-primary .material-icons:empty::before {
  content: "↓";
  font-size: 14px;
  color: currentColor;
}

/* Toast Component */
.md3-toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--md-inverse-surface);
  color: var(--md-inverse-on-surface);
  padding: 12px 16px;
  border-radius: var(--md-shape-corner-small);
  font-size: var(--md-font-body-medium);
  box-shadow: var(--md-elevation-3);
  z-index: 2000;
  opacity: 0;
  transition: all var(--md-motion-duration-medium2) var(--md-motion-easing-emphasized);
}

.md3-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 768px) {
  .bottom-nav-content {
    padding: 12px 16px;
  }

  .brand-logo {
    font-size: var(--md-font-title-medium);
  }

  .brand-tagline {
    font-size: var(--md-font-label-small);
  }

  .bottom-nav-actions .md3-button-primary {
    height: 40px;
    padding: 0 20px;
    font-size: var(--md-font-label-medium);
  }

  .md3-toast {
    bottom: 80px;
    left: 16px;
    right: 16px;
    transform: translateY(100px);
  }

  .md3-toast.show {
    transform: translateY(0);
  }
}
/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.d-flex {
  display: flex;
}

.d-none {
  display: none;
}

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

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

.justify-content-between {
  justify-content: space-between;
}

.gap-8 {
  gap: 8px;
}

.gap-16 {
  gap: 16px;
}

.gap-24 {
  gap: 24px;
}

.mb-16 {
  margin-bottom: 16px;
}

.mb-24 {
  margin-bottom: 24px;
}

.mb-32 {
  margin-bottom: 32px;
}

.p-16 {
  padding: 16px;
}

.p-24 {
  padding: 24px;
}

/* Animation Keyframes */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

/* Loading States */
.loading-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200px 100%;
  animation: shimmer 1.5s infinite;
}

/* Focus States */
.md3-icon-button:focus-visible,
.md3-button-primary:focus-visible,
.md3-button-outlined:focus-visible,
.md3-text-button:focus-visible {
  outline: 2px solid var(--icon-color, var(--md-primary));
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --md-outline: #000000;
    --md-outline-variant: #666666;
  }

  .md3-stats-card,
  .md3-expansion-card,
  .related-app-card {
    border-width: 2px;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .app-icon-large,
  .screenshot-item,
  .related-app-card {
    transform: none !important;
  }
}

/* Print Styles */
@media print {
  .md3-top-app-bar,
  .md3-floating-action-bar,
  .md3-bottom-nav {
    display: none;
  }

  .md3-hero-section {
    margin-top: 0;
  }

  body {
    background: var(--bg-primary);
  }
}

  .md3-stats-card,
  .md3-expansion-card,
  .related-app-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}
/* 图片查看器弹窗 */
.image-viewer-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 9999;
  animation: fadeIn 0.3s ease;
}

.image-viewer-modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.viewer-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10001;
}

.viewer-close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

.viewer-close .material-icons {
  font-size: 28px;
  color: white;
}

.viewer-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-image {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: zoomIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.viewer-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10001;
}

.viewer-nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.viewer-nav.disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.viewer-nav-prev {
  left: 20px;
}

.viewer-nav-next {
  right: 20px;
}

.viewer-nav .material-icons {
  font-size: 28px;
  color: white;
}

.viewer-counter {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: white;
  font-size: 14px;
  font-weight: 500;
  z-index: 10001;
}

.viewer-actions {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 10001;
}

.viewer-action-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.viewer-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.viewer-action-btn .material-icons {
  font-size: 24px;
  color: white;
}

@media (max-width: 768px) {
  .viewer-close,
  .viewer-nav,
  .viewer-action-btn {
    width: 40px;
    height: 40px;
  }

  .viewer-close .material-icons,
  .viewer-nav .material-icons {
    font-size: 24px;
  }

  .viewer-nav-prev {
    left: 10px;
  }

  .viewer-nav-next {
    right: 10px;
  }

  .viewer-counter {
    bottom: 10px;
    padding: 8px 16px;
    font-size: 12px;
  }

  .viewer-actions {
    top: 10px;
    gap: 8px;
  }
}

/* End of MD3 Expressive Styles */