:root {
  --color-primary: #ff6b6b;
  --color-primary-hover: #ff5252;
  --color-secondary: #4ecdc4;
  --color-accent: #ffd93d;
  --color-gradient-start: #ff6b6b;
  --color-gradient-end: #ffd93d;
  --color-bg: #f7f8fc;
  --color-bg-card: #ffffff;
  --color-bg-alt: #f0f2f8;
  --color-text: #1a1a2e;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-border: #e5e7eb;
  --color-border-hover: #d1d5db;
  --color-shadow: rgba(0, 0, 0, 0.08);
  --color-shadow-hover: rgba(255, 107, 107, 0.25);
  --color-modal-mask: rgba(0, 0, 0, 0.6);
  --color-like: #ff4757;
  --color-tag-1: #ff6b6b;
  --color-tag-2: #4ecdc4;
  --color-tag-3: #a8e6cf;
  --color-tag-4: #ffd93d;
  --color-tag-5: #c56cf0;
  --color-tag-6: #17c0eb;
  --color-tag-7: #86e2d5;
  --color-tag-8: #ff9ff3;
  --color-tag-9: #54a0ff;
  --color-tag-10: #feca57;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
  --shadow-hover: 0 12px 40px var(--color-shadow-hover);
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
  --header-height: 64px;
  --container-max: 1280px;
  --card-max-height: 360px;
}

[data-theme="dark"] {
  --color-primary: #ff6b6b;
  --color-primary-hover: #ff8585;
  --color-secondary: #4ecdc4;
  --color-accent: #ffd93d;
  --color-gradient-start: #ff6b6b;
  --color-gradient-end: #c56cf0;
  --color-bg: #0f0f1a;
  --color-bg-card: #1c1c2e;
  --color-bg-alt: #252542;
  --color-text: #f0f0f5;
  --color-text-secondary: #b0b0c5;
  --color-text-muted: #7a7a90;
  --color-border: #3a3a55;
  --color-border-hover: #4a4a6a;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-hover: rgba(255, 107, 107, 0.35);
  --color-modal-mask: rgba(0, 0, 0, 0.8);
  --color-tag-1: #ff6b6b;
  --color-tag-2: #4ecdc4;
  --color-tag-3: #65d6a8;
  --color-tag-4: #ffd93d;
  --color-tag-5: #c56cf0;
  --color-tag-6: #17c0eb;
  --color-tag-7: #26de81;
  --color-tag-8: #ff9ff3;
  --color-tag-9: #54a0ff;
  --color-tag-10: #feca57;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

input {
  font-family: inherit;
  outline: none;
  border: none;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-card);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  height: var(--header-height);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  white-space: nowrap;
}

.logo-icon {
  font-size: 28px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.logo-text {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 4px;
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.nav-link.active {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.nav-fav {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1), rgba(255, 217, 61, 0.1));
  color: var(--color-primary);
  border: 1px solid rgba(255, 107, 107, 0.2);
}

.fav-count {
  background: var(--color-primary);
  color: white;
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  transform: rotate(20deg) scale(1.1);
  background: var(--color-bg-card);
  box-shadow: var(--shadow-md);
}

.theme-toggle span {
  position: absolute;
  transition: all var(--transition-normal);
  font-size: 20px;
}

.theme-icon-light { opacity: 1; transform: rotate(0deg); }
.theme-icon-dark { opacity: 0; transform: rotate(-90deg); }

[data-theme="dark"] .theme-icon-light { opacity: 0; transform: rotate(90deg); }
[data-theme="dark"] .theme-icon-dark { opacity: 1; transform: rotate(0deg); }

.hero-section {
  padding: 60px 0 40px;
  background: linear-gradient(180deg,
    var(--color-bg-card) 0%,
    transparent 100%);
}

.hero-title {
  text-align: center;
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 900;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: clamp(14px, 2vw, 18px);
  margin-bottom: 36px;
}

.search-box {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 20px;
  font-size: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
  z-index: 1;
}

.search-input {
  width: 100%;
  padding: 18px 56px 18px 56px;
  font-size: 16px;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.1), var(--shadow-md);
}

.search-clear {
  position: absolute;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  transition: all var(--transition-fast);
}

.search-clear:hover {
  background: var(--color-primary);
  color: white;
  transform: scale(1.1);
}

.filter-section {
  padding: 20px 0 12px;
  position: sticky;
  top: var(--header-height);
  z-index: 90;
  background: var(--color-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.tabs-wrapper {
  width: 100%;
  margin-bottom: 16px;
}

.tabs-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding-bottom: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) transparent;
}

.tabs-scroll::-webkit-scrollbar {
  height: 4px;
}

.tabs-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.tabs-scroll::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}

.tab-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-xl);
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
}

.tab-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

.tab-icon {
  font-size: 16px;
}

.fav-badge {
  background: white;
  color: var(--color-primary);
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
  font-weight: 700;
}

.tab-btn.tab-favorites {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.08), rgba(255, 217, 61, 0.08));
  border-color: rgba(255, 107, 107, 0.3);
}

.tab-btn.tab-favorites.active {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
}

.sort-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.sort-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.sort-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.sort-btn {
  padding: 7px 14px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.sort-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.sort-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.result-info {
  margin-left: auto;
  font-size: 13px;
  color: var(--color-text-muted);
}

.result-info span {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 15px;
}

.collections-section {
  padding: 40px 0 24px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 800;
}

.scroll-hint {
  font-size: 13px;
  color: var(--color-text-muted);
}

.collections-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 8px 4px 20px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--color-secondary) transparent;
}

.collections-scroll::-webkit-scrollbar {
  height: 6px;
}

.collections-scroll::-webkit-scrollbar-track {
  background: var(--color-bg-alt);
  border-radius: 3px;
}

.collections-scroll::-webkit-scrollbar-thumb {
  background: var(--color-secondary);
  border-radius: 3px;
}

.collection-card {
  flex-shrink: 0;
  width: 280px;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-slow);
  border: 1px solid var(--color-border);
}

.collection-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.collection-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  height: 180px;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.collection-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.collection-card:hover .collection-preview img {
  transform: scale(1.05);
}

.collection-info {
  padding: 16px;
}

.collection-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.collection-count {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.collection-count span {
  color: var(--color-secondary);
  font-weight: 700;
}

.tags-section {
  padding: 24px 0;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 8px 0;
}

.tag-item {
  padding: 8px 18px;
  border-radius: var(--radius-xl);
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.tag-item::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 var(--transition-slow);
}

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

.tag-item:hover {
  transform: translateY(-3px) scale(1.05);
  color: white;
  box-shadow: var(--shadow-md);
}

.tag-item.tag-size-1 { font-size: 12px; padding: 6px 14px; }
.tag-item.tag-size-2 { font-size: 14px; padding: 7px 16px; }
.tag-item.tag-size-3 { font-size: 16px; padding: 8px 18px; font-weight: 700; }
.tag-item.tag-size-4 { font-size: 18px; padding: 9px 20px; font-weight: 800; }
.tag-item.tag-size-5 { font-size: 20px; padding: 10px 22px; font-weight: 800; }

.tag-item.color-1 { color: var(--color-tag-1); }
.tag-item.color-1:hover { background: linear-gradient(135deg, var(--color-tag-1), var(--color-gradient-end)); border-color: transparent; }
.tag-item.color-2 { color: var(--color-tag-2); }
.tag-item.color-2:hover { background: linear-gradient(135deg, var(--color-tag-2), var(--color-tag-7)); border-color: transparent; }
.tag-item.color-3 { color: var(--color-tag-3); }
.tag-item.color-3:hover { background: linear-gradient(135deg, var(--color-tag-3), var(--color-tag-2)); border-color: transparent; }
.tag-item.color-4 { color: var(--color-tag-4); }
.tag-item.color-4:hover { background: linear-gradient(135deg, var(--color-tag-4), var(--color-tag-10)); border-color: transparent; }
.tag-item.color-5 { color: var(--color-tag-5); }
.tag-item.color-5:hover { background: linear-gradient(135deg, var(--color-tag-5), var(--color-tag-8)); border-color: transparent; }
.tag-item.color-6 { color: var(--color-tag-6); }
.tag-item.color-6:hover { background: linear-gradient(135deg, var(--color-tag-6), var(--color-tag-9)); border-color: transparent; }
.tag-item.color-7 { color: var(--color-tag-7); }
.tag-item.color-7:hover { background: linear-gradient(135deg, var(--color-tag-7), var(--color-tag-2)); border-color: transparent; }
.tag-item.color-8 { color: var(--color-tag-8); }
.tag-item.color-8:hover { background: linear-gradient(135deg, var(--color-tag-8), var(--color-tag-5)); border-color: transparent; }
.tag-item.color-9 { color: var(--color-tag-9); }
.tag-item.color-9:hover { background: linear-gradient(135deg, var(--color-tag-9), var(--color-tag-6)); border-color: transparent; }
.tag-item.color-10 { color: var(--color-tag-10); }
.tag-item.color-10:hover { background: linear-gradient(135deg, var(--color-tag-10), var(--color-tag-4)); border-color: transparent; }

.tag-item.active {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

.memes-section {
  padding: 24px 0 60px;
  min-height: 400px;
}

.status-container {
  padding: 60px 0;
}

.loading-state,
.empty-state,
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
  padding: 60px 20px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-bg-alt);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-state p,
.empty-state p,
.error-state p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.empty-icon,
.error-icon {
  font-size: 64px;
  animation: wobble 2s ease-in-out infinite;
}

@keyframes wobble {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

.empty-state h3,
.error-state h3 {
  font-size: 20px;
  font-weight: 700;
}

.btn-retry {
  padding: 12px 28px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  font-weight: 700;
  font-size: 14px;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.btn-retry:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.meme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px;
  align-items: start;
}

.meme-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-slow);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: relative;
}

.meme-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}

.meme-badges {
  position: absolute;
  top: 10px;
  left: 10px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

.meme-badge {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 700;
  color: white;
  backdrop-filter: blur(8px);
}

.badge-hot {
  background: linear-gradient(135deg, #ff4757, #ff6b81);
  box-shadow: 0 2px 8px rgba(255, 71, 87, 0.4);
}

.badge-new {
  background: linear-gradient(135deg, #2ed573, #7bed9f);
  box-shadow: 0 2px 8px rgba(46, 213, 115, 0.4);
}

.badge-format {
  background: rgba(0, 0, 0, 0.6);
  right: 10px;
  left: auto;
}

.meme-image-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.meme-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow), filter var(--transition-normal);
}

.meme-card:hover .meme-image-wrap img {
  transform: scale(1.1);
}

.meme-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,0.7) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 16px;
  gap: 10px;
}

.meme-card:hover .meme-overlay {
  opacity: 1;
}

.overlay-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: white;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition-fast);
  transform: translateY(10px);
  opacity: 0;
  box-shadow: var(--shadow-md);
}

.meme-card:hover .overlay-btn {
  transform: translateY(0);
  opacity: 1;
}

.meme-card:hover .overlay-btn:nth-child(2) { transition-delay: 50ms; }
.meme-card:hover .overlay-btn:nth-child(3) { transition-delay: 100ms; }

.overlay-btn:hover {
  transform: scale(1.15) !important;
  background: var(--color-primary);
  color: white;
}

.overlay-btn.liked {
  background: var(--color-like);
  color: white;
}

.meme-info {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.meme-name {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 40px;
}

.meme-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--color-text-muted);
}

.meme-size {
  display: flex;
  align-items: center;
  gap: 4px;
}

.meme-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.stat-item.likes {
  color: var(--color-like);
  font-weight: 600;
}

.stat-item.downloads {
  color: var(--color-secondary);
  font-weight: 600;
}

.meme-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 4px;
  border-top: 1px dashed var(--color-border);
}

.tag-chip {
  padding: 3px 10px;
  border-radius: var(--radius-xl);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-size: 11px;
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tag-chip:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

.site-footer {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: 30px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
}

.footer-copy {
  color: var(--color-text-muted);
  font-size: 13px;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  font-size: 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 80;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-slow);
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 16px 48px var(--color-shadow-hover);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  padding: 20px;
}

.modal.open {
  opacity: 1;
  visibility: visible;
}

.modal-mask {
  position: absolute;
  inset: 0;
  background: var(--color-modal-mask);
  backdrop-filter: blur(4px);
}

.modal-dialog {
  position: relative;
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.4);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-slow);
}

.modal.open .modal-dialog {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-primary);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  max-height: 90vh;
}

.modal-image-section {
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
  min-height: 400px;
  position: relative;
}

.modal-image-section img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.modal-detail-section {
  padding: 30px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.detail-title {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.4;
  padding-right: 40px;
}

.detail-author-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.detail-author {
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

.detail-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 12px;
  color: var(--color-text-muted);
}

.info-value {
  font-size: 14px;
  font-weight: 700;
}

.format-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-secondary);
  color: white;
  font-size: 12px;
  font-weight: 700;
  width: fit-content;
}

.detail-stats {
  display: flex;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.detail-stat {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.detail-stat:hover {
  background: var(--color-bg-alt);
}

.detail-stat-num {
  font-size: 20px;
  font-weight: 800;
}

.detail-stat-num.likes { color: var(--color-like); }
.detail-stat-num.downloads { color: var(--color-secondary); }
.detail-stat-num.views { color: var(--color-accent); }

.detail-stat-label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-tag-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
}

.detail-collections {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.collection-chip {
  padding: 6px 14px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(78, 205, 196, 0.15), rgba(23, 192, 235, 0.15));
  border: 1px solid var(--color-secondary);
  color: var(--color-secondary);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.collection-chip:hover {
  background: var(--color-secondary);
  color: white;
  transform: translateY(-2px);
}

.detail-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: auto;
  padding-top: 8px;
}

.action-btn {
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.action-btn.primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: white;
  box-shadow: var(--shadow-md);
}

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

.action-btn.secondary {
  background: var(--color-bg-alt);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

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

.action-btn.liked {
  background: var(--color-like);
  color: white;
  border-color: var(--color-like);
}

.action-btn.copy-success {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

.toast {
  position: fixed;
  top: calc(var(--header-height) + 20px);
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  padding: 12px 24px;
  border-radius: var(--radius-xl);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
  max-width: 90vw;
  text-align: center;
}

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

.toast.success { background: linear-gradient(135deg, #2ed573, #7bed9f); color: white; }
.toast.error { background: linear-gradient(135deg, #ff4757, #ff6b81); color: white; }
.toast.info { background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end)); color: white; }

@media (max-width: 1200px) {
  .container { padding: 0 16px; }
  .meme-grid {
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 16px;
  }
  .header-nav { gap: 4px; }
  .nav-link { padding: 6px 12px; font-size: 13px; }
}

@media (max-width: 768px) {
  :root { --header-height: 56px; }
  .header-nav { display: none; }
  .header-inner { gap: 12px; }
  .logo-text { font-size: 16px; }
  .logo-icon { font-size: 22px; }
  .theme-toggle { width: 36px; height: 36px; }
  .theme-toggle span { font-size: 16px; }
  .hero-section { padding: 36px 0 24px; }
  .hero-title { font-size: 32px; }
  .search-input { padding: 14px 48px 14px 48px; font-size: 14px; }
  .filter-section { top: var(--header-height); }
  .tab-btn { padding: 8px 14px; font-size: 13px; }
  .tab-icon { font-size: 14px; }
  .sort-row { gap: 10px; }
  .sort-label { display: none; }
  .result-info { font-size: 12px; width: 100%; order: 3; }
  .collections-section { padding: 28px 0 16px; }
  .collection-card { width: 240px; }
  .collection-preview { height: 150px; }
  .meme-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
  }
  .meme-name { font-size: 13px; min-height: 36px; }
  .meme-info { padding: 10px; gap: 8px; }
  .meme-tags { display: none; }
  .modal-body {
    grid-template-columns: 1fr;
    max-height: 95vh;
  }
  .modal-image-section {
    min-height: 250px;
    max-height: 50vh;
    padding: 20px;
  }
  .modal-image-section img { max-height: 40vh; }
  .modal-detail-section {
    padding: 20px;
    max-height: 45vh;
  }
  .detail-title { font-size: 18px; padding-right: 40px; }
  .detail-info-grid { gap: 8px; padding: 12px; }
  .detail-actions { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .action-btn { padding: 12px 10px; font-size: 13px; }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 12px; }
  .logo-text { display: none; }
  .hero-section { padding: 24px 0 16px; }
  .hero-title { font-size: 26px; }
  .hero-subtitle { font-size: 13px; margin-bottom: 24px; }
  .search-box { max-width: 100%; }
  .tabs-scroll { gap: 6px; }
  .tab-btn { padding: 7px 12px; font-size: 12px; gap: 4px; }
  .tab-icon { font-size: 13px; }
  .sort-btn { padding: 6px 10px; font-size: 12px; }
  .sort-buttons { gap: 4px; }
  .section-title { font-size: 20px; }
  .collection-card { width: 200px; }
  .collection-preview { height: 130px; }
  .collection-info { padding: 12px; }
  .collection-name { font-size: 14px; }
  .meme-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .meme-card { border-radius: var(--radius-md); }
  .meme-badges { top: 6px; left: 6px; }
  .meme-badge { padding: 3px 8px; font-size: 10px; }
  .meme-name { font-size: 12px; min-height: 32px; -webkit-line-clamp: 2; }
  .meme-meta { font-size: 11px; flex-wrap: wrap; gap: 4px; }
  .meme-stats { font-size: 11px; flex-wrap: wrap; }
  .overlay-btn { width: 34px; height: 34px; font-size: 14px; }
  .tag-cloud { gap: 8px; }
  .tag-item { padding: 6px 14px; font-size: 13px; }
  .tag-item.tag-size-1 { font-size: 11px; padding: 5px 12px; }
  .tag-item.tag-size-2 { font-size: 12px; padding: 5px 12px; }
  .tag-item.tag-size-3 { font-size: 14px; padding: 6px 14px; }
  .tag-item.tag-size-4 { font-size: 15px; padding: 7px 16px; }
  .tag-item.tag-size-5 { font-size: 16px; padding: 8px 18px; }
  .modal-dialog { border-radius: var(--radius-lg); }
  .modal-close { top: 10px; right: 10px; width: 34px; height: 34px; font-size: 15px; }
  .detail-title { font-size: 16px; padding-right: 40px; }
  .detail-info-grid { grid-template-columns: 1fr; gap: 8px; }
  .detail-stats { gap: 8px; }
  .detail-stat { padding: 6px 4px; }
  .detail-stat-num { font-size: 16px; }
  .detail-actions { grid-template-columns: 1fr; gap: 8px; }
  .action-btn { padding: 14px; }
  .site-footer { padding: 20px 0; }
  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
  }
}