/* ========================================
   Emoji 图标库 - 样式表 v4
   主题：温暖琥珀 · 复古克制
   ======================================== */

/* CSS Variables — 浅色：奶油米 + 烧砖橘 */
:root {
  --primary: #c2410c;
  --primary-dark: #9a3412;
  --primary-light: #ea580c;
  --primary-glow: rgba(194, 65, 12, 0.14);
  --bg-primary: #fbf9f4;
  --bg-secondary: #f3efe6;
  --bg-card: #ffffff;
  --bg-card-hover: #fdfaf3;
  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-muted: #a8a29e;
  --border-color: #e7e2d6;
  --border-light: #efeae0;
  --accent-ink: #422006;
  --shadow-sm: 0 1px 2px rgba(60, 40, 20, 0.05);
  --shadow-md: 0 2px 4px rgba(60, 40, 20, 0.06), 0 1px 2px rgba(60, 40, 20, 0.04);
  --shadow-lg: 0 6px 12px -2px rgba(60, 40, 20, 0.10), 0 2px 4px -1px rgba(60, 40, 20, 0.06);
  --shadow-xl: 0 12px 24px -4px rgba(60, 40, 20, 0.14), 0 4px 8px -2px rgba(60, 40, 20, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --radius-2xl: 22px;
  --radius-full: 9999px;
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'JetBrains Mono', Monaco, Consolas, monospace;
}

/* Dark Mode — 深炭 + 暖橘 */
[data-theme="dark"] {
  --primary: #fb923c;
  --primary-dark: #f97316;
  --primary-light: #fdba74;
  --primary-glow: rgba(251, 146, 60, 0.18);
  --bg-primary: #1c1917;
  --bg-secondary: #292524;
  --bg-card: #292524;
  --bg-card-hover: #34302c;
  --text-primary: #fafaf9;
  --text-secondary: #d6d3d1;
  --text-muted: #a8a29e;
  --border-color: #44403c;
  --border-light: #38332f;
  --accent-ink: #fed7aa;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 6px 12px -2px rgba(0, 0, 0, 0.45), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 12px 24px -4px rgba(0, 0, 0, 0.55), 0 4px 8px -2px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

a, button, input, .icon-card, .category-chip, .pagination-btn, .modal-btn, .selection-bar-btn {
  touch-action: manipulation;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-secondary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-slow), color var(--transition-normal);
}

/* 细腻的纸纹纹理 — 给页面一点质感，不抢戏 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(60, 40, 20, 0.025) 1px, transparent 0);
  background-size: 22px 22px;
  pointer-events: none;
  z-index: -1;
}

[data-theme="dark"] body::before {
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255, 240, 220, 0.018) 1px, transparent 0);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.header.scrolled {
  box-shadow: 0 1px 0 var(--border-color), 0 4px 16px rgba(60, 40, 20, 0.06);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 6px var(--primary-glow), inset 0 -2px 0 rgba(0, 0, 0, 0.08);
}

.logo-icon:hover {
  transform: scale(1.05) rotate(-3deg);
  box-shadow: 0 4px 10px var(--primary-glow);
}

.logo-text {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.logo-sub {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--primary);
}

.icon-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Search */
.search-wrapper {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: 0.625rem 1rem 0.625rem 2.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  background: var(--bg-card);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

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

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-card-hover);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search-shortcut {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  background: var(--border-light);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-family: monospace;
  pointer-events: none;
}

/* Main */
.main {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Category Bar — 顶部横向 */
.category-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 84px;
  z-index: 90;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  box-shadow: var(--shadow-sm);
  animation: slideDown 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.05s backwards;
}

.category-bar::-webkit-scrollbar {
  display: none;
}

.category-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.category-chip {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.category-chip:hover {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.category-chip.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 2px 6px var(--primary-glow);
}

.category-chip .count {
  margin-left: auto;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.06);
  font-size: 0.65rem;
}

[data-theme="dark"] .category-chip .count {
  background: rgba(255, 255, 255, 0.12);
}

.category-chip.active .count {
  background: rgba(255, 255, 255, 0.2);
}

/* Icon Grid */
/* Icon Grid — 手机端自适应 */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-bottom: 2rem;
}

/* 平板 — 自适应填充 */
@media (min-width: 641px) {
  .icon-grid {
    grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
    gap: 0.875rem;
  }
}

/* 桌面端 — 固定 10 列 */
@media (min-width: 1024px) {
  .icon-grid {
    grid-template-columns: repeat(10, 1fr);
    gap: 1rem;
  }
}

/* 大屏 — 仍然 10 列但更舒展 */
@media (min-width: 1400px) {
  .icon-grid {
    gap: 1.125rem;
  }
}

/* Icon Card */
.icon-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition-normal), border-color var(--transition-fast), box-shadow var(--transition-normal), background var(--transition-fast);
  animation: scaleIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
  overflow: hidden;
}

.icon-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

.icon-card:active {
  transform: translateY(-1px);
}

.icon-emoji {
  font-size: 2rem;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  transition: transform var(--transition-fast);
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.08));
}

.icon-card:hover .icon-emoji {
  transform: scale(1.15);
}

.icon-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.3;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Icon Card Actions */
.icon-actions {
  position: absolute;
  top: 6px;
  right: 6px;
  opacity: 0;
  transform: scale(0.8) translateY(-4px);
  transition: all var(--transition-fast);
}

.icon-card:hover .icon-actions {
  opacity: 1;
  transform: scale(1) translateY(0);
}

.icon-action-btn {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.625rem;
  transition: all var(--transition-fast);
}

.icon-action-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.icon-action-btn.copied {
  background: #10b981;
  color: white;
  border-color: #10b981;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

/* Copy Animation */
@keyframes copyPulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.icon-card.copied {
  animation: copyPulse 0.5s ease;
  border-color: #10b981;
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Pagination */
.pagination {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 0;
}

@media (min-width: 640px) {
  .pagination {
    flex-direction: row;
    justify-content: space-between;
  }
}

.pagination-info {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.pagination-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--primary);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-info {
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 0 0.5rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  background: var(--accent-ink);
  color: #fff;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

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

/* Preview Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(28, 25, 23, 0.55);
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.85);
  background: var(--bg-primary);
  border-radius: var(--radius-2xl);
  padding: 2.5rem 2rem 2rem;
  width: 90%;
  max-width: 420px;
  z-index: 301;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-slow);
  text-align: center;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.visible .modal {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.modal-emoji {
  font-size: 5.5rem;
  margin-bottom: 1rem;
  filter: drop-shadow(0 2px 6px rgba(60, 40, 20, 0.18));
}

.modal-name {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

/* Modal Meta */
.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.modal-meta-item {
  padding: 0.375rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-family: 'SF Mono', Monaco, monospace;
  border: 1px solid var(--border-light);
}

.modal-keywords {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.modal-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  letter-spacing: 0.01em;
}

.modal-btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 6px var(--primary-glow);
}

.modal-btn-primary:hover {
  transform: translateY(-2px);
  background: var(--primary-dark);
  box-shadow: 0 4px 10px var(--primary-glow);
}

.modal-btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.modal-btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
}

/* Keyboard Shortcuts Hint */
.shortcuts-hint {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  z-index: 50;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  pointer-events: none;
}

.shortcuts-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

.shortcuts-hint kbd {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-family: monospace;
  font-size: 0.7rem;
  margin: 0 0.125rem;
}

/* Footer */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
  text-align: center;
  margin-top: auto;
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.88) translateY(14px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

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

/* Modal Info */
.modal-info {
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.modal-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.375rem 0;
  font-size: 0.8125rem;
}

.modal-info-row:not(:last-child) {
  border-bottom: 1px solid var(--border-light);
}

.modal-info-label {
  color: var(--text-muted);
  font-weight: 500;
}

.modal-info-value {
  color: var(--text-primary);
  font-family: monospace;
  font-size: 0.75rem;
}

/* Context Menu */
.context-menu {
  position: fixed;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  z-index: 400;
  min-width: 160px;
  padding: 0.375rem 0;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.context-menu.visible {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.context-menu-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: 0.8125rem;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.context-menu-item:hover {
  background: var(--primary);
  color: #fff;
}

.context-menu-item:hover i {
  color: white;
}

.context-menu-item i {
  width: 1rem;
  color: var(--text-muted);
}

.context-menu-divider {
  height: 1px;
  background: var(--border-light);
  margin: 0.375rem 0;
}

/* Selection Actions Bar */
.selection-bar {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(20px);
  transition: all var(--transition-normal);
}

.selection-bar.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.selection-bar-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.selection-bar-text span {
  color: var(--primary);
  font-weight: 700;
}

.selection-bar-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.selection-bar-btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 6px var(--primary-glow);
}

.selection-bar-btn.primary:hover {
  transform: translateY(-1px);
  background: var(--primary-dark);
  box-shadow: 0 4px 10px var(--primary-glow);
}

.selection-bar-btn.secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.selection-bar-btn.secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
}

/* Selected Card State */
.icon-card.selected {
  border-color: var(--primary);
  background: var(--bg-card-hover);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.icon-card.selected::after {
  content: "";
  position: absolute;
  top: 0.375rem;
  left: 0.375rem;
  width: 1rem;
  height: 1rem;
  background: var(--primary);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-size: 0.625rem;
  background-position: center;
  background-repeat: no-repeat;
}

/* Skeleton Loading */
.skeleton {
  background: var(--bg-secondary);
  background-image: linear-gradient(90deg, transparent 0%, var(--border-light) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

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

.skeleton-card {
  height: 100px;
  animation: pulse 1.5s ease-in-out infinite;
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  box-shadow: var(--shadow-lg);
  z-index: 180;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px) scale(0.85);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}
.back-to-top:hover {
  background: var(--primary-dark);
}
.back-to-top:active {
  transform: scale(0.9);
}

/* ========================================
   Category Bar Header (Mobile Toggle)
   ======================================== */
.category-bar-header {
  display: none;
}
.category-toggle-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-family: var(--font-sans);
}
.category-toggle-btn:active {
  background: var(--bg-card-hover);
  transform: scale(0.96);
}
.category-toggle-arrow {
  font-size: 0.65rem;
  transition: transform var(--transition-normal);
}
.category-bar.expanded .category-toggle-arrow {
  transform: rotate(180deg);
}
.category-toggle-text {
  font-size: 0.85rem;
}
.category-quick-row {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  flex: 1;
  min-width: 0;
}
.category-quick-row::-webkit-scrollbar {
  display: none;
}
.category-quick-chip {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
  flex-shrink: 0;
}
.category-quick-chip:active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.category-quick-chip.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.category-quick-chip .count {
  font-size: 0.6rem;
  padding: 0.1rem 0.3rem;
  border-radius: var(--radius-sm);
  background: rgba(0,0,0,0.06);
}
[data-theme="dark"] .category-quick-chip .count {
  background: rgba(255,255,255,0.12);
}
.category-quick-chip.active .count {
  background: rgba(255,255,255,0.22);
}

/* Mobile: collapsed category grid — smooth expand */
#categoryContainer.category-grid-collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding-top: 0;
  padding-bottom: 0;
  margin-top: 0;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
              margin 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.category-bar.expanded #categoryContainer.category-grid-collapsed {
  max-height: 800px;
  opacity: 1;
  margin-top: 0.65rem;
}

/* Category overlay backdrop for mobile */
.category-overlay {
  display: none;
}

/* ========================================
   Responsive Design — 手机端优先
   ======================================== */

/* 平板 — ≤900px */
@media (max-width: 900px) {
  .back-to-top {
    bottom: 1.5rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    font-size: 1rem;
  }
}

/* 小平板 / 横屏手机 — ≤768px */
@media (max-width: 768px) {
  /* --- Category Bar: Collapsible --- */
  .category-bar-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  .category-bar {
    position: sticky;
    top: 76px;
    border-radius: var(--radius-lg);
    padding: 0.6rem 0.75rem;
    z-index: 90;
    transition: box-shadow var(--transition-normal);
  }
  .category-bar.expanded {
    box-shadow: var(--shadow-lg);
  }
  #categoryContainer {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: flex-start;
  }
  #categoryContainer.category-grid-collapsed {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
  }
  .category-bar.expanded #categoryContainer.category-grid-collapsed {
    max-height: 800px;
    opacity: 1;
    margin-top: 0.65rem;
  }
  .category-chip {
    padding: 0.45rem 0.65rem;
    font-size: 0.73rem;
    min-height: 36px;
  }
  /* Hide desktop category grid on mobile by default */
  .category-grid {
    flex-wrap: wrap;
  }
}

/* 手机 — ≤640px */
@media (max-width: 640px) {
  .header {
    position: sticky;
    top: 0;
  }
  .header-content {
    padding: 0.6rem 0.85rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .logo {
    gap: 0.5rem;
  }
  .logo-text {
    font-size: 1.1rem;
  }
  .logo-sub {
    font-size: 0.6rem;
  }
  .logo-icon {
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.2rem;
    border-radius: var(--radius-sm);
  }
  .icon-btn {
    width: 2.25rem;
    height: 2.25rem;
  }
  .search-wrapper {
    order: 3;
    max-width: 100%;
    width: 100%;
    margin-top: 0.5rem;
  }
  .search-input {
    font-size: 0.95rem;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    min-height: 44px;
    border-radius: var(--radius-lg);
  }
  .search-shortcut {
    display: none;
  }
  .search-icon {
    left: 0.85rem;
    font-size: 0.85rem;
  }

  .main {
    padding: 0.75rem;
    gap: 0.75rem;
  }

  /* Category Bar Mobile */
  .category-bar {
    top: 76px;
    padding: 0.5rem 0.65rem;
    border-radius: var(--radius-md);
  }
  .category-bar-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
  }
  .category-toggle-btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.8rem;
    gap: 0.35rem;
    min-height: 40px;
  }
  .category-toggle-text {
    display: none;
  }
  .category-quick-row {
    gap: 0.35rem;
  }
  .category-quick-chip {
    padding: 0.4rem 0.6rem;
    font-size: 0.7rem;
    min-height: 36px;
  }
  #categoryContainer {
    gap: 0.35rem;
  }
  .category-bar.expanded #categoryContainer.category-grid-collapsed {
    max-height: 800px;
    opacity: 1;
    margin-top: 0.55rem;
  }
  .category-chip {
    padding: 0.4rem 0.6rem;
    font-size: 0.7rem;
    min-height: 36px;
  }

  /* Icon Grid — 4列紧凑布局 */
  .icon-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.45rem;
  }
  .icon-card {
    padding: 0.7rem 0.2rem;
    border-radius: var(--radius-md);
  }
  .icon-emoji {
    font-size: 1.55rem;
    margin-bottom: 0.35rem;
  }
  .icon-name {
    font-size: 0.62rem;
    max-width: 90%;
  }
  /* 手机端：操作按钮常显 */
  .icon-actions {
    opacity: 1;
    transform: scale(1) translateY(0);
    top: 4px;
    right: 4px;
  }
  .icon-action-btn {
    width: 1.65rem;
    height: 1.65rem;
    font-size: 0.6rem;
  }

  /* Modal */
  .modal {
    width: 92%;
    padding: 1.5rem 1rem;
    border-radius: var(--radius-xl);
  }
  .modal-emoji {
    font-size: 3.5rem;
  }
  .modal-name {
    font-size: 1.15rem;
  }
  .modal-meta-item {
    font-size: 0.65rem;
    padding: 0.3rem 0.6rem;
  }
  .modal-btn {
    padding: 0.65rem 1.1rem;
    font-size: 0.85rem;
    min-height: 44px;
    flex: 1;
  }
  .modal-actions {
    gap: 0.5rem;
  }

  /* Pagination */
  .pagination {
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 0;
  }
  .pagination-info {
    text-align: center;
    font-size: 0.78rem;
  }
  .pagination-btn {
    padding: 0.55rem 0.9rem;
    font-size: 0.85rem;
    min-height: 42px;
  }
  .page-info {
    font-size: 0.78rem;
  }

  /* Toast — 底部居中 */
  .toast {
    bottom: 1.5rem;
    left: 1rem;
    right: 1rem;
    width: auto;
    max-width: 320px;
    margin: 0 auto;
    transform: translateY(120px);
    border-radius: var(--radius-xl);
    justify-content: center;
  }
  .toast.visible {
    transform: translateY(0);
  }

  /* Selection Bar */
  .selection-bar {
    left: 0.6rem;
    right: 0.6rem;
    bottom: 1rem;
    padding: 0.6rem 0.85rem;
    gap: 0.5rem;
    border-radius: var(--radius-md);
    transform: translateY(20px);
  }
  .selection-bar.visible {
    transform: translateY(0);
  }
  .selection-bar-text {
    font-size: 0.78rem;
  }
  .selection-bar-btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.78rem;
    min-height: 40px;
  }

  /* Keyboard Shortcuts */
  .shortcuts-hint {
    display: none;
  }
  .shortcuts-content {
    max-width: 100%;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: 1.5rem 1rem;
  }
  .shortcuts-panel {
    align-items: flex-end;
  }

  /* Context Menu — 适配小屏 */
  .context-menu {
    min-width: 140px;
  }
  .context-menu-item {
    padding: 0.55rem 0.8rem;
    font-size: 0.8rem;
    min-height: 40px;
  }

  /* Back to Top */
  .back-to-top {
    bottom: 1.25rem;
    right: 0.85rem;
    width: 42px;
    height: 42px;
    font-size: 0.95rem;
  }

  /* Footer */
  .footer {
    padding: 1.25rem 1rem;
  }
  .footer-text {
    font-size: 0.78rem;
  }
}

/* 小手机 — ≤400px */
@media (max-width: 400px) {
  .header-content {
    padding: 0.5rem 0.65rem;
  }
  .logo-icon {
    width: 2rem;
    height: 2rem;
    font-size: 1rem;
  }
  .logo-text {
    font-size: 0.95rem;
  }
  .icon-btn {
    width: 2rem;
    height: 2rem;
    font-size: 0.8rem;
  }
  .search-input {
    font-size: 0.9rem;
    padding: 0.55rem 0.85rem 0.55rem 2.25rem;
    min-height: 40px;
  }

  .main {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .category-bar {
    top: 72px;
    padding: 0.4rem 0.5rem;
  }
  .category-toggle-btn {
    padding: 0.4rem 0.65rem;
    font-size: 0.75rem;
    min-height: 36px;
  }
  .category-quick-chip {
    padding: 0.35rem 0.5rem;
    font-size: 0.65rem;
    min-height: 32px;
  }
  .category-chip {
    padding: 0.35rem 0.5rem;
    font-size: 0.65rem;
    min-height: 32px;
  }

  /* Icon Grid — 4列更紧凑 */
  .icon-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
  }
  .icon-card {
    padding: 0.55rem 0.1rem;
    border-radius: var(--radius-sm);
  }
  .icon-emoji {
    font-size: 1.3rem;
    margin-bottom: 0.25rem;
  }
  .icon-name {
    font-size: 0.55rem;
  }
  .icon-action-btn {
    width: 1.45rem;
    height: 1.45rem;
    font-size: 0.55rem;
  }
  .icon-actions {
    top: 3px;
    right: 3px;
  }

  .modal {
    width: 94%;
    padding: 1.25rem 0.75rem;
  }
  .modal-emoji {
    font-size: 3rem;
  }
  .modal-name {
    font-size: 1rem;
  }

  .selection-bar {
    left: 0.4rem;
    right: 0.4rem;
    bottom: 0.6rem;
    padding: 0.5rem 0.65rem;
    gap: 0.35rem;
    transform: translateY(20px);
  }
  .selection-bar.visible {
    transform: translateY(0);
  }

  .back-to-top {
    bottom: 1rem;
    right: 0.65rem;
    width: 38px;
    height: 38px;
    font-size: 0.85rem;
  }
}

/* Selection highlight — 主题色淡淡的染色 */
::selection {
  background: var(--primary-glow);
  color: var(--accent-ink);
}

[data-theme="dark"] ::selection {
  background: rgba(251, 146, 60, 0.25);
  color: var(--text-primary);
}
/* === Favorites Star === */
.fav-star {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  opacity: 0;
  transition: all var(--transition-fast);
  z-index: 5;
}
.icon-card:hover .fav-star { opacity: 1; }
.fav-star.active { opacity: 1; color: #f59e0b; }
.fav-star:hover { color: #f59e0b; transform: scale(1.2); }

/* 触控设备常显操作按钮 */
@media (hover: none) and (pointer: coarse) {
  .fav-star { opacity: 1; }
  .icon-actions {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* === Shortcuts Panel === */
.shortcuts-panel {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(28, 25, 23, 0.55);
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
}
.shortcuts-panel.show { display: flex; }
.shortcuts-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow-xl);
}
.shortcuts-content h3 {
  margin-bottom: 1rem;
  font-size: 1.125rem;
  color: var(--text-primary);
}
.shortcut-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.875rem;
}
.shortcut-key {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.125rem 0.5rem;
  font-family: monospace;
  font-size: 0.75rem;
}
.shortcuts-close {
  margin-top: 1rem;
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}
.shortcuts-close:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* === Page Total === */
.page-total {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin: 0 0.25rem;
}