/* ============================================
   AI Navigator — Design System & Styles
   ============================================ */

/* === CSS Custom Properties (Design Tokens) === */
:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --header-height: 64px;
  --max-width: 1200px;
  --card-radius: 14px;
  --tag-radius: 100px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 0.15s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;
}

/* Dark Theme (default) */
[data-theme="dark"] {
  --bg-primary: #0A0F1C;
  --bg-secondary: #0F172A;
  --bg-card: #1E293B;
  --bg-card-hover: #253348;
  --bg-input: #0F172A;
  --bg-tag: #1E293B;
  --bg-tag-active: #22D3EE;

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --text-tag-active: #0A0F1C;

  --accent: #22D3EE;
  --accent-glow: rgba(34, 211, 238, 0.15);
  --accent-border: rgba(34, 211, 238, 0.12);

  --border-subtle: rgba(148, 163, 184, 0.08);
  --border-card: rgba(34, 211, 238, 0.08);

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(34, 211, 238, 0.08);

  --header-bg: rgba(10, 15, 28, 0.82);
  --hero-gradient: linear-gradient(180deg, #0F172A 0%, #0A0F1C 100%);
  --footer-bg: #0F172A;
  --scrollbar-track: #0F172A;
  --scrollbar-thumb: #334155;
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F1F5F9;
  --bg-input: #F1F5F9;
  --bg-tag: #F1F5F9;
  --bg-tag-active: #0891B2;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-tag-active: #FFFFFF;

  --accent: #0891B2;
  --accent-glow: rgba(8, 145, 178, 0.1);
  --accent-border: rgba(8, 145, 178, 0.15);

  --border-subtle: rgba(15, 23, 42, 0.06);
  --border-card: rgba(8, 145, 178, 0.1);

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 32px rgba(8, 145, 178, 0.06);

  --header-bg: rgba(248, 250, 252, 0.85);
  --hero-gradient: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  --footer-bg: #F1F5F9;
  --scrollbar-track: #F1F5F9;
  --scrollbar-thumb: #CBD5E1;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}

a { color: inherit; text-decoration: none; }
button { border: none; cursor: pointer; background: transparent; font-family: inherit; }
input { font-family: inherit; }

/* === Utility: Animate on scroll === */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.header.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.15);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--text-primary);
  transition: opacity var(--duration-fast);
  flex-shrink: 0;
}
.logo:hover { opacity: 0.8; }
.logo-icon { font-size: 24px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 6px 16px;
  border-radius: var(--tag-radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}
.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-tag);
}
.nav-link.active {
  color: var(--accent);
  background: var(--accent-glow);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}
.theme-toggle:hover {
  background: var(--bg-tag);
  color: var(--accent);
}
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  padding: calc(var(--header-height) + 56px) 24px 40px;
  text-align: center;
  background: var(--hero-gradient);
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero-emoji {
  font-size: 40px;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 480px;
}

/* Search Bar */
.search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 520px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-glow);
}
.search-bar:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-glow);
}

.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 15px;
  color: var(--text-primary);
}
.search-input::placeholder {
  color: var(--text-muted);
}

.search-kbd {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  flex-shrink: 0;
}

/* Stats Row */
.stats-row {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-top: 4px;
}

.stat-item {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 24px;
  background: var(--border-subtle);
}

/* ============================================
   CATEGORY TAGS
   ============================================ */
.category-tags {
  position: sticky;
  top: var(--header-height);
  z-index: 50;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--duration-normal) var(--ease-out);
}

.tags-scroll {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tags-scroll::-webkit-scrollbar { display: none; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--tag-radius);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-secondary);
  background: var(--bg-tag);
  border: 1px solid transparent;
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
}
.tag:hover {
  color: var(--text-primary);
  background: var(--bg-card);
  border-color: var(--border-card);
}
.tag.active {
  color: var(--text-tag-active);
  background: var(--bg-tag-active);
  font-weight: 600;
  border-color: transparent;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* Category Section */
.category-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.category-title {
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 4px 10px;
  background: var(--bg-tag);
  border-radius: var(--tag-radius);
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* Site Card */
.site-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--card-radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-card);
}
.site-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--accent-border);
}
.site-card:hover .card-preview-overlay {
  opacity: 1;
}

/* Card Preview Image */
.card-preview {
  position: relative;
  width: 100%;
  height: 170px;
  overflow: hidden;
  background: var(--bg-secondary);
}

.card-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}
.site-card:hover .card-preview img {
  transform: scale(1.05);
}

.card-preview-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12px;
}
.card-preview-placeholder .placeholder-icon {
  font-size: 32px;
  opacity: 0.4;
}

.card-preview-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.card-preview-overlay span {
  padding: 8px 20px;
  background: var(--accent);
  color: var(--text-tag-active);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--tag-radius);
}

/* Card Info */
.card-info {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.card-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-emoji {
  font-size: 20px;
}

.card-name {
  font-size: 15px;
  font-weight: 600;
}

.card-arrow {
  color: var(--text-muted);
  transition: all var(--duration-fast);
  flex-shrink: 0;
}
.site-card:hover .card-arrow {
  color: var(--accent);
  transform: translate(2px, -2px);
}

.card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}
.empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
}
.empty-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}
.empty-desc {
  color: var(--text-secondary);
  font-size: 14px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--footer-bg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  transition: background var(--duration-normal) var(--ease-out);
}

.footer-divider {
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  border-radius: 1px;
}

.footer-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.7;
}

/* ============================================
   SETTINGS BUTTON
   ============================================ */
.settings-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}
.settings-btn:hover {
  background: var(--bg-tag);
  color: var(--accent);
}
.settings-btn:hover svg {
  transform: rotate(45deg);
}
.settings-btn svg {
  transition: transform var(--duration-normal) var(--ease-out);
}

/* ============================================
   SETTINGS MODAL
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}
.modal-overlay.open .modal-card {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
  transform: translateY(16px) scale(0.97);
  opacity: 0;
  transition: all var(--duration-normal) var(--ease-spring);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 28px 0;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--duration-fast);
}
.modal-close:hover {
  background: var(--bg-tag);
  color: var(--text-primary);
}

.modal-body {
  padding: 20px 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.setting-group {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 4px;
}
.setting-group:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
}

.setting-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

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

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

.setting-sub {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0 14px 0;
  animation: fadeSlideDown 0.2s var(--ease-out);
}

@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.setting-sub-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
  flex-shrink: 0;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--duration-normal) var(--ease-spring);
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
  border-color: var(--accent);
}
.toggle-switch input:checked + .toggle-slider::before {
  left: calc(100% - 23px);
  background: #fff;
}

/* Stepper Control */
.stepper {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.stepper-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
  background: var(--bg-input);
  color: var(--text-secondary);
  transition: all var(--duration-fast);
}
.stepper-btn:hover {
  background: var(--accent-glow);
  color: var(--accent);
}
.stepper-btn:active {
  transform: scale(0.92);
}

.stepper-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  min-width: 28px;
  text-align: center;
}

.stepper-unit {
  font-size: 12px;
  color: var(--text-muted);
  margin-right: 2px;
}

/* Modal Footer */
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px 24px;
  gap: 12px;
}

.refresh-status {
  font-size: 12px;
  color: var(--text-muted);
  flex: 1;
}
.refresh-status .status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 3px;
  background: #22C55E;
  margin-right: 6px;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.modal-save-btn {
  padding: 10px 28px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--text-tag-active);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}
.modal-save-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}
.modal-save-btn:active {
  transform: translateY(0);
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 90;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--accent);
  color: var(--text-tag-active);
  transform: translateY(-2px);
}

/* ============================================
   LOADING SKELETON
   ============================================ */
.skeleton-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--card-radius);
  overflow: hidden;
}
.skeleton-preview {
  width: 100%;
  height: 170px;
  background: linear-gradient(110deg, var(--bg-secondary) 8%, var(--bg-card) 18%, var(--bg-secondary) 33%);
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}
.skeleton-info {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.skeleton-line {
  height: 14px;
  border-radius: 7px;
  background: linear-gradient(110deg, var(--bg-secondary) 8%, var(--bg-card) 18%, var(--bg-secondary) 33%);
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}
.skeleton-line.short { width: 60%; }
.skeleton-line.medium { width: 80%; }

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

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    flex-direction: column;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 4px;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 16px;
    border-radius: 12px;
    width: 100%;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero {
    padding: calc(var(--header-height) + 40px) 20px 32px;
  }
  .hero-title {
    font-size: 28px;
    flex-direction: column;
    gap: 8px;
  }
  .hero-emoji {
    font-size: 32px;
  }
  .hero-subtitle {
    font-size: 14px;
  }

  .search-bar {
    padding: 12px 16px;
  }
  .search-kbd { display: none; }

  .stats-row {
    gap: 20px;
  }
  .stat-num {
    font-size: 22px;
  }

  .tags-scroll {
    padding: 10px 16px;
  }

  .content {
    padding: 24px 16px 48px;
    gap: 36px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card-preview {
    height: 160px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  .category-title { font-size: 18px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   ANIMATIONS (staggered card entrance)
   ============================================ */
.site-card {
  animation: cardEnter var(--duration-slow) var(--ease-out) both;
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}