/* ============================================
   拾光 · 网址导航 — Premium Apple-style Design
   ============================================ */

/* --- Custom Properties --- */
:root {
  --bg-primary: #f2f2f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8e8ed;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-strong: rgba(255, 255, 255, 0.82);
  --bg-search: rgba(255, 255, 255, 0.92);
  --bg-tag: rgba(0, 0, 0, 0.04);
  --bg-tag-hover: rgba(0, 0, 0, 0.07);
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --text-link: #0071e3;
  --border-color: rgba(0, 0, 0, 0.06);
  --border-card: rgba(0, 0, 0, 0.06);
  --border-search: rgba(0, 0, 0, 0.1);
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.1);
  --accent: #6366f1;
  --accent-rgb: 99, 102, 241;
  --accent-secondary: #3b82f6;
  --accent-light: rgba(99, 102, 241, 0.08);
  --accent-gradient: linear-gradient(135deg, #6366f1, #3b82f6);
  --accent-gradient-warm: linear-gradient(135deg, #f59e0b, #ef4444);
  --nav-bg: rgba(242, 242, 247, 0.78);
  --hero-bg: linear-gradient(180deg, #dde4ff 0%, #ede9fe 40%, #f2f2f7 100%);
  --icon-bg: linear-gradient(145deg, #f8f8fa, #e8e8ed);
  --divider: rgba(0, 0, 0, 0.05);
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --badge-bg: rgba(99, 102, 241, 0.08);
  --badge-text: #6366f1;
  --hot-card-bg: rgba(255, 255, 255, 0.6);
  --hot-card-border: rgba(255, 255, 255, 0.8);
  --hot-card-shadow: 0 2px 12px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(0, 0, 0, 0.03);
  --hot-card-hover-shadow: 0 8px 24px rgba(99, 102, 241, 0.12), 0 0 0 1px rgba(99, 102, 241, 0.08);
  --hot-container-bg: linear-gradient(135deg, rgba(99, 102, 241, 0.03) 0%, rgba(59, 130, 246, 0.03) 50%, rgba(236, 72, 153, 0.02) 100%);
  --hot-container-border: rgba(99, 102, 241, 0.06);
  --orb-1: rgba(99, 102, 241, 0.12);
  --orb-2: rgba(236, 72, 153, 0.08);
  --orb-3: rgba(59, 130, 246, 0.08);
  --filter-bg: rgba(242, 242, 247, 0.88);
  --gradient-text: linear-gradient(135deg, #1d1d1f 10%, #6366f1 55%, #3b82f6 90%);
  --section-glow: rgba(99, 102, 241, 0.04);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display',
    'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: 'Noto Serif SC', 'Songti SC', Georgia, serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Radius */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 0.15s;
  --dur-base: 0.25s;
  --dur-slow: 0.4s;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 56px;
}

/* --- Dark Mode --- */
[data-theme='dark'] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #18181b;
  --bg-tertiary: #27272a;
  --bg-card: rgba(39, 39, 42, 0.5);
  --bg-card-hover: rgba(55, 55, 60, 0.72);
  --bg-glass: rgba(24, 24, 27, 0.55);
  --bg-glass-strong: rgba(24, 24, 27, 0.85);
  --bg-search: rgba(39, 39, 42, 0.92);
  --bg-tag: rgba(255, 255, 255, 0.06);
  --bg-tag-hover: rgba(255, 255, 255, 0.1);
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --text-link: #60a5fa;
  --border-color: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.06);
  --border-search: rgba(255, 255, 255, 0.1);
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.35);
  --accent: #818cf8;
  --accent-rgb: 129, 140, 248;
  --accent-secondary: #60a5fa;
  --accent-light: rgba(129, 140, 248, 0.1);
  --accent-gradient: linear-gradient(135deg, #818cf8, #60a5fa);
  --accent-gradient-warm: linear-gradient(135deg, #fbbf24, #f87171);
  --nav-bg: rgba(10, 10, 15, 0.82);
  --hero-bg: linear-gradient(180deg, #0f0a2e 0%, #130d28 40%, #0a0a0f 100%);
  --icon-bg: linear-gradient(145deg, #27272a, #3f3f46);
  --divider: rgba(255, 255, 255, 0.06);
  --scrollbar-thumb: rgba(255, 255, 255, 0.12);
  --badge-bg: rgba(129, 140, 248, 0.1);
  --badge-text: #818cf8;
  --hot-card-bg: rgba(39, 39, 42, 0.45);
  --hot-card-border: rgba(255, 255, 255, 0.06);
  --hot-card-shadow: 0 2px 12px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.04);
  --hot-card-hover-shadow: 0 8px 24px rgba(129, 140, 248, 0.15), 0 0 0 1px rgba(129, 140, 248, 0.12);
  --hot-container-bg: linear-gradient(135deg, rgba(129, 140, 248, 0.04) 0%, rgba(96, 165, 250, 0.03) 50%, rgba(236, 72, 153, 0.02) 100%);
  --hot-container-border: rgba(129, 140, 248, 0.08);
  --orb-1: rgba(99, 102, 241, 0.18);
  --orb-2: rgba(236, 72, 153, 0.1);
  --orb-3: rgba(59, 130, 246, 0.1);
  --filter-bg: rgba(10, 10, 15, 0.9);
  --gradient-text: linear-gradient(135deg, #f4f4f5 10%, #818cf8 55%, #60a5fa 90%);
  --section-glow: rgba(99, 102, 241, 0.03);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-padding-top: calc(var(--nav-height) + 60px);
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100dvh;
  transition: background var(--dur-slow) var(--ease-out), color var(--dur-slow) var(--ease-out);
  overflow-x: hidden;
  position: relative;
}

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

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

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

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

::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}

/* ============================
   Background Orbs
   ============================ */
.bg-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.7;
  animation: orbFloat 20s ease-in-out infinite;
}

.bg-orb-1 {
  width: 500px;
  height: 500px;
  background: var(--orb-1);
  top: -120px;
  right: -100px;
  animation-duration: 25s;
}

.bg-orb-2 {
  width: 400px;
  height: 400px;
  background: var(--orb-2);
  bottom: 15%;
  left: -80px;
  animation-duration: 30s;
  animation-delay: -5s;
}

.bg-orb-3 {
  width: 350px;
  height: 350px;
  background: var(--orb-3);
  top: 35%;
  right: 8%;
  animation-duration: 22s;
  animation-delay: -10s;
}

@keyframes orbFloat {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  25% {
    transform: translate(30px, -40px) scale(1.05);
  }

  50% {
    transform: translate(-20px, 20px) scale(0.95);
  }

  75% {
    transform: translate(40px, 30px) scale(1.02);
  }
}

/* ============================
   Top Navigation
   ============================ */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--border-color);
  transition: background var(--dur-slow) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}

.top-nav.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.logo-mark svg {
  width: 30px;
  height: 30px;
  display: block;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--dur-fast) var(--ease-out);
  cursor: pointer;
}

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

.nav-link.active {
  color: var(--accent);
  background: var(--accent-light);
}

.theme-toggle {
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tag);
  transition: background var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-spring);
}

.theme-toggle:hover {
  background: var(--bg-tag-hover);
  transform: scale(1.08);
}

.theme-toggle:active {
  transform: scale(0.92);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  position: absolute;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}

.icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme='dark'] .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme='dark'] .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

/* ============================
   Hero Section
   ============================ */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: var(--nav-height);
}

.hero-section {
  background: var(--hero-bg);
  padding: var(--space-xl) var(--space-lg) var(--space-xl);
  position: relative;
  text-align: center;
  transition: background var(--dur-slow) var(--ease-out);
}

.hero-fade {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to bottom, transparent, var(--bg-primary));
  pointer-events: none;
}

.hero-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  animation: fadeInDown 0.6s var(--ease-out);
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.0rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.15;
  margin-bottom: var(--space-sm);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.6s var(--ease-out) 0.1s backwards;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 0;
  letter-spacing: -0.01em;
  animation: fadeInUp 0.6s var(--ease-out) 0.2s backwards;
}

/* ============================
   Search Float Layer
   ============================ */
.search-float {
  position: relative;
  z-index: 200;
  margin-top: -20px;
  padding: 0 var(--space-lg);
  pointer-events: none;
}

.search-float-inner {
  max-width: 680px;
  margin: 0 auto;
  pointer-events: auto;
}

.search-wrapper {
  position: relative;
}

.search-container {
  display: flex;
  align-items: center;
  background: var(--bg-search);
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--border-search);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: box-shadow var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

.search-container:focus-within {
  border-color: rgba(var(--accent-rgb), 0.4);
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.1), var(--shadow-lg);
  transform: translateY(-1px);
}

/* Engine Selector */
.search-engine-selector {
  position: relative;
}

.engine-current {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 16px 12px 16px 18px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  border-right: 1px solid var(--border-color);
  border-radius: var(--radius-xl) 0 0 var(--radius-xl);
  transition: color var(--dur-fast), background var(--dur-fast);
}

.engine-current:hover {
  color: var(--text-primary);
  background: var(--bg-tag);
}

.engine-current img {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  object-fit: contain;
}

.engine-arrow {
  transition: transform var(--dur-fast) var(--ease-out);
}

.engine-current.open .engine-arrow {
  transform: rotate(180deg);
}

/* Dropdown — above everything */
.engine-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 4px;
  min-width: 220px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.96);
  transition: all var(--dur-base) var(--ease-out);
  overflow: hidden;
  padding: 4px;
}

.engine-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.engine-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast);
  width: 100%;
  text-align: left;
}

.engine-option:hover {
  background: var(--bg-tag);
}

.engine-option.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.engine-option img {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  object-fit: contain;
}

.engine-option-name {
  flex: 1;
}

.engine-check {
  color: var(--accent);
  opacity: 0;
}

.engine-option.active .engine-check {
  opacity: 1;
}

/* Search Input */
.search-input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
}

.search-input {
  flex: 1;
  padding: 16px 0 16px 18px;
  font-size: 1rem;
  color: var(--text-primary);
}

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

.search-btn {
  padding: 12px 18px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  transition: color var(--dur-fast), transform var(--dur-fast) var(--ease-spring);
}

.search-btn:hover {
  color: var(--accent);
  transform: scale(1.15);
}

/* ============================
   Hot Sites Section
   ============================ */
.hot-section {
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  position: relative;
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.section-title-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-icon {
  font-size: 1.3rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

.section-desc {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* Hot Grid Container — glassmorphism card */
.hot-grid-container {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: var(--space-lg) var(--space-md);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  position: relative;
  overflow: hidden;
}

.hot-grid-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(var(--accent-rgb), 0.15), transparent);
}

/* Hot Grid */
.hot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: var(--space-md) var(--space-sm);
  justify-items: center;
}

.hot-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  text-decoration: none;
  padding: var(--space-xs);
  border-radius: var(--radius-lg);
  transition: all var(--dur-base) var(--ease-out);
  width: 100%;
  max-width: 80px;
}

.hot-item:hover {
  transform: translateY(-6px) scale(1.02);
}

.hot-item:active {
  transform: translateY(-2px) scale(0.97);
}

.hot-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--hot-card-bg);
  border: 1px solid var(--hot-card-border);
  box-shadow: var(--hot-card-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: box-shadow var(--dur-base), border-color var(--dur-base), transform var(--dur-base) var(--ease-spring);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hot-item:hover .hot-icon {
  box-shadow: var(--hot-card-hover-shadow);
  border-color: rgba(var(--accent-rgb), 0.2);
  transform: scale(1.06);
}

.hot-icon img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: contain;
}

.hot-icon .hot-fallback {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hot-name {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.2;
  max-width: 76px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--dur-fast);
}

.hot-item:hover .hot-name {
  color: var(--accent);
}

/* ============================
   Section Divider
   ============================ */
.section-divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: var(--space-sm) auto var(--space-sm);
  padding: 0 var(--space-lg);
}

.divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--divider), transparent);
}

.divider-diamond {
  font-size: 0.45rem;
  color: var(--accent);
  opacity: 0.4;
  letter-spacing: 2px;
}

/* ============================
   Sites Anchor (scroll target)
   ============================ */
#sitesAnchor {
  scroll-margin-top: calc(var(--nav-height) + 8px);
}

/* ============================
   Filter Bar
   ============================ */
.filter-bar {
  position: sticky;
  top: var(--nav-height);
  z-index: 50;
  background: var(--filter-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--border-color);
  transition: background var(--dur-slow) var(--ease-out);
  margin-top: var(--space-sm);
}

.filter-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.filter-inner::-webkit-scrollbar {
  display: none;
}

.filter-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 16px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tag);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: all var(--dur-fast) var(--ease-out);
  flex-shrink: 0;
}

.filter-chip svg {
  flex-shrink: 0;
}

.filter-chip:hover {
  background: var(--bg-tag-hover);
  color: var(--text-primary);
}

.filter-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.3);
}

/* ============================
   Sites Section
   ============================ */
.sites-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-2xl);
}

.category-group {
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.5s var(--ease-out) backwards;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--divider);
}

.category-emoji {
  font-size: 1.3rem;
  line-height: 1;
}

.category-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.category-count {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-sm);
}

.site-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: all var(--dur-base) var(--ease-out);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.site-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--dur-base);
}

.site-card:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
  border-color: rgba(var(--accent-rgb), 0.12);
}

.site-card:hover::before {
  opacity: 1;
}

.site-card:active {
  transform: translateY(-1px) scale(0.995);
}

.card-header-line {
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon img {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  object-fit: contain;
}

.card-icon .icon-fallback {
  font-size: 0.9rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card-info {
  display: flex;
  flex-direction: column;
}

.card-name {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-name .external-icon {
  width: 12px;
  height: 12px;
  color: var(--text-tertiary);
  flex-shrink: 0;
  opacity: 0;
  transform: translateX(-4px);
  transition: all var(--dur-fast) var(--ease-out);
}

.site-card:hover .card-name .external-icon {
  opacity: 1;
  transform: translateX(0);
}

.card-desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================
   Footer
   ============================ */
.site-footer {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  border-top: 1px solid var(--divider);
  background: linear-gradient(to top, var(--section-glow), transparent);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-text {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* ============================
   Back to Top
   ============================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--dur-base) 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: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(var(--accent-rgb), 0.35);
}

/* ============================
   No Results
   ============================ */
.no-results {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  color: var(--text-tertiary);
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.no-results-text {
  font-size: 1.05rem;
  font-weight: 500;
}

/* ============================
   Animations
   ============================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }

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

.category-group:nth-child(1) {
  animation-delay: 0s;
}

.category-group:nth-child(2) {
  animation-delay: 0.06s;
}

.category-group:nth-child(3) {
  animation-delay: 0.12s;
}

.category-group:nth-child(4) {
  animation-delay: 0.18s;
}

.category-group:nth-child(5) {
  animation-delay: 0.24s;
}

.category-group:nth-child(6) {
  animation-delay: 0.30s;
}

.category-group:nth-child(7) {
  animation-delay: 0.36s;
}

.category-group:nth-child(8) {
  animation-delay: 0.42s;
}

/* ============================
   Responsive – Tablet
   ============================ */
@media (max-width:768px) {
  :root {
    --nav-height: 50px;
  }

  .hero-section {
    padding: var(--space-2xl) var(--space-md) var(--space-3xl);
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .search-float {
    margin-top: -24px;
    padding: 0 var(--space-md);
  }

  .search-container {
    border-radius: var(--radius-lg);
  }

  .engine-current {
    padding: 14px 10px 14px 14px;
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  }

  .engine-current span {
    display: none;
  }

  .search-input {
    padding: 14px 0 14px 14px;
    font-size: 0.95rem;
  }

  .hot-section {
    padding: var(--space-xl) var(--space-md) var(--space-lg);
  }

  .hot-grid-container {
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-xl);
  }

  .hot-grid {
    grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
    gap: var(--space-md) var(--space-sm);
  }

  .hot-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
  }

  .hot-icon img {
    width: 28px;
    height: 28px;
  }

  .hot-name {
    font-size: 0.68rem;
    max-width: 68px;
  }

  .cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-sm);
  }

  .site-card {
    padding: var(--space-md);
  }

  .card-icon {
    width: 42px;
    height: 42px;
  }

  .card-icon img {
    width: 24px;
    height: 24px;
  }

  .sites-section {
    padding: var(--space-lg) var(--space-md) var(--space-2xl);
  }

  .filter-inner {
    padding: var(--space-sm) var(--space-md);
  }

  .nav-link span {
    display: none;
  }

  .nav-link {
    padding: 7px 10px;
  }

  .back-to-top {
    bottom: 24px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  .bg-orb-1 {
    width: 300px;
    height: 300px;
  }

  .bg-orb-2 {
    width: 250px;
    height: 250px;
  }

  .bg-orb-3 {
    width: 200px;
    height: 200px;
  }
}

/* ============================
   Responsive – Mobile
   ============================ */
@media (max-width:480px) {
  .hero-section {
    padding: var(--space-xl) var(--space-md) var(--space-2xl);
  }

  .hero-title {
    font-size: 1.7rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .hot-grid {
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 12px 6px;
  }

  .hot-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
  }

  .hot-icon img {
    width: 26px;
    height: 26px;
  }

  .hot-name {
    font-size: 0.65rem;
    max-width: 60px;
  }

  .hot-grid-container {
    padding: var(--space-md) var(--space-sm);
  }

  .category-header {
    margin-bottom: var(--space-md);
  }

  .category-title {
    font-size: 1.05rem;
  }

  .engine-dropdown {
    min-width: 170px;
  }
}

/* iOS Safe Area */
@supports (padding:env(safe-area-inset-bottom)) {
  .site-footer {
    padding-bottom: calc(var(--space-2xl) + env(safe-area-inset-bottom));
  }

  .back-to-top {
    bottom: calc(32px + env(safe-area-inset-bottom));
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion:reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .bg-orb {
    animation: none !important;
  }
}