/* =========================================================
   VARIABLES & DARK MODE
   ========================================================= */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #10b981;
  --accent-dark: #059669;

  --bg: #f8fafc;
  --bg-alt: #ffffff;
  --bg-soft: #f1f5f9;
  --surface: #ffffff;
  --surface-alt: #f8fafc;

  --text: #0f172a;
  --text-dim: #475569;
  --text-mute: #94a3b8;

  --border: #e2e8f0;
  --border-dark: #cbd5e1;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.06);
  --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.08);
  --shadow-xl: 0 20px 40px -10px rgb(0 0 0 / 0.15);

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --cat-color: var(--primary);

  --header-h: 70px;

  --trans: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --primary-light: #1e3a8a;
  --accent: #34d399;

  --bg: #0b1220;
  --bg-alt: #111827;
  --bg-soft: #1e293b;
  --surface: #111827;
  --surface-alt: #0f1724;

  --text: #f1f5f9;
  --text-dim: #cbd5e1;
  --text-mute: #64748b;

  --border: #1f2937;
  --border-dark: #334155;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 40px -10px rgb(0 0 0 / 0.6);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.3s var(--trans), color 0.3s var(--trans);
  min-height: 100vh;
  overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

a { color: var(--primary); text-decoration: none; transition: all .2s; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; color: var(--text); }

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s var(--trans);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--primary) 30%, transparent);
}
.logo em { color: var(--primary); font-style: normal; font-weight: 800; }

.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: flex-end; margin-right: 10px; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: inherit;
  transition: all .2s;
}
.nav-link:hover { background: var(--bg-soft); color: var(--text); }
.tiny { font-size: 0.7rem; transition: transform .2s; }
.nav-dropdown.open .tiny { transform: rotate(180deg); }

.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  min-width: 280px;
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all .2s var(--trans);
}
@media (min-width: 701px) {
  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown.open .nav-dropdown-menu {
    opacity: 1; visibility: visible; transform: translateY(0);
  }
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text);
  transition: all .15s;
}
.dropdown-item:hover { background: var(--bg-soft); color: var(--text); }
.dropdown-item > i { width: 20px; text-align: center; font-size: 1.05rem; }
.dd-name { font-weight: 600; font-size: 0.95rem; }
.dd-count { font-size: 0.78rem; color: var(--text-mute); }

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

.theme-toggle {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text);
  transition: all .2s;
  position: relative;
  overflow: hidden;
}
.theme-toggle:hover { border-color: var(--primary); color: var(--primary); transform: rotate(15deg); }
.theme-icon-dark, .theme-icon-light {
  position: absolute;
  transition: all .3s var(--trans);
}
[data-theme="light"] .theme-icon-dark,
:root:not([data-theme="dark"]) .theme-icon-dark { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="light"] .theme-icon-light,
:root:not([data-theme="dark"]) .theme-icon-light { opacity: 0; transform: scale(0.5) rotate(90deg); }
[data-theme="dark"] .theme-icon-dark { opacity: 0; transform: scale(0.5) rotate(-90deg); }
[data-theme="dark"] .theme-icon-light { opacity: 1; transform: scale(1) rotate(0); color: #fbbf24; }

.burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  width: 40px; height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all .2s var(--trans);
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   HERO
   ========================================================= */
.hero {
  padding: 80px 0 120px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #eef2ff 0%, #f0f9ff 50%, #ecfdf5 100%);
}
[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #0c1a3a 0%, #0a1c2e 50%, #0a2018 100%);
}

.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: blobFloat 15s ease-in-out infinite;
}
[data-theme="dark"] .hero-blob { opacity: 0.35; }
.blob-1 {
  width: 400px; height: 400px;
  background: #3b82f6;
  top: -100px; left: -80px;
}
.blob-2 {
  width: 350px; height: 350px;
  background: #10b981;
  top: 20%; right: -100px;
  animation-delay: -5s;
}
.blob-3 {
  width: 300px; height: 300px;
  background: #f59e0b;
  bottom: 0; left: 30%;
  animation-delay: -10s;
}
@keyframes blobFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.1); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

.hero-content {
  position: relative;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 24px;
  animation: fadeInDown .6s var(--trans);
}
.hero-badge i { color: #f59e0b; }

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 20px;
  letter-spacing: -0.03em;
  font-weight: 800;
  animation: fadeInUp .6s var(--trans);
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle-text {
  color: var(--text);
  font-weight: 700;
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 36px;
  animation: fadeInUp .6s .1s var(--trans) both;
}

.search-bar {
  max-width: 640px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 6px 6px 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: all .2s;
  animation: fadeInUp .6s .2s var(--trans) both;
}
.search-bar:focus-within {
  box-shadow: var(--shadow-xl), 0 0 0 4px color-mix(in srgb, var(--primary) 20%, transparent);
  border-color: var(--primary);
  transform: translateY(-2px);
}
.search-bar i.fa-magnifying-glass { color: var(--text-mute); font-size: 1.05rem; }
.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1rem;
  padding: 12px 0;
  background: transparent;
  font-family: inherit;
  color: var(--text);
  min-width: 0;
}
.search-bar input::placeholder { color: var(--text-mute); }
.search-bar button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
  white-space: nowrap;
}
.search-bar button:hover { background: var(--primary-dark); transform: scale(1.05); }

.search-results {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  max-height: 400px;
  overflow-y: auto;
  display: none;
  text-align: left;
  z-index: 50;
}
.search-results.open { display: block; animation: fadeInDown .2s var(--trans); }
.search-result-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .15s;
}
.search-result-item:hover { background: var(--bg-soft); }
.search-result-item:last-child { border-bottom: none; }
.search-result-item i { font-size: 1.2rem; }
.search-result-item .name { font-weight: 600; color: var(--text); font-size: 0.95rem; }
.search-result-item .desc { font-size: 0.82rem; color: var(--text-mute); }
.search-result-item .cat-badge {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-dim);
  font-weight: 500;
  white-space: nowrap;
}

.hero-stats {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp .6s .3s var(--trans) both;
}
.stat {
  display: flex;
  align-items: center;
  gap: 12px;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  backdrop-filter: blur(10px);
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: left;
}
.stat-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.stat > div:last-child { display: flex; flex-direction: column; line-height: 1.1; }
.stat strong {
  font-size: 1.3rem;
  color: var(--text);
  font-weight: 800;
}
.stat span { font-size: 0.75rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.05em; }

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  line-height: 0;
}
.hero-wave svg { width: 100%; height: 80px; display: block; }

/* =========================================================
   FEATURES
   ========================================================= */
.features-section {
  padding: 60px 20px;
  margin-top: -60px;
  position: relative;
  z-index: 2;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
}
.feature {
  text-align: center;
  padding: 10px;
}
.feature-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 12px;
  transition: transform .3s var(--trans);
}
.feature:hover .feature-icon { transform: scale(1.1) rotate(-5deg); }
.feature h3 { font-size: 1rem; margin-bottom: 4px; }
.feature p { font-size: 0.85rem; color: var(--text-mute); }

/* =========================================================
   SECTIONS
   ========================================================= */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.section-sub {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Categories */
.categories-section { padding: 40px 20px 60px; }
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.category-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  color: var(--text);
  transition: all .3s var(--trans);
  position: relative;
  overflow: hidden;
  animation: fadeInUp .5s var(--trans) both;
  animation-delay: var(--delay, 0ms);
}
.category-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--cat-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--trans);
}
.category-shine {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 50%;
  height: 200%;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--cat-color) 10%, transparent), transparent);
  transform: rotate(25deg);
  transition: left .6s var(--trans);
  pointer-events: none;
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--cat-color);
}
.category-card:hover::before { transform: scaleX(1); }
.category-card:hover .category-shine { left: 150%; }
.category-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--cat-color) 15%, transparent);
  color: var(--cat-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  transition: all .3s var(--trans);
}
.category-card:hover .category-icon {
  background: var(--cat-color);
  color: #fff;
  transform: rotate(-8deg) scale(1.1);
}
.category-card h3 { font-size: 1.25rem; margin-bottom: 8px; }
.category-card p { color: var(--text-dim); font-size: 0.95rem; margin-bottom: 16px; }
.category-count {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--cat-color);
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap .2s;
}
.category-card:hover .category-count { gap: 12px; }

/* Popular */
.popular-section { padding: 40px 20px 60px; }
.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.popular-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  transition: all .25s var(--trans);
  position: relative;
  overflow: hidden;
}
.popular-card:hover {
  transform: translateX(4px);
  border-color: var(--cat-color);
  box-shadow: var(--shadow);
}
.popular-card > i:first-child {
  font-size: 1.3rem;
  color: var(--cat-color);
  background: color-mix(in srgb, var(--cat-color) 12%, transparent);
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all .2s;
}
.popular-card:hover > i:first-child { background: var(--cat-color); color: #fff; transform: scale(1.08); }
.popular-card > div { flex: 1; min-width: 0; }
.popular-card h4 { font-size: 1rem; margin-bottom: 2px; }
.popular-card p { font-size: 0.85rem; color: var(--text-mute); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.popular-arrow { color: var(--text-mute); opacity: 0; transition: all .2s; }
.popular-card:hover .popular-arrow { opacity: 1; color: var(--cat-color); transform: translateX(4px); }

/* CTA */
.cta-section { padding: 40px 20px; }
.cta-card {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(255,255,255,0.15) 0%, transparent 40%);
}
.cta-card > * { position: relative; }
.cta-icons {
  font-size: 2rem;
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 20px;
  opacity: 0.7;
}
.cta-icons i { animation: floatIcon 3s ease-in-out infinite; }
.cta-icons i:nth-child(2) { animation-delay: -1s; }
.cta-icons i:nth-child(3) { animation-delay: -2s; }
@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.cta-card h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: 12px; color: #fff; }
.cta-card p { font-size: 1.05rem; opacity: 0.95; max-width: 560px; margin: 0 auto 24px; }
.cta-btn {
  background: #fff;
  color: var(--primary);
  border: none;
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-xl); }

/* FAQ home */
.faq-section { padding: 40px 20px 80px; max-width: 900px; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .2s;
}
.faq-item:hover { border-color: var(--border-dark); }
.faq-item[open] {
  border-color: var(--cat-color, var(--primary));
  box-shadow: var(--shadow);
}
.faq-item summary {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  user-select: none;
  transition: background .15s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--bg-soft); }
.faq-q { flex: 1; font-size: 0.98rem; }
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--cat-color, var(--primary)) 12%, transparent);
  color: var(--cat-color, var(--primary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
  transition: transform .3s var(--trans);
  flex-shrink: 0;
}
.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: var(--cat-color, var(--primary));
  color: #fff;
}
.faq-a {
  padding: 0 20px 20px;
  color: var(--text-dim);
  line-height: 1.7;
  font-size: 0.95rem;
  animation: fadeInDown .25s var(--trans);
}
.faq-a code {
  background: var(--bg-soft);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  color: var(--text);
}
.faq-a a { font-weight: 600; }

/* =========================================================
   CATEGORY PAGE
   ========================================================= */
.category-hero {
  background:
    radial-gradient(circle at 20% 0%, color-mix(in srgb, var(--cat-color) 12%, transparent), transparent 60%),
    var(--surface);
  padding: 40px 0 50px;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.9rem;
  color: var(--text-mute);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.breadcrumb i.fa-chevron-right { font-size: 0.65rem; }
.breadcrumb a {
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  transition: all .15s;
}
.breadcrumb a:hover { background: var(--bg-soft); color: var(--text); }
.breadcrumb span { color: var(--text); font-weight: 600; padding: 4px 10px; }
.category-hero-content { display: flex; align-items: center; gap: 24px; }
.category-hero-icon {
  width: 80px; height: 80px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--cat-color), color-mix(in srgb, var(--cat-color) 60%, #000));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem;
  flex-shrink: 0;
  box-shadow: 0 10px 30px -8px var(--cat-color);
}
.category-hero-content h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 6px; }
.category-hero-content p { color: var(--text-dim); margin-bottom: 14px; }
.category-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.category-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-soft);
  border-radius: 999px;
}
.category-meta i { color: var(--cat-color); }

.calc-list-section { padding: 40px 20px 80px; }
.calc-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.calc-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  transition: all .25s var(--trans);
  animation: fadeInUp .4s var(--trans) both;
  animation-delay: var(--delay, 0ms);
}
.calc-item:hover {
  border-color: var(--cat-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.calc-item > i:first-child {
  font-size: 1.25rem;
  color: var(--cat-color);
  width: 48px; height: 48px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--cat-color) 12%, transparent);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all .25s;
}
.calc-item:hover > i:first-child {
  background: var(--cat-color);
  color: #fff;
  transform: rotate(-5deg) scale(1.05);
}
.calc-item-body { flex: 1; min-width: 0; }
.calc-item h3 { font-size: 1rem; margin-bottom: 2px; }
.calc-item p { font-size: 0.85rem; color: var(--text-mute); }
.calc-item .arrow {
  color: var(--text-mute);
  transition: all .2s;
  flex-shrink: 0;
}
.calc-item:hover .arrow { color: var(--cat-color); transform: translateX(4px); }

/* =========================================================
   CALCULATOR PAGE
   ========================================================= */
.calc-page-header {
  background:
    radial-gradient(circle at 20% 0%, color-mix(in srgb, var(--cat-color) 12%, transparent), transparent 60%),
    var(--surface);
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--border);
}
.calc-header-content { display: flex; align-items: center; gap: 20px; }
.calc-header-icon {
  width: 72px; height: 72px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--cat-color), color-mix(in srgb, var(--cat-color) 60%, #000));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
  box-shadow: 0 10px 25px -8px var(--cat-color);
}
.calc-header-content h1 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 4px; }
.calc-header-content p { color: var(--text-dim); }

.calc-page-body {
  padding: 40px 20px 80px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 30px;
}
.calc-main { min-width: 0; }
.calc-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

/* =========================================================
   CALC FORM
   ========================================================= */
.calc-form {}
.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-dim);
}
.form-row label input[type="checkbox"] { margin-right: 8px; accent-color: var(--cat-color); }
.form-row input[type="text"],
.form-row input[type="number"],
.form-row input[type="date"],
.form-row input[type="datetime-local"],
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: all .15s;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--cat-color);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--cat-color) 18%, transparent);
}
.form-row input[type="range"] {
  padding: 0;
  accent-color: var(--cat-color);
}
.form-row textarea { resize: vertical; min-height: 80px; }

.btn-calc {
  background: var(--cat-color);
  color: #fff;
  border: none;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s var(--trans);
  font-family: inherit;
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 14px -4px var(--cat-color);
}
.btn-calc:hover { filter: brightness(0.95); transform: translateY(-2px); box-shadow: 0 8px 20px -6px var(--cat-color); }
.btn-calc:active { transform: translateY(0); }
.btn-calc.secondary {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border-dark);
  box-shadow: none;
}
.btn-calc.secondary:hover { background: var(--border); }

.result-box {
  margin-top: 24px;
  padding: 24px;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--cat-color) 8%, var(--surface)),
    color-mix(in srgb, var(--cat-color) 3%, var(--surface)));
  border: 1px solid color-mix(in srgb, var(--cat-color) 25%, transparent);
  border-radius: var(--radius);
  font-size: 1rem;
  display: none;
}
.result-box.show { display: block; animation: slideInUp .35s var(--trans); }
.result-box h4 {
  color: var(--cat-color);
  margin-bottom: 10px;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.result-box .big-result {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 800;
  color: var(--cat-color);
  margin: 8px 0;
  word-wrap: break-word;
  letter-spacing: -0.02em;
}
.result-box .result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.result-box .result-item {
  background: var(--surface);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all .2s;
}
.result-box .result-item:hover { border-color: var(--cat-color); transform: translateY(-2px); }
.result-box .result-item .label {
  font-size: 0.78rem;
  color: var(--text-mute);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.result-box .result-item .value { font-weight: 700; font-size: 1.15rem; color: var(--text); }
.result-box table {
  width: 100%;
  margin-top: 12px;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.result-box th, .result-box td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
.result-box th { background: color-mix(in srgb, var(--cat-color) 12%, var(--surface)); font-weight: 600; }
.result-box.info {
  background: var(--bg-soft);
  border-color: var(--border);
  color: var(--text-dim);
  text-align: center;
}
.result-box.error { background: color-mix(in srgb, #ef4444 10%, var(--surface)); border-color: #fca5a5; color: #991b1b; }
[data-theme="dark"] .result-box.error { color: #fca5a5; }

@keyframes slideInUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* Chart container */
.chart-container {
  margin-top: 20px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  height: 300px;
}
.chart-container canvas { max-width: 100%; }
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.chart-legend > div { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend .dot { width: 12px; height: 12px; border-radius: 50%; }

/* FAQ on calc page */
.calc-faq-section {
  margin-top: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.faq-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.faq-header i {
  font-size: 1.5rem;
  color: var(--cat-color);
  background: color-mix(in srgb, var(--cat-color) 12%, transparent);
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.faq-header h2 { font-size: 1.3rem; margin: 0; }

.calc-info {
  margin-top: 24px;
  padding: 16px 20px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--cat-color);
}
.calc-info h3 { font-size: 1rem; margin-bottom: 8px; }
.calc-info p, .calc-info ul { font-size: 0.9rem; color: var(--text-dim); }
.calc-info ul { padding-left: 20px; margin-top: 6px; }
.calc-info code {
  background: var(--surface);
  padding: 4px 10px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  display: inline-block;
  margin: 6px 0;
  border: 1px solid var(--border);
  color: var(--text);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--border);
  flex-wrap: wrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  background: none;
  border: none;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-mute);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: inherit;
  transition: all .2s;
  white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--cat-color); border-bottom-color: var(--cat-color); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeInUp .25s var(--trans); }

/* Fractions */
.fractions-row {
  display: flex; align-items: center; gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.fraction {
  display: flex; flex-direction: column; align-items: center;
  gap: 4px;
  width: 80px;
}
.fraction input {
  width: 80px;
  padding: 8px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 1.1rem;
  background: var(--surface);
  color: var(--text);
}
.fraction-bar { width: 80px; height: 2px; background: var(--text); }
.fractions-row > select {
  padding: 10px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--surface);
  color: var(--text);
}

/* Basic calculator */
.basic-calc {
  max-width: 340px;
  margin: 0 auto;
  background: #1e293b;
  padding: 16px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}
.bc-display {
  width: 100%;
  padding: 18px 16px;
  background: #0f172a;
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  text-align: right;
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 12px;
  font-family: 'Courier New', monospace;
}
.bc-keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.bc-key {
  padding: 18px 0;
  border: none;
  border-radius: var(--radius-sm);
  background: #334155;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .1s var(--trans);
  font-family: inherit;
}
.bc-key:hover { background: #475569; }
.bc-key:active { transform: scale(0.95); }
.bc-key.op { background: #475569; color: #fbbf24; }
.bc-key.eq { background: var(--primary); color: #fff; }
.bc-key.eq:hover { background: var(--primary-dark); }
.bc-key.span2 { grid-column: span 2; }

.sc-help {
  background: var(--bg-soft);
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  line-height: 1.8;
}

/* Chrono */
.chrono-display {
  font-family: 'Courier New', monospace;
  font-size: clamp(1.8rem, 7vw, 3rem);
  font-weight: 700;
  text-align: center;
  padding: 30px;
  background: #0f172a;
  color: #fff;
  border-radius: var(--radius);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.chrono-buttons { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-bottom: 16px; }
.chrono-laps { list-style: none; max-height: 200px; overflow-y: auto; background: var(--bg-soft); border-radius: var(--radius-sm); }
.chrono-laps li { padding: 8px 16px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; color: var(--text); }
.chrono-laps li:last-child { border-bottom: none; }

.countdown-box.show { display: block; text-align: center; font-size: 1.5rem; font-weight: 700; }

/* Sidebar */
.calc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: fit-content;
  position: sticky;
  top: calc(var(--header-h) + 20px);
}
.sidebar-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.sidebar-block h3 {
  font-size: 1rem;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sidebar-list { list-style: none; }
.sidebar-list li { margin-bottom: 4px; }
.sidebar-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 0.9rem;
  transition: all .15s;
}
.sidebar-list a:hover {
  background: color-mix(in srgb, var(--cat-color) 10%, transparent);
  color: var(--text);
  transform: translateX(4px);
}
.sidebar-list a > i:first-child { width: 18px; text-align: center; color: var(--cat-color); }
.sidebar-list a > span { flex: 1; }
.sidebar-arrow { font-size: 0.7rem; opacity: 0; transition: opacity .15s; }
.sidebar-list a:hover .sidebar-arrow { opacity: 1; }

.sidebar-promo {
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, var(--surface)), var(--surface));
  border: 1px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
}
.sidebar-promo > i {
  font-size: 1.5rem;
  color: #f59e0b;
  margin-bottom: 10px;
}
.sidebar-promo h4 { font-size: 1rem; margin-bottom: 6px; }
.sidebar-promo p { font-size: 0.85rem; color: var(--text-dim); }
.sidebar-promo kbd {
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.75rem;
  border: 1px solid var(--border);
  font-family: monospace;
}

/* =========================================================
   ABOUT / ERROR
   ========================================================= */
.error-section {
  padding: 80px 20px;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.error-icon {
  width: 100px; height: 100px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
  margin: 0 auto 24px;
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.about-section { padding: 60px 20px; max-width: 1100px; }
.about-hero { text-align: center; margin-bottom: 50px; }
.about-icon {
  width: 90px; height: 90px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 24px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-xl);
}
.about-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 14px; }
.about-lead { font-size: 1.15rem; color: var(--text-dim); }
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 50px;
}
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  text-align: center;
  transition: all .3s;
}
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.about-card-icon {
  width: 60px; height: 60px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 16px;
}
.about-card h3 { margin-bottom: 10px; }
.about-card p { color: var(--text-dim); font-size: 0.95rem; }

.about-tech { text-align: center; padding: 40px 0; }
.about-tech h2 { margin-bottom: 24px; font-size: 1.5rem; }
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}
.tech-item {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all .2s;
}
.tech-item:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.about-cta { text-align: center; padding: 30px 0; color: var(--text-dim); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  margin-top: 20px;
  transition: all .2s;
  box-shadow: 0 6px 20px -6px var(--primary);
}
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 10px 25px -6px var(--primary); }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 60px 0 20px;
  margin-top: 60px;
}
[data-theme="dark"] .site-footer {
  background: #050915;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 30px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.footer-logo em { color: var(--primary); font-style: normal; }
.footer-col h4 {
  color: #fff;
  margin-bottom: 14px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-col p { font-size: 0.9rem; color: #94a3b8; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul a { color: #94a3b8; font-size: 0.9rem; transition: color .15s; }
.footer-col ul a:hover { color: #fff; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: rgba(255,255,255,0.1);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
}
.footer-social a:hover {
  background: var(--primary);
  transform: translateY(-2px);
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom .dim { opacity: 0.6; }
.footer-built i { margin: 0 3px; }

/* Scroll-to-top */
.scroll-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .25s;
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top:hover { transform: translateY(-3px) scale(1.05); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
  .calc-page-body { grid-template-columns: 1fr; }
  .calc-sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
  .sidebar-block { flex: 1; min-width: 260px; }
  .sidebar-promo { flex: 1; min-width: 260px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 700px) {
  :root { --header-h: 60px; }
  .header-inner { gap: 10px; }
  .logo { font-size: 1.05rem; }
  .logo-icon { width: 32px; height: 32px; font-size: 0.9rem; }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background: var(--surface);
    padding: 20px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform .3s var(--trans);
    align-items: stretch;
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
    z-index: 99;
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav .nav-link { justify-content: flex-start; padding: 14px 16px; font-size: 1rem; }
  .nav-dropdown { order: 2; }
  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    padding: 0 0 0 16px;
    min-width: 0;
    display: none;
    background: transparent;
  }
  .nav-dropdown.open .nav-dropdown-menu { display: block; }
  .dropdown-item { padding: 10px 12px; }

  .burger { display: flex; }

  .hero { padding: 40px 0 100px; }
  .hero-badge { font-size: 0.78rem; padding: 6px 12px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat { padding: 10px 12px; gap: 10px; }
  .stat-icon { width: 36px; height: 36px; font-size: 0.9rem; }
  .stat strong { font-size: 1.1rem; }
  .stat span { font-size: 0.7rem; }

  .search-bar {
    flex-direction: column;
    border-radius: var(--radius);
    padding: 12px;
    gap: 10px;
  }
  .search-bar > i.fa-magnifying-glass { display: none; }
  .search-bar input { width: 100%; text-align: center; padding: 10px 0; }
  .search-bar button { width: 100%; }

  .features-section { margin-top: -70px; padding: 30px 12px; }
  .features-grid { padding: 20px; grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .feature { padding: 6px 4px; }
  .feature-icon { width: 48px; height: 48px; font-size: 1.2rem; margin-bottom: 8px; }
  .feature h3 { font-size: 0.92rem; }
  .feature p { font-size: 0.78rem; }

  .categories-section, .popular-section, .faq-section, .cta-section { padding: 30px 12px; }
  .section-header { margin-bottom: 24px; }

  .category-card { padding: 20px; }
  .category-icon { width: 48px; height: 48px; font-size: 1.25rem; }
  .category-card h3 { font-size: 1.1rem; }

  .popular-card { padding: 14px; }

  .cta-card { padding: 40px 20px; border-radius: var(--radius-lg); }
  .cta-icons { font-size: 1.5rem; gap: 20px; }

  .category-hero, .calc-page-header { padding: 24px 0 30px; }
  .category-hero-content, .calc-header-content { flex-direction: column; text-align: center; gap: 14px; }
  .category-hero-icon { width: 64px; height: 64px; font-size: 1.8rem; }
  .calc-header-icon { width: 56px; height: 56px; font-size: 1.5rem; }
  .category-meta { justify-content: center; }

  .calc-list-section, .calc-page-body { padding: 24px 12px 50px; }
  .calc-wrapper { padding: 20px; border-radius: var(--radius); }
  .calc-faq-section { padding: 20px; border-radius: var(--radius); }
  .faq-item summary { padding: 14px 16px; }
  .faq-q { font-size: 0.9rem; }
  .faq-a { padding: 0 16px 16px; font-size: 0.9rem; }

  .chart-container { height: 250px; padding: 14px; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .scroll-top { width: 42px; height: 42px; bottom: 14px; right: 14px; }

  .result-box { padding: 18px; }
  .result-box .result-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .result-box .result-item { padding: 10px; }
  .result-box .result-item .value { font-size: 1rem; }

  .about-section { padding: 30px 12px; }
  .about-hero { margin-bottom: 30px; }
  .about-icon { width: 70px; height: 70px; font-size: 2rem; }
}

@media (max-width: 400px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .result-box .result-grid { grid-template-columns: 1fr; }
  .bc-key { padding: 14px 0; font-size: 1.1rem; }
}

/* Réduction d'animations pour accessibilité */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero-blob { animation: none; }
}

/* Mobile nav overlay when open */
body.nav-open { overflow: hidden; }

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Selection */
::selection { background: var(--primary); color: #fff; }