/* ===== FORMATBASE STYLES ===== */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --primary: #0f6fff;
  --primary-dark: #0052d4;
  --primary-light: #e8f1ff;
  --accent: #00c6ff;
  --dark: #0a0f1e;
  --dark-2: #111827;
  --dark-3: #1e2a3a;
  --gray: #6b7a99;
  --gray-light: #b0bdd0;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --white: #ffffff;
  --success: #10b981;
  --code-bg: #1a2234;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(15,111,255,0.10);
  --shadow-lg: 0 8px 40px rgba(15,111,255,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Poppins', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
  --bg: #0a0f1e;
  --white: #111827;
  --dark: #f1f5f9;
  --dark-2: #e2e8f0;
  --dark-3: #1e2a3a;
  --border: #1e2d45;
  --gray: #8896b0;
  --gray-light: #64748b;
  --primary-light: #0a1a35;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--dark);
  line-height: 1.65;
  font-size: 16px;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== NAVBAR ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: -0.5px;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-links a {
  color: var(--gray);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.btn-theme {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
  color: var(--gray);
}

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

.btn { 
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 3px 12px rgba(15,111,255,0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(15,111,255,0.4);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
}

.btn-ghost {
  background: var(--primary-light);
  color: var(--primary);
}

.btn-ghost:hover { background: var(--primary); color: white; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: all var(--transition);
  display: block;
}

.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, #0a0f1e 0%, #0d1b3e 50%, #0a1a35 100%);
  color: white;
  padding: 96px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(15,111,255,0.15) 0%, transparent 70%);
  top: -100px;
  right: -100px;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,198,255,0.08) 0%, transparent 70%);
  bottom: -50px;
  left: 10%;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(15,111,255,0.2);
  border: 1px solid rgba(15,111,255,0.3);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.hero-stat { text-align: left; }
.hero-stat .num { font-size: 1.8rem; font-weight: 800; color: white; letter-spacing: -1px; }
.hero-stat .label { font-size: 0.8rem; color: rgba(255,255,255,0.5); }

.hero-visual {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #a8b8d8;
  backdrop-filter: blur(10px);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.code-dot { width: 10px; height: 10px; border-radius: 50%; }
.code-dot.red { background: #ff5f57; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #28ca40; }
.code-filename { margin-left: auto; font-size: 0.75rem; color: rgba(255,255,255,0.3); }

.code-line { padding: 2px 0; }
.code-comment { color: #4a6a8a; }
.code-keyword { color: #569cd6; }
.code-class { color: #4ec9b0; }
.code-method { color: #dcdcaa; }
.code-string { color: #ce9178; }
.code-type { color: #9cdcfe; }
.code-indent { padding-left: 20px; }
.code-indent2 { padding-left: 40px; }

/* ===== SECTION LAYOUT ===== */
.section { padding: 80px 24px; }
.section-sm { padding: 56px 24px; }

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

.section-head { text-align: center; margin-bottom: 52px; }
.section-label {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--dark);
  margin-bottom: 12px;
}
.section-head p { color: var(--gray); font-size: 1rem; max-width: 520px; margin: 0 auto; }

/* ===== CARDS ===== */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(15,111,255,0.2);
}

.card-badge {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.3px;
}

.card-badge.beginner { background: #ecfdf5; color: #059669; }
.card-badge.intermediate { background: #fffbeb; color: #d97706; }
.card-badge.advanced { background: #fef2f2; color: #dc2626; }

.card-img {
  height: 160px;
  background: linear-gradient(135deg, #0a1535 0%, #1a2d55 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.3));
}

.card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.card-body h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.card-body p { color: var(--gray); font-size: 0.875rem; flex: 1; margin-bottom: 16px; }

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--gray-light);
  margin-bottom: 14px;
}
.card-meta span { display: flex; align-items: center; gap: 4px; }

.card-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ===== TUTORIAL GRID ===== */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

/* ===== CATEGORIES ===== */
.categories { background: var(--primary-light); }
[data-theme="dark"] .categories { background: rgba(15,111,255,0.05); }

.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.cat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
}

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

.cat-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto 14px;
}

.cat-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; color: var(--dark); }
.cat-card p { font-size: 0.82rem; color: var(--gray); }
.cat-count { font-size: 0.78rem; color: var(--primary); font-weight: 600; margin-top: 10px; }

/* ===== WHY SECTION ===== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.why-item {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.why-item:hover { box-shadow: var(--shadow-md); border-color: rgba(15,111,255,0.2); }

.why-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.why-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.why-item p { font-size: 0.875rem; color: var(--gray); }

/* ===== NEWSLETTER ===== */
.newsletter {
  background: linear-gradient(135deg, var(--dark-2) 0%, #0d1b3e 100%);
  color: white;
  text-align: center;
  padding: 80px 24px;
}

[data-theme="dark"] .newsletter { background: linear-gradient(135deg, #0a0f1e 0%, #0d1b3e 100%); }

.newsletter h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: 12px; }
.newsletter p { color: rgba(255,255,255,0.65); margin-bottom: 32px; font-size: 1rem; }

.subscribe-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.subscribe-form input {
  flex: 1;
  min-width: 240px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.08);
  color: white;
  font-family: var(--font);
  font-size: 0.9rem;
  outline: none;
  transition: border var(--transition);
}

.subscribe-form input:focus { border-color: var(--primary); }
.subscribe-form input::placeholder { color: rgba(255,255,255,0.4); }

/* ===== AD SLOTS ===== */
.ad-slot {
  background: var(--primary-light);
  border: 1px dashed rgba(15,111,255,0.25);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-light);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.ad-slot.ad-header { height: 90px; width: 100%; margin-bottom: 24px; }
.ad-slot.ad-sidebar { height: 250px; width: 100%; }
.ad-slot.ad-in-content { height: 120px; width: 100%; margin: 28px 0; }
.ad-slot.ad-footer { height: 90px; width: 100%; margin-top: 24px; }

[data-theme="dark"] .ad-slot { background: rgba(15,111,255,0.05); }

/* ===== FOOTER ===== */
footer {
  background: var(--dark-2);
  color: rgba(255,255,255,0.7);
  padding: 60px 24px 0;
}

[data-theme="dark"] footer { background: #070c18; }

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-brand .nav-logo { margin-bottom: 14px; color: white; }
.footer-brand p { font-size: 0.875rem; color: rgba(255,255,255,0.5); line-height: 1.7; }

.footer-col h4 {
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  margin-bottom: 10px;
  transition: color var(--transition);
}

.footer-col a:hover { color: var(--primary); }

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== TUTORIAL PAGE LAYOUT ===== */
.tuts-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.sidebar,
.left-sidebar,
.toc-sidebar {
  position: sticky;
  top: 84px;
  height: fit-content;
}

.sidebar-section {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-section h3 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray);
  margin-bottom: 14px;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gray);
  font-size: 0.875rem;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  margin-bottom: 2px;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* ===== SEARCH BAR ===== */
.search-wrap {
  position: relative;
  margin-bottom: 24px;
}

.search-wrap input {
  width: 100%;
  padding: 11px 16px 11px 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--dark);
  outline: none;
  transition: border var(--transition);
}

.search-wrap input:focus { border-color: var(--primary); }
.search-wrap input::placeholder { color: var(--gray-light); }

.search-wrap .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-light);
  font-size: 1rem;
}

/* ===== TUTORIAL CONTENT PAGE ===== */
.tutorial-layout {
  display: grid;
  grid-template-columns: 240px 1fr 200px;
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.tutorial-article {
  min-width: 0;
}

.article-content,
.topic-grid {
  min-width: 0;
}

.tutorial-article h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.article-meta span { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--gray); }

.article-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 36px 0 14px;
  padding-top: 8px;
  color: var(--dark);
}

.article-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--dark);
}

.article-content p {
  color: var(--gray);
  margin-bottom: 16px;
  font-size: 0.95rem;
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { color: var(--gray); margin-bottom: 6px; font-size: 0.95rem; }

.code-block {
  background: var(--code-bg);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #a8b8d8;
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid rgba(255,255,255,0.05);
  line-height: 1.7;
}

.code-block .kw { color: #569cd6; }
.code-block .cls { color: #4ec9b0; }
.code-block .str { color: #ce9178; }
.code-block .cm { color: #608060; }
.code-block .meth { color: #dcdcaa; }
.code-block .num { color: #b5cea8; }

.info-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
}

.info-box p { color: var(--primary-dark); margin: 0; font-size: 0.875rem; }

/* ===== ABOUT PAGE ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition);
}

.team-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }

.team-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 14px;
}

.team-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; color: var(--dark); }
.team-card .role { font-size: 0.82rem; color: var(--primary); font-weight: 500; margin-bottom: 10px; }
.team-card p { font-size: 0.82rem; color: var(--gray); }

/* ===== CONTACT PAGE ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form { 
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}

.contact-form h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 24px; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: var(--dark); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--dark);
  background: var(--bg);
  outline: none;
  transition: border var(--transition);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--primary); }

.contact-info { padding: 20px 0; }
.contact-info h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.contact-info p { color: var(--gray); margin-bottom: 28px; }

.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 20px;
}
.contact-item .ci-icon {
  width: 42px;
  height: 42px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item .ci-text h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 3px; }
.contact-item .ci-text p { font-size: 0.85rem; color: var(--gray); margin: 0; }

/* ===== PAGE HERO ===== */
.page-hero {
  background: linear-gradient(135deg, #0a0f1e 0%, #0d1b3e 100%);
  color: white;
  padding: 64px 24px;
  text-align: center;
}
.page-hero h1 { font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800; margin-bottom: 10px; }
.page-hero p { color: rgba(255,255,255,0.6); font-size: 1rem; }

/* ===== POLICY PAGES ===== */
.policy-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}
.policy-content h2 { font-size: 1.25rem; font-weight: 700; margin: 32px 0 12px; }
.policy-content p, .policy-content li { font-size: 0.95rem; color: var(--gray); line-height: 1.8; margin-bottom: 12px; }
.policy-content ul { padding-left: 20px; list-style: disc; }
.policy-meta { font-size: 0.8rem; color: var(--gray-light); margin-bottom: 32px; }

/* ===== FILTER TABS ===== */
.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.filter-tab {
  padding: 7px 18px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--gray);
  transition: all var(--transition);
  font-family: var(--font);
}
.filter-tab:hover, .filter-tab.active { background: var(--primary); color: white; border-color: var(--primary); }

/* ===== SCROLL TO TOP ===== */
#scrollTop {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(15,111,255,0.35);
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

#scrollTop.visible { opacity: 1; pointer-events: all; }
#scrollTop:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(15,111,255,0.45); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  font-size: 0.82rem;
  color: var(--gray);
  margin-bottom: 16px;
}
.breadcrumb a, .breadcrumb span {
  white-space: nowrap;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { color: var(--gray-light); }

/* ===== PROGRESS BAR ===== */
#readProgress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 1100;
  transition: width 0.1s;
  width: 0%;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .tutorial-layout { grid-template-columns: 220px 1fr; }
  .tutorial-layout .toc-sidebar { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { 
    display: none;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    gap: 2px;
    z-index: 999;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 14px; border-radius: var(--radius-sm); }
  .hamburger { display: flex; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-stats { gap: 16px; }
  .tuts-layout { grid-template-columns: 1fr; }
  .sidebar { position: relative; top: 0; }
  .tutorial-layout { grid-template-columns: 1fr; }
  .tutorial-layout .left-sidebar,
  .tutorial-layout .toc-sidebar { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .subscribe-form { flex-direction: column; }
  .subscribe-form input { min-width: 100%; }
}

@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
  .hero { padding: 60px 16px 48px; }
  .section { padding: 56px 16px; }
}