style.css

/* ====== RAG GUIDE - Override Styles ====== */
/* Base styles from common/base.css */

/* ====== DESIGN TOKENS (guide-specific + aliases) ====== */
:root {
  /* Accent & Gradients */
  --accent: var(--purple);
  --accent-dim: var(--purple-dim);
  --gradient-1: linear-gradient(135deg, #a78bfa 0%, #6366f1 50%, #3b82f6 100%);

  /* RAG-specific aliases (maps base.css vars → RAG naming) */
  --bg-primary: var(--bg);
  --bg-secondary: #111118;
  --bg-elevated: #1e1e2a;
  --text-primary: var(--text);
  --accent-purple: #a78bfa;
  --accent-blue: #6366f1;
  --accent-cyan: var(--cyan);
  --accent-green: var(--green);
  --accent-orange: var(--orange);
  --accent-red: var(--red);
  --accent-pink: var(--pink);
  --gradient-main: linear-gradient(135deg, #a78bfa 0%, #6366f1 50%, #3b82f6 100%);
  --gradient-warm: linear-gradient(135deg, #f472b6 0%, #a78bfa 100%);
  --gradient-cool: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --border-color: var(--border);
  --border-subtle: var(--border-light);
  --radius-md: var(--radius);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(99,102,241,0.15);

  /* Graph RAG colors */
  --graph-edge: #4a4a6a;
  --node-1: #6366f1;
  --node-2: #a78bfa;
  --node-3: #22d3ee;
  --node-4: #34d399;
  --node-5: #f472b6;
}

/* ====== RESET & BASE ====== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent-purple); text-decoration: none; }
a:hover { color: var(--accent-cyan); }

strong { color: var(--text-primary); font-weight: 600; }
em { color: var(--accent-cyan); font-style: normal; }
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--accent-cyan);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ====== NAV ====== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.95);
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.nav-logo .accent {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(167, 139, 250, 0.1);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a {
    padding: 10px 16px;
    font-size: 1rem;
  }
}

/* ====== HERO ====== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 70%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-purple);
  background: rgba(167, 139, 250, 0.1);
  border: 1px solid rgba(167, 139, 250, 0.2);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
}

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-main);
  color: white;
  font-weight: 600;
  border-radius: 100px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
  color: white;
}

/* ====== SECTIONS ====== */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-purple);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 48px;
  line-height: 1.8;
}

.subsection-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 48px 0 24px;
  letter-spacing: -0.5px;
}

/* ====== PROBLEM CARDS ====== */
.problem-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.3s ease;
}

.problem-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-red);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.problem-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-red);
  margin-bottom: 16px;
}

.problem-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.problem-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Solution banner */
.solution-banner {
  display: flex;
  align-items: center;
  gap: 24px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(167, 139, 250, 0.1) 100%);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.solution-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
}

.solution-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.solution-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ====== ANALOGY BOX ====== */
.analogy-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.analogy-left, .analogy-right {
  text-align: center;
  flex: 1;
  min-width: 200px;
}

.analogy-emoji {
  font-size: 3rem;
  margin-bottom: 12px;
}

.analogy-left h4, .analogy-right h4 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.analogy-left p, .analogy-right p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.muted { color: var(--text-muted); font-size: 0.85rem; }

.analogy-vs {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-purple);
  flex-shrink: 0;
}

.analogy-right {
  background: rgba(99, 102, 241, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid rgba(99, 102, 241, 0.15);
}

/* ====== PIPELINE ====== */
.pipeline-section {
  margin-bottom: 48px;
}

.pipeline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 40px 0;
  overflow-x: auto;
  flex-wrap: wrap;
}

.pipeline-step {
  text-align: center;
  flex-shrink: 0;
}

.step-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 1.5rem;
  font-weight: 800;
  border: 2px solid;
}

.step-icon svg {
  width: 32px;
  height: 32px;
}

.query-icon { background: rgba(167, 139, 250, 0.15); border-color: var(--accent-purple); color: var(--accent-purple); }
.retrieve-icon { background: rgba(34, 211, 238, 0.15); border-color: var(--accent-cyan); color: var(--accent-cyan); }
.augment-icon { background: rgba(52, 211, 153, 0.15); border-color: var(--accent-green); color: var(--accent-green); }
.generate-icon { background: rgba(251, 146, 60, 0.15); border-color: var(--accent-orange); color: var(--accent-orange); }

.step-label {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.step-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pipeline-arrow {
  width: 48px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.pipeline-arrow svg {
  width: 100%;
  height: auto;
}

/* ====== CONCEPT GRID ====== */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.concept-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
}

.concept-card:hover {
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-glow);
}

.concept-number {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(167, 139, 250, 0.2);
  margin-bottom: 8px;
  line-height: 1;
}

.concept-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.concept-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* Embedding visual */
.concept-visual {
  position: relative;
  height: 160px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.vector-point {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 10px;
  height: 10px;
  background: var(--accent-purple);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.vector-point span {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-secondary);
  white-space: nowrap;
  font-weight: 500;
}

.vector-point:nth-child(2) { background: var(--accent-cyan); }
.vector-point:nth-child(3) { background: var(--accent-orange); }
.vector-point:nth-child(4) { background: var(--accent-red); }
.vector-point:nth-child(5) { background: var(--accent-green); }

/* DB visual */
.db-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.db-icon-large {
  width: 64px;
  height: 64px;
  color: var(--accent-cyan);
}

.db-examples {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

/* Search visual */
.search-visual {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 16px;
}

.search-query {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-purple);
  margin-bottom: 12px;
  padding: 6px 12px;
  background: rgba(167, 139, 250, 0.1);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.search-results {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.search-result {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  padding: 6px 10px;
  border-radius: 6px;
  background: rgba(255,255,255,0.03);
}

.search-result span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.match-high { border-left: 3px solid var(--accent-green); }
.match-high span { color: var(--accent-green); }
.match-mid { border-left: 3px solid var(--accent-orange); }
.match-mid span { color: var(--accent-orange); }
.match-low { border-left: 3px solid var(--text-muted); }
.match-low span { color: var(--text-muted); }

/* Paper ref */
.paper-ref {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-purple);
  border-radius: var(--radius-md);
  padding: 24px;
}

.paper-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-purple);
  background: rgba(167, 139, 250, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.paper-ref p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ====== EVOLUTION TIMELINE ====== */
.evolution-timeline {
  position: relative;
  padding-left: 40px;
}

.evolution-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-red), var(--accent-orange), var(--accent-green));
}

.evo-item {
  position: relative;
  margin-bottom: 40px;
}

.evo-item:last-child { margin-bottom: 0; }

.evo-marker {
  position: absolute;
  left: -33px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid;
}

.evo-naive .evo-marker { border-color: var(--accent-red); background: var(--bg-primary); }
.evo-advanced .evo-marker { border-color: var(--accent-orange); background: var(--bg-primary); }
.evo-modular .evo-marker { border-color: var(--accent-green); background: var(--bg-primary); }

.evo-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.evo-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.evo-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.evo-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.evo-content code {
  display: block;
  padding: 8px 12px;
  font-size: 0.8rem;
  margin-top: 4px;
}

/* ====== NAIVE RAG ====== */
.naive-pipeline {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 20px 0 40px;
}

.naive-step {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 32px;
  max-width: 400px;
  width: 100%;
  transition: all 0.3s ease;
}

.naive-step:hover {
  border-color: var(--accent-purple);
  transform: scale(1.02);
}

.naive-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-purple);
  margin: 0 auto 12px;
}

.naive-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.naive-step p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.naive-arrow-down {
  width: 24px;
  height: 48px;
  color: var(--text-muted);
}

.naive-arrow-down svg {
  width: 100%;
  height: 100%;
}

/* Limit cards */
.limit-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.limit-card {
  background: rgba(248, 113, 113, 0.05);
  border: 1px solid rgba(248, 113, 113, 0.15);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.3s ease;
}

.limit-card:hover {
  border-color: rgba(248, 113, 113, 0.3);
  background: rgba(248, 113, 113, 0.08);
}

.limit-number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: rgba(248, 113, 113, 0.3);
  margin-bottom: 8px;
}

.limit-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.limit-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ====== ADVANCED RAG TABS ====== */
.adv-tabs {
  margin-top: 32px;
}

.tab-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab-btn:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.tab-btn.active {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.tab-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-elevated);
  font-size: 0.75rem;
  font-weight: 700;
}

.tab-btn.active .tab-number {
  background: var(--accent-blue);
  color: white;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

/* Technique grid */
.technique-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.technique-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all 0.3s ease;
}

.technique-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-sm);
}

.technique-featured {
  grid-column: 1 / -1;
}

.technique-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.paper-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--accent-cyan);
  background: rgba(34, 211, 238, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.technique-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.technique-note {
  font-size: 0.8rem !important;
  color: var(--text-muted) !important;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

/* Technique example */
.technique-example {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  flex-wrap: wrap;
}

.example-before {
  color: var(--text-muted);
  padding: 4px 10px;
  background: rgba(248, 113, 113, 0.1);
  border-radius: 4px;
}

.example-arrow {
  color: var(--accent-purple);
  font-weight: 700;
}

.example-after {
  color: var(--accent-green);
  padding: 4px 10px;
  background: rgba(52, 211, 153, 0.1);
  border-radius: 4px;
}

/* Technique flow */
.technique-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.flow-step {
  padding: 6px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
}

.flow-step.highlight {
  background: rgba(167, 139, 250, 0.15);
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

.flow-arrow {
  color: var(--text-muted);
  font-weight: 700;
}

/* Chunk comparison */
.chunk-comparison {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.chunk-type {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 12px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.chunk-type strong {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  min-width: 100px;
}

.chunk-desc {
  color: var(--text-secondary);
}

/* Hybrid visual */
.hybrid-visual {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  padding: 20px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-md);
  flex-wrap: wrap;
  justify-content: center;
}

.hybrid-side {
  text-align: center;
  flex: 1;
  min-width: 120px;
}

.hybrid-label {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.hybrid-bar {
  height: 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}

.dense-bar { background: var(--accent-purple); width: 80%; margin: 0 auto 6px; }
.sparse-bar { background: var(--accent-orange); width: 70%; margin: 0 auto 6px; }
.hybrid-bar-result { background: var(--gradient-main); width: 95%; margin: 0 auto 6px; }

.hybrid-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.hybrid-plus, .hybrid-equals {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Rerank visual */
.rerank-visual {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.rerank-before, .rerank-after {
  flex: 1;
  min-width: 180px;
}

.rerank-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.rerank-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  margin-bottom: 4px;
  background: rgba(0,0,0,0.2);
  border-radius: 6px;
  font-size: 0.8rem;
}

.rerank-item .score {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.highlight-bad { border-left: 3px solid var(--accent-orange); }
.highlight-good {
  border-left: 3px solid var(--accent-green);
  background: rgba(52, 211, 153, 0.1) !important;
}
.highlight-good .score { color: var(--accent-green) !important; }

.rerank-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--accent-purple);
  flex-shrink: 0;
  width: 60px;
}

.rerank-arrow svg {
  width: 48px;
}

.rerank-arrow span {
  font-size: 0.7rem;
  font-weight: 600;
}

/* ====== MODULAR RAG ====== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}

.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.module-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.module-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.module-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.module-router:hover { border-color: var(--accent-purple); }
.module-judge:hover { border-color: var(--accent-orange); }
.module-adaptive:hover { border-color: var(--accent-cyan); }
.module-multi:hover { border-color: var(--accent-green); }
.module-iterative:hover { border-color: var(--accent-blue); }
.module-memory:hover { border-color: var(--accent-pink); }

/* Pattern cards */
.pattern-cards {
  display: grid;
  gap: 24px;
}

.pattern-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
}

.pattern-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.pattern-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.pattern-header h4 {
  font-size: 1.3rem;
  font-weight: 800;
}

.pattern-card > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.pattern-insight {
  margin-top: 20px;
  padding: 16px;
  background: rgba(99, 102, 241, 0.06);
  border: 1px solid rgba(99, 102, 241, 0.12);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pattern-insight strong {
  color: var(--accent-purple);
}

/* Self-RAG flow */
.pattern-flow {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  flex-wrap: wrap;
  padding: 16px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-md);
}

.pf-step {
  padding: 8px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
}

.pf-decision {
  background: rgba(167, 139, 250, 0.12);
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.pf-arrow {
  color: var(--text-muted);
  font-weight: 700;
  line-height: 2.4;
}

.pf-branch {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  margin-top: 8px;
  padding-left: 16px;
}

.pf-yes, .pf-no {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pf-label {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.pf-yes .pf-label { background: rgba(52, 211, 153, 0.15); color: var(--accent-green); }
.pf-no .pf-label { background: rgba(248, 113, 113, 0.15); color: var(--accent-red); }

/* CRAG flow */
.crag-flow {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.crag-step {
  padding: 8px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
}

.crag-eval {
  background: rgba(251, 146, 60, 0.12);
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

.crag-arrow { color: var(--text-muted); font-weight: 700; }

.crag-branches {
  display: flex;
  gap: 12px;
  width: 100%;
  margin-top: 12px;
  flex-wrap: wrap;
}

.crag-branch {
  flex: 1;
  min-width: 140px;
  padding: 12px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.crag-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.crag-branch p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.crag-branch.correct { background: rgba(52, 211, 153, 0.1); border: 1px solid rgba(52, 211, 153, 0.2); }
.crag-branch.correct .crag-label { color: var(--accent-green); }

.crag-branch.incorrect { background: rgba(248, 113, 113, 0.1); border: 1px solid rgba(248, 113, 113, 0.2); }
.crag-branch.incorrect .crag-label { color: var(--accent-red); }

.crag-branch.ambiguous { background: rgba(251, 146, 60, 0.1); border: 1px solid rgba(251, 146, 60, 0.2); }
.crag-branch.ambiguous .crag-label { color: var(--accent-orange); }

/* Graph visual */
.graph-visual {
  margin: 20px 0;
  display: flex;
  justify-content: center;
}

.graph-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* RAPTOR tree */
.raptor-tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin: 20px 0;
  padding: 24px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-md);
}

.tree-level {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.tree-node {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
}

.tree-node.summary {
  background: rgba(167, 139, 250, 0.2);
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple);
}

.tree-node.cluster {
  background: rgba(34, 211, 238, 0.15);
  border: 1px solid rgba(34, 211, 238, 0.3);
  color: var(--accent-cyan);
}

.tree-node.leaf {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* ====== AGENTIC RAG ====== */
.agent-diagram {
  position: relative;
  padding: 40px 0;
}

.agent-loop {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.agent-step {
  text-align: center;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  min-width: 120px;
  transition: all 0.3s ease;
}

.agent-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.agent-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.agent-step h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.agent-step p {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.agent-plan:hover { border-color: var(--accent-purple); }
.agent-act:hover { border-color: var(--accent-cyan); }
.agent-observe:hover { border-color: var(--accent-green); }
.agent-reflect:hover { border-color: var(--accent-orange); }

.agent-connector {
  width: 48px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.agent-connector svg {
  width: 100%;
  height: auto;
}

.agent-loop-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 8px;
  color: var(--accent-purple);
}

.agent-loop-arrow svg {
  width: 100px;
  height: auto;
}

.agent-loop-arrow span {
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 4px;
}

.agent-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.agent-feature {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all 0.3s ease;
}

.agent-feature:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.agent-feature h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.agent-feature p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Bonus technique */
.bonus-technique {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 40px;
}

.bonus-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.bonus-header h4 {
  font-size: 1.1rem;
  font-weight: 700;
}

.bonus-technique p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ====== EVALUATION ====== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
}

.metric-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-sm);
}

.metric-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.metric-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.metric-faithfulness { background: rgba(167, 139, 250, 0.2); color: var(--accent-purple); }
.metric-relevancy { background: rgba(34, 211, 238, 0.2); color: var(--accent-cyan); }
.metric-precision { background: rgba(52, 211, 153, 0.2); color: var(--accent-green); }
.metric-recall { background: rgba(251, 146, 60, 0.2); color: var(--accent-orange); }

.metric-card h4 {
  font-size: 1rem;
  font-weight: 700;
}

.metric-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.metric-formula {
  margin-top: 12px;
}

.metric-formula code {
  display: block;
  padding: 8px 12px;
  font-size: 0.75rem;
  line-height: 1.5;
}

/* Tool cards */
.tool-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.3s ease;
}

.tool-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.tool-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.tool-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--accent-green);
  background: rgba(52, 211, 153, 0.1);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ====== BEST PRACTICES ====== */
/* Stack diagram */
.stack-diagram {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 48px;
}

.stack-layer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.stack-layer:hover {
  transform: scale(1.02);
}

.stack-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  min-width: 100px;
  flex-shrink: 0;
}

.stack-items {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.stack-app { background: rgba(167, 139, 250, 0.1); border: 1px solid rgba(167, 139, 250, 0.2); }
.stack-app .stack-label { color: var(--accent-purple); }

.stack-llm { background: rgba(99, 102, 241, 0.1); border: 1px solid rgba(99, 102, 241, 0.2); }
.stack-llm .stack-label { color: var(--accent-blue); }

.stack-rerank { background: rgba(34, 211, 238, 0.1); border: 1px solid rgba(34, 211, 238, 0.2); }
.stack-rerank .stack-label { color: var(--accent-cyan); }

.stack-embed { background: rgba(52, 211, 153, 0.1); border: 1px solid rgba(52, 211, 153, 0.2); }
.stack-embed .stack-label { color: var(--accent-green); }

.stack-search { background: rgba(251, 146, 60, 0.1); border: 1px solid rgba(251, 146, 60, 0.2); }
.stack-search .stack-label { color: var(--accent-orange); }

.stack-db { background: rgba(244, 114, 182, 0.1); border: 1px solid rgba(244, 114, 182, 0.2); }
.stack-db .stack-label { color: var(--accent-pink); }

/* Roadmap */
.roadmap {
  position: relative;
  padding-left: 48px;
  margin-bottom: 48px;
}

.roadmap::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-purple), var(--accent-green));
}

.roadmap-step {
  position: relative;
  margin-bottom: 32px;
}

.roadmap-step:last-child { margin-bottom: 0; }

.roadmap-marker {
  position: absolute;
  left: -40px;
  top: 4px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
}

.roadmap-marker span {
  font-size: 0.75rem;
  font-weight: 800;
  color: white;
}

.roadmap-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.roadmap-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Table */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.comparison-table th {
  background: var(--bg-card);
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.comparison-table tr:hover td {
  background: rgba(99, 102, 241, 0.03);
}

.comparison-table td strong {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* Tips grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.tip-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.3s ease;
}

.tip-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.tip-icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.tip-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ====== PAPERS TIMELINE ====== */
.papers-timeline {
  position: relative;
  padding-left: 80px;
}

.papers-timeline::before {
  content: '';
  position: absolute;
  left: 55px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.paper-item {
  position: relative;
  margin-bottom: 32px;
}

.paper-item:last-child { margin-bottom: 0; }

.paper-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-purple);
  border: 2px solid var(--bg-secondary);
}

.paper-year {
  position: absolute;
  left: -80px;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-purple);
  width: 36px;
  text-align: right;
}

.paper-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 0.3s ease;
}

.paper-content:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.paper-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.paper-authors {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.paper-content > p:last-child {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ====== FOOTER ====== */
.footer {
  padding: 60px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.footer-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.footer-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto;
}

/* ====== REVEAL ANIMATION ====== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====== RESPONSIVE ====== */
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .container { padding: 0 16px; }

  .hero { padding: 100px 0 60px; min-height: auto; }
  .hero-stats { gap: 24px; }
  .stat-number { font-size: 1.5rem; }

  .analogy-box { gap: 20px; padding: 32px 20px; }
  .analogy-vs { margin: 0 auto; }

  .pipeline { flex-direction: column; gap: 8px; }
  .pipeline-arrow { transform: rotate(90deg); width: 32px; }

  .concept-grid { grid-template-columns: 1fr; }
  .technique-grid { grid-template-columns: 1fr; }
  .technique-featured { grid-column: auto; }

  .hybrid-visual { flex-direction: column; }
  .rerank-visual { flex-direction: column; }

  .agent-loop { flex-direction: column; gap: 12px; }
  .agent-connector { transform: rotate(90deg); width: 36px; }

  .papers-timeline { padding-left: 50px; }
  .paper-year { left: -50px; }

  .tab-buttons { flex-direction: column; }

  .comparison-table { font-size: 0.75rem; }
  .comparison-table th, .comparison-table td { padding: 8px 10px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2.5rem; }
  .section-title { font-size: 1.75rem; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .problem-cards { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr 1fr; }
}

/* ====== SELECTION ====== */
::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

/* ====== ARCHITECTURE DIAGRAMS ====== */
.arch-diagram {
  margin: 32px 0 40px;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.arch-svg {
  width: 100%;
  min-width: 700px;
  height: auto;
  display: block;
  font-family: var(--font-sans);
}

.arch-svg text {
  font-family: var(--font-sans);
}

@media (max-width: 768px) {
  .arch-diagram {
    margin: 20px -16px 32px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  .arch-svg {
    min-width: 600px;
  }
}

/* ====== LANG SWITCH ====== */
.lang-switch {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 6px;
  margin-left: 12px;
  transition: all 0.2s;
  flex-shrink: 0;
}

.lang-switch:hover {
  color: var(--text-primary);
  border-color: var(--accent-purple);
  background: rgba(99,102,241,0.1);
}

/* ====== LANG TOGGLE ====== */
.lang-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2px;
  margin-left: 12px;
  flex-shrink: 0;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border: none;
  border-radius: 6px;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn.active {
  background: var(--accent-blue);
  color: white;
}

.lang-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

/* ====== SCROLLBAR ====== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}