/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a2e;
  --surface: rgba(255,255,255,0.03);
  --surface2: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08);
  --text: #e0e0e8;
  --text-dim: #8888a0;
  --accent: #6c63ff;
  --accent2: #00d4aa;
  --accent3: #ff6b6b;
  --accent4: #ffa726;
  --accent5: #42a5f5;
  --glow: 0 0 30px rgba(108,99,255,0.3);
  --glow2: 0 0 30px rgba(0,212,170,0.3);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg: #f5f5fa;
  --bg2: #eeeef4;
  --bg3: #e4e4ee;
  --surface: rgba(0,0,0,0.03);
  --surface2: rgba(0,0,0,0.06);
  --border: rgba(0,0,0,0.1);
  --text: #1a1a2e;
  --text-dim: #5a5a7a;
  --glow: 0 0 30px rgba(108,99,255,0.15);
  --glow2: 0 0 30px rgba(0,212,170,0.15);
}
[data-theme="light"] ::selection { background: var(--accent); color: #fff; }
[data-theme="light"] ::-webkit-scrollbar-track { background: var(--bg); }
[data-theme="light"] pre { background: #1e1e2e; color: #e6edf3; }
[data-theme="light"] .code-block { background: #1e1e2e; }
[data-theme="light"] .routing-input { background: #fff; }
[data-theme="light"] .routing-result { background: #fff; }
[data-theme="light"] .search-input { background: #fff; }
[data-theme="light"] .timeline-dot { background: var(--bg); }

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  position: fixed; bottom: 30px; left: 30px;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--accent); color: #fff; border: none;
  font-size: 1.3rem; cursor: pointer; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
  transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.theme-toggle:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(108,99,255,0.6); }

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #fff; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }
a { color: var(--accent2); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; text-shadow: var(--glow2); }

/* ===== PARTICLE CANVAS ===== */
#particles { position: fixed; inset: 0; z-index: 0; pointer-events: none; }

/* ===== PROGRESS BAR ===== */
#progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 9999;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent4));
  transition: width 0.1s linear; width: 0%;
  box-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent2);
}

/* ===== FLOATING NAV ===== */
.nav-float {
  position: fixed; top: 50%; right: 20px; transform: translateY(-50%);
  z-index: 1000; display: flex; flex-direction: column; gap: 8px;
}
.nav-dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--surface2); border: 2px solid var(--border);
  cursor: pointer; transition: var(--transition); position: relative;
}
.nav-dot:hover, .nav-dot.active {
  background: var(--accent); border-color: var(--accent);
  box-shadow: var(--glow); transform: scale(1.3);
}
.nav-dot .nav-label {
  position: absolute; right: 24px; top: 50%; transform: translateY(-50%);
  background: var(--bg3); color: var(--text); padding: 4px 12px;
  border-radius: var(--radius-sm); font-size: 0.75rem; white-space: nowrap;
  opacity: 0; pointer-events: none; transition: var(--transition);
  border: 1px solid var(--border);
}
.nav-dot:hover .nav-label { opacity: 1; }

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  position: relative; z-index: 1;
}
@media (min-width: 2000px) { .container { max-width: 1600px; } }
@media (min-width: 2560px) { .container { max-width: 1920px; } }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  position: relative; padding: 40px 24px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface2); border: 1px solid var(--border);
  padding: 8px 20px; border-radius: 100px; font-size: 0.85rem;
  color: var(--accent2); margin-bottom: 32px;
  animation: fadeSlideUp 0.8s ease both 0.2s;
}
.hero-badge .pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent2); animation: pulse 2s infinite;
}
.hero h1 {
  font-size: clamp(2.5rem, 7vw, 6rem); font-weight: 800;
  line-height: 1.05; margin-bottom: 24px;
  animation: fadeSlideUp 0.8s ease both 0.4s;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent2), var(--accent4));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-size: 200% 200%; animation: gradientShift 4s ease infinite;
}
.hero .subtitle {
  font-size: clamp(1rem, 2vw, 1.35rem); color: var(--text-dim);
  max-width: 700px; margin-bottom: 48px;
  animation: fadeSlideUp 0.8s ease both 0.6s;
}
.hero-chips {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
  margin-bottom: 48px; animation: fadeSlideUp 0.8s ease both 0.8s;
}
.chip {
  padding: 8px 18px; border-radius: 100px; font-size: 0.85rem;
  font-weight: 600; border: 1px solid; cursor: default;
  transition: var(--transition);
}
.chip:hover { transform: translateY(-2px); }
.chip--purple { background: rgba(108,99,255,0.1); border-color: rgba(108,99,255,0.3); color: var(--accent); }
.chip--green { background: rgba(0,212,170,0.1); border-color: rgba(0,212,170,0.3); color: var(--accent2); }
.chip--orange { background: rgba(255,167,38,0.1); border-color: rgba(255,167,38,0.3); color: var(--accent4); }
.chip--red { background: rgba(255,107,107,0.1); border-color: rgba(255,107,107,0.3); color: var(--accent3); }
.chip--blue { background: rgba(66,165,245,0.1); border-color: rgba(66,165,245,0.3); color: var(--accent5); }

.scroll-indicator {
  animation: fadeSlideUp 0.8s ease both 1s;
  position: absolute; bottom: 40px;
}
.scroll-arrow {
  width: 24px; height: 24px; border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent); transform: rotate(45deg);
  animation: bounce 2s infinite;
}

/* ===== SECTIONS ===== */
section { padding: 100px 0; position: relative; }
.section-header {
  text-align: center; margin-bottom: 64px;
}
.section-number {
  font-size: 0.85rem; font-weight: 700; color: var(--accent);
  letter-spacing: 3px; text-transform: uppercase; margin-bottom: 12px;
  display: flex; align-items: center; justify-content: center; gap: 12px;
}
.section-number::before, .section-number::after {
  content: ''; width: 40px; height: 1px; background: var(--accent); opacity: 0.4;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800;
  margin-bottom: 16px; line-height: 1.2;
}
.section-desc {
  font-size: 1.1rem; color: var(--text-dim); max-width: 600px; margin: 0 auto;
}

/* ===== CARDS ===== */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; position: relative;
  overflow: hidden; transition: var(--transition);
}
.card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%),
    rgba(108,99,255,0.06), transparent 40%);
  opacity: 0; transition: opacity 0.3s;
}
.card:hover::before { opacity: 1; }
.card:hover {
  border-color: rgba(108,99,255,0.2);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

/* ===== GRID LAYOUTS ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===== ICON BADGES ===== */
.icon-badge {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(108,99,255,0.15), rgba(108,99,255,0.05));
  border: 1px solid rgba(108,99,255,0.2);
}
.icon-badge--green {
  background: linear-gradient(135deg, rgba(0,212,170,0.15), rgba(0,212,170,0.05));
  border-color: rgba(0,212,170,0.2);
}
.icon-badge--orange {
  background: linear-gradient(135deg, rgba(255,167,38,0.15), rgba(255,167,38,0.05));
  border-color: rgba(255,167,38,0.2);
}
.icon-badge--red {
  background: linear-gradient(135deg, rgba(255,107,107,0.15), rgba(255,107,107,0.05));
  border-color: rgba(255,107,107,0.2);
}
.icon-badge--blue {
  background: linear-gradient(135deg, rgba(66,165,245,0.15), rgba(66,165,245,0.05));
  border-color: rgba(66,165,245,0.2);
}

.card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.card p { color: var(--text-dim); font-size: 0.95rem; }

/* ===== TABLE OF CONTENTS ===== */
.toc-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px; margin-top: 32px;
}
.toc-item {
  display: flex; align-items: center; gap: 16px; padding: 16px 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer;
  transition: var(--transition); text-decoration: none; color: var(--text);
}
.toc-item:hover {
  border-color: var(--accent); background: var(--surface2);
  transform: translateX(6px); color: #fff;
}
.toc-num {
  font-size: 1.5rem; font-weight: 800; color: var(--accent);
  min-width: 40px; text-align: center;
}
.toc-label { font-weight: 600; font-size: 0.95rem; }

/* ===== HARDWARE / SPECS ===== */
.spec-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.spec-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; position: relative; overflow: hidden;
}
.spec-card::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.spec-card--desktop::after { background: linear-gradient(90deg, var(--accent), var(--accent5)); }
.spec-card--macbook::after { background: linear-gradient(90deg, var(--accent2), var(--accent4)); }
.spec-card h4 {
  font-size: 1.1rem; font-weight: 700; margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px;
}
.spec-row {
  display: flex; justify-content: space-between; padding: 10px 0;
  border-bottom: 1px solid var(--border); font-size: 0.9rem;
}
.spec-row:last-child { border-bottom: none; }
.spec-label { color: var(--text-dim); }
.spec-value { font-weight: 600; color: var(--text); }

/* ===== CONCEPT EXPLAINERS ===== */
.concept-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: var(--transition);
}
.concept-header {
  padding: 20px 24px; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  font-weight: 700; font-size: 1.05rem;
  transition: var(--transition);
}
.concept-header:hover { background: var(--surface2); }
.concept-arrow {
  transition: transform 0.3s; font-size: 1.2rem; color: var(--accent);
}
.concept-card.open .concept-arrow { transform: rotate(180deg); }
.concept-body {
  max-height: 0; overflow: hidden; transition: max-height 0.5s cubic-bezier(0.4,0,0.2,1);
  padding: 0 24px;
}
.concept-card.open .concept-body { max-height: 600px; padding: 0 24px 24px; }
.concept-body p { color: var(--text-dim); font-size: 0.95rem; margin-bottom: 12px; }
.concept-highlight {
  background: rgba(108,99,255,0.08); border-left: 3px solid var(--accent);
  padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 12px 0;
  font-size: 0.9rem;
}

/* ===== MODEL COMPARISON ===== */
.model-table-wrap {
  overflow-x: auto; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface);
}
.model-table {
  width: 100%; border-collapse: collapse; font-size: 0.9rem;
}
.model-table th {
  padding: 16px 20px; text-align: left; font-weight: 700;
  background: var(--surface2); border-bottom: 1px solid var(--border);
  color: var(--accent); font-size: 0.8rem; text-transform: uppercase;
  letter-spacing: 1px; position: sticky; top: 0;
}
.model-table td {
  padding: 14px 20px; border-bottom: 1px solid var(--border);
}
.model-table tr:last-child td { border-bottom: none; }
.model-table tr:hover td { background: var(--surface2); }
.model-table .badge {
  display: inline-block; padding: 3px 10px; border-radius: 100px;
  font-size: 0.75rem; font-weight: 600;
}
.badge--moe { background: rgba(0,212,170,0.15); color: var(--accent2); }
.badge--dense { background: rgba(255,167,38,0.15); color: var(--accent4); }
.badge--star { background: rgba(108,99,255,0.15); color: var(--accent); }

/* ===== ARCHITECTURE DIAGRAM ===== */
.arch-diagram {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px; margin: 40px 0;
  position: relative; overflow: hidden;
}
.arch-layers {
  display: flex; flex-direction: column; gap: 24px; align-items: center;
}
.arch-layer {
  width: 100%; max-width: 800px; padding: 20px 28px;
  border-radius: var(--radius-sm); text-align: center;
  font-weight: 600; font-size: 0.95rem;
  position: relative; transition: var(--transition);
  cursor: default;
}
.arch-layer:hover { transform: scale(1.02); }
.arch-layer--you {
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(108,99,255,0.05));
  border: 1px solid rgba(108,99,255,0.3);
}
.arch-layer--orch {
  background: linear-gradient(135deg, rgba(0,212,170,0.2), rgba(0,212,170,0.05));
  border: 1px solid rgba(0,212,170,0.3);
}
.arch-layer--mcp {
  background: linear-gradient(135deg, rgba(255,167,38,0.2), rgba(255,167,38,0.05));
  border: 1px solid rgba(255,167,38,0.3);
}
.arch-layer--agents {
  background: linear-gradient(135deg, rgba(66,165,245,0.2), rgba(66,165,245,0.05));
  border: 1px solid rgba(66,165,245,0.3);
}
.arch-layer--cloud {
  background: linear-gradient(135deg, rgba(255,107,107,0.2), rgba(255,107,107,0.05));
  border: 1px solid rgba(255,107,107,0.3);
}
.arch-connector {
  width: 2px; height: 20px;
  background: linear-gradient(180deg, var(--accent), transparent);
  margin: 0 auto;
}
.arch-sub {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  margin-top: 10px;
}
.arch-sub-item {
  padding: 4px 12px; background: rgba(255,255,255,0.05);
  border-radius: 100px; font-size: 0.8rem; font-weight: 500;
  color: var(--text-dim);
}

/* ===== CODE BLOCKS ===== */
.code-block {
  background: #0d1117; border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden; margin: 20px 0;
}
.code-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border); font-size: 0.8rem;
}
.code-lang { color: var(--accent2); font-weight: 600; }
.code-copy {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  padding: 4px 12px; border-radius: 4px; cursor: pointer;
  font-size: 0.75rem; transition: var(--transition);
}
.code-copy:hover { border-color: var(--accent); color: var(--accent); }
.code-copy.copied { border-color: var(--accent2); color: var(--accent2); }
pre {
  padding: 20px; overflow-x: auto; font-family: 'Cascadia Code', 'Fira Code', monospace;
  font-size: 0.875rem; line-height: 1.7; color: #e6edf3;
}
.code-kw { color: #ff7b72; }
.code-str { color: #a5d6ff; }
.code-cm { color: #8b949e; }
.code-fn { color: #d2a8ff; }
.code-num { color: #79c0ff; }
.code-var { color: #ffa657; }

/* ===== AGENT CARDS ===== */
.agent-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.agent-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; transition: var(--transition);
  position: relative; overflow: hidden;
}
.agent-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.agent-card:nth-child(1)::before { background: var(--accent); }
.agent-card:nth-child(2)::before { background: var(--accent2); }
.agent-card:nth-child(3)::before { background: var(--accent5); }
.agent-card:nth-child(4)::before { background: var(--accent4); }
.agent-card:nth-child(5)::before { background: var(--accent3); }
.agent-card:nth-child(6)::before { background: #ab47bc; }
.agent-card:nth-child(7)::before { background: #26c6da; }
.agent-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.12); }
.agent-name { font-weight: 700; font-size: 1.1rem; margin-bottom: 4px; }
.agent-model { font-size: 0.8rem; color: var(--accent2); margin-bottom: 12px; }
.agent-desc { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 12px; }
.agent-cost {
  display: inline-block; padding: 3px 10px; border-radius: 100px;
  font-size: 0.75rem; font-weight: 600;
}
.agent-cost--free { background: rgba(0,212,170,0.15); color: var(--accent2); }
.agent-cost--paid { background: rgba(255,167,38,0.15); color: var(--accent4); }

/* ===== TIMELINE ===== */
.timeline { position: relative; padding-left: 40px; }
.timeline::before {
  content: ''; position: absolute; left: 15px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(180deg, var(--accent), var(--accent2), var(--accent4));
}
.timeline-item { position: relative; margin-bottom: 32px; }
.timeline-dot {
  position: absolute; left: -33px; top: 4px; width: 12px; height: 12px;
  border-radius: 50%; border: 2px solid var(--accent);
  background: var(--bg); z-index: 1;
}
.timeline-item:nth-child(even) .timeline-dot { border-color: var(--accent2); }
.timeline-content {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 20px 24px;
}
.timeline-step {
  font-size: 0.8rem; color: var(--accent); font-weight: 700;
  letter-spacing: 1px; margin-bottom: 6px;
}
.timeline-title { font-weight: 700; margin-bottom: 8px; }
.timeline-desc { font-size: 0.9rem; color: var(--text-dim); }

/* ===== QUANT TABLE ===== */
.quant-bar {
  height: 8px; border-radius: 4px; background: var(--surface2);
  overflow: hidden; margin-top: 8px;
}
.quant-fill {
  height: 100%; border-radius: 4px; transition: width 1.5s ease;
}

/* ===== TABS ===== */
.tabs { margin: 40px 0; }
.tab-header {
  display: flex; gap: 4px; margin-bottom: 24px; overflow-x: auto;
  border-bottom: 1px solid var(--border); padding-bottom: 0;
}
.tab-btn {
  padding: 12px 24px; background: none; border: none;
  color: var(--text-dim); font-size: 0.95rem; font-weight: 600;
  cursor: pointer; position: relative; transition: var(--transition);
  white-space: nowrap; border-bottom: 2px solid transparent;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; animation: fadeIn 0.4s ease; }
.tab-panel.active { display: block; }

/* ===== CALLOUT BOXES ===== */
.callout {
  padding: 20px 24px; border-radius: var(--radius-sm);
  margin: 20px 0; border-left: 4px solid;
  font-size: 0.95rem;
}
.callout--tip {
  background: rgba(0,212,170,0.06); border-color: var(--accent2); color: var(--text);
}
.callout--warn {
  background: rgba(255,167,38,0.06); border-color: var(--accent4);
}
.callout--danger {
  background: rgba(255,107,107,0.06); border-color: var(--accent3);
}
.callout--info {
  background: rgba(108,99,255,0.06); border-color: var(--accent);
}
.callout strong { display: block; margin-bottom: 6px; }

/* ===== FLOW DIAGRAM ===== */
.flow-row {
  display: flex; align-items: center; justify-content: center;
  flex-wrap: wrap; gap: 12px; margin: 16px 0;
}
.flow-box {
  padding: 10px 20px; border-radius: var(--radius-sm);
  background: var(--surface2); border: 1px solid var(--border);
  font-size: 0.85rem; font-weight: 600; text-align: center;
  transition: var(--transition); min-width: 120px;
}
.flow-box:hover { border-color: var(--accent); transform: scale(1.05); }
.flow-arrow { color: var(--accent); font-size: 1.2rem; }

/* ===== ANIMATED REVEAL ===== */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left {
  opacity: 0; transform: translateX(-40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right {
  opacity: 0; transform: translateX(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal-right.visible { opacity: 1; transform: translateX(0); }
.reveal-scale {
  opacity: 0; transform: scale(0.9);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal-scale.visible { opacity: 1; transform: scale(1); }

/* staggered children */
.stagger > * { transition-delay: calc(var(--i, 0) * 0.1s); }

/* ===== STAT COUNTER ===== */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 48px 0; }
.stat-card { text-align: center; }
.stat-num {
  font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 0.85rem; color: var(--text-dim); margin-top: 4px; }
@media (max-width: 640px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== INTERACTIVE SWITCH ===== */
.switch-group {
  display: flex; gap: 8px; background: var(--surface);
  padding: 4px; border-radius: 100px; border: 1px solid var(--border);
  width: fit-content; margin: 0 auto 32px;
}
.switch-btn {
  padding: 8px 24px; border: none; background: none;
  color: var(--text-dim); font-size: 0.9rem; font-weight: 600;
  border-radius: 100px; cursor: pointer; transition: var(--transition);
}
.switch-btn.active { background: var(--accent); color: #fff; }

/* ===== MCP SERVER LIST ===== */
.mcp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.mcp-item {
  display: flex; align-items: flex-start; gap: 14px; padding: 18px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: var(--transition);
}
.mcp-item:hover { border-color: var(--accent); transform: translateY(-2px); }
.mcp-icon {
  font-size: 1.5rem; min-width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
}
.mcp-name { font-weight: 700; font-size: 0.95rem; }
.mcp-desc { font-size: 0.8rem; color: var(--text-dim); margin-top: 2px; }

/* ===== FOOTER ===== */
footer {
  padding: 60px 0 40px; border-top: 1px solid var(--border);
  text-align: center; color: var(--text-dim); font-size: 0.85rem;
}
footer .footer-logo {
  font-size: 1.5rem; font-weight: 800; margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
  40% { transform: rotate(45deg) translateY(-10px); }
  60% { transform: rotate(45deg) translateY(-5px); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 5px rgba(108,99,255,0.3); }
  50% { box-shadow: 0 0 20px rgba(108,99,255,0.6), 0 0 40px rgba(108,99,255,0.2); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-float { display: none; }
  section { padding: 60px 0; }
  .container { padding: 0 16px; }
  .hero h1 { font-size: 2.2rem; }
  .arch-diagram { padding: 20px; }
  .tab-header { gap: 0; }
  .tab-btn { padding: 10px 16px; font-size: 0.85rem; }
}
@media (min-width: 2000px) {
  html { font-size: 18px; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 2560px) {
  html { font-size: 20px; }
  .agent-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ===== BACK TO TOP ===== */
.back-top {
  position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px;
  border-radius: 50%; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; border: none; font-size: 1.2rem; z-index: 1000;
  opacity: 0; transform: translateY(20px); transition: var(--transition);
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
}
.back-top.visible { opacity: 1; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(108,99,255,0.6); }

/* ===== GLOW DIVIDER ===== */
.glow-divider {
  height: 1px; border: none; margin: 0;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  opacity: 0.4;
}

/* ===== SEARCH BAR ===== */
.search-wrap {
  max-width: 500px; margin: 0 auto 40px; position: relative;
}
.search-input {
  width: 100%; padding: 14px 20px 14px 48px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 100px; color: var(--text); font-size: 0.95rem;
  outline: none; transition: var(--transition);
}
.search-input:focus { border-color: var(--accent); box-shadow: var(--glow); }
.search-icon {
  position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
  color: var(--text-dim); font-size: 1.1rem;
}

/* ===== QUICK-REF COMMAND ===== */
.cmd-list { display: flex; flex-direction: column; gap: 8px; }
.cmd-item {
  display: flex; align-items: center; gap: 16px; padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-family: 'Cascadia Code', monospace;
  font-size: 0.85rem; transition: var(--transition);
}
.cmd-item:hover { border-color: var(--accent); }
.cmd-label {
  font-family: 'Segoe UI', sans-serif; color: var(--text-dim);
  font-size: 0.8rem; min-width: 140px;
}

/* ===== TOOLTIP ===== */
[data-tooltip] {
  position: relative; cursor: help;
}
[data-tooltip]::after {
  content: attr(data-tooltip); position: absolute; bottom: 100%;
  left: 50%; transform: translateX(-50%) translateY(-4px);
  background: var(--bg3); color: var(--text); padding: 6px 12px;
  border-radius: 6px; font-size: 0.75rem; white-space: nowrap;
  opacity: 0; pointer-events: none; transition: var(--transition);
  border: 1px solid var(--border); z-index: 10;
}
[data-tooltip]:hover::after { opacity: 1; transform: translateX(-50%) translateY(-8px); }

/* ===== INTERACTIVE ROUTING DEMO ===== */
.routing-demo {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; margin: 32px 0;
  text-align: center;
}
.routing-input {
  width: 100%; max-width: 500px; padding: 14px 20px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 0.95rem;
  outline: none; transition: var(--transition); margin-bottom: 16px;
}
.routing-input:focus { border-color: var(--accent); }
.routing-result {
  padding: 16px; border-radius: var(--radius-sm);
  background: var(--bg); border: 1px solid var(--border);
  min-height: 60px; margin-top: 12px; text-align: left;
  font-size: 0.9rem;
}