/* ============================================================
   Janus — Design System  ·  "Neural Infrastructure"
   Premium dark, electric indigo / violet, glassmorphism + glow
   ============================================================ */

:root {
  /* surfaces */
  --bg: #070b16;
  --bg-2: #0a0f1e;
  --bg-soft: #0d1426;
  --bg-card: rgba(255, 255, 255, 0.028);
  --bg-card-2: rgba(255, 255, 255, 0.05);
  --bg-hover: rgba(255, 255, 255, 0.065);

  /* text */
  --text: #e9eefb;
  --text-muted: #99a4bd;
  --text-dim: #69748f;

  /* lines */
  --border: rgba(255, 255, 255, 0.08);
  --border-2: rgba(255, 255, 255, 0.135);
  --border-3: rgba(255, 255, 255, 0.22);

  /* brand palette */
  --primary: #6366f1;
  --primary-2: #818cf8;
  --primary-dark: #4f46e5;
  --violet: #a855f7;
  --violet-2: #c084fc;
  --blue: #3b82f6;
  --blue-2: #60a5fa;
  --cyan: #22d3ee;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #fb7185;

  /* gradients */
  --grad: linear-gradient(118deg, #818cf8 0%, #6366f1 36%, #a855f7 70%, #60a5fa 100%);
  --grad-soft: linear-gradient(118deg, rgba(129, 140, 248, 0.16), rgba(168, 85, 247, 0.16));
  --grad-text: linear-gradient(108deg, #d3dbff 0%, #a5b4fc 24%, #c98bff 54%, #93c5fd 80%, #cdd6ff 100%);
  --grad-line: linear-gradient(90deg, transparent, rgba(129, 140, 248, 0.5), rgba(168, 85, 247, 0.5), transparent);

  /* glow + shadow */
  --glow-btn: 0 10px 30px -8px rgba(99, 102, 241, 0.7), 0 0 0 1px rgba(129, 140, 248, 0.3) inset;
  --glow-soft: 0 0 70px -16px rgba(124, 108, 247, 0.55);
  --shadow-card: 0 1px 0 0 rgba(255, 255, 255, 0.05) inset, 0 30px 70px -34px rgba(0, 0, 0, 0.85);
  --shadow-pop: 0 40px 90px -30px rgba(0, 0, 0, 0.9);

  /* radii */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* fonts */
  --mono: 'SF Mono', ui-monospace, 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Consolas, monospace;
  --sans: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Roboto, Helvetica, Arial, sans-serif;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --maxw: 1140px;
}

/* ---------- reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
::selection { background: rgba(129, 140, 248, 0.32); color: #fff; }
:focus-visible { outline: 2px solid var(--primary-2); outline-offset: 3px; border-radius: 4px; }

/* ---------- animated background ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(1200px 800px at 78% -8%, rgba(99, 102, 241, 0.18), transparent 60%),
    radial-gradient(1000px 700px at 8% 12%, rgba(168, 85, 247, 0.14), transparent 55%),
    var(--bg);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
  will-change: transform;
}
.orb-1 { width: 520px; height: 520px; left: -120px; top: -80px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.55), transparent 68%);
  animation: drift1 26s var(--ease) infinite alternate; }
.orb-2 { width: 620px; height: 620px; right: -160px; top: 6%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.42), transparent 68%);
  animation: drift2 32s var(--ease) infinite alternate; }
.orb-3 { width: 540px; height: 540px; left: 28%; bottom: -220px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.38), transparent 68%);
  animation: drift3 30s var(--ease) infinite alternate; }
@keyframes drift1 { to { transform: translate3d(120px, 90px, 0) scale(1.12); } }
@keyframes drift2 { to { transform: translate3d(-90px, 70px, 0) scale(1.08); } }
@keyframes drift3 { to { transform: translate3d(70px, -90px, 0) scale(1.15); } }
@media (prefers-reduced-motion: reduce) { .orb { animation: none; } }

.bg-grid {
  position: absolute;
  inset: -2px;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 80%);
}
.bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* ---------- layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 11, 22, 0.62);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: var(--maxw);
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  height: 68px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.nav-logo img { filter: drop-shadow(0 2px 10px rgba(99, 102, 241, 0.5)); }
.nav-links {
  display: flex;
  gap: 30px;
  align-items: center;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s var(--ease);
  position: relative;
}
.nav-links a:not(.lang-switch)::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--grad-line);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}
.nav-links a:not(.lang-switch):hover { color: var(--text); }
.nav-links a:not(.lang-switch):hover::after { transform: scaleX(1); }
.lang-switch {
  padding: 6px 13px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--text);
  transition: all 0.2s var(--ease);
}
.lang-switch:hover { border-color: var(--border-3); background: var(--bg-hover); }

/* mobile toggle (pure CSS) */
.nav-toggle { display: none; }
.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
}
.nav-toggle-label span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--glow-btn);
  background-size: 160% 160%;
  background-position: 0% 50%;
}
.btn-primary:hover {
  transform: translateY(-2px);
  background-position: 100% 50%;
  box-shadow: 0 16px 44px -10px rgba(124, 108, 247, 0.85), 0 0 0 1px rgba(129, 140, 248, 0.4) inset;
}
.btn-secondary {
  border: 1px solid var(--border-2);
  color: var(--text);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--border-3);
  background: var(--bg-hover);
  box-shadow: var(--shadow-card);
}

/* ---------- generic section ---------- */
section { padding: 92px 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary-2);
  padding: 6px 14px;
  border: 1px solid rgba(129, 140, 248, 0.25);
  border-radius: var(--radius-pill);
  background: rgba(99, 102, 241, 0.08);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary-2);
  box-shadow: 0 0 10px var(--primary-2);
}
section h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  text-align: center;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ---------- glass card base ---------- */
.glass {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.glass::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
}

/* ---------- hero ---------- */
.hero { padding: 120px 0 96px; text-align: center; position: relative; }
.hero .container { position: relative; z-index: 1; }
.hero-glow {
  position: absolute;
  top: -40px; left: 50%;
  transform: translateX(-50%);
  width: 900px; height: 420px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.28), rgba(168, 85, 247, 0.12) 40%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 9px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 30px;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.hero-badge:hover { border-color: var(--border-3); transform: translateY(-1px); }
.hero-badge .tag {
  background: var(--grad);
  color: #fff;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
}
.hero-badge .arrow { color: var(--text-dim); transition: transform 0.25s var(--ease); }
.hero-badge:hover .arrow { transform: translateX(3px); color: var(--text); }
.hero h1 {
  font-size: clamp(40px, 7vw, 76px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.042em;
  margin-bottom: 26px;
}
.hero h1 .grad {
  background: var(--grad-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: shimmer 8s linear infinite;
}
@keyframes shimmer { to { background-position: 200% center; } }
.hero-subtitle {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 42px;
  line-height: 1.6;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-meta {
  margin-top: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  justify-content: center;
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 500;
}
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta span::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

/* ---------- problems ---------- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.problem-card {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease), background 0.3s var(--ease);
  overflow: hidden;
}
.problem-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  pointer-events: none;
}
.problem-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-2);
  border-color: transparent;
}
.problem-card:hover::after { opacity: 0.6; }
.problem-icon {
  width: 46px; height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  border-radius: 12px;
  background: var(--grad-soft);
  border: 1px solid var(--border-2);
  margin-bottom: 16px;
}
.problem-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.problem-card p { color: var(--text-muted); font-size: 14px; margin-bottom: 16px; }
.solution {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--green);
  font-size: 13.5px;
  font-weight: 600;
}
.solution::before {
  content: '';
  width: 16px; height: 16px;
  border-radius: 50%;
  background: rgba(52, 211, 153, 0.15);
  box-shadow: inset 0 0 0 1px rgba(52, 211, 153, 0.4);
}

/* ---------- features ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease);
}
.feature:hover { transform: translateY(-4px); border-color: var(--border-2); }
.feature h3 {
  font-size: 17.5px;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.feature h3 .fi {
  width: 34px; height: 34px;
  flex: 0 0 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  border-radius: 9px;
  background: var(--grad-soft);
  border: 1px solid var(--border-2);
}
.feature ul { list-style: none; }
.feature li {
  font-size: 14px;
  color: var(--text-muted);
  padding: 7px 0;
  padding-left: 24px;
  position: relative;
  line-height: 1.55;
}
.feature li::before {
  content: '';
  position: absolute;
  left: 0; top: 13px;
  width: 14px; height: 8px;
  border-left: 2px solid var(--green);
  border-bottom: 2px solid var(--green);
  transform: rotate(-45deg);
  border-radius: 0 0 0 1px;
}

/* ---------- quickstart preview / code ---------- */
.section-code { background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.035), transparent); }
.code-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: start;
}
.code-window {
  border-radius: var(--radius);
  background: #060912;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease);
}
.code-window:hover { transform: translateY(-4px); border-color: var(--border-2); }
.code-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--border);
}
.code-dots { display: flex; gap: 6px; }
.code-dots i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.code-dots i:nth-child(1) { background: #fb7185; }
.code-dots i:nth-child(2) { background: #fbbf24; }
.code-dots i:nth-child(3) { background: #34d399; }
.code-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 6px;
  letter-spacing: 0.01em;
}
.code-window pre {
  padding: 18px 18px 20px;
  overflow-x: auto;
  margin: 0;
}
.code-window pre code,
pre code {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: #c8d3e6;
  white-space: pre;
}
/* syntax tokens */
.tok-k { color: #c084fc; }      /* keyword */
.tok-s { color: #86efac; }      /* string */
.tok-n { color: #fbbf24; }      /* number */
.tok-c { color: #5b6478; font-style: italic; } /* comment */
.tok-f { color: #60a5fa; }      /* function */
.tok-t { color: #22d3ee; }      /* type / class */
.tok-p { color: #818cf8; }      /* property / key */
.tok-o { color: #94a3b8; }      /* operator */
.tok-d { color: #cbd5e1; }      /* default */
.tok-co { color: #f9a8d4; }     /* decorator */

/* code blocks used on doc pages */
.doc-content pre,
.code-block pre { background: #060912; }
.doc-content pre { border: 1px solid var(--border); border-radius: var(--radius-sm); }

/* ---------- scenarios ---------- */
.scenario-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.scenario {
  position: relative;
  text-align: left;
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease);
  overflow: hidden;
}
.scenario::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad);
  opacity: 0.7;
}
.scenario:hover { transform: translateY(-4px); border-color: var(--border-2); }
.scenario h3 { font-size: 19px; font-weight: 700; margin-bottom: 14px; letter-spacing: -0.01em; }
.scenario .chain {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--primary-2);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.scenario p { color: var(--text-muted); font-size: 14.5px; }
.scenario-detail { font-size: 13px; opacity: 0.85; line-height: 1.55; }

/* ---------- ecosystem ---------- */
.ecosystem { text-align: center; }
.ecosystem-subtitle {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: -0.01em;
}
.eco-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 36px;
}
.eco-pill {
  padding: 9px 18px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.25s var(--ease);
}
.eco-pill:hover { transform: translateY(-2px); border-color: var(--border-3); background: var(--bg-hover); box-shadow: 0 8px 24px -12px rgba(99, 102, 241, 0.4); }

/* ---------- final CTA ---------- */
.cta-band { padding: 64px 0 110px; }
.cta-card {
  position: relative;
  text-align: center;
  padding: 64px 32px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(600px 300px at 50% -20%, rgba(99, 102, 241, 0.28), transparent 70%),
    var(--bg-card);
  border: 1px solid var(--border-2);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
  box-shadow: var(--shadow-pop);
}
.cta-card h2 { margin-bottom: 14px; }
.cta-card p { color: var(--text-muted); font-size: 17px; max-width: 480px; margin: 0 auto 30px; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 60px 0 36px;
  background: rgba(7, 11, 22, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.02em; }
.footer-brand img { filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.4)); }
.footer-links { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.footer-col a {
  display: block;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  padding: 5px 0;
  transition: color 0.2s var(--ease);
}
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 26px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13.5px;
}

/* ============================================================
   FLOW DIAGRAMS (replace ASCII art)
   ============================================================ */
.flow {
  margin: 28px 0 8px;
  padding: 40px 24px;
  border-radius: var(--radius);
  background:
    radial-gradient(500px 240px at 50% 50%, rgba(99, 102, 241, 0.08), transparent 70%),
    rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border);
  overflow-x: auto;
}
.flow-row {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  min-width: max-content;
}
.flow-node {
  flex: 0 0 auto;
  min-width: 130px;
  max-width: 170px;
  padding: 18px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-card-2);
  border: 1px solid var(--border-2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  text-align: center;
  position: relative;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease);
}
.flow-node:hover { transform: translateY(-3px); box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.4), 0 14px 40px -16px rgba(99, 102, 241, 0.6); }
.flow-node .fn-ico { font-size: 22px; margin-bottom: 8px; line-height: 1; }
.flow-node .fn-name { font-size: 14px; font-weight: 700; letter-spacing: -0.01em; }
.flow-node .fn-sub { font-size: 11.5px; color: var(--text-dim); margin-top: 3px; }
.flow-node.is-broker {
  background: var(--grad-soft);
  border-color: rgba(129, 140, 248, 0.4);
  box-shadow: 0 0 40px -10px rgba(99, 102, 241, 0.5);
}
.flow-node.is-broker .fn-sub { color: var(--primary-2); }
.flow-arrow {
  flex: 0 0 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.flow-arrow::before {
  content: '';
  width: 100%;
  height: 2px;
  background: var(--grad-line);
  border-radius: 2px;
}
.flow-arrow::after {
  content: '';
  position: absolute;
  right: 2px;
  width: 0; height: 0;
  border-left: 7px solid var(--primary-2);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  filter: drop-shadow(0 0 4px rgba(129, 140, 248, 0.7));
}
/* vertical drop to hub */
.flow-drop {
  display: flex;
  justify-content: center;
  margin: 0;
  height: 46px;
  position: relative;
}
.flow-drop .vd-line {
  width: 2px;
  height: 100%;
  background: var(--grad-line);
  border-radius: 2px;
}
.flow-drop .vd-line.dashed {
  background: none;
  border-left: 2px dashed rgba(129, 140, 248, 0.45);
}
.flow-hub-row { display: flex; justify-content: center; margin-top: 0; }
/* bus line spanning nodes */
.flow-bus {
  position: relative;
  height: 2px;
  margin: 0 auto;
  background: var(--grad-line);
  border-radius: 2px;
  max-width: 100%;
}
.flow-stack { display: flex; flex-direction: column; align-items: center; gap: 0; }

/* ============================================================
   DOC PAGES
   ============================================================ */
.breadcrumb {
  max-width: 760px;
  margin: 0 auto;
  padding: 26px 28px 0;
  font-size: 13.5px;
  color: var(--text-dim);
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color 0.2s var(--ease); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span { margin: 0 8px; color: var(--text-dim); }

.doc-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 28px 110px;
}
.doc-content h1 {
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.doc-content > p:first-of-type {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 8px;
}
.doc-content h2 {
  font-size: 27px;
  font-weight: 800;
  letter-spacing: -0.028em;
  margin: 52px 0 16px;
  text-align: left;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.doc-content h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 30px 0 12px;
}
.doc-content p { color: var(--text-muted); line-height: 1.8; }
.doc-content p strong { color: var(--text); }
.doc-content ul, .doc-content ol { padding-left: 22px; margin: 14px 0; }
.doc-content li { margin: 8px 0; color: var(--text-muted); line-height: 1.75; }
.doc-content li strong { color: var(--text); }
.doc-content a { color: var(--primary-2); text-decoration: none; border-bottom: 1px solid rgba(129, 140, 248, 0.3); transition: border-color 0.2s var(--ease); }
.doc-content a:hover { border-color: var(--primary-2); }
.doc-content pre {
  background: #060912;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  overflow-x: auto;
  margin: 18px 0;
}
.doc-content code {
  font-family: var(--mono);
  font-size: 13.5px;
  color: #c8d3e6;
}
.doc-content p code, .doc-content li code {
  background: rgba(129, 140, 248, 0.12);
  border: 1px solid var(--border-2);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 12.5px;
  color: #c7d2fe;
}
.doc-content pre code { font-size: 13px; background: none; border: none; padding: 0; color: #c8d3e6; }

/* doc cards */
.doc-content .step,
.doc-content .concept-card,
.doc-content .sdk-tab,
.doc-content .framework-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin: 22px 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.doc-content .step::before,
.doc-content .framework-card::before,
.doc-content .concept-card::before,
.doc-content .sdk-tab::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.16), transparent);
}
.doc-content .step h3, .doc-content .framework-card h3, .doc-content .concept-card h3, .doc-content .sdk-tab h3 { margin-top: 0; }
.doc-content .concept-card p:last-child { margin-bottom: 0; }

/* method grid (sdk) */
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0;
}
.method-item {
  background: rgba(129, 140, 248, 0.06);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 14px;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.method-item:hover { border-color: rgba(129, 140, 248, 0.4); background: rgba(129, 140, 248, 0.1); }
.method-item .method-name { font-family: var(--mono); font-weight: 600; color: var(--primary-2); font-size: 13px; }
.method-item .method-desc { color: var(--text-muted); font-size: 12.5px; margin-top: 2px; }

/* endpoints (api) */
.doc-content .endpoint {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 15px 18px;
  margin: 12px 0;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.doc-content .endpoint:hover { border-color: var(--border-2); transform: translateX(2px); }
.doc-content .endpoint .method {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 5px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.04em;
  margin-right: 10px;
  vertical-align: middle;
}
.doc-content .endpoint .method.get { background: rgba(52, 211, 153, 0.14); color: #6ee7b7; }
.doc-content .endpoint .method.post { background: rgba(129, 140, 248, 0.14); color: #a5b4fc; }
.doc-content .endpoint .method.put { background: rgba(251, 191, 36, 0.14); color: #fcd34d; }
.doc-content .endpoint .method.delete { background: rgba(251, 113, 133, 0.14); color: #fda4af; }
.doc-content .endpoint .path { font-family: var(--mono); font-size: 14px; color: var(--text); }
.doc-content .endpoint .desc { font-size: 13px; color: var(--text-muted); margin-top: 6px; }
.doc-content .endpoint .desc code { background: rgba(129, 140, 248, 0.1); padding: 1px 5px; border-radius: 4px; font-size: 12px; color: #c7d2fe; }

/* tables */
.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.doc-content th, .doc-content td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); }
.doc-content tr:last-child td { border-bottom: none; }
.doc-content th { color: var(--text); font-weight: 700; background: var(--bg-card-2); letter-spacing: -0.01em; }
.doc-content td { color: var(--text-muted); }
.doc-content td:first-child { font-family: var(--mono); color: var(--primary-2); }
.doc-content td:nth-child(2) { font-family: var(--mono); font-size: 12.5px; color: var(--text); }

/* notes */
.doc-content .note {
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.05));
  border: 1px solid rgba(129, 140, 248, 0.2);
  border-left: 3px solid var(--primary);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin: 22px 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.doc-content .note strong { color: var(--text); }
.doc-content .note code { background: rgba(129, 140, 248, 0.14); padding: 2px 6px; border-radius: 4px; font-size: 12.5px; color: #c7d2fe; }

/* doc page hero strip */
.doc-hero {
  position: relative;
  padding: 70px 0 0;
}
.doc-hero-glow {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 700px; height: 280px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.16), transparent 70%);
  filter: blur(16px);
  pointer-events: none;
}

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 980px) {
  .feature-grid, .code-blocks { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav-toggle-label { display: flex; }
  .nav-links {
    position: absolute;
    top: 68px; left: 16px; right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px;
    background: rgba(10, 15, 30, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-2);
    border-radius: var(--radius);
    box-shadow: var(--shadow-pop);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s var(--ease), opacity 0.3s var(--ease), padding 0.3s var(--ease);
    padding-top: 0; padding-bottom: 0;
  }
  .nav-toggle:checked ~ .nav-links {
    max-height: 420px;
    opacity: 1;
    padding: 14px;
  }
  .nav-links a { padding: 10px 12px; border-radius: 8px; }
  .nav-links a:not(.lang-switch)::after { display: none; }
  .nav-links a:hover { background: var(--bg-hover); }
  .lang-switch { text-align: center; margin-top: 6px; }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}
@media (max-width: 768px) {
  section { padding: 64px 0; }
  .hero { padding: 80px 0 60px; }
  .problem-grid, .feature-grid, .code-blocks, .scenario-flow { grid-template-columns: 1fr; }
  .footer-content { flex-direction: column; gap: 32px; }
  .footer-links { gap: 40px; }
  .method-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 10px 18px; }
  .cta-card { padding: 44px 22px; }
}
@media (max-width: 420px) {
  .container, .nav-container, .breadcrumb, .doc-content { padding-left: 18px; padding-right: 18px; }
  .btn { padding: 12px 22px; font-size: 14px; }
}