/* =========================================================================
   ChainSpiral — design system
   Morpho-inspired: clean canvas, generous whitespace, one signature gradient,
   refined type. Light by default with a single dark contrast section.
   ========================================================================= */

:root {
  /* canvas */
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --bg-ink: #0a0c12;          /* dark sections */
  --surface: #ffffff;
  --surface-soft: #f4f6fa;

  /* ink */
  --ink: #0b0d14;
  --ink-2: #3a4254;
  --muted: #6b7385;
  --muted-2: #98a0b3;
  --line: #e9ecf2;
  --line-strong: #d9dee8;

  /* brand — spiral flow gradient (indigo → blue → cyan) */
  --accent: #2c5ff6;
  --accent-ink: #1d49d4;
  --accent-soft: #eef2ff;
  --grad: linear-gradient(110deg, #4f46e5 0%, #2c5ff6 45%, #16b8d6 100%);
  --grad-soft: linear-gradient(110deg, #eef0ff 0%, #eaf5fb 100%);

  /* risk semantics (used on monitoring) */
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  --ok: #10b981;

  /* shape */
  --r-sm: 10px;
  --r: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --shadow-sm: 0 1px 2px rgba(12, 16, 28, .05), 0 1px 1px rgba(12, 16, 28, .04);
  --shadow: 0 12px 34px -16px rgba(20, 28, 52, .22);
  --shadow-lg: 0 40px 90px -40px rgba(20, 28, 52, .35);

  --container: 1160px;
  --nav-h: 68px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo",
          "Pretendard", "Malgun Gothic", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: #d8e0ff; }

/* ---------- layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 24px; }
.section { padding: clamp(64px, 9vw, 132px) 0; }
.section--tight { padding: clamp(48px, 6vw, 88px) 0; }
.center { text-align: center; }
.lead { color: var(--muted); font-size: clamp(16px, 1.4vw, 19px); max-width: 60ch; }
.center .lead { margin-inline: auto; }

/* ---------- type ---------- */
h1, h2, h3, h4 { margin: 0; font-weight: 680; letter-spacing: -0.025em; line-height: 1.08; color: var(--ink); }
.h1 { font-size: clamp(38px, 6.2vw, 76px); font-weight: 720; }
.h2 { font-size: clamp(30px, 4.2vw, 50px); }
.h3 { font-size: clamp(21px, 2.4vw, 28px); letter-spacing: -0.02em; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent-ink);
}
.eyebrow::before { content: ""; width: 18px; height: 1.5px; background: var(--accent); border-radius: 2px; }
.center .eyebrow::before { display: none; }
.grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- buttons ---------- */
.btn {
  --pad-y: 11px; --pad-x: 20px;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: var(--pad-y) var(--pad-x);
  border-radius: 999px; font-weight: 580; font-size: 14.5px; letter-spacing: -0.01em;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-accent {
  position: relative; overflow: hidden; isolation: isolate; color: #fff; border-color: transparent;
  background: linear-gradient(110deg, #6366f1 0%, #2c5ff6 38%, #16b8d6 72%, #6366f1 100%);
  background-size: 280% 100%; background-position: 0% 50%;
  box-shadow: 0 8px 22px -10px rgba(44,95,246,.7);
  animation: btnFlow 4s linear infinite, btnGlow 2.4s ease-in-out infinite;
}
/* glossy diagonal light that sweeps across on its own */
.btn-accent::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 60%; z-index: 2; pointer-events: none;
  background: linear-gradient(100deg, rgba(255,255,255,0) 0%, rgba(255,255,255,.85) 50%, rgba(255,255,255,0) 100%);
  transform: translateX(-180%) skewX(-18deg); animation: btnSheen 3s ease-in-out infinite;
}
.btn-accent svg { transition: transform .25s ease; }
.btn-accent:hover {
  transform: translateY(-3px) scale(1.035);
  background-size: 200% 100%;
  box-shadow: 0 18px 38px -10px rgba(44,95,246,.95), 0 0 36px 2px rgba(22,184,214,.7);
  animation-duration: 1.8s, 1.2s; /* speed up flow + glow on hover */
}
.btn-accent:hover svg { transform: translateX(4px); }
.btn-accent:hover::after { animation-duration: 1.4s; } /* faster sheen on hover */
.btn-accent:active { transform: translateY(-1px) scale(1.01); }
@keyframes btnFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 280% 50%; }
}
@keyframes btnGlow {
  0%, 100% { box-shadow: 0 8px 22px -10px rgba(44,95,246,.7), 0 0 8px 0 rgba(44,95,246,.25); }
  50% { box-shadow: 0 12px 28px -8px rgba(44,95,246,.85), 0 0 32px 4px rgba(60,120,246,.6); }
}
@keyframes btnSheen {
  0% { transform: translateX(-180%) skewX(-18deg); }
  /* quick pass, then rest before repeating */
  35%, 100% { transform: translateX(320%) skewX(-18deg); }
}
@media (prefers-reduced-motion: reduce) {
  .btn-accent { animation: none; }
  .btn-accent::after { animation: none; opacity: 0; }
}
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-light { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.22); }
.btn-light:hover { background: rgba(255,255,255,.18); }
.btn-lg { --pad-y: 14px; --pad-x: 26px; font-size: 15.5px; }
.btn-link { color: var(--accent-ink); font-weight: 560; display: inline-flex; align-items: center; gap: 6px; }
.btn-link svg { width: 15px; height: 15px; transition: transform .2s ease; }
.btn-link:hover svg { transform: translateX(3px); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  background: rgba(255,255,255,.72); backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent; transition: border-color .25s ease, box-shadow .25s ease;
}
.nav.scrolled { border-color: var(--line); box-shadow: 0 1px 0 rgba(12,16,28,.02); }
.nav__row { height: var(--nav-h); display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 680; font-size: 17px; letter-spacing: -0.03em; }
.brand .mark { width: 26px; height: 26px; }
.brand .ver { font-size: 10px; font-weight: 600; color: var(--muted-2); padding: 2px 6px; border: 1px solid var(--line); border-radius: 999px; }
.nav__links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav__links a {
  font-size: 14px; font-weight: 500; color: var(--ink-2); padding: 8px 12px; border-radius: 9px;
  transition: background .15s ease, color .15s ease;
}
.nav__links a:hover { background: var(--surface-soft); color: var(--ink); }
.nav__links a.active { color: var(--ink); }
.nav__cta { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.nav__toggle { display: none; }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding-top: clamp(56px, 7vw, 96px); padding-bottom: clamp(40px, 5vw, 60px); }
.hero__glow {
  position: absolute; inset: -20% 0 auto 0; height: 620px; z-index: 0; pointer-events: none;
  background:
    radial-gradient(620px 360px at 78% 8%, rgba(22,184,214,.16), transparent 70%),
    radial-gradient(700px 420px at 20% -6%, rgba(79,70,229,.14), transparent 68%);
}
.hero__inner { position: relative; z-index: 1; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 9px; padding: 6px 13px 6px 9px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
  font-size: 13px; color: var(--ink-2); box-shadow: var(--shadow-sm); margin-bottom: 24px;
}
.hero__badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px rgba(16,185,129,.16); }
.hero h1 { max-width: 16ch; }
.hero .lead { margin-top: 22px; font-size: clamp(17px, 1.7vw, 21px); max-width: 56ch; }
.hero__actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero__note { margin-top: 16px; font-size: 13px; color: var(--muted-2); }

/* hero stage (animated flow graphic) */
.stage { position: relative; margin-top: clamp(46px, 6vw, 76px); }
.stage__card {
  position: relative; border: 1px solid var(--line); border-radius: var(--r-xl);
  background: linear-gradient(180deg, #fff, #fbfcfe); box-shadow: var(--shadow-lg); overflow: hidden;
}
.stage__bar { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: #fff; }
.stage__dots { display: flex; gap: 6px; }
.stage__dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--line-strong); }
.stage__title { font-size: 12.5px; color: var(--muted); font-weight: 540; }
.stage__pill { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--ok); background: #ecfdf5; border: 1px solid #c7f0dd; padding: 3px 9px; border-radius: 999px; font-weight: 560; }
.stage__pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); animation: pulse 1.8s ease-in-out infinite; }
.stage__svg { width: 100%; height: auto; display: block; background:
  radial-gradient(1px 1px at center, #e7ebf3 1px, transparent 1px) 0 0 / 26px 26px; }

@keyframes pulse { 0%,100% { opacity:1 } 50% { opacity:.35 } }

/* ---------- dark particle hero (home only) ---------- */
.hero--dark {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1100px 560px at 80% -12%, rgba(44,95,246,.24), transparent 60%),
    radial-gradient(900px 520px at 8% 0%, rgba(22,184,214,.16), transparent 60%),
    linear-gradient(180deg, #070811 0%, #0a0c16 72%, #0c0e1a 100%);
}
.hero--dark .hero__glow { display: none; }
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.hero--dark .hero__inner { position: relative; z-index: 1; }
.hero--dark h1 { color: #fff; }
.hero--dark .lead { color: rgba(255,255,255,.66); }
.hero--dark .hero__note { color: rgba(255,255,255,.42); }
.hero--dark .hero__badge { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.14); color: rgba(255,255,255,.82); box-shadow: none; }
.hero--dark .btn-ghost { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.22); }
.hero--dark .btn-ghost:hover { background: rgba(255,255,255,.18); border-color: transparent; transform: translateY(-1px); }
/* the product stage card stays light — it pops on the dark hero (Morpho-style) */
.hero--dark .stage__card { box-shadow: 0 50px 110px -34px rgba(0,0,0,.7); }

/* nav while over the dark hero — transparent with light text, switches to the solid light nav once scrolled past */
.nav--dark { background: linear-gradient(180deg, rgba(7,8,17,.66), rgba(7,8,17,0)); backdrop-filter: none; border-color: transparent !important; box-shadow: none !important; }
.nav--dark .brand, .nav--dark .nav__links a { color: #fff; }
.nav--dark .nav__links a:hover { background: rgba(255,255,255,.12); color: #fff; }
.nav--dark .brand .ver { color: rgba(255,255,255,.62); border-color: rgba(255,255,255,.24); }
.nav--dark .nav__cta .btn-ghost { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.22); }
.nav--dark .nav__toggle { color: #fff; background: transparent; border-color: rgba(255,255,255,.24); }

/* ---------- logos / trust strip ---------- */
.strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-soft); }
.strip__row { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; justify-content: center; padding: 26px 0; }
.strip__label { font-size: 12.5px; color: var(--muted-2); font-weight: 560; letter-spacing: .02em; }
.strip__item { font-size: 14.5px; font-weight: 600; color: var(--ink-2); opacity: .8; }

/* ---------- stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { padding: 26px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.stat__n { font-size: clamp(28px, 3.4vw, 40px); font-weight: 700; letter-spacing: -0.03em; }
.stat__l { margin-top: 6px; color: var(--muted); font-size: 14px; }

/* ---------- feature grid / cards ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  position: relative; padding: 28px; border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--surface); transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.card__ic { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: var(--grad-soft); color: var(--accent-ink); margin-bottom: 18px; }
.card__ic svg { width: 22px; height: 22px; }
.card h3 { font-size: 19px; }
.card p { color: var(--muted); margin: 10px 0 0; font-size: 15px; }
.card .btn-link { margin-top: 16px; }
.card--feature { padding: 30px; }
.card--dark { background: var(--bg-ink); border-color: rgba(255,255,255,.08); color: #fff; }
.card--dark h3 { color: #fff; }
.card--dark p { color: rgba(255,255,255,.62); }

/* split feature block */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 72px); align-items: center; }
.split--rev .split__media { order: -1; }
.split__media { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg-soft); padding: 18px; box-shadow: var(--shadow); }
.split ul.checks { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 12px; }
.checks li { display: flex; gap: 11px; align-items: flex-start; color: var(--ink-2); font-size: 15px; }
.checks li svg { width: 19px; height: 19px; flex: none; margin-top: 2px; color: var(--accent); }

/* ---------- alert demo (monitoring) ---------- */
.alerts { display: grid; gap: 10px; }
.alert {
  display: flex; gap: 12px; align-items: flex-start; padding: 13px 15px;
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface);
}
.alert .sev { width: 9px; height: 9px; border-radius: 50%; margin-top: 6px; flex: none; }
.alert.crit .sev { background: var(--danger); box-shadow: 0 0 0 4px rgba(239,68,68,.14); }
.alert.warn .sev { background: var(--warning); box-shadow: 0 0 0 4px rgba(245,158,11,.14); }
.alert.info .sev { background: var(--info); box-shadow: 0 0 0 4px rgba(59,130,246,.14); }
.alert__body { min-width: 0; }
.alert__top { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tag { font-size: 11px; font-weight: 640; padding: 2px 7px; border-radius: 6px; background: var(--surface-soft); color: var(--ink); }
.tag.chain { background: #eef2ff; color: var(--accent-ink); text-transform: capitalize; }
.kind { font-size: 12px; font-weight: 600; }
.crit .kind { color: var(--danger); } .warn .kind { color: var(--warning); } .info .kind { color: var(--info); }
.alert__time { margin-left: auto; font-size: 11px; color: var(--muted-2); font-family: var(--mono); }
.alert__msg { font-size: 13.5px; color: var(--muted); margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* severity legend chips */
.sevlegend { display: flex; gap: 8px; flex-wrap: wrap; }
.sevchip { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 560; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line); }
.sevchip i { width: 7px; height: 7px; border-radius: 50%; }

/* ---------- steps ---------- */
.steps { counter-reset: s; display: grid; gap: 2px; }
.step { display: grid; grid-template-columns: auto 1fr; gap: 20px; padding: 26px 0; border-top: 1px solid var(--line); }
.step:last-child { border-bottom: 1px solid var(--line); }
.step__n { counter-increment: s; font-family: var(--mono); font-size: 13px; color: var(--accent-ink); font-weight: 600; padding-top: 4px; }
.step__n::before { content: "0" counter(s); }
.step h3 { font-size: 20px; }
.step p { color: var(--muted); margin: 8px 0 0; max-width: 60ch; }

/* ---------- dark CTA ---------- */
.cta-dark { background: var(--bg-ink); color: #fff; border-radius: var(--r-xl); padding: clamp(40px, 6vw, 72px); position: relative; overflow: hidden; }
.cta-dark::after { content: ""; position: absolute; inset: auto -10% -60% auto; width: 520px; height: 520px; background: radial-gradient(circle, rgba(44,95,246,.28), transparent 60%); }
.cta-dark__in { position: relative; z-index: 1; max-width: 50ch; }
.cta-dark h2 { color: #fff; }
.cta-dark p { color: rgba(255,255,255,.66); margin-top: 16px; }
.cta-dark .hero__actions { margin-top: 28px; }

/* ---------- page header (subpages) ---------- */
.phead { padding: clamp(56px, 8vw, 104px) 0 clamp(24px, 4vw, 44px); position: relative; overflow: hidden; }
.phead .hero__glow { height: 460px; }
.phead .lead { margin-top: 18px; }

/* doc layout */
.doc { display: grid; grid-template-columns: 220px 1fr; gap: 56px; align-items: start; }
.doc__nav { position: sticky; top: calc(var(--nav-h) + 24px); display: grid; gap: 2px; }
.doc__nav a { font-size: 14px; color: var(--muted); padding: 7px 12px; border-radius: 8px; border-left: 2px solid transparent; transition: color .2s ease, background .2s ease, border-color .2s ease; }
.doc__nav a:hover { color: var(--ink); background: var(--surface-soft); }
.doc__nav a.active { color: var(--accent-ink); background: var(--surface-soft); border-left-color: var(--accent); font-weight: 560; }
.doc__body h2 { margin-top: 8px; }
.doc__body h3 { margin-top: 40px; }
.doc__body p { color: var(--ink-2); margin: 14px 0; }
.doc__body ul { color: var(--ink-2); padding-left: 20px; }
.doc__body li { margin: 8px 0; }
.callout { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--bg-soft); border-radius: var(--r-sm); padding: 16px 18px; margin: 22px 0; color: var(--ink-2); font-size: 14.5px; }
code { font-family: var(--mono); font-size: .9em; background: var(--surface-soft); border: 1px solid var(--line); padding: 1.5px 6px; border-radius: 6px; }

/* coverage table */
.tablewrap { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: var(--surface); }
table.cov { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.cov th, .cov td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.cov th { font-weight: 600; color: var(--muted); font-size: 12.5px; letter-spacing: .04em; text-transform: uppercase; background: var(--bg-soft); }
.cov tr:last-child td { border-bottom: 0; }
.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 560; padding: 3px 10px; border-radius: 999px; }
.pill.on { background: #ecfdf5; color: #047857; }
.pill.soon { background: #fef3c7; color: #92600a; }

/* docs — figures + "what it provides / when to use" detail grids */
.doc-fig { margin: 26px 0 8px; }
.doc-fig__media { border: 1px solid var(--line); border-radius: var(--r); background: var(--bg-soft); padding: 14px; overflow: hidden; }
.doc-fig__media svg { width: 100%; height: auto; display: block; border-radius: 10px; }
.doc-fig figcaption { margin-top: 11px; font-size: 13px; color: var(--muted); text-align: center; }
.doc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 22px 0; }
.doc-box { border: 1px solid var(--line); border-radius: var(--r-sm); padding: 18px 20px; background: var(--surface); }
.doc-box.use { border-color: rgba(44,95,246,.18); background: linear-gradient(180deg, #fbfcff, #fff); }
.doc-box h4 { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--accent-ink); margin: 0 0 10px; display: flex; align-items: center; gap: 7px; }
.doc-box h4 svg { width: 15px; height: 15px; }
.doc-box ul { margin: 0; padding-left: 2px; list-style: none; }
.doc-box li { margin: 9px 0; font-size: 14px; color: var(--ink-2); padding-left: 20px; position: relative; line-height: 1.5; }
.doc-box li::before { content: ""; position: absolute; left: 2px; top: 8px; width: 6px; height: 6px; border-radius: 2px; background: var(--accent); }
.doc-box.use li::before { background: #16b8d6; }
.doc-legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 14px 0 4px; font-size: 13px; color: var(--ink-2); }
.doc-legend span { display: inline-flex; align-items: center; gap: 7px; }
.doc-legend i { width: 11px; height: 11px; border-radius: 50%; flex: none; }
@media (max-width: 960px) { .doc-grid { grid-template-columns: 1fr; } }

/* chips row */
.chips { display: flex; gap: 10px; flex-wrap: wrap; }
.chip { font-size: 13.5px; font-weight: 540; color: var(--ink-2); padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.chip:hover { border-color: var(--line-strong); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 64px 0 36px; }
.foot__grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.foot__brand p { color: var(--muted); font-size: 14px; max-width: 36ch; margin: 16px 0 0; }
.foot h4 { font-size: 12.5px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted-2); font-weight: 620; margin-bottom: 14px; }
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.foot ul a { color: var(--ink-2); font-size: 14.5px; }
.foot ul a:hover { color: var(--accent-ink); }
.foot__bottom { margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 13px; }
.foot__bottom a { color: var(--muted); }

/* ---------- reveal animation ---------- */
/* gentle, quick fade+rise; triggers early so nothing "pops" in late on scroll */
.reveal { opacity: 0; transform: translateY(8px); transition: opacity .45s ease-out, transform .45s ease-out; will-change: opacity, transform; }
.reveal.in { opacity: 1; transform: none; }

/* home page: Morpho-style reveal — content "wells up" smoothly (gentle fade + rise + subtle scale),
   no harsh 3D tilt. Soft, elegant ease-out so sections materialize as they scroll into view. */
.home .reveal {
  opacity: 0;
  transform: translateY(30px) scale(.985);
  transition: opacity .8s cubic-bezier(.22,.61,.36,1), transform .9s cubic-bezier(.22,.61,.36,1);
  will-change: opacity, transform;
}
.home .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal, .home .reveal { opacity: 1; transform: none; transition: none; }
  * { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .split, .doc { grid-template-columns: 1fr; }
  .split--rev .split__media { order: 0; }
  .doc__nav { position: static; display: none; }
  .foot__grid { grid-template-columns: 1fr 1fr; }
  .foot__brand { grid-column: 1 / -1; }
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__toggle { display: inline-grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); margin-left: auto; }
  .nav__cta { margin-left: 12px; }
  .nav__cta .btn-ghost { display: none; }
  .nav.open .nav__links { display: flex; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 12px 24px 20px; gap: 2px; box-shadow: var(--shadow); }
  .nav.open .nav__links a { padding: 12px; font-size: 16px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .foot__grid { grid-template-columns: 1fr; }
  .hero__actions .btn { width: 100%; }
}

/* ---------- home: menu bar sits on the constellation ----------
   Pull the dark particle hero up UNDER the sticky nav so its starfield canvas
   shows through the (translucent) menu bar too — the nav reads as part of the sky.
   Content padding compensates so nothing hides behind the nav. */
.home .hero--dark {
  margin-top: calc(-1 * var(--nav-h));
  padding-top: calc(clamp(56px, 7vw, 96px) + var(--nav-h));
}
.home .nav--dark { background: linear-gradient(180deg, rgba(7,8,17,.5), rgba(7,8,17,0)); }

/* ---------- "Launch app" page-transition veil ----------
   On clicking a Launch link a dark panel glides up from the bottom of the screen,
   its top edge rounded as it rises then flattening once it covers — a smooth,
   modern "sheet" transition that makes the jump to the app feel intentional. */
.launch-veil {
  position: fixed; inset: 0; z-index: 9999; display: grid; place-items: center;
  background:
    radial-gradient(900px 600px at 50% 42%, rgba(44,95,246,.28), transparent 60%),
    radial-gradient(700px 500px at 70% 70%, rgba(22,184,214,.18), transparent 60%),
    linear-gradient(180deg, #070811 0%, #0a0c16 100%);
  border-radius: 32px 32px 0 0;
  box-shadow: 0 -30px 80px -20px rgba(44,95,246,.45);
  transform: translateY(100%);
  transition: transform .62s cubic-bezier(.16,1,.3,1), border-radius .35s ease .28s;
  will-change: transform;
}
.launch-veil.show { transform: translateY(0); border-radius: 0; }
.launch-veil__in {
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  transform: translateY(28px); opacity: 0;
  transition: transform .5s cubic-bezier(.16,1,.3,1) .18s, opacity .5s ease .18s;
}
.launch-veil.show .launch-veil__in { transform: none; opacity: 1; }
.launch-veil__spin { width: 56px; height: 56px; animation: launch-spin 1.1s linear infinite; }
.launch-veil__txt { color: #fff; font-size: 15px; font-weight: 600; letter-spacing: -0.02em; }
.launch-veil__txt span { color: rgba(255,255,255,.5); font-weight: 500; }
@keyframes launch-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .launch-veil { transition: opacity .25s ease; transform: none; opacity: 0; border-radius: 0; }
  .launch-veil.show { opacity: 1; }
  .launch-veil__in { transition: none; transform: none; opacity: 1; }
  .launch-veil__spin { animation: none; }
}

/* ============================ Dark mode ============================ */
:root[data-theme="dark"] {
  --bg: #0a0d16;
  --bg-soft: #0e121d;
  --bg-ink: #06070e;
  --surface: #141a28;
  --surface-soft: #1a2130;
  --ink: #eceff7;
  --ink-2: #c4cad8;
  --muted: #99a3b7;
  --muted-2: #6c7589;
  --line: #232a3b;
  --line-strong: #313a52;
  --accent-ink: #7d9bff;
  --accent-soft: #18203a;
  --grad-soft: linear-gradient(110deg, #161b30 0%, #112230 100%);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.45), 0 1px 1px rgba(0,0,0,.35);
  --shadow: 0 14px 36px -16px rgba(0,0,0,.65);
  --shadow-lg: 0 40px 90px -40px rgba(0,0,0,.75);
}
:root[data-theme="dark"] ::selection { background: #2a3a6a; }
:root[data-theme="dark"] .nav { background: rgba(12,16,26,.72); }
:root[data-theme="dark"] .nav.open .nav__links { background: var(--surface); border-color: var(--line); }
:root[data-theme="dark"] .btn-primary { background: var(--ink); color: #0a0d16; }
:root[data-theme="dark"] .stage { background: linear-gradient(180deg, #141a28, #0f1421); }
:root[data-theme="dark"] .stage__bar { background: #141a28; }
:root[data-theme="dark"] .stage__pill { background: #102a20; border-color: #1e4d39; }
:root[data-theme="dark"] .doc-box.use { background: linear-gradient(180deg, #161d2e, #141a28); }
:root[data-theme="dark"] .tag.chain { background: #1a2138; }
:root[data-theme="dark"] .pill.on { background: #102a20; color: #34d399; }
:root[data-theme="dark"] .pill.soon { background: #2a2310; color: #f6c453; }

/* theme toggle button */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; flex: 0 0 38px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink);
  cursor: pointer; transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.theme-toggle:hover { border-color: var(--ink); }
.theme-toggle svg { width: 18px; height: 18px; }
.nav--dark .theme-toggle { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.22); color: #fff; }

/* dark mode: remove the dotted grid on flow-map / diagram canvases */
:root[data-theme="dark"] .stage__svg { background: transparent !important; }
:root[data-theme="dark"] svg[style*="radial-gradient"] { background-image: none !important; background-color: transparent !important; }