:root {
  --bg: #070b14;
  --bg-2: #0b1220;
  --panel: #0f1829;
  --panel-2: #131f35;
  --line: #1e2c47;
  --line-2: #2a3c5f;
  --text: #e6edf7;
  --muted: #93a3bd;
  --dim: #64748f;
  --accent: #38e1c6;   /* teal: flow / automation */
  --amber: #f5b84b;    /* amber: human gates */
  --violet: #8b9cff;   /* AI decision */
  --radius: 14px;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: var(--mono); }

/* ---------- bilingual ---------- */
html[data-lang="en"] [lang="zh"],
html:not([data-lang]) [lang="zh"] { display: none !important; }
html[data-lang="zh"] [lang="en"] { display: none !important; }

/* ---------- layout ---------- */
.wrap { width: min(1120px, 100% - 40px); margin: 0 auto; }
section { padding: 88px 0; border-top: 1px solid var(--line); }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 12px;
}
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.01em; }
h2 { font-size: clamp(26px, 3.4vw, 36px); margin-bottom: 14px; }
h3 { font-size: 18px; margin-bottom: 8px; }
.lead { color: var(--muted); font-size: 17px; max-width: 760px; margin: 0; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(7, 11, 20, .82); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: .01em; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.lang {
  display: inline-flex; border: 1px solid var(--line-2); border-radius: 999px; overflow: hidden;
  font-family: var(--mono); font-size: 12px;
}
.lang button {
  background: transparent; color: var(--muted); border: 0; padding: 6px 12px; cursor: pointer; font: inherit;
}
.lang button[aria-pressed="true"] { background: var(--accent); color: #04120f; font-weight: 700; }

/* ---------- hero ---------- */
.hero {
  position: relative; overflow: hidden; border-top: 0; padding: 96px 0 84px;
  background:
    radial-gradient(900px 420px at 80% -10%, rgba(56, 225, 198, .12), transparent 60%),
    radial-gradient(700px 380px at 0% 110%, rgba(139, 156, 255, .10), transparent 60%),
    var(--bg);
}
.hero::before { /* faint placement-grid / standard-cell rows */
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 30%, #000 0%, transparent 70%);
}
.hero .wrap { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; color: var(--amber);
  border: 1px solid rgba(245, 184, 75, .4); background: rgba(245, 184, 75, .08);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 22px;
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 10px var(--amber); }
.hero h1 { font-size: clamp(34px, 5vw, 54px); margin-bottom: 18px; }
.hero h1 .hl { color: var(--accent); }
.hero .lead { font-size: 18px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px;
  font-weight: 600; font-size: 15px; border: 1px solid var(--line-2); color: var(--text); background: var(--panel);
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #04120f; border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.hero-note { margin-top: 22px; font-size: 13px; color: var(--dim); }

/* cockpit illustration */
.cockpit {
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-2); border-radius: 16px; padding: 18px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .45), inset 0 1px 0 rgba(255, 255, 255, .03);
  font-family: var(--mono); font-size: 12.5px;
}
.cockpit-head { display: flex; align-items: center; gap: 8px; color: var(--muted); padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.dots { display: flex; gap: 6px; margin-right: 6px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--line-2); display: block; }
.cockpit-head .tag { margin-left: auto; color: var(--amber); border: 1px solid rgba(245,184,75,.35); padding: 1px 8px; border-radius: 6px; font-size: 11px; }
.lifecycle { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 12px 0; color: var(--dim); font-size: 11.5px; }
.lifecycle span { padding: 2px 8px; border: 1px solid var(--line-2); border-radius: 6px; }
.lifecycle span.on { color: var(--accent); border-color: var(--accent); background: rgba(56,225,198,.08); }
.stage-rows { display: grid; gap: 7px; }
.srow { display: grid; grid-template-columns: 110px 1fr 22px; gap: 10px; align-items: center; color: var(--muted); }
.cells { display: flex; gap: 4px; }
.cells b { flex: 1; height: 12px; border-radius: 3px; background: var(--line); }
.cells b.d { background: rgba(56, 225, 198, .75); }
.cells b.ai { background: rgba(139, 156, 255, .8); }
.cells b.h { background: var(--amber); }
.cells b.c { background: transparent; border: 1px dashed var(--accent); }
.gate { color: var(--amber); text-align: center; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--dim); font-size: 11px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; }
.caption { margin-top: 10px; font-size: 11px; color: var(--dim); font-family: var(--sans); }

/* ---------- status strip ---------- */
.strip { border-top: 1px solid var(--line); background: var(--bg-2); padding: 22px 0; }
.strip .wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.strip div { font-size: 14px; color: var(--muted); }
.strip strong { display: block; color: var(--text); font-family: var(--mono); font-size: 20px; }

/* ---------- cards ---------- */
.grid { display: grid; gap: 18px; margin-top: 40px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
  transition: border-color .2s ease;
}
.card:hover { border-color: var(--line-2); }
.card p { color: var(--muted); margin: 0; font-size: 15px; }
.card ul { color: var(--muted); margin: 10px 0 0; padding-left: 18px; font-size: 14.5px; }
.card li { margin: 4px 0; }
.icon {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 16px;
  background: rgba(56, 225, 198, .1); color: var(--accent); border: 1px solid rgba(56, 225, 198, .25);
  font-family: var(--mono); font-weight: 700; font-size: 14px;
}
.icon.amber { background: rgba(245,184,75,.1); color: var(--amber); border-color: rgba(245,184,75,.3); }
.icon.violet { background: rgba(139,156,255,.1); color: var(--violet); border-color: rgba(139,156,255,.3); }
.terminal {
  margin-top: 14px; background: #060a12; border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 14px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); overflow-x: auto; white-space: pre;
}
.terminal .p { color: var(--accent); }
.terminal .k { color: var(--violet); }

/* ---------- flow ---------- */
.pipeline { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 40px; counter-reset: st; }
.stage {
  position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px 16px 58px; display: flex; justify-content: space-between; gap: 14px; align-items: flex-start;
}
.stage::before {
  counter-increment: st; content: "0" counter(st);
  position: absolute; left: 18px; top: 17px;
  font-family: var(--mono); font-size: 13px; color: var(--accent);
}
.stage h3 { font-size: 15.5px; margin: 0 0 2px; }
.stage .zh { font-size: 13px; color: var(--muted); }
.stage .meta { font-family: var(--mono); font-size: 11.5px; color: var(--muted); display: flex; flex-direction: column; gap: 3px; text-align: right; white-space: nowrap; }
.stage .meta .g { color: var(--amber); }
.stage .meta .q { color: var(--accent); }
.types { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 22px; }
.type { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: var(--bg-2); }
.type .k { font-family: var(--mono); font-size: 12px; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.type .k i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }
.type p { margin: 0; color: var(--muted); font-size: 14px; }
.statechain {
  margin-top: 22px; padding: 16px 18px; border: 1px dashed var(--line-2); border-radius: 12px;
  font-family: var(--mono); font-size: 13px; color: var(--muted); overflow-x: auto; white-space: nowrap;
}
.statechain b { color: var(--text); font-weight: 600; }
.statechain .arr { color: var(--dim); margin: 0 8px; }

/* ---------- status / roadmap ---------- */
.honest {
  margin-top: 36px; padding: 20px 22px; border-radius: var(--radius);
  border: 1px solid rgba(245, 184, 75, .35); background: rgba(245, 184, 75, .06); color: var(--text);
}
.honest strong { color: var(--amber); }
.col h3 { display: flex; align-items: center; gap: 10px; }
.pill { font-family: var(--mono); font-size: 11px; padding: 2px 8px; border-radius: 6px; border: 1px solid; }
.pill.done { color: var(--accent); border-color: rgba(56,225,198,.4); }
.pill.no { color: #ff8a8a; border-color: rgba(255,138,138,.4); }
.pill.next { color: var(--violet); border-color: rgba(139,156,255,.4); }
.checks { list-style: none; padding: 0 !important; }
.checks li { position: relative; padding-left: 22px !important; }
.checks li::before { position: absolute; left: 0; top: 0; font-family: var(--mono); }
.checks.ok li::before { content: "✓"; color: var(--accent); }
.checks.x li::before { content: "✕"; color: #ff8a8a; }
.checks.n li::before { content: "→"; color: var(--violet); }

/* ---------- contact ---------- */
.contact-box {
  margin-top: 34px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;
  padding: 28px; border-radius: var(--radius); border: 1px solid var(--line-2);
  background: linear-gradient(120deg, rgba(56,225,198,.08), rgba(139,156,255,.06));
}
.contact-box .mail { font-family: var(--mono); font-size: clamp(18px, 2.6vw, 24px); color: var(--text); }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 36px 0 48px; color: var(--dim); font-size: 13px; }
footer .wrap { display: grid; gap: 10px; }
footer .row { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
footer .tm { max-width: 900px; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .types { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 880px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
  .g3 { grid-template-columns: 1fr; }
  .g2 { grid-template-columns: 1fr; }
  .strip .wrap { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .lang { margin-left: auto; }
}
@media (max-width: 520px) {
  section { padding: 64px 0; }
  .pipeline { grid-template-columns: 1fr; }
  .types { grid-template-columns: 1fr; }
  .srow { grid-template-columns: 84px 1fr 18px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* prevent grid children (with <pre>-like content) from forcing horizontal overflow */
.grid > *, .types > *, .pipeline > *, .hero .wrap > * { min-width: 0; }
.nowrap { white-space: nowrap; }
@media (max-width: 520px) { .terminal { white-space: pre-wrap; word-break: break-word; } }