/* TOUCHSTONE ◆ 试金石 — assets/theme.css
 * Light "assay office" theme (porcelain bg, ink text, assay gold, dark
 * sunken terminals as contrast objects). Shared by about/docs/gate pages. */
:root{
  --bg:#f4f2ec; --bg2:#ecebe3; --panel:#fbfaf7; --panel2:#ffffff;
  --well:#10141d;                    /* sunken: terminal, code, JSON — stays dark */
  --ink:#191c24; --dim:#5a5d68; --faint:#8f929c;
  --gold:#c9a227;                    /* fills, CTA background, bars */
  --gold-hi:#8a6c14;                 /* emphasized gold TEXT on light bg (darker for contrast) */
  --gold-soft:rgba(201,162,39,.12); --gold-line:rgba(168,130,30,.42);
  --green:#0e7d4f; --green-deep:#0a6b43;
  --green-soft:rgba(14,125,79,.09); --green-line:rgba(14,125,79,.32);
  --red:#c53a3a; --red-soft:rgba(197,58,58,.08); --red-line:rgba(197,58,58,.32);
  --amber:#a06e0e; --amber-soft:rgba(160,110,14,.10); --amber-line:rgba(160,110,14,.35);
  --paper:#f1ead9; --paper-edge:#e0d5bc; --ink-on-paper:#171a20;
  --line:rgba(25,28,36,.09); --line-soft:rgba(25,28,36,.06); --line-strong:rgba(25,28,36,.16);
  --hover:rgba(201,162,39,.07);
  --shadow:0 10px 34px rgba(25,28,36,.07); --shadow-lift:0 16px 44px rgba(25,28,36,.12);
  --display:"Space Grotesk","Noto Sans SC",sans-serif;
  --mono:"IBM Plex Mono","Noto Sans SC",monospace;
  --body:"Inter","Noto Sans SC",sans-serif;
  --rad:12px;
  /* fixed "contrast object" tokens — bright values, independent of the light status palette */
  --dark:#10141d; --dark2:#10141d; --dark-ink:#e9e4d8; --neon:#f0cc6a;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
/* film grain */
body::after{
  content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.05;
  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='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}
body{
  background:var(--bg);color:var(--ink);font-family:var(--body);
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
::selection{background:var(--gold);color:#171a20}

/* ---------- shared ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.eyebrow{
  font-family:var(--mono);font-size:12px;letter-spacing:.28em;
  color:var(--gold-hi);text-transform:uppercase;display:flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--gold-line)}
h2.sec-title{
  font-family:var(--display);font-size:clamp(30px,4.4vw,52px);
  font-weight:700;letter-spacing:-.02em;line-height:1.08;margin:18px 0 10px;
}
.sec-sub{color:var(--dim);font-size:16px;line-height:1.8;max-width:640px}
section{padding:110px 0;position:relative}
.mono{font-family:var(--mono)}

/* ---------- nav ---------- */
nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:rgba(246,244,238,.72);border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:11px;font-family:var(--display);font-weight:700;letter-spacing:.14em;font-size:15px}
.logo-mark{width:27px;height:27px;display:block;flex-shrink:0}
.logo em{font-style:normal;color:var(--faint);font-family:var(--mono);font-size:10px;letter-spacing:.2em;margin-left:2px}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{color:var(--dim);text-decoration:none;font-size:13.5px;letter-spacing:.04em;transition:color .2s}
.nav-links a:hover{color:var(--gold-hi)}
.btn{
  display:inline-flex;align-items:center;gap:8px;border-radius:8px;cursor:pointer;
  font-family:var(--mono);font-size:13px;letter-spacing:.04em;text-decoration:none;
  padding:12px 20px;transition:transform .18s,box-shadow .18s;white-space:nowrap;
}
.btn-primary{background:var(--gold);color:#171a20;font-weight:700;box-shadow:0 0 26px rgba(201,162,39,.22)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 34px rgba(201,162,39,.32);background:#d9b23a;color:#171a20}
.btn-ghost{border:1px solid var(--line-strong);color:var(--ink);background:var(--panel)}
.btn-ghost:hover{border-color:var(--gold-line);color:var(--gold-hi)}
.btn-sm{padding:9px 16px;font-size:12px}

/* ---------- hero ---------- */
.hero{padding:190px 0 90px;position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(rgba(25,28,36,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(25,28,36,.03) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 30%,transparent 75%);
}
.beam{
  position:absolute;left:0;right:0;height:140px;top:-20%;pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(201,162,39,.10) 50%,transparent);
  animation:sweep 8s linear infinite;
}
@keyframes sweep{0%{top:-18%}100%{top:112%}}
.hexfloat{
  position:absolute;font-family:var(--mono);font-size:11px;color:var(--faint);
  opacity:.5;animation:bob 7s ease-in-out infinite;pointer-events:none;letter-spacing:.06em;
}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative}
.hero-badge{
  display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11.5px;
  letter-spacing:.22em;color:var(--gold-hi);border:1px solid var(--gold-line);
  background:var(--gold-soft);padding:8px 16px;border-radius:999px;margin-bottom:30px;
}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--gold-hi);box-shadow:0 0 10px var(--gold-hi);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
h1{
  font-family:var(--display);font-size:clamp(46px,6.4vw,86px);
  line-height:.98;letter-spacing:-.025em;font-weight:700;
}
h1 .l1{color:var(--dim)}
h1 .l2{color:var(--ink);text-shadow:0 0 42px rgba(201,162,39,.25)}
h1 .accent{color:var(--gold-hi)}
.hero-cn{font-size:19px;color:var(--dim);margin:26px 0 8px;line-height:1.9}
.hero-cn strong{color:var(--ink);font-weight:700}
.hero-cta{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.hero-note{margin-top:22px;font-family:var(--mono);font-size:12px;color:var(--faint);letter-spacing:.05em}
.hero-note b{color:var(--gold-hi);font-weight:500}

/* rubber stamp */
.stamp-wrap{position:relative}
.stamp{
  position:absolute;right:-8px;top:-92px;width:190px;height:190px;
  transform:rotate(-11deg);opacity:.92;pointer-events:none;z-index:3;
  filter:drop-shadow(0 0 20px rgba(197,58,58,.2));
  animation:stampIn .6s cubic-bezier(.2,1.6,.4,1) both .5s;
}
@keyframes stampIn{from{transform:rotate(-11deg) scale(1.9);opacity:0}to{transform:rotate(-11deg) scale(1);opacity:.92}}
.stamp text{fill:var(--red);font-family:var(--mono)}
.stamp .ring-text{font-size:11.5px;letter-spacing:.32em;font-weight:700}
.stamp .big{font-size:34px;font-weight:700;letter-spacing:.08em;font-family:"Doto",var(--mono)}
.stamp .cn{font-size:17px;letter-spacing:.9em;font-family:var(--body);font-weight:900}
.stamp .id{font-size:9px;letter-spacing:.18em}

/* terminal */
.terminal{
  background:var(--well);border:1px solid var(--line-strong);border-radius:14px;
  overflow:hidden;box-shadow:0 30px 80px rgba(25,28,36,.35),0 0 0 1px rgba(255,255,255,.03) inset;
  position:relative;z-index:2;
}
.terminal::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,transparent 0 3px,rgba(255,255,255,.012) 3px 4px);
}
.term-bar{display:flex;align-items:center;gap:8px;padding:13px 18px;border-bottom:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.03)}
.term-bar i{width:11px;height:11px;border-radius:50%;display:block}
.term-bar i:nth-child(1){background:#ff5f57}.term-bar i:nth-child(2){background:#febc2e}.term-bar i:nth-child(3){background:#28c840}
.term-title{font-family:var(--mono);font-size:11.5px;color:#8b8878;margin-left:10px;letter-spacing:.06em}
.term-live{margin-left:auto;font-family:var(--mono);font-size:10px;color:#f0cc6a;letter-spacing:.2em}
.term-body{padding:22px 24px 26px;font-family:var(--mono);font-size:13px;line-height:2.05;min-height:330px;color:var(--dark-ink)}
.term-body .cmd{color:var(--dark-ink)}
.term-body .cmd .prompt{color:#f0cc6a}
.t-ok{color:#8b8878}.t-ok b{color:#45c98c;font-weight:500}
.t-warn{color:#ffc857}
.t-fail{color:#ff5f6d}
.t-verdict{
  margin-top:14px;display:inline-block;border:2px solid #ff5f6d;color:#ff5f6d;
  padding:6px 18px;font-weight:700;letter-spacing:.24em;font-size:13px;border-radius:6px;
  transform:rotate(-2deg);
}
.t-proof{color:#8b8878;font-size:11.5px;letter-spacing:.05em}
.cursor{display:inline-block;width:8px;height:16px;background:#f0cc6a;vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

/* ---------- ticker ---------- */
.ticker{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:var(--bg2);overflow:hidden;white-space:nowrap;position:relative;
}
.ticker-track{display:inline-flex;animation:scroll 36s linear infinite;padding:15px 0}
@keyframes scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.tk{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;padding:0 34px;color:var(--dim)}
.tk .seized{color:var(--red);font-weight:700}
.tk .cleared{color:var(--green);font-weight:700}
.tk::after{content:"✦";color:var(--faint);margin-left:68px}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.stat{background:var(--panel);padding:38px 30px}
.stat .num{font-family:var(--mono);font-size:clamp(28px,3vw,40px);font-weight:700;color:var(--ink);letter-spacing:-.01em;font-feature-settings:"tnum"}
.stat .num span{color:var(--gold-hi)}
.stat .lbl{margin-top:10px;font-size:13px;color:var(--dim);letter-spacing:.04em}
.stat .lbl-en{font-family:var(--mono);font-size:10.5px;color:var(--faint);letter-spacing:.18em;margin-top:5px;text-transform:uppercase}

/* ---------- pipeline ---------- */
.pipe{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:56px;position:relative}
.pipe::before{
  content:"";position:absolute;top:33px;left:6%;right:6%;height:1px;
  background:linear-gradient(90deg,transparent,var(--gold-line) 20%,var(--gold-line) 80%,transparent);
}
.step{position:relative}
.step-num{
  width:66px;height:66px;border-radius:50%;border:1px solid var(--line);
  background:var(--bg2);display:grid;place-items:center;position:relative;z-index:2;
  font-family:var(--mono);font-size:15px;color:var(--gold-hi);margin-bottom:24px;
  box-shadow:0 0 0 8px var(--bg);
}
.step h3{font-family:var(--display);font-size:19px;letter-spacing:.02em;margin-bottom:4px}
.step .cn{font-size:13px;color:var(--gold-hi);font-weight:700;letter-spacing:.3em;margin-bottom:14px}
.step p{color:var(--dim);font-size:13.5px;line-height:1.85}
.step p code{font-family:var(--mono);font-size:12px;color:var(--ink);background:rgba(25,28,36,.05);padding:1px 6px;border-radius:5px}

/* ---------- concepts ---------- */
.concepts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:56px}
.card{
  border:1px solid var(--line);border-radius:14px;padding:32px 28px;background:var(--panel2);
  transition:transform .22s,border-color .22s,box-shadow .22s;position:relative;overflow:hidden;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(201,162,39,.5),transparent);
  opacity:0;transition:opacity .25s;
}
.card:hover{transform:translateY(-5px);border-color:var(--gold-line);box-shadow:0 18px 50px rgba(25,28,36,.12)}
.card:hover::before{opacity:1}
.card .tag{font-family:var(--mono);font-size:10.5px;color:var(--faint);letter-spacing:.22em}
.card h3{font-family:var(--display);font-size:21px;margin:14px 0 2px;letter-spacing:.01em}
.card .cn-name{font-size:13.5px;color:var(--gold-hi);font-weight:700;letter-spacing:.14em;margin-bottom:16px}
.card p{color:var(--dim);font-size:13.5px;line-height:1.9}
.card p b{color:var(--ink);font-weight:500}
.card.wide{grid-column:span 3;display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px}
.card.wide h3{font-size:24px}

/* ---------- vision ---------- */
.vision{text-align:center;padding:150px 0}
.vision .eyebrow{justify-content:center}
.vision .eyebrow::after{content:"";width:34px;height:1px;background:var(--gold-line)}
.vision-en{
  font-family:var(--display);font-weight:700;letter-spacing:-.02em;
  font-size:clamp(30px,4.6vw,58px);line-height:1.14;margin:34px 0 26px;
}
.vision-en .u{color:var(--dim)}.vision-en .l{color:var(--gold-hi)}
.vision-cn{font-size:clamp(17px,2vw,22px);color:var(--dim);letter-spacing:.14em;font-weight:500}
.vision-cn b{color:var(--ink)}
.vision-sub{margin-top:34px;font-family:var(--mono);font-size:13px;color:var(--faint);letter-spacing:.1em}
.vision-sub b{color:var(--gold-hi);font-weight:500}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:64px 0 44px;background:var(--bg2)}
.foot-big{font-family:var(--mono);font-size:clamp(20px,3vw,32px);font-weight:700;letter-spacing:.06em;color:var(--dim)}
.foot-big span{color:var(--red)}
.foot-row{display:flex;justify-content:space-between;align-items:flex-end;margin-top:44px;gap:24px;flex-wrap:wrap}
.foot-links{display:flex;gap:26px}
.foot-links a{color:var(--dim);text-decoration:none;font-family:var(--mono);font-size:12.5px;letter-spacing:.08em}
.foot-links a:hover{color:var(--gold-hi)}
.foot-note{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.06em;line-height:2}
.foot-motto{font-family:var(--mono);font-size:12px;color:var(--gold-hi);letter-spacing:.24em}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .stamp{width:150px;height:150px;top:-70px;right:0}
  .stats{grid-template-columns:1fr 1fr}
  .pipe{grid-template-columns:1fr 1fr;gap:34px}
  .pipe::before{display:none}
  .concepts-grid{grid-template-columns:1fr}
  .card.wide{grid-column:span 1;display:block}
}
@media (max-width:640px){
  .nav-links a:not(.btn){display:none}
  .stats{grid-template-columns:1fr}
  .pipe{grid-template-columns:1fr}
  section{padding:80px 0}
  .hero{padding:140px 0 60px}
}

/* ---------- language toggle (shared) ---------- */
.lang-group{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;margin-left:10px}
.lang-toggle{background:transparent;border:none;color:var(--dim);font-family:var(--mono);font-size:12px;padding:8px 13px;cursor:pointer;letter-spacing:.08em;transition:color .2s,background .2s}
.lang-toggle:hover{color:var(--ink)}
.lang-toggle.active{background:var(--gold-soft);color:var(--gold-hi)}