/* ============================================================
   Four Pillars — bilingual editorial layout
   ============================================================ */
:root{
  --paper:#f6f2ea;
  --paper-2:#fbf8f2;
  --ink:#17150f;
  --ink-2:#4a443b;
  --muted:#7a7165;
  --rule:#ddd3c3;
  --rule-soft:#e8e0d2;
  --seal:#9c2b1f;
  --seal-soft:#f1e2dc;
  --bronze:#a8813f;
  --ok:#3f6b4a;
  --maxw:1120px;
  --font-zh:"Songti SC","SimSun","Noto Serif SC","Source Han Serif SC",serif;
  --font-en:"Iowan Old Style","Palatino Linotype","Book Antiqua",Georgia,serif;
  --font-ui:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  color-scheme:light;
}
html[data-theme="dark"]{
  --paper:#111010; --paper-2:#181615; --ink:#efe9dd; --ink-2:#c0b7a9; --muted:#8d8477;
  --rule:#2e2a25; --rule-soft:#241f1c; --seal:#d4644a; --seal-soft:#2b1d19; --bronze:#c69a54;
  --ok:#79a887; color-scheme:dark;
}
@media (prefers-color-scheme: dark){
  html:not([data-theme="light"]){
    --paper:#111010; --paper-2:#181615; --ink:#efe9dd; --ink-2:#c0b7a9; --muted:#8d8477;
    --rule:#2e2a25; --rule-soft:#241f1c; --seal:#d4644a; --seal-soft:#2b1d19; --bronze:#c69a54;
    --ok:#79a887; color-scheme:dark;
  }
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-ui);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(900px 480px at 82% -8%, color-mix(in srgb,var(--seal) 7%, transparent), transparent 70%),
    radial-gradient(700px 420px at 6% 4%, color-mix(in srgb,var(--bronze) 8%, transparent), transparent 70%);
}
main,header,footer{position:relative;z-index:1}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 32px}
::selection{background:var(--seal);color:#fff}
:focus-visible{outline:2px solid var(--seal);outline-offset:3px;border-radius:4px}

/* ---------- type ---------- */
.zh,.en{display:block}
.zh{font-family:var(--font-zh);letter-spacing:.01em}
.en{font-family:var(--font-en);letter-spacing:.005em;color:var(--muted)}
.hero .en,.lead .en{color:var(--ink-2)}
.eyebrow{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--seal);margin:0 0 16px;
}
.eyebrow .en-inline{color:var(--muted)}

/* ---------- bilingual grid ---------- */
.bi{display:grid;grid-template-columns:1fr 1fr;gap:0 56px;position:relative}
.bi::before{
  content:"";position:absolute;left:50%;top:2px;bottom:2px;width:1px;
  background:linear-gradient(to bottom,transparent,var(--rule) 12%,var(--rule) 88%,transparent);
}
.bi > div{min-width:0}
.bi p{margin:0}
.bi .en{font-size:.985rem;line-height:1.72}
html[data-lang="zh"] .bi{grid-template-columns:1fr}
html[data-lang="zh"] .bi::before{display:none}
html[data-lang="zh"] .bi .en{display:none}
html[data-lang="en"] .bi{grid-template-columns:1fr}
html[data-lang="en"] .bi::before{display:none}
html[data-lang="en"] .bi .zh{display:none}
html[data-lang="en"] .bi .en{color:var(--ink)}

/* ---------- top bar / header ---------- */
.topline{height:3px;background:linear-gradient(90deg,var(--seal),var(--bronze) 55%,transparent)}

header.site{
  position:sticky;top:0;z-index:60;border-bottom:1px solid var(--rule);
  background:color-mix(in srgb,var(--paper) 88%, transparent);
  -webkit-backdrop-filter:saturate(160%) blur(12px);backdrop-filter:saturate(160%) blur(12px);
}
.head{display:flex;align-items:center;justify-content:space-between;gap:24px;height:66px}
.brand{display:flex;align-items:center;gap:12px}
.seal{
  width:30px;height:30px;border-radius:5px;background:var(--seal);color:#fff;
  display:grid;place-items:center;font-family:var(--font-zh);font-size:.8rem;line-height:1;
  letter-spacing:-.06em;box-shadow:0 6px 16px -10px var(--seal);
}
.brand-txt{display:flex;flex-direction:column;line-height:1.15}
.brand-txt b{font-family:var(--font-zh);font-size:.98rem;font-weight:600;letter-spacing:.04em}
.brand-txt span{font-family:var(--font-en);font-size:.66rem;letter-spacing:.2em;color:var(--muted);text-transform:uppercase}
.head-right{display:flex;align-items:center;gap:10px}
.slot-chip{
  display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;
  border:1px solid var(--rule);font-size:.78rem;color:var(--ink-2);background:var(--paper-2);
  font-variant-numeric:tabular-nums;
}
.dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb,var(--ok) 18%,transparent)}
.dot.full{background:var(--seal);box-shadow:0 0 0 3px color-mix(in srgb,var(--seal) 18%,transparent)}
.langsw{display:flex;border:1px solid var(--rule);border-radius:9px;overflow:hidden;background:var(--paper-2)}
.langsw button{
  border:0;background:transparent;color:var(--muted);font-size:.76rem;padding:6px 10px;cursor:pointer;
  font-family:var(--font-ui);transition:.18s;
}
.langsw button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.theme-btn{
  width:32px;height:32px;border:1px solid var(--rule);border-radius:9px;background:var(--paper-2);
  color:var(--muted);cursor:pointer;display:grid;place-items:center;font-size:.9rem;
}

/* ---------- hero ---------- */
.hero{padding:clamp(64px,9vw,116px) 0 0}
.hero-h1{
  margin:0 0 26px;font-weight:400;letter-spacing:-.02em;
  font-size:clamp(2.15rem,5.4vw,3.7rem);line-height:1.16;
}
.hero-h1 .zh{font-family:var(--font-zh);font-weight:500}
.hero-h1 .en{font-family:var(--font-en);font-size:.56em;line-height:1.28;margin-top:.42em;letter-spacing:-.01em;color:var(--ink-2)}
.lead{font-size:1.02rem;line-height:1.85;max-width:46rem}
.lead .en{font-size:.97rem;margin-top:.5em}

.stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:clamp(40px,6vw,64px) 0 0;
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);
}
.stat{padding:22px 0;border-right:1px solid var(--rule)}
.stat:last-child{border-right:0}
.stat:not(:first-child){padding-left:28px}
.stat b{display:block;font-family:var(--font-en);font-size:1.55rem;font-weight:400;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.stat span{display:block;font-size:.76rem;color:var(--muted);margin-top:2px;letter-spacing:.04em}

/* ---------- sections ---------- */
section{padding:clamp(56px,8vw,92px) 0;scroll-margin-top:84px}
.sec-head{display:grid;grid-template-columns:88px 1fr;gap:24px;align-items:start;margin-bottom:38px}
.sec-num{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.2em;color:var(--muted);
  padding-top:.5em;border-top:1px solid var(--ink);width:56px;
}
.sec-title{margin:0;font-size:clamp(1.5rem,2.6vw,2rem);font-weight:400;line-height:1.3;letter-spacing:-.01em}
.sec-title .zh{font-family:var(--font-zh);font-weight:600}
.sec-title .en{font-family:var(--font-en);font-size:.62em;margin-top:.35em;color:var(--muted)}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule)}
.card{background:var(--paper);padding:28px 26px 30px}
.card .k{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.18em;color:var(--seal);margin-bottom:14px;display:block}
.card h3{margin:0 0 10px;font-size:1.05rem;font-weight:600;font-family:var(--font-zh);line-height:1.45}
.card h3 .en{font-family:var(--font-en);font-weight:400;font-size:.78em;color:var(--muted);margin-top:3px}
.card p{margin:0;font-size:.9rem;line-height:1.78;color:var(--ink-2)}
.card p + p{margin-top:8px}
.card p.en{font-size:.86rem;color:var(--muted);margin-top:10px;padding-top:10px;border-top:1px dashed var(--rule-soft)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;counter-reset:s}
.step{position:relative;padding-top:18px;border-top:1px solid var(--rule)}
.step::before{
  counter-increment:s;content:"0" counter(s);
  position:absolute;top:-1px;left:0;transform:translateY(-100%);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;color:var(--seal);
  background:var(--paper);padding-right:8px;
}
.step h4{margin:0 0 6px;font-size:.95rem;font-weight:600;font-family:var(--font-zh)}
.step p{margin:0;font-size:.85rem;line-height:1.72;color:var(--ink-2)}
.step p.en{color:var(--muted);font-size:.82rem;margin-top:6px}

/* ---------- quota ---------- */
.quota-wrap{border:1px solid var(--ink);background:var(--paper-2);padding:clamp(28px,4vw,44px);position:relative;overflow:hidden}
.quota-wrap::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,color-mix(in srgb,var(--seal) 10%,transparent),transparent 70%);
}
.quota-top{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:24px;position:relative}
.quota-count{display:flex;align-items:baseline;gap:6px;font-variant-numeric:tabular-nums}
.quota-count b{font-family:var(--font-en);font-size:3.4rem;line-height:1;font-weight:400;letter-spacing:-.03em}
.quota-count i{font-style:normal;font-family:var(--font-en);font-size:1.3rem;color:var(--muted)}
.quota-meta{font-size:.85rem;color:var(--ink-2);text-align:right}
.quota-meta .zh,.quota-meta .en{font-size:.85rem}
.quota-meta .en{color:var(--muted);margin-top:2px}
.pips{display:flex;gap:8px;margin-top:18px}
.pip{width:34px;height:6px;border-radius:3px;background:var(--rule);transition:.3s}
.pip.on{background:var(--seal)}
.pip.used{background:color-mix(in srgb,var(--ink) 25%,transparent)}
.reset-line{margin-top:16px;font-size:.78rem;color:var(--muted);font-family:var(--font-mono);letter-spacing:.06em}

/* ---------- form ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px 24px;margin-top:26px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1 / -1}
.field label{font-size:.8rem;color:var(--ink-2);letter-spacing:.02em}
.field label .en{display:inline;color:var(--muted);font-size:.94em}
.field input,.field select,.field textarea{
  font:inherit;font-size:.95rem;padding:11px 13px;border:1px solid var(--rule);
  border-radius:8px;background:var(--paper);color:var(--ink);transition:border-color .18s,box-shadow .18s;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--ink);box-shadow:0 0 0 3px color-mix(in srgb,var(--ink) 8%,transparent);
}
.field textarea{resize:vertical;min-height:88px}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:.8rem;color:var(--ink-2);line-height:1.6}
.consent input{margin-top:3px;width:16px;height:16px;accent-color:var(--seal)}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:13px 26px;border-radius:9px;
  background:var(--ink);color:var(--paper);border:1px solid var(--ink);
  font-size:.92rem;font-family:var(--font-ui);cursor:pointer;transition:.2s;
}
.btn:hover{background:var(--seal);border-color:var(--seal)}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper)}
.form-note{font-size:.76rem;color:var(--muted);margin-top:14px;line-height:1.7}
.msg{margin-top:18px;padding:14px 16px;border-radius:9px;font-size:.88rem;display:none;line-height:1.65}
.msg.show{display:block}
.msg.ok{background:color-mix(in srgb,var(--ok) 12%,transparent);border:1px solid color-mix(in srgb,var(--ok) 35%,transparent)}
.msg.err{background:color-mix(in srgb,var(--seal) 10%,transparent);border:1px solid color-mix(in srgb,var(--seal) 32%,transparent)}

/* ---------- sample chart ---------- */
.chart-demo{display:flex;gap:14px;justify-content:center;margin:8px 0 0}
.pillar{display:flex;flex-direction:column;gap:8px;align-items:center}
.pillar .lbl{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;color:var(--muted)}
.glyph{
  width:58px;height:58px;display:grid;place-items:center;border:1px solid var(--rule);
  background:var(--paper-2);font-family:var(--font-zh);font-size:1.5rem;color:var(--ink);
}
.glyph.day{border-color:var(--seal);color:var(--seal)}

/* ---------- faq ---------- */
.faq details{border-bottom:1px solid var(--rule);padding:18px 0}
.faq summary{
  cursor:pointer;list-style:none;display:flex;align-items:baseline;gap:14px;
  font-family:var(--font-zh);font-size:1rem;font-weight:600;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";margin-left:auto;color:var(--muted);font-family:var(--font-ui);font-weight:400;font-size:1.1rem}
.faq details[open] summary::after{content:"−"}
.faq .ans{margin:12px 0 0 0;font-size:.9rem;line-height:1.82;color:var(--ink-2);max-width:60rem}
.faq .ans .en{color:var(--muted);margin-top:6px;font-size:.88rem}

/* ---------- principles ---------- */
.principles{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule)}
.pr{background:var(--paper);padding:24px 22px}
.pr b{display:block;font-family:var(--font-zh);font-size:.95rem;margin-bottom:8px}
.pr p{margin:0;font-size:.83rem;line-height:1.7;color:var(--ink-2)}
.pr p.en{color:var(--muted);font-size:.8rem;margin-top:8px}

/* ---------- footer ---------- */
footer.site{border-top:1px solid var(--rule);padding:44px 0 56px;margin-top:20px}
.foot{display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between;align-items:flex-start}
.foot .col{max-width:46rem}
.foot p{margin:0 0 8px;font-size:.78rem;line-height:1.75;color:var(--muted)}
.foot .tagline{font-family:var(--font-zh);font-size:.9rem;color:var(--ink-2);margin-bottom:10px}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .cards{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .principles{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:1px solid var(--rule);padding-left:0 !important}
  .stat:last-child{border-bottom:0}
}
@media (max-width:760px){
  .wrap{padding:0 20px}
  .bi{grid-template-columns:1fr;gap:10px}
  .bi::before{display:none}
  .bi .en{margin-top:2px}
  .form-grid{grid-template-columns:1fr}
  .sec-head{grid-template-columns:1fr;gap:10px}
  .sec-num{width:40px}
  .head{height:60px}
  .brand-txt span{display:none}
  .slot-chip{display:none}
  .quota-meta{text-align:left}
  .steps{grid-template-columns:1fr}
  .principles{grid-template-columns:1fr}
  .chart-demo{gap:8px}
  .glyph{width:48px;height:48px;font-size:1.25rem}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important;scroll-behavior:auto !important}
}

/* ---------- hero cta ---------- */
.hero-cta{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin:34px 0 0}
.cta-note{font-size:.78rem;color:var(--muted);line-height:1.6}
.cta-note .en{font-size:.76rem;color:var(--muted)}