/* ==========================================================================
   鼎选 DINGSEL — 品牌网站样式表
   Palette : 宣纸 / 玄墨 / 描金 / 朱砂
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  --paper:#F6F0E4;
  --paper-2:#EFE6D6;
  --paper-3:#E7DCC7;
  --ink:#161311;
  --ink-2:#3B342B;
  --ink-3:#7C7267;
  --ink-4:#A79C8D;
  --gold:#C08A4A;
  --gold-2:#D9A45B;
  --gold-3:#EBD5A8;
  --crimson:#C8392B;
  --dark:#161311;
  --dark-2:#211C16;
  --dark-3:#2C251D;
  --line:rgba(22,19,17,.13);
  --line-2:rgba(22,19,17,.07);
  --line-gold:rgba(192,138,74,.35);
  --line-light:rgba(246,240,228,.14);

  --font-sans:"Inter","Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"SimSun","Microsoft YaHei",serif;

  --maxw:1220px;
  --gut:40px;
  --r-s:4px;
  --r-m:10px;
  --r-l:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-s:0 1px 2px rgba(22,19,17,.05),0 8px 24px -12px rgba(22,19,17,.16);
  --shadow-m:0 2px 4px rgba(22,19,17,.05),0 24px 60px -28px rgba(22,19,17,.28);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-sans);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(22,19,17,.026) 1px,transparent 1px),
    linear-gradient(90deg,rgba(22,19,17,.026) 1px,transparent 1px);
  background-size:68px 68px;
  mask-image:radial-gradient(ellipse at 50% 0%,#000 20%,transparent 85%);
}
img,svg{max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul{margin:0;padding:0;list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
::selection{background:var(--crimson);color:var(--paper)}

/* ---------- 3. Layout ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gut);position:relative;z-index:2}
.section{padding:118px 0;position:relative;border-top:1px solid var(--line-2)}
.section--tight{padding:84px 0}
.section--paper2{background:var(--paper-2)}
.section--dark{background:var(--dark);color:var(--paper);border-top-color:rgba(246,240,228,.08)}
.section--dark .lead,.section--dark p{color:#C7BDAF}
.grid{display:grid;gap:26px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g-7-5{grid-template-columns:7fr 5fr}
.g-5-7{grid-template-columns:5fr 7fr}

/* ---------- 4. Typography ---------- */
.eyebrow{
  font-size:11.5px;letter-spacing:.42em;text-transform:uppercase;
  color:var(--gold);font-weight:600;display:inline-flex;align-items:center;gap:12px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);opacity:.7}
.sec-no{
  font-family:var(--font-serif);font-size:13px;letter-spacing:.3em;color:var(--crimson);
  font-weight:700;display:block;margin-bottom:20px;
}
h1{font-family:var(--font-serif);font-weight:900;line-height:1.12;letter-spacing:.01em}
h2{
  font-family:var(--font-serif);font-weight:900;font-size:clamp(28px,3.4vw,46px);
  line-height:1.22;letter-spacing:.01em;margin:16px 0 20px;
}
h3{font-size:19px;font-weight:700;letter-spacing:.02em;margin-bottom:10px}
h4{font-size:15px;font-weight:700;letter-spacing:.04em}
.lead{font-size:17px;line-height:1.85;color:var(--ink-2);max-width:74ch}
.lead b{color:var(--ink);font-weight:700}
.small{font-size:13.5px;color:var(--ink-3)}
.mono{font-family:ui-monospace,"SF Mono",Consolas,monospace;font-size:12.5px;letter-spacing:.02em}
.gold{color:var(--gold)}
.crimson{color:var(--crimson)}
.nowrap{white-space:nowrap}

/* ---------- 5. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;height:50px;padding:0 28px;
  border-radius:999px;border:1px solid transparent;font-size:14px;font-weight:600;
  letter-spacing:.06em;cursor:pointer;transition:.35s var(--ease);white-space:nowrap;
}
.btn svg{width:16px;height:16px;flex:none}
.btn--primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--primary:hover{background:var(--crimson);border-color:var(--crimson);transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(200,57,43,.7)}
.btn--gold{background:linear-gradient(100deg,var(--gold),var(--gold-2));color:#1B1610;font-weight:700}
.btn--gold:hover{transform:translateY(-2px);box-shadow:0 16px 34px -16px rgba(192,138,74,.85)}
.btn--ghost{border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink);background:rgba(22,19,17,.04)}
.section--dark .btn--ghost{border-color:var(--line-light);color:var(--paper)}
.section--dark .btn--ghost:hover{background:rgba(246,240,228,.08);border-color:var(--gold)}
.btn--sm{height:42px;padding:0 20px;font-size:13px}

/* ---------- 6. Header ---------- */
.topbar{
  background:var(--ink);color:#B9AE9E;font-size:12px;letter-spacing:.14em;
  border-bottom:1px solid rgba(246,240,228,.08);position:relative;z-index:60;
}
.topbar .wrap{display:flex;align-items:center;gap:14px;height:38px;justify-content:space-between}
.topbar b{color:var(--gold-3);font-weight:600}
.topbar .sep{width:1px;height:12px;background:rgba(246,240,228,.25)}
.topbar .tb-right{display:flex;align-items:center;gap:12px}

.header{
  position:sticky;top:0;z-index:70;background:rgba(246,240,228,.88);
  backdrop-filter:blur(16px) saturate(1.4);border-bottom:1px solid var(--line-2);
  transition:border-color .3s,box-shadow .3s;
}
.header.is-stuck{border-bottom-color:var(--line);box-shadow:0 10px 30px -24px rgba(22,19,17,.5)}
.header .wrap{display:flex;align-items:center;height:78px;gap:30px}
.brand{display:flex;align-items:center;gap:13px;flex:none}
.brand-mark{width:38px;height:38px;flex:none;transition:transform .5s var(--ease)}
.brand:hover .brand-mark{transform:rotate(-8deg)}
.brand-txt{display:flex;flex-direction:column;line-height:1}
.brand-txt b{font-family:var(--font-serif);font-size:20px;font-weight:900;letter-spacing:.16em}
.brand-txt i{font-style:normal;font-size:9.5px;letter-spacing:.34em;color:var(--gold);font-weight:700;margin-top:4px}
.nav{margin-left:auto;display:flex;align-items:center;gap:30px;font-size:14px;letter-spacing:.05em}
.nav a{position:relative;color:var(--ink-2);padding:4px 0;transition:color .25s}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--gold);transition:width .35s var(--ease)}
.nav a:hover{color:var(--ink)}
.nav a:hover::after{width:100%}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:50%;background:none;align-items:center;justify-content:center;cursor:pointer}
.burger span{display:block;width:16px;height:1.5px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--ink);transition:.3s}
.burger span::before{top:-5px}.burger span::after{top:5px}
.m-nav{display:none}

/* ---------- 7. Hero ---------- */
.hero{
  position:relative;overflow:hidden;background:var(--paper);
  padding:96px 0 0;border-bottom:1px solid var(--line-2);
}
.hero::before{
  content:"";position:absolute;width:900px;height:900px;right:-260px;top:-340px;border-radius:50%;
  background:radial-gradient(circle,rgba(217,164,91,.30),transparent 62%);pointer-events:none;
}
.hero::after{
  content:"";position:absolute;width:620px;height:620px;left:-220px;bottom:-300px;border-radius:50%;
  background:radial-gradient(circle,rgba(200,57,43,.13),transparent 65%);pointer-events:none;
}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center;padding-bottom:84px}
.hero-lock{display:block;width:min(520px,100%);height:auto;margin:26px 0 0}
.hero h1{font-size:clamp(34px,4.6vw,60px);margin-top:22px}
.hero h1 em{font-style:normal;color:var(--crimson)}
.hero .lead{margin-top:26px;font-size:16.5px}
.hero-cta{display:flex;gap:14px;margin-top:38px;flex-wrap:wrap}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px}
.tag{
  border:1px solid var(--line);border-radius:999px;padding:8px 18px;font-size:12.5px;
  letter-spacing:.1em;color:var(--ink-2);background:rgba(255,255,255,.4);
}
.hero-art{position:relative;display:flex;align-items:center;justify-content:center;min-height:400px}
.hero-seal{width:min(400px,100%);height:auto;filter:drop-shadow(0 30px 60px rgba(22,19,17,.22));position:relative;z-index:2}
.ring{position:absolute;border:1px solid var(--line-gold);border-radius:50%;animation:spin 46s linear infinite}
.ring--1{width:92%;aspect-ratio:1}
.ring--2{width:74%;aspect-ratio:1;border-style:dashed;animation-duration:70s;animation-direction:reverse}
.ring--3{width:112%;aspect-ratio:1;border-color:var(--line-2);animation-duration:96s}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-strip{border-top:1px solid var(--line-2);background:linear-gradient(var(--paper-2),var(--paper))}
.hero-strip .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:0;padding-top:0;padding-bottom:0}
.hero-strip .cell{padding:30px 26px;border-left:1px solid var(--line-2);display:flex;gap:14px;align-items:flex-start}
.hero-strip .cell:first-child{border-left:0;padding-left:0}
.hero-strip svg{width:22px;height:22px;color:var(--gold);flex:none;margin-top:4px}
.hero-strip b{display:block;font-size:15px;margin-bottom:2px}
.hero-strip span{font-size:13px;color:var(--ink-3);line-height:1.6;display:block}

/* ---------- 8. Marquee ---------- */
.marquee{background:var(--dark);color:var(--paper);padding:18px 0;overflow:hidden;border-top:1px solid rgba(246,240,228,.1);border-bottom:1px solid rgba(246,240,228,.1)}
.marquee-track{display:flex;gap:0;width:max-content;animation:slide 42s linear infinite}
.marquee-track span{
  font-family:var(--font-serif);font-size:14px;letter-spacing:.34em;color:rgba(246,240,228,.72);
  padding:0 26px;display:inline-flex;align-items:center;gap:26px;white-space:nowrap;
}
.marquee-track span::after{content:"◆";font-size:7px;color:var(--gold)}
@keyframes slide{to{transform:translateX(-50%)}}

/* ---------- 9. Cards ---------- */
.card{
  background:#FBF7EE;border:1px solid var(--line-2);border-radius:var(--r-l);
  padding:34px 32px;transition:.4s var(--ease);position:relative;overflow:hidden;
}
.card::after{content:"";position:absolute;left:0;top:0;width:100%;height:2px;background:linear-gradient(90deg,var(--gold),transparent);opacity:0;transition:.4s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-m);border-color:var(--line-gold)}
.card:hover::after{opacity:1}
.card h3{margin-bottom:12px}
.card p{font-size:14.5px;color:var(--ink-3);line-height:1.8}
.card--dark{background:var(--dark-2);border-color:rgba(246,240,228,.1);color:var(--paper)}
.card--dark p{color:#B6AC9D}
.card--dark h3{color:var(--paper)}
.card-idx{font-family:var(--font-serif);font-size:12px;letter-spacing:.3em;color:var(--gold);display:block;margin-bottom:16px}
.card-icon{width:30px;height:30px;color:var(--crimson);margin-bottom:18px}
.card--dark .card-icon{color:var(--gold-2)}

/* ---------- 10. Definition block ---------- */
.def{display:grid;grid-template-columns:auto 1fr;gap:30px;align-items:start;padding:34px 0;border-bottom:1px solid var(--line-2)}
.def:last-child{border-bottom:0}
.def-glyph{
  font-family:var(--font-serif);font-size:64px;font-weight:900;line-height:1;color:var(--ink);
  width:104px;height:104px;flex:none;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line-gold);border-radius:var(--r-m);background:rgba(217,164,91,.08);
}
.def:nth-child(2) .def-glyph{color:var(--crimson)}
.def p{font-size:15px;color:var(--ink-2);max-width:70ch}
.def .h{font-size:20px;font-family:var(--font-serif);font-weight:900;margin-bottom:8px}

/* ---------- 11. Brand architecture ---------- */
.arch{border:1px solid var(--line);border-radius:var(--r-l);overflow:hidden;background:#FBF7EE}
.arch-row{display:grid;grid-template-columns:210px 1fr;border-bottom:1px solid var(--line-2)}
.arch-row:last-child{border-bottom:0}
.arch-key{padding:24px 28px;background:rgba(22,19,17,.03);font-size:13px;letter-spacing:.16em;color:var(--ink-3);display:flex;align-items:center}
.arch-val{padding:24px 30px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.arch-val .cn{font-family:var(--font-serif);font-size:30px;font-weight:900;letter-spacing:.06em}
.arch-val .en{font-size:20px;font-weight:800;letter-spacing:.28em;color:var(--gold)}
.arch-val .sub{font-size:13px;color:var(--ink-3);letter-spacing:.1em}
.arch-val .slg{font-family:var(--font-serif);font-size:26px;font-weight:900;letter-spacing:.14em;color:var(--crimson)}

/* ---------- 12. Loop diagram ---------- */
.loop{display:grid;grid-template-columns:1fr auto 1fr;gap:0;align-items:stretch;margin-top:20px}
.loop-side{padding:44px 38px;border:1px solid var(--line);background:#FBF7EE}
.loop-side:first-child{border-radius:var(--r-l) 0 0 var(--r-l);border-right:0}
.loop-side:last-child{border-radius:0 var(--r-l) var(--r-l) 0;border-left:0;background:var(--dark);color:var(--paper);border-color:rgba(246,240,228,.12)}
.loop-side h3{font-family:var(--font-serif);font-size:24px;font-weight:900;margin-bottom:6px}
.loop-side .who{font-size:12px;letter-spacing:.24em;color:var(--gold);margin-bottom:22px;display:block}
.loop-side li{display:flex;gap:12px;padding:11px 0;font-size:14.5px;border-bottom:1px dashed var(--line-2);align-items:flex-start}
.loop-side:last-child li{border-bottom-color:rgba(246,240,228,.12);color:#C7BDAF}
.loop-side li:last-child{border-bottom:0}
.loop-side li::before{content:"—";color:var(--gold);flex:none}
.loop-hub{
  width:150px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  background:linear-gradient(180deg,var(--paper-2),var(--paper-3));border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  position:relative;
}
.loop-hub .ring2{width:92px;height:92px;border:1px dashed var(--line-gold);border-radius:50%;display:flex;align-items:center;justify-content:center;animation:spin 30s linear infinite}
.loop-hub .ring2 svg{width:34px;height:34px;color:var(--crimson);animation:spin 30s linear infinite reverse}
.loop-hub b{font-family:var(--font-serif);font-size:15px;letter-spacing:.3em;writing-mode:vertical-rl}
.loop-hub em{font-style:normal;font-size:10px;letter-spacing:.3em;color:var(--ink-3);writing-mode:vertical-rl}

/* ---------- 13. Responsibility table ---------- */
.resp{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--r-l);overflow:hidden;background:#FBF7EE}
.resp-col{padding:40px 36px}
.resp-col+.resp-col{border-left:1px solid var(--line-2)}
.resp-col h3{display:flex;align-items:center;gap:12px;font-family:var(--font-serif);font-size:21px;font-weight:900;margin-bottom:6px}
.resp-col h3 svg{width:24px;height:24px;color:var(--crimson)}
.resp-col .who{font-size:12px;letter-spacing:.16em;color:var(--ink-3);margin-bottom:26px;display:block}
.resp-item{display:flex;gap:14px;padding:15px 0;border-top:1px solid var(--line-2);align-items:flex-start}
.resp-item b{font-size:15px;font-weight:600;display:block}
.resp-item span{font-size:13px;color:var(--ink-3);line-height:1.65;display:block;margin-top:3px}
.tick{width:18px;height:18px;border-radius:50%;background:rgba(200,57,43,.1);color:var(--crimson);display:flex;align-items:center;justify-content:center;font-size:10px;flex:none;margin-top:5px;font-weight:700}
.resp-note{
  margin-top:28px;padding:20px 24px;border-left:3px solid var(--gold);background:rgba(217,164,91,.1);
  font-size:14px;color:var(--ink-2);border-radius:0 var(--r-m) var(--r-m) 0;
}

/* ---------- 14. Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line-light);border-radius:var(--r-l);overflow:hidden}
.stat{padding:38px 30px;border-left:1px solid var(--line-light)}
.stat:first-child{border-left:0}
.stat .num{font-family:var(--font-serif);font-size:clamp(34px,4vw,52px);font-weight:900;line-height:1;color:var(--gold-2);display:flex;align-items:baseline;gap:4px}
.stat .num i{font-style:normal;font-size:16px;letter-spacing:.1em;color:#9A8F80}
.stat .lbl{font-size:13.5px;letter-spacing:.14em;color:#B6AC9D;margin-top:14px}
.stat .sub{font-size:12px;color:#7E7565;margin-top:6px}

/* ---------- 15. Timeline ---------- */
.tl{position:relative;margin-top:16px}
.tl::before{content:"";position:absolute;left:0;right:0;top:41px;height:1px;background:var(--line)}
.tl-items{display:grid;grid-template-columns:repeat(5,1fr);gap:24px}
.tl-item{position:relative;padding-top:74px}
.tl-item::before{
  content:"";position:absolute;top:33px;left:0;width:17px;height:17px;border-radius:50%;
  background:var(--paper);border:1px solid var(--gold);
}
.tl-item::after{content:"";position:absolute;top:41px;left:6px;width:5px;height:5px;border-radius:50%;background:var(--crimson);transition:.4s}
.tl-item:hover::before{border-color:var(--crimson)}
.tl-item:hover::after{transform:scale(1.6)}
.tl-item b{display:block;font-size:12px;letter-spacing:.3em;color:var(--gold);margin-bottom:10px}
.tl-item h4{margin-bottom:8px}
.tl-item p{font-size:13.5px;color:var(--ink-3);line-height:1.7}

/* ---------- 16. Spec preview (colors / logo) ---------- */
.swatches{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.sw{border:1px solid var(--line-2);border-radius:var(--r-m);overflow:hidden;background:#FBF7EE}
.sw .chip{height:104px}
.sw .meta{padding:14px 16px;border-top:1px solid var(--line-2)}
.sw .nm{font-size:13.5px;font-weight:700}
.sw .hx{font-family:ui-monospace,Consolas,monospace;font-size:11.5px;color:var(--ink-3);margin-top:4px;letter-spacing:.04em}
.logo-demo{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.logo-stage{
  border:1px solid var(--line-2);border-radius:var(--r-m);min-height:172px;
  display:flex;align-items:center;justify-content:center;padding:26px;background:#FBF7EE;position:relative;
}
.logo-stage.dark{background:var(--dark);border-color:rgba(246,240,228,.12)}
.logo-stage.gold{background:linear-gradient(120deg,var(--gold),var(--gold-2))}
.logo-stage .badge-no{
  position:absolute;top:10px;left:10px;font-size:10px;font-weight:700;letter-spacing:.1em;
  background:rgba(200,57,43,.12);color:var(--crimson);padding:3px 9px;border-radius:999px;
}
.cap{font-size:12.5px;color:var(--ink-3);letter-spacing:.06em;margin-top:10px}
.cap b{color:var(--ink-2)}

/* ---------- 17. CTA / form ---------- */
.cta{background:var(--dark);color:var(--paper);position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;width:760px;height:760px;right:-200px;bottom:-420px;border-radius:50%;background:radial-gradient(circle,rgba(217,164,91,.24),transparent 62%)}
.form{background:rgba(246,240,228,.04);border:1px solid rgba(246,240,228,.14);border-radius:var(--r-l);padding:38px 36px}
.field{margin-bottom:18px}
.field label{display:block;font-size:12px;letter-spacing:.18em;color:#A79C8D;margin-bottom:8px}
.field input,.field select,.field textarea{
  width:100%;background:rgba(22,19,17,.4);border:1px solid rgba(246,240,228,.16);border-radius:var(--r-s);
  padding:13px 15px;font-size:14.5px;color:var(--paper);transition:.25s;outline:none;
}
.field textarea{min-height:96px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--gold);background:rgba(22,19,17,.62)}
.field input::placeholder,.field textarea::placeholder{color:rgba(199,189,175,.45)}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:12.5px;color:#8B8172;margin-top:14px;line-height:1.7}
.contact-list{margin-top:34px;display:grid;gap:2px}
.contact-item{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid rgba(246,240,228,.1);align-items:center}
.contact-item svg{width:20px;height:20px;color:var(--gold);flex:none}
.contact-item b{font-size:14.5px;display:block}
.contact-item span{font-size:12.5px;color:#8B8172;letter-spacing:.06em;display:block}
a.contact-item{cursor:pointer;transition:border-color .3s}
a.contact-item:hover{border-bottom-color:var(--gold)}
a.contact-item:hover b{color:var(--gold-2)}

/* 运营方信息块（优字节 U-BYTES）—— 默认用于深底区块（CTA / 页脚） */
.operator{display:flex;align-items:center;gap:13px;margin-top:26px}
.operator img{border-radius:7px;flex:none;background:rgba(246,240,228,.1);padding:2px}
.operator b{display:block;font-size:13.5px;letter-spacing:.04em;color:var(--paper)}
.operator span{display:block;font-size:12px;line-height:1.7;color:#9B9082;letter-spacing:.04em;margin-top:3px}
.operator a{color:var(--gold-2);border-bottom:1px solid var(--line-gold)}
.operator a:hover{color:var(--crimson)}
.footer .operator{margin-top:20px}

/* ---------- 18. Footer ---------- */
.footer{background:var(--ink);color:#9C9284;font-size:13.5px;padding:76px 0 34px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px;border-bottom:1px solid rgba(246,240,228,.1)}
.footer h5{color:var(--paper);font-size:13px;letter-spacing:.24em;font-weight:700;margin:0 0 18px}
.footer a:hover{color:var(--gold-2)}
.footer li{margin-bottom:11px;font-size:13.5px}
.footer .brand-txt b{color:var(--paper)}
.footer .about{margin-top:18px;line-height:1.85;font-size:13.5px;max-width:38ch;color:#8B8172}
.footer .legal{display:flex;justify-content:space-between;gap:20px;padding-top:26px;font-size:12.5px;color:#7E7565;flex-wrap:wrap}
.footer .legal span{letter-spacing:.06em}
.footer-seal{width:64px;opacity:.9;margin-top:22px}

/* ---------- 19. Reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}
.reveal.d5{transition-delay:.4s}

/* ---------- 20. Page hero (inner pages) ---------- */
.phero{padding:82px 0 62px;border-bottom:1px solid var(--line-2);position:relative;overflow:hidden;background:var(--paper-2)}
.phero::before{content:"";position:absolute;width:700px;height:700px;right:-240px;top:-380px;border-radius:50%;background:radial-gradient(circle,rgba(217,164,91,.26),transparent 62%)}
.phero h1{font-size:clamp(30px,4vw,50px);margin:18px 0 0}
.phero .lead{margin-top:22px}
.crumb{font-size:12.5px;letter-spacing:.16em;color:var(--ink-3)}
.crumb a:hover{color:var(--gold)}

/* ---------- 21. Utilities ---------- */
.mw-60{max-width:60ch}.mw-70{max-width:70ch}
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}
.mt-32{margin-top:32px}.mt-48{margin-top:48px}.mt-64{margin-top:64px}
.center{text-align:center}
.hr-gold{height:1px;background:linear-gradient(90deg,var(--gold),transparent);border:0;margin:0}
.divider-seal{display:flex;align-items:center;gap:18px;color:var(--gold);font-size:12px;letter-spacing:.3em}
.divider-seal::before,.divider-seal::after{content:"";height:1px;background:var(--line-gold);flex:1}

/* ---------- 22. Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,140%);z-index:200;
  background:var(--ink);color:var(--paper);padding:14px 26px;border-radius:999px;font-size:14px;
  box-shadow:var(--shadow-m);transition:transform .5s var(--ease);display:flex;gap:10px;align-items:center;
}
.toast.show{transform:translate(-50%,0)}
.toast svg{width:16px;height:16px;color:var(--gold-2)}

/* ---------- 22b. VI 规范页 ---------- */
.vi-nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:26px}
.vi-nav a{
  font-size:12.5px;letter-spacing:.12em;padding:9px 18px;border:1px solid var(--line);
  border-radius:999px;color:var(--ink-2);transition:.3s;
}
.vi-nav a:hover{border-color:var(--gold);color:var(--ink);background:rgba(217,164,91,.1)}

.clearspace{position:relative;display:inline-block;padding:58px;background:#FBF7EE;border-radius:var(--r-m)}
.clearspace .box{position:absolute;inset:0;border:1px dashed var(--gold);border-radius:var(--r-m);opacity:.8}
.clearspace .u{position:absolute;left:50%;top:0;bottom:0;width:1px;background:repeating-linear-gradient(var(--ink-4) 0 5px,transparent 5px 10px);opacity:.5}
.clearspace .h{position:absolute;top:50%;left:0;right:0;height:1px;background:repeating-linear-gradient(90deg,var(--ink-4) 0 5px,transparent 5px 10px);opacity:.5}
.clearspace .x{position:absolute;font-size:11px;font-weight:700;color:var(--paper);background:var(--gold);padding:2px 8px;border-radius:999px;letter-spacing:.1em}

.mis{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.mis .m{border:1px solid var(--line-2);border-radius:var(--r-m);overflow:hidden;background:#FBF7EE}
.mis .vis{height:132px;display:flex;align-items:center;justify-content:center;background:var(--paper-2);position:relative}
.mis .txt{padding:12px 16px;font-size:12.5px;color:var(--ink-2);border-top:1px solid var(--line-2)}
.badge-no{position:absolute;top:9px;left:9px;font-size:10px;font-weight:700;letter-spacing:.08em;padding:3px 9px;border-radius:999px}
.badge-no.no{background:rgba(200,57,43,.13);color:var(--crimson)}
.badge-no.warn{background:rgba(192,138,74,.16);color:#8A6231}

.type-spec{border:1px solid var(--line-2);border-radius:var(--r-m);padding:26px 28px;background:#FBF7EE;margin-bottom:14px}
.type-spec .demo{font-family:var(--font-serif);font-weight:900;line-height:1.2;margin-bottom:10px}
.type-spec .note{font-size:12.5px;color:var(--ink-3);letter-spacing:.04em}
.type-spec .note b{color:var(--ink-2)}

.mockups{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.mock{border:1px solid var(--line-2);border-radius:var(--r-m);min-height:230px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;background:var(--paper-2);padding:26px}
.mock .cap-in{position:absolute;left:14px;bottom:12px;font-size:11.5px;letter-spacing:.14em;color:var(--ink-3)}
.mock-card{width:100%;max-width:260px;aspect-ratio:1.75;background:var(--paper);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow-s);padding:18px;display:flex;flex-direction:column;justify-content:space-between}
.mock-badge{width:120px;height:160px;background:var(--dark);border-radius:8px;color:var(--paper);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;box-shadow:var(--shadow-s)}
.mock-bag{width:150px;height:180px;background:linear-gradient(160deg,#E9DFCB,#F6F0E4);border:1px solid var(--line);border-radius:4px 4px 10px 10px;display:flex;align-items:center;justify-content:center}
.mock-sign{width:100%;background:var(--ink);border-radius:8px;padding:22px 20px;text-align:center;color:var(--paper)}
.mock-pack{width:140px;height:170px;background:var(--paper);border:1px solid var(--line);border-radius:6px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;box-shadow:var(--shadow-s)}
.mock-social{display:flex;gap:14px}
.mock-social .av{width:74px;height:74px;border-radius:50%;background:var(--dark);display:flex;align-items:center;justify-content:center}
.mock-social .bn{width:150px;height:74px;border-radius:8px;background:linear-gradient(120deg,var(--gold),var(--gold-2));display:flex;align-items:center;justify-content:center}

.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:20px}
.tabs [data-tab]{
  font-size:13px;letter-spacing:.1em;padding:10px 20px;border:1px solid var(--line);
  background:none;border-radius:999px;cursor:pointer;transition:.3s;color:var(--ink-3);
}
.tabs [data-tab]:hover{border-color:var(--gold);color:var(--ink)}
.tabs [data-tab].is-on{background:var(--ink);color:var(--paper);border-color:var(--ink)}

.file-table{width:100%;border-collapse:collapse;font-size:14px}
.file-table th,.file-table td{text-align:left;padding:15px 14px;border-bottom:1px solid var(--line-2)}
.file-table th{font-size:11.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3);font-weight:700}
.file-table td.f{font-family:ui-monospace,Consolas,monospace;font-size:12.5px;color:var(--gold)}
.file-table tr:hover td{background:rgba(217,164,91,.06)}
.swatch-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.ok-list li{display:flex;gap:12px;padding:10px 0;font-size:14.5px;color:var(--ink-2);border-bottom:1px solid var(--line-2)}
.ok-list li::before{content:"✓";color:var(--crimson);font-weight:700}
.no-list li::before{content:"✕"}

/* ---------- 23. Responsive ---------- */
@media (max-width:1080px){
  .g4,.stats,.tl-items{grid-template-columns:repeat(2,1fr)}
  .swatches{grid-template-columns:repeat(3,1fr)}
  .mis,.mockups{grid-template-columns:repeat(2,1fr)}
  .tl::before{display:none}
  .tl-items{gap:30px}
  .tl-item{padding-top:34px}
  .tl-item::before,.tl-item::after{display:none}
}
@media (max-width:960px){
  :root{--gut:22px}
  .hero .wrap{grid-template-columns:1fr;gap:44px}
  .hero-art{min-height:300px;order:-1}
  .g2,.g3,.g-7-5,.g-5-7,.resp,.logo-demo{grid-template-columns:1fr}
  .resp-col+.resp-col{border-left:0;border-top:1px solid var(--line-2)}
  .loop{grid-template-columns:1fr}
  .loop-side:first-child{border-radius:var(--r-l) var(--r-l) 0 0;border-right:1px solid var(--line);border-bottom:0}
  .loop-side:last-child{border-radius:0 0 var(--r-l) var(--r-l);border-left:1px solid rgba(246,240,228,.12);border-top:0}
  .loop-hub{width:100%;height:96px;flex-direction:row;border:1px solid var(--line);border-top:0;border-bottom:0}
  .loop-hub b,.loop-hub em{writing-mode:horizontal-tb}
  .arch-row{grid-template-columns:1fr}
  .arch-key{padding:16px 22px 0;background:none}
  .arch-val{padding:6px 22px 22px}
  .hero-strip .wrap{grid-template-columns:1fr 1fr}
  .hero-strip .cell{border-left:0;border-top:1px solid var(--line-2);padding:22px 0}
  .hero-strip .cell:nth-child(even){padding-left:22px;border-left:1px solid var(--line-2)}
  .footer .cols{grid-template-columns:1fr 1fr}
  .nav{display:none}
  .burger{display:flex}
  .m-nav{
    display:block;position:fixed;inset:0 0 auto;top:0;z-index:65;background:var(--paper);
    padding:120px var(--gut) 44px;transform:translateY(-102%);transition:transform .55s var(--ease);
    box-shadow:var(--shadow-m);
  }
  .m-nav.open{transform:none}
  .m-nav a{display:block;font-family:var(--font-serif);font-size:26px;font-weight:900;padding:14px 0;border-bottom:1px solid var(--line-2);letter-spacing:.06em}
  .m-nav .btn{margin-top:26px}
  .section{padding:78px 0}
  .def{grid-template-columns:1fr;gap:18px}
  .def-glyph{width:74px;height:74px;font-size:44px}
}
@media (max-width:640px){
  .g4,.stats,.swatches,.form .row2,.hero-strip .wrap,.mis,.mockups{grid-template-columns:1fr}
  .hero-strip .cell:nth-child(even){padding-left:0;border-left:0}
  .stat{border-left:0;border-top:1px solid var(--line-light)}
  .footer .cols{grid-template-columns:1fr}
  .hero{padding-top:64px}
  .topbar .tb-right{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .header,.topbar,.marquee,.toast{display:none}
  body::before{display:none}
  .section{padding:40px 0;page-break-inside:avoid}
  body{background:#fff}
}