/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box;}
html{margin:0;padding:0;-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body{margin:0;padding:0;}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;}
table{border-collapse:collapse;width:100%;}

/* ===== 2. Tokens ===== */
:root{
  --felt-900:#08130f;
  --felt-800:#0c1d17;
  --felt-700:#10261e;
  --felt-600:#15332a;
  --felt-500:#1c4136;
  --gold-500:#d8b26a;
  --gold-300:#e8d3a3;
  --gold-100:#f6ecd3;
  --cinnabar:#c8452c;
  --cinnabar-soft:#e06a4e;
  --celadon:#79b0ab;
  --celadon-soft:#a7cec9;
  --paper:#f4efe3;
  --paper-dim:#ded5c3;
  --ink:#14100b;
  --text:#eae4d7;
  --text-muted:#9db1a9;
  --text-dim:#7d8f88;
  --line:rgba(216,178,106,.24);
  --line-soft:rgba(234,228,215,.12);
  --rail-w:250px;
  --header-h:64px;
  --radius:18px;
  --radius-sm:10px;
  --shadow:0 20px 44px -26px rgba(0,0,0,.85);
  --font-sans:"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --max:1180px;
}

/* ===== 3. Chinese typography base ===== */
html{scroll-padding-top:calc(var(--header-h) + 16px);}
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.02em;
  color:var(--text);
  background:
    radial-gradient(90% 50% at 100% 0%, rgba(121,176,171,.10), transparent 62%),
    radial-gradient(70% 40% at 0% 100%, rgba(200,69,44,.12), transparent 60%),
    var(--felt-900);
  background-attachment:fixed;
  padding-top:var(--header-h);
  min-height:100vh;
}
h1,h2,h3,h4{font-weight:800;line-height:1.24;letter-spacing:.08em;color:var(--gold-100);}
h1{font-size:clamp(2rem,6.4vw,3.5rem);letter-spacing:.1em;}
h2{font-size:clamp(1.4rem,3.6vw,2.1rem);}
h3{font-size:clamp(1.1rem,2.4vw,1.35rem);letter-spacing:.06em;}
p{max-width:70ch;}
a{text-decoration:none;}
::selection{background:var(--cinnabar);color:#fff6f1;}
:focus-visible{outline:2px solid var(--celadon);outline-offset:3px;border-radius:4px;}
.mono{font-family:var(--font-mono);font-size:.76em;letter-spacing:.16em;text-transform:uppercase;}
.note-vertical{
  writing-mode:vertical-rl;letter-spacing:.4em;font-size:.7rem;
  color:var(--gold-500);opacity:.6;font-family:var(--font-mono);
}

/* ===== 4. Skip link ===== */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;border-radius:999px;
  background:var(--gold-100);color:var(--ink);
  font-size:.85rem;font-weight:700;letter-spacing:.12em;
  transform:translateY(-160%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0);}

/* ===== 5. Header / brand rail ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  padding:10px 16px;
  background:
    radial-gradient(120% 70% at 0% 0%, rgba(200,69,44,.18), transparent 62%),
    linear-gradient(180deg, var(--felt-700), var(--felt-900) 78%);
  border-bottom:1px solid var(--line);
  box-shadow:0 14px 30px -24px rgba(0,0,0,.9);
}
.rail-head{display:flex;align-items:center;justify-content:space-between;gap:14px;}

.brand{display:flex;align-items:center;gap:12px;min-width:0;}
.brand__mark{
  flex:0 0 auto;display:grid;place-items:center;
  width:40px;height:40px;border-radius:12px;
  background:linear-gradient(150deg, rgba(216,178,106,.26), rgba(200,69,44,.20));
  border:1px solid var(--line);
  color:var(--gold-100);font-weight:800;font-size:1.05rem;letter-spacing:0;
  box-shadow:inset 0 0 0 1px rgba(8,19,15,.5);
}
.brand__text{display:flex;flex-direction:column;min-width:0;}
.brand__name{font-weight:800;font-size:1rem;letter-spacing:.16em;color:var(--gold-100);white-space:nowrap;}
.brand__sub{font-size:.66rem;letter-spacing:.24em;color:var(--text-muted);font-family:var(--font-mono);white-space:nowrap;}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 14px;border-radius:999px;cursor:pointer;
  background:rgba(216,178,106,.08);
  border:1px solid var(--line);
  color:var(--gold-100);font-size:.8rem;font-weight:700;letter-spacing:.18em;
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px;}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:currentColor;transition:transform .24s ease,top .24s ease;
}
.nav-toggle__bars::before{top:1px;}
.nav-toggle__bars::after{top:8px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4.5px;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4.5px;transform:rotate(-45deg);}

.rail-meta{display:none;}
.rail-foot{display:none;}

/* ===== 6. Navigation ===== */
.site-nav{
  position:absolute;left:0;right:0;top:100%;
  padding:10px 14px 20px;
  background:linear-gradient(180deg, rgba(16,38,30,.985), rgba(8,19,15,.995));
  border-bottom:1px solid var(--line);
  box-shadow:var(--shadow);
  visibility:hidden;opacity:0;transform:translateY(-10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
  max-height:calc(100vh - var(--header-h));overflow-y:auto;
}
.site-nav[data-open]{visibility:visible;opacity:1;transform:none;}
.site-nav__list{counter-reset:nav;display:flex;flex-direction:column;gap:4px;}
.site-nav__item{display:block;}
.site-nav__link{
  position:relative;display:flex;align-items:baseline;gap:12px;
  padding:12px 14px;border-radius:12px;
  border:1px solid transparent;
  color:var(--text);font-weight:700;font-size:1rem;letter-spacing:.1em;
  transition:background .24s ease,color .24s ease,border-color .24s ease;
}
.site-nav__link::before{
  counter-increment:nav;content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;
  color:var(--gold-500);opacity:.75;
}
.site-nav__link::after{
  content:"";position:absolute;left:-1px;top:50%;transform:translateY(-50%);
  width:3px;height:0;border-radius:3px;background:var(--cinnabar);
  transition:height .24s ease;
}
.site-nav__link:hover{background:rgba(216,178,106,.1);border-color:var(--line);color:var(--gold-100);}
.site-nav__link[aria-current="page"]{
  background:linear-gradient(90deg, rgba(200,69,44,.26), rgba(216,178,106,.08));
  border-color:rgba(216,178,106,.42);
  color:var(--gold-100);
}
.site-nav__link[aria-current="page"]::before{color:var(--gold-100);opacity:1;}
.site-nav__link[aria-current="page"]::after{height:62%;}

/* ===== 7. Reading progress ===== */
.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  background:rgba(234,228,215,.08);overflow:hidden;
}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--celadon),var(--gold-500) 55%,var(--cinnabar));
  transition:width .12s linear;
}

/* ===== 8. Footer ===== */
.site-footer{
  margin-top:72px;
  background:
    radial-gradient(90% 60% at 100% 0%, rgba(121,176,171,.12), transparent 60%),
    linear-gradient(180deg, var(--felt-800), var(--felt-900));
  border-top:1px solid var(--line);
  color:var(--text);
}
.site-footer__inner{
  max-width:var(--max);
  margin:0 auto;
  padding:56px 20px 34px;
  display:grid;
  gap:32px;
  grid-template-columns:1fr;
}
.foot-brand__mark{
  display:grid;place-items:center;width:44px;height:44px;border-radius:12px;
  background:linear-gradient(150deg, rgba(216,178,106,.24), rgba(200,69,44,.22));
  border:1px solid var(--line);color:var(--gold-100);font-weight:800;font-size:1.05rem;
}
.foot-brand__name{margin-top:14px;font-size:1.05rem;font-weight:800;letter-spacing:.18em;color:var(--gold-100);}
.foot-brand__desc{margin-top:8px;font-size:.86rem;color:var(--text-muted);max-width:34ch;line-height:1.7;}
.foot-brand .note-vertical{margin-top:18px;height:110px;}

.foot-col__title{
  font-size:.74rem;font-family:var(--font-mono);letter-spacing:.26em;
  color:var(--gold-500);margin-bottom:14px;font-weight:600;
}
.foot-list{display:flex;flex-direction:column;gap:10px;}
.foot-list__link,.foot-list__item{
  font-size:.88rem;color:var(--text-muted);letter-spacing:.06em;line-height:1.7;
}
.foot-list__link{display:inline-block;padding:2px 0;border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease;}
.foot-list__link:hover{color:var(--gold-100);border-color:var(--cinnabar);}
.foot-list__item.mono{font-size:.78rem;letter-spacing:.12em;color:var(--celadon-soft);}

.site-footer__legal{
  border-top:1px solid var(--line-soft);
  max-width:var(--max);margin:0 auto;
  padding:20px 20px 34px;
  display:flex;flex-wrap:wrap;gap:8px 26px;
}
.legal-line{font-size:.76rem;letter-spacing:.1em;color:var(--text-dim);max-width:none;}
.legal-line--muted{color:var(--text-muted);}

/* ===== 9. Layout containers ===== */
.shell{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px;}
.section{padding:56px 0;}
.section--tight{padding:32px 0;}
.section--paper{
  background:linear-gradient(180deg, rgba(244,239,227,.97), rgba(222,213,195,.94));
  color:var(--ink);
  border-radius:24px;
  padding:44px 26px;
}
.section--paper h2,.section--paper h3{color:#1d2a24;}
.section--paper p,.section--paper li{color:#3a4640;}
.section__head{display:flex;flex-direction:column;gap:10px;margin-bottom:28px;}
.eyebrow{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.3em;color:var(--gold-500);text-transform:uppercase;}
.title-xl{font-size:clamp(1.7rem,4.6vw,2.6rem);}
.lead{font-size:clamp(.98rem,2vw,1.1rem);color:var(--text-muted);max-width:60ch;line-height:1.85;}
.divider{height:1px;background:var(--line-soft);margin:28px 0;border:0;}

.zone{padding:26px 22px;border-radius:var(--radius);border:1px solid var(--line-soft);}
.zone--felt{background:linear-gradient(160deg, var(--felt-600), var(--felt-800));border-color:var(--line);}
.zone--gold{background:linear-gradient(160deg, rgba(216,178,106,.16), rgba(216,178,106,.05));border-color:var(--line);}
.zone--cinnabar{background:linear-gradient(160deg, rgba(200,69,44,.2), rgba(200,69,44,.06));border-color:rgba(200,69,44,.4);}
.zone--celadon{background:linear-gradient(160deg, rgba(121,176,171,.18), rgba(121,176,171,.05));border-color:rgba(121,176,171,.42);}

.band{
  position:relative;padding:20px 22px 20px 26px;border-radius:14px;
  background:linear-gradient(90deg, rgba(21,51,42,.9), rgba(12,29,23,.7));
  border:1px solid var(--line-soft);
}
.band::before{content:"";position:absolute;left:0;top:12px;bottom:12px;width:4px;border-radius:4px;background:var(--gold-500);}
.band--cinnabar::before{background:var(--cinnabar);}
.band--celadon::before{background:var(--celadon);}
.band--gold::before{background:var(--gold-500);}

.grid{display:grid;gap:20px;grid-template-columns:1fr;}
.grid--2,.grid--3,.grid--split{grid-template-columns:1fr;}
.stack{display:flex;flex-direction:column;gap:18px;}

/* ===== 10. Buttons ===== */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--gold-100);
  --btn-line:var(--line);
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.72em 1.4em;border-radius:999px;
  background:var(--btn-bg);color:var(--btn-fg);border:1px solid var(--btn-line);
  font-size:.88rem;font-weight:700;letter-spacing:.16em;text-decoration:none;cursor:pointer;
  transition:transform .2s ease,filter .2s ease,background .2s ease,border-color .2s ease;
}
.btn--gold{--btn-bg:linear-gradient(180deg,#e6c98c,#c69f56);--btn-fg:#1c1508;--btn-line:transparent;}
.btn--cinnabar{--btn-bg:linear-gradient(180deg,#d9563b,#b23a23);--btn-fg:#fff5f0;--btn-line:transparent;}
.btn--ghost{--btn-bg:rgba(216,178,106,.07);}
.btn--block{width:100%;}
.btn:hover{transform:translateY(-2px);filter:brightness(1.06);}
.btn:active{transform:translateY(0);}

/* ===== 11. Breadcrumbs ===== */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:18px 0 0;font-size:.78rem;letter-spacing:.1em;}
.crumbs__item{color:var(--text-muted);font-family:var(--font-mono);}
.crumbs__item[aria-current="page"]{color:var(--gold-100);}
.crumbs__sep{color:var(--gold-500);opacity:.6;}

/* ===== 12. Cards & tags ===== */
.card{
  position:relative;padding:24px 22px;border-radius:var(--radius);
  background:linear-gradient(165deg, rgba(21,51,42,.92), rgba(10,24,19,.94));
  border:1px solid var(--line-soft);
  transition:border-color .24s ease,transform .24s ease;
}
.card:hover{border-color:var(--line);transform:translateY(-3px);}
.card--gold{border-color:rgba(216,178,106,.4);}
.card--celadon{border-color:rgba(121,176,171,.42);background:linear-gradient(165deg, rgba(23,58,54,.92), rgba(10,26,24,.94));}
.card--cinnabar{border-color:rgba(200,69,44,.45);background:linear-gradient(165deg, rgba(58,26,22,.92), rgba(18,12,10,.94));}
.card--paper{background:linear-gradient(170deg, rgba(244,239,227,.97), rgba(222,213,195,.93));color:var(--ink);border-color:rgba(20,16,11,.12);}
.card--paper .card__title{color:#1d2a24;}
.card--paper .card__body,.card--paper .card__meta{color:#3f4a44;}
.card__label{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.26em;color:var(--gold-500);}
.card__title{margin-top:10px;font-size:1.12rem;font-weight:800;letter-spacing:.06em;color:var(--gold-100);}
.card__body{margin-top:10px;font-size:.9rem;color:var(--text-muted);line-height:1.8;}
.card__meta{margin-top:16px;font-size:.74rem;font-family:var(--font-mono);letter-spacing:.14em;color:var(--text-dim);}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  font-size:.7rem;letter-spacing:.18em;font-family:var(--font-mono);
  border:1px solid var(--line);color:var(--gold-100);background:rgba(216,178,106,.08);
}
.tag--celadon{border-color:rgba(121,176,171,.5);color:var(--celadon-soft);background:rgba(121,176,171,.1);}
.tag--cinnabar{border-color:rgba(200,69,44,.5);color:#f0a08c;background:rgba(200,69,44,.12);}

/* ===== 13. Media placeholders ===== */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius);border:1px solid var(--line-soft);
  background:linear-gradient(140deg, var(--felt-500), var(--felt-900));
}
.media__frame{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;}
.media--wide .media__frame{aspect-ratio:21/9;}
.media--square .media__frame{aspect-ratio:1/1;}
.media--tall .media__frame{aspect-ratio:3/4;}
.media__img{width:100%;height:100%;object-fit:cover;display:block;}
.media__caption{
  padding:10px 16px;font-size:.74rem;letter-spacing:.1em;
  color:var(--text-muted);border-top:1px solid var(--line-soft);font-family:var(--font-mono);
}
.media--celadon{background:linear-gradient(140deg, rgba(121,176,171,.34), var(--felt-800));border-color:rgba(121,176,171,.4);}
.media--cinnabar{background:linear-gradient(140deg, rgba(200,69,44,.34), var(--felt-800));border-color:rgba(200,69,44,.42);}
.media--gold{background:linear-gradient(140deg, rgba(216,178,106,.32), var(--felt-800));border-color:var(--line);}
.media__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(200deg, rgba(255,255,255,.06), transparent 48%);
}

/* ===== 14. Reveal & motion ===== */
html.js [data-reveal]{opacity:0;transform:translateY(18px);}
html.js [data-reveal].is-visible{
  opacity:1;transform:none;
  transition:opacity .62s ease,transform .62s cubic-bezier(.22,.61,.36,1);
}
html{scroll-behavior:smooth;}

/* ===== 15. Tablet ===== */
@media (min-width:600px){
  .site-footer__inner{grid-template-columns:repeat(2,1fr);padding:64px 28px 40px;}
  .section{padding:72px 0;}
  .shell{padding:0 28px;}
  .grid--2{grid-template-columns:repeat(2,1fr);}
}

/* ===== 16. Desktop: left brand rail ===== */
@media (min-width:1024px){
  body{padding-top:0;padding-left:var(--rail-w);}
  html{scroll-padding-top:32px;}

  .site-header{
    inset:0 auto 0 0;
    width:var(--rail-w);
    padding:28px 22px 26px;
    display:flex;flex-direction:column;
    border-bottom:0;border-right:1px solid var(--line);
    background:
      radial-gradient(120% 45% at 0% 0%, rgba(200,69,44,.2), transparent 62%),
      radial-gradient(90% 40% at 100% 100%, rgba(121,176,171,.14), transparent 60%),
      linear-gradient(180deg, var(--felt-700), var(--felt-900) 72%);
    overflow-y:auto;
    box-shadow:none;
  }
  .rail-head{display:block;}
  .brand__mark{width:48px;height:48px;font-size:1.2rem;}
  .brand__name{font-size:1.05rem;}
  .nav-toggle{display:none;}

  .rail-meta{
    display:flex;flex-direction:column;gap:8px;
    margin-top:26px;padding:14px 14px 16px;
    border-radius:14px;
    background:linear-gradient(160deg, rgba(216,178,106,.12), rgba(121,176,171,.06));
    border:1px solid var(--line-soft);
  }
  .rail-meta__chip{font-size:.62rem;letter-spacing:.26em;color:var(--cinnabar-soft);}
  .rail-meta__text{font-size:.8rem;line-height:1.7;color:var(--text-muted);letter-spacing:.06em;}

  .site-nav{
    position:static;
    margin-top:24px;padding:0;
    background:none;border:0;box-shadow:none;
    visibility:visible;opacity:1;transform:none;overflow:visible;
    max-height:none;flex:1 1 auto;
  }
  .site-nav__list{gap:2px;}
  .site-nav__link{padding:11px 13px;font-size:.94rem;letter-spacing:.14em;}

  .rail-foot{display:flex;flex-direction:column;gap:12px;margin-top:26px;}
  .rail-foot__note{font-size:.7rem;letter-spacing:.14em;color:var(--text-dim);line-height:1.8;}

  .scroll-progress{top:0;bottom:0;left:auto;right:0;width:3px;height:auto;}
  .scroll-progress__bar{
    width:100%;height:calc(var(--p,0) * 1%);
    background:linear-gradient(180deg,var(--celadon),var(--gold-500) 55%,var(--cinnabar));
    transition:height .12s linear;
  }

  .site-footer__inner{grid-template-columns:1.3fr .8fr .8fr .8fr 1.1fr;padding:72px 32px 44px;gap:28px;}
  .site-footer__legal{padding:22px 32px 40px;justify-content:space-between;}
  .section{padding:88px 0;}
  .shell{padding:0 32px;}
  .grid--3{grid-template-columns:repeat(3,1fr);}
  .grid--split{grid-template-columns:1.35fr .9fr;gap:28px;}
  .zone{padding:32px 28px;}
}

@media (min-width:1400px){
  :root{--rail-w:272px;}
}

/* ===== 17. Reduced motion ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  html.js [data-reveal]{opacity:1;transform:none;}
  .btn:hover,.card:hover{transform:none;}
  .skip-link{transition:none;}
}