/* ===== 01 reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,dl,dd,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
table{border-collapse:collapse;width:100%}
summary{list-style:none}
summary::-webkit-details-marker{display:none}
[id]{scroll-margin-top:104px}

/* ===== 02 tokens ===== */
:root{
  --ink-900:#0A0D11;
  --ink-750:#12171E;
  --paper-100:#F3EFE7;
  --gold-500:#C8A24A;
  --gold-200:#E8D6A8;
  --cyan-400:#35E0D2;
  --amber-500:#F2A03C;
  --mist-cyan:#7E9AA1;
  --teal-deep:#0E3A38;
  --wine-700:#5A1F2C;
  --indigo-800:#241F4A;
  --pass-green:#3E9E6A;
  --text-main:#E9E6DF;
  --text-soft:#CFCBC2;
  --line-gold:rgba(200,162,74,.34);
  --line-soft:rgba(255,255,255,.07);
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --wrap-max:1320px;
  --edge:72px;
  --wrap-small:64px;
  --shadow-hard:8px 8px 0 rgba(0,0,0,.55);
  --shadow-gold:4px 4px 0 rgba(200,162,74,.22);
  --t-fast:160ms ease;
  --t-mid:220ms ease;
}

/* ===== 03 base typography ===== */
body{
  background:var(--ink-900);
  color:var(--text-main);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.28;
  letter-spacing:.08em;
  color:#F2EDE3;
}
h1{font-size:clamp(28px,4vw,48px)}
h2{font-size:clamp(22px,3vw,34px)}
h3{font-size:clamp(18px,2.2vw,26px)}
h4{font-size:20px}
p{max-width:36em}
strong{color:var(--gold-200);font-weight:600}
::selection{background:var(--cyan-400);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--cyan-400);outline-offset:2px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  padding:10px 18px;background:var(--cyan-400);color:var(--ink-900);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  border:2px solid var(--ink-900);transition:top var(--t-fast);
}
.skip-link:focus{top:12px}

/* ===== 04 layout ===== */
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--edge)}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}
.prose{max-width:36em}
.prose p+p{margin-top:1.1em}
.prose ul,.prose ol{margin-top:1em;display:grid;gap:.6em}
.prose li{padding-left:26px;position:relative;color:var(--text-soft)}
.prose li::before{content:"§";position:absolute;left:0;top:0;font-family:var(--font-mono);font-size:12px;color:var(--gold-500)}

/* ===== 05 small type & marks ===== */
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  color:var(--mist-cyan);text-transform:uppercase;
}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--line-gold);
  background:rgba(200,162,74,.08);color:var(--gold-200);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;white-space:nowrap;
}
.chip b{color:var(--cyan-400);font-weight:600}
.chip--gold{border-color:rgba(200,162,74,.55)}
.chip--cyan{border-color:rgba(53,224,210,.5);background:rgba(53,224,210,.08);color:var(--cyan-400)}
.tag{
  display:inline-block;padding:2px 8px;
  border:1px solid rgba(242,160,60,.6);color:var(--amber-500);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;white-space:nowrap;
}
.rule{height:2px;background:var(--line-gold);border:0;margin-block:32px}
.dot{display:inline-block;width:8px;height:8px;background:var(--mist-cyan);border-radius:50%;flex:none}
.dot--pass{background:var(--pass-green);box-shadow:0 0 0 3px rgba(62,158,106,.18)}

/* ===== 06 buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:2px solid var(--gold-500);
  background:var(--gold-500);color:var(--ink-900);
  font-family:var(--font-display);font-size:14px;font-weight:600;letter-spacing:.06em;
  box-shadow:4px 4px 0 rgba(53,224,210,.18);
  transition:transform var(--t-fast),box-shadow var(--t-fast),background-color var(--t-fast),border-color var(--t-fast),color var(--t-fast);
  cursor:pointer;
}
.btn:hover{background:var(--gold-200);border-color:var(--gold-200);transform:translate(-1px,-1px);box-shadow:6px 6px 0 rgba(53,224,210,.26)}
.btn--ghost{background:transparent;color:var(--gold-200);border-color:rgba(200,162,74,.6);box-shadow:none}
.btn--ghost:hover{background:rgba(200,162,74,.12);color:var(--cyan-400);border-color:var(--cyan-400);transform:none;box-shadow:none}
.btn--quiet{background:transparent;color:var(--cyan-400);border-color:transparent;box-shadow:none;padding-inline:0}
.btn--quiet:hover{color:var(--gold-200);background:transparent;transform:none;box-shadow:none}

/* ===== 07 breadcrumb ===== */
.breadcrumb{padding-block:22px 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist-cyan)}
.breadcrumb-link{color:var(--mist-cyan);border-bottom:1px solid transparent;transition:color var(--t-fast),border-color var(--t-fast)}
.breadcrumb-link:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-400)}
.breadcrumb-sep{color:rgba(126,154,161,.45)}
.breadcrumb-current{color:var(--gold-200)}

/* ===== 08 chapter & manual blocks ===== */
.band{height:6px;background:var(--gold-500)}
.band--teal{background:var(--teal-deep)}
.band--wine{background:var(--wine-700)}
.band--indigo{background:var(--indigo-800)}
.chapter-head{
  display:grid;grid-template-columns:clamp(44px,7vw,64px) minmax(0,1fr);
  gap:clamp(16px,2.4vw,28px);align-items:start;margin-bottom:28px;
}
.chapter-num{
  font-family:var(--font-mono);font-size:clamp(26px,4.4vw,64px);line-height:1;
  color:var(--gold-500);letter-spacing:.02em;
}
.chapter-title{font-family:var(--font-display);font-size:clamp(21px,2.8vw,34px);letter-spacing:.08em;color:#F2EDE3}
.chapter-kicker{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--mist-cyan);max-width:60ch}
.chapter-body{color:var(--text-soft)}

.media-frame{
  position:relative;border:2px solid var(--gold-500);background:var(--ink-750);
  box-shadow:var(--shadow-hard);overflow:hidden;
}
.media-frame img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover}
.media-frame--tall img{aspect-ratio:4/5}
.media-cap{
  padding:10px 14px;border-top:1px solid var(--line-gold);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist-cyan);
}
.media-tag{
  position:absolute;top:0;left:0;z-index:2;
  padding:4px 10px;background:var(--ink-900);
  border-right:2px solid var(--gold-500);border-bottom:2px solid var(--gold-500);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan-400);
}

.sheet-wrap{overflow-x:auto;border:2px solid var(--line-gold);background:var(--ink-750)}
.sheet{width:100%;min-width:520px;font-size:14px}
.sheet th{
  padding:11px 14px;text-align:left;white-space:nowrap;
  font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.12em;
  color:var(--mist-cyan);background:var(--ink-900);
  border-bottom:1px dashed rgba(126,154,161,.5);
}
.sheet td{padding:12px 14px;color:var(--text-soft);border-bottom:1px solid var(--line-soft)}
.sheet tbody tr:nth-child(even){background:rgba(18,23,30,.9)}
.sheet tbody tr:hover{color:var(--gold-200)}

.fold{border-top:2px solid var(--line-gold);background:var(--ink-750);margin-bottom:12px}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 18px;cursor:pointer;font-size:16px;color:var(--text-main);
  transition:color var(--t-fast),background-color var(--t-fast);
}
.fold summary:hover{color:var(--gold-200);background:rgba(200,162,74,.06)}
.fold summary::after{content:"+";font-family:var(--font-mono);font-size:16px;color:var(--cyan-400);flex:none}
.fold[open] summary::after{content:"−"}
.fold-body{padding:0 18px 20px;font-size:15px;color:var(--text-soft);max-width:44em}

/* ===== 09 header ===== */
.site-header{position:sticky;top:0;z-index:80;background:var(--ink-900)}
.header-rail{
  overflow:hidden;max-height:56px;
  background:var(--ink-750);border-bottom:1px solid rgba(200,162,74,.26);
  transition:max-height var(--t-mid),opacity var(--t-mid);
}
.site-header[data-scrolled] .header-rail{max-height:0;opacity:0}
.rail-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:36px;padding-block:8px}
.rail-brand{display:flex;align-items:center;gap:10px;flex-wrap:wrap;max-width:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist-cyan)}
.rail-mark{color:var(--gold-200)}
.rail-sep{color:rgba(126,154,161,.45)}
.rail-desc{color:var(--mist-cyan)}
.rail-meta{display:flex;align-items:center;gap:14px;max-width:none}
.rail-hint{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:rgba(126,154,161,.8);white-space:nowrap}

.header-bar{
  position:sticky;top:0;z-index:90;
  background:rgba(10,13,17,.97);
  border-bottom:1px solid var(--line-gold);
  transition:box-shadow var(--t-mid),background-color var(--t-mid);
}
.site-header[data-scrolled] .header-bar{box-shadow:0 8px 0 rgba(0,0,0,.45)}
.bar-inner{display:flex;align-items:center;gap:24px;min-height:68px;padding-block:10px}

.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand-glyph{
  display:grid;place-items:center;width:46px;height:38px;
  border:2px solid var(--gold-500);box-shadow:var(--shadow-gold);
  font-size:13px;color:var(--gold-200);
  transition:border-color var(--t-fast),color var(--t-fast),box-shadow var(--t-fast);
}
.brand:hover .brand-glyph{border-color:var(--cyan-400);color:var(--cyan-400);box-shadow:4px 4px 0 rgba(53,224,210,.25)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-family:var(--font-display);font-size:18px;font-weight:600;letter-spacing:.16em;color:#F2EDE3}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--mist-cyan)}

.nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-link{
  position:relative;display:flex;align-items:baseline;gap:6px;
  padding:10px 12px;font-size:13px;letter-spacing:.02em;color:#DCD7CC;
  transition:color var(--t-fast);
}
.nav-link::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:2px;height:18px;background:var(--gold-500);
  transition:width var(--t-fast),background-color var(--t-fast);
}
.nav-link:hover{color:var(--gold-200)}
.nav-link:hover::before{width:6px;background:var(--cyan-400)}
.nav-link[aria-current="page"]{color:var(--cyan-400)}
.nav-link[aria-current="page"]::before{width:6px;background:var(--cyan-400)}
.nav-idx{font-size:11px;color:var(--mist-cyan);transition:color var(--t-fast)}
.nav-link:hover .nav-idx,.nav-link[aria-current="page"] .nav-idx{color:var(--gold-200)}
.header-cta{flex:none;padding:9px 16px;font-size:13px}

.nav-toggle{
  display:none;flex:none;align-items:center;justify-content:center;
  width:46px;height:40px;border:2px solid rgba(200,162,74,.55);
  color:var(--gold-200);cursor:pointer;
  transition:border-color var(--t-fast),color var(--t-fast);
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.nav-toggle-bars{display:block;width:18px;height:2px;background:currentColor;box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor}
.site-header[data-open] .nav-toggle{border-color:var(--cyan-400);color:var(--cyan-400)}

.scroll-meter{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(200,162,74,.14);pointer-events:none}
.scroll-meter-fill{display:block;height:100%;width:0;background:var(--cyan-400);transition:width 90ms linear}

/* ===== 10 footer ===== */
.site-footer{background:var(--ink-900);color:var(--text-soft);border-top:1px solid rgba(200,162,74,.28);margin-top:96px}
.footer-band{height:6px;background:linear-gradient(90deg,var(--gold-500) 0 16%,var(--teal-deep) 16% 48%,var(--indigo-800) 48% 76%,var(--wine-700) 76% 100%)}
.footer-top{display:grid;grid-template-columns:minmax(240px,4fr) 8fr;gap:56px;padding-block:60px 44px}
.footer-wordmark{font-family:var(--font-display);font-size:clamp(28px,3.4vw,40px);font-weight:600;letter-spacing:.14em;color:#F2EDE3;max-width:none}
.footer-sub{margin-top:10px;font-size:14px;color:var(--mist-cyan);max-width:24em}
.footer-stamp{margin-top:18px;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--gold-500);max-width:none}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.footer-col-title{
  padding-bottom:10px;border-bottom:1px dashed rgba(126,154,161,.45);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--gold-200);max-width:none;
}
.footer-list{margin-top:14px;display:grid;gap:10px}
.footer-link{
  position:relative;display:inline-block;padding-left:12px;
  font-size:14px;color:var(--text-soft);
  transition:color var(--t-fast);
}
.footer-link::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:2px;
  background:rgba(200,162,74,.5);
  transition:width var(--t-fast),background-color var(--t-fast);
}
.footer-link:hover{color:var(--gold-200)}
.footer-link:hover::before{width:5px;background:var(--cyan-400)}
.footer-link[aria-current="page"]{color:var(--cyan-400)}
.footer-link[aria-current="page"]::before{width:5px;background:var(--cyan-400)}

.footer-contact{border-top:1px solid var(--line-soft);padding-block:34px}
.contact-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.contact-item{min-width:0}
.contact-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--mist-cyan);max-width:none}
.contact-value{margin-top:6px;font-family:var(--font-mono);font-size:15px;letter-spacing:.04em;color:#EDE8DD;word-break:break-all;max-width:none}
.contact-value--text{font-family:var(--font-body);font-size:15px;letter-spacing:.02em}
.contact-note{margin-top:24px;font-size:13px;line-height:1.85;color:rgba(126,154,161,.95);max-width:64ch}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding-block:18px 30px;border-top:1px solid var(--line-soft);
  font-size:12px;color:rgba(126,154,161,.92);
}
.legal-text{max-width:none}
.legal-meta{font-family:var(--font-mono);letter-spacing:.08em;color:var(--gold-500);max-width:none}

/* ===== 11 responsive ===== */
@media (max-width:1240px){
  :root{--edge:40px}
  .rail-hint{display:none}
}
@media (max-width:1120px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;margin-left:0;
    padding:14px var(--edge) 22px;
    background:var(--ink-750);
    border-bottom:2px solid var(--gold-500);
    max-height:calc(100vh - 72px);overflow-y:auto;
  }
  .site-header[data-open] .nav{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{padding:14px 12px;font-size:15px;border-bottom:1px solid var(--line-soft)}
  .nav-link::before{height:22px}
  .bar-inner{gap:14px}
  .header-cta{margin-left:auto;padding:8px 12px;font-size:12px;letter-spacing:.02em}
  .brand-glyph{width:42px;height:36px}
  .footer-top{grid-template-columns:1fr;gap:40px;padding-block:48px 36px}
}
@media (max-width:900px){
  .contact-grid{grid-template-columns:1fr;gap:18px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .col-3,.col-4,.col-6,.col-8,.col-9{grid-column:span 12}
}
@media (max-width:760px){
  :root{--edge:20px}
  body{font-size:16px}
  .rail-brand{font-size:10px;letter-spacing:.06em;gap:6px}
  .rail-desc{display:none}
  .bar-inner{min-height:60px;gap:10px}
  .brand-name{font-size:16px;letter-spacing:.12em}
  .brand-sub{display:none}
  .header-cta{padding:7px 10px;font-size:11px}
  .nav-toggle{width:42px;height:38px}
  .site-footer{margin-top:72px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .chapter-head{grid-template-columns:1fr;gap:8px}
  .chapter-num{font-size:26px}
  .rule{margin-block:24px}
}

/* ===== 12 motion preferences ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .btn:hover,.btn--ghost:hover{transform:none}
  .site-header[data-scrolled] .header-bar{box-shadow:none}
}