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

/* ========== 2. tokens ========== */
:root{
  --ink-900:#0B2B26;
  --ink-700:#123D35;
  --copper:#B07A2A;
  --copper-ink:#8A5C18;
  --copper-300:#D9B27C;
  --orange:#D95F1F;
  --cream:#F5F0E6;
  --paper:#FBF8F2;
  --black:#1A1F1D;
  --graphite:#46534E;
  --mist:#AFC4BA;
  --line:rgba(11,43,38,.16);
  --line-strong:rgba(11,43,38,.28);
  --font-head:"Roboto Condensed","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius-card:12px;
  --shadow-card:0 18px 32px -30px rgba(11,43,38,.85);
  --shell:1200px;
}

/* ========== 3. base type ========== */
body{
  background:var(--cream);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;color:var(--black);line-height:1.16;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,4.3vw,3.5rem);line-height:1.1}
h2{font-size:clamp(1.6rem,2.7vw,2.2rem);line-height:1.15}
h3{font-size:clamp(1.15rem,1.6vw,1.4rem);line-height:1.25}
h4{font-size:1rem;line-height:1.3;letter-spacing:.01em}
p{max-width:40em}
strong{color:var(--black);font-weight:700}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:4px}
.mono{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.03em;color:var(--graphite)}

/* ========== 4. layout ========== */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.container--narrow{max-width:820px}
.section{padding-block:clamp(2.6rem,6vw,5rem);position:relative}
.section--paper{background:var(--paper);border-block:1px solid var(--line)}
.section--dark{background:var(--ink-900);color:rgba(245,240,230,.84);position:relative;overflow:hidden}
.section--dark::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,rgba(175,196,186,.09) 1px,transparent 1px),linear-gradient(180deg,rgba(175,196,186,.09) 1px,transparent 1px);
  background-size:64px 64px;
}
.section--dark > *{position:relative;z-index:1}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4{color:var(--cream)}
.section--dark .eyebrow,.section--dark .section-index{color:var(--copper-300)}
.section--dark p{color:rgba(245,240,230,.84)}
.section--blueprint{
  background-image:linear-gradient(90deg,rgba(175,196,186,.28) 1px,transparent 1px),linear-gradient(180deg,rgba(175,196,186,.28) 1px,transparent 1px);
  background-size:48px 48px;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper-ink);
}
.section-index{
  display:block;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.2em;
  color:var(--copper-ink);margin-bottom:.6rem;
}
.rule{height:1px;background:var(--line);border:0;margin-block:1.8rem}
.grid{display:grid;gap:clamp(14px,2.2vw,26px)}
.grid--split,.grid--halves,.grid--cards{grid-template-columns:1fr}
@media (min-width:900px){
  .grid--split{grid-template-columns:minmax(0,1.55fr) minmax(0,1fr)}
  .grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:720px){
  .grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
}
.stack > * + *{margin-top:clamp(1rem,2vw,1.5rem)}
.stack--tight > * + *{margin-top:.65rem}

/* ========== 5. card / prose ========== */
.card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:clamp(1.1rem,2.2vw,1.6rem);
  box-shadow:var(--shadow-card);
}
.card--dark{background:var(--ink-700);border-color:rgba(217,178,124,.35);color:rgba(245,240,230,.86)}
.card--dark h3,.card--dark h4{color:var(--cream)}
.prose{max-width:66ch}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(1.4rem,2.2vw,1.85rem);margin-top:2em;padding-top:.6em;border-top:1px solid var(--line)}
.prose h3{margin-top:1.6em}
.prose p{max-width:42em}
.prose a{color:var(--copper-ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--ink-900)}
.prose ul,.prose ol{max-width:42em}
.prose li{position:relative;padding-left:1.35rem;margin-top:.5em}
.prose ul li::before{content:"";position:absolute;left:0;top:.68em;width:.5rem;height:2px;background:var(--copper)}
.prose ol{counter-reset:prose-li}
.prose ol li{counter-increment:prose-li;padding-left:1.8rem}
.prose ol li::before{
  content:counter(prose-li,decimal-leading-zero);
  position:absolute;left:0;top:.1em;font-family:var(--font-mono);font-size:.72rem;color:var(--copper-ink);
}
.prose blockquote{
  border-left:3px solid var(--copper);padding:.4rem 0 .4rem 1rem;
  color:var(--ink-700);font-family:var(--font-head);font-weight:700;font-size:1.05rem;
}
.prose code{font-family:var(--font-mono);font-size:.86em;background:rgba(11,43,38,.07);padding:.1em .35em;border-radius:4px}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:.55rem .6rem;text-align:left;font-size:.92rem}
.prose th{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--copper-ink);text-transform:uppercase}

/* ========== 6. buttons ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.72rem 1.15rem;border-radius:999px;
  font-family:var(--font-head);font-weight:700;font-size:.92rem;letter-spacing:.01em;
  border:1px solid transparent;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--ink-900);color:var(--cream);border-color:var(--ink-900)}
.btn--primary:hover{background:var(--ink-700);border-color:var(--copper)}
.btn--copper{background:var(--copper-ink);color:var(--paper);border-color:var(--copper-ink)}
.btn--copper:hover{background:var(--copper);border-color:var(--copper)}
.btn--ghost{background:transparent;color:var(--ink-900);border-color:var(--line-strong)}
.btn--ghost:hover{background:rgba(11,43,38,.06);border-color:var(--copper)}
.section--dark .btn--ghost{color:var(--cream);border-color:rgba(245,240,230,.42)}
.section--dark .btn--ghost:hover{background:rgba(245,240,230,.1);border-color:var(--copper-300)}
.btn-row{display:flex;flex-wrap:wrap;gap:.7rem}

/* ========== 7. tags / status ========== */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.16rem .55rem;border-radius:4px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  border:1px solid rgba(176,122,42,.55);
  background:rgba(217,178,124,.22);
  color:var(--copper-ink);
}
.tag--warn{background:var(--orange);border-color:var(--orange);color:#1A1F1D;font-weight:700}
.tag--mint{background:rgba(175,196,186,.3);border-color:rgba(11,43,38,.2);color:var(--ink-700)}
.status-dot{
  display:inline-block;width:7px;height:7px;border-radius:50%;
  background:var(--orange);box-shadow:0 0 0 3px rgba(217,95,31,.18);flex:0 0 auto;
}

/* ========== 8. breadcrumb ========== */
.breadcrumb{margin-block:1.1rem 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:var(--graphite)}
.breadcrumb-sep{color:var(--copper);opacity:.8}
.breadcrumb-link{color:var(--graphite);border-bottom:1px solid transparent}
.breadcrumb-link:hover{color:var(--ink-900);border-bottom-color:var(--copper)}
.breadcrumb-current{color:var(--ink-900);font-weight:600}
.section--dark .breadcrumb-list,.section--dark .breadcrumb-link{color:rgba(245,240,230,.7)}
.section--dark .breadcrumb-current{color:var(--cream)}

/* ========== 9. media ========== */
.media{
  position:relative;margin:0;overflow:hidden;
  background:var(--paper);
  background-image:repeating-linear-gradient(135deg,rgba(175,196,186,.22) 0 1px,transparent 1px 12px);
  border:1px solid var(--line-strong);
  border-radius:10px;
  box-shadow:var(--shadow-card);
}
.media::after{
  content:"";position:absolute;inset:6px;border:1px solid rgba(176,122,42,.28);
  border-radius:6px;pointer-events:none;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--panel{aspect-ratio:4/3}
.media-caption{margin-top:.6rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;color:var(--graphite)}
.media-note{margin-top:.35rem;font-size:.82rem;color:var(--graphite)}
.section--dark .media{border-color:rgba(217,178,124,.4);background-color:var(--ink-700)}
.section--dark .media-caption,.section--dark .media-note{color:rgba(245,240,230,.7)}

/* ========== 10. skip link ========== */
.skip-link{
  position:absolute;left:1rem;top:-4rem;z-index:200;
  display:inline-flex;align-items:center;
  padding:.6rem 1rem;border-radius:8px;
  background:var(--ink-900);color:var(--cream);
  border:1px solid var(--copper);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;
  transition:top .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:.75rem}

/* ========== 11. header ========== */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--cream);
  border-bottom:1px solid var(--line);
}
.hdr-rail{
  background:var(--ink-900);color:var(--mist);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  overflow:hidden;max-height:48px;opacity:1;
  transition:max-height .34s ease,opacity .24s ease;
}
.hdr-rail-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.42rem}
.hdr-rail-note{display:flex;align-items:center;gap:.5rem;max-width:none}
.hdr-rail-code{margin:0;color:var(--copper-300);white-space:nowrap;letter-spacing:.14em}
.hdr-shell{padding-inline:clamp(12px,3vw,32px);padding-block:.6rem;transition:padding .3s ease}
.hdr-capsule{
  position:relative;
  display:flex;align-items:center;gap:.6rem;
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:.4rem .45rem .4rem .6rem;
  background:var(--paper);
  border:1px solid var(--line-strong);
  border-radius:999px;
  box-shadow:0 16px 28px -26px rgba(11,43,38,.95);
  transition:box-shadow .3s ease,border-color .3s ease;
}
.site-header.is-scrolled .hdr-rail{max-height:0;opacity:0}
.site-header.is-scrolled .hdr-shell{padding-block:.4rem}
.site-header.is-scrolled .hdr-capsule{border-color:rgba(176,122,42,.55);box-shadow:0 18px 30px -24px rgba(11,43,38,.9)}
.brand{display:inline-flex;align-items:center;gap:.6rem;flex:0 0 auto;padding:.15rem .2rem;border-radius:999px}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:34px;height:34px;border-radius:10px;
  background:var(--ink-900);color:var(--copper-300);
  border:1px solid var(--copper);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-line{font-family:var(--font-head);font-weight:800;font-size:.95rem;color:var(--ink-900);letter-spacing:.02em}
.brand-tag{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;color:var(--copper-ink);margin-top:.12rem}
.nav{display:flex;align-items:center;gap:.15rem;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:.15rem}
.nav-link{
  display:inline-flex;align-items:center;
  padding:.5rem .7rem;border-radius:999px;
  font-family:var(--font-head);font-weight:700;font-size:.86rem;color:var(--ink-900);
  white-space:nowrap;
  transition:background .2s ease,color .2s ease,box-shadow .2s ease;
}
.nav-link:hover{background:rgba(11,43,38,.07)}
.nav-link[aria-current="page"]{
  background:rgba(176,122,42,.16);color:var(--ink-900);
  box-shadow:inset 0 0 0 1px rgba(176,122,42,.6);
}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;gap:.4rem;
  margin-left:.5rem;padding:.5rem .95rem;border-radius:999px;
  background:var(--ink-900);color:var(--cream);
  border:1px solid var(--ink-900);
  font-family:var(--font-head);font-weight:700;font-size:.86rem;white-space:nowrap;
  transition:background .2s ease,border-color .2s ease,color .2s ease;
}
.nav-cta:hover{background:var(--ink-700);border-color:var(--copper-300)}
.nav-toggle{
  display:none;align-items:center;gap:.5rem;margin-left:auto;
  padding:.45rem .7rem;border-radius:999px;
  border:1px solid var(--line-strong);background:rgba(245,240,230,.72);
  color:var(--ink-900);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;
}
.nav-toggle-bars{display:inline-grid;gap:3px;width:14px}
.nav-toggle-bars span{display:block;height:2px;background:currentColor;border-radius:2px;transition:transform .25s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.hdr-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(11,43,38,.1);pointer-events:none}
.hdr-progress-fill{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--copper),var(--orange))}

/* ========== 12. footer ========== */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--ink-900);
  color:rgba(245,240,230,.78);
  padding-block:clamp(2.4rem,5vw,3.8rem) 1.2rem;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,rgba(175,196,186,.08) 1px,transparent 1px),linear-gradient(180deg,rgba(175,196,186,.08) 1px,transparent 1px);
  background-size:64px 64px;
}
.ftr-inner{position:relative;z-index:1}
.ftr-top{
  display:grid;grid-template-columns:1fr;gap:clamp(1.6rem,3vw,2.6rem);
  padding-bottom:clamp(1.4rem,3vw,2rem);
  border-bottom:1px solid rgba(217,178,124,.3);
}
@media (min-width:820px){
  .ftr-top{grid-template-columns:minmax(0,1.05fr) minmax(0,1.35fr) minmax(0,1fr)}
}
.ftr-brand{display:grid;grid-template-columns:auto 1fr;gap:.5rem .75rem;align-content:start}
.ftr-stamp{
  grid-row:span 2;
  display:grid;place-items:center;
  width:44px;height:44px;border-radius:10px;
  background:rgba(217,178,124,.12);
  border:1px solid var(--copper-300);
  color:var(--copper-300);
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;
}
.ftr-brand-name{font-family:var(--font-head);font-weight:800;font-size:1.05rem;color:var(--cream);align-self:end}
.ftr-brand-tag{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;color:var(--copper-300);align-self:start}
.ftr-summary{grid-column:1 / -1;margin-top:.6rem;font-size:.9rem;line-height:1.7;max-width:26em;color:rgba(245,240,230,.76)}
.ftr-groups{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1.4rem}
.ftr-col-title{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper-300);padding-bottom:.55rem;border-bottom:1px solid rgba(217,178,124,.28);margin-bottom:.7rem;
}
.ftr-list{display:grid;gap:.42rem}
.ftr-link{
  display:inline-block;font-size:.92rem;color:rgba(245,240,230,.8);
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .2s ease,border-color .2s ease;
}
.ftr-link:hover,.ftr-link:focus-visible{color:var(--copper-300);border-bottom-color:var(--copper-300)}
.ftr-contact{border-left:0;padding-left:0}
@media (min-width:820px){.ftr-contact{border-left:1px solid rgba(217,178,124,.24);padding-left:clamp(1rem,2vw,1.6rem)}}
.ftr-contact-title{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper-300);margin-bottom:.7rem;
}
.ftr-contact-line{
  display:grid;grid-template-columns:auto 1fr;gap:.6rem;
  font-size:.88rem;line-height:1.6;margin-bottom:.45rem;color:rgba(245,240,230,.85);
  word-break:break-word;max-width:none;
}
.ftr-contact-key{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;
  color:var(--copper-300);padding-top:.2em;white-space:nowrap;
}
.ftr-contact-note{font-size:.78rem;line-height:1.6;color:rgba(245,240,230,.6);margin-top:.6rem;max-width:24em}
.ftr-contact-link{
  display:inline-flex;align-items:center;gap:.35rem;margin-top:.85rem;
  padding:.42rem .85rem;border-radius:999px;
  border:1px solid rgba(217,178,124,.5);color:var(--copper-300);
  font-family:var(--font-head);font-weight:700;font-size:.82rem;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.ftr-contact-link:hover{background:rgba(217,178,124,.14);border-color:var(--copper-300);color:var(--cream)}
.ftr-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.6rem 1.2rem;
  margin-top:1.2rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:rgba(245,240,230,.6);
}
.ftr-filing{max-width:none}
.ftr-copy{max-width:none}
.ftr-legal-list{display:flex;flex-wrap:wrap;gap:.4rem 1rem}
.ftr-legal-list .ftr-link{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:rgba(245,240,230,.62)}

/* ========== 13. motion / reveal ========== */
[data-reveal]{transition:opacity .56s ease-out,transform .56s ease-out;transition-delay:calc(var(--reveal-i,0) * 70ms)}
.js-reveal [data-reveal]{opacity:0;transform:translateY(16px)}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ========== 14. responsive ========== */
@media (max-width:920px){
  .nav-toggle{display:inline-flex}
  .hdr-rail-code{display:none}
  .hdr-rail-inner{justify-content:flex-start}
  .hdr-capsule{border-radius:22px;padding:.45rem .5rem .45rem .55rem}
  .nav{
    position:absolute;top:calc(100% + .5rem);left:0;right:0;z-index:95;
    display:none;flex-direction:column;align-items:stretch;gap:.2rem;margin:0;
    padding:.55rem;
    background:var(--paper);border:1px solid var(--line-strong);border-radius:20px;
    box-shadow:0 30px 44px -32px rgba(11,43,38,.95);
  }
  .nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:.1rem}
  .nav-link{justify-content:space-between;padding:.72rem .85rem;border-radius:12px;font-size:.95rem}
  .nav-link[aria-current="page"]::after{
    content:"当前";font-family:var(--font-mono);font-size:.6rem;letter-spacing:.14em;color:var(--copper-ink);
  }
  .nav-cta{margin:.35rem 0 0;padding:.72rem .9rem;border-radius:14px;justify-content:center}
}
@media (max-width:520px){
  .brand-tag{display:none}
  .brand-line{font-size:.9rem}
  .brand-mark{width:30px;height:30px;font-size:.66rem}
  .nav-toggle-label{display:none}
  .ftr-legal{flex-direction:column;align-items:flex-start}
}
@media (min-width:921px){
  .nav[data-open]{display:flex}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-reveal],.js-reveal [data-reveal]{opacity:1 !important;transform:none !important;transition:none !important}
  .btn:hover{transform:none}
}