/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:8.5rem}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,picture{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ===== 2. Tokens ===== */
:root{
  --ink:#16233A;
  --ink-deep:#0E1828;
  --ink-soft:#1E2E4A;
  --brown:#241C19;
  --accent:#E2762F;
  --accent-soft:#F0894A;
  --paper:#F6F1E6;
  --paper-soft:#EFE8D9;
  --divider:#C7D0CE;
  --gold:#B08A4A;
  --gold-deep:#8A6529;
  --brick:#B5442F;
  --green:#3F6B5B;
  --green-soft:#7FB39E;
  --text-on-ink:#EDE6D8;
  --text-muted-on-ink:#9FAEC4;
  --text-on-paper:#241C19;
  --text-muted-on-paper:#5A636E;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-pill:999px;
  --shadow-paper:0 18px 34px -24px rgba(0,0,0,.72), inset 0 1px 0 rgba(255,255,255,.4);
  --shell:1180px;
  --font-display:"Oswald","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Serif SC","Noto Serif SC","Songti SC",SimSun,"Microsoft YaHei",serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Cascadia Mono",Menlo,Consolas,monospace;
}

/* ===== 3. Base ===== */
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  font-size:clamp(15px,.5vw + 13.8px,17px);
  line-height:1.85;
  color:var(--text-on-ink);
  background-color:var(--ink);
  background-image:
    linear-gradient(180deg,rgba(255,255,255,.04),rgba(0,0,0,.18)),
    repeating-linear-gradient(90deg,rgba(199,208,206,.055) 0 1px,transparent 1px 104px);
  background-attachment:fixed;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:700;line-height:1.16;letter-spacing:.01em}
p{text-wrap:pretty}
.mono{font-family:var(--font-mono);font-weight:500;font-variant-numeric:tabular-nums;letter-spacing:.02em}
.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}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.skip-link{
  position:absolute;left:14px;top:-120px;z-index:90;
  padding:10px 18px;border-radius:var(--radius-pill);
  background:var(--accent);color:#12203A;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;
  transition:top .16s ease;
}
.skip-link:focus{top:14px}
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 clamp(16px,4vw,40px)}

/* ===== 4. Typography helpers ===== */
.display-1{font-size:clamp(2.05rem,5.2vw,3.5rem);line-height:1.04;letter-spacing:-.015em}
.display-2{font-size:clamp(1.55rem,3.2vw,2.3rem);line-height:1.12}
.display-3{font-size:clamp(1.15rem,1.7vw,1.42rem)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::before{content:"";width:20px;height:1px;background:currentColor;display:block}
.lede{font-size:clamp(1rem,1.2vw,1.14rem);line-height:1.92;max-width:54ch;color:#D6D0C2}
.prose{max-width:66ch}
.prose p{margin-bottom:1.15em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.5em 0 .55em;color:#FFF7E8}
.prose a{color:var(--accent);border-bottom:1px solid rgba(226,118,47,.5)}
.prose a:hover{color:var(--accent-soft)}
.prose ul{display:grid;gap:.5em;margin-bottom:1.2em;padding-left:1.1em;list-style:none}
.prose li{position:relative}
.prose li::before{content:"";position:absolute;left:-1.05em;top:.85em;width:6px;height:6px;border-radius:50%;background:var(--gold)}
.prose strong{color:#FFF7E8;font-weight:700}

/* ===== 5. Layout bands / grid ===== */
.section{padding:clamp(38px,6.5vw,84px) 0}
.section--tight{padding:clamp(22px,3.6vw,42px) 0}
.band{border-radius:clamp(16px,2.4vw,28px);padding:clamp(24px,4vw,46px) clamp(18px,3.4vw,44px)}
.band--paper{background:var(--paper);color:var(--text-on-paper);box-shadow:var(--shadow-paper)}
.band--deep{background:var(--ink-deep);border:1px solid rgba(199,208,206,.16)}
.band--paper .eyebrow{color:var(--gold-deep)}
.band--paper .lede{color:#4C5560}
.band--paper .prose h2,.band--paper .prose h3,.band--paper .prose strong{color:var(--brown)}
.grid{display:grid;gap:clamp(16px,2.2vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--sidebar{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr)}

/* ===== 6. Buttons & pills ===== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border-radius:var(--radius-pill);
  border:1px solid transparent;font-size:.92rem;font-weight:600;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--solid{background:var(--accent);color:#12203A}
.btn--solid:hover{background:var(--accent-soft)}
.btn--ghost{border-color:rgba(199,208,206,.42);color:var(--text-on-ink)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn--paper{background:var(--paper);color:var(--ink)}
.band--paper .btn--ghost{border-color:rgba(36,28,25,.28);color:var(--brown)}
.band--paper .btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border-radius:var(--radius-pill);
  border:1px solid transparent;font-size:.86rem;white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.pill--solid{background:var(--accent);color:#12203A;font-weight:700}
.pill--solid:hover{background:var(--accent-soft)}
.pill--ghost{border-color:rgba(199,208,206,.4);color:var(--text-on-ink)}
.pill--ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ===== 7. Breadcrumb ===== */
.crumbs{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--text-muted-on-ink)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--gold);opacity:.75}
.crumbs a:hover{color:var(--accent)}
.crumbs [aria-current="page"]{color:var(--paper)}
.band--paper .crumbs{color:var(--text-muted-on-paper)}

/* ===== 8. Cards / tags ===== */
.card{
  position:relative;
  background:var(--paper);color:var(--text-on-paper);
  border-radius:var(--radius-lg);
  border:1px solid rgba(36,28,25,.08);
  box-shadow:var(--shadow-paper);
  padding:clamp(18px,2.4vw,26px);
}
.card--ink{
  background:var(--ink-soft);color:var(--text-on-ink);
  border-color:rgba(199,208,206,.18);box-shadow:none;
}
.card-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:10px}
.card-title{font-size:1.05rem;line-height:1.36}
.card-meta{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--text-muted-on-paper)}
.card--ink .card-meta{color:var(--text-muted-on-ink)}
.card p{font-size:.94rem;color:#3E464F}
.card--ink p{color:#C6CFDC}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:var(--radius-pill);
  border:1px solid currentColor;
  font-family:var(--font-mono);font-size:.67rem;letter-spacing:.1em;text-transform:uppercase;
}
.tag--gold{color:var(--gold)}
.tag--green{color:var(--green-soft)}
.tag--brick{color:#E08C74}
.band--paper .tag--green,.card .tag--green{color:var(--green)}
.band--paper .tag--brick,.card .tag--brick{color:var(--brick)}
.band--paper .tag--gold,.card .tag--gold{color:var(--gold-deep)}

/* ===== 9. Index list ===== */
.index-list{display:grid;gap:0}
.index-item{
  display:grid;
  grid-template-columns:5.6rem 3.8rem minmax(0,1fr) auto;
  gap:clamp(10px,1.6vw,22px);
  align-items:baseline;
  padding:14px 6px;
  border-bottom:1px solid rgba(199,208,206,.22);
  transition:background-color .18s ease;
}
.index-item:hover{background:rgba(199,208,206,.07)}
.index-date{font-family:var(--font-mono);font-size:.76rem;font-weight:500;color:var(--accent);letter-spacing:.04em}
.index-num{font-family:var(--font-mono);font-size:.76rem;font-weight:500;color:var(--gold)}
.index-title{font-size:.98rem;line-height:1.6}
.band--paper .index-item,.card .index-item{border-bottom-color:rgba(36,28,25,.14)}

/* ===== 10. Timeline ===== */
.timeline{position:relative;padding-left:22px;border-left:1px solid rgba(199,208,206,.3)}
.timeline-item{position:relative;padding-bottom:clamp(18px,3vw,30px)}
.timeline-item::before{
  content:"";position:absolute;left:-27px;top:.55em;
  width:10px;height:10px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 3px rgba(226,118,47,.2);
}
.timeline-date{font-family:var(--font-mono);font-size:.74rem;font-weight:500;letter-spacing:.08em;color:var(--gold)}
.timeline-item h3{margin:4px 0 6px}
.band--paper .timeline{border-left-color:rgba(36,28,25,.18)}

/* ===== 11. Media frames ===== */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:4/3;
  border-radius:var(--radius-lg);
  border:1px solid rgba(199,208,206,.18);
  background:
    linear-gradient(135deg,rgba(199,208,206,.16),rgba(199,208,206,.04)),
    var(--ink-soft);
}
.media-frame > img,.media-frame > svg,.media-frame > picture,.media-frame > video{
  width:100%;height:100%;object-fit:cover;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--doc{aspect-ratio:5/7;border-radius:var(--radius-md)}
.media-frame--paper{
  background:linear-gradient(135deg,var(--paper),var(--paper-soft));
  border-color:rgba(36,28,25,.12);
}
.media-frame__label{
  position:absolute;left:12px;bottom:12px;
  padding:4px 10px;border-radius:var(--radius-pill);
  background:rgba(15,26,44,.8);color:var(--paper);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;
}
.media-frame--paper .media-frame__label{background:rgba(36,28,25,.82)}

/* ===== 12. Reveal ===== */
.has-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .45s ease,transform .45s ease}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ===== 13. Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(13,22,38,.97);
  border-bottom:1px solid rgba(199,208,206,.18);
}
.header-top{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:66px;padding-top:10px;padding-bottom:10px;
}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  flex:none;display:grid;place-items:center;
  width:42px;height:42px;border-radius:13px;
  background:var(--paper);color:var(--ink);
  font-family:var(--font-display);font-weight:700;font-size:1.15rem;line-height:1;
}
.brand-text{display:flex;flex-direction:column;line-height:1.24;min-width:0}
.brand-name{font-family:var(--font-display);font-size:1.05rem;font-weight:700;letter-spacing:.08em;color:var(--paper)}
.brand-sub{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.16em;color:var(--text-muted-on-ink);text-transform:uppercase}
.header-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(199,208,206,.4);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.08em;
  color:var(--text-on-ink);
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--accent);color:var(--accent)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .18s ease,top .18s ease;
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}
.site-nav{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  border-top:1px solid rgba(199,208,206,.14);
  padding-top:6px;padding-bottom:8px;
}
.nav-list{display:flex;align-items:center;flex-wrap:wrap;gap:4px}
.nav-list a{
  display:inline-flex;align-items:baseline;gap:9px;
  padding:8px 14px;border-radius:var(--radius-pill);
  font-size:.9rem;color:var(--text-on-ink);
  transition:background-color .18s ease,color .18s ease;
}
.nav-index{font-family:var(--font-mono);font-size:.66rem;font-weight:500;letter-spacing:.1em;color:var(--accent)}
.nav-list a:hover{background:rgba(199,208,206,.13)}
.nav-list a[aria-current="page"]{background:var(--accent);color:#12203A;font-weight:700}
.nav-list a[aria-current="page"] .nav-index{color:#12203A}
.nav-meta{
  margin:0;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--text-muted-on-ink);white-space:nowrap;
}
.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:70;
  background:rgba(199,208,206,.16);pointer-events:none;
}
.read-progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--accent),var(--gold));
  transition:width .12s linear;
}

/* ===== 14. Footer ===== */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-deep);
  border-top:1px solid rgba(199,208,206,.18);
  color:var(--text-on-ink);
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.35fr);
  gap:clamp(22px,4vw,48px);
  padding-top:clamp(34px,5.5vw,62px);
  padding-bottom:clamp(22px,4vw,40px);
}
.footer-col{min-width:0}
.brand--footer .brand-name{color:var(--paper)}
.footer-tagline{margin-top:14px;font-size:.95rem;line-height:1.85;max-width:32ch}
.footer-meta{margin-top:12px;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--text-muted-on-ink)}
.footer-title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:.72rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--gold);
}
.footer-list{display:grid;gap:10px;font-size:.92rem}
.footer-list a{
  display:inline-block;padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-list a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.footer-list--contact li{display:grid;gap:2px;line-height:1.7}
.contact-label{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--text-muted-on-ink);
}
.footer-note{margin-top:14px;font-size:.84rem;line-height:1.8;color:var(--text-muted-on-ink);max-width:34ch}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 20px;
  border-top:1px solid rgba(199,208,206,.16);
  padding-top:18px;padding-bottom:26px;
  font-family:var(--font-mono);font-size:.73rem;letter-spacing:.06em;color:var(--text-muted-on-ink);
}
.to-top{
  display:inline-flex;align-items:center;
  padding:8px 16px;border-radius:var(--radius-pill);
  border:1px solid rgba(199,208,206,.35);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.to-top:hover{border-color:var(--accent);color:var(--accent)}
.band--paper a:hover{color:var(--accent)}

/* ===== 15. Responsive ===== */
@media (max-width:960px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  html{scroll-padding-top:6rem}
  .header-top{min-height:60px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:block;max-width:none;margin:0;
    background:var(--paper);color:var(--text-on-paper);
    border-top:0;border-radius:0 0 22px 22px;
    padding:10px clamp(16px,4vw,40px) 20px;
    box-shadow:0 24px 42px -20px rgba(0,0,0,.7);
    max-height:calc(100vh - 62px);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{
    display:flex;align-items:center;gap:12px;
    padding:13px 4px;border-radius:0;
    border-bottom:1px solid rgba(36,28,25,.1);
    color:var(--text-on-paper);font-size:.96rem;
  }
  .nav-list li:last-child a{border-bottom:0}
  .nav-list a:hover{background:rgba(226,118,47,.1);color:#8A4A1E}
  .nav-list a[aria-current="page"]{
    padding-left:12px;padding-right:12px;border-radius:var(--radius-pill);
    border-bottom-color:transparent;
  }
  .nav-meta{
    margin-top:16px;padding-top:12px;
    border-top:1px solid rgba(36,28,25,.12);
    color:var(--text-muted-on-paper);white-space:normal;
  }
  .index-item{grid-template-columns:minmax(0,1fr) auto}
  .grid--sidebar{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:720px){
  .pill--ghost{display:none}
  .pill{padding:8px 14px;font-size:.8rem}
}
@media (max-width:680px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .band{padding:22px 18px}
}
@media (max-width:430px){
  .brand-sub{display:none}
  .brand-mark{width:38px;height:38px;border-radius:11px;font-size:1.05rem}
  .nav-toggle-label{display:none}
}

/* ===== 16. 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}
  .has-js [data-reveal]{opacity:1;transform:none}
  .read-progress-bar{transition:none}
  .btn:hover,.pill:hover{transform:none}
}