/* ===== 01. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote{margin:0}
ul,ol{padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
[hidden]{display:none !important}

/* ===== 02. Tokens ===== */
:root{
  --paper:#F6F1E7;
  --ink:#14110F;
  --ink-pure:#000000;
  --ochre:#C25A33;
  --ochre-deep:#8E3A1B;
  --ocean:#10557F;
  --wave:#CFE0E8;
  --gold:#E3A72F;
  --coral:#E8776A;
  --sand:#D9C7A7;
  --signal:#2E7D5B;

  --ink-80:rgba(20,17,15,.80);
  --ink-70:rgba(20,17,15,.70);
  --ink-55:rgba(20,17,15,.55);
  --line:rgba(20,17,15,.13);
  --line-strong:rgba(20,17,15,.26);
  --on-ink:rgba(246,241,231,.86);
  --on-ink-60:rgba(246,241,231,.60);
  --divider-ink:rgba(246,241,231,.16);

  --shadow-1:0 1px 2px rgba(20,17,15,.10);
  --shadow-2:0 2px 10px rgba(20,17,15,.06);

  --font-cn:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  --font-en:"Helvetica Neue",Helvetica,Arial,system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --shell:1280px;
  --gutter:16px;
  --radius:2px;
}
@media (min-width:760px){:root{--gutter:32px}}
@media (min-width:1200px){:root{--gutter:48px}}

/* ===== 03. Base type ===== */
body{
  background-color:var(--paper);
  background-image:
    linear-gradient(to right,rgba(20,17,15,.035) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(20,17,15,.035) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--ink);
  font-family:var(--font-cn);
  font-size:17px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
strong{font-weight:600}
::selection{background:var(--ochre);color:#fff}

.display{font-weight:800;font-size:clamp(56px,11vw,168px);line-height:.94;letter-spacing:-.02em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--ochre);
  text-transform:uppercase;
}
.meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ink-55);
}
.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(--ochre);outline-offset:2px;border-radius:1px}
.site-footer :focus-visible{outline-color:var(--gold)}

/* ===== 04. Layout ===== */
.container{width:min(calc(100% - (var(--gutter) * 2)),var(--shell));margin-inline:auto}
.page-main{display:block;scroll-margin-top:112px}
.section{padding:clamp(44px,6.5vw,96px) 0}
.section-head{display:grid;gap:12px;max-width:56em}
.section-index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--ochre);
  display:inline-flex;align-items:center;gap:10px;
}
.section-index::after{content:"";height:1px;width:48px;background:var(--line-strong);display:block}
.section-title{font-weight:800;font-size:clamp(28px,4.6vw,54px);line-height:1.04;letter-spacing:-.015em}
.section-lede{max-width:38em;color:var(--ink-70);font-size:16px}

.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid > *{grid-column:1 / -1;min-width:0}
@media (min-width:760px){.grid{grid-template-columns:repeat(8,1fr);gap:24px}}
@media (min-width:1080px){
  .grid{grid-template-columns:repeat(12,1fr);gap:28px}
  .c3{grid-column:span 3}
  .c4{grid-column:span 4}
  .c5{grid-column:span 5}
  .c6{grid-column:span 6}
  .c7{grid-column:span 7}
  .c8{grid-column:span 8}
  .c9{grid-column:span 9}
  .start-6{grid-column:6 / span 7}
  .start-7{grid-column:7 / span 6}
}

/* ===== 05. Buttons / tags / breadcrumb ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.82em 1.4em;
  border:1px solid var(--ink);
  border-radius:var(--radius);
  background:transparent;color:var(--ink);
  font-size:14px;font-weight:600;letter-spacing:.02em;
  cursor:pointer;
  transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.btn--primary{background:var(--ochre);border-color:var(--ochre);color:#fff}
.btn--primary:hover{background:var(--ochre-deep);border-color:var(--ochre-deep)}
.btn--ghost:hover{background:var(--ink);color:var(--paper)}
.btn--quiet{border-color:transparent;padding-inline:.6em;color:var(--ochre-deep)}
.btn--quiet:hover{color:var(--ink);border-color:var(--line-strong)}

.tag-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.tag,.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  font-size:12px;letter-spacing:.08em;
  color:var(--ink-80);
  background:var(--paper);
}
.chip{border-style:dashed;color:var(--ink-55)}
.tag-btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 14px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:transparent;color:var(--ink);
  font-size:13px;letter-spacing:.04em;
  cursor:pointer;
  transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.tag-btn:hover{border-color:var(--ink)}
.tag-btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.tag-count{font-family:var(--font-mono);font-size:11px;color:var(--ochre-deep)}
.tag-btn[aria-pressed="true"] .tag-count{color:var(--gold)}
[data-filter-item]:not([hidden]){animation:filter-in .18s ease-out both}
@keyframes filter-in{from{opacity:0}to{opacity:1}}

.breadcrumb{margin:22px 0 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.breadcrumb-item{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ochre-deep);
  display:inline-flex;align-items:center;gap:8px;
}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--sand)}
.breadcrumb-link{border-bottom:1px solid transparent;transition:border-color .18s ease-out}
.breadcrumb-link:hover{border-bottom-color:currentColor}
.breadcrumb-item[aria-current="page"]{color:var(--ink-55)}

/* ===== 06. Media / card / list ===== */
.media{
  position:relative;overflow:hidden;display:block;
  background:linear-gradient(135deg,var(--wave) 0%,rgba(217,199,167,.72) 62%,rgba(194,90,51,.28) 100%);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--21x9{aspect-ratio:21/9}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media-tag{
  position:absolute;left:12px;top:12px;z-index:2;
  padding:3px 10px;border-radius:999px;
  background:var(--paper);border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--ink);
}
.media-caption{margin-top:8px;font-size:12.5px;letter-spacing:.04em;color:var(--ink-55)}

.card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-1);
}
.card-body{padding:18px 20px 20px;display:grid;gap:8px}
.card-title{font-size:18px;font-weight:600;line-height:1.35}
.card-meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--ochre-deep)}

.row-list{list-style:none;margin:0;padding:0}
.row-item{position:relative;display:grid;gap:6px;padding:18px 0 18px 18px;border-bottom:1px solid var(--line)}
.row-item::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;
  background:var(--ochre);transform:scaleY(0);transform-origin:top;
  transition:transform .18s ease-out;
}
.row-item:hover::before{transform:scaleY(1)}
.row-title{font-size:18px;font-weight:600;line-height:1.4}
.row-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ink-55)}

/* ===== 07. Prose / side index ===== */
.prose{max-width:38em;font-size:17px;line-height:1.78;color:var(--ink-80)}
.prose--wide{max-width:42em}
.prose p + p{margin-top:1em}
.prose h2{margin:1.8em 0 .5em;font-weight:800;font-size:clamp(24px,3vw,34px);line-height:1.15;letter-spacing:-.01em;color:var(--ink)}
.prose h3{margin:1.5em 0 .4em;font-size:20px;font-weight:600;color:var(--ink)}
.prose ul,.prose ol{padding-left:1.25em;margin:.6em 0}
.prose li + li{margin-top:.4em}
.prose a{color:var(--ochre-deep);border-bottom:1px solid currentColor}
.prose a:hover{color:var(--ink)}

.side-index{position:sticky;top:130px;align-self:start;font-size:13.5px}
.side-index-title{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;color:var(--ochre);margin-bottom:12px}
.side-index ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.side-index a{
  display:flex;gap:9px;padding:7px 0;
  color:var(--ink-70);
  border-bottom:1px solid transparent;
  transition:color .18s ease-out;
}
.side-index a::before{
  content:"";flex:none;width:6px;height:6px;margin-top:9px;
  border-radius:50%;border:1px solid var(--line-strong);
}
.side-index a:hover{color:var(--ink)}
.side-index a.is-active{color:var(--ink);font-weight:600}
.side-index a.is-active::before{background:var(--gold);border-color:var(--gold)}

/* ===== 08. Reveal / progress ===== */
.has-reveal .reveal,
.has-reveal [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .4s ease-out,transform .4s ease-out;
}
.has-reveal .reveal.is-in,
.has-reveal [data-reveal].is-in{opacity:1;transform:none}
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;z-index:120;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--ochre) 0%,var(--gold) 100%);
  pointer-events:none;
}

/* ===== 09. Header ===== */
.skip-link{
  position:fixed;top:-100px;left:16px;z-index:200;
  padding:10px 16px;border-radius:var(--radius);
  background:var(--ink);color:var(--paper);
  font-size:13px;letter-spacing:.06em;
  transition:top .18s ease-out;
}
.skip-link:focus{top:12px}

.site-header{position:sticky;top:0;z-index:80}
.header-rail{background:var(--ink);color:var(--on-ink)}
.header-rail-inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:30px;padding:3px 0;
  font-size:11.5px;letter-spacing:.07em;
}
.rail-idx{
  font-family:var(--font-mono);color:var(--on-ink-60);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rail-status{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  color:var(--on-ink);white-space:nowrap;
}
.status-dot{
  flex:none;width:7px;height:7px;border-radius:50%;
  background:var(--signal);box-shadow:0 0 0 3px rgba(46,125,91,.24);
}
.header-bar{background:var(--paper);border-bottom:1px solid var(--line-strong)}
.header-bar-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:0 20px;min-height:64px;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0;padding:10px 0}
.brand-mark{
  flex:none;display:grid;place-items:center;
  width:38px;height:38px;border-radius:var(--radius);
  background:var(--ochre);color:#fff;
  font-weight:800;font-size:14px;line-height:1;letter-spacing:0;
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-weight:800;font-size:16px;line-height:1.25;letter-spacing:.02em}
.brand-line{
  display:none;
  font-family:var(--font-en);font-size:11.5px;letter-spacing:.08em;color:var(--ink-55);
}
@media (min-width:520px){.brand-line{display:block}}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--line-strong);border-radius:var(--radius);
  background:transparent;color:var(--ink);
  font-size:12.5px;letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .18s ease-out;
}
.nav-toggle:hover{border-color:var(--ink)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;background:var(--ink);transition:background-color .18s ease-out}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink);
  transition:transform .2s ease-out;
}
.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{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}

.site-nav{display:none;flex:1 0 100%}
.site-nav[data-open]{
  display:block;flex:1 0 100%;
  border-top:1px solid var(--line);
  padding:6px 0 18px;
  max-height:calc(100vh - 110px);
  overflow-y:auto;
}
.nav-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.nav-item{min-width:0}
.nav-link{
  display:flex;align-items:baseline;gap:10px;
  padding:13px 0;border-bottom:1px solid var(--line);
  font-size:15px;color:var(--ink);
  transition:color .18s ease-out;
}
.nav-idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--ochre)}
.nav-link:hover{color:var(--ochre-deep)}
.nav-cta{
  display:flex;align-items:center;justify-content:center;
  margin-top:16px;padding:12px 18px;
  border-radius:var(--radius);
  background:var(--ochre);color:#fff;
  font-size:13.5px;font-weight:600;letter-spacing:.04em;
  transition:background-color .18s ease-out;
}
.nav-cta:hover{background:var(--ochre-deep)}

@media (min-width:980px){
  .nav-toggle{display:none}
  .site-nav,
  .site-nav[data-open]{
    display:flex;flex:0 1 auto;align-items:center;gap:6px;
    border-top:0;padding:0;max-height:none;overflow:visible;
  }
  .nav-list{flex-direction:row;align-items:center;gap:2px}
  .nav-link{
    padding:9px 12px;border-bottom:0;border-radius:var(--radius);
    font-size:13.5px;letter-spacing:.02em;position:relative;
  }
  .nav-link::after{
    content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;
    background:var(--ochre);transform:scaleX(0);transform-origin:left center;
    transition:transform .18s ease-out;
  }
  .nav-link:hover::after{transform:scaleX(1)}
  .nav-link[aria-current="page"]{font-weight:600;color:var(--ochre-deep)}
  .nav-link[aria-current="page"] .nav-idx{color:var(--ochre-deep)}
  .nav-link[aria-current="page"]::after{transform:scaleX(1)}
  .nav-cta{margin-top:0;margin-left:12px;display:inline-flex;padding:10px 16px;font-size:13px}
}

/* ===== 10. Footer ===== */
.site-footer{position:relative;margin-top:clamp(56px,8vw,110px);background:var(--ink);color:var(--on-ink)}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--ochre) 0 34%,var(--ocean) 34% 62%,var(--gold) 62% 84%,var(--coral) 84% 100%);
}
.footer-shell{padding:clamp(46px,6vw,78px) 0 0}
.footer-lead{max-width:34em}
.footer-eyebrow{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;color:var(--gold)}
.footer-title{margin-top:12px;font-weight:800;font-size:clamp(30px,5vw,56px);line-height:1;letter-spacing:-.01em;color:var(--paper)}
.footer-note{margin-top:12px;font-size:14px;line-height:1.7;color:var(--on-ink-60);max-width:34em}
.footer-cta{
  display:inline-flex;align-items:center;gap:8px;margin-top:20px;
  padding:11px 18px;border:1px solid var(--ochre);border-radius:var(--radius);
  background:var(--ochre);color:#fff;
  font-size:13.5px;font-weight:600;letter-spacing:.04em;
  transition:background-color .18s ease-out,border-color .18s ease-out;
}
.footer-cta::after{content:"→";font-family:var(--font-mono)}
.footer-cta:hover{background:var(--ochre-deep);border-color:var(--ochre-deep)}

.footer-index{
  display:grid;grid-template-columns:1fr;gap:28px;
  margin-top:40px;padding-top:36px;border-top:1px solid var(--divider-ink);
}
@media (min-width:640px){.footer-index{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.footer-index{grid-template-columns:repeat(4,1fr);gap:40px}}
.footer-col{min-width:0}
.footer-col-title{font-size:12px;font-weight:600;letter-spacing:.16em;color:var(--on-ink-60);margin-bottom:14px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-links a{
  display:inline-block;font-size:14.5px;color:var(--on-ink);
  border-bottom:1px solid transparent;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.footer-links a:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer-contact{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-contact li{display:grid;gap:2px}
.contact-key{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--gold)}
.contact-val{font-size:13.5px;line-height:1.6;color:var(--on-ink);word-break:break-word}
.footer-contact-note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--on-ink-60)}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  margin-top:44px;padding:20px 0 26px;
  border-top:1px solid var(--divider-ink);
  font-size:12px;letter-spacing:.06em;color:var(--on-ink-60);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:.04em}

/* ===== 11. Motion fallback ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-delay:0ms !important;
    transition-duration:.001ms !important;
  }
  .has-reveal .reveal,
  .has-reveal [data-reveal]{opacity:1 !important;transform:none !important}
}