/* ============ reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:#F7F1E3;
  background-image:
    linear-gradient(to right,rgba(111,122,100,.075) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(111,122,100,.075) 1px,transparent 1px);
  background-size:76px 76px;
  color:#1F2A24;
  font-family:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:#A64B35}
a:hover{color:#8B6A2E}

/* ============ variables ============ */
:root{
  --paper:#F7F1E3;
  --paper-2:#EFE5D2;
  --gold:#C9A45C;
  --gold-deep:#8B6A2E;
  --ink:#1F2A24;
  --ink-green:#244B3A;
  --brick:#A64B35;
  --brick-soft:#D9A08D;
  --rule:#6F7A64;
  --highlight:#E8D9A8;
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono","Sarasa Mono SC","Courier New",monospace;
  --wrap:1180px;
  --edge:clamp(1.25rem,4.5vw,3rem);
  --shadow:6px 6px 0 rgba(31,42,36,.16);
}

/* ============ type ============ */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.22;letter-spacing:.015em;color:var(--ink)}
h1{font-size:clamp(2rem,4.4vw,3.5rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.25rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.45rem)}
h4{font-size:1.05rem}
p{max-width:70ch}
strong{font-weight:700}

/* ============ layout ============ */
.shell{width:min(100% - (var(--edge) * 2),var(--wrap));margin-inline:auto}
.shell--narrow{width:min(100% - (var(--edge) * 2),68ch);margin-inline:auto}
.section{padding-block:clamp(2.75rem,6vw,5.5rem)}
.section--tint{background:var(--paper-2)}
.grid{display:grid;gap:clamp(1rem,2.2vw,1.75rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.eyebrow{
  display:inline-block;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.2em;
  color:var(--gold-deep);text-transform:uppercase;
}
.section-index{
  display:block;
  font-family:var(--mono);font-weight:600;
  font-size:clamp(2.2rem,6vw,4.25rem);line-height:.85;
  letter-spacing:-.02em;color:var(--gold-deep);
}
.tag{
  display:inline-flex;align-items:center;gap:.3rem;
  padding:.16rem .55rem;
  border:1px solid var(--gold-deep);
  background:var(--highlight);color:var(--ink-green);
  font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;
}

/* ============ breadcrumb ============ */
.breadcrumb{font-family:var(--mono);font-size:.76rem;color:var(--rule);padding-block:.85rem 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:.35rem;align-items:baseline}
.breadcrumb li{display:inline-flex;align-items:baseline;gap:.35rem}
.breadcrumb li:not(:last-child)::after{content:"/";color:var(--gold-deep)}
.breadcrumb a{color:var(--ink-green);text-decoration:none;border-bottom:1px solid var(--gold)}
.breadcrumb a:hover{color:var(--brick);border-bottom-color:var(--brick)}
.breadcrumb [aria-current="page"]{color:var(--brick)}

/* ============ buttons ============ */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.68rem 1.15rem;
  border:1.5px solid var(--ink);
  background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:.95rem;font-weight:600;
  text-decoration:none;cursor:pointer;
  box-shadow:4px 4px 0 var(--ink);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease;
}
.btn:hover,.btn:focus-visible{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--ink);color:var(--ink)}
.btn:active{transform:translate(0,0);box-shadow:2px 2px 0 var(--ink)}
.btn--brick{background:var(--brick);color:var(--paper);border-color:var(--ink)}
.btn--brick:hover,.btn--brick:focus-visible{background:#8F3E2B;color:var(--paper)}
.btn--ghost{background:transparent;box-shadow:none;border-color:var(--rule);color:var(--ink-green)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--highlight);border-color:var(--gold-deep);box-shadow:none;transform:none}

/* ============ cards & media ============ */
.card{
  background:var(--paper-2);
  border:1.5px solid var(--ink);
  box-shadow:var(--shadow);
  padding:clamp(1rem,2vw,1.5rem);
  transition:transform .2s ease,box-shadow .2s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:8px 8px 0 rgba(31,42,36,.2)}
.media-frame{
  --media-ratio:4 / 3;
  position:relative;display:block;width:100%;
  aspect-ratio:var(--media-ratio);
  border:1.5px solid var(--ink);
  background-color:var(--paper-2);
  background-image:
    repeating-linear-gradient(135deg,rgba(201,164,92,.3) 0 10px,transparent 10px 20px);
  overflow:hidden;
}
.media-frame > img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{--media-ratio:16 / 9}
.media-frame--tall{--media-ratio:3 / 4}
.media-frame--square{--media-ratio:1 / 1}
.margin-note{
  border-left:3px solid var(--brick);
  background:rgba(232,217,168,.55);
  padding:.6rem .8rem;
  font-family:var(--mono);font-size:.76rem;line-height:1.65;
  color:var(--ink-green);
  transform:rotate(-1.2deg);
}

/* ============ skip link ============ */
.skip-link{
  position:fixed;top:.5rem;left:.5rem;z-index:200;
  padding:.6rem 1rem;
  background:var(--ink-green);color:var(--paper);
  font-family:var(--mono);font-size:.8rem;letter-spacing:.06em;
  text-decoration:none;border:2px solid var(--gold);
  transform:translateY(-160%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0);color:var(--paper)}

/* ============ header ============ */
.site-header{
  --line-color:rgba(111,122,100,.45);
  --line-soft:rgba(111,122,100,.22);
  --accent:var(--brick);
  --brand-accent:var(--gold-deep);
  --slot-bg:rgba(255,255,255,.42);
  position:sticky;top:0;z-index:60;
  background:transparent;
  color:var(--ink);
  border-bottom:1px solid transparent;
  transition:background-color .28s ease,color .28s ease,box-shadow .28s ease,border-color .28s ease;
}
.site-header[data-scrolled="true"],
.site-header[data-open="true"]{
  --line-color:rgba(232,217,168,.34);
  --line-soft:rgba(232,217,168,.18);
  --accent:var(--brick-soft);
  --brand-accent:var(--gold);
  --slot-bg:rgba(232,217,168,.1);
  color:var(--paper);
}
.site-header[data-scrolled="true"]{
  background:var(--ink-green);
  border-bottom-color:var(--gold-deep);
  box-shadow:0 3px 0 rgba(31,42,36,.18);
}
.header-index{
  width:min(100% - (var(--edge) * 2),var(--wrap));
  margin-inline:auto;
  display:flex;align-items:center;gap:.75rem;
  padding-top:.4rem;
  font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;
  color:var(--rule);
  transition:color .28s ease;
}
.site-header[data-scrolled="true"] .header-index{color:rgba(232,217,168,.66)}
.header-index-mark{white-space:nowrap}
.header-index-rule{flex:1 1 auto;height:1px;background:currentColor;opacity:.5}
.header-inner{
  width:min(100% - (var(--edge) * 2),var(--wrap));
  margin-inline:auto;
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"brand nav toggle" "quick quick quick";
  align-items:center;
  gap:.4rem 1.5rem;
  padding-block:.5rem .55rem;
}
.brand{
  grid-area:brand;
  display:inline-flex;align-items:center;gap:.65rem;
  text-decoration:none;color:inherit;
}
.brand:hover,.brand:focus-visible{color:inherit}
.brand-mark{
  display:grid;place-items:center;
  width:2.4rem;height:2.4rem;
  background:var(--gold);color:var(--ink);
  border:1.5px solid currentColor;
  box-shadow:3px 3px 0 var(--ink-green);
  font-family:var(--serif);font-weight:700;font-size:1.1rem;line-height:1;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--serif);font-weight:600;font-size:1.06rem;letter-spacing:.06em}
.brand-tagline{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;color:var(--brand-accent)}
.nav-toggle{
  grid-area:toggle;
  display:none;align-items:center;gap:.55rem;
  padding:.45rem .7rem;
  border:1.5px solid var(--line-color);
  background:var(--slot-bg);
  color:inherit;cursor:pointer;
  font-family:var(--mono);font-size:.76rem;letter-spacing:.12em;
}
.nav-toggle:hover{border-color:var(--accent)}
.nav-toggle-bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background-color .2s ease}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform .2s ease;
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}
.nav-drawer{display:contents}
.primary-nav{grid-area:nav;display:flex;justify-content:flex-end}
.nav-list{
  display:flex;flex-wrap:wrap;justify-content:flex-end;align-items:center;
  gap:.1rem;counter-reset:navidx;
}
.nav-list li{counter-increment:navidx}
.nav-link{
  display:inline-flex;align-items:baseline;gap:.4rem;
  padding:.5rem .62rem;
  font-size:.88rem;font-weight:500;letter-spacing:.02em;
  color:inherit;text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s ease,background-color .2s ease,border-color .2s ease;
}
.nav-link::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--mono);font-size:.64rem;letter-spacing:.06em;
  color:var(--brand-accent);
}
.nav-link:hover,.nav-link:focus-visible{
  color:var(--accent);
  border-bottom-color:var(--accent);
  background:var(--slot-bg);
}
.nav-link[aria-current="page"]{
  color:var(--brick);
  background:var(--highlight);
  border-bottom-color:var(--brick);
}
.site-header[data-scrolled="true"] .nav-link[aria-current="page"],
.site-header[data-open="true"] .nav-link[aria-current="page"]{
  color:var(--ink);
  background:var(--gold);
  border-bottom-color:var(--brick);
}
.quick-slots{
  grid-area:quick;
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:.5rem;
  padding-top:.55rem;
  border-top:1px solid var(--line-soft);
}
.quick-slot{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:.6rem;
  padding:.42rem .7rem;
  border:1px solid var(--line-color);
  background:var(--slot-bg);
  color:inherit;text-decoration:none;
  transition:transform .18s ease,border-color .18s ease,background-color .18s ease,box-shadow .18s ease;
}
.quick-slot:hover,.quick-slot:focus-visible{
  transform:translateY(-2px);
  border-color:var(--accent);
  box-shadow:3px 3px 0 rgba(31,42,36,.22);
  color:inherit;
}
.quick-slot-index{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;color:var(--brand-accent)}
.quick-slot-body{display:flex;flex-direction:column;line-height:1.3;min-width:0}
.quick-slot-label{font-size:.86rem;font-weight:600;letter-spacing:.02em}
.quick-slot-meta{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.06em;
  color:var(--brand-accent);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.quick-slot-arrow{font-family:var(--mono);font-size:.9rem;color:var(--accent)}
.header-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:3px;
  background:rgba(111,122,100,.2);
  pointer-events:none;
}
.site-header[data-scrolled="true"] .header-progress{background:rgba(232,217,168,.18)}
.header-progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--brick),var(--gold));
  transition:width .12s linear;
}

/* ============ footer ============ */
.site-footer{
  position:relative;
  margin-top:clamp(2.5rem,6vw,5rem);
  padding-top:clamp(2.25rem,4vw,3.25rem);
  background-color:var(--ink-green);
  background-image:linear-gradient(rgba(232,217,168,.055) 1px,transparent 1px);
  background-size:100% 34px;
  border-top:6px solid var(--gold);
  color:var(--paper);
}
.footer-grid{
  width:min(100% - (var(--edge) * 2),var(--wrap));
  margin-inline:auto;
  display:grid;
  grid-template-columns:1.5fr 1fr 1.25fr 1fr;
  gap:clamp(1.5rem,3vw,2.75rem);
  padding-bottom:clamp(1.75rem,3vw,2.5rem);
  border-bottom:1px solid rgba(232,217,168,.26);
}
.footer-mark{font-family:var(--serif);font-size:1.55rem;font-weight:600;color:var(--gold);letter-spacing:.08em}
.footer-line{font-family:var(--serif);font-size:1rem;color:var(--paper);margin-top:.35rem;max-width:26ch}
.footer-note{
  font-family:var(--mono);font-size:.72rem;line-height:1.75;
  letter-spacing:.04em;color:rgba(247,241,227,.66);
  margin-top:.85rem;max-width:34ch;
}
.footer-col{min-width:0}
.footer-heading{
  display:flex;align-items:baseline;gap:.5rem;
  font-family:var(--mono);font-size:.72rem;font-weight:500;
  letter-spacing:.2em;color:var(--gold);
  padding-bottom:.6rem;margin-bottom:.75rem;
  border-bottom:1px solid rgba(232,217,168,.26);
}
.footer-index{font-size:.66rem;color:rgba(232,217,168,.6)}
.footer-list{display:flex;flex-direction:column;gap:.45rem}
.footer-link{
  display:inline-block;
  color:var(--paper);text-decoration:none;font-size:.9rem;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--gold);border-bottom-color:var(--gold)}
.footer-facts{gap:.2rem}
.footer-fact{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:.15rem .65rem;align-items:baseline;
  padding-block:.34rem;
  border-bottom:1px dashed rgba(232,217,168,.22);
}
.footer-fact-label{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;color:var(--gold)}
.footer-fact-value{
  font-size:.84rem;line-height:1.55;color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-base{
  width:min(100% - (var(--edge) * 2),var(--wrap));
  margin-inline:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;
  gap:.6rem 1.5rem;
  padding-block:1.1rem 1.5rem;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;
  color:rgba(247,241,227,.72);
}
.footer-copy,.footer-icp{max-width:none}
.footer-icp{color:rgba(232,217,168,.78)}

/* ============ reveal & toc ============ */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-revealed{opacity:1;transform:none}
[data-toc] a.is-current{
  color:var(--brick);
  background:var(--highlight);
  border-color:var(--brick);
}

/* ============ focus ============ */
:focus-visible{outline:3px solid var(--brick);outline-offset:3px}
.site-header[data-scrolled="true"] :focus-visible,
.site-header[data-open="true"] :focus-visible,
.site-footer :focus-visible{outline-color:var(--highlight)}

/* ============ responsive ============ */
@media (max-width:1180px){
  .quick-slot-meta{display:none}
}
@media (max-width:1060px){
  .header-index{display:none}
  .header-inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:"brand toggle" "drawer drawer";
    gap:.5rem;
    padding-block:.55rem .6rem;
  }
  .nav-toggle{display:inline-flex}
  .nav-drawer{
    grid-area:drawer;
    display:none;
    margin-top:.4rem;
    padding-top:.75rem;
    border-top:1px solid var(--line-color);
    max-height:calc(100dvh - 8rem);
    overflow-y:auto;
  }
  .site-header[data-open="true"]{
    background:var(--ink-green);
    border-bottom-color:var(--gold-deep);
    box-shadow:0 3px 0 rgba(31,42,36,.18);
  }
  .site-header[data-open="true"] .nav-drawer{display:block}
  .primary-nav{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;justify-content:flex-start;
    padding:.72rem .2rem .72rem .55rem;
    font-size:1rem;
    border-bottom:1px solid var(--line-soft);
    border-left:3px solid transparent;
  }
  .nav-link::before{width:2.1rem;flex:0 0 auto}
  .nav-link:hover,.nav-link:focus-visible{border-bottom-color:var(--line-soft);border-left-color:var(--accent);background:var(--slot-bg)}
  .nav-link[aria-current="page"],
  .site-header[data-scrolled="true"] .nav-link[aria-current="page"],
  .site-header[data-open="true"] .nav-link[aria-current="page"]{
    color:var(--ink);background:var(--highlight);
    border-left-color:var(--brick);border-bottom-color:var(--line-soft);
  }
  .quick-slots{
    grid-template-columns:1fr;
    margin-top:.85rem;
    padding-top:.7rem;
  }
  .quick-slot{padding:.6rem .7rem}
  .quick-slot-meta{display:block;white-space:normal}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  body{font-size:16px;line-height:1.75}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:1.5rem}
  .footer-base{font-size:.68rem;letter-spacing:.05em}
  .btn{width:100%;justify-content:center}
  .margin-note{transform:none}
}

/* ============ motion & print ============ */
@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]{opacity:1;transform:none}
  .card:hover{transform:none}
  .quick-slot:hover{transform:none}
  .margin-note{transform:none}
}
@media print{
  .site-header,.skip-link,.header-progress,.nav-toggle{display:none !important}
  body{background:#fff;color:#000}
  .site-footer{background:#fff;color:#000;border-top:1px solid #000}
  .footer-link,.footer-mark,.footer-heading{color:#000}
  .card{box-shadow:none}
}