/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ===== tokens ===== */
:root{
  --clay-deep:#2E0F08;
  --clay:#8C2E1A;
  --clay-light:#C2543A;
  --sand:#F6EBE5;
  --sand-deep:#EADCD3;
  --lime:#C8FF3D;
  --lime-deep:#6F8F1B;
  --space:#101C33;
  --silver:#C7CDD4;
  --ink:#161210;
  --ink-soft:#6A5850;

  --wrap:1240px;
  --r-sm:10px;
  --r-md:18px;
  --r-lg:28px;
  --r-pill:999px;
  --gap:clamp(18px,3vw,40px);
  --shadow-lift:0 22px 44px -28px rgba(46,15,8,.6);

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,"Liberation Mono",monospace;

  --fs-display:clamp(2.75rem,8vw,5.5rem);
  --fs-xl:clamp(1.9rem,4.2vw,2.5rem);
  --fs-lg:clamp(1.5rem,2.6vw,1.75rem);
  --fs-md:clamp(1.25rem,1.8vw,1.375rem);
  --fs-body:clamp(1.0625rem,1.1vw,1.1875rem);
  --fs-sm:clamp(.9375rem,1vw,1rem);
  --fs-xs:.8125rem;
}

/* ===== base ===== */
body{
  font-family:var(--font-sans);
  font-size:var(--fs-body);
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background:var(--sand);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(140,46,26,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,46,26,.10) 1px,transparent 1px);
  background-size:48px 48px;
  background-position:center top;
}
:focus-visible{outline:3px solid var(--lime);outline-offset:3px;border-radius:4px}
.btn--accent:focus-visible,.tool-btn--accent:focus-visible,.nav-toggle:focus-visible{outline-color:var(--ink)}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}

/* ===== typography helpers ===== */
.h-display{font-size:var(--fs-display);font-weight:900;line-height:.96;letter-spacing:-.02em}
.h-xl{font-size:var(--fs-xl);font-weight:900;line-height:1.06;letter-spacing:-.01em}
.h-lg{font-size:var(--fs-lg);font-weight:900;line-height:1.16}
.h-md{font-size:var(--fs-md);font-weight:700;line-height:1.32}
.lede{font-size:var(--fs-md);line-height:1.62;color:var(--ink-soft);max-width:30em}
.prose p{max-width:36em;margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.mono,.num{font-family:var(--font-mono);letter-spacing:.04em}
.eyebrow{font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.2em;text-transform:uppercase;color:var(--clay)}

/* ===== layout ===== */
.wrap{width:min(100% - 32px,var(--wrap));margin-inline:auto}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;padding-bottom:16px;margin-bottom:clamp(24px,3vw,40px);
  border-bottom:1px solid rgba(140,46,26,.22);
}
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border-radius:var(--r-pill);border:2px solid transparent;
  font-size:var(--fs-sm);font-weight:700;line-height:1;cursor:pointer;
  transition:transform .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.btn--accent{background:var(--lime);color:var(--ink);border-color:var(--ink);box-shadow:4px 4px 0 var(--ink)}
.btn--accent:hover{transform:translate(-2px,-2px);box-shadow:7px 7px 0 var(--ink)}
.btn--clay{background:var(--clay);color:var(--sand)}
.btn--clay:hover{background:var(--clay-light)}
.btn--outline{border-color:var(--clay);color:var(--clay);background:transparent}
.btn--outline:hover{background:var(--clay);color:var(--sand)}
.btn--outline-light{border-color:rgba(199,205,212,.55);color:var(--sand);background:transparent}
.btn--outline-light:hover{background:var(--sand);color:var(--ink);border-color:var(--sand)}

/* ===== plaque / tag / card ===== */
.plaque{
  display:inline-flex;flex-direction:column;gap:4px;
  padding:12px 18px;border-radius:var(--r-sm);
  background:rgba(16,28,51,.06);border-left:4px solid var(--lime);
}
.plaque-label{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.plaque-value{font-weight:700;line-height:1.35}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  border:1px solid rgba(140,46,26,.38);
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;color:var(--clay);
}
.card{
  background:#fff;border:1px solid rgba(140,46,26,.14);
  border-radius:var(--r-lg);padding:clamp(20px,3vw,34px);box-shadow:var(--shadow-lift);
}
.card--dark{background:var(--space);color:var(--silver);border-color:rgba(199,205,212,.2)}
.card--dark .h-md,.card--dark .h-lg{color:var(--sand)}

/* ===== media frames ===== */
.media-frame{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-lg);background:var(--clay-deep);isolation:isolate;
}
.media-frame>img,.media-frame>svg,.media-frame>picture>img{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:
    linear-gradient(rgba(199,205,212,.28) 1px,transparent 1px),
    linear-gradient(90deg,rgba(199,205,212,.28) 1px,transparent 1px),
    linear-gradient(180deg,rgba(46,15,8,0) 45%,rgba(46,15,8,.72) 100%);
  background-size:40px 40px,40px 40px,100% 100%;
}
.media-frame--plain::after{background-image:none}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--photo{aspect-ratio:3/2}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-caption{
  position:absolute;left:16px;bottom:16px;z-index:2;
  display:inline-flex;align-items:center;gap:8px;max-width:calc(100% - 32px);
  padding:8px 14px;border-radius:var(--r-pill);
  background:rgba(22,18,16,.8);color:var(--sand);
  font-size:var(--fs-xs);font-weight:600;line-height:1.4;
}

/* ===== breadcrumb ===== */
.breadcrumb{margin-bottom:20px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:0 8px;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;color:var(--ink-soft)}
.breadcrumb-list li{display:flex;align-items:center;gap:8px}
.breadcrumb-list li+li::before{content:"/";color:var(--clay-light)}
.breadcrumb-list a:hover{color:var(--clay);text-decoration:underline;text-underline-offset:3px}
.breadcrumb-list [aria-current="page"]{color:var(--ink)}

/* ===== filter + index ===== */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.filter-pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 18px;border-radius:var(--r-pill);
  border:2px solid rgba(140,46,26,.32);background:transparent;color:var(--ink);
  font-size:var(--fs-sm);font-weight:700;cursor:pointer;
  transition:background-color .16s ease,border-color .16s ease,color .16s ease;
}
.filter-pill::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--silver);transition:background-color .16s ease}
.filter-pill:hover{border-color:var(--clay);background:rgba(194,84,58,.12)}
.filter-pill[aria-pressed="true"]{background:var(--ink);border-color:var(--lime);color:var(--sand)}
.filter-pill[aria-pressed="true"]::before{background:var(--lime)}
.filter-status{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;color:var(--ink-soft)}
.is-filtered-out{display:none!important}
.index-list{display:grid;gap:10px}
.index-item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  gap:16px;align-items:center;
  padding:16px 20px;border-radius:var(--r-md);
  background:#fff;border:1px solid rgba(140,46,26,.14);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.index-item:hover{transform:translateY(-2px);border-color:var(--clay-light);box-shadow:var(--shadow-lift)}

/* ===== reveal ===== */
.js-ready [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .24s ease,transform .24s ease}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ===== skip link ===== */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:120;
  padding:12px 22px;border-radius:var(--r-pill);
  background:var(--ink);color:var(--lime);font-weight:700;font-size:var(--fs-sm);
  transition:top .18s ease;
}
.skip-link:focus{top:14px}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--sand);
  border-bottom:6px solid var(--clay);
}
.header-inner{
  width:min(100% - 32px,var(--wrap));
  margin-inline:auto;
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(14px,2.4vw,34px);
  padding:14px 0 12px;
}
.edge-frame{position:fixed;inset:0;z-index:55;pointer-events:none}
.edge-frame::before,.edge-frame::after{
  content:"";position:absolute;top:0;bottom:0;width:1px;
  background:linear-gradient(180deg,var(--clay) 0%,rgba(140,46,26,.22) 30%,rgba(140,46,26,.1) 100%);
}
.edge-frame::before{left:10px}
.edge-frame::after{right:10px}
.frame-rail{
  position:absolute;left:0;right:0;bottom:-20px;height:14px;
  pointer-events:none;opacity:.75;
  background-image:repeating-linear-gradient(90deg,var(--clay-light) 0 1px,transparent 1px 48px);
}

.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  position:relative;flex:none;width:42px;height:42px;border-radius:14px;
  background:var(--clay);display:grid;place-items:center;
}
.brand-mark::before{content:"";width:20px;height:20px;border-radius:50%;border:3px solid var(--sand)}
.brand-mark::after{
  content:"";position:absolute;right:-4px;bottom:-4px;width:14px;height:14px;border-radius:50%;
  background:var(--lime);border:2px solid var(--sand);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-size:1.25rem;font-weight:900;letter-spacing:.02em;color:var(--ink);line-height:1.1}
.brand-domain{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.06em;color:var(--ink-soft);line-height:1.4;margin-top:2px}

.site-nav{min-width:0}
.nav-list{display:flex;align-items:center;flex-wrap:wrap;gap:2px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  padding:9px 14px;border-radius:var(--r-pill);
  font-size:var(--fs-sm);font-weight:500;color:var(--ink);white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,box-shadow .18s ease;
}
.nav-link::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--clay-light);opacity:0;transition:opacity .18s ease,background-color .18s ease;
}
.nav-link:hover{background:rgba(194,84,58,.16)}
.nav-link:hover::before{opacity:.7}
.nav-link[aria-current="page"]{background:var(--ink);color:var(--sand);box-shadow:inset 0 0 0 2px var(--lime)}
.nav-link[aria-current="page"]::before{opacity:1;background:var(--lime)}

.header-tools{display:flex;align-items:center;gap:10px;justify-self:end}
.tool-btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:9px 16px;border-radius:var(--r-pill);
  font-size:var(--fs-xs);font-weight:700;letter-spacing:.02em;white-space:nowrap;
  transition:transform .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.tool-btn--ghost{border:2px solid var(--clay);color:var(--clay);background:transparent}
.tool-btn--ghost:hover{background:var(--clay);color:var(--sand)}
.tool-btn--accent{background:var(--lime);color:var(--ink);border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink)}
.tool-btn--accent:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink)}
.tool-btn--accent:active{transform:translate(1px,1px);box-shadow:1px 1px 0 var(--ink)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 15px;border-radius:var(--r-pill);
  border:2px solid var(--ink);background:var(--ink);color:var(--sand);
  font-size:var(--fs-xs);font-weight:700;cursor:pointer;
}
.nav-toggle-label{letter-spacing:.02em}
.nav-toggle-bars{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--lime);transition:background-color .18s ease}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--lime);
  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)}

@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ===== footer ===== */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,132px);
  background:var(--clay-deep);
  color:var(--silver);
  clip-path:polygon(0 44px,100% 0,100% 100%,0 100%);
  padding-top:calc(44px + clamp(36px,5vw,68px));
}
.footer-inner{
  width:min(100% - 32px,var(--wrap));
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(32px,4vw,56px);
}
.footer-download{
  grid-column:1;grid-row:1;
  display:flex;flex-direction:column;align-items:flex-start;gap:14px;
  padding:clamp(20px,3vw,32px);
  border:1px solid rgba(199,205,212,.22);border-radius:var(--r-lg);
  background:rgba(246,235,229,.06);
}
.footer-kicker{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;color:var(--lime)}
.footer-download-title{font-size:var(--fs-lg);font-weight:900;line-height:1.12;color:var(--sand)}
.footer-download-note{font-size:var(--fs-sm);line-height:1.7;color:rgba(199,205,212,.86);max-width:46ch}
.download-list{display:flex;flex-wrap:wrap;gap:10px;width:100%}
.download-item{
  flex:1 1 150px;display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  padding:10px 14px;border-radius:var(--r-sm);
  background:rgba(16,28,51,.55);border:1px dashed rgba(199,205,212,.32);
}
.download-os{font-weight:700;color:var(--sand);font-size:var(--fs-sm)}
.download-ver{font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.04em;color:var(--lime)}

.footer-nav{
  grid-column:1 / -1;grid-row:2;
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap);
  padding-top:clamp(20px,3vw,34px);
  border-top:1px solid rgba(199,205,212,.22);
}
.footer-col-title{
  display:flex;align-items:center;gap:10px;margin-bottom:14px;
  font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.16em;text-transform:uppercase;color:var(--sand);
}
.footer-col-title::before{content:"";width:14px;height:2px;background:var(--lime);flex:none}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:var(--fs-sm);color:rgba(199,205,212,.86);transition:color .16s ease}
.footer-links a:hover{color:var(--lime)}

.footer-contact{
  grid-column:2;grid-row:1;
  display:flex;flex-direction:column;align-items:flex-start;gap:16px;
}
.contact-list{display:flex;flex-direction:column;gap:12px}
.contact-item{display:flex;gap:12px;align-items:baseline;font-size:var(--fs-sm)}
.contact-label{flex:none;width:3.6em;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;color:rgba(199,205,212,.6)}
.contact-value{color:var(--sand);line-height:1.6}
.contact-value--mono{font-family:var(--font-mono);letter-spacing:.04em;word-break:break-all}

.footer-legal{
  width:min(100% - 32px,var(--wrap));
  margin-inline:auto;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 28px;
  padding:20px 0;
  border-top:1px solid rgba(199,205,212,.22);
  font-size:var(--fs-xs);color:rgba(199,205,212,.72);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:.04em}

.silhouette{
  height:clamp(48px,7vw,86px);
  background:linear-gradient(180deg,rgba(194,84,58,.85),rgba(46,15,8,.2));
  clip-path:polygon(0 100%,0 64%,6% 44%,12% 68%,19% 30%,26% 60%,33% 40%,41% 72%,48% 46%,56% 74%,63% 36%,71% 66%,78% 44%,86% 70%,93% 50%,100% 68%,100% 100%);
}

/* ===== responsive ===== */
@media (max-width:1180px){
  .nav-link{padding:9px 10px;font-size:.9375rem}
  .tool-btn{padding:8px 12px}
  .brand-mark{width:38px;height:38px;border-radius:12px}
}

@media (max-width:1000px){
  .header-inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:"brand tools" "nav nav";
    row-gap:8px;
    padding:12px 0 10px;
  }
  .brand{grid-area:brand}
  .header-tools{grid-area:tools}
  .site-nav{
    grid-area:nav;
    display:none;
    padding-top:12px;
    border-top:1px dashed rgba(140,46,26,.4);
    max-height:min(64vh,520px);
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block;animation:navDrop .22s ease both}
  .nav-list{flex-direction:column;align-items:stretch;gap:6px}
  .nav-link{
    justify-content:flex-start;
    padding:13px 18px;
    font-size:1.0625rem;
    font-weight:700;
    border-radius:var(--r-md);
    background:rgba(16,28,51,.05);
  }
  .nav-toggle{display:inline-flex}
  .edge-frame{display:none}
  .grid--2,.grid--3,.grid--7-5{grid-template-columns:minmax(0,1fr)}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-download,.footer-nav,.footer-contact{grid-column:1;grid-row:auto}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer{clip-path:polygon(0 26px,100% 0,100% 100%,0 100%);padding-top:calc(26px + clamp(32px,5vw,56px))}
}

@media (max-width:600px){
  .wrap,.header-inner,.footer-inner,.footer-legal{width:min(100% - 24px,var(--wrap))}
  .brand-mark{width:34px;height:34px;border-radius:11px}
  .brand-name{font-size:1.125rem}
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .index-item{grid-template-columns:minmax(0,1fr);gap:10px}
}

@media (max-width:480px){
  .tool-btn--ghost{display:none}
  .nav-toggle-label{display:none}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
}