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

/* ============ 2. tokens ============ */
:root{
  --ink:#16181D;
  --paper:#F5F1E8;
  --paper-2:#EFEAE0;
  --paper-3:#FFFFFF;
  --graphite:#5A6072;
  --rule:#E4DED2;
  --blue:#1F6FEB;
  --blue-deep:#1A5FD0;
  --teal:#0E4F52;
  --teal-deep:#0A3B3D;
  --orange:#FF6B35;
  --wine:#7A2E3B;
  --indigo:#3A3D8F;
  --green:#14634A;
  --focus:#FFC53D;

  --rail-w:240px;
  --status-h:34px;

  --r-xl:28px;
  --r-lg:22px;
  --r-md:14px;
  --r-pill:999px;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --gutter:clamp(20px,4vw,56px);
  --shadow-1:0 1px 2px rgba(22,24,29,.06),0 10px 26px -20px rgba(22,24,29,.38);
  --shadow-2:0 2px 5px rgba(22,24,29,.08),0 20px 44px -24px rgba(22,24,29,.46);
}

/* ============ 3. base ============ */
body{
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(228,222,210,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(228,222,210,.55) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
}
body[data-nav-open]{overflow:hidden}
h1,h2,h3,h4,h5{font-weight:900;letter-spacing:-.01em;line-height:1.2;color:var(--ink)}
h1{font-size:clamp(2.2rem,4.6vw,4rem)}
h2{font-size:clamp(1.75rem,2.6vw,2.25rem)}
h3{font-size:clamp(1.25rem,1.8vw,1.5rem)}
h4{font-size:1.25rem}
h5{font-size:1.0625rem}
p{max-width:34em}
strong{font-weight:800}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}
::selection{background:var(--blue);color:#fff}

.mono,code,kbd{font-family:var(--font-mono);letter-spacing:.02em}
.mono{font-size:13.5px;line-height:1.7;color:var(--graphite)}

/* ============ 4. layout ============ */
.shell{width:100%;max-width:1180px;margin-inline:0;padding-inline:var(--gutter)}
.section{padding-block:clamp(56px,8vw,124px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.rule{height:1px;background:var(--rule);border:0}
.colorbar{height:4px;background:var(--blue)}
.colorbar--orange{background:var(--orange)}
.colorbar--wine{background:var(--wine)}
.colorbar--indigo{background:var(--indigo)}

.band{background:var(--teal);color:var(--paper)}
.band--wine{background:var(--wine)}
.band--indigo{background:var(--indigo)}
.band--quiet{background:var(--paper-2);color:var(--ink)}
.band h1,.band h2,.band h3,.band h4,.band h5{color:inherit}
.band .lede,.band .prose,.band .mono{color:rgba(245,241,232,.86)}
.band .eyebrow{color:rgba(245,241,232,.72)}
.band .eyebrow::before{background:var(--paper)}
.band .note{border-color:rgba(245,241,232,.32);color:rgba(245,241,232,.82)}
.band .note__title{color:var(--paper)}
.band .section-head{border-color:rgba(245,241,232,.38)}
.band .section-head__num{color:var(--focus)}
.band .section-head__meta{color:rgba(245,241,232,.72)}
.band .index-list,.band .index-row{border-color:rgba(245,241,232,.18)}
.band .index-row:hover{background:rgba(245,241,232,.08)}
.band .index-row__meta{color:rgba(245,241,232,.7)}
.band .rule{background:rgba(245,241,232,.22)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,24px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}
.bleed-right{margin-right:calc(-1 * clamp(20px,6vw,96px))}

/* ============ 5. typography helpers ============ */
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--graphite)}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--blue);flex:none}
.lede{font-size:clamp(1.05rem,1.5vw,1.2rem);line-height:1.7;color:var(--graphite);max-width:32em}
.prose{max-width:32em}
.prose>*+*{margin-top:18px}
.prose h2{margin-top:44px}
.prose h3{margin-top:34px}
.prose ul>*+*,.prose ol>*+*{margin-top:8px}
.prose ul li{position:relative;padding-left:20px}
.prose ul li::before{content:"";position:absolute;left:2px;top:.85em;width:8px;height:2px;background:var(--blue)}
.prose a,.link{color:var(--blue);text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:3px}
.prose a:hover,.link:hover{color:var(--blue-deep)}

.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;padding-bottom:12px;border-bottom:2px solid var(--ink);margin-bottom:clamp(20px,3vw,32px)}
.section-head__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--blue)}
.section-head__title{font-size:clamp(1.35rem,2.2vw,1.75rem);font-weight:900}
.section-head__meta{margin-left:auto;font-family:var(--font-mono);font-size:12.5px;color:var(--graphite)}

.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.02em;color:var(--graphite)}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item a{color:var(--graphite);text-decoration:none}
.breadcrumbs__item a:hover{color:var(--blue)}
.breadcrumbs__sep{color:var(--rule)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

/* ============ 6. buttons / tags / status ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 22px;border-radius:var(--r-pill);border:1.5px solid transparent;font-weight:800;font-size:.95rem;letter-spacing:-.005em;text-align:center;transition:transform .16s ease-out,background-color .16s ease-out,color .16s ease-out,border-color .16s ease-out,box-shadow .16s ease-out}
.btn--signal{background:var(--blue);color:#fff}
.btn--signal:hover{background:var(--blue-deep);transform:translateY(-2px);box-shadow:var(--shadow-2)}
.btn--outline{border-color:var(--ink);color:var(--ink)}
.btn--outline:hover{background:var(--ink);color:var(--paper);transform:translateY(-2px)}
.btn--light{border-color:rgba(245,241,232,.5);color:var(--paper)}
.btn--light:hover{background:var(--paper);color:var(--teal);transform:translateY(-2px)}
.btn--quiet{background:var(--rule);color:var(--ink)}
.btn--quiet:hover{background:#D8D1C2;transform:translateY(-2px)}
.btn--ghost{border-color:var(--rule);color:var(--ink);padding:9px 16px;font-size:.875rem}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn[data-copied]{background:var(--green);border-color:transparent;color:#fff}
.btn + .copy-status{margin-left:10px}
.copy-status{font-family:var(--font-mono);font-size:12.5px;color:var(--green)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:var(--r-pill);font-family:var(--font-mono);font-size:12.5px;font-weight:700;letter-spacing:.02em;background:var(--rule);color:var(--ink)}
.tag--signal{background:var(--blue);color:#fff}
.tag--warn{background:var(--orange);color:var(--ink)}
.tag--ok{background:var(--green);color:#fff}
.tag--ghost{background:transparent;border:1px solid var(--rule);color:var(--graphite)}

.status{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12.5px;color:var(--graphite)}
.status__dot{width:8px;height:8px;border-radius:50%;background:var(--green);flex:none}
.status--ok .status__dot{background:var(--green)}
.status--warn .status__dot{background:var(--orange)}
.status--wait .status__dot{background:var(--graphite)}

/* ============ 7. modules ============ */
.panel{background:var(--paper-3);border:1px solid var(--rule);border-radius:var(--r-xl);padding:clamp(22px,3vw,34px);box-shadow:var(--shadow-1);transition:transform .16s ease-out,box-shadow .16s ease-out}
.panel--flat{box-shadow:none}
.panel--teal{background:var(--teal);color:var(--paper);border-color:transparent}
.panel--wine{background:var(--wine);color:var(--paper);border-color:transparent}
.panel--indigo{background:var(--indigo);color:var(--paper);border-color:transparent}
.panel--teal h3,.panel--teal h4,.panel--wine h3,.panel--wine h4,.panel--indigo h3,.panel--indigo h4{color:inherit}
.panel:hover{transform:translateY(-2px);box-shadow:var(--shadow-2)}

.note{border-left:3px solid var(--rule);padding:4px 0 4px 16px;font-size:15px;line-height:1.8;color:var(--graphite)}
.note--signal{border-color:var(--blue)}
.note--warn{border-color:var(--orange)}
.note__title{display:block;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin-bottom:4px}

.index-list{border-top:1px solid var(--rule)}
.index-row{display:grid;grid-template-columns:52px minmax(0,1fr) auto;align-items:center;gap:16px;padding:18px 10px;border-bottom:1px solid var(--rule);transition:background-color .16s ease-out,transform .16s ease-out}
.index-row:hover{background:rgba(31,111,235,.06);transform:translateY(-2px)}
.index-row__num{font-family:var(--font-mono);font-size:13px;color:var(--graphite)}
.index-row__title{font-weight:800;font-size:1.0625rem;letter-spacing:-.005em}
.index-row__meta{font-family:var(--font-mono);font-size:12.5px;color:var(--graphite);text-align:right}

.arrow{display:inline-block;width:8px;height:8px;border-top:1.5px solid currentColor;border-right:1.5px solid currentColor;transform:rotate(45deg);transition:transform .16s ease-out,opacity .16s ease-out}
.index-row .arrow{color:var(--blue);margin-left:6px}
.index-row:hover .arrow{transform:rotate(45deg) translate(6px,-6px)}

.tabs{display:flex;flex-wrap:wrap;gap:4px;border-bottom:2px solid var(--rule);margin-bottom:24px}
.tab{position:relative;padding:11px 18px;font-weight:800;font-size:.95rem;color:var(--graphite);border-radius:var(--r-pill) var(--r-pill) 0 0;transition:color .16s ease-out,background-color .16s ease-out}
.tab:hover{color:var(--ink);background:rgba(31,111,235,.06)}
.tab[aria-selected="true"]{color:var(--ink)}
.tab[aria-selected="true"]::after{content:"";position:absolute;left:14px;right:14px;bottom:-2px;height:3px;border-radius:2px;background:var(--blue);transition:transform .22s ease-out}
.tab-panel{padding-top:6px}

.media{margin:0}
.media__frame{position:relative;overflow:hidden;border-radius:var(--r-lg);background:var(--paper-2);border:1px solid var(--rule);aspect-ratio:16/10}
.media__frame img,.media__frame svg,.media__frame picture{width:100%;height:100%;object-fit:cover}
.media__caption{margin-top:10px;font-family:var(--font-mono);font-size:12.5px;line-height:1.7;color:var(--graphite)}
.media--wide .media__frame{aspect-ratio:21/9}
.media--device .media__frame{aspect-ratio:9/16;max-width:320px}
.media--detail .media__frame{aspect-ratio:1/1}
.media--cut .media__frame{border-top-left-radius:0}
.band .media__frame{background:rgba(245,241,232,.08);border-color:rgba(245,241,232,.18)}
.band .media__caption{color:rgba(245,241,232,.72)}

/* ============ 8. header ============ */
.skip-link{position:fixed;top:-120px;left:14px;z-index:200;background:var(--ink);color:var(--paper);padding:10px 20px;border-radius:var(--r-pill);font-weight:800;font-size:.9rem;transition:top .16s ease-out}
.skip-link:focus{top:14px}

.site-header{position:sticky;top:0;left:0;right:0;z-index:120;background:var(--teal);color:var(--paper);box-shadow:0 1px 0 rgba(22,24,29,.12)}
.status-strip{position:relative;display:flex;align-items:center;gap:10px;height:var(--status-h);padding:0 16px;background:var(--teal-deep);border-bottom:1px solid rgba(245,241,232,.14)}
.status-strip__dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(20,99,74,.35);flex:none}
.status-strip__text{font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:var(--paper);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.status-strip__code{margin-left:auto;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.02em;color:var(--focus);white-space:nowrap}
.status-strip__note{display:none}

.rail{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:11px 16px 12px;border-bottom:1px solid rgba(245,241,232,.12)}
.brandmark{display:flex;flex-direction:column;gap:1px;min-width:0}
.brandmark__name{font-weight:900;font-size:1.0625rem;letter-spacing:-.01em;line-height:1.25;color:var(--paper)}
.brandmark__sig{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.02em;color:rgba(245,241,232,.65)}

.nav-toggle{display:inline-flex;align-items:center;gap:10px;padding:9px 14px;border-radius:var(--r-pill);background:rgba(245,241,232,.1);border:1px solid rgba(245,241,232,.18);color:var(--paper);font-size:13px;font-weight:800;transition:background-color .16s ease-out}
.nav-toggle:hover{background:rgba(245,241,232,.18)}
.nav-toggle__text{font-family:var(--font-mono);letter-spacing:.06em}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px;flex:none}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .22s ease-out,opacity .22s ease-out}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

.site-nav{position:fixed;top:0;right:0;height:100%;width:min(86vw,340px);z-index:140;display:flex;flex-direction:column;gap:18px;padding:calc(var(--status-h) + 24px) 20px 30px;background:var(--teal);border-left:1px solid rgba(245,241,232,.16);overflow-y:auto;visibility:hidden;transform:translateX(104%);transition:transform .26s ease-out,visibility 0s .26s}
.site-nav[data-open]{visibility:visible;transform:translateX(0);transition:transform .26s ease-out,visibility 0s 0s}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item + .site-nav__item{border-top:1px solid rgba(245,241,232,.12)}
.site-nav__link{position:relative;display:flex;align-items:center;gap:14px;padding:15px 6px 15px 16px;color:var(--paper);transition:background-color .16s ease-out,color .16s ease-out}
.site-nav__link::before{content:"";position:absolute;left:0;top:12px;bottom:12px;width:3px;border-radius:2px;background:transparent;transition:background-color .16s ease-out}
.site-nav__link:hover{background:rgba(245,241,232,.08)}
.site-nav__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:rgba(245,241,232,.55);flex:none}
.site-nav__label{font-weight:800;font-size:1.0625rem;letter-spacing:-.01em}
.site-nav__link .arrow{margin-left:auto;opacity:0;color:var(--focus)}
.site-nav__link:hover .arrow{opacity:1;transform:rotate(45deg) translate(5px,-5px)}
.site-nav__link[aria-current="page"]{background:rgba(245,241,232,.06)}
.site-nav__link[aria-current="page"]::before{background:var(--blue)}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--focus)}
.site-nav__link[aria-current="page"] .site-nav__label{color:#fff}
.site-nav__link[aria-current="page"] .arrow{opacity:1}
.site-nav__cta{width:100%}
.site-nav__meta{margin-top:auto;font-family:var(--font-mono);font-size:11.5px;line-height:1.7;color:rgba(245,241,232,.6)}

.nav-scrim{position:fixed;inset:0;z-index:130;background:rgba(10,59,61,.55);opacity:0;pointer-events:none;transition:opacity .26s ease-out}
.nav-scrim[data-open]{opacity:1;pointer-events:auto}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{position:fixed;inset:0 auto 0 0;width:var(--rail-w);display:flex;flex-direction:column;border-right:1px solid rgba(22,24,29,.16);box-shadow:none}
  .status-strip{padding:0 14px}
  .status-strip__note{display:block;position:absolute;left:0;right:0;top:100%;padding:10px 14px 12px;background:var(--teal-deep);border-bottom:1px solid rgba(245,241,232,.14);font-size:11.5px;line-height:1.65;color:rgba(245,241,232,.82);opacity:0;transform:translateY(-4px);pointer-events:none;transition:opacity .22s ease-out,transform .22s ease-out}
  .status-strip:hover .status-strip__note,.status-strip:focus-within .status-strip__note{opacity:1;transform:translateY(0)}
  .rail{flex:1 1 auto;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:22px;padding:22px 18px 26px;border-bottom:0;overflow-y:auto}
  .brandmark{padding-bottom:16px;border-bottom:1px solid rgba(245,241,232,.16)}
  .nav-toggle{display:none}
  .site-nav{position:static;visibility:visible;transform:none;width:auto;height:auto;flex:1 1 auto;padding:0;background:none;border:0;overflow:visible;transition:none}
  .site-nav__list{border-top:1px solid rgba(245,241,232,.12)}
  .site-nav__cta{margin-top:auto;width:100%}
  .nav-scrim{display:none}
}

/* ============ 9. footer ============ */
.site-footer{margin-top:clamp(64px,9vw,132px);background:var(--teal);color:var(--paper)}
.footer-inner{max-width:1180px;padding:clamp(40px,6vw,76px) var(--gutter) 0}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(4,minmax(0,1fr));gap:36px 28px}
.footer-brand__name{font-size:1.375rem;font-weight:900;letter-spacing:-.01em;color:var(--paper)}
.footer-brand__sig{margin-top:4px;font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:rgba(245,241,232,.66)}
.footer-contact{margin-top:18px;display:flex;flex-direction:column;gap:8px;font-size:14px;line-height:1.7;color:rgba(245,241,232,.86);max-width:30ch}
.footer-contact__key{display:inline-block;min-width:3.5em;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:rgba(245,241,232,.55)}
.footer-col__title{margin-bottom:14px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:rgba(245,241,232,.58)}
.footer-list{display:flex;flex-direction:column;gap:8px}
.footer-list a{font-size:14.5px;color:rgba(245,241,232,.9);border-bottom:1px solid transparent;transition:color .16s ease-out,border-color .16s ease-out}
.footer-list a:hover{color:#fff;border-bottom-color:var(--blue)}
.footer-list__item{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-size:14.5px;color:rgba(245,241,232,.78)}
.footer-list__ver{font-family:var(--font-mono);font-size:11.5px;color:var(--focus)}
.footer-legal-note{margin-top:14px;font-size:13px;line-height:1.7;color:rgba(245,241,232,.6);max-width:26ch}
.footer-meta{margin-top:clamp(28px,4vw,46px);padding:20px 0;border-top:1px solid rgba(245,241,232,.16);display:flex;flex-wrap:wrap;gap:8px 26px;font-family:var(--font-mono);font-size:12px;color:rgba(245,241,232,.7)}
.footer-bottom{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;padding:14px var(--gutter);background:var(--teal-deep);font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;color:rgba(245,241,232,.78)}

@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px 20px}
}

/* ============ 10. grid fallbacks ============ */
@media (max-width:1000px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4{grid-column:span 3}
  .col-6,.col-8,.col-9,.col-12{grid-column:span 6}
  .bleed-right{margin-right:0}
}
@media (max-width:640px){
  body{font-size:16px}
  .grid-12{grid-template-columns:1fr;gap:18px}
  .col-3,.col-4,.col-6,.col-8,.col-9,.col-12{grid-column:1/-1}
  .section-head__meta{margin-left:0;width:100%}
  .index-row{grid-template-columns:40px minmax(0,1fr);gap:12px}
  .index-row__meta{grid-column:2;text-align:left}
}

/* ============ 11. motion & a11y ============ */
html.has-js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .22s ease-out,transform .22s ease-out}
html.has-js [data-reveal].is-in{opacity:1;transform:translateY(0)}

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