/* ===== 0. reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
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}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ===== 1. tokens ===== */
:root{
  --ink:#0A0E12;
  --paper:#F5F7F2;
  --ice:#0B3C5D;
  --aurora:#3DDC97;
  --ember:#FF7A00;
  --mid:#1F6E8C;
  --frost:#B9C6CE;
  --chalk:#6B7A82;
  --deep:#06202F;
  --signal:#E5484D;
  --line:rgba(185,198,206,.55);
  --line-soft:rgba(185,198,206,.28);
  --shell:1240px;
  --gutter:clamp(18px,4vw,48px);
  --header-h:78px;
  --font-display:"Archivo Black","Impact","Haettenschweiler","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --shadow-plate:6px 6px 0 rgba(11,60,93,.1);
}
@media (max-width:760px){:root{--header-h:64px}}

/* ===== 2. base ===== */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:clamp(15px,1.02vw,17px);
  font-weight:400;
  line-height:1.8;
  letter-spacing:.01em;
  padding-top:var(--header-h);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.06;letter-spacing:-.015em}
p{text-wrap:pretty}
strong{font-weight:700}
::selection{background:var(--aurora);color:var(--deep)}
:focus-visible{outline:3px solid var(--aurora);outline-offset:2px}
#main-content:focus{outline:none}
.skip-link{
  position:fixed;top:-72px;left:16px;z-index:200;
  padding:10px 18px;background:var(--aurora);color:var(--deep);
  font-weight:700;font-size:14px;border-radius:2px;
  transition:top .22s ease;
}
.skip-link:focus{top:14px}

/* ===== 3. layout ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.shell--narrow{max-width:860px}
.shell--wide{max-width:1480px}
.section{padding:clamp(48px,7vw,104px) 0}
.section--tight{padding:clamp(30px,4vw,56px) 0}
.section--ice{background:var(--ice);color:var(--paper)}
.section--deep{background:var(--deep);color:var(--paper)}
.grid,.grid-2,.grid-3,.grid-4{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--aside{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,340px);gap:clamp(22px,3.4vw,54px);align-items:start}
.stack{display:grid;gap:14px}
.hairline{height:1px;background:var(--line);border:0;margin:clamp(24px,3vw,42px) 0}
.hero-bleed{margin-top:calc(var(--header-h) * -1)}

/* ===== 4. typography helpers ===== */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--mid);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--ember);flex:0 0 auto}
.section-title{font-size:clamp(26px,4vw,46px);line-height:1.04;letter-spacing:-.01em}
.section-lead{margin-top:14px;max-width:46em;color:var(--chalk);font-size:clamp(15px,1.15vw,17px)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.76;color:var(--ink)}

/* ===== 5. buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:700;letter-spacing:.05em;line-height:1.3;
  text-align:center;transition:transform .2s ease,background-color .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-ember{background:var(--ember);color:#241000;box-shadow:3px 3px 0 rgba(255,122,0,.28)}
.btn-ember:hover{background:#ff8d26;box-shadow:5px 5px 0 rgba(255,122,0,.32)}
.btn-aurora{background:var(--aurora);color:var(--deep);box-shadow:3px 3px 0 rgba(61,220,151,.24)}
.btn-aurora:hover{background:#5ae5a9}
.btn-ice{background:var(--ice);color:var(--paper)}
.btn-ice:hover{background:var(--mid)}
.btn-ghost{background:transparent;color:var(--paper);border-color:rgba(185,198,206,.5)}
.btn-ghost:hover{border-color:var(--aurora);color:var(--aurora)}
.btn-block{width:100%}

/* ===== 6. tags / notes / cards ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  border:1px solid var(--frost);color:var(--mid);background:rgba(245,247,242,.7);
}
.tag-aurora{border-color:rgba(61,220,151,.55);color:#0f6b4a;background:rgba(61,220,151,.14)}
.tag-ember{border-color:rgba(255,122,0,.55);color:#8f4300;background:rgba(255,122,0,.12)}
.tag-frost{border-color:var(--frost);color:var(--chalk);background:transparent}
.note{border-left:3px solid var(--aurora);background:rgba(61,220,151,.09);padding:16px 18px}
.note-label{display:block;margin-bottom:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:#0f6b4a}
.card{
  position:relative;background:var(--paper);border:1px solid var(--frost);
  padding:clamp(18px,2vw,26px);box-shadow:var(--shadow-plate);
  transition:transform .3s ease,box-shadow .3s ease;
}
.card:hover{transform:translate(-2px,-2px);box-shadow:10px 10px 0 rgba(11,60,93,.13)}
.card-title{font-size:clamp(18px,1.6vw,22px);line-height:1.2}
.card-text{margin-top:10px;color:var(--chalk);font-size:14.5px}
.card-meta{margin-top:16px;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--mid)}

/* ===== 7. directory index ===== */
.index-list{border-top:1px solid var(--line)}
.index-row{
  display:grid;grid-template-columns:56px minmax(0,1fr) auto;
  gap:clamp(12px,2vw,24px);align-items:baseline;
  padding:14px 4px;border-bottom:1px solid var(--line-soft);
  transition:background-color .25s ease,padding-left .25s ease;
}
.index-row:hover{background:rgba(11,60,93,.05);padding-left:12px}
.index-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice)}
.index-label{font-weight:700}
.index-value{font-family:var(--font-mono);font-size:15px;color:var(--ember)}

/* ===== 8. data blocks ===== */
.stat{display:grid;gap:6px}
.stat-value{font-family:var(--font-mono);font-size:clamp(28px,4vw,44px);line-height:1;letter-spacing:-.02em;color:var(--ice)}
.stat-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--chalk)}
.meter{height:8px;background:rgba(11,60,93,.12);overflow:hidden}
.meter-fill{display:block;height:100%;width:var(--meter-value,0%);background:linear-gradient(90deg,var(--aurora),var(--ember));transition:width .8s ease}

/* ===== 9. tabs ===== */
.tabs{display:grid}
.tab-list{display:flex;gap:6px;overflow-x:auto;border-bottom:1px solid var(--line);scrollbar-width:thin}
.tab{
  flex:0 0 auto;padding:12px 18px;font-size:14px;font-weight:700;letter-spacing:.06em;
  color:var(--chalk);background:transparent;border:1px solid transparent;border-bottom:none;
  transition:color .22s ease,background-color .22s ease;
}
.tab:hover{color:var(--ice)}
.tab[aria-selected="true"]{color:var(--ice);background:var(--paper);border-color:var(--line);box-shadow:inset 0 3px 0 var(--aurora)}
.tab-panel{padding:clamp(18px,2.4vw,30px) 0}
.tab-panel[hidden]{display:none}

/* ===== 10. media frames ===== */
.media-frame{
  position:relative;display:block;overflow:hidden;
  background:linear-gradient(135deg,var(--deep) 0%,var(--ice) 55%,var(--mid) 100%);
  border:1px solid var(--line);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:1;
  background-image:linear-gradient(rgba(245,247,242,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(245,247,242,.07) 1px,transparent 1px);
  background-size:38px 38px;
}
.media-fill{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.media-caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:8px 12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(245,247,242,.8);background:rgba(6,32,47,.72);border-top:1px solid rgba(185,198,206,.28);
}
.media-ratio-16x9{aspect-ratio:16/9}
.media-ratio-4x3{aspect-ratio:4/3}
.media-ratio-1x1{aspect-ratio:1/1}

/* ===== 11. breadcrumb ===== */
.breadcrumb{margin-bottom:clamp(18px,2.4vw,30px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--chalk)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item:not(:last-child)::after{content:"/";color:var(--frost)}
.breadcrumb-item a{color:var(--mid);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.breadcrumb-item a:hover{color:var(--ember);border-color:var(--ember)}
.breadcrumb-item[aria-current="page"]{color:var(--ink)}

/* ===== 12. header ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  color:var(--paper);
  background:linear-gradient(180deg,rgba(6,32,47,.94) 0%,rgba(6,32,47,.6) 60%,rgba(6,32,47,0) 100%);
  transition:background-color .35s ease,box-shadow .35s ease;
}
.site-header.is-solid{
  background:var(--ice);
  box-shadow:0 12px 30px rgba(10,14,18,.34);
  backdrop-filter:saturate(140%) blur(6px);
}
.header-rail{position:relative;border-bottom:1px solid rgba(245,247,242,.14)}
.site-header.is-solid .header-rail{border-bottom-color:rgba(61,220,151,.32)}
.header-inner{
  display:flex;align-items:center;gap:clamp(14px,2.6vw,38px);
  width:100%;max-width:1480px;margin-inline:auto;
  padding:0 var(--gutter);min-height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  display:grid;place-items:center;width:38px;height:38px;flex:0 0 auto;
  background:var(--aurora);color:var(--deep);border-radius:2px;
  font-family:var(--font-display);font-size:20px;line-height:1;
  box-shadow:4px 4px 0 rgba(61,220,151,.22);
}
.brand-text{display:flex;flex-direction:column;line-height:1.16}
.brand-name{font-family:var(--font-display);font-size:17px;letter-spacing:.01em}
.brand-line{font-size:11px;letter-spacing:.16em;color:rgba(245,247,242,.66)}
.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.5vw,26px)}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-block;padding:10px 2px;
  font-size:14px;font-weight:600;letter-spacing:.06em;color:rgba(245,247,242,.82);
  transition:color .25s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:4px;height:2px;
  background:var(--aurora);transform:scaleX(0);transform-origin:left;
  transition:transform .3s ease;
}
.nav-link:hover{color:var(--paper)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--aurora)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.header-cta{padding:10px 16px;font-size:13px}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid rgba(245,247,242,.4);border-radius:2px;
  color:var(--paper);font-size:12px;letter-spacing:.14em;
  transition:border-color .25s ease,color .25s ease;
}
.nav-toggle:hover{border-color:var(--aurora);color:var(--aurora)}
.nav-toggle-icon{display:grid;gap:4px;width:16px}
.nav-toggle-bar{display:block;width:16px;height:2px;background:var(--aurora);transition:transform .28s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}
.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;opacity:0;transition:opacity .3s ease}
.site-header.is-solid .scroll-meter{opacity:1}
.scroll-meter-fill{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--aurora),var(--ember));
  transform:scaleX(0);transform-origin:left;
}

/* ===== 13. footer ===== */
.site-footer{position:relative;background:var(--deep);color:var(--paper);margin-top:clamp(56px,8vw,120px);overflow:hidden}
.footer-edge{height:4px;background:linear-gradient(90deg,var(--aurora) 0%,var(--mid) 52%,var(--ember) 100%)}
.footer-inner{width:100%;max-width:1480px;margin-inline:auto;padding:clamp(38px,6vw,72px) var(--gutter) clamp(22px,3vw,34px)}
.footer-ledger{
  display:grid;grid-template-columns:1.1fr 1.6fr 1.2fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(26px,4vw,48px);
  border-bottom:1px solid rgba(185,198,206,.2);
}
.footer-kicker{font-family:var(--font-display);font-size:clamp(22px,2.4vw,30px);line-height:1.1}
.footer-slogan{margin-top:8px;font-size:13px;letter-spacing:.24em;color:var(--aurora)}
.footer-note{margin-top:16px;max-width:34em;font-size:14px;color:rgba(245,247,242,.7)}
.footer-index{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2.5vw,34px)}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid rgba(185,198,206,.24);
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.2em;color:var(--frost);
}
.footer-list{display:grid;gap:10px}
.footer-link{font-size:14px;color:rgba(245,247,242,.84);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.footer-link:hover{color:var(--aurora);border-color:var(--aurora)}
.footer-contact{min-width:0}
.contact-list{display:grid;gap:12px}
.contact-row{display:grid;gap:2px}
.contact-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--frost)}
.contact-value{font-size:14px;color:var(--paper);word-break:break-word}
.contact-note{margin-top:14px;font-size:13px;line-height:1.7;color:rgba(245,247,242,.62)}
.footer-cta{margin-top:18px}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  padding-top:22px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(245,247,242,.6);
}
.footer-icp{color:rgba(245,247,242,.72)}
.footer-legal-link{color:rgba(245,247,242,.72);border-bottom:1px solid rgba(185,198,206,.4);transition:color .2s ease,border-color .2s ease}
.footer-legal-link:hover{color:var(--aurora);border-color:var(--aurora)}
.footer-copy{margin-left:auto}

/* ===== 14. motion ===== */
[data-reveal]{opacity:1}
.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.js [data-reveal].is-in{opacity:1;transform: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 [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover{transform:none}
}

/* ===== 15. responsive ===== */
@media (max-width:1100px){
  .grid--aside{grid-template-columns:minmax(0,1fr)}
  .footer-ledger{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:960px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .header-inner{gap:12px}
  .brand-line{display:none}
  .header-cta{padding:9px 12px;font-size:12px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;left:12px;right:12px;bottom:12px;z-index:95;
    margin-left:0;padding:14px 14px 18px;
    background:var(--deep);border:1px solid rgba(61,220,151,.32);border-radius:14px;
    box-shadow:0 22px 50px rgba(10,14,18,.5);
    max-height:76vh;overflow-y:auto;
    transform:translateY(calc(100% + 28px));opacity:0;visibility:hidden;
    transition:transform .38s cubic-bezier(.22,.9,.24,1),opacity .3s ease,visibility .3s ease;
  }
  .primary-nav[data-open]{transform:translateY(0);opacity:1;visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    display:flex;align-items:center;justify-content:space-between;
    padding:13px 6px;font-size:16px;
    border-bottom:1px solid rgba(185,198,206,.16);color:rgba(245,247,242,.9);
  }
  .nav-link::after{display:none}
  .nav-link::before{content:"→";order:2;color:var(--aurora);font-family:var(--font-mono);font-size:13px}
  .nav-link[aria-current="page"]{color:var(--aurora)}
}
@media (max-width:760px){
  .footer-ledger{grid-template-columns:1fr}
  .footer-index{grid-template-columns:1fr 1fr}
  .footer-copy{margin-left:0}
  .footer-legal{font-size:11px;gap:8px 16px}
}
@media (max-width:600px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .index-row{grid-template-columns:38px minmax(0,1fr) auto;padding:12px 2px}
  .footer-index{grid-template-columns:1fr}
  .tab{padding:10px 14px;font-size:13px}
}
@media (max-width:400px){
  .header-cta{display:none}
}