/* WTF Academy — the visual language of WTF Studio: warm dark paper, a hairline grid, flat frosted glass, one blue. */
/* the wordmark's serif (as on the UCTF explainer): Source Serif 4, Latin subset, SIL OFL (fonts/OFL.txt) */
@font-face{font-family:"Source Serif 4";src:url("fonts/SourceSerif4-latin.woff2") format("woff2");font-weight:200 900;font-display:swap}
:root{
  --S:"Source Serif 4","Noto Serif SC","Songti SC",Georgia,serif;
  --paper:#141413; --ink:#faf9f5; --ink-2:#e8e6dc; --muted:#b0aea5;
  --line:rgba(176,174,165,.34); --line-2:rgba(176,174,165,.16);
  --signal:#4c9dff; --signal-soft:rgba(76,157,255,.32); --signal-wash:rgba(76,157,255,.14);
  --glass:rgba(250,249,245,.045); --glass-edge:rgba(250,249,245,.09);
  --minor:rgba(250,249,245,.035); --major:rgba(250,249,245,.07);
  --R:"MiSans","PingFang SC","Microsoft YaHei UI","Segoe UI",system-ui,sans-serif;
  --D:"MiSans Demibold","MiSans","PingFang SC","Microsoft YaHei UI","Segoe UI",system-ui,sans-serif;
  --M:"Cascadia Mono","JetBrains Mono",Consolas,ui-monospace,monospace;
  --spring:cubic-bezier(.34,1.42,.5,1); --ease:cubic-bezier(.22,1,.36,1);
}
*{box-sizing:border-box}
html{background:var(--paper)}
body{margin:0;min-height:100vh;background:transparent;color:var(--ink);font-family:var(--R);
  font-synthesis:none;-webkit-font-smoothing:antialiased;line-height:1.6;overflow-x:hidden}
a{color:inherit}
.grid{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(to right,var(--major) 1px,transparent 1px),
    linear-gradient(to bottom,var(--major) 1px,transparent 1px),
    linear-gradient(to right,var(--minor) 1px,transparent 1px),
    linear-gradient(to bottom,var(--minor) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;background-position:-1px -1px}

.top{max-width:1120px;margin:0 auto;padding:28px 24px 0;display:flex;align-items:center;justify-content:space-between}
.brand{display:grid;gap:7px;text-decoration:none;user-select:none}
.brand .mark{font-family:var(--S);font-weight:600;font-size:32px;letter-spacing:.3em;line-height:.9;margin-right:-.3em}
.brand .sub{font-family:var(--S);font-size:13px;letter-spacing:.06em;color:var(--muted)}
.lang{font:inherit;font-size:13px;color:var(--ink-2);background:var(--glass);border:1px solid var(--glass-edge);
  border-radius:999px;padding:6px 14px;cursor:pointer;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:border-color .2s,transform .35s var(--spring)}
.lang:hover{border-color:var(--signal-soft)}
.lang:active{transform:scale(.95)}

main{max-width:1120px;margin:0 auto;padding:0 24px}
.hero{padding:11vh 0 6vh;max-width:880px}
.eyebrow{margin:0 0 18px;font-family:var(--M);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--signal)}
h1{margin:0;font-family:var(--D);font-weight:400;font-size:clamp(34px,6vw,64px);line-height:1.08;letter-spacing:-.01em;min-height:2.2em}
.caret{display:inline-block;width:.06em;height:.9em;margin-left:.08em;vertical-align:-.08em;background:var(--signal);
  animation:blink 1.05s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.lede{margin:26px 0 0;max-width:640px;font-size:clamp(16px,1.6vw,18px);color:var(--ink-2)}

.receipts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin:0 0 7vh;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.receipts div{padding:18px 18px 16px;border-left:1px solid var(--line-2)}
.receipts div:first-child{border-left:0;padding-left:0}
.receipts b{display:block;font-family:var(--D);font-weight:400;font-size:clamp(26px,3.4vw,40px);line-height:1.1;color:var(--ink)}
.receipts span{display:block;margin-top:6px;font-size:13px;color:var(--muted)}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;padding-bottom:12vh}
.card{position:relative;display:flex;flex-direction:column;padding:28px 26px 24px;border-radius:20px;
  background:var(--glass);border:1px solid var(--glass-edge);
  backdrop-filter:blur(18px) saturate(1.15);-webkit-backdrop-filter:blur(18px) saturate(1.15);
  opacity:0;transform:translateY(18px);transition:border-color .25s,transform .6s var(--spring),opacity .6s var(--ease)}
.card.in{opacity:1;transform:none}
.card:hover{border-color:var(--signal-soft)}
.tick{font-family:var(--M);font-size:11px;color:var(--signal);padding-bottom:14px;margin-bottom:16px;border-bottom:1px solid var(--line-2)}
.card h2{margin:0 0 10px;font-family:var(--D);font-weight:400;font-size:21px;line-height:1.3}
.card p{margin:0 0 14px;color:var(--ink-2);font-size:15px}
.card .meta{margin-top:auto;padding-top:6px;font-family:var(--M);font-size:12px;color:var(--muted);overflow-wrap:anywhere}
.card .meta b{font-weight:400;color:var(--ink)}
.contact{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:auto 0 4px;padding-top:6px;font-size:13px}
.contact dt{color:var(--muted)}
.contact dd{margin:0;font-family:var(--M);font-size:12px;overflow-wrap:anywhere;align-self:center}
.mail{text-decoration:none;color:var(--ink)}
.mail:hover{color:var(--signal)}
.btn{display:inline-flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px;padding:11px 16px;
  border-radius:12px;border:1px solid var(--line);text-decoration:none;font-size:15px;color:var(--ink);
  transition:background .2s,border-color .2s,transform .35s var(--spring)}
.btn i{font-style:normal;transition:transform .35s var(--spring)}
.btn:hover{border-color:var(--signal);background:var(--signal-wash)}
.btn:hover i{transform:translateX(4px)}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--signal);border-color:var(--signal);color:#0b1626}
.btn.primary:hover{background:#68adff}
.btn:focus-visible,.lang:focus-visible,a:focus-visible{outline:2px solid var(--signal);outline-offset:3px}

footer{max-width:1120px;margin:0 auto;padding:28px 24px 40px;border-top:1px solid var(--line-2);font-size:13px;color:var(--muted)}
footer a{text-decoration:none}
footer a:hover{color:var(--ink)}
footer .dot{margin:0 8px}
.fine{margin:10px 0 0;font-size:12px;max-width:720px}

@media (max-width:860px){
  .cards{grid-template-columns:1fr}
  .receipts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .receipts div:nth-child(3){border-left:0;padding-left:0}
  .hero{padding:9vh 0 6vh}
}
@media (max-width:480px){
  .top,main,footer{padding-left:16px;padding-right:16px}
  .card{padding:22px 18px 20px}
}
@media (prefers-reduced-motion:reduce){
  .card{opacity:1;transform:none;transition:none}
  .caret{animation:none}
}