:root{
  --bg:#1a1d25;--bg2:#20242e;--card:#272c37;--line:rgba(255,255,255,.1);
  --tx:#eef0f3;--tx2:#b7bcc7;--mute:#7f8694;
  --gold:#e8b84a;--gold2:#c9972c;--ice:#9fb7d9;--red:#d96b6b;
  --paper:#f4f1ea;--ink:#1a1a1a;
  --r:16px;--sh:0 18px 50px rgba(0,0,0,.45);
  --font:"Noto Sans KR",system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;
  --pen:"Nanum Pen Script",cursive;
  --hand:"Gaegu","Noto Sans KR",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--tx);line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{width:min(1100px,100% - 32px);margin-inline:auto}
.bg{position:fixed;inset:0;z-index:-1;background:
  radial-gradient(900px 500px at 15% -10%,rgba(159,183,217,.12),transparent 60%),
  radial-gradient(700px 400px at 100% 20%,rgba(232,184,74,.08),transparent 60%),
  linear-gradient(180deg,#181b22,#1d212a 40%,#181b22)}

/* header */
.hdr{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:rgba(26,29,37,.78);border-bottom:1px solid var(--line)}
.hdr-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:60px}
.logo{display:flex;flex-direction:column;line-height:1.15}
.logo b{font-weight:900;letter-spacing:-.02em;font-size:17px}
.logo small{color:var(--mute);font-size:11px;letter-spacing:.02em}
.nav{display:flex;gap:4px}
.nav a{padding:8px 12px;border-radius:999px;font-size:14px;color:var(--tx2);white-space:nowrap}
.nav a:hover{background:rgba(255,255,255,.06);color:var(--tx)}
@media (max-width:640px){.nav{overflow-x:auto;scrollbar-width:none;flex:none}.nav::-webkit-scrollbar{display:none}.nav a{padding:8px 9px;font-size:13px}.logo{flex:none}.logo b{font-size:15px;white-space:nowrap}.logo small{display:none}}

/* hero */
.hero{padding:clamp(40px,8vw,96px) 0 clamp(40px,7vw,80px)}
.hero-in{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:clamp(24px,5vw,64px);align-items:center}
@media (max-width:860px){.hero-in{grid-template-columns:minmax(0,1fr)}}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--gold);margin-bottom:14px}
h1{font-size:clamp(30px,5vw,52px);font-weight:900;letter-spacing:-.03em;line-height:1.18}
h1 em{font-style:normal;color:var(--ice)}
.lead{margin-top:18px;color:var(--tx2);font-size:clamp(15px,1.6vw,18px);max-width:52ch}
.cta{display:flex;gap:10px;margin-top:26px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 20px;border-radius:999px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:transform .15s,background .2s}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--gold);color:#1a1405}
.btn.primary:hover{background:#f2c65c}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--tx)}
.btn.ghost:hover{background:rgba(255,255,255,.06)}
.btn.big{padding:16px 30px;font-size:17px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}
.chips li{font-size:12px;padding:6px 11px;border-radius:999px;border:1px solid var(--line);color:var(--tx2);background:rgba(255,255,255,.03)}

/* id card */
.idwrap{display:flex;flex-direction:column;align-items:center;gap:12px;perspective:1400px}
.idcard{position:relative;width:min(420px,100%);aspect-ratio:1.586;cursor:pointer;transform-style:preserve-3d;transition:transform .7s cubic-bezier(.2,.8,.2,1);outline:none}
.idcard.flipped{transform:rotateY(180deg)}
.idcard:focus-visible{box-shadow:0 0 0 3px rgba(232,184,74,.5);border-radius:18px}
.face{position:absolute;inset:0;border-radius:18px;backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:var(--sh);overflow:hidden}
.front{background:linear-gradient(135deg,#f7f5ef,#e9e4d8);color:var(--ink);display:flex;flex-direction:column;padding:16px 18px}
.front::before{content:"";position:absolute;inset:0;background:
  repeating-linear-gradient(135deg,rgba(0,0,0,.025) 0 2px,transparent 2px 10px);pointer-events:none}
.id-top{display:flex;justify-content:space-between;align-items:baseline;border-bottom:2px solid #2a2e3a;padding-bottom:8px}
.univ{font-weight:900;font-size:15px;letter-spacing:-.01em}
.univ small{font-weight:500;color:#5b6170;font-size:10px;margin-left:6px;letter-spacing:.08em}
.kind{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:#5b6170}
.id-body{display:grid;grid-template-columns:98px minmax(0,1fr);gap:14px;padding:12px 0 8px;flex:1}
.photo{position:relative;background:#cfd3dc;border-radius:6px;overflow:hidden;aspect-ratio:3/4;align-self:start}
.photo img{width:100%;height:100%;object-fit:cover;object-position:80% 20%}
.photo .nophoto-txt{display:none;position:absolute;inset:0;place-items:center;font-family:var(--mono);font-size:11px;color:#5b6170;letter-spacing:.1em}
.photo.nophoto img{display:none}.photo.nophoto .nophoto-txt{display:grid}
.fields{display:flex;flex-direction:column;gap:5px;font-size:12px}
.fields div{display:grid;grid-template-columns:34px minmax(0,1fr);gap:8px;align-items:baseline}
.fields dt{color:#6b7180;font-size:10px;letter-spacing:.08em}
.fields dd{font-weight:500}
.fields .name{font-size:20px;font-weight:900;letter-spacing:.02em}
.id-bot{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#5b6170}
.mono{font-family:var(--mono);letter-spacing:.08em}
.stamp{font-family:var(--pen);font-size:18px;color:var(--red);transform:rotate(-6deg);border:2px solid var(--red);padding:0 8px;border-radius:4px;opacity:.85}
.back{background:linear-gradient(135deg,#ece8de,#dcd6c8);color:var(--ink);transform:rotateY(180deg);display:flex;flex-direction:column}
.strip{height:40px;background:#23262f;margin-top:18px}
.back-body{padding:12px 18px 0;flex:1}
.back-h{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:#5b6170;margin-bottom:6px}
.back-list{font-size:12.5px;line-height:1.55}
.back-list li::before{content:"· ";color:#6b7180}
.back-note{font-size:10px;color:#7b8190;margin-top:8px}
.barcode{height:34px;margin:8px 18px 14px;background:
  repeating-linear-gradient(90deg,#1a1a1a 0 2px,transparent 2px 4px,#1a1a1a 4px 5px,transparent 5px 9px,#1a1a1a 9px 12px,transparent 12px 14px)}
.idhint{font-size:12px;color:var(--mute)}
@media (max-width:420px){.id-body{grid-template-columns:80px minmax(0,1fr)}.fields .name{font-size:17px}}

/* sections */
.sec{padding:clamp(48px,8vw,96px) 0}
.sec.alt{background:rgba(255,255,255,.035);border-block:1px solid var(--line)}
.sec-h{margin-bottom:clamp(24px,4vw,40px)}
h2{font-size:clamp(24px,3.4vw,36px);font-weight:900;letter-spacing:-.02em}
.sub{color:var(--tx2);margin-top:8px;max-width:60ch}
h3{font-size:16px;font-weight:700;margin-bottom:8px;color:var(--gold)}

/* voices */
.voice-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}
.voice{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 16px}
.who{display:flex;gap:10px;align-items:center;margin-bottom:10px}
.av{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:rgba(159,183,217,.15);color:var(--ice);font-weight:900;flex:none}
.who b{display:block;font-size:14px}
.who small{color:var(--mute);font-size:12px}
.voice p{color:var(--tx2);font-size:14.5px}

/* chat */
.chat{max-width:560px;margin-inline:auto;background:#b2c7d9;border-radius:18px;padding:14px 14px 18px;color:#1a1a1a;box-shadow:var(--sh)}
.chat-head{display:flex;gap:8px;align-items:baseline;font-size:14px;padding:0 4px 10px;border-bottom:1px solid rgba(0,0,0,.08);margin-bottom:12px}
.chat-head span{color:#5b6b7a;font-size:12px}
.msg{display:flex;flex-direction:column;align-items:flex-start;margin:7px 0}
.msg .n{font-size:11px;color:#3f4b58;margin:0 0 3px 6px}
.msg .b{background:#fff;padding:8px 12px;border-radius:4px 14px 14px 14px;font-size:14px;max-width:80%}
.msg.me{align-items:flex-end}
.msg.me .n{margin:0 6px 3px 0}
.msg.me .b{background:#fde86a;border-radius:14px 4px 14px 14px}
.chat-foot{text-align:center;color:var(--mute);font-size:12.5px;margin-top:14px}

/* notes */
.notes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.note{background:var(--paper);color:var(--ink);border-radius:6px;padding:18px 18px 16px;box-shadow:var(--sh);position:relative;transform:rotate(-.4deg)}
.note:nth-child(2n){transform:rotate(.5deg)}
.note::before{content:"";position:absolute;top:-8px;left:50%;width:70px;height:18px;background:rgba(232,184,74,.55);transform:translateX(-50%) rotate(-2deg)}
.note h3{font-family:var(--hand);font-weight:700;font-size:22px;color:#2a2e3a;margin-bottom:6px}
.note li{font-family:var(--hand);font-weight:700;font-size:16.5px;line-height:1.5;color:#2a2e3a;padding-left:14px;text-indent:-14px}
.note li::before{content:"- "}
.tease{margin-top:28px;border:1px dashed rgba(232,184,74,.5);border-radius:var(--r);padding:20px 22px;background:rgba(232,184,74,.05)}
.tease-h{font-weight:900;font-size:17px;color:var(--gold);margin-bottom:4px}
.tease p:last-child{color:var(--tx2)}

/* play */
.play-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px}
.pcard p{color:var(--tx2);font-size:14.5px}
.pcard code{font-family:var(--mono);background:rgba(255,255,255,.08);padding:1px 6px;border-radius:6px;color:var(--tx);font-size:13px}
.pcard.warn{border-color:rgba(217,107,107,.45);background:rgba(217,107,107,.06)}
.pcard.warn h3{color:var(--red)}
.final{text-align:center;margin-top:clamp(36px,6vw,64px);padding:clamp(28px,5vw,48px) 20px;border-radius:24px;background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.01));border:1px solid var(--line)}
.final-q{font-size:clamp(26px,4vw,40px);font-weight:900;letter-spacing:-.02em;color:var(--ice)}
.final-a{color:var(--tx2);margin:6px 0 22px}
.final-note{color:var(--mute);font-size:12px;margin-top:12px}

/* footer */
.ftr{border-top:1px solid var(--line);padding:22px 0 40px;color:var(--mute);font-size:12px}
.ftr-in{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}

@media (prefers-reduced-motion:reduce){.idcard{transition:none}html{scroll-behavior:auto}}

/* fine print */
.fine{margin-top:10px;padding:10px 12px;border-left:3px solid var(--gold);background:rgba(232,184,74,.07);border-radius:6px;font-size:13.5px;color:var(--tx2)}

/* ===== 인트로: 학사정보 포털 ===== */
.portal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;background:#0e1014;transition:opacity .45s,visibility .45s}
.portal.hide{opacity:0;visibility:hidden;pointer-events:none}
.portal-win{width:min(520px,100% - 32px);background:#f3f4f6;color:#1a1d25;border-radius:12px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.6);font-family:var(--font);position:relative}
.portal-bar{display:flex;align-items:center;gap:6px;background:#dfe2e8;padding:9px 12px}
.portal-bar .dot{width:10px;height:10px;border-radius:50%;background:#c3c8d1}
.portal-url{margin-left:8px;font-family:var(--mono);font-size:11px;color:#5b6170;background:#fff;padding:3px 10px;border-radius:999px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.portal-body{padding:18px 20px 22px}
.portal-h{font-size:15px;border-bottom:2px solid #2a3b6b;padding-bottom:8px;margin-bottom:14px;color:#2a3b6b}
.portal-h b{font-weight:900}.portal-h small{display:block;color:#6b7180;font-size:11px;font-weight:400;margin-top:2px}
.portal-field{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid #cfd3dc;border-radius:6px;padding:9px 12px;margin-bottom:8px;font-size:14px;position:relative}
.portal-field span{width:34px;color:#6b7180;font-size:12px;flex:none}
.portal-field i{font-style:normal;font-weight:700;min-height:1.2em}
.caret{width:2px;height:16px;background:#2a3b6b;display:inline-block;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.portal-status{font-family:var(--mono);font-size:12px;color:#5b6170;margin:12px 0 6px}
.portal-prog{height:6px;background:#dfe2e8;border-radius:999px;overflow:hidden}
.portal-prog i{display:block;height:100%;width:0;background:#2a3b6b;transition:width .4s}
.portal-res{display:none;margin-top:14px;border-top:1px dashed #cfd3dc;padding-top:10px;font-size:13px}
.portal-res div{display:flex;justify-content:space-between;padding:4px 0}
.portal-res span{color:#6b7180}
.portal.done .portal-res{display:block}
.portal-skip{position:absolute;right:12px;bottom:10px;background:#fff;border:1px solid #cfd3dc;border-radius:999px;color:#5b6170;font-size:12px;cursor:pointer;font-family:inherit;padding:5px 12px}
.portal-body{padding-bottom:44px}
@media (prefers-reduced-motion:reduce){.portal{display:none}}

/* ===== 모바일 최적화 ===== */
.mnav{display:none}
@media (max-width:760px){
  .wrap{width:min(1100px,100% - 28px)}
  .hdr .nav{display:none}
  .hdr-in{height:52px}
  .logo b{font-size:16px}
  body{padding-bottom:calc(64px + env(safe-area-inset-bottom))}
  .mnav{position:fixed;left:0;right:0;bottom:0;z-index:60;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));background:rgba(26,29,37,.92);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
  .mnav a{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11px;color:var(--tx2);padding:6px 0;border-radius:10px}
  .mnav a svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .mnav a.go{color:#1a1405;background:var(--gold);margin:-10px 4px 0;padding:10px 0 8px;border-radius:14px;font-weight:900;box-shadow:0 8px 20px rgba(232,184,74,.35)}
  .mnav a.on{color:var(--tx);background:rgba(255,255,255,.08)}
  .hero{padding:28px 0 36px}
  .hero-in{gap:26px}
  .hero-txt{order:2}.idwrap{order:1}
  h1{font-size:30px}
  .lead{font-size:15px}
  .cta{gap:8px}
  .btn{padding:13px 16px;font-size:15px;flex:1 1 auto;min-height:46px}
  .btn#flipBtn{display:none}
  .idhint{display:none}
  .sec{padding:44px 0}
  h2{font-size:26px}
  .voice,.pcard{padding:16px}
  .voice p,.pcard p{font-size:15px;line-height:1.7}
  .chat{padding:12px 10px 16px;border-radius:14px}
  .msg .b{max-width:88%;font-size:15px;padding:9px 12px}
  .notes-grid{grid-template-columns:minmax(0,1fr);gap:16px}
  .note{transform:none}
  .note li{font-size:17px}
  .final{padding:30px 16px;border-radius:18px}
  .final .btn.big{width:100%}
  .ftr{padding-bottom:28px}
}
@media (max-width:380px){
  h1{font-size:27px}
  .chips li{font-size:11px}
}

.portal-go{display:block;width:100%;margin:10px 0 4px;padding:11px;border:0;border-radius:8px;background:#2a3b6b;color:#fff;font-weight:700;font-size:14px;font-family:inherit;cursor:pointer;transition:opacity .2s}
.portal-go:disabled{opacity:.35;cursor:default}
.portal-go:not(:disabled):hover{background:#344a85}
.caret[hidden]{display:none}