:root{
  color-scheme:light;
  --bg:#fbfbf9;
  --card:#fff;
  --ink:#111318;
  --ink-2:#535966;
  --line:#dedfdc;
  --line-soft:#ecece8;
  --accent:#1f5eff;
  --accent-soft:#eaf0ff;
  --ok:#2d6944;
  --ok-bg:#e7f6ec;
  --review:#6f4a10;
  --review-bg:#fff2d9;
  font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit}
.page{width:min(1080px,calc(100% - 48px));margin:0 auto;padding:28px 0 80px}
.back{min-height:44px;display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:750;text-decoration:none}
.back:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.hero{padding:64px 0 42px;border-bottom:1px solid var(--line)}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--accent)}
.title-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:14px}
h1{margin:0;font-size:clamp(40px,7vw,72px);line-height:1.05;letter-spacing:-.05em}
.status{display:inline-flex;align-items:center;min-height:30px;padding:5px 11px;border-radius:999px;
  color:var(--ok);background:var(--ok-bg);font-size:12px;font-weight:800}
.status.static{color:var(--review);background:var(--review-bg)}
.summary{max-width:730px;margin:20px 0 0;color:var(--ink-2);font-size:18px}
.proof{padding:52px 0}
.proof h2,.implementation h2{margin:0 0 22px;font-size:26px;letter-spacing:-.03em}
.proof-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.proof-card{padding:24px;border:1px solid var(--line-soft);border-radius:16px;background:var(--card)}
.proof-card h3{margin:0 0 8px;font-size:13px;color:var(--accent);letter-spacing:.04em}
.proof-card p{margin:0;color:var(--ink-2)}
.evidence{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
.evidence a,.actions a{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;
  border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:13px;font-weight:800;background:var(--card)}
.evidence a:first-child,.actions .primary{background:var(--ink);border-color:var(--ink);color:#fff}
.evidence a:hover,.actions a:hover{border-color:var(--accent);color:var(--accent)}
.evidence a:first-child:hover,.actions .primary:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.recovery{padding:18px 20px;border:1px solid #e6cc98;border-radius:14px;background:#fff8e8;color:#63491c}
.recovery p{margin:0}
.recovery a{font-weight:800}
.implementation{padding:52px 0 0}
details{border:1px solid var(--line);border-radius:16px;background:var(--card);overflow:hidden}
summary{min-height:56px;padding:0 20px;display:flex;align-items:center;cursor:pointer;font-weight:800}
.detail-body{padding:0 20px 22px;color:var(--ink-2)}
.detail-body ul{margin:0;padding-left:20px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.boundary{margin:20px 0 0;padding:16px 18px;border-left:4px solid var(--accent);background:var(--accent-soft);color:var(--ink-2);border-radius:0 12px 12px 0}
.chain{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr);gap:12px;align-items:stretch}
.chain article{display:flex;flex-direction:column;gap:8px;padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.chain article span{font-size:12px;font-weight:800;letter-spacing:.04em;color:var(--accent)}
.chain article strong,.chain article a,.chain article time{font-size:15px;overflow-wrap:anywhere}
.chain-arrow{display:grid;place-items:center;color:var(--accent);font-weight:900}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:16px;background:var(--card);margin-bottom:20px}
table{width:100%;min-width:680px;border-collapse:collapse;text-align:left}
th,td{padding:15px 18px;border-bottom:1px solid var(--line-soft);vertical-align:top}
th{font-size:12px;letter-spacing:.04em;color:var(--accent);background:var(--accent-soft)}
tbody tr:last-child td{border-bottom:0}
@media(max-width:680px){
  .page{width:min(100% - 32px,1080px);padding-top:16px}
  .hero{padding:38px 0 30px}
  .summary{font-size:16px}
  .proof{padding:36px 0}
  .proof-grid{grid-template-columns:1fr}
  .chain{grid-template-columns:1fr}
  .chain-arrow{transform:rotate(90deg)}
  .proof-card{padding:20px}
  .evidence a,.actions a{flex:1 1 auto}
}
@media(prefers-color-scheme:dark){
  :root{
    color-scheme:dark;
    --bg:#0d1117;
    --card:#151b23;
    --ink:#f0f4f8;
    --ink-2:#b8c1cc;
    --line:#38414d;
    --line-soft:#2a323c;
    --accent:#8eaeff;
    --accent-soft:#18264b;
    --ok:#9bd7b0;
    --ok-bg:#173323;
    --review:#ffd38a;
    --review-bg:#3a2b12
  }
  .recovery{border-color:#775d2e;background:#2c2416;color:#f3d7a4}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}