/* Shared styles for public case-brief pages (/cases/<slug>/). Dark theme to match the landing. */
:root{
  --bg:#0a1022;--bg-2:#0e1530;--surface:#131c39;--surface-2:#18234a;
  --border:rgba(255,255,255,.09);--border-2:rgba(255,255,255,.14);
  --text:#eaf0ff;--muted:#a9b6d6;--dim:#6f7fa6;--blue:#4f7cff;--purple:#8b5cf6;
  --grad:linear-gradient(120deg,#4f7cff 0%,#8b5cf6 100%);
  --grad-soft:linear-gradient(120deg,rgba(79,124,255,.18),rgba(139,92,246,.18));
  --maxw:820px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

header.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);background:rgba(10,16,34,.72);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:60px;max-width:var(--maxw);margin:0 auto;padding:0 22px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px}
.logo .mark{width:28px;height:28px;border-radius:7px;background:var(--grad);display:grid;place-items:center;font-size:15px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14.5px;padding:10px 18px;border-radius:11px;border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(79,124,255,.35)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.05);color:var(--text);border-color:var(--border-2)}
/* Compact, single-row header on phones (these pages are heavily mobile via search) */
@media(max-width:640px){
  .nav-inner{height:54px;padding:0 14px}
  .logo{font-size:15.5px;gap:7px}
  .logo .mark{width:25px;height:25px;font-size:13px}
  .nav .btn{padding:8px 12px;font-size:13px;box-shadow:none;white-space:nowrap;flex-shrink:0}
}

main{padding:38px 0 60px}
.crumb{font-size:13px;color:var(--dim);margin-bottom:14px}
.crumb a:hover{color:var(--muted)}
h1.case-title{font-size:clamp(26px,4vw,38px);font-weight:900;letter-spacing:-.02em;line-height:1.12}
.case-meta{color:var(--muted);font-size:15px;margin-top:8px}
.tagrow{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.tag{font-size:12px;color:var(--muted);background:var(--surface);border:1px solid var(--border-2);border-radius:999px;padding:4px 11px}

.bsec{margin-top:26px}
.bsec h2{font-size:13px;text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-weight:700;margin-bottom:8px}
.bsec p{color:var(--muted);font-size:16px;line-height:1.65}

/* Signup gate */
.gate{margin-top:30px;background:var(--grad-soft);border:1px solid var(--border-2);border-radius:18px;padding:28px 24px;text-align:center;position:relative;overflow:hidden}
.gate::before{content:"";position:absolute;top:-60px;left:0;right:0;height:60px;background:linear-gradient(to top,var(--bg-2),transparent);pointer-events:none}
.gate .lock{font-size:30px}
.gate h3{font-size:20px;font-weight:800;margin:8px 0 6px}
.gate p{color:var(--muted);font-size:15px;max-width:460px;margin:0 auto 18px}
.gate ul{list-style:none;display:inline-flex;flex-direction:column;gap:6px;text-align:left;margin:0 auto 22px;color:var(--muted);font-size:14.5px}
.gate li::before{content:"🔒 ";}

/* Sample question */
.sample{margin-top:34px;border-top:1px solid var(--border);padding-top:30px}
.sample .label{font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
.sample h2{font-size:22px;font-weight:800;margin:8px 0 4px}
.sample .sub{color:var(--dim);font-size:14px;margin-bottom:18px}
.demo-fact{font-size:14.5px;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:14px}
.demo-q{font-weight:600;font-size:16.5px;margin-bottom:14px}
.choice{display:block;width:100%;text-align:left;cursor:pointer;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border-2);border-radius:12px;padding:13px 16px;margin-bottom:10px;transition:border-color .15s}
.choice:hover:not(:disabled){border-color:var(--blue)}
.choice:disabled{cursor:default}
.choice.correct{border-color:#3fb950;background:rgba(63,185,80,.13);color:#b9f0c6}
.choice.wrong{border-color:#f0556a;background:rgba(240,85,106,.12);color:#ffc2cb}
.choice .tick{font-weight:800;margin-right:8px}
.demo-explain{display:none;margin-top:14px;padding:16px;border-radius:12px;background:var(--grad-soft);border:1px solid var(--border-2);font-size:14.5px;color:var(--muted)}
.demo-explain.show{display:block}
.demo-explain b{color:var(--text)}

.related{margin-top:36px}
.related h2{font-size:13px;text-transform:uppercase;letter-spacing:.1em;color:var(--dim);font-weight:700;margin-bottom:10px}
.related a{display:inline-block;font-size:14px;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:6px 13px;margin:0 6px 8px 0}
.related a:hover{border-color:var(--blue);color:var(--text)}

footer{border-top:1px solid var(--border);padding:34px 0;color:var(--dim);font-size:13px;text-align:center;margin-top:50px}
footer a{color:var(--muted)}

/* Hub (index) */
.hub-course{margin-top:34px}
.hub-course h2{font-size:18px;font-weight:800;margin-bottom:12px}
.hub-list{display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media(max-width:680px){.hub-list{grid-template-columns:1fr}}
.hub-list a{font-size:14px;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:10px 14px}
.hub-list a:hover{border-color:var(--blue);color:var(--text)}
.hy{color:var(--dim);font-weight:500}
.hc{color:var(--dim);font-weight:600;font-size:14px}

/* Hub search + course filters */
.searchbar{width:100%;margin-top:24px;background:var(--surface);border:1px solid var(--border-2);border-radius:12px;padding:14px 16px;font:inherit;font-size:16px;color:var(--text)}
.searchbar::placeholder{color:var(--dim)}
.searchbar:focus{outline:none;border-color:var(--blue)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;margin-bottom:6px}
.chip{font:inherit;font-size:13px;font-weight:600;cursor:pointer;padding:7px 13px;border-radius:999px;background:var(--surface);color:var(--muted);border:1px solid var(--border);transition:border-color .15s,background .15s,color .15s}
.chip:hover{border-color:var(--blue)}
.chip.active{background:var(--grad);color:#fff;border-color:transparent}
.hub-empty{text-align:center;color:var(--muted);margin-top:34px;font-size:15px}

/* Flat, in-course-style results list (top 50 + search to narrow) */
.results-meta{margin-top:16px;font-size:13.5px;color:var(--dim)}
.results-meta b{color:var(--muted)}
.case-results{display:flex;flex-direction:column;gap:8px;margin-top:12px}
.hub-item{display:flex;align-items:baseline;justify-content:space-between;gap:14px;background:var(--surface);border:1px solid var(--border);border-radius:11px;padding:13px 16px;color:var(--text)}
.hub-item:hover{border-color:var(--blue)}
.hub-item .ht{font-weight:600;font-size:15px}
.hub-item .hmeta{flex-shrink:0;font-size:12.5px;color:var(--dim);text-align:right}
.hub-more{text-align:center;color:var(--dim);font-size:13.5px;margin-top:18px}