:root{
  --bg:#08101a; --card:#0f1720; --ink:#e6eef8; --muted:#90a7bf; --accent:#66a3ff; --line:#18202b;
  --radius:12px;
}
body.theme-light{ --bg:#f6f8fb; --card:#ffffff; --ink:#0c1216; --muted:#5a6679; --accent:#2b59ff; --line:#e6edf7; }
body.theme-sepia{ --bg:#fbf1e6; --card:#fff6ec; --ink:#2b1e11; --muted:#7a6b5a; --accent:#c0803b; --line:#f0e6db; }

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg); color:var(--ink); transition:background .25s,color .25s;
}

/* layout */
.wrap{max-width:1100px;margin:0 auto;padding:16px}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.small{font-size:12px}
.muted{color:var(--muted)}
.mt{margin-top:12px}

/* top nav */
.navbar{position:sticky;top:0;z-index:80;border-bottom:1px solid var(--line);
  backdrop-filter:saturate(140%) blur(6px); background:linear-gradient(180deg,color-mix(in oklab,var(--card),transparent 0%), color-mix(in oklab,var(--card),transparent 14%));
}
.brand{display:flex;gap:10px;align-items:center}
.logo{font-size:26px}
.brand h1{margin:0;font-size:20px}
.tag{font-size:12px;color:var(--muted)}

/* controls */
.nav-controls{display:flex;gap:8px;align-items:center}
.search,.select,.btn{
  padding:8px 10px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);
  font-size:14px;outline:none;
}
.search{min-width:180px}
.btn{cursor:pointer}
.section-title{font-weight:700;color:var(--accent);margin:18px 0 10px}
.section-sub{font-size:13px;color:var(--muted);margin:10px 0}

/* hero */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.hero-actions{margin-top:10px;display:flex;gap:8px}

/* grid & cards */
.grid{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:780px){.grid{grid-template-columns:1fr 1fr}}
@media(min-width:1100px){.grid{grid-template-columns:1fr 1fr 1fr}}

.card{transition:transform .14s,box-shadow .14s}
.card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,.4)}
.card h4{margin:0 0 8px;font-size:16px}
.card p{margin:0 0 10px;color:var(--muted)}
.meta{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px}
.chip{background:color-mix(in oklab,var(--accent),transparent 86%);padding:4px 8px;border-radius:999px}

/* empty */
.empty{color:var(--muted);border:1px dashed var(--line);padding:14px;border-radius:12px;text-align:center}

/* reader */
.reader{
  position:fixed;inset:6% 6% 6% 6%;background:var(--card);color:var(--ink);padding:24px;border-radius:12px;z-index:200;overflow:auto;
  box-shadow:0 18px 60px rgba(0,0,0,.6);
}
.reader .close{position:fixed;right:28px;top:28px;padding:8px;border-radius:8px}

/* top button */
.top-btn{position:fixed;right:16px;bottom:16px;padding:10px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);display:none}
.top-btn.show{display:block}

/* footer */
.footer {
  text-align: center;
  padding: 15px 0;
  font-size: 1rem;
  color: #555;
}

/* responsive */
@media(max-width:640px){
  .nav-controls{flex-direction:column;align-items:stretch}
  .search{width:100%}
}