:root{
  --bg:#f6f8fb; --card:#ffffff; --text:#0f172a; --muted:#475569; --border:#e2e8f0;
  --brand:#2563eb; --brand2:#0ea5e9; --success:#16a34a; --danger:#dc2626; --shadow:0 10px 30px rgba(2,6,23,.08);
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;color:var(--text);background:var(--bg)}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:18px}
.header{position:sticky;top:0;z-index:50;background:rgba(246,248,251,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.navbar{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;color:var(--text)}
.brand-badge{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow)}
.nav-links{display:flex;gap:14px;align-items:center}
.nav-links a{color:var(--text);opacity:.9;font-weight:700}
.nav-links a.active{color:var(--brand)}
.menu-btn{display:none;border:1px solid var(--border);background:var(--card);border-radius:12px;padding:10px 12px;cursor:pointer}
.mobile-panel{display:none;border-top:1px solid var(--border);background:var(--card)}
.mobile-panel a{display:block;padding:12px 18px;border-bottom:1px solid var(--border);color:var(--text);font-weight:800}
.mobile-panel.open{display:block}
.hero{margin-top:18px;background:linear-gradient(180deg,#ffffff,#f3f7ff);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.3fr .7fr;gap:18px;padding:22px}
.hero h1{margin:0;font-size:34px;letter-spacing:-.02em}
.hero p{color:var(--muted);line-height:1.6;margin:10px 0 0}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.section{margin-top:18px}
.section-title{font-size:18px;margin:0 0 10px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.book{padding:14px;display:flex;gap:12px}
.book img{width:72px;height:100px;object-fit:cover;border-radius:12px;border:1px solid var(--border);background:#fff}
.book h3{margin:0;font-size:15px}
.book p{margin:6px 0 0;color:var(--muted);font-size:13px;line-height:1.35}
.badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);color:var(--muted);font-weight:800;font-size:12px;background:#fff}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:12px;padding:2px 8px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--muted)}
.form{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.input{flex:1;min-width:220px;padding:12px;border-radius:12px;border:1px solid var(--border);background:#fff;font-size:14px}
.select{padding:12px;border-radius:12px;border:1px solid var(--border);background:#fff}
.btn{border:none;border-radius:12px;padding:12px 14px;font-weight:900;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
.btn-ghost{background:#fff;border:1px solid var(--border);color:var(--text)}
.btn-success{background:var(--success);color:#fff}
.btn-danger{background:var(--danger);color:#fff}
.btn:active{transform:translateY(1px)}
.footer{margin-top:24px;padding:18px 0;color:var(--muted);font-size:13px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:14px}
.footer a{color:var(--muted);font-weight:800}
.alert{padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:#fff}
.alert.ok{border-color:rgba(22,163,74,.35)}
.alert.err{border-color:rgba(220,38,38,.35)}
.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:10px;border-bottom:1px solid var(--border);text-align:left;font-size:14px}
.table th{color:var(--muted);font-weight:900;background:#f8fafc}
.small{font-size:12px;color:var(--muted)}
.two-col{display:grid;grid-template-columns:0.9fr 1.1fr;gap:18px}
.cover-big{width:100%;max-width:360px;border-radius:16px;border:1px solid var(--border);background:#fff;box-shadow:var(--shadow)}
.meta{width:100%;border-collapse:collapse}
.meta td{padding:10px;border-bottom:1px solid var(--border);vertical-align:top}
.meta td:first-child{color:var(--muted);font-weight:900;width:140px}
.desc{padding:14px;line-height:1.7}
.notice{padding:12px 14px;border-radius:14px;background:#fff;border:1px dashed var(--border);color:var(--muted);line-height:1.6}
@media (max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.hero-inner{grid-template-columns:1fr}.two-col{grid-template-columns:1fr}}
@media (max-width:650px){.nav-links{display:none}.menu-btn{display:inline-flex}.grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}}