:root{--bg:#f7f7f8;--card:#fff;--text:#1f2937;--muted:#6b7280;--accent:#111827;--border:#e5e7eb;--danger:#b91c1c;--success:#166534}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit}.container{width:min(1120px,92%);margin:auto}.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.nav nav{display:flex;align-items:center;gap:15px;flex-wrap:wrap}.brand{font-size:1.25rem;font-weight:800;text-decoration:none}.nav a{text-decoration:none}.cart{font-weight:700}main{min-height:75vh;padding:28px 0}.hero{padding:34px;background:#111827;color:white;border-radius:20px;margin-bottom:28px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;box-shadow:0 4px 18px rgba(0,0,0,.035)}.book-cover{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:10px;background:#e5e7eb}.muted{color:var(--muted)}.price{font-size:1.15rem;font-weight:800;margin:.5rem 0}.btn{display:inline-block;border:0;background:var(--accent);color:white;padding:10px 15px;border-radius:10px;text-decoration:none;cursor:pointer;font-weight:700}.btn.secondary{background:#fff;color:var(--accent);border:1px solid var(--border)}.btn.danger{background:#991b1b}.btn.success{background:#166534}.form{max-width:620px}.form label{font-weight:700;display:block;margin:14px 0 6px}.form input,.form select,.form textarea{width:100%;padding:11px 12px;border:1px solid #d1d5db;border-radius:10px;background:#fff}.form textarea{min-height:120px}.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.alert{padding:12px 15px;border-radius:10px;margin-bottom:16px}.alert.error{background:#fee2e2;color:#991b1b}.alert.success{background:#dcfce7;color:#166534}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse;background:#fff}.table th,.table td{padding:12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#e5e7eb;font-size:.8rem}.actions{display:flex;gap:8px;flex-wrap:wrap}.reader{max-width:1000px;margin:auto}.reader-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}.reader-page{position:relative;background:#222;min-height:70vh;display:flex;align-items:center;justify-content:center;border-radius:14px;overflow:hidden}.reader-page img{max-width:100%;max-height:82vh;display:block}.watermark{position:absolute;inset:0;pointer-events:none;display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;color:rgba(255,255,255,.28);transform:rotate(-24deg);text-align:center;padding:20px}.admin-nav{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:20px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}.stat{font-size:1.6rem;font-weight:800}footer{padding:24px 0;color:var(--muted)}@media(max-width:700px){.nav{align-items:flex-start;padding:14px 0;flex-direction:column}.row{grid-template-columns:1fr}.hero{padding:24px}.reader-page{min-height:55vh}}