:root {
  --navy: #1b2a4a;
  --navy-dark: #0f1728;
  --gold: #d4af37;
  --gold-light: #e8c873;
  --bg: #f7f8fb;
  --text: #1f2937;
}

* { box-sizing: border-box; }
body {
  font-family: 'Cairo', sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
}
a { text-decoration: none; color: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* ---------- Navbar ---------- */
.navbar { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 50; }
.navbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; flex-wrap: wrap; }
.logo { font-size: 22px; font-weight: 800; color: var(--gold); }
.logo span { color: #fff; }
.search-form input { padding: 8px 16px; border-radius: 30px; border: none; width: 260px; max-width: 40vw; }
.nav-links { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.nav-links a { padding: 6px 4px; }
.btn-gold, .btn-outline { padding: 8px 18px; border-radius: 30px; font-weight: 700; }
.btn-gold { background: var(--gold); color: var(--navy-dark); }
.btn-outline { border: 1px solid rgba(255,255,255,.4); }

/* ---------- Buttons ---------- */
.btn { display: inline-block; padding: 12px 28px; border-radius: 30px; font-weight: 700; border: none; cursor: pointer; font-family: inherit; font-size: 15px; }
.btn-primary { background: var(--navy); color: #fff; }
.btn-primary:hover { background: var(--navy-dark); }
.btn-secondary { background: var(--gold); color: var(--navy-dark); }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(135deg, var(--navy), var(--navy-dark)); color: #fff; text-align: center; padding: 70px 16px; }
.hero h1 { font-size: 38px; margin-bottom: 12px; }
.hero .gold { color: var(--gold-light); }
.hero p { color: #cbd5e1; max-width: 600px; margin: 0 auto 24px; }
.hero-search { max-width: 420px; width: 100%; margin: 0 auto; display: flex; gap: 8px; }
.hero-search input { flex: 1; min-width: 0; padding: 12px 18px; border-radius: 30px; border: none; font-family: inherit; font-size: 14px; }
.hero-search button { flex-shrink: 0; }

/* ---------- Sections ---------- */
.section { max-width: 1200px; margin: 0 auto; padding: 30px 16px; }
.section-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.section-head h2 { font-size: 20px; }

.categories { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 8px; }
.category-pill { flex-shrink: 0; background: #fff; border: 1px solid #e5e7eb; padding: 8px 18px; border-radius: 30px; font-size: 14px; }
.category-pill.active { background: var(--navy); color: #fff; border-color: var(--navy); }

/* ---------- Book Grid ---------- */
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; }
.book-card { background: #fff; border-radius: 16px; overflow: hidden; border: 1px solid #f1f1f1; transition: box-shadow .2s, transform .2s; }
.book-card:hover { box-shadow: 0 10px 25px rgba(0,0,0,.08); transform: translateY(-3px); }
.book-cover { position: relative; aspect-ratio: 3/4; background: #eef1f8; overflow: hidden; }
.book-cover img { width: 100%; height: 100%; object-fit: cover; }
.badge-free { position: absolute; top: 8px; right: 8px; background: #22c55e; color: #fff; font-size: 11px; font-weight: 700; padding: 3px 8px; border-radius: 20px; }
.book-info { padding: 10px 12px; }
.book-info h3 { font-size: 14px; margin: 0 0 4px; min-height: 36px; line-height: 1.3; }
.book-info .author { font-size: 12px; color: #6b7280; margin-bottom: 6px; }
.book-info .price { font-weight: 800; color: var(--navy); }

/* ---------- Forms ---------- */
.form-card { background: #fff; border-radius: 16px; padding: 24px; max-width: 420px; margin: 40px auto; box-shadow: 0 4px 20px rgba(0,0,0,.05); }
.form-card h1 { text-align: center; font-size: 22px; margin-bottom: 20px; }
.form-group { margin-bottom: 14px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid #e5e7eb; border-radius: 10px; font-family: inherit; font-size: 14px;
}
.form-actions { display: flex; justify-content: space-between; font-size: 13px; margin-top: 10px; color: #6b7280; }
.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }

/* ---------- Book Detail ---------- */
.book-detail { display: grid; grid-template-columns: 300px 1fr; gap: 40px; padding: 40px 0; }
.book-detail-cover img { width: 100%; border-radius: 16px; box-shadow: 0 10px 30px rgba(0,0,0,.1); }
.book-detail h1 { font-size: 28px; margin: 10px 0; }
.book-detail .cat-badge { background: rgba(212,175,55,.12); color: #b8952c; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.book-detail .desc { line-height: 1.9; color: #374151; margin: 20px 0; white-space: pre-line; }
.price-row { display: flex; align-items: center; gap: 16px; margin-top: 24px; }
.price-row .price { font-size: 30px; font-weight: 800; color: var(--navy); }

@media (max-width: 768px) {
  .book-detail { grid-template-columns: 1fr; }
  .search-form { display: none; }
}

/* ---------- Tables (Admin) ---------- */
.admin-wrap { display: flex; min-height: 100vh; }
.admin-sidebar { width: 230px; background: var(--navy-dark); color: #fff; padding: 20px; flex-shrink: 0; }
.admin-sidebar h2 { color: var(--gold-light); font-size: 16px; margin-bottom: 24px; }
.admin-sidebar a { display: block; padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 4px; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(255,255,255,.08); }
.admin-main { flex: 1; padding: 24px; background: #f3f4f6; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 30px; }
.stat-card { background: #fff; border-radius: 14px; padding: 18px; }
.stat-card .label { color: #6b7280; font-size: 13px; }
.stat-card .value { font-size: 24px; font-weight: 800; color: var(--navy); margin-top: 4px; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
th, td { padding: 12px; text-align: right; font-size: 14px; border-top: 1px solid #f1f1f1; }
th { background: #f9fafb; color: #6b7280; font-weight: 700; }
.status { padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.status-paid { background: #dcfce7; color: #166534; }
.status-pending { background: #fef9c3; color: #854d0e; }
.status-refunded { background: #f3f4f6; color: #6b7280; }

/* ---------- Footer ---------- */
.footer { background: var(--navy-dark); color: #cbd5e1; margin-top: 60px; padding: 40px 0 16px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 24px; font-size: 14px; }
.footer-grid h4 { color: var(--gold-light); margin-bottom: 10px; }
.footer-grid a { display: block; margin-bottom: 6px; }
.copyright { text-align: center; font-size: 12px; margin-top: 24px; opacity: .7; }