:root{--bg:#0b1220;--panel:#121a2b;--text:#e6ecff;--muted:#a6b0cf;--accent:#5b8cff;--danger:#ff6b6b}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,Segoe UI,Roboto,Ubuntu,Arial}
a{color:var(--accent);text-decoration:none}
img{max-width:100%;display:block}

/* Header */
.site-header{background:var(--panel);border-bottom:1px solid #1e2742;position:sticky;top:0;z-index:10}
.nav-container{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 16px}
.logo{font-weight:700}
.nav-links{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.nav-item{padding:6px 10px;border-radius:10px}
.nav-item.highlight{background:var(--accent);color:#fff}
.lang-switch img{border-radius:4px}

/* Main wrap */
.main-content{max-width:1100px;margin:24px auto;padding:0 16px}

/* Grid */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:20px;margin-top:20px}

/* Card */
.book-card{background:var(--panel);border:1px solid #1e2742;border-radius:14px;overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,box-shadow .15s ease}
.book-card:hover{transform:translateY(-4px);box-shadow:0 8px 22px rgba(0,0,0,.35)}

/* Thumb with fixed ratio (works everywhere that supports aspect-ratio) */
.book-thumb{position:relative;overflow:hidden;border-bottom:1px solid #1e2742;background:#0e1628}
.book-thumb img{width:100%;height:100%;object-fit:cover;aspect-ratio:3/4}

/* Content */
.book-info{padding:14px;display:flex;flex-direction:column;gap:8px}
.book-info h2{margin:4px 0 2px 0;font-size:18px;line-height:1.3}
.author,.category,.summary{color:var(--muted);font-size:14px}
.summary{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:8px 12px;border-radius:12px;margin-top:4px}

/* Book details */
.book-details .book-header{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap}
.book-cover{width:260px;max-width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:12px;border:1px solid #1e2742;background:#0e1628}
.book-meta{min-width:260px;flex:1}
.book-summary,.book-takeaways{background:var(--panel);border:1px solid #1e2742;border-radius:16px;padding:16px;margin:16px 0}

/* Comments */
.comments .comment{background:var(--panel);border:1px solid #1e2742;border-radius:12px;padding:12px;margin:12px 0}
.c-meta{color:var(--muted);font-size:13px;margin-bottom:6px}
.c-actions{display:flex;gap:10px;align-items:center;margin-top:8px}
.vote-btn{background:#182340;color:#d1d9ff;border:1px solid #26325a;border-radius:10px;padding:6px 10px;cursor:pointer}
.vote-btn[disabled]{opacity:.6;cursor:not-allowed}
.comment-form textarea{width:100%;min-height:120px;border-radius:12px;border:1px solid #26325a;background:#0f1830;color:#e6ecff;padding:10px}

/* Forms / Admin */
.auth-form,.book-form{background:var(--panel);border:1px solid #1e2742;border-radius:16px;padding:16px;max-width:560px}
.auth-form input,.auth-form textarea,.book-form input,.book-form textarea,.book-form select{
  width:100%;margin:6px 0 12px 0;background:#0f1830;border:1px solid #26325a;color:#e6ecff;border-radius:10px;padding:10px
}
.alert{background:#2a1a1d;color:#ffb3b3;border:1px solid #5c2b33;padding:10px;border-radius:10px;margin:10px 0}

.admin-table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid #1e2742;border-radius:12px;overflow:hidden}
.admin-table th,.admin-table td{padding:10px;border-bottom:1px solid #1e2742;text-align:left}
.admin-table tr.deleted{opacity:.6}
.btn.small{padding:4px 8px;font-size:12px}
.btn.small.danger{background:var(--danger)}

/* Footer */
.site-footer{border-top:1px solid #1e2742;background:#0c1526;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:1100px;margin:0 auto;padding:18px 16px}
.copy-line{text-align:center;color:var(--muted);padding:12px 0;border-top:1px solid #1e2742}

/* Responsive */
@media (max-width:720px){
  .book-details .book-header{flex-direction:column;align-items:center}
  .book-cover{width:100%}
  .footer-grid{grid-template-columns:1fr}
}