:root { --fg: #1c1c1c; --muted: #6b6b6b; --line: #e6e3dc; --bg: #faf8f4; --accent: #1c1c1c; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--fg); background: var(--bg); }
header { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--line); background: #fff; }
nav { display: flex; gap: 16px; align-items: center; }
a { color: inherit; }
main { max-width: 960px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 1.5rem; margin: 0 0 12px; }
[hidden] { display: none !important; }
button, .btn { font: inherit; cursor: pointer; border: 1px solid var(--accent); background: var(--accent); color: #fff; padding: 8px 14px; border-radius: 6px; text-decoration: none; display: inline-block; text-align: center; }
.btn.secondary, header button { background: transparent; color: var(--accent); }
header button { border: 0; padding: 0; text-decoration: underline; }
#login { max-width: 420px; margin: 8vh auto 0; }
#login-form { display: flex; gap: 8px; flex-wrap: wrap; }
#login-form input { flex: 1 1 220px; font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; }
#login-error { color: #a33; }
#grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 20px; }
.book { display: flex; flex-direction: column; gap: 8px; }
.cover { aspect-ratio: 3 / 4; width: 100%; object-fit: cover; background: var(--line); border-radius: 6px; }
.book.locked .cover { opacity: .45; }
.book h2 { font-size: .95rem; margin: 0; font-weight: 600; }
.actions { display: flex; gap: 6px; margin-top: auto; }
.actions .btn { flex: 1; padding: 6px 8px; font-size: .9rem; }