:root { --max: 1100px; --radius: 14px; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; line-height: 1.45; }
a { color: inherit; text-decoration: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 24px; }

.site-header { border-bottom: 1px solid #eee; position: sticky; top: 0; background: #fff; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { font-weight: 700; letter-spacing: .5px; }
.links a { margin-left: 14px; opacity: .85; }
.links a:hover { opacity: 1; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-top: 18px; }
.card { border: 1px solid #eee; border-radius: var(--radius); overflow: hidden; background: #fff; transition: transform .08s ease; }
.card:hover { transform: translateY(-2px); }
.card img { width: 100%; height: 220px; object-fit: cover; display: block; }
.meta { padding: 12px; }
.title { font-weight: 650; }
.tag { margin-top: 6px; font-size: 12px; opacity: .7; }

.book { display: grid; grid-template-columns: 320px 1fr; gap: 22px; align-items: start; }
.cover { width: 100%; border-radius: var(--radius); border: 1px solid #eee; }

.stack { display: grid; gap: 10px; max-width: 560px; }
input, textarea { padding: 12px 12px; border: 1px solid #ddd; border-radius: 10px; font: inherit; }
.btn { display: inline-block; padding: 12px 14px; border-radius: 12px; border: 1px solid #ddd; background: #111; color: #fff; width: fit-content; }
.muted { opacity: .7; }
.error { color: #b00020; }

.site-footer { border-top: 1px solid #eee; margin-top: 40px; padding: 16px 0; }

@media (max-width: 820px) {
  .book { grid-template-columns: 1fr; }
  .card img { height: 200px; }
}