/* language: CSS, file: static/style.css */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f4f6f8; color: #333; line-height: 1.6; display: flex; flex-direction: column; min-height: 100vh; }

/* Header & Nav */
header { background: #1a1a2e; color: #fff; padding: 1rem 2rem; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.logo { color: #ffd700; font-size: 1.4rem; font-weight: bold; text-decoration: none; letter-spacing: 1px; }
nav a { color: #e0e0e0; text-decoration: none; margin-left: 20px; font-size: 0.9rem; }
nav a:hover { color: #ffd700; }

/* Main */
main { flex: 1; max-width: 1200px; margin: 0 auto; padding: 2rem; width: 100%; }

/* Hero */
.hero { text-align: center; padding: 4rem 0; background: #fff; border-radius: 8px; margin-bottom: 2rem; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.hero h1 { font-size: 2.5rem; margin-bottom: 1rem; color: #1a1a2e; }
.hero p { color: #666; font-size: 1.1rem; }

/* Catalogue Grid */
.catalogue h2 { margin-bottom: 1.5rem; color: #1a1a2e; }
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 2rem; }
.product-card { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: transform 0.2s; }
.product-card:hover { transform: translateY(-5px); }
.product-info { padding: 1.5rem; text-align: center; }
.product-info h3 { margin-bottom: 0.5rem; }
.price { font-size: 1.2rem; color: #d32f2f; font-weight: bold; margin-bottom: 1rem; }
.btn { display: inline-block; background: #1a1a2e; color: #fff; padding: 0.6rem 1.2rem; text-decoration: none; border-radius: 4px; font-weight: bold; transition: background 0.2s; }
.btn:hover { background: #ffd700; color: #1a1a2e; }
.btn.disabled { background: #ccc; cursor: not-allowed; }

/* Book Cover Simulation */
.book-cover { background: #111; color: #fff; height: 300px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 20px; border-left: 8px solid #333; }
.book-cover h2 { font-family: 'Times New Roman', serif; font-size: 1.8rem; line-height: 1.2; margin: 10px 0; }
.book-cover span { font-size: 0.7rem; letter-spacing: 3px; color: #888; }
.book-cover.placeholder { background: #222; color: #555; }
.book-cover.large { height: 450px; width: 300px; border-left-width: 12px; }

/* Product Detail Page */
.product-detail-container { display: flex; gap: 4rem; background: #fff; padding: 3rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.product-image-large { flex: 1; display: flex; justify-content: center; }
.product-info-large { flex: 1.2; display: flex; flex-direction: column; justify-content: center; }
.product-info-large h1 { font-size: 2rem; margin-bottom: 1rem; }
.price-large { font-size: 2rem; color: #d32f2f; font-weight: bold; margin-bottom: 1.5rem; }
.description { color: #555; margin-bottom: 2rem; font-size: 1.1rem; }

/* QR Section */
.qr-section { display: flex; align-items: center; gap: 20px; background: #f8f9fa; padding: 15px; border-radius: 8px; border: 1px solid #eee; margin-bottom: 2rem; }
.qr-code { width: 100px; height: 100px; }
.qr-section p { font-size: 0.9rem; color: #666; }

/* Buy Button */
.buy-btn { background: #1a1a2e; color: #fff; border: none; padding: 1rem; font-size: 1.1rem; font-weight: bold; border-radius: 6px; cursor: pointer; transition: background 0.2s; width: 100%; }
.buy-btn:hover { background: #ffd700; color: #1a1a2e; }
.secure-text { text-align: center; font-size: 0.85rem; color: #888; margin-top: 1rem; }

/* Policy Pages */
.policy-content { background: #fff; padding: 3rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); max-width: 800px; margin: 0 auto; }
.policy-content h1 { margin-bottom: 1.5rem; color: #1a1a2e; }
.policy-content h3 { margin: 1.5rem 0 0.5rem; color: #333; }
.policy-content p { color: #555; margin-bottom: 1rem; }

/* Footer */
footer { background: #1a1a2e; color: #aaa; text-align: center; padding: 2rem; margin-top: 3rem; }
.footer-links { margin: 1rem 0; }
.footer-links a { color: #ffd700; text-decoration: none; margin: 0 5px; font-size: 0.9rem; }
.address { font-size: 0.8rem; color: #666; }

@media (max-width: 768px) {
    .product-detail-container { flex-direction: column; padding: 1.5rem; }
    .book-cover.large { width: 100%; max-width: 300px; margin: 0 auto; }
    .nav-container { flex-direction: column; gap: 1rem; }
}