:root {
    --primary: #1e3a5f;
    --primary-hover: #142842;
    --accent: #c59b27;
    --accent-hover: #a6811e;
    --bg-main: #faf9f6;
    --bg-card: #ffffff;
    --text-primary: #1c2530;
    --text-secondary: #5a6675;
    --border-color: #e2e6eb;
    --shadow: 0 4px 20px rgba(0,0,0,0.06);
    --radius: 8px;
    --font-heading: 'Cinzel', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 20px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--primary);
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.6rem;
}

.search-bar {
    display: flex;
    align-items: center;
    background: #f1f4f8;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 6px 14px;
    width: 320px;
}

.search-bar input {
    border: none;
    background: transparent;
    outline: none;
    width: 100%;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.search-bar button {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

.cart-btn {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--radius);
    background: #f1f4f8;
    transition: background 0.2s;
}

.cart-btn:hover {
    background: #e2e8f0;
}

.cart-icon {
    font-size: 1.3rem;
}

.cart-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 22px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: #e9ecef;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #dde1e5;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #172a3a 0%, #0d1b2a 100%);
    color: #fff;
    padding: 70px 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
}

.hero-text .badge {
    background: rgba(197, 155, 39, 0.2);
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.hero-text h1 {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    line-height: 1.2;
    margin: 16px 0;
}

.hero-text p {
    color: #c4d1de;
    font-size: 1.1rem;
    margin-bottom: 24px;
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero-card {
    display: flex;
    justify-content: center;
}

.hero-book-preview {
    background: #1b263b;
    border: 1px solid #415a77;
    border-radius: 12px;
    padding: 30px;
    width: 300px;
    box-shadow: 0 16px 36px rgba(0,0,0,0.4);
    position: relative;
}

.book-tag {
    display: inline-block;
    background: var(--accent);
    color: #1a1a1a;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.book-cover-mockup h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 6px;
}

.book-cover-mockup .author {
    color: #a0aec0;
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.book-cover-mockup .price {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

/* Categories */
.categories {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-top: 36px;
    padding-bottom: 20px;
}

.cat-pill {
    padding: 8px 18px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: all 0.2s;
}

.cat-pill.active, .cat-pill:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Catalog Grid */
.catalog {
    padding-top: 20px;
    padding-bottom: 60px;
}

.section-header {
    margin-bottom: 30px;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--primary);
}

.section-header p {
    color: var(--text-secondary);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.book-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.book-thumb {
    height: 220px;
    background: #f0f4f8;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.book-icon-bg {
    font-size: 3.5rem;
    margin-bottom: 6px;
}

.book-category-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(30, 58, 95, 0.85);
    color: #fff;
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
}

.book-details {
    padding: 18px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.book-details h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    margin-bottom: 4px;
    color: var(--primary);
}

.book-details .author {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.book-details .desc {
    color: #64748b;
    font-size: 0.85rem;
    margin-bottom: 16px;
    flex-grow: 1;
}

.book-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}

.book-footer .price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Features */
.features-bar {
    background: #f1f5f9;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.f-icon {
    font-size: 2rem;
    background: #fff;
    padding: 10px;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.feature-item h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    color: var(--primary);
}

.feature-item p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* About */
.about-section {
    padding: 70px 20px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: center;
}

.about-text h2 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 18px;
}

.about-text p {
    margin-bottom: 14px;
    color: #475569;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-box {
    background: #fff;
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-box h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--accent);
}

.stat-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Cart Drawer */
.cart-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.cart-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.cart-drawer {
    position: fixed;
    top: 0;
    right: -420px;
    width: 380px;
    max-width: 90vw;
    height: 100vh;
    background: #fff;
    z-index: 210;
    display: flex;
    flex-direction: column;
    box-shadow: -5px 0 25px rgba(0,0,0,0.15);
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.cart-drawer.active {
    right: 0;
}

.cart-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-cart {
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.cart-items {
    padding: 20px;
    flex-grow: 1;
    overflow-y: auto;
}

.empty-cart-msg {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 40px;
}

.cart-item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid #f0f0f0;
}

.cart-item-info h5 {
    font-size: 0.95rem;
    color: var(--primary);
}

.cart-item-info span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.remove-item-btn {
    background: none;
    border: none;
    color: #e53e3e;
    font-size: 1.1rem;
    cursor: pointer;
}

.cart-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: #f8fafc;
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

/* Footer */
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 60px 0 30px;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
}

.footer-logo {
    color: #fff;
    margin-bottom: 14px;
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer-col a {
    display: block;
    color: #94a3b8;
    text-decoration: none;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: #fff;
}

.subscribe-form {
    display: flex;
    margin-top: 12px;
}

.subscribe-form input {
    padding: 8px 12px;
    border: none;
    border-radius: 4px 0 0 4px;
    outline: none;
    font-size: 0.85rem;
    width: 70%;
}

.subscribe-form button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-weight: 600;
}

.copyright {
    margin-top: 16px;
    font-size: 0.8rem;
    color: #64748b;
}

/* Error 404 */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #f8fafc;
    text-align: center;
}

.error-container {
    max-width: 500px;
    padding: 40px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
    border: 1px solid var(--border-color);
}

.error-book-icon {
    font-size: 4rem;
    margin-bottom: 10px;
}

.error-code {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 12px;
}

.error-container h2 {
    font-size: 1.4rem;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.error-container p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.error-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
    .search-bar {
        display: none;
    }
    .nav-links {
        display: none;
    }
}