/* ===== CSS VARIABLES ===== */
:root {
    --primary: #1a3a5c;
    --primary-light: #2a5a8c;
    --primary-dark: #0d1f33;
    --secondary: #c9a84c;
    --secondary-light: #e8d5a3;
    --accent: #e67e22;
    --bg: #f5f2ed;
    --white: #ffffff;
    --gray: #6b6b6b;
    --light-gray: #e8e4df;
    --dark: #1e1e1e;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --transition: all 0.3s ease;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --max-width: 1280px;
}

/* ===== RESET & BASE ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--dark);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; width: 100%; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font);
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-secondary { background: var(--secondary); color: var(--white); }
.btn-secondary:hover { background: #b8923a; transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-danger { background: #e74c3c; color: var(--white); }
.btn-danger:hover { background: #c0392b; }
.btn-success { background: #27ae60; color: var(--white); }
.btn-success:hover { background: #219a52; }

/* ===== HEADER / NAVBAR ===== */
header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    flex-wrap: wrap;
    gap: 12px;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.logo i { color: var(--secondary); }
.logo span { font-weight: 300; color: var(--secondary); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}
.nav-links a:hover, .nav-links a.active {
    background: var(--primary);
    color: var(--white);
}
.nav-links a.admin-link { color: var(--secondary); }
.nav-links a.admin-link:hover { background: var(--secondary); color: var(--white); }

.hamburger {
    display: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--primary);
    background: none;
    border: none;
    padding: 4px 8px;
}

/* ===== PAGE CONTAINER ===== */
.page { display: none; padding: 30px 0 60px; flex: 1; }
.page.active { display: block; }

/* ===== SLIDER ===== */
.slider-container {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
    background: var(--primary-dark);
    height: 380px;
}
.slider-track { display: flex; transition: transform 0.6s ease; height: 100%; }
.slide {
    min-width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    overflow: hidden;
}
.slide img { width: 100%; height: 100%; object-fit: cover; }
.slide-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(26,58,92,0.85) 0%, rgba(13,31,51,0.7) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px 60px;
    color: var(--white);
}
.slide-overlay h2 { font-size: 2.6rem; font-weight: 700; margin-bottom: 8px; }
.slide-overlay p { font-size: 1.1rem; opacity: 0.9; max-width: 500px; }
.slide-overlay .btn { margin-top: 16px; align-self: flex-start; }

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(4px);
    border: none;
    color: var(--white);
    font-size: 1.8rem;
    padding: 12px 16px;
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition);
    z-index: 10;
}
.slider-btn:hover { background: rgba(255,255,255,0.45); }
.slider-btn.prev { left: 16px; }
.slider-btn.next { right: 16px; }

.slider-dots {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}
.slider-dots button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
}
.slider-dots button.active { background: var(--secondary); transform: scale(1.2); }

/* ===== SECTION TITLES ===== */
.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.section-title span { color: var(--secondary); }
.section-title .line { flex: 1; height: 3px; background: linear-gradient(to right, var(--secondary), transparent); }

/* ===== BOOK GRID ===== */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 30px;
}
.book-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}
.book-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.book-card .cover {
    height: 240px;
    background: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--gray);
    overflow: hidden;
    position: relative;
}
.book-card .cover img { width: 100%; height: 100%; object-fit: cover; }
.book-card .cover .badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--secondary);
    color: var(--white);
    padding: 2px 12px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
}
.book-card .info { padding: 14px 16px 18px; flex: 1; display: flex; flex-direction: column; }
.book-card .info h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.book-card .info .author { font-size: 0.85rem; color: var(--gray); margin-bottom: 8px; }
.book-card .info .meta {
    font-size: 0.8rem;
    color: var(--gray);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: auto;
}
.book-card .info .meta span { background: var(--bg); padding: 2px 10px; border-radius: 12px; }

/* ===== LIST VIEW ===== */
.book-list { display: flex; flex-direction: column; gap: 16px; }
.book-list .book-card { flex-direction: row; align-items: stretch; min-height: 160px; }
.book-list .book-card .cover { width: 140px; height: 160px; flex-shrink: 0; }
.book-list .book-card .info { flex: 1; justify-content: center; }

/* ===== CATALOG TOOLBAR ===== */
.catalog-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-bottom: 24px;
    padding: 16px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.catalog-toolbar .search-box {
    flex: 1;
    min-width: 180px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg);
    border-radius: var(--radius);
    padding: 0 12px;
}
.catalog-toolbar .search-box input {
    border: none;
    background: transparent;
    padding: 10px 0;
    font-size: 0.95rem;
    width: 100%;
    outline: none;
    font-family: var(--font);
}
.catalog-toolbar .search-box i { color: var(--gray); }
.catalog-toolbar select {
    padding: 10px 14px;
    border: 1px solid var(--light-gray);
    border-radius: var(--radius);
    background: var(--white);
    font-size: 0.9rem;
    font-family: var(--font);
    cursor: pointer;
    outline: none;
    min-width: 130px;
}
.catalog-toolbar select:focus { border-color: var(--primary); }
.view-toggle {
    display: flex;
    gap: 4px;
    background: var(--bg);
    padding: 4px;
    border-radius: var(--radius);
}
.view-toggle button {
    background: none;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--gray);
    transition: var(--transition);
}
.view-toggle button.active { background: var(--primary); color: var(--white); }
.view-toggle button:hover:not(.active) { background: var(--light-gray); }

/* ===== BOOK DETAILS ===== */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 24px;
    padding: 12px 0;
    border-bottom: 1px solid var(--light-gray);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--light-gray); }

.book-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.book-detail .images { display: flex; flex-direction: column; gap: 16px; }
.book-detail .images .main-img {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    background: var(--light-gray);
    height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: zoom-in;
}
.book-detail .images .main-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.4s ease;
}
.book-detail .images .main-img:hover img { transform: scale(1.08); }
.book-detail .images .thumbnails { display: flex; gap: 10px; flex-wrap: wrap; }
.book-detail .images .thumbnails img {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
}
.book-detail .images .thumbnails img:hover, .book-detail .images .thumbnails img.active { border-color: var(--secondary); }

.book-detail .info-detail h1 { font-size: 1.8rem; color: var(--primary); margin-bottom: 4px; }
.book-detail .info-detail .subtitle { color: var(--gray); margin-bottom: 16px; font-size: 0.95rem; }
.book-detail .info-detail .specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px 20px;
    margin: 16px 0;
    padding: 16px 0;
    border-top: 1px solid var(--light-gray);
    border-bottom: 1px solid var(--light-gray);
}
.book-detail .info-detail .specs .label { font-weight: 600; color: var(--primary); }
.book-detail .info-detail .specs .value { color: var(--dark); }
.book-detail .info-detail .description { margin: 16px 0; line-height: 1.8; color: #333; }
.book-detail .info-detail .actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--light-gray);
}
.book-detail .info-detail .actions .share-btns {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-left: auto;
}
.book-detail .info-detail .actions .share-btns a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--bg);
    color: var(--primary);
    transition: var(--transition);
    font-size: 1rem;
}
.book-detail .info-detail .actions .share-btns a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}
.print-dates { display: flex; flex-wrap: wrap; gap: 6px; }
.print-dates .date-tag { background: var(--bg); padding: 2px 12px; border-radius: 12px; font-size: 0.8rem; }

/* ===== CTA ===== */
.cta-section {
    background: var(--primary);
    color: var(--white);
    padding: 50px 40px;
    border-radius: var(--radius);
    text-align: center;
    margin: 40px 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(201,168,76,0.15) 0%, transparent 60%);
}
.cta-section h2 { font-size: 2rem; margin-bottom: 8px; }
.cta-section p { opacity: 0.85; max-width: 550px; margin: 0 auto 20px; font-size: 1.05rem; }
.cta-section .btn { background: var(--secondary); color: var(--white); }
.cta-section .btn:hover { background: #b8923a; transform: translateY(-2px); }

/* ===== ABOUT / CONTACT ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.about-grid h2 { color: var(--primary); margin-bottom: 12px; }
.about-grid p { color: #444; line-height: 1.8; }

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}
.contact-info {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.contact-info h2 { color: var(--primary); margin-bottom: 16px; }
.contact-info .item { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 16px; }
.contact-info .item i { width: 24px; color: var(--secondary); font-size: 1.2rem; margin-top: 2px; }
.contact-info .item .label { font-weight: 600; color: var(--primary); }

.contact-form {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.contact-form h2 { color: var(--primary); margin-bottom: 16px; }
.contact-form label { font-weight: 500; display: block; margin-bottom: 4px; font-size: 0.9rem; }
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--light-gray);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: var(--font);
    transition: var(--transition);
    margin-bottom: 14px;
    background: var(--bg);
}
.contact-form input:focus, .contact-form textarea:focus {
    border-color: var(--primary);
    outline: none;
    background: var(--white);
}
.contact-form textarea { min-height: 120px; resize: vertical; }

.map-container {
    border-radius: var(--radius);
    overflow: hidden;
    height: 220px;
    margin-top: 16px;
    box-shadow: var(--shadow);
}
.map-container iframe { width: 100%; height: 100%; border: 0; }

/* ===== FOOTER ===== */
footer {
    background: var(--primary-dark);
    color: #cbd5e1;
    padding: 40px 0 20px;
    margin-top: auto;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-grid h4 { color: var(--white); margin-bottom: 12px; font-size: 1.1rem; }
.footer-grid p, .footer-grid a { color: #94a3b8; font-size: 0.9rem; line-height: 1.8; }
.footer-grid a:hover { color: var(--secondary); }
.footer-grid .logo { color: var(--white); font-size: 1.3rem; }
.footer-grid .logo span { color: var(--secondary); }
.footer-bottom { text-align: center; padding-top: 20px; font-size: 0.85rem; color: #64748b; }
.footer-bottom a { color: var(--secondary); }

/* ===== ADMIN ===== */
.admin-login {
    max-width: 420px;
    margin: 60px auto;
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
}
.admin-login h2 { text-align: center; color: var(--primary); margin-bottom: 8px; }
.admin-login p { text-align: center; color: var(--gray); margin-bottom: 24px; }
.admin-login input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--light-gray);
    border-radius: var(--radius);
    margin-bottom: 14px;
    font-size: 0.95rem;
    font-family: var(--font);
}
.admin-login input:focus { border-color: var(--primary); outline: none; }
.admin-login .btn { width: 100%; justify-content: center; }
.admin-login .error { color: #e74c3c; text-align: center; margin-bottom: 12px; font-size: 0.9rem; }

.admin-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 30px;
    margin-top: 20px;
}
.admin-sidebar {
    background: var(--white);
    border-radius: var(--radius);
    padding: 16px 0;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 90px;
}
.admin-sidebar .admin-user {
    padding: 12px 20px 16px;
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    align-items: center;
    gap: 12px;
}
.admin-sidebar .admin-user i { font-size: 2rem; color: var(--secondary); }
.admin-sidebar .admin-user div { font-weight: 600; color: var(--primary); font-size: 0.9rem; }
.admin-sidebar .admin-user div small { display: block; font-weight: 400; color: var(--gray); font-size: 0.8rem; }

.admin-sidebar a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--dark);
    transition: var(--transition);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}
.admin-sidebar a:hover, .admin-sidebar a.active {
    background: var(--bg);
    border-left-color: var(--secondary);
    color: var(--primary);
}
.admin-sidebar a i { width: 20px; color: var(--gray); }
.admin-sidebar a:hover i { color: var(--secondary); }

.admin-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px 28px;
    box-shadow: var(--shadow);
}
.admin-content .admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--light-gray);
}
.admin-content .admin-header h2 { color: var(--primary); }

.admin-table-wrap { overflow-x: auto; }
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.admin-table th {
    text-align: left;
    padding: 10px 12px;
    background: var(--bg);
    font-weight: 600;
    color: var(--primary);
    border-bottom: 2px solid var(--light-gray);
}
.admin-table td { padding: 10px 12px; border-bottom: 1px solid var(--light-gray); vertical-align: middle; }
.admin-table tr:hover td { background: #faf8f6; }
.admin-table .actions { gap: 6px; }
.admin-table .actions .btn { padding: 4px 10px; font-size: 0.75rem; }

.admin-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 24px;
    background: var(--bg);
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}
.admin-form .full { grid-column: 1 / -1; }
.admin-form label { font-weight: 500; font-size: 0.85rem; color: var(--primary); display: block; margin-bottom: 2px; }
.admin-form input, .admin-form select, .admin-form textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: var(--font);
    background: var(--white);
}
.admin-form input:focus, .admin-form select:focus, .admin-form textarea:focus {
    border-color: var(--primary);
    outline: none;
}
.admin-form textarea { min-height: 80px; resize: vertical; }
.admin-form .form-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding-top: 8px;
}

/* ===== TOAST ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    padding: 14px 24px;
    border-radius: var(--radius);
    color: var(--white);
    font-weight: 500;
    box-shadow: var(--shadow-hover);
    animation: slideUp 0.3s ease;
    max-width: 380px;
}
.toast.success { background: #27ae60; }
.toast.error { background: #e74c3c; }
.toast.info { background: var(--primary); }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== COVER PLACEHOLDER ===== */
.cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    color: var(--white);
    text-transform: uppercase;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
}
.cover-placeholder.gold { background: linear-gradient(135deg, #8a7a3a, #c9a84c); }
.cover-placeholder.teal { background: linear-gradient(135deg, #1a6b6b, #2a9d8f); }
.cover-placeholder.rose { background: linear-gradient(135deg, #7a3a5a, #c94a7a); }
.cover-placeholder.indigo { background: linear-gradient(135deg, #3a3a7a, #5a5ac9); }

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .book-detail { grid-template-columns: 1fr; }
    .book-detail .images .main-img { height: 300px; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .admin-layout { grid-template-columns: 1fr; }
    .admin-sidebar {
        position: static;
        display: flex;
        flex-wrap: wrap;
        padding: 8px 12px;
        gap: 4px;
    }
    .admin-sidebar .admin-user { display: none; }
    .admin-sidebar a {
        padding: 8px 14px;
        border-left: none;
        border-bottom: 2px solid transparent;
    }
    .admin-sidebar a.active { border-bottom-color: var(--secondary); border-left-color: transparent; }
    .admin-form { grid-template-columns: 1fr; }
    .admin-form .full { grid-column: 1; }
}
@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 0 4px;
        gap: 4px;
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 10px 16px; border-radius: 6px; }
    .slider-container { height: 240px; }
    .slide-overlay { padding: 20px 28px; }
    .slide-overlay h2 { font-size: 1.6rem; }
    .slide-overlay p { font-size: 0.9rem; }
    .slider-btn { font-size: 1.2rem; padding: 8px 12px; }
    .book-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; }
    .book-card .cover { height: 180px; }
    .book-list .book-card { flex-direction: column; }
    .book-list .book-card .cover { width: 100%; height: 160px; }
    .book-detail { padding: 16px; }
    .book-detail .images .main-img { height: 220px; }
    .book-detail .info-detail .specs { grid-template-columns: 1fr; }
    .book-detail .info-detail h1 { font-size: 1.4rem; }
    .catalog-toolbar { flex-direction: column; align-items: stretch; }
    .catalog-toolbar .search-box { min-width: unset; }
    .catalog-toolbar .view-toggle { align-self: flex-start; }
    .footer-grid { grid-template-columns: 1fr; gap: 20px; }
    .contact-grid { grid-template-columns: 1fr; }
    .admin-content { padding: 16px; }
    .admin-table th, .admin-table td { padding: 6px 8px; font-size: 0.8rem; }
}
@media (max-width: 480px) {
    .book-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .book-card .cover { height: 150px; }
    .book-card .info { padding: 10px 12px 14px; }
    .book-card .info h3 { font-size: 0.85rem; }
    .slide-overlay h2 { font-size: 1.2rem; }
    .cta-section { padding: 30px 20px; }
    .cta-section h2 { font-size: 1.4rem; }
}