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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --text-light: #666;
    --border-color: #e0e0e0;
    --background-light: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.logo, .footer-logo {
    width: 32px;
    height: 32px;
    margin-right: 10px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--background-light) 0%, var(--white) 100%);
    padding: 4rem 20px;
    display: flex;
    align-items: center;
    min-height: 500px;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero h1 {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image img {
    width: 100%;
    height: auto;
    max-width: 400px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--secondary-color);
    color: var(--white);
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--primary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background: #1a252f;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-outline:hover {
    background: var(--secondary-color);
    color: var(--white);
}

/* Sections */
.featured-books,
.categories-preview {
    padding: 4rem 20px;
}

.featured-books h2,
.categories-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
}

.section-actions {
    text-align: center;
    margin-top: 3rem;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.book-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.book-image {
    width: 100%;
    height: 200px;
    background: var(--background-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-image img {
    width: 120px;
    height: 160px;
    object-fit: cover;
}

.book-info {
    padding: 1.5rem;
}

.book-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.book-author {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.book-category {
    display: inline-block;
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.book-description {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.category-card {
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

.category-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
}

.category-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.category-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.category-link:hover {
    text-decoration: underline;
}

/* Search and Filter */
.search-filter {
    background: var(--background-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 3rem;
}

.search-filter-grid {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 1rem;
    align-items: end;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.form-input,
.form-select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Book Detail */
.book-detail {
    padding: 3rem 20px;
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.book-detail-image {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
}

.book-detail-image img {
    width: 200px;
    height: 280px;
    object-fit: cover;
    border-radius: var(--border-radius);
}

.book-detail-info h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.book-meta {
    margin-bottom: 2rem;
}

.book-meta p {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.book-meta strong {
    color: var(--text-color);
}

.book-links {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.external-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
}

.external-link:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.book-content h2 {
    color: var(--primary-color);
    margin: 2rem 0 1rem 0;
    font-size: 1.5rem;
}

.book-content ul {
    margin-left: 2rem;
    margin-bottom: 2rem;
}

.book-content li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.third-party-notice {
    background: var(--background-light);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
    text-align: center;
}

.third-party-notice p {
    color: var(--text-light);
    font-style: italic;
}

/* Content Pages */
.content-page {
    padding: 3rem 20px;
}

.content-page h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.content-page h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin: 2rem 0 1rem 0;
}

.content-page h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin: 1.5rem 0 0.5rem 0;
}

.content-page p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.content-page ul,
.content-page ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-page li {
    margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--background-light);
    padding: 2rem;
    border-radius: var(--border-radius);
}

.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    font-family: inherit;
}

.contact-info {
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 3rem;
}

.contact-info h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-info p {
    margin-bottom: 0.5rem;
}

.contact-info a {
    color: var(--secondary-color);
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 3rem 20px 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-brand {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    font-weight: bold;
    font-size: 1.2rem;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    text-align: center;
    color: #bdc3c7;
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: 1rem;
    z-index: 10000;
    transform: translateY(100%);
    transition: var(--transition);
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-dismiss {
    background: var(--secondary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.cookie-dismiss:hover {
    background: #2980b9;
}

/* Utilities */
.hidden {
    display: none;
}

.text-center {
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        transition: var(--transition);
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .search-filter-grid {
        grid-template-columns: 1fr;
    }

    .book-detail-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .book-links {
        justify-content: center;
    }

    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 15px;
    }

    .featured-books,
    .categories-preview {
        padding: 2rem 15px;
    }

    .books-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}