/* ===== CSS Variables ===== */
:root {
    --bg: #faf8f5;
    --bg-alt: #f3f0eb;
    --text: #2c2c2c;
    --text-secondary: #6b6b6b;
    --primary: #6C63FF;
    --primary-dark: #5a52d5;
    --primary-light: #8b83ff;
    --border: #e8e4de;
    --card-bg: #ffffff;
    --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
    --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.1);
    --header-bg: rgba(250,248,245,0.95);
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Merriweather', Georgia, serif;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg: #1a1a1f;
    --bg-alt: #242428;
    --text: #e0ddd8;
    --text-secondary: #9a978f;
    --border: #333338;
    --card-bg: #242428;
    --card-shadow: 0 2px 12px rgba(0,0,0,0.3);
    --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.4);
    --header-bg: rgba(26,26,31,0.95);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(108, 99, 255, 0.08);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-toggle, .theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.search-toggle:hover, .theme-toggle:hover {
    background: var(--bg-alt);
    color: var(--text);
}

.theme-toggle .moon-icon { display: none; }
[data-theme="dark"] .theme-toggle .sun-icon { display: none; }
[data-theme="dark"] .theme-toggle .moon-icon { display: block; }

/* Mobile menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border: none;
    background: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Search Overlay ===== */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 120px;
}

.search-overlay.active {
    display: flex;
}

.search-overlay-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 8px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    position: relative;
}

.search-overlay-content input {
    width: 100%;
    padding: 16px 48px 16px 20px;
    border: none;
    background: none;
    font-size: 1.1rem;
    color: var(--text);
    outline: none;
    font-family: var(--font-body);
}

.search-close {
    position: absolute;
    right: 16px;
    top: 16px;
    border: none;
    background: none;
    color: var(--text-secondary);
    cursor: pointer;
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
    border-top: 1px solid var(--border);
}

.search-results:empty {
    border-top: none;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.search-result-item:hover {
    background: var(--bg-alt);
}

.search-result-cover {
    width: 40px;
    height: 56px;
    border-radius: 4px;
    flex-shrink: 0;
}

.search-result-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
}

.search-result-info span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ===== Hero Section ===== */
.hero {
    padding: 80px 0;
    overflow: hidden;
}

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

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    color: var(--primary);
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-alt);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat strong {
    display: block;
    font-size: 1.5rem;
    font-family: var(--font-heading);
    color: var(--primary);
}

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

/* ===== Sections ===== */
.section {
    padding: 60px 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
}

.text-center {
    text-align: center;
    margin-bottom: 40px;
}

.view-all {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.view-all:hover {
    gap: 8px;
}

/* ===== Book Grid ===== */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 24px;
}

.book-grid-library {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

.book-card {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: var(--transition);
}

.book-card:hover {
    transform: translateY(-4px);
}

.book-card-cover {
    aspect-ratio: 2/3;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 16px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.book-card-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.book-card:hover .book-card-cover {
    box-shadow: var(--card-hover-shadow);
}

.book-card-cover .book-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6), transparent);
    z-index: 1;
}

.book-card-cover .book-cover-title {
    position: relative;
    z-index: 1;
    color: white;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    line-height: 1.3;
}

.book-card-cover .book-cover-author {
    position: relative;
    z-index: 1;
    color: rgba(255,255,255,0.8);
    font-size: 0.7rem;
    margin-top: 4px;
}

.book-card-info {
    padding: 10px 2px;
}

.book-card-info h3 {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 2px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card-info .book-author {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.book-card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    flex-wrap: wrap;
}

.book-card-info .book-genre-tag {
    display: inline-block;
    font-size: 0.7rem;
    color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
    padding: 2px 8px;
    border-radius: 20px;
}

.book-reading-time {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* ===== Continue Reading Section ===== */
.continue-reading {
    padding: 32px 0 0;
}

.continue-reading-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.continue-reading-card:hover {
    border-color: var(--primary);
    box-shadow: var(--card-hover-shadow);
}

.continue-reading-cover {
    width: 60px;
    height: 90px;
    border-radius: 6px;
    flex-shrink: 0;
    overflow: hidden;
    position: relative;
}

.continue-reading-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.continue-reading-info {
    flex: 1;
    min-width: 0;
}

.continue-reading-info h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.continue-reading-info .book-author {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.continue-reading-progress {
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    max-width: 200px;
}

.continue-reading-progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    transition: width 0.3s;
}

.continue-reading-percent {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.continue-reading-cta {
    flex-shrink: 0;
}

.read-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    padding: 6px 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

/* ===== Genre Grid ===== */
.genre-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.genre-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.genre-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--card-hover-shadow);
}

.genre-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.genre-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.genre-card span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Genre Page Grid */
.genres-page-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.genre-page-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.genre-page-card:hover {
    border-color: var(--accent, var(--primary));
    box-shadow: var(--card-hover-shadow);
    transform: translateX(4px);
}

.genre-page-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.genre-page-info {
    flex: 1;
}

.genre-page-info h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.genre-page-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.genre-page-count {
    display: inline-block;
    margin-top: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent, var(--primary));
}

.genre-arrow {
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* ===== Steps Grid ===== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step-card {
    text-align: center;
    padding: 32px 24px;
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0 auto 16px;
}

.step-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Newsletter ===== */
.newsletter-section {
    padding: 80px 0;
}

.newsletter-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius);
    padding: 48px;
    text-align: center;
    color: white;
}

.newsletter-card h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.newsletter-card p {
    opacity: 0.9;
    margin-bottom: 24px;
}

.newsletter-form {
    display: flex;
    gap: 8px;
    max-width: 440px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-body);
    outline: none;
}

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

.newsletter-form .btn-primary:hover {
    background: #f0f0f0;
}

/* ===== Page Header ===== */
.page-header {
    padding: 48px 0 32px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 8px;
}

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

/* ===== Library Controls ===== */
.library-controls {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.library-search {
    flex: 1;
    min-width: 250px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.library-search input {
    flex: 1;
    border: none;
    background: none;
    font-size: 0.95rem;
    color: var(--text);
    outline: none;
    font-family: var(--font-body);
}

.library-search svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.library-filters {
    display: flex;
    gap: 8px;
}

.library-filters select {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
}

.library-results-info {
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about p {
    margin-top: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.footer-links a {
    display: block;
    padding: 4px 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* ===== Loading Spinner ===== */
.loading-spinner {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-menu-toggle { display: flex; }

    .nav.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--header-bg);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        padding: 16px;
        gap: 4px;
    }

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

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

    .hero-content p {
        max-width: 100%;
    }

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

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

    .steps-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .genre-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .book-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .newsletter-card {
        padding: 32px 20px;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .library-controls {
        flex-direction: column;
    }

    .library-filters {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.6rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .hero-actions {
        flex-direction: column;
        gap: 8px;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .book-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .genre-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .search-overlay {
        padding-top: 60px;
    }

    .search-toggle, .theme-toggle {
        width: 44px;
        height: 44px;
    }

    .newsletter-card {
        padding: 24px 16px;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .continue-reading-card {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .continue-reading-cta {
        width: 100%;
    }

    .continue-reading-cta .btn {
        width: 100%;
        justify-content: center;
    }
}