/* ========================================
   BASE
   ======================================== */
:root {
    --primary: #007bff;
    --secondary: #6c757d;
    --success: #28a745;
    --light: #f8f9fa;
    --dark: #343a40;
    --text: #333;
    --text-muted: #666;
    --border: #ddd;
}

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

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: #fff;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ========================================
   LAYOUT
   ======================================== */
.pb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.pb-section {
    padding: 60px 20px;
}

.pb-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.pb-grid-center {
    justify-content: center;
}

.pb-grid-between {
    justify-content: space-between;
}

.pb-grid-column {
    flex-direction: column;
}

.pb-column {
    flex: 1;
    min-width: 0;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
.pb-text {
    margin-bottom: 16px;
}

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

.pb-text-muted {
    color: var(--text-muted);
}

/* ========================================
   BUTTONS
   ======================================== */
.pb-button {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.pb-button:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.pb-button-large {
    padding: 16px 32px;
    font-size: 18px;
}

.pb-button-outline {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.pb-button-outline:hover {
    background: var(--primary);
    color: white;
}

/* ========================================
   HERO SECTION
   ======================================== */
.pb-section-hero {
    background: var(--light);
    text-align: center;
    padding: 80px 20px;
}

/* ========================================
   BOOK GRID
   ======================================== */
.pb-book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.pb-book-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition:
        transform 0.3s,
        box-shadow 0.3s;
}

.pb-book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.pb-book-cover {
    width: 100%;
    height: 300px;
    object-fit: cover;
    background: #f0f0f0;
}

.pb-book-info {
    padding: 16px;
}

.pb-book-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.pb-book-author {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.pb-book-btn {
    width: 100%;
    text-align: center;
}

.pb-load-more-container {
    text-align: center;
    margin-top: 40px;
}

/* ========================================
   PUBLISHER SECTION
   ======================================== */
.pb-publisher-info {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
}

.pb-publisher-info .pb-column {
    flex: 1;
    min-width: 300px;
}

/* ========================================
   NEWSLETTER SECTION
   ======================================== */
.pb-section-newsletter {
    background: var(--primary);
    color: white;
    text-align: center;
}

.pb-section-newsletter .pb-text {
    color: white;
}

/* ========================================
   CATEGORIES SECTION
   ======================================== */
.pb-category-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
}

.pb-category-btn {
    background: white;
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: 20px;
    color: var(--text);
    transition: all 0.3s;
}

.pb-category-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .pb-section {
        padding: 40px 15px;
    }

    .pb-section-hero {
        padding: 60px 15px;
    }

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

    .pb-book-cover {
        height: 240px;
    }

    .pb-publisher-info {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .pb-book-grid {
        grid-template-columns: 1fr;
    }

    .pb-button-large {
        padding: 14px 24px;
        font-size: 16px;
    }
}