/* ============================================
   ملف CSS الرئيسي لمنصة كتابي
   ============================================ */

/* ===== المتغيرات ===== */
:root {
    --primary: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #C8E6C9;
    --secondary: #2196F3;
    --secondary-dark: #1976D2;
    --success: #4CAF50;
    --danger: #f44336;
    --warning: #FF9800;
    --info: #00BCD4;
    --dark: #2C3E50;
    --gray: #95A5A6;
    --light-gray: #ECF0F1;
    --white: #FFFFFF;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Tajawal', sans-serif;
    background: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
}

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

a {
    text-decoration: none;
    color: var(--secondary);
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-dark);
}

/* ===== الهيدر ===== */
.site-header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 12px 0;
}

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

.header-logo a {
    font-size: 24px;
    font-weight: bold;
    color: var(--dark);
}

.header-logo a span {
    color: var(--primary);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-nav a {
    color: var(--dark);
    font-size: 15px;
    padding: 6px 12px;
    border-radius: 8px;
    transition: var(--transition);
}

.header-nav a:hover {
    background: var(--light-gray);
}

.notif-link {
    position: relative;
}

.notif-badge {
    position: absolute;
    top: -6px;
    right: -6px;
    background: var(--danger);
    color: white;
    border-radius: 50%;
    padding: 2px 6px;
    font-size: 11px;
    font-weight: bold;
}

.user-menu .user-avatar {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* ===== الأزرار ===== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

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

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

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

.btn-danger:hover {
    background: #d32f2f;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-lg {
    padding: 14px 32px;
    font-size: 18px;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

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

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

/* ===== التنبيهات ===== */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

/* ===== بطاقات الكتب ===== */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.book-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

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

.book-card-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.book-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    color: white;
}

.book-badge.gift { background: #4CAF50; }
.book-badge.swap { background: #2196F3; }
.book-badge.sale { background: #FF9800; }
.book-badge.academic { top: 45px; background: #9C27B0; }
.book-badge.general { top: 45px; background: #E91E63; }

.book-card-body {
    padding: 15px;
}

.book-title {
    font-size: 16px;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    color: var(--gray);
    font-size: 14px;
    margin-bottom: 8px;
}

.book-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--gray);
}

.book-price {
    font-weight: bold;
    color: var(--primary);
    margin-top: 8px;
}

.book-rating {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 14px;
    color: var(--gray);
}

/* ===== الحالة الفارغة ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.empty-state .empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.empty-state h3 {
    margin-bottom: 10px;
}

.empty-state p {
    color: var(--gray);
    margin-bottom: 20px;
}

/* ===== الترقيم ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.page-link {
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--white);
    border: 1px solid #dee2e6;
    color: var(--dark);
    transition: var(--transition);
}

.page-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-link.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== الفوتر ===== */
.site-footer {
    background: var(--dark);
    color: var(--white);
    padding: 40px 0 20px;
    margin-top: 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-col h4,
.footer-col h5 {
    margin-bottom: 15px;
}

.footer-col a {
    display: block;
    color: #bdc3c7;
    margin-bottom: 8px;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
    font-size: 14px;
}

/* ===== استجابة الجوال ===== */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .header-nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 20px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    
    .header-nav.open {
        display: flex;
    }
    
    .book-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 15px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .book-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .book-card-image {
        height: 160px;
    }
    
    .btn-lg {
        padding: 10px 20px;
        font-size: 16px;
    }
}