/* 📱 Mobile App-Like Improvements */

/* ===== Global Mobile Enhancements ===== */
@media (max-width: 768px) {
    /* تصغير الخطوط للموبايل */
    body {
        font-size: 14px;
        line-height: 1.5;
    }
    
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.3rem; }
    h3 { font-size: 1.1rem; }
    h4 { font-size: 1rem; }
    
    /* تقليل المسافات */
    .container {
        padding: 0.75rem !important;
    }
    
    .card {
        margin-bottom: 0.75rem;
        border-radius: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    /* تحسين الأزرار */
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        border-radius: 0.75rem;
    }
    
    /* تحسين Forms */
    .form-control {
        font-size: 0.95rem;
        padding: 0.65rem 0.75rem;
        border-radius: 0.75rem;
    }
    
    .form-group {
        margin-bottom: 0.75rem;
    }
    
    /* تحسين Tables */
    table {
        font-size: 0.85rem;
    }
    
    table th,
    table td {
        padding: 0.5rem;
    }
}

/* ===== Background Pattern Overlay ===== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.03) 0%, transparent 50%),
        linear-gradient(135deg, rgba(102, 126, 234, 0.02) 0%, rgba(118, 75, 162, 0.02) 100%);
    pointer-events: none;
    z-index: -1;
}

/* ===== Subject Icons System ===== */
.subject-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    color: white;
    background: linear-gradient(135deg, var(--gradient-from), var(--gradient-to));
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.subject-icon:hover {
    transform: translateY(-2px);
}

/* Subject Colors */
.subject-math {
    --gradient-from: #667eea;
    --gradient-to: #764ba2;
}

.subject-physics {
    --gradient-from: #f093fb;
    --gradient-to: #f5576c;
}

.subject-chemistry {
    --gradient-from: #4facfe;
    --gradient-to: #00f2fe;
}

.subject-biology {
    --gradient-from: #43e97b;
    --gradient-to: #38f9d7;
}

.subject-english {
    --gradient-from: #fa709a;
    --gradient-to: #fee140;
}

.subject-arabic {
    --gradient-from: #30cfd0;
    --gradient-to: #330867;
}

.subject-history {
    --gradient-from: #ff9a56;
    --gradient-to: #ff6a88;
}

.subject-geography {
    --gradient-from: #a8edea;
    --gradient-to: #fed6e3;
}

.subject-computer {
    --gradient-from: #667eea;
    --gradient-to: #764ba2;
}

.subject-islamic {
    --gradient-from: #21d4fd;
    --gradient-to: #b721ff;
}

.subject-default {
    --gradient-from: #667eea;
    --gradient-to: #764ba2;
}

/* ===== Material Card Design ===== */
.material-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: all 0.3s;
    margin-bottom: 0.75rem;
    border: 1px solid #f0f0f0;
}

.material-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.15);
}

.material-card .subject-icon {
    flex-shrink: 0;
}

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

.material-title {
    font-weight: 600;
    font-size: 1rem;
    margin: 0 0 0.25rem 0;
    color: #1f2937;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.material-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: #6b7280;
}

.material-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .material-card {
        padding: 0.75rem;
    }
    
    .material-title {
        font-size: 0.9rem;
    }
    
    .material-meta {
        flex-direction: column;
        gap: 0.25rem;
        font-size: 0.8rem;
    }
    
    .subject-icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
        border-radius: 10px;
    }
}

/* ===== App-Like Page Headers ===== */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.2);
}

.page-header h1 {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 700;
}

.page-header p {
    margin: 0.5rem 0 0 0;
    opacity: 0.9;
    font-size: 0.95rem;
}

@media (max-width: 768px) {
    .page-header {
        padding: 1rem;
        border-radius: 0.75rem;
        margin-bottom: 1rem;
    }
    
    .page-header h1 {
        font-size: 1.3rem;
    }
    
    .page-header p {
        font-size: 0.85rem;
    }
}

/* ===== Improved Course Cards ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.course-card-modern {
    background: white;
    border-radius: 1.25rem;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s;
    border: 1px solid #f0f0f0;
}

.course-card-modern:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(102, 126, 234, 0.15);
}

.course-image-wrapper {
    position: relative;
    width: 100%;
    height: 160px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.course-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: rgba(255, 255, 255, 0.95);
    padding: 0.35rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #667eea;
}

.course-content {
    padding: 1.25rem;
}

.course-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: #1f2937;
}

.course-description {
    font-size: 0.9rem;
    color: #6b7280;
    margin: 0 0 1rem 0;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid #f0f0f0;
}

.course-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: #6b7280;
}

@media (max-width: 768px) {
    .course-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin: 1rem 0;
    }
    
    .course-card-modern {
        border-radius: 1rem;
    }
    
    .course-image-wrapper {
        height: 140px;
    }
    
    .course-content {
        padding: 1rem;
    }
    
    .course-title {
        font-size: 1rem;
    }
}