/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #00d4ff;
    --secondary-color: #0099cc;
    --accent-color: #00ff88;
    --background-dark: #0a0a0a;
    --background-card: #1a1a1a;
    --background-hover: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --border-color: #333333;
    --shadow: 0 4px 20px rgba(0, 212, 255, 0.1);
    --shadow-hover: 0 8px 30px rgba(0, 212, 255, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-family : 'Tajawal', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;

}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--background-dark) 0%, #0f1419 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
}

.course-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.course-title i {
    font-size: 2.2rem;
    color: var(--primary-color);
}

.course-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* Main Content */
.main-content {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

/* Search Section */
.search-section {
    margin-bottom: 3rem;
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.1rem;
}

#searchInput {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: var(--background-card);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    font-family: var(--font-family);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

#searchInput::placeholder {
    color: var(--text-muted);
}

/* Semester Tabs */
.semester-tabs {
    display: flex;
    gap: 0;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    background: var(--background-card);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: var(--shadow);
}

.semester-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius) - 4px);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    font-size: 1rem;
    font-family: var(--font-family);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    position: relative;
    min-width: 180px;
}

.semester-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    border-radius: calc(var(--border-radius) - 4px);
    transition: var(--transition);
    z-index: 0;
}

.semester-btn:hover::before {
    opacity: 0.15;
}

.semester-btn:hover {
    color: var(--text-primary);
    transform: translateY(-1px);
}

.semester-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.4);
    transform: translateY(-2px);
}

.semester-btn.active::before {
    opacity: 0;
}

.semester-btn i {
    position: relative;
    z-index: 1;
    font-size: 1.2rem;
    transition: var(--transition);
}

.semester-btn.active i {
    transform: scale(1.1);
}

.semester-btn span {
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
    letter-spacing: 0.3px;
}

/* Filter Buttons */
.filter-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--background-card);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    font-family: var(--font-family);
}

.filter-btn:hover {
    background: var(--background-hover);
    border-color: var(--primary-color);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--background-dark);
}

/* Materials Grid */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.material-card {
    height: 100%;
    background: var(--background-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: fadeIn 0.5s ease-in;
}

.material-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.material-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.material-card:hover::before {
    transform: scaleX(1);
}

.material-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.material-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.material-icon.lecture {
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
    color: white;
}

.material-icon.summary {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
    color: white;
}

.material-icon.practical {
    background: linear-gradient(135deg, #45b7d1, #96c93d);
    color: white;
}
.material-icon.exam {
    background: linear-gradient(135deg, #3498db, #5dade2);
    color: white;
}
.material-icon.code {
    background: linear-gradient(135deg, #2c3e50, #2980b9); /* من أزرق داكن إلى أزرق متوسط */
    color: white;
}
.material-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.material-type {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}
.materials-footer{
    margin-top: auto;
}
.material-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

/* تفاصيل الملف */
.file-details {
    margin-bottom: 1rem;
    
}

.file-info {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.file-size,
.file-type {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--background-hover);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.file-size i,
.file-type i {
    color: var(--primary-color);
    font-size: 0.9rem;
}

.download-btn {

    width: 100%;
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-family);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.3);
}

.download-btn:active {
    transform: translateY(0);
}

/* Footer */
.footer {
    background: var(--background-card);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .course-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .course-title i {
        font-size: 1.8rem;
    }
    
    .materials-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .materials-grid.has-no-results,
    .materials-grid:has(.no-results) {
        min-height: 50vh;
    }
    
    .no-results {
        padding: 3rem 1.5rem;
        max-width: 100%;
    }
    
    .no-results i {
        font-size: 3rem;
        margin-bottom: 1.25rem;
    }
    
    .no-results h3 {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    
    .no-results p {
        font-size: 1rem;
    }
    
    .semester-tabs {
        gap: 0;
        margin-bottom: 1.5rem;
        padding: 0.4rem;
        max-width: 100%;
    }
    
    .semester-btn {
        padding: 0.875rem 1rem;
        font-size: 0.95rem;
        min-width: 140px;
        gap: 0.5rem;
    }
    
    .semester-btn i {
        font-size: 1.1rem;
    }
    
    .filter-buttons {
        gap: 0.25rem;
    }
    
    .filter-btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    .material-card {
        padding: 1.25rem;
    }
    
    .main-content {
        padding: 2rem 0;
    }
}

@media (max-width: 480px) {
    .course-title {
        font-size: 1.75rem;
    }
    
    .course-subtitle {
        font-size: 1rem;
    }
    
    .search-box {
        margin-bottom: 1rem;
    }
    
    #searchInput {
        padding: 0.875rem 0.875rem 0.875rem 2.5rem;
        font-size: 0.95rem;
    }
    
    .search-box i {
        left: 0.75rem;
        font-size: 1rem;
    }
    
    .semester-tabs {
        gap: 0;
        margin-bottom: 1.25rem;
        padding: 0.3rem;
        flex-direction: column;
    }
    
    .semester-btn {
        padding: 0.875rem 1rem;
        font-size: 0.9rem;
        min-width: 100%;
        width: 100%;
        gap: 0.5rem;
    }
    
    .semester-btn i {
        font-size: 1rem;
    }
    
    .semester-btn span {
        font-size: 0.95rem;
    }
    
    .material-header {
        gap: 0.75rem;
    }
    
    .material-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }
    
    .material-info h3 {
        font-size: 1.1rem;
    }
    
    .file-info {
        gap: 0.5rem;
    }
    
    .file-size,
    .file-type {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }
    
    .materials-grid.has-no-results,
    .materials-grid:has(.no-results) {
        min-height: 40vh;
    }
    
    .no-results {
        padding: 2.5rem 1rem;
    }
    
    .no-results i {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .no-results h3 {
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
    }
    
    .no-results p {
        font-size: 0.95rem;
    }
}

/* Loading Animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* No Results Message */
.materials-grid.has-no-results {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    margin-top: 2rem;
}

.materials-grid:has(.no-results) {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    margin-top: 2rem;
}

.no-results {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    width: 100%;
    max-width: 500px;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.no-results i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    opacity: 0.6;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.no-results h3 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.no-results p {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
}