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

:root {
    --primary: #00f2ff;
    --secondary: #7b2ff7;
    --accent: #ff006e;
    --dark: #0a0e27;
    --darker: #060817;
    --light: #e0f7ff;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --success: #00ff88;
    --warning: #ffd700;
    --danger: #ff3366;
    --sidebar-width: 280px;
}

body {
    font-family: 'Cairo', sans-serif;
    background: var(--darker);
    color: var(--light);
    overflow-x: hidden;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.bg-animation::before,
.bg-animation::after {
    content: '';
    position: absolute;
    width: 800px;
    height: 800px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite alternate;
}

.bg-animation::before {
    background: radial-gradient(circle, var(--primary), transparent);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.bg-animation::after {
    background: radial-gradient(circle, var(--secondary), transparent);
    bottom: -200px;
    left: -200px;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(100px, 100px) scale(1.1); }
}

/* Grid Pattern */
.grid-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--glass-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--glass-border) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 1;
    pointer-events: none;
    opacity: 0.3;
}

/* Glass Card */
.glass-card {
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    opacity: 0;
    transition: opacity 0.4s;
}

.glass-card:hover::before {
    opacity: 1;
}

.glass-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 
        0 16px 48px rgba(0, 242, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Buttons */
.btn {
    padding: 14px 28px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: 'Cairo', sans-serif;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.4);
}

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

.btn-secondary {
    background: var(--glass);
    border: 1px solid var(--glass-border);
}

.btn-danger {
    background: linear-gradient(135deg, #ff3366, #ff006e);
}

.btn-success {
    background: linear-gradient(135deg, #00ff88, #00d4aa);
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--light);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-select {
    width: 100%;
    padding: 14px 18px;
    background: rgba(6, 8, 23, 0.95);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--light);
    font-size: 15px;
    font-family: 'Cairo', sans-serif;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
    -webkit-appearance: none;
    appearance: none;
}

/* ─── Select Dropdown Arrow ─── */
.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2300f2ff' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 14px center;
    padding-left: 40px;
    cursor: pointer;
}

/* ─── Option & Optgroup Colors (Cross-Browser) ─── */
.form-select option,
select option {
    background-color: #0a0e27 !important;
    color: #e0f7ff !important;
    font-family: 'Cairo', sans-serif;
    padding: 10px;
}

.form-select option:hover,
select option:hover,
.form-select option:checked,
select option:checked {
    background-color: rgba(0, 242, 255, 0.2) !important;
    color: #00f2ff !important;
}

.form-select optgroup,
select optgroup {
    background-color: #060817 !important;
    color: #00f2ff !important;
    font-weight: 800;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-select option:disabled,
select option:disabled {
    color: rgba(224, 247, 255, 0.3) !important;
}

/* فلاتر inline بأي مكان */
select:not(.form-select) {
    background-color: rgba(6, 8, 23, 0.95) !important;
    color: #e0f7ff !important;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-family: 'Cairo', sans-serif;
    padding: 10px 14px;
}

select:not(.form-select) option {
    background-color: #0a0e27 !important;
    color: #e0f7ff !important;
}

/* Date inputs */
input[type="date"],
input[type="time"] {
    background: rgba(6, 8, 23, 0.95) !important;
    color: var(--light) !important;
    color-scheme: dark;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(0, 242, 255, 0.3);
    transform: translateY(-2px);
}

/* Badge */
.badge {
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-block;
}

.badge-success {
    background: rgba(0, 255, 136, 0.2);
    color: var(--success);
    border: 1px solid var(--success);
}

.badge-warning {
    background: rgba(255, 215, 0, 0.2);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.badge-danger {
    background: rgba(255, 51, 102, 0.2);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.badge-info {
    background: rgba(0, 242, 255, 0.2);
    color: var(--primary);
    border: 1px solid var(--primary);
}

/* Alert */
.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    border-left: 4px solid;
    backdrop-filter: blur(10px);
    animation: slideInRight 0.5s ease-out;
}

.alert-warning {
    background: rgba(255, 215, 0, 0.1);
    border-color: var(--warning);
    color: var(--warning);
}

.alert-danger {
    background: rgba(255, 51, 102, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.alert-info {
    background: rgba(0, 242, 255, 0.1);
    border-color: var(--primary);
    color: var(--primary);
}

.alert-success {
    background: rgba(0, 255, 136, 0.1);
    border-color: var(--success);
    color: var(--success);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--dark);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 32px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    animation: scaleIn 0.3s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.close-btn {
    background: none;
    border: none;
    color: var(--light);
    font-size: 28px;
    cursor: pointer;
    transition: all 0.3s;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.close-btn:hover {
    background: var(--glass);
    transform: rotate(90deg);
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Table */
.table-container {
    overflow-x: auto;
    margin-bottom: 32px;
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
}

.data-table thead th {
    padding: 16px;
    text-align: right;
    font-weight: 700;
    color: var(--light);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
    background: var(--glass);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 5;
}

.data-table thead th:first-child {
    border-radius: 12px 0 0 12px;
}

.data-table thead th:last-child {
    border-radius: 0 12px 12px 0;
}

.data-table tbody tr {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    transition: all 0.3s;
    cursor: pointer;
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(-4px);
    box-shadow: 0 4px 16px rgba(0, 242, 255, 0.2);
}

.data-table tbody td {
    padding: 16px;
    color: var(--light);
}

.data-table tbody tr td:first-child {
    border-radius: 12px 0 0 12px;
}

.data-table tbody tr td:last-child {
    border-radius: 0 12px 12px 0;
}

/* Student Photo */
.student-photo {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
    box-shadow: 0 0 20px rgba(0, 242, 255, 0.3);
}

/* Stats Card */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    padding: 24px;
    background: var(--glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    transition: all 0.4s;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--primary), transparent);
    opacity: 0.1;
    border-radius: 50%;
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.2);
}

.stat-label {
    font-size: 14px;
    color: var(--light);
    opacity: 0.7;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 36px;
    font-weight: 800;
    font-family: 'Orbitron', sans-serif;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* File Upload */
.file-upload {
    position: relative;
    display: inline-block;
    width: 100%;
}

.file-upload-input {
    display: none;
}

.file-upload-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 48px 24px;
    border: 2px dashed var(--glass-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--glass);
    color: var(--light);
}

.file-upload-label:hover {
    border-color: var(--primary);
    background: rgba(0, 242, 255, 0.05);
    transform: translateY(-2px);
}

.file-preview {
    margin-top: 16px;
    text-align: center;
}

.file-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 12px;
    border: 2px solid var(--primary);
    box-shadow: 0 8px 24px rgba(0, 242, 255, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .glass-card {
        padding: 20px;
    }

    .modal-content {
        padding: 24px;
    }
}

/* ═══════════════════════════════════════════
   Image Upload Enhanced (Base64 - No CORS)
   ═══════════════════════════════════════════ */

/* منطقة رفع الصورة المحسّنة */
.file-upload-label {
    flex-direction: column;
    gap: 8px;
    text-align: center;
}

.file-upload-label .upload-icon {
    font-size: 36px;
    margin-bottom: 4px;
    transition: transform 0.3s;
}

.file-upload-label:hover .upload-icon {
    transform: scale(1.1) translateY(-4px);
}

.file-upload-label .upload-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--light);
}

.file-upload-label .upload-hint {
    font-size: 12px;
    opacity: 0.5;
}

/* معاينة الصورة بعد الاختيار */
.file-preview {
    margin-top: 16px;
    text-align: center;
    animation: fadeIn 0.4s ease-out;
}

.file-preview img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 14px;
    border: 2px solid var(--primary);
    box-shadow: 0 4px 20px rgba(0, 242, 255, 0.35);
}

/* شريط نجاح الرفع */
.upload-success-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding: 8px 14px;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--success);
    border-radius: 10px;
    font-size: 12px;
    color: var(--success);
    font-weight: 600;
}

/* رسالة خطأ الرفع */
.upload-error-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding: 8px 14px;
    background: rgba(255, 51, 102, 0.1);
    border: 1px solid var(--danger);
    border-radius: 10px;
    font-size: 12px;
    color: var(--danger);
    font-weight: 600;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE COMPONENTS — All Screens
   ═══════════════════════════════════════════════════════ */

/* ─── Modal Sheet on Mobile ─── */
@media (max-width: 767px) {
    .modal {
        align-items: flex-end;
        padding: 0;
    }
    .modal-content {
        border-bottom-left-radius: 0 !important;
        border-bottom-right-radius: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        margin: 0 !important;
        max-height: 92vh;
        overflow-y: auto;
        padding: 22px 18px 32px !important;
    }
    .modal-header { margin-bottom: 16px; }
    .modal-title  { font-size: 18px !important; }
}

/* ─── Stats Grid ─── */
@media (max-width: 767px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr !important;
        gap: 10px !important;
    }
    .stat-card { padding: 16px !important; }
    .stat-value { font-size: 26px !important; }
    .stat-label { font-size: 11px !important; }
}

/* ─── Two-column form grids collapse on mobile ─── */
@media (max-width: 600px) {
    [style*="grid-template-columns: 1fr 1fr"],
    [style*="grid-template-columns:1fr 1fr"],
    [style*="repeat(2, 1fr)"],
    [style*="repeat(3, 1fr)"],
    [style*="repeat(4, 1fr)"] {
        grid-template-columns: 1fr !important;
    }
}

/* ─── Page title responsive ─── */
@media (max-width: 767px) {
    .page-title { font-size: 22px !important; }
    .page-subtitle { font-size: 13px; }
    .page-header { margin-bottom: 18px; }
}
@media (max-width: 479px) {
    .page-title { font-size: 18px !important; }
}

/* ─── Search bar full width on mobile ─── */
@media (max-width: 767px) {
    .search-bar { max-width: 100% !important; width: 100%; }
    .top-bar { flex-direction: column; gap: 10px; padding: 14px; }
}

/* ─── Glass card padding ─── */
@media (max-width: 767px) {
    .glass-card { padding: 18px !important; border-radius: 18px !important; }
}

/* ─── Badge sizes ─── */
@media (max-width: 479px) {
    .badge { font-size: 10px !important; padding: 3px 7px !important; }
}

/* ─── Hide decorative elements on small screens ─── */
@media (max-width: 479px) {
    .bg-animation::before,
    .bg-animation::after { width: 400px; height: 400px; }
    .grid-pattern { background-size: 40px 40px; }
}

/* ─── Touch improvements ─── */
@media (hover: none) {
    .nav-link:hover { transform: none; }
    .btn:hover { transform: none; }
    .glass-card:hover { transform: none; }
}

/* ─── Scrollable table wrapper ─── */
.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 12px;
}
.table-container::-webkit-scrollbar { height: 4px; }
.table-container::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 10px; }