/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

:root {
    /* Colors - High Contrast UI */
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --secondary: #e81cff;
    --success: #059669;
    --warning: #ea580c;
    --danger: #e11d48;
    --info: #2563eb;

    /* Grays */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #9333ea 50%, #db2777 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #047857 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #b45309 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Spacing */
    /* Spacing - Increased for better breathing room */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 50%, #fdf4ff 100%); /* Colorful light mesh */
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============================================================================
   DEMO BANNER
   ============================================================================ */

.demo-banner {
    background: var(--gradient-primary);
    color: white;
    padding: 12px 20px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.demo-banner-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.demo-icon {
    font-size: 20px;
}

.demo-text {
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 1px;
}

.demo-description {
    font-size: 14px;
    opacity: 0.9;
}

/* ============================================================================
   PAGES & LAYOUT
   ============================================================================ */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

.dashboard-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
}

.page {
    display: none;
    min-height: 100vh;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================================
   LOGIN & REGISTER
   ============================================================================ */

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.login-card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    width: 100%;
    max-width: 480px;
    animation: scaleIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.login-header h1 {
    font-size: 1.875rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--gray-600);
    font-size: 1rem;
}

/* ============================================================================
   FORMS
   ============================================================================ */

.auth-form {
    margin-bottom: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--gray-500);
    font-size: 0.875rem;
}

.form-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    color: var(--gray-600);
}

.form-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.form-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
    border: none;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.6);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: #1e293b;
    border: 1px solid #cbd5e1;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.btn-secondary:hover:not(:disabled) {
    background: #ffffff;
    border-color: #94a3b8;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
    border: none;
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.6);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
    border: none;
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.6);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ============================================================================
   DEMO ACCOUNTS
   ============================================================================ */

.demo-accounts-section {
    margin-top: var(--spacing-xl);
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--gray-200);
}

.divider span {
    padding: 0 var(--spacing-md);
    color: var(--gray-500);
    font-size: 0.875rem;
    font-weight: 600;
}

.demo-accounts-grid {
    display: grid;
    gap: var(--spacing-sm);
}

.demo-account-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.demo-account-btn:hover {
    background: var(--gray-100);
    border-color: var(--primary);
    transform: translateX(4px);
}

.demo-account-icon {
    font-size: 1.5rem;
}

.demo-account-info {
    flex: 1;
}

.demo-account-name {
    font-weight: 600;
    color: var(--gray-900);
    display: block;
}

.demo-account-email {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ============================================================================
   NAVBAR
   ============================================================================ */

.navbar {
    background: linear-gradient(135deg, #4f46e5 0%, #db2777 100%);
    box-shadow: 0 10px 25px -5px rgba(219, 39, 119, 0.4);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    color: white;
}

.navbar-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2.5rem 2rem 2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

/* OVERRIDE INLINE CACHED HTML STYLES */
#class-detail-header {
    background: linear-gradient(135deg, #4f46e5 0%, #a855f7 50%, #ec4899 100%) !important;
    padding: 3.5rem 2rem !important;
    border-radius: 1.5rem !important;
    color: #ffffff !important;
    text-align: center !important;
    box-shadow: 0 20px 25px -5px rgba(168, 85, 247, 0.4) !important;
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(255,255,255,0.2) !important;
}

#class-detail-name, #class-detail-header h1 {
    color: #ffffff !important;
    font-size: 3rem !important;
    font-weight: 900 !important;
    text-shadow: 0 4px 6px rgba(0,0,0,0.3) !important;
    margin-bottom: 1.5rem !important;
}

.class-detail-metrics {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1.5rem;
}

.metric-box {
    background: rgba(0, 0, 0, 0.25) !important;
    backdrop-filter: blur(12px) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    padding: 1.25rem 2.5rem !important;
    border-radius: 1rem !important;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.2) !important;
}

.metric-label {
    color: #cbd5e1 !important;
    font-weight: 700 !important;
    letter-spacing: 1.5px !important;
    font-size: 0.875rem !important;
    text-transform: uppercase !important;
    margin-bottom: 0.5rem !important;
}

.metric-value {
    color: #ffffff !important;
    text-shadow: 0 2px 4px rgba(0,0,0,0.4) !important;
    font-size: 2rem !important;
    font-weight: 800 !important;
}

.navbar-brand h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.navbar-user span {
    font-weight: 600;
    color: var(--gray-700);
}

/* ============================================================================
   DASHBOARD
   ============================================================================ */

.tab-container {
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

/* ============================================================================
   ASSIGNMENTS GRID
   ============================================================================ */

.assignments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.assignment-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-lg);
    transition: var(--transition);
    border: 2px solid transparent;
}

.assignment-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary);
}

.assignment-header {
    margin-bottom: var(--spacing-md);
}

.assignment-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.assignment-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.assignment-description {
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.assignment-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.status-submitted {
    background: var(--info);
    color: white;
}

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

.status-pending {
    background: var(--warning);
    color: white;
}

.status-needs-retake {
    background: var(--danger);
    color: white;
}

.assignment-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ============================================================================
   TABS
   ============================================================================ */

.teacher-tabs {
    display: inline-flex;
    gap: 0.5rem;
    margin-bottom: var(--spacing-xl);
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    backdrop-filter: blur(10px);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-600);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-btn:hover {
    color: #4f46e5;
    background: rgba(79, 70, 229, 0.08);
}

.tab-btn.active {
    color: #ffffff !important;
    background: linear-gradient(135deg, #4f46e5 0%, #db2777 100%) !important;
    box-shadow: 0 4px 15px rgba(219, 39, 119, 0.3) !important;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

/* ============================================================================
   CLASSES GRID
   ============================================================================ */

.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.class-card {
    background: linear-gradient(135deg, #ffffff 0%, #fef2f2 50%, #f0fdf4 100%);
    border-radius: 1.5rem;
    box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.15);
    padding: 2.5rem 2rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
}

.class-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 8px;
    background: linear-gradient(90deg, #ec4899, #8b5cf6, #10b981, #3b82f6);
}

.class-card:hover {
    box-shadow: 0 25px 40px -10px rgba(79, 70, 229, 0.3);
    transform: translateY(-8px) scale(1.01);
}

.class-code {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0e7ff 100%);
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    font-family: monospace;
    font-size: 1.25rem;
    color: #4f46e5;
    font-weight: 900;
    letter-spacing: 3px;
    text-align: center;
    border: 1px dashed #a5b4fc;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.class-info-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-xl);
    border: 1px solid var(--gray-200);
}
.class-info-card .label {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}
.class-info-card .value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.class-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.class-info {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* ============================================================================
   STATS GRID
   ============================================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.15);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(99, 102, 241, 0.1);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    bottom: -50px;
    right: -50px;
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    opacity: 0.1;
    border-radius: 50%;
    filter: blur(20px);
}

.stat-card:hover {
    box-shadow: 0 15px 30px -5px rgba(59, 130, 246, 0.3);
    transform: translateY(-6px) scale(1.02);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--gray-600);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

/* ============================================================================
   AUDIT LOGS
   ============================================================================ */

.audit-logs-section {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--spacing-xl);
}

.audit-logs-section h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
    font-weight: 700;
}

.audit-logs-table {
    max-height: 500px;
    overflow-y: auto;
}

.audit-log-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-md);
    align-items: center;
}

.audit-log-item:last-child {
    border-bottom: none;
}

.audit-log-action {
    font-weight: 600;
    color: var(--gray-900);
}

.audit-log-details {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.audit-log-time {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ============================================================================
   MODALS
   ============================================================================ */

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: block;
    animation: fadeIn 0.2s ease-out;
}

.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1001;
    max-height: 90vh;
    overflow-y: auto;
}

.modal.active {
    display: block;
    animation: modalSlideIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 95vw;
    max-width: 700px;
}

.modal-large {
    max-width: 1000px;
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.modal-close:not(.btn) {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.modal-body {
    padding: var(--spacing-xl);
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    flex-wrap: wrap;
}

.modal-footer .btn {
    flex-shrink: 0;
}

/* ============================================================================
   CAMERA & IMAGE PREVIEW
   ============================================================================ */

.camera-container {
    text-align: center;
}

.image-preview {
    margin-top: var(--spacing-lg);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.image-preview img {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================================================
   ALERTS
   ============================================================================ */

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

.alert-warning {
    background: #fef3c7;
    border: 1px solid #fbbf24;
    color: #92400e;
}

.alert strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ============================================================================
   GRADING LAYOUT
   ============================================================================ */

.grading-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .grading-layout {
        grid-template-columns: 1fr;
        /* Stack vertically on smaller screens */
    }
}

.submission-view h4,
.grading-panel h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.submission-image {
    width: 100%;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.extracted-text-section {
    margin-top: var(--spacing-lg);
}

.extracted-text {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.ai-suggestion-box {
    background: linear-gradient(135deg, #e0e7ff 0%, #ddd6fe 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.ai-score {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.score-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.ai-confidence {
    font-size: 0.875rem;
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.ai-reasoning {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

/* ============================================================================
   RUBRIC
   ============================================================================ */

.rubric-item {
    display: grid;
    grid-template-columns: 1fr 100px auto;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.criterion-name {
    flex: 1;
}

.criterion-points {
    width: 100px;
}

/* ============================================================================
   TOAST NOTIFICATIONS
   ============================================================================ */

.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: toastSlideIn 0.3s ease-out;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-error {
    border-left: 4px solid var(--danger);
}

.toast-info {
    border-left: 4px solid var(--info);
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */

@media (max-width: 768px) {
    .grading-layout {
        grid-template-columns: 1fr;
    }

    .navbar {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .modal-content {
        width: 95vw;
    }
}

/* ============================================================================
   LOADING STATES
   ============================================================================ */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================================================
   UTILITIES
   ============================================================================ */

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

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mt-4 {
    margin-top: var(--spacing-xl);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.mb-4 {
    margin-bottom: var(--spacing-xl);
}

/* ============================================================================
   BADGE SYSTEM
   ============================================================================ */

.badge-card {
    background: white;
    padding: 1.5rem;
    border-radius: 1rem;
    text-align: center;
    border: 1px dashed var(--gray-300);
    color: var(--gray-400);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.badge-card .badge-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    filter: grayscale(1);
    transition: filter 0.3s, transform 0.3s;
}

.badge-card .badge-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--gray-500);
}

.badge-card .badge-desc {
    font-size: 0.75rem;
    line-height: 1.3;
    color: var(--gray-400);
}

.badge-card .lock-indicator {
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 0.8rem;
    opacity: 0.5;
}

/* Unlocked Badge Styling */
.badge-unlocked {
    border: 2px solid var(--primary);
    background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.1), 0 2px 4px -1px rgba(59, 130, 246, 0.06);
}

.badge-unlocked .badge-icon {
    filter: none;
    transform: scale(1.1);
}

.badge-unlocked .badge-title {
    color: var(--gray-800);
}

.badge-unlocked .badge-desc {
    color: var(--gray-600);
}

.unlocked-indicator {
    opacity: 1 !important;
}
/* ============================================================================
   DASHBOARD LAYOUT (STATS & AUDIT)
   ============================================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
    width: 100%;
}

.stat-card {
    background: white !important;
    padding: var(--spacing-xl) !important;
    border-radius: var(--radius-xl) !important;
    box-shadow: var(--shadow-lg) !important;
    border: 1px solid var(--gray-100) !important;
    text-align: center;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl) !important;
    border-color: var(--primary) !important;
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    background: var(--gray-50);
    width: 70px;
    height: 70px;
    display: flex !important;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary) !important;
    line-height: 1.1;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.stat-label {
    font-weight: 600;
    color: var(--gray-500) !important;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
}

.audit-logs-section {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-100);
    margin-top: var(--spacing-2xl);
}

.audit-logs-section h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    color: var(--gray-900);
}

.audit-log-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-100);
    gap: var(--spacing-xl);
}

.audit-log-item:last-child {
    border-bottom: none;
}

.audit-log-action {
    font-weight: 800;
    color: var(--primary);
    font-size: 0.875rem;
    background: var(--gray-50);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    min-width: 140px;
    text-align: center;
}

.audit-log-details {
    color: var(--gray-700);
    font-weight: 500;
}

.audit-log-time {
    color: var(--gray-500);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .audit-log-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: left;
    }
    
    .audit-log-action {
        display: inline-block;
        width: fit-content;
    }
}