/**
 * Rivers Academy - Tutoring App Styles
 * Color Scheme: Deep Blue, Teal, Gold accents on light background
 */

/* ==================== CSS Variables ==================== */
:root {
    /* Primary Colors */
    --primary-dark: #1a365d;
    --primary: #2c5282;
    --primary-light: #4299e1;

    /* Secondary Colors (Teal) */
    --secondary-dark: #234e52;
    --secondary: #319795;
    --secondary-light: #4fd1c5;

    /* Accent Colors (Gold) */
    --accent-dark: #975a16;
    --accent: #d69e2e;
    --accent-light: #f6e05e;

    /* Status Colors */
    --success: #38a169;
    --success-light: #c6f6d5;
    --warning: #dd6b20;
    --warning-light: #feebc8;
    --danger: #e53e3e;
    --danger-light: #fed7d7;
    --info: #3182ce;
    --info-light: #bee3f8;

    /* Neutral Colors */
    --gray-50: #f7fafc;
    --gray-100: #edf2f7;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #a0aec0;
    --gray-500: #718096;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --gray-900: #171923;

    /* Typography */
    --font-heading: 'Merriweather', Georgia, serif;
    --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
}

/* ==================== Reset & Base ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-700);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary-dark);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 1.6rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

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

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

/* ==================== Header ==================== */
.main-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    color: white;
    font-size: 1.4rem;
    margin: 2px 0 0 0;
}

.logo .tagline {
    font-size: 0.75rem;
    opacity: 0.9;
    font-style: italic;
    margin-top: -2px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    line-height: 1.3;
}

.user-welcome {
    font-weight: 600;
    font-size: 0.9rem;
}

.user-role {
    opacity: 0.9;
    font-size: 0.75rem;
    font-style: italic;
}

.user-roles {
    color: var(--gray-500);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    font-style: italic;
}

.page-header .user-roles {
    margin-top: 0;
}

/* ==================== Footer ==================== */
.main-footer {
    background: var(--primary-dark);
    color: white;
    padding: var(--spacing-sm) var(--spacing-xl);
    text-align: center;
    margin-top: auto;
}

.footer-container p {
    margin: 0;
    opacity: 0.9;
    font-size: 0.8rem;
    line-height: 1.4;
}

/* ==================== Main Content ==================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem;
    min-height: calc(100vh - 200px);
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    gap: var(--spacing-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-dark);
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: white;
}

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

.btn-danger:hover:not(:disabled) {
    background: #c53030;
}

.btn-logout {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.3);
}

.btn-back {
    background: var(--gray-200);
    color: var(--gray-700);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
}

.btn-back:hover {
    background: var(--gray-300);
}

.btn-block {
    width: 100%;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
}

/* ==================== Form Elements ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

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

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--gray-800);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

/* Ensure consistent select option colors */
select option {
    color: var(--gray-800);
}

/* ==================== Login Page ==================== */
.login-page {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    padding: var(--spacing-md);
    overflow: hidden;
    z-index: 1000;
}

.login-container {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 360px;
}

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

.login-logo {
    color: var(--primary-dark);
    font-size: 1.75rem;
    margin-bottom: 0;
}

.login-tagline {
    color: var(--secondary);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.login-header h2 {
    color: var(--gray-600);
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 0;
}

.login-form {
    margin-bottom: 0;
}

/* Session Ended Message */
.session-ended-message {
    background: var(--info-light);
    color: var(--info);
    border: 1px solid var(--info);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.session-ended-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.login-footer {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.85rem;
    margin-top: var(--spacing-md);
}

/* ==================== Security Warning Dialog ==================== */
.security-warning-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(139, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: security-pulse 2s ease-in-out infinite;
}

@keyframes security-pulse {
    0%, 100% { background: rgba(139, 0, 0, 0.95); }
    50% { background: rgba(180, 0, 0, 0.95); }
}

.security-warning-dialog {
    background: #1a0000;
    border: 4px solid #ff0000;
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl) var(--spacing-2xl);
    text-align: center;
    max-width: 450px;
    width: 90%;
    box-shadow: 0 0 60px rgba(255, 0, 0, 0.5);
}

.security-warning-icon {
    font-size: 5rem;
    color: #ff0000;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 0 20px rgba(255, 0, 0, 0.8);
    animation: warning-blink 1s ease-in-out infinite;
}

@keyframes warning-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.security-warning-title {
    color: #ff0000;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.security-warning-code {
    color: #ffffff;
    font-size: 1.5rem;
    font-weight: 600;
    font-family: 'Courier New', monospace;
    background: rgba(255, 0, 0, 0.2);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.security-warning-countdown {
    color: #cccccc;
    font-size: 1rem;
}

/* ==================== Active Session Warning Dialog ==================== */
.active-session-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.active-session-dialog {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.active-session-icon {
    font-size: 3rem;
    color: var(--warning);
    margin-bottom: var(--spacing-sm);
}

.active-session-title {
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.active-session-message {
    color: var(--gray-600);
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-lg);
}

.active-session-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.active-session-actions .btn {
    min-width: 140px;
}

/* ==================== Role Selection ==================== */
.role-selection-container {
    max-width: 420px;
}

.role-selection-prompt {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-top: var(--spacing-xs);
    margin-bottom: 0;
}

.role-selection-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.role-option {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.role-option:hover {
    border-color: var(--primary);
    background: white;
    box-shadow: var(--shadow-md);
}

.role-option:active {
    background: var(--gray-100);
}

.role-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.role-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.role-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
}

.role-description {
    font-size: 0.8rem;
    color: var(--gray-500);
    line-height: 1.3;
}

/* ==================== Error & Success Messages ==================== */
.error-message,
.error-banner {
    background: var(--danger-light);
    color: var(--danger);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.error-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--danger);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: bold;
}

.success-banner {
    background: var(--success-light);
    color: var(--success);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.success-icon {
    font-weight: bold;
}

/* ==================== Loading Spinner ==================== */
.loading-spinner {
    text-align: center;
    padding: var(--spacing-2xl);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 1s linear infinite;
}

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

/* ==================== Page Headers ==================== */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    margin-bottom: var(--spacing-xs);
}

.welcome-message,
.breadcrumb,
.course-context {
    color: var(--gray-500);
}

/* ==================== Section Headers ==================== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-100);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border-bottom: 3px solid var(--primary);
}

.section-header h2 {
    margin: 0;
    font-size: 1.2rem;
}

.section-count {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.section-header-in-progress {
    border-bottom-color: var(--info);
}

.section-header-assigned {
    border-bottom-color: var(--accent);
}

.section-header-completed {
    border-bottom-color: var(--success);
}

.section-header-goals {
    border-bottom-color: var(--secondary);
}

.section-header-content {
    border-bottom-color: var(--primary);
}

.section-header-validation {
    border-bottom-color: var(--accent);
}

.section-content {
    background: white;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
}

/* ==================== Course Section ==================== */
.course-section {
    margin-bottom: var(--spacing-xl);
}

.no-courses-message,
.no-content {
    color: var(--gray-500);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-lg);
}

/* ==================== Course Cards ==================== */
.course-card,
.module-card,
.topic-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    margin-bottom: var(--spacing-md);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.course-card:hover,
.module-card:hover,
.topic-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.course-info,
.module-info,
.topic-info {
    flex: 1;
}

.course-name,
.module-name,
.topic-name {
    margin-bottom: var(--spacing-xs);
}

.course-meta,
.module-meta,
.topic-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--gray-500);
}

.course-progress,
.module-progress {
    margin-top: var(--spacing-sm);
}

.module-number,
.topic-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    flex-shrink: 0;
}

.module-completed .module-number,
.topic-completed .topic-number {
    background: var(--success);
}

.completed-check {
    color: var(--success);
    font-size: 1.5rem;
    font-weight: bold;
}

/* ==================== Progress Bar ==================== */
.progress-bar-container {
    width: 100%;
    height: 12px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary) 0%, var(--secondary-light) 100%);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    min-width: 40px;
}

.progress-bar-text {
    font-size: 0.7rem;
    font-weight: 600;
    color: white;
}

.course-progress-bar,
.module-progress-bar {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

.course-progress-bar h3,
.module-progress-bar h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

/* ==================== Overview Section (Student) ==================== */

.overview-section {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
}

.overview-section .section-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    gap: var(--spacing-sm);
}

.overview-section .section-header h2 {
    margin: 0;
    font-size: 1.1rem;
    flex: 1;
}

.overview-section .section-header h2.clickable {
    cursor: pointer;
}

.overview-section .section-header h2.clickable:hover {
    color: var(--primary);
}

.overview-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.overview-content p {
    margin: 0;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ==================== Status Badge ==================== */
.status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.status-assigned {
    background: var(--warning-light);
    color: var(--warning);
}

.status-in-progress {
    background: var(--info-light);
    color: var(--info);
}

.status-completed {
    background: var(--success-light);
    color: var(--success);
}

/* ==================== Section Tabs ==================== */
.section-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--gray-200);
    padding-bottom: var(--spacing-sm);
}

.tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    transition: all 0.2s ease;
}

.tab:hover {
    color: var(--primary);
    background: var(--gray-100);
}

.tab.active {
    color: var(--primary);
    background: white;
    box-shadow: var(--shadow-sm);
}

/* ==================== Topic Section ==================== */
.topic-section {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.topic-section .section-body {
    padding: var(--spacing-xl);
}

.goals-content h3 {
    color: var(--secondary-dark);
    margin-bottom: var(--spacing-md);
}

.goals-text {
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.evidence-section {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent);
}

.evidence-section h4 {
    color: var(--accent-dark);
    margin-bottom: var(--spacing-sm);
}

.lesson-content {
    line-height: 1.8;
}

.lesson-content h1,
.lesson-content h2,
.lesson-content h3 {
    color: var(--primary-dark);
    margin-top: var(--spacing-xl);
}

.lesson-content p {
    margin-bottom: var(--spacing-md);
}

.lesson-content ul,
.lesson-content ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-xl);
}

.lesson-content li {
    margin-bottom: var(--spacing-sm);
}

.lesson-content code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.lesson-content pre {
    background: var(--gray-800);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.lesson-content strong {
    color: var(--primary-dark);
}

/* ==================== Quiz Styles ==================== */
.quiz-start {
    text-align: center;
    padding: var(--spacing-xl);
}

.quiz-start p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-600);
}

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-progress {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: var(--spacing-lg);
}

.quiz-progress-bar {
    height: 6px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.quiz-progress-bar .progress-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.3s ease;
}

.quiz-progress-text {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: var(--spacing-lg);
}

.question-card {
    background: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.question-text {
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.option:hover {
    border-color: var(--primary-light);
    background: var(--gray-50);
}

.option.selected {
    border-color: var(--primary);
    background: rgba(44, 82, 130, 0.05);
}

.option input[type="radio"] {
    width: auto;
    margin: 0;
}

.option-text {
    flex: 1;
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.question-dots {
    display: flex;
    gap: var(--spacing-xs);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--gray-300);
    cursor: pointer;
    transition: all 0.2s ease;
}

.dot.answered {
    background: var(--primary);
}

.dot.current {
    transform: scale(1.3);
    box-shadow: 0 0 0 2px white, 0 0 0 4px var(--primary);
}

/* ==================== Quiz Results ==================== */
.quiz-results,
.test-results {
    text-align: center;
}

.results-header {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    max-width: 250px;
    margin-left: auto;
    margin-right: auto;
}

.results-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.results-header.passed,
.results-card.passed {
    background: linear-gradient(135deg, var(--success) 0%, #276749 100%);
    color: white;
}

.results-header.failed,
.results-card.failed {
    background: linear-gradient(135deg, var(--warning) 0%, #c05621 100%);
    color: white;
}

.results-header h3 {
    color: white;
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.results-card h2 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.results-header .score-display {
    font-size: 1.75rem;
    font-weight: 700;
}

.score-display,
.score-circle {
    font-size: 3rem;
    font-weight: 700;
}

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

.results-summary {
    margin-bottom: var(--spacing-xl);
}

.results-review {
    text-align: left;
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}

.results-review h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--gray-700);
}

.review-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
}

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

.review-question {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.question-number {
    color: var(--primary);
}

.review-answer {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.review-answer.correct {
    background: var(--success-light);
    color: var(--success);
}

.review-answer.incorrect {
    background: var(--danger-light);
    color: var(--danger);
}

.review-explanation {
    font-size: 0.9rem;
    color: var(--gray-600);
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.review-options {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
}

.review-option {
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--gray-700);
}

.review-option.correct-answer {
    background: var(--success-light);
    color: var(--success);
    font-weight: 500;
}

.review-option.wrong-selection {
    background: var(--danger-light);
    color: var(--danger);
    text-decoration: line-through;
}

.review-option.your-answer:not(.wrong-selection) {
    background: var(--success-light);
    color: var(--success);
}

.related-topic-badge {
    font-size: 0.8rem;
    color: var(--gray-500);
    font-weight: normal;
    margin-left: var(--spacing-xs);
}

.help-btn {
    margin-top: var(--spacing-sm);
}

.help-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--gray-600);
}

.help-loading .loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

.help-content {
    line-height: 1.6;
}

.help-content h4 {
    color: var(--primary-dark);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.help-content p {
    margin-bottom: var(--spacing-md);
}

.help-content ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.help-content li {
    margin-bottom: var(--spacing-xs);
}

.help-content strong {
    color: var(--primary-dark);
}

.help-question-summary {
    background: var(--gray-50);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.help-original-question {
    font-size: 1rem;
    color: var(--gray-800);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.help-options-list {
    margin-bottom: var(--spacing-md);
}

.help-option {
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--gray-700);
}

.help-option.correct-answer {
    background: var(--success-light);
    color: var(--success);
    font-weight: 500;
}

.help-option.wrong-selection {
    background: var(--danger-light);
    color: var(--danger);
}

.help-your-answer {
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--gray-200);
    font-size: 0.95rem;
}

.help-your-answer .incorrect-label {
    color: var(--danger);
    font-weight: 500;
    margin-left: var(--spacing-xs);
}

.help-your-answer .correct-was {
    display: block;
    color: var(--success);
    margin-top: var(--spacing-xs);
}

.help-divider {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: var(--spacing-md) 0;
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ==================== Recommendations Section ==================== */
.recommendations-section {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    text-align: left;
}

.recommendations-section .section-header {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark, #5a4fcf) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
}

.recommendations-section .section-header h3 {
    color: white;
    margin: 0;
    font-size: 1.1rem;
}

.recommendations-loading {
    padding: var(--spacing-xl);
    text-align: center;
}

.recommendations-loading p {
    margin-top: var(--spacing-md);
    color: var(--gray-600);
}

.recommendations-content {
    padding: var(--spacing-lg);
}

.recommendations-summary {
    background: var(--gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--secondary);
}

.recommendations-summary p {
    margin: 0;
    color: var(--gray-700);
}

.recommended-topics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.topic-recommendation {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: box-shadow 0.2s ease;
}

.topic-recommendation:hover {
    box-shadow: var(--shadow-md);
}

.topic-recommendation.priority-high {
    border-left: 4px solid var(--danger);
}

.topic-recommendation.priority-medium {
    border-left: 4px solid var(--warning);
}

.topic-recommendation.priority-low {
    border-left: 4px solid var(--info, #3182ce);
}

.topic-priority-badge {
    margin-bottom: var(--spacing-sm);
}

.topic-priority-badge span {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.priority-high .topic-priority-badge span {
    background: var(--danger-light);
    color: var(--danger);
}

.priority-medium .topic-priority-badge span {
    background: var(--warning-light);
    color: var(--warning);
}

.priority-low .topic-priority-badge span {
    background: var(--info-light, #bee3f8);
    color: var(--info, #3182ce);
}

.topic-recommendation h4.topic-name {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
}

.topic-recommendation .topic-reason {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.study-tips {
    background: var(--gray-50);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.study-tips strong {
    color: var(--gray-700);
    font-size: 0.85rem;
}

.study-tips ul {
    margin: var(--spacing-xs) 0 0 var(--spacing-lg);
    padding: 0;
}

.study-tips li {
    color: var(--gray-600);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
}

.encouragement-message {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--success-light);
    border-radius: var(--radius-md);
    text-align: center;
}

.encouragement-message p {
    margin: 0;
    color: var(--success);
    font-weight: 500;
}

.recommendations-fallback {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--gray-500);
}

/* ==================== Test Available Banner ==================== */
.test-available-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    color: var(--gray-800);
}

.test-available-banner h3 {
    color: var(--gray-800);
    margin-bottom: var(--spacing-xs);
}

.test-available-banner p {
    margin: 0;
}

.test-passed-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--success-light) 0%, var(--success) 100%);
    color: var(--gray-800);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

.test-passed-banner .banner-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.test-passed-banner .passed-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.1rem;
    color: var(--gray-800);
}

.test-passed-banner p {
    margin: 0;
    font-weight: 500;
    color: var(--gray-800);
}

.test-passed-banner .check-icon {
    color: var(--gray-800);
}

.check-icon {
    font-size: 1.5rem;
}

/* ==================== Test Intro ==================== */
.test-intro {
    display: flex;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.intro-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    max-width: 500px;
}

.intro-card h2 {
    color: var(--primary-dark);
}

.test-info {
    list-style: none;
    padding: 0;
    margin: var(--spacing-xl) 0;
}

.test-info li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-200);
}

/* ==================== Teacher & Admin Pages ==================== */
.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.student-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease;
}

.student-card:hover {
    box-shadow: var(--shadow-md);
}

.student-avatar,
.teacher-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.student-info {
    flex: 1;
}

.student-name {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-xs);
}

.student-meta,
.student-details {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.student-meta span {
    margin-right: var(--spacing-md);
}

/* ==================== Filter Bar ==================== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.filter-bar label {
    font-weight: 600;
    color: var(--gray-600);
}

.filter-bar select {
    width: auto;
    min-width: 150px;
}

/* ==================== Search Boxes ==================== */
.teacher-search-box,
.student-search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.teacher-search-box label,
.student-search-box label {
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.teacher-search-box .search-input,
.student-search-box .search-input,
.admin-search-box .search-input {
    flex: 1;
    max-width: 265px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

.teacher-search-box .search-input:focus,
.student-search-box .search-input:focus,
.admin-search-box .search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Checkbox aligned to far right in search boxes */
.checkbox-inline-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: normal !important;
    cursor: pointer;
    white-space: nowrap;
}

.checkbox-inline-right input[type="checkbox"] {
    margin: 0;
}

/* ==================== Assign Section ==================== */
.assign-section,
.create-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

.assign-form,
.create-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.assign-form select,
.create-form select {
    min-width: 200px;
}

.assign-form .searchable-dropdown,
.create-form .searchable-dropdown {
    min-width: 200px;
}

.form-row {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    align-items: flex-end;
}

.form-row .form-group {
    margin-bottom: 0;
    flex: 1;
    min-width: 180px;
}

.form-group-button {
    display: flex;
    align-items: flex-end;
}

.form-group-checkbox-right {
    display: flex;
    align-items: flex-end;
    margin-left: auto;
    padding-bottom: var(--spacing-xs);
    flex-shrink: 0;
}

.checkbox-with-tooltip {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    white-space: nowrap;
    font-size: 0.9rem;
    color: var(--gray-600);
}

.checkbox-with-tooltip input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    font-size: 14px;
    color: var(--gray-400);
    cursor: help;
    position: relative;
}

.tooltip-icon:hover {
    color: var(--primary);
}

.tooltip-text {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: 130%;
    right: 0;
    width: 280px;
    background-color: var(--gray-800);
    color: white;
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    line-height: 1.4;
    white-space: normal;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    right: 10px;
    border-width: 6px;
    border-style: solid;
    border-color: var(--gray-800) transparent transparent transparent;
}

.tooltip-icon:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

.no-courses-note {
    color: var(--gray-500);
    font-style: italic;
    margin-top: var(--spacing-md);
}

/* ==================== Tables ==================== */
.courses-table {
    overflow-x: auto;
}

.courses-table table {
    width: 100%;
    border-collapse: collapse;
}

.courses-table th,
.courses-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.courses-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
}

.table-progress {
    min-width: 120px;
}

/* ==================== Teacher Assignments ==================== */
.teacher-assignments {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.teacher-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.teacher-header h3 {
    margin: 0;
}

.student-count {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.students-list {
    padding: var(--spacing-sm);
}

.student-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--gray-100);
}

.student-row:last-child {
    border-bottom: none;
}

.semester-badge {
    background: var(--gray-200);
    color: var(--gray-600);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
}

.course-badge {
    background: #dbeafe;
    color: var(--primary-dark);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    margin-right: var(--spacing-sm);
}

.status-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.status-assigned {
    background: var(--gray-200);
    color: var(--gray-600);
}

.status-badge.status-in-progress {
    background: #fef3c7;
    color: #92400e;
}

.status-badge.status-completed {
    background: #d1fae5;
    color: #065f46;
}

.empty-teachers {
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
}

.empty-teachers h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-600);
}

.empty-teacher-list {
    color: var(--gray-500);
}

/* ==================== Stats Section ==================== */
.stats-section {
    margin-top: var(--spacing-xl);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

/* ==================== Assignments Section ==================== */
.assignments-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-xl);
}

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

.assignments-section .section-header h2 {
    margin: 0;
}

.section-count {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.student-avatar-small {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.assignment-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    min-width: 100px;
    text-align: center;
}

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

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }

    .header-container {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .course-card,
    .module-card,
    .topic-card {
        flex-direction: column;
        text-align: center;
    }

    .course-action,
    .module-action,
    .topic-action {
        width: 100%;
    }

    .course-action .btn,
    .module-action .btn,
    .topic-action .btn {
        width: 100%;
    }

    .section-tabs {
        flex-wrap: wrap;
    }

    .tab {
        flex: 1;
        min-width: 100px;
        text-align: center;
    }

    .assign-form,
    .create-form {
        flex-direction: column;
    }

    .form-row {
        flex-direction: column;
    }

    .form-row .form-group {
        min-width: 100%;
    }

    .quiz-navigation {
        flex-wrap: wrap;
    }

    .question-dots {
        order: 3;
        width: 100%;
        justify-content: center;
        margin-top: var(--spacing-md);
    }

    .test-available-banner {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .test-passed-banner {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .login-container {
        padding: var(--spacing-lg);
    }

    .students-grid {
        grid-template-columns: 1fr;
    }

    .student-card {
        flex-direction: column;
        text-align: center;
    }
}

/* ==================== Admin Tab Navigation ==================== */
.tab-navigation {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    background: white;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--primary);
    background: var(--gray-50);
}

.tab-btn.active {
    color: white;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: var(--shadow-sm);
}

.tab-btn.tab-btn-right {
    flex: none;
    margin-left: auto;
}

/* ==================== Students Management Section ==================== */
.students-management-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

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

.students-management-section .section-header h2 {
    margin: 0;
}

/* Section Header Buttons Container */
.section-header-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Coming Soon Message */
.coming-soon-message {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.coming-soon-message p {
    font-size: 1.5rem;
    color: var(--gray-500);
    font-style: italic;
}

/* Coming Soon Container (centered) */
.coming-soon-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    text-align: center;
}

.coming-soon-icon {
    font-size: 6rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.4;
}

.coming-soon-text {
    font-size: 1.5rem;
    color: var(--gray-400);
    font-style: italic;
    margin: 0;
}

/* ==================== Filter Controls ==================== */
.filter-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.filter-controls label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--gray-600);
}

.filter-controls input[type="checkbox"] {
    width: auto;
}

/* ==================== Students Table ==================== */
.students-table-container {
    overflow-x: auto;
}

.students-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.students-table th,
.students-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.students-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.students-table th.sortable-header {
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
}

.students-table th.sortable-header:hover {
    background: var(--gray-200);
}

.students-table th .sort-indicator {
    margin-left: var(--spacing-xs);
    color: var(--primary);
    font-size: 0.8em;
}

.students-table tbody tr {
    transition: background 0.2s ease;
}

.students-table tbody tr:hover {
    background: var(--gray-50);
}

.students-table .archived-row {
    background: var(--gray-100);
    opacity: 0.7;
}

.students-table .archived-row:hover {
    opacity: 1;
}

/* Teacher's own course assignments (shown in green) */
.students-table .teacher-self-assignment td {
    color: var(--success);
}

.students-table .teacher-self-assignment .status-badge {
    color: white;
}

/* Teacher's name in student dropdown (green - limited browser support) */
option.teacher-self-option {
    color: var(--success);
    font-weight: 600;
}

.actions-cell {
    white-space: nowrap;
}

/* ==================== Teachers Table (shares styles with students) ==================== */
.teachers-management-section {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

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

.teachers-management-section .section-header h2 {
    margin: 0;
}

.teachers-table-container {
    overflow-x: auto;
}

.teachers-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.teachers-table th,
.teachers-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.teachers-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.teachers-table th.sortable-header {
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
}

.teachers-table th.sortable-header:hover {
    background: var(--gray-200);
}

.teachers-table th .sort-indicator {
    margin-left: var(--spacing-xs);
    color: var(--primary);
    font-size: 0.8em;
}

.teachers-table tbody tr {
    transition: background 0.2s ease;
}

.teachers-table tbody tr:hover {
    background: var(--gray-50);
}

.teachers-table .archived-row {
    background: var(--gray-100);
    opacity: 0.7;
}

.teachers-table .archived-row:hover {
    opacity: 1;
}

/* ==================== Administrators Management Section ==================== */
.administrators-management-section {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

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

.administrators-management-section .section-header h2 {
    margin: 0;
}

.admin-search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.admin-search-box label {
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.administrators-table-container {
    overflow-x: auto;
}

.administrators-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.administrators-table th,
.administrators-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.administrators-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.administrators-table th.sortable-header {
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
}

.administrators-table th.sortable-header:hover {
    background: var(--gray-200);
}

.administrators-table th .sort-indicator {
    margin-left: var(--spacing-xs);
    color: var(--primary);
    font-size: 0.8em;
}

.administrators-table tbody tr {
    transition: background 0.2s ease;
}

.administrators-table tbody tr:hover {
    background: var(--gray-50);
}

.administrators-table .archived-row {
    background: var(--gray-100);
    opacity: 0.7;
}

.administrators-table .archived-row:hover {
    opacity: 1;
}

.current-user-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--info-light);
    color: var(--info);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

/* ==================== Course Management Section ==================== */
.courses-management-section {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

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

.courses-management-section .section-header h2 {
    margin: 0;
}

.course-search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.course-search-box label {
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.courses-list-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.course-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
    transition: background 0.2s ease, border-color 0.2s ease;
}

.course-item:hover {
    background: white;
    border-color: var(--gray-300);
}

.course-info {
    flex: 1;
}

.course-name {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
}

.course-description {
    margin: 0;
    font-size: 0.9rem;
    color: var(--gray-500);
}

.course-actions {
    margin-left: var(--spacing-lg);
}

/* ==================== Status Badges ==================== */
.status-active {
    background: var(--success-light);
    color: var(--success);
}

.status-archived {
    background: var(--gray-200);
    color: var(--gray-500);
}

/* ==================== Button Variants ==================== */
.btn-warning {
    background: var(--warning);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: #c05621;
}

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

.btn-success:hover:not(:disabled) {
    background: #276749;
}

/* ==================== Modal Overlay ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content.modal-large {
    max-width: 800px;
}

.modal-content.modal-medium {
    max-width: 600px;
}

.modal-content.modal-small {
    max-width: 400px;
}

.modal-header-warning {
    background-color: var(--warning-light);
    border-bottom: 2px solid var(--warning);
}

.modal-header-warning h2 {
    color: var(--warning-dark, #c05621);
}

.modal-header-danger {
    background-color: #fee2e2;
    border-bottom: 2px solid var(--danger);
}

.modal-header-danger h2 {
    color: var(--danger-dark, #b91c1c);
}

/* Modal Search Box */
.modal-search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.modal-search-box label {
    font-weight: 600;
    color: var(--gray-600);
    white-space: nowrap;
}

.modal-search-box .search-input {
    flex: 1;
    max-width: 265px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

/* Privilege User List */
.privilege-user-list {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
}

.privilege-user-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-100);
}

.privilege-user-row:last-child {
    border-bottom: none;
}

.privilege-user-row:hover {
    background: var(--gray-50);
}

.privilege-user-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.privilege-user-name {
    font-weight: 600;
    color: var(--gray-800);
}

.privilege-user-details {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--gray-500);
}

.role-badge {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.role-badge.role-admin {
    background: var(--primary-light);
    color: var(--primary);
}

.role-badge.role-teacher {
    background: var(--success-light);
    color: var(--success);
}

.privilege-user-action {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.current-user-label {
    color: var(--gray-400);
    font-size: 0.85rem;
    font-style: italic;
}

/* Modal Actions Centered */
.modal-actions-center {
    display: flex;
    justify-content: center;
}

/* Header Buttons Container */
.header-buttons {
    display: flex;
    gap: var(--spacing-md);
}

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

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body .form-group {
    margin-bottom: var(--spacing-md);
}

.modal-body .form-group:last-of-type {
    margin-bottom: var(--spacing-lg);
}

.modal-error {
    background: var(--danger-light);
    color: var(--danger);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}

.form-row-inline {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-row-inline .form-group {
    flex: 1;
    margin-bottom: 0;
}

.readonly-field {
    background-color: var(--gray-100);
    color: var(--gray-600);
    cursor: not-allowed;
}

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

/* ==================== Form Sections ==================== */
.form-section {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: var(--spacing-md);
}

.form-section h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
}

.form-group.flex-grow {
    flex: 2;
}

.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    min-height: 80px;
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.label-row label {
    margin-bottom: 0;
}

.label-row .char-count {
    margin-top: 0;
}

.char-count {
    display: block;
    text-align: right;
    font-size: 0.8rem;
    color: var(--gray-400);
    margin-top: var(--spacing-xs);
}

/* ==================== Close Button ==================== */
.btn-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: inherit;
    cursor: pointer;
    margin-left: auto;
    padding: 0;
    opacity: 0.7;
}

.btn-close:hover {
    opacity: 1;
}

/* ==================== Responsive Updates ==================== */
@media (max-width: 768px) {
    .tab-navigation {
        flex-direction: column;
    }

    .students-table {
        font-size: 0.85rem;
    }

    .students-table th,
    .students-table td {
        padding: var(--spacing-sm);
    }

    .modal-content {
        margin: var(--spacing-md);
        max-height: calc(100vh - 2rem);
    }
}

/* ==================== Course Editor Page ==================== */
.course-editor-page {
    max-width: 1400px;
    margin: 0 auto;
}

.course-editor-page .editor-header {
    margin-bottom: var(--spacing-md);
}

.course-editor-page .editor-header .btn-back {
    display: inline-flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.course-editor-page .editor-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-editor-page .editor-actions {
    display: flex;
    gap: var(--spacing-md);
}

.course-editor-page .editor-header h1 {
    margin: 0;
}

.course-editor-page .editor-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Saving Overlay */
.saving-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.saving-content {
    background: var(--success, #10b981);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.2rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
}

.saving-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Course Info Section (Full Width Top) */
.course-info-section {
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.course-info-section .section-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-100);
    border-bottom: 3px solid var(--primary);
    gap: var(--spacing-sm);
}

.course-info-section .section-header h2 {
    margin: 0;
    font-size: 1.1rem;
    flex: 1;
}

.course-info-section .section-header h2.clickable {
    cursor: pointer;
}

.course-info-section .section-header h2.clickable:hover {
    color: var(--primary);
}

.section-toggle {
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--gray-500);
    user-select: none;
}

.section-toggle:hover {
    color: var(--primary);
}

.course-info-form {
    padding: var(--spacing-lg);
}

.course-info-form .form-row {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.course-info-form .form-row:last-child {
    margin-bottom: 0;
}

.course-info-form .form-group {
    flex: 1;
    margin-bottom: 0;
    min-width: 150px;
}

.course-info-form .form-group-large {
    flex: 2;
}

.course-info-form .form-group-full {
    flex: 1;
    min-width: 100%;
}

.course-info-form .form-group-small {
    flex: 0 0 120px;
    min-width: 100px;
}

.course-info-form .form-group-checkbox {
    flex: 0 0 auto;
    display: flex;
    align-items: flex-end;
    padding-bottom: var(--spacing-sm);
    margin-left: auto;
    min-width: auto;
}

.course-info-form .form-group-checkbox label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    white-space: nowrap;
}

.course-info-form .form-group-checkbox input[type="checkbox"] {
    width: auto;
}

/* Split Panel Section */
.split-panel-section {
    display: flex;
    gap: var(--spacing-lg);
    min-height: 500px;
}

/* Tree Panel (Left) */
.tree-panel {
    flex: 0 0 320px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.tree-panel .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-100);
    border-bottom: 3px solid var(--secondary);
}

.tree-panel .panel-header h3 {
    margin: 0;
    font-size: 1rem;
}

.tree-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.tree-empty {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--gray-500);
}

.tree-empty p {
    margin: var(--spacing-sm) 0;
}

/* Module Tree */
.module-tree {
    list-style: none;
    padding: 0;
    margin: 0;
}

.module-node {
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.module-node.selected > .module-header {
    background: var(--primary-light);
    color: white;
}

.module-node.selected > .module-header .topic-count {
    color: rgba(255, 255, 255, 0.8);
}

.module-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-50);
    cursor: pointer;
    transition: background 0.2s ease;
}

.module-header:hover {
    background: var(--gray-100);
}

.module-node.selected > .module-header:hover {
    background: var(--primary);
}

.expand-icon {
    flex-shrink: 0;
    width: 16px;
    text-align: center;
    color: var(--gray-500);
    cursor: pointer;
}

.module-node.selected > .module-header .expand-icon {
    color: rgba(255, 255, 255, 0.8);
}

.module-name {
    flex: 1;
    font-weight: 600;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topic-count {
    font-size: 0.85rem;
    color: var(--gray-400);
}

/* Topic List */
.topic-list {
    list-style: none;
    padding: 0;
    margin: 0;
    background: white;
    border-top: 1px solid var(--gray-200);
}

.topic-node {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: var(--spacing-xl);
    cursor: pointer;
    transition: background 0.2s ease;
    border-bottom: 1px solid var(--gray-100);
}

.topic-node:last-child {
    border-bottom: none;
}

.topic-node:hover {
    background: var(--gray-50);
}

.topic-node.selected {
    background: var(--secondary-light);
    color: var(--gray-800);
}

.topic-icon {
    font-size: 0.5rem;
    color: var(--secondary);
}

.topic-node.selected .topic-icon {
    color: var(--gray-800);
}

.topic-name {
    flex: 1;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.no-topics {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: var(--spacing-xl);
    color: var(--gray-400);
    font-size: 0.85rem;
    font-style: italic;
}

.btn-add-topic {
    margin: var(--spacing-sm);
    margin-left: var(--spacing-xl);
}

.btn-tiny {
    padding: 2px var(--spacing-sm);
    font-size: 0.75rem;
}

/* Edit Panel (Right) */
.edit-panel {
    flex: 1;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.no-selection {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-content {
    text-align: center;
    color: var(--gray-400);
}

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

/* Edit Forms */
.module-edit-form,
.topic-edit-form {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.module-edit-form .panel-header,
.topic-edit-form .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.module-edit-form .panel-header h3,
.topic-edit-form .panel-header h3 {
    margin: 0;
    font-size: 1rem;
}

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

.edit-form-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.edit-form-content .form-group {
    margin-bottom: var(--spacing-sm);
}

.edit-form-content .form-row {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-end;
}

.edit-form-content .form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.edit-form-content .form-group-id {
    flex: 0 0 200px;
    max-width: 200px;
    min-width: 200px;
    min-width: auto;
}

.edit-form-content .form-group-sort {
    flex: 0 0 auto;
    min-width: auto;
    max-width: 95px;
    white-space: nowrap;
}

.form-group-duration {
    flex: 0 0 220px;
    min-width: 220px;
}

/* Duration input with formatted overlay */
.duration-input-wrapper {
    position: relative;
}

.duration-input-wrapper input {
    width: 100%;
}

.duration-display {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-sm);
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: text;
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: nowrap;
    z-index: 1;
}

.edit-form-content .form-group-small {
    flex: 0 0 120px;
    min-width: 100px;
    max-width: 120px;
}

.edit-form-content .form-group-large {
    flex: 2;
}

.edit-form-content .form-group-checkbox {
    display: flex;
    align-items: center;
    padding-bottom: var(--spacing-sm);
}

.edit-form-content .form-group-checkbox label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.edit-form-content .form-group-checkbox input[type="checkbox"] {
    width: auto;
}

.edit-form-content input:disabled {
    background: var(--gray-100);
    color: var(--gray-500);
    cursor: not-allowed;
}

/* Responsive for Course Editor */
@media (max-width: 1024px) {
    .split-panel-section {
        flex-direction: column;
    }

    .tree-panel {
        flex: none;
        width: 100%;
        max-height: 300px;
    }

    .edit-panel {
        min-height: 400px;
    }
}

@media (max-width: 768px) {
    .course-editor-page .editor-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .course-info-form .form-row {
        flex-direction: column;
    }

    .course-info-form .form-group,
    .course-info-form .form-group-large,
    .course-info-form .form-group-small {
        flex: none;
        width: 100%;
        min-width: 100%;
    }

    .edit-form-content .form-row {
        flex-direction: column;
    }

    .edit-form-content .form-row .form-group,
    .edit-form-content .form-group-small {
        flex: none;
        width: 100%;
    }
}

/* ==================== Searchable Dropdown ==================== */
.searchable-dropdown {
    position: relative;
    width: 100%;
}

.searchable-dropdown-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 30px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--gray-800);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    background-color: white;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.searchable-dropdown-input::placeholder {
    color: var(--gray-500);
}

.searchable-dropdown-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.searchable-dropdown-arrow {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
    cursor: pointer;
    font-size: 0.8rem;
    pointer-events: auto;
}

.searchable-dropdown.open .searchable-dropdown-arrow {
    transform: translateY(-50%) rotate(180deg);
}

.searchable-dropdown-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 250px;
    overflow-y: auto;
    background: white;
    border: 1px solid var(--gray-300);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

.searchable-dropdown-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: background-color 0.15s;
    font-size: 1rem;
    color: var(--gray-800);
}

.searchable-dropdown-item:hover,
.searchable-dropdown-item.highlighted {
    background-color: var(--gray-100);
}

.searchable-dropdown-item.searchable-dropdown-empty {
    color: var(--gray-500);
    font-style: italic;
}

.searchable-dropdown-no-results {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--gray-500);
    font-style: italic;
    text-align: center;
}

/* Form group adjustments for searchable dropdown */
.form-group .searchable-dropdown {
    margin-top: 0;
}

/* ==================== SuperUser Dashboard ==================== */

.superuser-page .page-header {
    margin-bottom: var(--spacing-xl);
}

.superuser-page .page-header h1 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
}

.superuser-page .welcome-message {
    color: var(--gray-600);
    font-size: 1rem;
}

.superuser-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Maintenance Section */
.maintenance-section,
.system-info-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.maintenance-actions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.maintenance-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    transition: box-shadow 0.2s;
}

.maintenance-card:hover {
    box-shadow: var(--shadow-md);
}

.maintenance-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.maintenance-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-dark);
}

.maintenance-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

/* System Info Grid */
.system-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.info-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xs);
}

.info-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-dark);
}