/* ================= STYLE SYSTEM VARIABLES ================= */
:root {
    /* Fonts */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;

    /* Theme-independent Colors */
    --color-success: #10b981;
    --color-success-soft: rgba(16, 185, 129, 0.1);
    --color-danger: #ef4444;
    --color-danger-soft: rgba(239, 68, 68, 0.1);
    --color-warning: #f59e0b;
    --color-warning-soft: rgba(245, 158, 11, 0.15);
    --color-info: #0284c7;
    
    /* Light Mode Variables */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-sidebar: #ffffff;
    --bg-accent: #eff6ff;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --primary-color: #2563eb;
    --primary-color-hover: #1d4ed8;
    --primary-color-soft: rgba(37, 99, 235, 0.08);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    
    /* Editor highlight colors (RGB value for selection matching) */
    --highlight-yellow: #fef08a;
    --highlight-blue: #bfdbfe;
    --highlight-green: #bbf7d0;

    --sidebar-width: 260px;
    --transition-speed: 0.3s;
}

/* Dark Mode Variables */
.dark-theme {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-sidebar: #0f172a;
    --bg-accent: #1e293b;
    --border-color: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #6b7280;
    --primary-color: #3b82f6;
    --primary-color-hover: #60a5fa;
    --primary-color-soft: rgba(59, 130, 246, 0.15);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* ================= BASIC STYLING ================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
}

/* Scrollbar styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Utility classes */
.hidden {
    display: none !important;
}
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-success { color: var(--color-success); }
.text-primary { color: var(--primary-color); }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}
.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
}
.btn-primary:hover {
    background-color: var(--primary-color-hover);
    transform: translateY(-1px);
}
.btn-secondary {
    background-color: var(--bg-accent);
    color: var(--text-secondary);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}
.btn-danger {
    background-color: var(--color-danger);
    color: #ffffff;
}
.btn-danger:hover {
    background-color: #dc2626;
}
.btn-link {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.9rem;
    padding: 5px;
    text-decoration: none;
}
.btn-link:hover {
    color: var(--primary-color-hover);
    text-decoration: underline;
}
.btn-block {
    width: 100%;
}
.btn-lg {
    padding: 12px 28px;
    font-size: 1.05rem;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    background-color: var(--bg-accent);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.badge-warning {
    background-color: var(--color-warning-soft);
    color: var(--color-warning);
    border-color: rgba(245, 158, 11, 0.3);
}
.badge-success {
    background-color: var(--color-success-soft);
    color: var(--color-success);
    border-color: rgba(16, 185, 129, 0.3);
}

/* ================= TOAST NOTIFICATION SYSTEM ================= */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.toast {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-left: 3px solid var(--primary-color);
    box-shadow: 0 4px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    padding: 8px 14px;
    border-radius: 4px;
    min-width: 240px;
    max-width: 320px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.toast.toast-success {
    border-left-color: var(--color-success);
}
.toast.toast-warning {
    border-left-color: var(--color-warning);
}
.toast.toast-info {
    border-left-color: var(--color-info);
}
.toast-content {
    flex-grow: 1;
}
.toast-title {
    font-weight: 600;
    font-size: 0.82rem;
    margin-bottom: 1px;
}
.toast-msg {
    font-size: 0.74rem;
    color: var(--text-secondary);
    word-break: break-all;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ================= AUTH OVERLAY & SCREENS ================= */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.08) 0%, rgba(15, 23, 42, 0.01) 90%), var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}
.auth-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    border-radius: 16px;
    width: 100%;
    max-width: 450px;
    padding: 40px;
    transition: transform 0.3s ease;
}
.auth-brand {
    text-align: center;
    margin-bottom: 30px;
}
.brand-logo-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 12px;
    filter: drop-shadow(0 0 10px rgba(37, 99, 235, 0.2));
}
.auth-brand h2 {
    font-size: 1.8rem;
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}
.auth-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.auth-step {
    display: none;
}
.auth-step.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.input-group {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.input-group input[type="text"],
.input-group input[type="email"],
.input-group textarea,
.input-group select {
    font-family: var(--font-primary);
    font-size: 0.95rem;
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-soft);
}
.input-help {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.pending-icon-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}
.pending-icon {
    font-size: 3rem;
    color: var(--color-warning);
}
.auth-step h3 {
    text-align: center;
    margin-bottom: 10px;
}
.auth-step p {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 20px;
}
.approval-card {
    background-color: var(--bg-accent);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.security-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}
.code-header {
    text-align: center;
    margin-bottom: 24px;
}
.verification-code-container {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 24px;
}
.code-input {
    width: 60px;
    height: 60px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    outline: none;
    transition: all 0.2s;
}
.code-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-soft);
}
.code-input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.resend-wrapper {
    text-align: center;
    margin-top: 16px;
    margin-bottom: 16px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================= APP LAYOUT ================= */
.app-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: sticky;
    top: 0;
    z-index: 100;
}
.sidebar-brand {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}
.logo-wrapper {
    background-color: var(--primary-color-soft);
    width: 42px;
    height: 42px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.logo-icon {
    font-size: 1.4rem;
    color: var(--primary-color);
}
.brand-text h1 {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.2;
}
.user-role-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 4px;
    background-color: var(--color-warning-soft);
    color: var(--color-warning);
    text-transform: uppercase;
}

.sidebar-nav {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex-grow: 1;
    overflow-y: auto;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}
.nav-item:hover {
    background-color: var(--bg-accent);
    color: var(--text-primary);
}
.nav-item.active {
    background-color: var(--primary-color-soft);
    color: var(--primary-color);
    font-weight: 600;
}
.nav-item i {
    font-size: 1.1rem;
    width: 20px;
}

.sidebar-footer {
    padding: 20px 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.user-profile-summary {
    display: flex;
    align-items: center;
    gap: 12px;
}
.user-profile-summary .avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: var(--bg-accent);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}
.user-info h4 {
    font-size: 0.85rem;
    font-weight: 600;
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.btn-logout-link {
    background: none;
    border: none;
    font-size: 0.78rem;
    color: var(--color-danger);
    cursor: pointer;
    font-weight: 500;
    padding: 0;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.btn-logout-link:hover {
    text-decoration: underline;
}

.theme-toggle-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background-color: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.theme-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Switch Toggle slider */
.switch {
    position: relative;
    display: inline-block;
    width: 38px;
    height: 20px;
}
.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--text-muted);
    transition: .4s;
}
.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    transform: translateX(18px);
}
.slider.round {
    border-radius: 34px;
}
.slider.round:before {
    border-radius: 50%;
}

/* Main Content Wrapper */
.main-content {
    padding: 40px;
    overflow-y: auto;
    height: 100vh;
}
.view-section {
    animation: fadeIn 0.3s ease;
}
.page-header {
    margin-bottom: 32px;
}
.page-header h2 {
    font-size: 1.8rem;
    margin-bottom: 4px;
}
.page-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Cards layout */
.grid-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}
.card-header {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h3 {
    font-size: 1.15rem;
    font-weight: 600;
}

/* ================= DASHBOARD SPECIFICS ================= */
.dashboard-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}
.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
}
.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}
.correct-bg { background-color: var(--color-success-soft); color: var(--color-success); }
.incorrect-bg { background-color: var(--color-danger-soft); color: var(--color-danger); }
.marked-bg { background-color: var(--color-warning-soft); color: var(--color-warning); }
.unused-bg { background-color: var(--primary-color-soft); color: var(--primary-color); }

.stat-details h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}
.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
}

.dashboard-main-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 24px;
}
.chart-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.chart-container {
    position: relative;
    width: 100%;
    max-width: 250px;
    height: 250px;
    margin: 20px 0;
}
.chart-legend-summary {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 16px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}
.legend-col {
    text-align: center;
}
.legend-col .lbl {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.legend-col .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}
.legend-col .val {
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 2px;
}

.quick-stats-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}
.quick-stat-item {
    display: flex;
    justify-content: space-between;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}
.quick-stat-item .label {
    color: var(--text-secondary);
}
.quick-actions-panel h4 {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* ================= GENERATE TEST VIEW ================= */
.generate-form-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}
.form-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
}
.form-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}
.section-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 20px;
}
.form-row-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.mode-toggle-selector {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.mode-option {
    border: 1.5px solid var(--border-color);
    padding: 16px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: all 0.2s;
}
.mode-option:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-primary);
}
.mode-option.active {
    border-color: var(--primary-color);
    background-color: var(--primary-color-soft);
}
.mode-option i {
    font-size: 1.6rem;
    color: var(--primary-color);
}
.mode-option strong {
    display: block;
    font-size: 0.95rem;
}
.mode-option span {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.source-cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}
.source-card {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}
.source-card:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-primary);
}
.source-card.active {
    border-color: var(--primary-color);
    border-style: solid;
    background-color: var(--primary-color-soft);
}
.source-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}
.source-card h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.topics-selection-wrapper {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
}
.topics-selection-wrapper h4 {
    font-size: 0.9rem;
    margin-bottom: 12px;
}
.topics-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 180px;
    overflow-y: auto;
}
.topic-checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}
.topic-checkbox-item input {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.generate-actions-bar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
}
.selected-qs-indicator {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ================= MY TESTS & TABLES ================= */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}
.data-table th,
.data-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.92rem;
}
.data-table th {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
}
.data-table tbody tr {
    transition: background-color 0.15s;
}
.data-table tbody tr:hover {
    background-color: var(--bg-primary);
}

.empty-state {
    text-align: center;
    padding: 60px 40px;
}
.empty-icon {
    font-size: 3.5rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}
.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 6px;
}
.empty-state p {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

/* ================= NOTEBOOK VIEW ================= */
.notebook-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    height: calc(100vh - 180px);
    background-color: var(--bg-secondary);
    overflow: hidden;
}
.notebook-sidebar {
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 16px;
    gap: 16px;
    background-color: var(--bg-primary);
}
.notebook-search-box {
    position: relative;
}
.notebook-search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.88rem;
}
.notebook-search-box input {
    width: 100%;
    padding: 10px 12px 10px 36px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
}
.notes-list {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.note-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}
.note-item:hover {
    border-color: var(--primary-color);
}
.note-item.active {
    border-color: var(--primary-color);
    background-color: var(--primary-color-soft);
}
.note-item h4 {
    font-size: 0.9rem;
    margin-bottom: 4px;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}
.note-item p {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
}
.note-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.note-date {
    font-size: 0.7rem;
    color: var(--text-muted);
}
.note-type-badge {
    font-size: 0.65rem;
    background-color: var(--bg-primary);
    padding: 1px 4px;
    border-radius: 3px;
    border: 1px solid var(--border-color);
}

.notebook-editor {
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}
.editor-inner {
    display: none;
    flex-direction: column;
    height: 100%;
}
.editor-inner.active {
    display: flex;
}
.editor-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.editor-header input {
    background: none;
    border: none;
    outline: none;
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    width: 70%;
}
.note-save-badge {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}
.editor-toolbar {
    padding: 8px 24px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.tool-btn {
    background: none;
    border: 1px solid transparent;
    border-radius: 4px;
    color: var(--text-secondary);
    padding: 6px 10px;
    cursor: pointer;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.tool-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}
.toolbar-divider {
    width: 1px;
    height: 20px;
    background-color: var(--border-color);
    margin: 0 4px;
}

.highlight-tool-wrapper {
    position: relative;
}
.highlight-palette {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    border-radius: 6px;
    padding: 6px;
    z-index: 10;
    gap: 6px;
}
.highlight-palette.show {
    display: flex;
}
.palette-color {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid rgba(0,0,0,0.1);
}
.palette-color.color-yellow { background-color: var(--highlight-yellow); }
.palette-color.color-blue { background-color: var(--highlight-blue); }
.palette-color.color-green { background-color: var(--highlight-green); }
.palette-color.color-clear { 
    background-color: #ffffff; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    font-size: 0.65rem;
    color: #ef4444;
}

.editor-body {
    flex-grow: 1;
    padding: 24px;
    overflow-y: auto;
    outline: none;
    font-size: 1rem;
    color: var(--text-primary);
}
.editor-body mark.highlight-yellow { background-color: var(--highlight-yellow); color: #000000; }
.editor-body mark.highlight-blue { background-color: var(--highlight-blue); color: #000000; }
.editor-body mark.highlight-green { background-color: var(--highlight-green); color: #000000; }

.editor-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
}
.editor-empty i {
    font-size: 4rem;
    margin-bottom: 16px;
}

/* ================= ADMIN PANEL ================= */
.admin-tabs-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}
.admin-tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 8px 16px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.admin-tab-btn:hover {
    color: var(--text-primary);
}
.admin-tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}
.admin-tab-content {
    display: none;
}
.admin-tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.admin-questions-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.admin-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 8px;
}
.form-actions {
    display: flex;
    gap: 12px;
}

.admin-questions-list-wrapper {
    max-height: 520px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
}
.admin-q-list {
    display: flex;
    flex-direction: column;
}
.admin-q-item {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    gap: 12px;
}
.admin-q-item:last-child {
    border-bottom: none;
}
.admin-q-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.admin-q-meta {
    display: flex;
    gap: 8px;
    margin-top: 6px;
}
.admin-q-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    justify-content: center;
}

/* ================= ACTIVE TEST FULLSCREEN OVERLAY ================= */
.active-test-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    z-index: 2000;
    display: flex;
    flex-direction: column;
}
.test-header {
    background-color: var(--bg-sidebar);
    border-bottom: 2px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}
.test-title-section {
    display: flex;
    align-items: center;
    gap: 12px;
}
.test-title-section h2 {
    font-size: 1.1rem;
    line-height: 1.2;
}
.test-mode-badge {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    background-color: var(--primary-color-soft);
    color: var(--primary-color);
    text-transform: uppercase;
}

.test-header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}
.test-tool-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    cursor: pointer;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.test-tool-btn:hover,
.test-tool-btn.active {
    background-color: var(--bg-accent);
    color: var(--primary-color);
    border-color: var(--primary-color);
}
.test-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}
.test-timer-container {
    background-color: var(--bg-accent);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: monospace;
    font-weight: 700;
    color: var(--text-primary);
}

.test-interface-body {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    height: calc(100vh - 70px);
    overflow: hidden;
    transition: grid-template-columns 0.2s ease-in-out;
}
.test-interface-body.no-notes-sidebar {
    grid-template-columns: 240px 1fr;
}
.test-interface-body.hide-left-sidebar {
    grid-template-columns: 0px 1fr 280px;
}
.test-interface-body.hide-left-sidebar.no-notes-sidebar {
    grid-template-columns: 0px 1fr;
}
.test-interface-body.hide-left-sidebar .test-nav-sidebar {
    width: 0;
    padding: 0;
    border: none;
    overflow: hidden;
}

/* Sidebar navigation of questions map */
.test-nav-sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.test-nav-sidebar h3 {
    font-size: 0.95rem;
    color: var(--text-secondary);
}
.questions-navigation-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    overflow-y: auto;
    flex-grow: 1;
}
.test-nav-btn {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    height: 34px;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.15s;
}
.test-nav-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.test-nav-btn.current {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}
.test-nav-btn.answered {
    background-color: var(--primary-color-soft);
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.test-nav-btn.flagged::after {
    content: "\f024"; /* flag icon from fontawesome */
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 0.55rem;
    color: var(--color-warning);
    position: absolute;
    top: 1px;
    right: 2px;
}
.test-nav-legend {
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.legend-item {
    font-size: 0.78rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.legend-box {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid var(--border-color);
    display: inline-block;
}
.legend-box.current { background-color: var(--primary-color); border-color: var(--primary-color); }
.legend-box.answered { background-color: var(--primary-color-soft); border-color: var(--primary-color); }

/* Center question display */
.test-question-area {
    padding: 32px 40px;
    overflow-y: auto;
    background-color: var(--bg-primary);
}
.question-header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.question-number-indicator {
    font-size: 1rem;
    color: var(--text-secondary);
}
.btn-flag-question {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}
.btn-flag-question.flagged {
    color: var(--color-warning);
}

.question-prompt-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    border-radius: 12px;
    padding: 24px;
    font-size: 1.05rem;
    margin-bottom: 24px;
    user-select: text; /* Allow highlighting */
}

/* Custom Highlight styles on test text */
.question-prompt-card ::selection {
    background-color: var(--highlight-yellow);
    color: #000000;
}
/* User-selected highlighted classes via JS injection */
.question-prompt-card span.text-highlight {
    background-color: var(--highlight-yellow);
    color: #000000;
}

.question-choices-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}
.choice-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px 20px;
    text-align: left;
    font-family: var(--font-primary);
    font-size: 0.98rem;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.15s;
}
.choice-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--bg-accent);
}
.choice-btn.selected {
    border-color: var(--primary-color);
    background-color: var(--primary-color-soft);
}
.choice-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1.5px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.88rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}
.choice-btn.selected .choice-letter {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
}
.choice-text {
    flex-grow: 1;
}

/* Rationale box */
.choice-btn.correct-choice {
    border-color: var(--color-success);
    background-color: var(--color-success-soft);
}
.choice-btn.correct-choice .choice-letter {
    background-color: var(--color-success);
    color: #ffffff;
    border-color: var(--color-success);
}
.choice-btn.incorrect-choice {
    border-color: var(--color-danger);
    background-color: var(--color-danger-soft);
}
.choice-btn.incorrect-choice .choice-letter {
    background-color: var(--color-danger);
    color: #ffffff;
    border-color: var(--color-danger);
}

.question-explanation-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--color-success);
    border-radius: 12px;
    padding: 24px;
    animation: slideUp 0.3s ease;
}
.explanation-header {
    color: var(--color-success);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.explanation-body {
    font-size: 0.95rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Right notes/notepad sidebar during test */
.test-notes-sidebar {
    background-color: var(--bg-sidebar);
    border-left: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.test-notes-sidebar h3 {
    font-size: 0.95rem;
    color: var(--text-secondary);
}
.notes-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
}
.question-notepad-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}
.question-notepad-wrapper textarea {
    width: 100%;
    flex-grow: 1;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    outline: none;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    resize: none;
}
.question-notepad-wrapper textarea:focus {
    border-color: var(--primary-color);
}
.notepad-status {
    font-size: 0.72rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
    justify-content: flex-end;
}
.notepad-status i {
    color: var(--color-success);
}

/* Question Navigation Buttons bar */
.question-navigation-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 24px 0;
    gap: 16px;
}
.question-navigation-buttons .btn {
    flex: 1;
    max-width: 180px;
}

/* Admin Questions Search Bar Styles */
.card-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-input-wrapper {
    position: relative;
    max-width: 320px;
    width: 100%;
}

.search-input-wrapper input {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all 0.25s ease;
}

.search-input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.search-input-wrapper .search-icon {
    position: absolute;
    left: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

/* Outline button for dangerous actions */
.btn-danger.btn-outline {
    background: transparent;
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
}
.btn-danger.btn-outline:hover {
    background-color: var(--color-danger);
    color: #ffffff;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.3);
}

/* Sidebar Collapse Toggle Buttons */
.btn-sidebar-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    margin-left: 8px;
}
.btn-sidebar-toggle:hover {
    background-color: var(--border-color);
    color: var(--primary-color);
}

.btn-sidebar-expand-floating {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 999;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}
.btn-sidebar-expand-floating:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: scale(1.05);
}

/* Collapsed layout overrides */
.app-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
    transition: grid-template-columns 0.3s ease;
}
.app-layout.sidebar-collapsed {
    grid-template-columns: 0px 1fr;
}
.app-layout.sidebar-collapsed .sidebar {
    transform: translateX(-260px);
    width: 0;
    padding: 0;
    overflow: hidden;
    border-right: none;
}
.app-layout.sidebar-collapsed .btn-sidebar-expand-floating {
    display: flex !important;
}

.sidebar {
    transition: all 0.3s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

/* ================= LANDING PAGE STYLES ================= */
.landing-page-container {
    min-height: 100vh;
    background: radial-gradient(circle at 10% 20%, rgb(4, 21, 45) 0%, rgb(13, 27, 49) 90.1%);
    color: #ffffff;
    padding: 80px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Outfit', 'Inter', sans-serif;
    overflow-x: hidden;
    position: relative;
    z-index: 100;
}

.dark-theme .landing-page-container {
    background: radial-gradient(circle at 10% 20%, rgb(4, 21, 45) 0%, rgb(13, 27, 49) 90.1%);
}

.light-theme .landing-page-container {
    background: radial-gradient(circle at 10% 20%, rgb(240, 244, 248) 0%, rgb(220, 228, 238) 90.1%);
    color: #1e293b;
}

.landing-hero {
    text-align: center;
    max-width: 800px;
    margin-bottom: 60px;
}

.landing-logo {
    font-size: 5rem;
    color: #60a5fa;
    margin-bottom: 24px;
    filter: drop-shadow(0 0 15px rgba(96, 165, 250, 0.4));
    animation: pulseLogo 3s infinite ease-in-out;
}

.light-theme .landing-logo {
    color: #2563eb;
    filter: drop-shadow(0 0 15px rgba(37, 99, 235, 0.2));
}

.landing-hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #ffffff 0%, #93c5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.light-theme .landing-hero h1 {
    background: linear-gradient(135deg, #1e293b 0%, #2563eb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.landing-tagline {
    font-size: 1.6rem;
    color: #60a5fa;
    font-weight: 500;
    margin-bottom: 24px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.light-theme .landing-tagline {
    color: #2563eb;
}

.landing-description {
    font-size: 1.15rem;
    color: #cbd5e1;
    line-height: 1.6;
    margin-bottom: 36px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.light-theme .landing-description {
    color: #475569;
}

.landing-cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.landing-cta-buttons .btn {
    padding: 14px 32px;
    font-size: 1.1rem;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.landing-cta-buttons .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.35);
}

.landing-cta-buttons .btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.05);
}

.landing-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    width: 100%;
    max-width: 1200px;
    margin-top: 20px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
}

.light-theme .feature-card {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(96, 165, 250, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.light-theme .feature-card:hover {
    background: #ffffff;
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: var(--shadow-lg);
}

.feature-card i {
    font-size: 2.5rem;
    color: #60a5fa;
    margin-bottom: 20px;
}

.light-theme .feature-card i {
    color: #2563eb;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.95rem;
    color: #94a3b8;
    line-height: 1.5;
}

.light-theme .feature-card p {
    color: #64748b;
}

@keyframes pulseLogo {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

/* ================= FLASHCARDS INTERACTIVE PLAY ================= */
.flashcards-play-layout {
    perspective: 1000px;
    margin-top: 30px;
}

.flashcard-container {
    width: 100%;
    height: 320px;
    cursor: pointer;
    perspective: 1000px;
    position: relative;
}

.flashcard-card {
    width: 100%;
    height: 100%;
    position: absolute;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.flashcard-container.flipped .flashcard-card {
    transform: rotateY(180deg);
}

.flashcard-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 20px;
    padding: 40px 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    text-align: center;
    border: 1px solid var(--border-color);
    overflow-y: auto;
}

.flashcard-front {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.flashcard-back {
    background-color: var(--primary-color);
    color: #ffffff;
    transform: rotateY(180deg);
    border-color: var(--primary-color);
}

.card-category {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    background: rgba(96, 165, 250, 0.15);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 50px;
}

.flashcard-back .card-category {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.card-text {
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.6;
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
}

.card-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.flashcard-back .card-hint {
    color: rgba(255, 255, 255, 0.7);
}

/* ================= GROUP SPECIFIC PRIMARY COLOR MODIFIERS ================= */
body.group-infection {
    --primary-color: #2563eb;
    --primary-color-hover: #1d4ed8;
    --primary-color-soft: rgba(37, 99, 235, 0.08);
}
body.group-infection.dark-theme {
    --primary-color: #3b82f6;
    --primary-color-hover: #60a5fa;
    --primary-color-soft: rgba(59, 130, 246, 0.15);
}

body.group-dermatology {
    --primary-color: #ec4899; /* Pink */
    --primary-color-hover: #db2777;
    --primary-color-soft: rgba(236, 72, 153, 0.08);
}
body.group-dermatology.dark-theme {
    --primary-color: #f472b6; /* Lighter Pink */
    --primary-color-hover: #f472b6;
    --primary-color-soft: rgba(244, 114, 182, 0.15);
}

/* ================= COURSE SELECTOR PAGE ================= */
.course-selector-page {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 1) 100%), #0f172a;
    color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 40px 20px;
    overflow-y: auto;
}

.selector-header {
    text-align: center;
    max-width: 800px;
    margin-bottom: 30px;
    animation: fadeInDown 0.6s ease;
}

.selector-header h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #3b82f6 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

.selector-about-card {
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 24px 30px;
    margin-bottom: 40px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
    text-align: center;
    max-width: 800px;
    animation: fadeInUp 0.7s ease;
}

.selector-about-card h3 {
    color: #f1f5f9;
    font-size: 1.3rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.selector-about-card p {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.6;
}

.selector-cards-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    width: 100%;
    max-width: 900px;
    animation: fadeInUp 0.8s ease;
}

@media (max-width: 768px) {
    .selector-cards-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .selector-header h1 {
        font-size: 2.2rem;
    }
}

.course-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 40px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.course-card:hover {
    transform: translateY(-8px);
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.course-card.infection-card:hover {
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.15);
    border-color: rgba(37, 99, 235, 0.4);
}

.course-card.dermatology-card:hover {
    box-shadow: 0 20px 40px rgba(236, 72, 153, 0.15);
    border-color: rgba(236, 72, 153, 0.4);
}

.course-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    margin-bottom: 24px;
    transition: transform 0.4s ease;
}

.course-card:hover .course-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
}

.infection-card .course-icon-wrapper {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.2) 0%, rgba(59, 130, 246, 0.2) 100%);
    color: #3b82f6;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.dermatology-card .course-icon-wrapper {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.2) 0%, rgba(244, 114, 182, 0.2) 100%);
    color: #f472b6;
    border: 1px solid rgba(244, 114, 182, 0.3);
}

.course-card h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 12px;
}

.course-card p {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 24px;
    flex-grow: 1;
}

.course-card .btn {
    width: 100%;
    justify-content: center;
    padding: 12px 24px;
    font-weight: 600;
    border-radius: 12px;
}

/* Switch Course Button Specific Styling */
.btn-switch-course {
    background: rgba(239, 68, 68, 0.1) !important;
    color: #ef4444 !important;
    border: 1px solid rgba(239, 68, 68, 0.2) !important;
    margin-top: 10px;
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: var(--font-heading);
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-switch-course:hover {
    background: #ef4444 !important;
    color: #ffffff !important;
    border-color: #ef4444 !important;
}

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

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

/* ================= REPORT TASKS (MOCK EXAMS) STYLES ================= */
.admin-rt-questions-scroller {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    max-height: 280px;
    overflow-y: auto;
    padding: 12px;
    margin-top: 8px;
}

.rt-topic-group {
    margin-bottom: 15px;
}

.rt-topic-group-header {
    background: var(--bg-primary);
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 3px solid var(--primary-color);
    margin-bottom: 8px;
}

.rt-topic-select-all-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s;
}

.rt-topic-select-all-btn:hover {
    background: var(--primary-color-soft);
}

.rt-question-checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: 4px;
}

.rt-question-checkbox-item:hover {
    background: var(--border-color);
}

.rt-question-checkbox-item input[type="checkbox"] {
    margin-top: 3px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.rt-question-checkbox-item span {
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--text-secondary);
}

/* Student Report Task Cards */
.report-tasks-student-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

.report-task-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

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

.report-task-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
}

.rt-card-meta {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    margin-bottom: 16px;
}

.rt-meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.rt-status-indicator {
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
}

.rt-status-unsolved {
    color: var(--color-warning);
}

.rt-status-inprogress {
    color: var(--primary-color);
}

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

.rt-score-display {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 8px 0;
}

/* Mobile Responsiveness for Course Quiz Sidebar */
@media (max-width: 768px) {
    #active-quiz-overlay .test-workspace {
        flex-direction: column !important;
        height: auto !important;
        overflow-y: auto !important;
    }
    #active-quiz-overlay .test-main-section {
        flex-grow: 1 !important;
        padding: 20px !important;
        height: auto !important;
    }
    #active-quiz-sidebar {
        width: 100% !important;
        border-left: none !important;
        border-top: 1px solid var(--border-color) !important;
        padding: 15px !important;
    }
    #active-quiz-questions-grid {
        grid-template-columns: repeat(8, 1fr) !important;
    }

    /* General App Layout Mobile Overrides */
    .app-layout {
        grid-template-columns: 1fr !important;
    }
    .sidebar {
        position: fixed !important;
        left: 0 !important;
        top: 0 !important;
        bottom: 0 !important;
        width: 260px !important;
        z-index: 1000 !important;
        transform: translateX(0);
    }
    .app-layout.sidebar-collapsed .sidebar {
        transform: translateX(-260px) !important;
        width: 0 !important;
    }
    .btn-sidebar-expand-floating {
        position: fixed !important;
        left: 15px !important;
        bottom: 15px !important;
        z-index: 999 !important;
    }
    .dashboard-main-grid {
        grid-template-columns: 1fr !important;
        gap: 20px !important;
    }
    .dashboard-stats-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
    }
    .stat-card {
        padding: 12px !important;
        gap: 10px !important;
    }
    .stat-icon {
        width: 38px !important;
        height: 38px !important;
        font-size: 1.2rem !important;
    }
    .stat-value {
        font-size: 1.3rem !important;
    }
    .page-header h2 {
        font-size: 1.5rem !important;
    }
    .content-area {
        padding: 15px !important;
        overflow-x: hidden !important;
    }

    /* Practice Test Workspace Overrides */
    .test-interface-body {
        grid-template-columns: 1fr !important;
        height: auto !important;
        overflow-y: auto !important;
    }
    .test-nav-sidebar {
        border-right: none !important;
        border-bottom: 1px solid var(--border-color) !important;
        width: 100% !important;
        padding: 15px !important;
    }
    .test-question-area {
        width: 100% !important;
        padding: 15px !important;
        height: auto !important;
        overflow-y: visible !important;
    }
    .test-notes-sidebar {
        width: 100% !important;
        border-left: none !important;
        border-top: 1px solid var(--border-color) !important;
        padding: 15px !important;
        height: auto !important;
    }
    .test-header {
        height: auto !important;
        flex-direction: column !important;
        gap: 12px !important;
        padding: 12px 16px !important;
        align-items: flex-start !important;
    }
    .test-header-controls {
        width: 100% !important;
        justify-content: flex-start !important;
        flex-wrap: wrap !important;
        gap: 8px !important;
    }
    /* Compress utility buttons to icons on mobile to save space */
    #btn-toggle-test-questions-sidebar,
    #btn-test-highlighter {
        font-size: 0 !important;
        padding: 8px 12px !important;
    }
    #btn-toggle-test-questions-sidebar i,
    #btn-test-highlighter i {
        font-size: 1.1rem !important;
    }
}