@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- CUSTOM VARIABLES --- */
:root {
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Theme colors */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-sidebar: #0f172a;
    --color-sidebar-text: #94a3b8;
    --color-sidebar-active: #6366f1;
    --color-sidebar-hover: #1e293b;
    
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: #e0e7ff;
    
    --color-secondary: #0ea5e9;
    --color-secondary-hover: #0284c7;
    --color-secondary-light: #e0f2fe;

    --color-success: #10b981;
    --color-success-hover: #059669;
    --color-success-light: #d1fae5;

    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-danger-light: #fee2e2;

    --color-warning: #f59e0b;
    --color-warning-hover: #d97706;
    --color-warning-light: #fef3c7;

    --color-text-main: #1e293b;
    --color-text-muted: #64748b;
    --color-text-white: #ffffff;
    
    --color-border: #e2e8f0;
    --color-border-focus: #cbd5e1;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* --- LAYOUT STRUCTURE --- */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar styling */
.sidebar {
    width: 260px;
    background-color: var(--color-sidebar);
    color: var(--color-text-white);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: var(--transition-normal);
    z-index: 100;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid #1e293b;
}

.school-logo {
    width: 40px;
    height: 40px;
    background-color: var(--color-sidebar-active);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: var(--color-text-white);
    font-family: var(--font-heading);
}

.school-name {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 16px;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-nav {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
}

.nav-section-title {
    font-family: var(--font-heading);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #475569;
    margin: 16px 0 8px 8px;
    font-weight: 700;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--color-sidebar-text);
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition-fast);
    margin-bottom: 4px;
    cursor: pointer;
}

.nav-link:hover {
    color: var(--color-text-white);
    background-color: var(--color-sidebar-hover);
}

.nav-link.active {
    color: var(--color-text-white);
    background-color: var(--color-sidebar-active);
}

.nav-link i {
    font-size: 18px;
    width: 20px;
    display: flex;
    justify-content: center;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid #1e293b;
}

.user-profile-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background-color: #334155;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 11px;
    color: var(--color-sidebar-text);
}

.logout-btn {
    color: var(--color-sidebar-text);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition-fast);
}

.logout-btn:hover {
    color: var(--color-danger);
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: 70px;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.topbar-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.academic-badge {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.main-content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

/* --- CARDS & STATS --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 20px;
    position: relative;
    overflow: hidden;
}

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

.stat-card.secondary::after { background-color: var(--color-secondary); }
.stat-card.success::after { background-color: var(--color-success); }
.stat-card.warning::after { background-color: var(--color-warning); }

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-card.primary .stat-icon { background-color: var(--color-primary-light); color: var(--color-primary); }
.stat-card.secondary .stat-icon { background-color: var(--color-secondary-light); color: var(--color-secondary); }
.stat-card.success .stat-icon { background-color: var(--color-success-light); color: var(--color-success); }
.stat-card.warning .stat-icon { background-color: var(--color-warning-light); color: var(--color-warning); }

.stat-details {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* Base Card */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    margin-bottom: 24px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
}

.card-body {
    padding: 24px;
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

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

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

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

.btn-warning { background-color: var(--color-warning); color: var(--color-text-white); }
.btn-warning:hover { background-color: var(--color-warning-hover); }
.btn-warning.btn-outline {
    background-color: transparent;
    border: 1px solid var(--color-warning);
    color: var(--color-warning);
}
.btn-warning.btn-outline:hover {
    background-color: var(--color-warning-light);
    color: var(--color-warning-hover);
}

.btn-outline { background-color: transparent; border: 1px solid var(--color-border); color: var(--color-text-main); }
.btn-outline:hover { background-color: var(--color-bg); border-color: var(--color-border-focus); }

.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 6px; }

/* --- FORM CONTROLS --- */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text-main);
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    transition: var(--transition-fast);
    background-color: var(--color-surface);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
}

/* --- TABLES --- */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

table.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
    background-color: var(--color-surface);
}

table.custom-table th {
    background-color: var(--color-bg);
    color: var(--color-text-muted);
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}

table.custom-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

table.custom-table tr:last-child td {
    border-bottom: none;
}

table.custom-table tbody tr:hover {
    background-color: #fafafa;
}

/* Badge helpers */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-success { background-color: var(--color-success-light); color: var(--color-success); }
.badge-danger { background-color: var(--color-danger-light); color: var(--color-danger); }
.badge-warning { background-color: var(--color-warning-light); color: var(--color-warning); }
.badge-info { background-color: var(--color-secondary-light); color: var(--color-secondary); }

/* --- MODALS --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    width: 500px;
    max-width: 90%;
    box-shadow: var(--shadow-xl);
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
    border: 1px solid var(--color-border);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
}

.modal-close, .btn-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text-muted);
}

.modal-close:hover, .btn-close:hover {
    color: var(--color-text-main);
}

.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* --- TABS --- */
.tab-container {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 24px;
}

.tab-btn {
    padding: 12px 20px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text-muted);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    color: var(--color-text-main);
}

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* --- LOGIN SCREEN --- */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 10% 20%, rgb(99, 102, 241) 0%, rgb(30, 41, 59) 90.2%);
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    width: 440px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
}

.login-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
}

.login-logo-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-md);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 800;
    font-family: var(--font-heading);
}

.login-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 24px;
    text-align: center;
    margin-bottom: 8px;
    color: var(--color-sidebar);
}

.login-subtitle {
    font-size: 14px;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: 32px;
}

.login-toggle {
    display: flex;
    background-color: rgba(226, 232, 240, 0.6);
    border-radius: var(--radius-sm);
    padding: 4px;
    margin-bottom: 24px;
}

.login-toggle-btn {
    flex: 1;
    padding: 8px;
    font-size: 13px;
    font-weight: 600;
    background: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: var(--transition-fast);
}

.login-toggle-btn.active {
    background-color: var(--color-surface);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* --- STUDENT CBT INTERFACE --- */
.cbt-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f8fafc;
}

.cbt-header {
    height: 72px;
    background: rgba(15, 23, 42, 0.95);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.cbt-header-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 20px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.cbt-timer {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: rgba(30, 41, 59, 0.8);
    padding: 8px 18px;
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 800;
    color: var(--color-warning);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all var(--transition-fast);
}

.cbt-timer.time-warning {
    color: var(--color-danger);
    background-color: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.3);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.2);
    animation: pulse 1s infinite alternate;
}

@keyframes pulse {
    from { opacity: 1; transform: scale(1); }
    to { opacity: 0.8; transform: scale(0.97); }
}

.cbt-content {
    flex: 1;
    display: flex;
    max-width: 1200px;
    width: 100%;
    margin: 32px auto;
    padding: 0 24px;
    gap: 32px;
}

.cbt-main-panel {
    flex: 1;
    min-width: 0;
}

.cbt-card {
    background-color: var(--color-surface);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    min-height: 520px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.cbt-question-header {
    padding: 24px 32px;
    background-color: #fafbfc;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cbt-question-number {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 700;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 6px 14px;
    border-radius: var(--radius-md);
    letter-spacing: 0.02em;
}

.cbt-question-difficulty {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.cbt-question-body {
    padding: 40px;
    font-size: 16.5px;
    flex: 1;
    color: var(--color-text-main);
    transition: opacity 0.15s ease-out, transform 0.15s ease-out;
    opacity: 1;
    transform: translateY(0);
}

.cbt-question-body.switching {
    opacity: 0;
    transform: translateY(6px);
}

.cbt-question-text {
    margin-bottom: 36px;
    line-height: 1.7;
    font-weight: 600;
    font-size: 18px;
}

.cbt-option {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 14px;
    cursor: pointer;
    background-color: var(--color-surface);
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    transition: all var(--transition-fast) cubic-bezier(0.4, 0, 0.2, 1);
}

.cbt-option:hover {
    background-color: #fafbfc;
    border-color: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.cbt-option.selected {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary);
}

.cbt-option-letter {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--color-border-focus);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    flex-shrink: 0;
    color: var(--color-text-muted);
    background-color: #f8fafc;
    transition: all var(--transition-fast);
}

.cbt-option.selected .cbt-option-letter {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.cbt-option-text {
    font-weight: 500;
    color: var(--color-text-main);
}

.cbt-essay-input {
    width: 100%;
    min-height: 220px;
    padding: 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    resize: vertical;
    transition: all var(--transition-fast);
}

.cbt-essay-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.12);
}

.cbt-footer {
    padding: 24px 40px;
    background-color: #fafbfc;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cbt-sidebar {
    width: 300px;
    flex-shrink: 0;
}

.cbt-sidebar-card {
    background-color: var(--color-surface);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    padding: 24px;
    position: sticky;
    top: 104px;
}

.cbt-sidebar-title {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 14px;
    margin-bottom: 20px;
    color: var(--color-text-main);
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cbt-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 24px;
}

.cbt-grid-item {
    aspect-ratio: 1;
    background-color: #f8fafc;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast) cubic-bezier(0.4, 0, 0.2, 1);
}

.cbt-grid-item:hover {
    background-color: #f1f5f9;
    border-color: var(--color-border-focus);
    transform: translateY(-1px);
}

.cbt-grid-item.active {
    border: 2.2px solid var(--color-primary);
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.25);
    transform: scale(1.05);
}

.cbt-grid-item.answered {
    background: linear-gradient(135deg, var(--color-primary), #4f46e5);
    color: #ffffff;
    border-color: var(--color-primary);
}

.cbt-grid-item.flagged {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #ffffff;
    border-color: #f59e0b;
}

.cbt-legend {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 12px;
    font-weight: 600;
    border-top: 1px solid var(--color-border);
    padding-top: 20px;
    color: var(--color-text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-color {
    width: 18px;
    height: 18px;
    border-radius: 6px;
    border: 1px solid rgba(0,0,0,0.05);
}

/* Circular Score Indicator styles */
.score-circle-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 28px 0;
}

.score-circle {
    position: relative;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: rotateRing 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: var(--shadow-sm);
}

.score-circle-inner {
    width: 116px;
    height: 116px;
    background-color: var(--color-surface);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.05);
}

.score-circle-value {
    font-size: 38px;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1;
}

.score-circle-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--color-text-muted);
    letter-spacing: 0.08em;
    margin-top: 6px;
}

@keyframes rotateRing {
    from {
        transform: rotate(-120deg) scale(0.85);
        opacity: 0;
    }
    to {
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
}

/* Student Exam Cards Dashboard styling */
.student-exam-card {
    background-color: var(--color-surface);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 18px;
    transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.student-exam-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 6px;
    background-color: var(--color-primary);
    transition: width 0.2s ease;
}

.student-exam-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.student-exam-card:hover::before {
    width: 8px;
}

.student-exam-card.finished::before {
    background-color: var(--color-success);
}
.student-exam-card.ongoing::before {
    background-color: var(--color-warning);
}

.student-exam-meta {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 10px;
    flex-wrap: wrap;
}

.student-exam-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Alert Notification Panel */
.alert-popup {
    position: fixed;
    top: 24px;
    right: 24px;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-primary);
    border-radius: 4px;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 2000;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
}

.alert-popup.show {
    transform: translateX(0);
}

.alert-popup.success { border-left-color: var(--color-success); }
.alert-popup.danger { border-left-color: var(--color-danger); }
.alert-popup.warning { border-left-color: var(--color-warning); }

/* --- RESPONSIVE ADJUSTMENTS --- */
@media (max-width: 992px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
    }
    .sidebar-nav {
        display: flex;
        overflow-x: auto;
        padding: 8px;
    }
    .nav-section-title {
        display: none;
    }
    .nav-link {
        margin-bottom: 0;
        white-space: nowrap;
    }
    .cbt-content {
        flex-direction: column;
    }
    .cbt-sidebar {
        width: 100%;
    }
}

/* --- SIMPLIFIED QUESTION BUILDER STYLES --- */
.btn-type-card {
    flex: 1;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: var(--transition-fast);
    background-color: var(--color-surface);
}
.btn-type-card:hover {
    border-color: var(--color-border-focus);
    background-color: #fafafa;
}
.btn-type-card.active {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}
.option-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    background: #f8fafc;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition-fast);
}
.option-row:focus-within {
    border-color: var(--color-primary);
    background: #ffffff;
}
.option-letter-label {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-text-muted);
    font-size: 16px;
    width: 24px;
}
.option-row-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 6px 0;
    font-size: 14px;
    color: var(--color-text-main);
}
.option-row-input:focus {
    outline: none;
}
.option-row-radio-btn {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-success);
}
.option-row.correct-option {
    border-color: var(--color-success);
    background-color: var(--color-success-light);
}
.option-row.correct-option .option-letter-label {
    color: var(--color-success);
}
.advanced-toggle-btn {
    background: none;
    border: none;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    transition: var(--transition-fast);
}
.advanced-toggle-btn:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}
.advanced-panel {
    display: none;
    border-top: 1px dashed var(--color-border);
    padding-top: 16px;
    margin-top: 16px;
}

/* Custom premium scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(100, 116, 139, 0.2);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(100, 116, 139, 0.4);
}