/* =====================================================
   ระบบแบบทดสอบออนไลน์ - Modern School Quiz System
   Responsive CSS Framework
   ===================================================== */

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

/* ===== CSS Variables ===== */
:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --primary-50: #EEF2FF;
    --primary-100: #E0E7FF;
    --secondary: #0EA5E9;
    --secondary-light: #38BDF8;
    --accent: #F59E0B;
    --accent-light: #FCD34D;
    --success: #10B981;
    --success-light: #D1FAE5;
    --danger: #EF4444;
    --danger-light: #FEE2E2;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --info: #3B82F6;
    --info-light: #DBEAFE;

    --bg-body: #F1F5F9;
    --bg-card: #FFFFFF;
    --bg-sidebar: #1E293B;
    --bg-sidebar-hover: #334155;
    --bg-sidebar-active: #4F46E5;

    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --text-white: #FFFFFF;
    --text-sidebar: #CBD5E1;

    --border: #E2E8F0;
    --border-light: #F1F5F9;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Noto Sans Thai', 'Inter', sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; }

/* ===== Login Page ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: float 20s linear infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-50px, -50px) rotate(360deg); }
}

.login-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: var(--shadow-xl), 0 0 60px rgba(79,70,229,0.15);
    text-align: center;
    animation: slideUp 0.6s ease-out;
}

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

.login-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: white;
    box-shadow: 0 8px 24px rgba(79,70,229,0.35);
}

.login-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-card .subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.input-icon-wrap {
    position: relative;
}

.input-icon-wrap .icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
    pointer-events: none;
}

.input-icon-wrap input {
    width: 100%;
    padding: 12px 14px 12px 44px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-card);
    color: var(--text-primary);
}

.input-icon-wrap input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-50);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(79,70,229,0.35);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79,70,229,0.45);
    color: white;
}

.btn-success {
    background: var(--success);
    color: white;
    box-shadow: 0 4px 12px rgba(16,185,129,0.35);
}
.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
    color: white;
}

.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover {
    background: #DC2626;
    transform: translateY(-1px);
    color: white;
}

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

.btn-secondary {
    background: var(--bg-body);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--border);
    color: var(--text-primary);
}

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

.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-lg { padding: 16px 32px; font-size: 1.05rem; }
.btn-full { width: 100%; }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: var(--radius); }

/* ===== Layout ===== */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-header {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.sidebar-logo {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    flex-shrink: 0;
}

.sidebar-brand h2 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-white);
    line-height: 1.3;
}

.sidebar-brand small {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0 12px;
    margin-bottom: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius);
    color: var(--text-sidebar);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    margin-bottom: 2px;
    cursor: pointer;
}

.nav-item:hover {
    background: var(--bg-sidebar-hover);
    color: white;
}

.nav-item.active {
    background: var(--bg-sidebar-active);
    color: white;
    box-shadow: 0 4px 12px rgba(79,70,229,0.4);
}

.nav-item .material-symbols-rounded {
    font-size: 22px;
    flex-shrink: 0;
}

.nav-item .badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 0.7rem;
    padding: 2px 7px;
    border-radius: var(--radius-full);
    font-weight: 700;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.user-info {
    flex: 1;
    overflow: hidden;
}

.user-info .name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-info .role {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: var(--transition);
}

/* ===== Top Header ===== */
.top-header {
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 500;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-body);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 22px;
    color: var(--text-primary);
    align-items: center;
    justify-content: center;
}

.page-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.page-title small {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
    display: block;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-btn {
    width: 42px;
    height: 42px;
    border: none;
    background: var(--bg-body);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 20px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: var(--transition);
}
.header-btn:hover {
    background: var(--primary-50);
    color: var(--primary);
}

.header-btn .dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 10px;
    height: 10px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid white;
}

/* ===== Content Area ===== */
.content-area {
    padding: 28px;
}

/* ===== Stats Cards ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}
.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    flex-shrink: 0;
}

.stat-icon.blue { background: var(--info-light); color: var(--info); }
.stat-icon.green { background: var(--success-light); color: var(--success); }
.stat-icon.orange { background: var(--warning-light); color: var(--warning); }
.stat-icon.red { background: var(--danger-light); color: var(--danger); }
.stat-icon.purple { background: var(--primary-50); color: var(--primary); }

.stat-info h3 {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-info .trend {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-top: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}
.stat-info .trend.up { background: var(--success-light); color: var(--success); }
.stat-info .trend.down { background: var(--danger-light); color: var(--danger); }

/* ===== Card Component ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header h2 .material-symbols-rounded {
    color: var(--primary);
}

.card-body {
    padding: 24px;
}

.card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-body);
}

/* ===== Table ===== */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

.data-table th {
    background: var(--bg-body);
    padding: 12px 16px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
    color: var(--text-primary);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: var(--transition);
}
.data-table tbody tr:hover {
    background: var(--primary-50);
}

.data-table .user-cell {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== Badge / Tag ===== */
.badge-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
}

.badge-published { background: var(--success-light); color: var(--success); }
.badge-draft { background: var(--warning-light); color: #92400E; }
.badge-closed { background: var(--danger-light); color: var(--danger); }
.badge-quiz { background: var(--info-light); color: var(--info); }
.badge-survey { background: #F3E8FF; color: #7C3AED; }
.badge-passed { background: var(--success-light); color: var(--success); }
.badge-failed { background: var(--danger-light); color: var(--danger); }
.badge-inprogress { background: var(--warning-light); color: #92400E; }
.badge-admin { background: var(--danger-light); color: var(--danger); }
.badge-teacher { background: var(--info-light); color: var(--info); }
.badge-student { background: var(--success-light); color: var(--success); }

/* ===== Form Elements ===== */
.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-card);
    color: var(--text-primary);
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-50);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 0;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
    cursor: pointer;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== Quiz Builder ===== */
.question-builder {
    counter-reset: question;
}

.question-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
    margin-bottom: 20px;
    transition: var(--transition);
    overflow: hidden;
}
.question-card:hover,
.question-card.active {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.question-card-header {
    background: var(--bg-body);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.question-number {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--primary);
    font-size: 0.9rem;
}

.question-number::before {
    counter-increment: question;
    content: "ข้อ " counter(question);
}

.question-card-body {
    padding: 20px;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    transition: var(--transition);
    background: var(--bg-card);
}
.option-item:hover { border-color: var(--primary-light); }
.option-item.correct {
    border-color: var(--success);
    background: var(--success-light);
}

.option-letter {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--bg-body);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.option-item.correct .option-letter {
    background: var(--success);
    color: white;
}

/* ===== Quiz Taking ===== */
.quiz-interface {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-progress {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
}

.progress-bar-wrap {
    height: 10px;
    background: var(--bg-body);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: 12px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}
.quiz-timer.warning { color: var(--danger); animation: pulse 1s infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.quiz-question-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
    animation: fadeIn 0.3s ease;
}

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

.quiz-question-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-card);
}
.quiz-option:hover {
    border-color: var(--primary-light);
    background: var(--primary-50);
}
.quiz-option.selected {
    border-color: var(--primary);
    background: var(--primary-50);
}
.quiz-option.correct {
    border-color: var(--success);
    background: var(--success-light);
}
.quiz-option.incorrect {
    border-color: var(--danger);
    background: var(--danger-light);
}

.quiz-option input {
    display: none;
}

.option-radio {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.quiz-option.selected .option-radio {
    border-color: var(--primary);
    background: var(--primary);
}

.quiz-option.selected .option-radio::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: 700;
}

/* ===== Anti-Cheat Warning ===== */
.cheat-warning {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}
.cheat-warning.show { display: flex; }

.cheat-warning-content {
    background: white;
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
    max-width: 450px;
    width: 90%;
    box-shadow: var(--shadow-xl);
}

.cheat-warning-content .icon {
    font-size: 64px;
    color: var(--danger);
    margin-bottom: 16px;
}

.cheat-warning-content h2 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--danger);
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 72px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--border);
    padding: 0 4px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-item {
    padding: 12px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
    white-space: nowrap;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    font-family: inherit;
}
.tab-item:hover { color: var(--primary); }
.tab-item.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* ===== Modal / Dialog ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.modal-overlay.show { display: flex; }

.modal-box {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: 24px 28px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-body);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 18px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-body { padding: 24px 28px; }
.modal-footer {
    padding: 16px 28px 24px;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* ===== Alert / Toast ===== */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    font-weight: 500;
    animation: slideUp 0.3s ease;
}

.alert-success { background: var(--success-light); color: #065F46; border-left: 4px solid var(--success); }
.alert-danger { background: var(--danger-light); color: #991B1B; border-left: 4px solid var(--danger); }
.alert-warning { background: var(--warning-light); color: #92400E; border-left: 4px solid var(--warning); }
.alert-info { background: var(--info-light); color: #1E40AF; border-left: 4px solid var(--info); }

/* ===== Result Score Display ===== */
.score-display {
    text-align: center;
    padding: 40px;
}

.score-circle {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    margin: 0 auto 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}
.score-circle.passed {
    background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
    border: 6px solid var(--success);
}
.score-circle.failed {
    background: linear-gradient(135deg, #FEE2E2, #FECACA);
    border: 6px solid var(--danger);
}
.score-circle .score-number {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1;
}
.score-circle.passed .score-number { color: var(--success); }
.score-circle.failed .score-number { color: var(--danger); }
.score-circle .score-label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 4px;
}

/* ===== Print Styles ===== */
@media print {
    .sidebar, .top-header, .no-print { display: none !important; }
    .main-content { margin-left: 0 !important; }
    .content-area { padding: 0 !important; }
    .card { box-shadow: none !important; border: 1px solid #ddd !important; }
    body { background: white !important; }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .menu-toggle { display: flex; }
    .sidebar-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 999; }
    .sidebar-overlay.show { display: block; }
}

@media (max-width: 768px) {
    /* Layout */
    .content-area { padding: 12px; }
    .top-header { padding: 0 12px; }
    .page-title { font-size: .95rem; }
    .page-title small { font-size: .72rem; }

    /* Cards */
    .card { border-radius: var(--radius); }
    .card-header { padding: 14px 16px; flex-direction: column; align-items: flex-start; gap: 10px; }
    .card-header h2 { font-size: .95rem; }
    .card-body { padding: 14px 16px; }

    /* Stats Grid - 2 columns */
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; gap: 8px !important; }
    .stat-card { padding: 14px 12px; }
    .stat-icon { width: 40px; height: 40px; font-size: 20px; }
    .stat-info h3 { font-size: 1.2rem; }
    .stat-info p { font-size: .72rem; }

    /* Forms - stack all rows */
    .form-row { grid-template-columns: 1fr !important; gap: 10px !important; }
    .form-group { margin-bottom: 10px; }
    .form-label { font-size: .82rem; }
    .form-control { padding: 10px 12px; font-size: .88rem; }
    select.form-control { font-size: .85rem; }

    /* Tables - horizontal scroll + compact */
    .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 -16px; padding: 0 16px; }
    .data-table { min-width: 600px; font-size: .8rem; }
    .data-table th, .data-table td { padding: 8px 10px; white-space: nowrap; }

    /* Buttons */
    .btn { padding: 9px 14px; font-size: .82rem; }
    .btn-lg { padding: 12px 20px; font-size: .9rem; }
    .btn-sm { padding: 6px 10px; font-size: .75rem; }

    /* Login page */
    .login-card { padding: 28px 20px; }
    .login-card h1 { font-size: 1.3rem; }

    /* Quiz Question Cards */
    .quiz-question-card { padding: 16px; margin-bottom: 12px; }
    .quiz-question-text { font-size: .9rem; }
    .quiz-option { padding: 12px 14px; }
    .option-letter { width: 30px; height: 30px; font-size: .75rem; }

    /* Question Builder (teacher) */
    .question-card { margin-bottom: 12px; }
    .question-card-header { flex-direction: column; gap: 10px; align-items: flex-start !important; padding: 12px 14px; }
    .question-card-body { padding: 12px 14px; }

    /* Force inline grids to stack */
    [style*="grid-template-columns: 1fr 1fr"],
    [style*="grid-template-columns:1fr 1fr"],
    [style*="grid-template-columns: repeat(auto-fill"],
    [style*="grid-template-columns:repeat(auto-fill"] {
        grid-template-columns: 1fr !important;
    }

    /* Alerts */
    .alert { padding: 10px 14px; font-size: .85rem; }

    /* Navigation buttons */
    .quiz-actions { flex-wrap: wrap; }
    .quiz-actions .btn { flex: 1; min-width: 0; text-align: center; justify-content: center; }

    /* Modal */
    .modal-box { margin: 10px; max-height: 90vh; overflow-y: auto; }

    /* Quill Editor */
    .ql-toolbar.ql-snow { padding: 4px !important; }
    .ql-toolbar .ql-formats { margin-right: 4px !important; }
    .ql-editor { min-height: 80px !important; font-size: 13px !important; }

    /* Flatpickr */
    .flatpickr-calendar { font-size: .85rem; }

    /* View Results */
    .progress-bar-wrap { height: 6px; }
    .question-nav { gap: 4px; }
    .q-nav-btn { width: 34px; height: 34px; font-size: .75rem; }

    /* Feature/Quiz grids on homepage */
    .quiz-grid, .feats, .qgrid { grid-template-columns: 1fr !important; }
}

@media (max-width: 480px) {
    .content-area { padding: 8px; }
    .top-header { height: 50px; }
    .page-title { font-size: .85rem; }
    .stats-grid { grid-template-columns: 1fr 1fr !important; }
    .stat-card { padding: 10px 8px; }
    .stat-icon { width: 36px; height: 36px; font-size: 18px; }
    .stat-info h3 { font-size: 1rem; }
    .btn { padding: 8px 12px; font-size: .78rem; }
    .btn .material-symbols-rounded { font-size: 16px; }
    .data-table th, .data-table td { padding: 6px 8px; font-size: .75rem; }
    .card-header h2 { font-size: .88rem; }
    .card-header h2 .material-symbols-rounded { font-size: 18px; }
    .form-control { padding: 8px 10px; font-size: .85rem; }
    .quiz-option { padding: 10px 12px; font-size: .85rem; }
    .option-letter { width: 26px; height: 26px; font-size: .7rem; }
    .question-card-header { padding: 10px 12px; }

    /* Hide less important columns on very small screens */
    .hide-xs { display: none !important; }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-primary { color: var(--primary); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.d-flex { display: flex; }
.d-grid { display: grid; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.hidden { display: none !important; }

/* Mobile/Desktop toggle classes */
.desktop-only { display: block !important; }
.mobile-only { display: none !important; }
.hide-mobile { display: inline; }

@media (max-width: 768px) {
    .desktop-only { display: none !important; }
    .mobile-only { display: flex !important; }
    .hide-mobile { display: none !important; }
}

/* Mobile card list (used across admin/teacher/student pages) */
.mobile-card-list { display: none !important; flex-direction: column; gap: 10px; }
.mobile-card-item {
    background: var(--bg-body); border-radius: var(--radius-lg); padding: 14px 16px;
    border: 1px solid var(--border-light); transition: all .2s; display: block;
    text-decoration: none; color: inherit;
}
.mobile-card-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.mci-header { display: flex; justify-content: space-between; align-items: start; margin-bottom: 8px; }
.mci-title { font-weight: 700; font-size: .92rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mci-sub { font-size: .76rem; color: var(--text-muted); margin-top: 2px; }
.mci-body { display: flex; gap: 10px; flex-wrap: wrap; font-size: .8rem; color: var(--text-secondary); }
.mci-actions { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }

@media (max-width: 768px) {
    .mobile-card-list { display: flex !important; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ===== Dark Mode ===== */
[data-theme="dark"] {
    --bg-body: #0F172A;
    --bg-card: #1E293B;
    --bg-sidebar: #0F172A;
    --bg-sidebar-hover: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --text-sidebar: #CBD5E1;
    --border: #334155;
    --border-light: #1E293B;
    --primary-50: rgba(79,70,229,0.15);
    --primary-100: rgba(79,70,229,0.25);
    --success-light: rgba(16,185,129,0.15);
    --danger-light: rgba(239,68,68,0.15);
    --warning-light: rgba(245,158,11,0.15);
    --info-light: rgba(59,130,246,0.15);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
}

[data-theme="dark"] .login-page { background: linear-gradient(135deg, #1E1B4B 0%, #312E81 100%); }
[data-theme="dark"] .login-card { background: rgba(30,41,59,0.95); }
[data-theme="dark"] .login-card h1, [data-theme="dark"] .login-card .subtitle { color: var(--text-primary); }
[data-theme="dark"] .input-icon-wrap input { background: var(--bg-body); color: var(--text-primary); }
[data-theme="dark"] .data-table th { background: var(--bg-body); }
[data-theme="dark"] .quiz-option:hover { background: rgba(79,70,229,0.1); }
[data-theme="dark"] .quiz-option.selected { background: rgba(79,70,229,0.15); }
[data-theme="dark"] .option-letter { background: var(--bg-body); }
[data-theme="dark"] .stat-card { border-color: var(--border); }
[data-theme="dark"] .card { border-color: var(--border); }
[data-theme="dark"] .form-control { background: var(--bg-body); color: var(--text-primary); }
[data-theme="dark"] select.form-control { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394A3B8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E"); }
[data-theme="dark"] .progress-bar-wrap { background: #334155; }
[data-theme="dark"] .alert-success { background: rgba(16,185,129,0.15); border-left-color: var(--success); }
[data-theme="dark"] .alert-danger { background: rgba(239,68,68,0.15); border-left-color: var(--danger); }
[data-theme="dark"] .alert-warning { background: rgba(245,158,11,0.15); border-left-color: var(--warning); }
[data-theme="dark"] .alert-info { background: rgba(59,130,246,0.15); border-left-color: var(--info); }
[data-theme="dark"] .modal-box { background: var(--bg-card); }
[data-theme="dark"] .cheat-warning-content { background: var(--bg-card); }


/* =====================================================
   Round 7 — Mobile-first minimal colorful redesign
   ===================================================== */
:root {
    --accent-2: #EC4899;
    --success-strong: #059669;
    --surface-soft: rgba(255,255,255,.72);
    --surface-stroke: rgba(226,232,240,.78);
    --page-max: 1440px;
}

body.app-body {
    background:
        radial-gradient(circle at top left, rgba(79,70,229,.09), transparent 26%),
        radial-gradient(circle at top right, rgba(14,165,233,.09), transparent 20%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg-body) 18%, var(--bg-body) 100%);
}

body.app-body::selection { background: rgba(79,70,229,.16); }
body.sidebar-open { overflow: hidden; }

.app-layout {
    position: relative;
    isolation: isolate;
}

.sidebar {
    background:
        linear-gradient(180deg, rgba(15,23,42,.96) 0%, rgba(30,41,59,.98) 100%),
        linear-gradient(180deg, rgba(79,70,229,.10) 0%, transparent 60%);
    border-right: 1px solid rgba(148,163,184,.12);
    box-shadow: 20px 0 60px rgba(15,23,42,.22);
}
.sidebar-header {
    padding: 22px 18px;
    background: linear-gradient(180deg, rgba(255,255,255,.02), transparent);
    backdrop-filter: blur(10px);
}
.sidebar-nav { padding: 14px 12px 20px; }
.nav-section-title {
    color: rgba(203,213,225,.55);
    letter-spacing: .14em;
    margin-bottom: 10px;
}
.nav-item {
    min-height: 46px;
    border: 1px solid transparent;
    color: #dbe5f1;
}
.nav-item:hover {
    background: rgba(255,255,255,.08);
    border-color: rgba(148,163,184,.16);
    transform: translateX(2px);
}
.nav-item.active {
    background: linear-gradient(135deg, rgba(79,70,229,.95), rgba(14,165,233,.82));
    box-shadow: 0 10px 28px rgba(79,70,229,.26);
    border-color: rgba(255,255,255,.12);
}
.sidebar-user {
    background: rgba(255,255,255,.05);
    border: 1px solid rgba(148,163,184,.10);
    border-radius: 18px;
}
.user-avatar {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    box-shadow: 0 12px 24px rgba(79,70,229,.22);
}

.main-content {
    position: relative;
}
.top-header {
    margin: 14px 18px 0;
    width: calc(100% - 36px);
    max-width: calc(var(--page-max) - 36px);
    border-radius: 24px;
    border: 1px solid var(--surface-stroke);
    background: rgba(255,255,255,.74);
    backdrop-filter: blur(18px);
    box-shadow: 0 18px 48px rgba(15,23,42,.08);
}
.page-title {
    font-size: 1.18rem;
    letter-spacing: -0.02em;
}
.page-title small {
    margin-top: 2px;
    font-size: .78rem;
    color: var(--text-muted);
}
.header-btn, .menu-toggle {
    background: rgba(248,250,252,.92);
    border: 1px solid rgba(226,232,240,.9);
    box-shadow: 0 8px 18px rgba(15,23,42,.06);
}
.header-btn:hover, .menu-toggle:hover {
    transform: translateY(-1px);
}
.content-area {
    width: 100%;
    max-width: var(--page-max);
    margin: 0 auto;
    padding: 22px 24px 40px;
}

.stats-grid {
    gap: 16px;
}
.stat-card {
    position: relative;
    border-radius: 22px;
    border: 1px solid var(--surface-stroke);
    background: linear-gradient(180deg, rgba(255,255,255,.88), rgba(255,255,255,.82));
    box-shadow: 0 18px 42px rgba(15,23,42,.07);
    overflow: hidden;
}
.stat-card::after {
    content: '';
    position: absolute;
    inset: auto 0 0 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: .12;
}
.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 22px 54px rgba(15,23,42,.10);
}
.stat-icon {
    border-radius: 18px;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.45);
}
.stat-info h3 {
    letter-spacing: -0.03em;
}

.card {
    position: relative;
    border-radius: 24px;
    border: 1px solid var(--surface-stroke);
    background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.86));
    box-shadow: 0 18px 48px rgba(15,23,42,.08);
}
.card::before {
    content: '';
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(79,70,229,.18), rgba(14,165,233,.18), rgba(236,72,153,.14));
}
.card-header {
    padding: 20px 22px;
    background: linear-gradient(180deg, rgba(248,250,252,.72), rgba(255,255,255,0));
}
.card-header h2 {
    font-size: 1rem;
    letter-spacing: -0.02em;
}
.card-body { padding: 22px; }
.card-footer {
    background: rgba(248,250,252,.75);
}

.quiz-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}
.quiz-collection-card {
    overflow: hidden;
}
.quiz-collection-card .card-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.quiz-collection-card .card-body > div:last-child {
    margin-top: auto;
}

.table-wrap {
    border: 1px solid rgba(226,232,240,.85);
    border-radius: 20px;
    background: rgba(255,255,255,.82);
}
.data-table th {
    position: sticky;
    top: 0;
    z-index: 1;
    background: #f8fafc;
}
.data-table td, .data-table th { vertical-align: middle; }
.data-table tbody tr:hover { background: rgba(79,70,229,.05); }

.form-control {
    min-height: 46px;
    border-radius: 14px;
    border-width: 1px;
    background: rgba(255,255,255,.95);
    box-shadow: inset 0 1px 2px rgba(15,23,42,.04);
}
.form-control:focus {
    box-shadow: 0 0 0 4px rgba(79,70,229,.10);
}
textarea.form-control { min-height: 110px; }

.btn {
    min-height: 42px;
    border-radius: 14px;
    font-weight: 700;
    letter-spacing: -0.01em;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 14px 30px rgba(79,70,229,.24);
}
.btn-success {
    background: linear-gradient(135deg, var(--success-strong), var(--success));
    box-shadow: 0 14px 30px rgba(5,150,105,.22);
}
.btn-outline {
    border-width: 1px;
    background: rgba(255,255,255,.7);
}
.btn-secondary {
    border: 1px solid rgba(226,232,240,.9);
    background: rgba(248,250,252,.92);
}
.btn-sm { min-height: 38px; border-radius: 12px; }
.btn-lg { min-height: 48px; border-radius: 16px; }

.badge-status {
    min-height: 30px;
    border: 1px solid transparent;
}
.badge-quiz { background: rgba(59,130,246,.10); color: var(--info); border-color: rgba(59,130,246,.18); }
.badge-survey { background: rgba(236,72,153,.10); color: var(--accent-2); border-color: rgba(236,72,153,.18); }
.badge-published { border-color: rgba(16,185,129,.16); }
.badge-draft { border-color: rgba(245,158,11,.16); }
.badge-closed, .badge-failed { border-color: rgba(239,68,68,.16); }

.empty-state {
    padding: 56px 20px;
}
.empty-state .icon {
    width: 88px;
    height: 88px;
    margin: 0 auto 18px;
    border-radius: 26px;
    background: linear-gradient(135deg, rgba(79,70,229,.10), rgba(14,165,233,.12));
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.quiz-question-card {
    border-radius: 22px;
    border: 1px solid var(--surface-stroke);
    box-shadow: 0 18px 40px rgba(15,23,42,.08);
}
.quiz-option {
    border-radius: 16px;
}
.progress-bar-wrap {
    border-radius: 999px;
    background: rgba(226,232,240,.9);
}
.progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent-2));
}
.modal-box, .cheat-warning-content {
    border-radius: 24px;
    border: 1px solid var(--surface-stroke);
}
.score-display {
    padding: 8px 0;
}
.score-circle {
    box-shadow: inset 0 0 0 10px rgba(255,255,255,.7), 0 18px 42px rgba(15,23,42,.08);
}

.mobile-bottom-nav {
    display: none;
}

@media (max-width: 1024px) {
    .top-header {
        margin: 10px 10px 0;
        width: calc(100% - 20px);
        max-width: none;
        border-radius: 18px;
    }
    .content-area {
        padding: 16px 14px 92px;
    }
    .sidebar {
        width: min(88vw, 320px);
    }
}

@media (max-width: 768px) {
    .top-header {
        height: 62px;
        padding: 0 12px;
    }
    .header-right { gap: 8px; }
    .header-btn, .menu-toggle { width: 38px; height: 38px; }
    .page-title {
        font-size: 1rem;
        max-width: calc(100vw - 130px);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .page-title small {
        white-space: normal;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .content-area {
        padding: 14px 12px calc(94px + env(safe-area-inset-bottom));
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr !important;
        gap: 10px !important;
    }
    .stat-card {
        padding: 14px 12px;
        border-radius: 18px;
        gap: 12px;
    }
    .stat-card .stat-icon {
        width: 42px;
        height: 42px;
        border-radius: 14px;
    }
    .card,
    .modal-box,
    .cheat-warning-content,
    .quiz-question-card,
    .quiz-top-bar {
        border-radius: 20px;
    }
    .card-header,
    .card-body,
    .card-footer {
        padding-left: 16px;
        padding-right: 16px;
    }
    .table-wrap {
        margin: 0 -4px;
        border-radius: 18px;
    }
    .data-table { min-width: 720px; }
    .form-control { min-height: 44px; }
    .quiz-card-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .mobile-bottom-nav {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        position: fixed;
        left: 10px;
        right: 10px;
        bottom: calc(10px + env(safe-area-inset-bottom));
        z-index: 1300;
        padding: 8px;
        gap: 6px;
        border-radius: 22px;
        background: rgba(15,23,42,.92);
        backdrop-filter: blur(18px);
        border: 1px solid rgba(148,163,184,.12);
        box-shadow: 0 20px 48px rgba(15,23,42,.22);
    }
    .mobile-bottom-link {
        min-height: 54px;
        border-radius: 16px;
        color: rgba(226,232,240,.78);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 4px;
        font-size: .7rem;
        font-weight: 700;
        letter-spacing: -.01em;
    }
    .mobile-bottom-link .material-symbols-rounded {
        font-size: 21px;
    }
    .mobile-bottom-link.active {
        background: linear-gradient(135deg, rgba(79,70,229,.95), rgba(14,165,233,.82));
        color: #fff;
        box-shadow: 0 10px 24px rgba(79,70,229,.26);
    }
    .mobile-bottom-link:hover { color: #fff; }
}

@media (max-width: 480px) {
    .top-header {
        margin: 8px 8px 0;
        width: calc(100% - 16px);
        border-radius: 16px;
    }
    .content-area {
        padding: 12px 10px calc(96px + env(safe-area-inset-bottom));
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr !important;
    }
    .stat-card {
        padding: 12px 10px;
    }
    .stat-info h3 { font-size: 1.05rem; }
    .stat-info p { font-size: .71rem; }
    .btn { width: 100%; justify-content: center; }
    .btn-sm { width: auto; }
    .quiz-actions .btn-sm { width: 100%; }
    .mobile-bottom-nav {
        left: 8px;
        right: 8px;
        bottom: calc(8px + env(safe-area-inset-bottom));
    }
}

[data-theme="dark"] body.app-body {
    background:
        radial-gradient(circle at top left, rgba(79,70,229,.18), transparent 26%),
        radial-gradient(circle at top right, rgba(14,165,233,.14), transparent 22%),
        linear-gradient(180deg, #0b1220 0%, var(--bg-body) 16%, var(--bg-body) 100%);
}
[data-theme="dark"] .top-header,
[data-theme="dark"] .card,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .table-wrap,
[data-theme="dark"] .quiz-top-bar,
[data-theme="dark"] .quiz-summary-strip .card-body > div,
[data-theme="dark"] .quiz-actions {
    background: rgba(15,23,42,.78);
    border-color: rgba(51,65,85,.92);
}
[data-theme="dark"] .header-btn,
[data-theme="dark"] .menu-toggle,
[data-theme="dark"] .btn-secondary,
[data-theme="dark"] .form-control,
[data-theme="dark"] .table-wrap {
    background: rgba(15,23,42,.84);
}
[data-theme="dark"] .mobile-bottom-nav {
    background: rgba(2,8,23,.92);
}

/* ===== Round 8 mobile-first redesign ===== */
:root{
    --hero-grad-a: rgba(79,70,229,.14);
    --hero-grad-b: rgba(14,165,233,.14);
    --hero-grad-c: rgba(236,72,153,.12);
}
.page-hero{
    position:relative;
    overflow:hidden;
    border-radius:28px;
    border:1px solid var(--surface-stroke);
    background:
        radial-gradient(circle at top left, var(--hero-grad-a), transparent 38%),
        radial-gradient(circle at top right, var(--hero-grad-b), transparent 34%),
        linear-gradient(180deg, rgba(255,255,255,.96), rgba(255,255,255,.88));
    box-shadow:0 24px 52px rgba(15,23,42,.08);
    padding:24px;
    margin-bottom:18px;
}
.page-hero::before{
    content:'';
    position:absolute;
    inset:0;
    background:linear-gradient(120deg, transparent, rgba(255,255,255,.45), transparent);
    opacity:.55;
    pointer-events:none;
}
.page-hero-content{
    position:relative;
    display:grid;
    grid-template-columns:minmax(0,1.55fr) minmax(280px,1fr);
    gap:18px;
    align-items:stretch;
}
.hero-copy{display:flex;flex-direction:column;gap:12px}
.hero-kicker{
    display:inline-flex;
    align-items:center;
    gap:8px;
    width:max-content;
    padding:7px 12px;
    border-radius:999px;
    background:rgba(255,255,255,.78);
    border:1px solid rgba(148,163,184,.22);
    color:var(--text-secondary);
    font-size:.82rem;
    font-weight:700;
}
.hero-title{
    margin:0;
    font-size:clamp(1.32rem,2vw,1.85rem);
    letter-spacing:-.03em;
    line-height:1.15;
}
.hero-desc{
    margin:0;
    color:var(--text-secondary);
    line-height:1.7;
    font-size:.94rem;
}
.hero-chip-row,.chip-row{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
}
.soft-chip{
    display:inline-flex;
    align-items:center;
    gap:6px;
    min-height:32px;
    padding:6px 12px;
    border-radius:999px;
    background:rgba(255,255,255,.78);
    border:1px solid rgba(226,232,240,.95);
    color:var(--text-secondary);
    font-size:.8rem;
    font-weight:700;
}
.hero-side{
    position:relative;
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:12px;
}
.hero-mini-card{
    display:flex;
    flex-direction:column;
    justify-content:center;
    gap:4px;
    min-height:96px;
    padding:16px;
    border-radius:20px;
    border:1px solid rgba(226,232,240,.9);
    background:rgba(255,255,255,.76);
    box-shadow:0 14px 28px rgba(15,23,42,.05);
}
.hero-mini-card strong{
    font-size:1.28rem;
    letter-spacing:-.03em;
}
.hero-mini-card span{
    color:var(--text-muted);
    font-size:.8rem;
}
.page-section-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
    gap:18px;
}
.section-stack{
    display:flex;
    flex-direction:column;
    gap:18px;
}
.quick-action-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(170px,1fr));
    gap:10px;
}
.filter-panel{
    position:relative;
    overflow:hidden;
}
.filter-actions-inline{
    display:flex;
    gap:8px;
    flex-wrap:wrap;
}
.mini-meta{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    color:var(--text-secondary);
    font-size:.82rem;
}
.list-stack{
    display:flex;
    flex-direction:column;
    gap:12px;
}
.list-card{
    display:flex;
    gap:12px;
    align-items:flex-start;
    padding:14px;
    border-radius:18px;
    border:1px solid var(--border-light);
    background:linear-gradient(180deg, rgba(255,255,255,.94), rgba(248,250,252,.86));
}
.list-card-icon{
    width:44px;
    height:44px;
    flex-shrink:0;
    display:grid;
    place-items:center;
    border-radius:14px;
    color:#fff;
    background:linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow:0 12px 22px rgba(79,70,229,.18);
}
.list-card-body{
    display:flex;
    flex-direction:column;
    gap:6px;
    min-width:0;
    flex:1;
}
.list-card-title{
    font-weight:800;
    letter-spacing:-.02em;
    line-height:1.3;
}
.list-card-desc{
    color:var(--text-secondary);
    font-size:.84rem;
    line-height:1.6;
}
.list-card-meta{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
    font-size:.78rem;
    color:var(--text-muted);
}
.metric-grid-compact{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
    gap:8px;
}
.metric-pill{
    padding:10px 12px;
    border-radius:16px;
    background:var(--bg-body);
    border:1px solid var(--border-light);
    font-size:.8rem;
    color:var(--text-secondary);
}
.metric-pill strong{
    display:block;
    font-size:1rem;
    color:var(--text-primary);
    margin-top:2px;
}
.mobile-summary-list{
    display:none;
    flex-direction:column;
    gap:12px;
    padding:14px;
}
.mobile-summary-card{
    padding:14px;
    border-radius:18px;
    border:1px solid var(--border-light);
    background:linear-gradient(180deg, rgba(255,255,255,.96), rgba(248,250,252,.88));
    box-shadow:0 12px 28px rgba(15,23,42,.05);
}
.mobile-summary-card h4{
    margin:0 0 6px;
    font-size:.96rem;
    letter-spacing:-.02em;
}
.mobile-summary-card p{
    margin:0;
    color:var(--text-secondary);
    font-size:.84rem;
    line-height:1.65;
}
.mobile-summary-meta{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
    margin-top:10px;
}
.mobile-summary-meta span{
    padding:5px 10px;
    border-radius:999px;
    background:var(--bg-body);
    border:1px solid var(--border-light);
    color:var(--text-secondary);
    font-size:.76rem;
}
.dual-panel{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:18px;
}
.dashboard-actions{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:10px;
}
.section-caption{
    color:var(--text-muted);
    font-size:.82rem;
    margin-top:4px;
}
.table-card-body{padding:0}
.results-summary-note{
    color:var(--text-muted);
    font-size:.82rem;
}
@media (max-width: 1024px){
    .page-hero-content{grid-template-columns:1fr}
}
@media (max-width: 768px){
    .page-hero{
        padding:18px 16px;
        border-radius:24px;
        margin-bottom:14px;
    }
    .hero-side{
        grid-template-columns:repeat(2,minmax(0,1fr));
    }
    .hero-mini-card{
        min-height:82px;
        border-radius:18px;
        padding:14px;
    }
    .page-section-grid,
    .dual-panel{
        grid-template-columns:1fr;
        gap:14px;
    }
    .quick-action-grid,
    .dashboard-actions{
        grid-template-columns:1fr 1fr;
    }
    .mobile-summary-list{
        display:flex;
    }
}
@media (max-width: 480px){
    .page-hero{
        padding:16px 14px;
        border-radius:22px;
    }
    .hero-side{
        grid-template-columns:1fr 1fr;
        gap:10px;
    }
    .hero-mini-card{
        min-height:74px;
        padding:12px;
    }
    .hero-mini-card strong{font-size:1.08rem}
    .hero-desc{font-size:.88rem}
    .quick-action-grid,
    .dashboard-actions{
        grid-template-columns:1fr;
    }
}
[data-theme="dark"] .page-hero,
[data-theme="dark"] .hero-mini-card,
[data-theme="dark"] .mobile-summary-card,
[data-theme="dark"] .list-card{
    background:linear-gradient(180deg, rgba(15,23,42,.86), rgba(15,23,42,.78));
    border-color:rgba(51,65,85,.94);
}
[data-theme="dark"] .hero-kicker,
[data-theme="dark"] .soft-chip,
[data-theme="dark"] .metric-pill,
[data-theme="dark"] .mobile-summary-meta span{
    background:rgba(15,23,42,.9);
    border-color:rgba(51,65,85,.94);
}

/* =====================================================
   Round 9 — Teacher workspace builder redesign
   ===================================================== */
.teacher-workspace-hero .hero-side{grid-template-columns:repeat(3,minmax(0,1fr));}
.workspace-shell{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.8fr);gap:18px;align-items:start}
.workspace-main,.workspace-side{display:flex;flex-direction:column;gap:18px;min-width:0}
.workspace-side{position:sticky;top:86px}
.workspace-card{position:relative;overflow:hidden;border-radius:24px;border:1px solid rgba(226,232,240,.9);background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(248,250,252,.9));box-shadow:0 18px 36px rgba(15,23,42,.06)}
.workspace-card .card-header{background:transparent;border-bottom:1px solid rgba(226,232,240,.75);padding:18px 20px 14px}
.workspace-card .card-body{padding:18px 20px 20px}
.workspace-card .card-header h2{font-size:1rem;letter-spacing:-.02em;display:flex;align-items:center;gap:8px}
.workspace-card .card-header p{margin:6px 0 0;color:var(--text-secondary);font-size:.83rem}
.workspace-card.compact .card-body{padding:16px 18px}
.workspace-subtle{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border-radius:18px;background:var(--bg-body);border:1px solid var(--border-light)}
.workspace-subtle .material-symbols-rounded{font-size:22px;color:var(--primary);margin-top:1px}
.workspace-subtle h4{margin:0 0 4px;font-size:.92rem}.workspace-subtle p{margin:0;color:var(--text-secondary);font-size:.82rem;line-height:1.65}
.workspace-kpi-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.workspace-kpi{padding:14px;border-radius:18px;border:1px solid var(--border-light);background:linear-gradient(180deg,rgba(255,255,255,.95),rgba(248,250,252,.88))}
.workspace-kpi strong{display:block;font-size:1.16rem;letter-spacing:-.03em}.workspace-kpi span{display:block;font-size:.78rem;color:var(--text-muted);margin-top:3px}
.workspace-badge-row{display:flex;flex-wrap:wrap;gap:8px}
.workspace-badge{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:999px;background:rgba(79,70,229,.08);color:var(--primary-dark);border:1px solid rgba(129,140,248,.16);font-size:.8rem;font-weight:700}
.workspace-action-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.workspace-action-card{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:18px;border:1px solid var(--border-light);background:var(--bg-card);color:inherit;text-decoration:none}
.workspace-action-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm);border-color:rgba(129,140,248,.45)}
.workspace-action-card .material-symbols-rounded{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--secondary));color:white;box-shadow:0 12px 22px rgba(79,70,229,.16)}
.workspace-action-card strong{display:block;font-size:.9rem}.workspace-action-card span:last-child{display:block;color:var(--text-secondary);font-size:.78rem;margin-top:2px}
.builder-intro{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:16px}
.builder-intro p{margin:6px 0 0;color:var(--text-secondary);font-size:.84rem}
.question-card{border-radius:24px;box-shadow:0 16px 32px rgba(15,23,42,.05)}
.question-card-header{padding:14px 16px;background:linear-gradient(180deg,rgba(248,250,252,.96),rgba(241,245,249,.9))}
.question-card-body{padding:18px 16px 16px}
.question-meta-inline{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.question-meta-inline .form-control{min-width:110px}
.question-empty-state{padding:26px 18px;border:2px dashed rgba(129,140,248,.22);border-radius:24px;background:rgba(79,70,229,.03);text-align:center}
.question-empty-state .material-symbols-rounded{font-size:46px;color:var(--primary);opacity:.9}.question-empty-state h3{margin:10px 0 4px;font-size:1rem}.question-empty-state p{margin:0;color:var(--text-secondary);font-size:.84rem}
.sticky-submit-bar{position:sticky;bottom:calc(72px + env(safe-area-inset-bottom));z-index:30;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding:14px 16px;border-radius:22px;border:1px solid rgba(226,232,240,.85);background:rgba(255,255,255,.92);backdrop-filter:blur(18px);box-shadow:0 18px 32px rgba(15,23,42,.12)}
.sticky-submit-bar .meta{display:flex;flex-wrap:wrap;gap:8px;color:var(--text-secondary);font-size:.8rem}.sticky-submit-bar .actions{display:flex;gap:10px;flex-wrap:wrap}
.library-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.library-card{display:flex;flex-direction:column;gap:12px;padding:16px;border-radius:22px;border:1px solid var(--border-light);background:linear-gradient(180deg,rgba(255,255,255,.97),rgba(248,250,252,.9));box-shadow:0 12px 28px rgba(15,23,42,.04)}
.library-card-head{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.library-card-title{font-size:.95rem;font-weight:800;line-height:1.35;letter-spacing:-.02em}.library-card-sub{color:var(--text-secondary);font-size:.8rem}
.library-card-meta{display:flex;flex-wrap:wrap;gap:8px;font-size:.78rem;color:var(--text-muted)}.library-card-actions{display:flex;flex-wrap:wrap;gap:8px}
.split-search{display:grid;grid-template-columns:minmax(0,1fr) auto auto auto;gap:10px;align-items:center}
[data-theme="dark"] .workspace-card,[data-theme="dark"] .workspace-kpi,[data-theme="dark"] .workspace-action-card,[data-theme="dark"] .library-card,[data-theme="dark"] .sticky-submit-bar,[data-theme="dark"] .question-card,[data-theme="dark"] .question-empty-state{background:linear-gradient(180deg,rgba(15,23,42,.92),rgba(15,23,42,.82));border-color:rgba(51,65,85,.95)}
[data-theme="dark"] .question-card-header{background:linear-gradient(180deg,rgba(30,41,59,.86),rgba(15,23,42,.9))}
[data-theme="dark"] .workspace-subtle{background:rgba(15,23,42,.84);border-color:rgba(51,65,85,.95)}
@media (max-width: 1180px){.workspace-shell{grid-template-columns:1fr}.workspace-side{position:static}}
@media (max-width: 768px){.teacher-workspace-hero .hero-side{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace-card{border-radius:22px}.workspace-card .card-header{padding:16px 16px 12px}.workspace-card .card-body{padding:16px}.workspace-action-grid,.split-search{grid-template-columns:1fr}.question-card-header{padding:12px 12px;align-items:flex-start}.question-meta-inline{width:100%}.question-meta-inline .form-control{flex:1;min-width:0;width:100%}.option-item{align-items:flex-start;padding:12px}.option-item .form-control{min-width:0}.sticky-submit-bar{bottom:calc(78px + env(safe-area-inset-bottom));padding:12px 14px;border-radius:20px}.sticky-submit-bar .actions{width:100%}.sticky-submit-bar .actions .btn{flex:1;min-width:0}}
@media (max-width: 480px){.teacher-workspace-hero .hero-side{grid-template-columns:1fr 1fr}.workspace-kpi-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}


/* =====================================================
   Round 10 — Survey builder + assignment mobile redesign
   ===================================================== */
.survey-workspace-hero .hero-side,.assign-workspace-hero .hero-side{grid-template-columns:repeat(3,minmax(0,1fr));}
.section-stack{display:flex;flex-direction:column;gap:18px}
.builder-toolbar{display:flex;flex-wrap:wrap;gap:8px}
.builder-toolbar .btn{border-radius:14px}
.mini-stat-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}
.mini-stat{padding:14px;border-radius:18px;background:var(--bg-body);border:1px solid var(--border-light)}
.mini-stat strong{display:block;font-size:1.05rem;letter-spacing:-.02em}.mini-stat span{display:block;font-size:.78rem;color:var(--text-muted);margin-top:3px}
.mode-choice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.mode-choice-card{position:relative;padding:16px 16px 18px;border-radius:22px;border:1px solid var(--border-light);background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(248,250,252,.9));cursor:pointer;transition:.22s ease;box-shadow:0 12px 24px rgba(15,23,42,.04)}
.mode-choice-card:hover{transform:translateY(-1px);border-color:rgba(129,140,248,.38);box-shadow:0 16px 28px rgba(79,70,229,.08)}
.mode-choice-card input{position:absolute;inset:0;opacity:0;cursor:pointer}
.mode-choice-card .icon{width:46px;height:46px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:0 12px 22px rgba(79,70,229,.18);margin-bottom:12px}
.mode-choice-card strong{display:block;font-size:.95rem;letter-spacing:-.02em}
.mode-choice-card p{margin:6px 0 0;font-size:.8rem;color:var(--text-secondary);line-height:1.65}
.mode-choice-card.active{border-color:rgba(79,70,229,.45);background:linear-gradient(180deg,rgba(238,242,255,.96),rgba(255,255,255,.94));box-shadow:0 18px 28px rgba(79,70,229,.12)}
.assign-panel{display:none}.assign-panel.active{display:block}
.assign-selection-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px}
.assign-selection-card{position:relative;display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:20px;border:1px solid var(--border-light);background:linear-gradient(180deg,rgba(255,255,255,.97),rgba(248,250,252,.88));cursor:pointer;transition:.2s ease}
.assign-selection-card:hover{border-color:rgba(129,140,248,.36);transform:translateY(-1px)}
.assign-selection-card input{margin-top:3px;accent-color:var(--primary);width:18px;height:18px}
.assign-selection-card strong{display:block;font-size:.92rem}.assign-selection-card span{display:block;color:var(--text-secondary);font-size:.8rem;margin-top:3px;line-height:1.55}
.assign-selection-card.active{border-color:rgba(79,70,229,.42);background:linear-gradient(180deg,rgba(238,242,255,.94),rgba(255,255,255,.96));box-shadow:0 14px 24px rgba(79,70,229,.08)}
.assign-student-toolbar{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:10px;align-items:center;margin-bottom:12px}
.assign-student-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;max-height:560px;overflow:auto;padding-right:2px}
.assign-student-card{position:relative;padding:14px 14px 15px;border-radius:22px;border:1px solid var(--border-light);background:linear-gradient(180deg,rgba(255,255,255,.98),rgba(248,250,252,.9));box-shadow:0 10px 24px rgba(15,23,42,.04);transition:.2s ease}
.assign-student-card:hover{transform:translateY(-1px);border-color:rgba(129,140,248,.34)}
.assign-student-card label{display:flex;gap:12px;align-items:flex-start;cursor:pointer}
.assign-student-card input{margin-top:3px;accent-color:var(--primary);width:18px;height:18px}
.assign-student-card strong{display:block;font-size:.92rem;line-height:1.35}.assign-student-card .meta{margin-top:6px;display:flex;flex-wrap:wrap;gap:8px;font-size:.77rem;color:var(--text-muted)}
.assign-student-card.active{border-color:rgba(79,70,229,.42);background:linear-gradient(180deg,rgba(238,242,255,.94),rgba(255,255,255,.96));box-shadow:0 14px 24px rgba(79,70,229,.08)}
.info-slab{display:flex;gap:12px;align-items:flex-start;padding:16px;border-radius:20px;border:1px solid rgba(191,219,254,.7);background:linear-gradient(180deg,rgba(239,246,255,.96),rgba(255,255,255,.95))}
.info-slab .material-symbols-rounded{color:#2563eb;font-size:22px;margin-top:2px}
.info-slab strong{display:block;font-size:.9rem}.info-slab p{margin:4px 0 0;color:var(--text-secondary);font-size:.8rem;line-height:1.7}
.compact-list{display:flex;flex-direction:column;gap:10px}
.compact-list-item{display:flex;justify-content:space-between;gap:12px;padding:12px 14px;border-radius:16px;border:1px solid var(--border-light);background:var(--bg-body);font-size:.82rem}
.compact-list-item strong{font-size:.86rem}
.data-note{font-size:.79rem;color:var(--text-secondary);line-height:1.7}
[data-theme="dark"] .mode-choice-card,[data-theme="dark"] .assign-selection-card,[data-theme="dark"] .assign-student-card,[data-theme="dark"] .mini-stat,[data-theme="dark"] .info-slab,[data-theme="dark"] .compact-list-item{background:linear-gradient(180deg,rgba(15,23,42,.92),rgba(15,23,42,.82));border-color:rgba(51,65,85,.95)}
@media (max-width: 980px){.mode-choice-grid{grid-template-columns:1fr}.survey-workspace-hero .hero-side,.assign-workspace-hero .hero-side{grid-template-columns:repeat(2,minmax(0,1fr))}.assign-student-toolbar{grid-template-columns:1fr}.assign-student-grid{max-height:none}}
@media (max-width: 560px){.survey-workspace-hero .hero-side,.assign-workspace-hero .hero-side{grid-template-columns:1fr 1fr}.builder-toolbar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.builder-toolbar .btn{justify-content:center}.assign-selection-grid,.assign-student-grid{grid-template-columns:1fr}.mini-stat-list{grid-template-columns:1fr 1fr}}


.builder-bottom-inline{border-top:1px solid var(--border-light);display:flex;flex-direction:column;gap:12px;background:linear-gradient(180deg,rgba(99,102,241,.04),rgba(255,255,255,.72));}
.builder-bottom-inline-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap}
.builder-bottom-inline-head h3{margin:0;font-size:1rem;color:var(--text-primary)}
.builder-bottom-inline-head p{margin:4px 0 0;color:var(--text-secondary);font-size:.84rem}
.builder-toolbar-bottom{padding-top:2px}
.mobile-question-toolbox{display:none}
@media (max-width: 768px){
  .workspace-main.section-stack{padding-bottom:255px}
  .mobile-question-toolbox{display:block;position:fixed;left:12px;right:12px;bottom:calc(156px + env(safe-area-inset-bottom));z-index:35;padding:12px;border:1px solid rgba(226,232,240,.9);border-radius:22px;background:rgba(255,255,255,.94);backdrop-filter:blur(18px);box-shadow:0 18px 32px rgba(15,23,42,.16)}
  .mobile-question-toolbox-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}
  .mobile-question-toolbox-head strong{display:flex;align-items:center;gap:6px;font-size:.88rem;color:var(--text-primary)}
  .mobile-question-toolbox-body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .mobile-question-toolbox-body .btn{justify-content:center;border-radius:14px;padding:10px 8px}
  .mobile-question-toolbox.collapsed{padding-bottom:10px}
  .mobile-question-toolbox.collapsed .mobile-question-toolbox-head{margin-bottom:0}
  .builder-bottom-inline{padding-bottom:8px}
}
@media (max-width: 560px){
  .workspace-main.section-stack{padding-bottom:286px}
  .mobile-question-toolbox{left:10px;right:10px;bottom:calc(148px + env(safe-area-inset-bottom));border-radius:20px}
  .builder-bottom-inline-head .btn{width:100%}
}
[data-theme="dark"] .builder-bottom-inline,[data-theme="dark"] .mobile-question-toolbox{background:linear-gradient(180deg,rgba(15,23,42,.94),rgba(15,23,42,.9));border-color:rgba(51,65,85,.95)}

/* Sidebar collapsible sections + contextual focus */
.sidebar-context-switch {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 0 4px 14px;
}

.sidebar-context-btn {
    min-height: 42px;
    border-radius: 14px;
    border: 1px solid rgba(148,163,184,.14);
    background: rgba(255,255,255,.05);
    color: #dbe5f1;
    font-size: .78rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 0 10px;
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-context-btn .material-symbols-rounded {
    font-size: 18px;
}

.sidebar-context-btn:hover {
    background: rgba(255,255,255,.08);
    border-color: rgba(148,163,184,.22);
}

.sidebar-context-btn.active {
    background: linear-gradient(135deg, rgba(79,70,229,.95), rgba(14,165,233,.82));
    color: #fff;
    border-color: rgba(255,255,255,.12);
    box-shadow: 0 12px 28px rgba(79,70,229,.22);
}

.nav-section-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border: 0;
    background: transparent;
    padding: 0 10px;
    margin-bottom: 10px;
    cursor: pointer;
    text-align: left;
}

.nav-section-trigger:hover .nav-section-title,
.nav-section-trigger:hover .nav-section-chevron {
    color: #f8fafc;
}

.nav-section-title {
    margin-bottom: 0;
    padding: 0;
}

.nav-section-chevron {
    font-size: 18px;
    color: rgba(203,213,225,.55);
    transition: transform .2s ease, color .2s ease;
}

.nav-section-items {
    overflow: hidden;
    transition: max-height .24s ease, opacity .2s ease, transform .2s ease, margin .2s ease;
    max-height: 1200px;
    opacity: 1;
    transform: translateY(0);
}

.nav-section.is-collapsed .nav-section-chevron {
    transform: rotate(-90deg);
}

.nav-section.is-collapsed .nav-section-items {
    max-height: 0;
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
}

.nav-section.is-hidden-by-mode {
    display: none;
}

@media (max-width: 1200px) {
    .sidebar-context-switch {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .sidebar-context-switch {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .sidebar-context-switch {
        gap: 6px;
        padding-bottom: 12px;
    }

    .sidebar-context-btn {
        min-height: 40px;
        font-size: .72rem;
        padding: 0 8px;
    }

    .nav-section-trigger {
        padding-inline: 8px;
    }
}


/* ===== Safe additions after baseline restore ===== */
body.page-home .top-header{display:none;}
.nav-item.nav-logout{color:#fecaca;border:1px solid rgba(239,68,68,.18);background:rgba(239,68,68,.08);}
.nav-item.nav-logout:hover{background:rgba(239,68,68,.16);color:#fff;border-color:rgba(239,68,68,.28);}
.nav-item.nav-logout .material-symbols-rounded{color:#f87171;}
.nav-item.nav-logout:hover .material-symbols-rounded{color:#fff;}