:root {
    --questudy-primary: #6366f1;
    --questudy-primary-hover: #4f46e5;
    --questudy-primary-light: #eef2ff;
    --questudy-primary-dark: #3730a3;
    --questudy-primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --questudy-secondary: #64748b;
    --questudy-success: #10b981;
    --questudy-success-light: #d1fae5;
    --questudy-error: #ef4444;
    --questudy-error-light: #fee2e2;
    --questudy-warning: #f59e0b;
    --questudy-warning-light: #fef3c7;
    --questudy-bg: #f8fafc;
    --questudy-card-bg: #ffffff;
    --questudy-border: #e2e8f0;
    --questudy-text: #0f172a;
    --questudy-text-light: #64748b;
    --questudy-radius: 16px;
    --questudy-radius-sm: 10px;
    --questudy-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
    --questudy-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 10px 15px -3px rgba(0,0,0,0.08);
    --questudy-shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 20px 40px -4px rgba(0,0,0,0.12);
    --questudy-shadow-xl: 0 20px 50px -12px rgba(0,0,0,0.15);
    --questudy-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --questudy-transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.questudy-generator-wrap, .questudy-exam-interface, .questudy-results-wrap,
.questudy-past-questions-wrap, .questudy-dashboard-wrap, .questudy-review-wrap,
.questudy-auth-wrap, .questudy-competition-wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 32px 20px;
    color: var(--questudy-text);
}

.questudy-auth-wrap { max-width: 480px; }

/* ===== Headers ===== */
.questudy-gen-header,
.questudy-pq-header,
.questudy-dashboard-header,
.questudy-auth-header {
    background: var(--questudy-card-bg);
    border: none;
    border-radius: var(--questudy-radius);
    box-shadow: var(--questudy-shadow-md);
    margin-bottom: 28px;
    overflow: hidden;
    padding: 32px 36px;
    position: relative;
    text-align: left;
}

.questudy-gen-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--questudy-primary-gradient);
    border-radius: 0 4px 4px 0;
}

.questudy-gen-header::after { content: none; }

.questudy-eyebrow {
    color: var(--questudy-primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.8px;
    margin-bottom: 10px;
    text-transform: uppercase;
    background: var(--questudy-primary-light);
    padding: 4px 12px;
    border-radius: 100px;
}

.questudy-gen-header h2,
.questudy-pq-header h2,
.questudy-dashboard-header h2,
.questudy-auth-header h2,
.questudy-results-header h2 {
    color: var(--questudy-text);
    font-size: 28px;
    font-weight: 800;
    line-height: 1.2;
    margin: 0 0 8px;
    letter-spacing: -0.5px;
}

.questudy-gen-header p,
.questudy-pq-header p,
.questudy-dashboard-header p,
.questudy-auth-header p {
    color: var(--questudy-text-light);
    font-size: 15px;
    line-height: 1.6;
    margin: 0;
    max-width: 600px;
}

/* ===== Cards ===== */
.qg-section,
.questudy-pq-filters,
.questudy-mini-chart,
.questudy-score-card,
.questudy-register-form,
.questudy-paper-card,
.questudy-stat-card,
.questudy-weak-card,
.questudy-review-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    box-shadow: var(--questudy-shadow);
    transition: all var(--questudy-transition);
}

.qg-section:hover,
.questudy-paper-card:hover,
.questudy-stat-card:hover,
.questudy-action-card:hover,
.questudy-weak-card:hover {
    box-shadow: var(--questudy-shadow-lg);
    transform: translateY(-2px);
}

.qg-section,
.questudy-pq-filters,
.questudy-register-form {
    padding: 28px;
}

/* ===== Form Grid ===== */
.questudy-form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

/* ===== Section Titles ===== */
.qg-section-title,
.questudy-dashboard-section h3 {
    font-size: 14px;
    font-weight: 700;
    color: var(--questudy-text);
    text-transform: none;
    letter-spacing: 0;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--questudy-border);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.qg-section-title::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--questudy-primary-gradient);
    border-radius: 4px;
    flex-shrink: 0;
}

.questudy-dashboard-section h3::after { content: none; }

/* ===== Form Elements ===== */
.questudy-input,
.questudy-select,
.questudy-register-form .regular-text {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
    font-size: 14px;
    font-family: inherit;
    line-height: 1.5;
    color: var(--questudy-text);
    background: var(--questudy-card-bg);
    transition: all var(--questudy-transition);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
    min-height: 44px;
}

.questudy-input:focus,
.questudy-select:focus,
.questudy-register-form .regular-text:focus {
    outline: none;
    border-color: var(--questudy-primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
    background-color: #fff;
}

.questudy-input::placeholder { color: #94a3b8; }

.qg-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--questudy-text);
    margin-bottom: 8px;
}

.qg-hint {
    display: block;
    font-size: 12px;
    color: var(--questudy-text-light);
    margin-top: 6px;
    line-height: 1.4;
}

/* ===== Checkboxes ===== */
.qg-checkboxes { display: flex; flex-direction: column; gap: 8px; }

.qg-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 18px;
    border-radius: var(--questudy-radius-sm);
    cursor: pointer;
    transition: all var(--questudy-transition);
    border: 1.5px solid var(--questudy-border);
    background: var(--questudy-card-bg);
}

.qg-checkbox:hover {
    background: var(--questudy-primary-light);
    border-color: #c7d2fe;
}

.qg-checkbox input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.qg-checkbox-mark {
    position: relative;
    top: 2px;
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border: 2px solid #cbd5e1;
    border-radius: 6px;
    transition: all var(--questudy-transition);
    background: #fff;
}

.qg-checkbox:hover .qg-checkbox-mark { border-color: var(--questudy-primary); }

.qg-checkbox input:checked + .qg-checkbox-mark {
    background: var(--questudy-primary);
    border-color: var(--questudy-primary);
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.qg-checkbox input:checked + .qg-checkbox-mark::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 7px;
    width: 5px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.qg-checkbox-text {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
}

.qg-checkbox-text strong {
    font-size: 14px;
    font-weight: 600;
    color: var(--questudy-text);
}

.qg-checkbox-text span {
    font-size: 13px;
    color: var(--questudy-text-light);
    line-height: 1.4;
}

.qg-penalty {
    padding: 18px;
    margin: 4px 0 4px 36px;
    background: var(--questudy-bg);
    border-radius: var(--questudy-radius-sm);
    border: 1px solid var(--questudy-border);
    border-left: 3px solid var(--questudy-primary);
}

.qg-penalty label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--questudy-text);
    margin-bottom: 8px;
}

/* ===== Buttons ===== */
.qg-btn,
.questudy-button,
.questudy-register-form .button,
.cbt-btn-primary {
    align-items: center;
    background: var(--questudy-primary-gradient);
    border: none;
    border-radius: var(--questudy-radius-sm);
    box-shadow: 0 4px 14px rgba(99,102,241,0.3);
    color: #fff;
    cursor: pointer;
    display: inline-flex;
    font-family: inherit;
    font-weight: 700;
    justify-content: center;
    line-height: 1.2;
    text-decoration: none;
    transition: all var(--questudy-transition);
    position: relative;
    overflow: hidden;
}

.qg-btn::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}

.qg-btn {
    font-size: 16px;
    padding: 16px 32px;
    width: 100%;
}

.qg-btn::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.1) 100%);
    opacity: 0;
    transition: opacity var(--questudy-transition);
}

.qg-btn:hover,
.questudy-button:hover,
.questudy-register-form .button:hover,
.cbt-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.35);
}

.qg-btn:hover::after { opacity: 1; }

.qg-btn:active,
.questudy-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 14px rgba(99,102,241,0.3);
}

.qg-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.questudy-button-secondary,
.questudy-icon-button {
    background: var(--questudy-card-bg);
    border: 1.5px solid var(--questudy-border);
    color: var(--questudy-text);
    box-shadow: var(--questudy-shadow);
}

.questudy-button-secondary:hover,
.questudy-icon-button:hover {
    background: var(--questudy-bg);
    border-color: #cbd5e1;
    color: var(--questudy-text);
    box-shadow: var(--questudy-shadow-md);
}

.questudy-button-small {
    min-height: 36px;
    padding: 8px 16px;
    font-size: 13px;
}

.questudy-button-flag { background: transparent; color: var(--questudy-warning); border-color: var(--questudy-warning); }
.questudy-button-flag:hover { background: var(--questudy-warning-light); }

/* ===== Icons ===== */
.questudy-stat-icon {
    background: var(--questudy-primary-light);
    border-radius: 12px;
    color: var(--questudy-primary);
    display: inline-flex;
    font-size: 22px;
    height: 48px;
    justify-content: center;
    margin-bottom: 8px;
    width: 48px;
    align-items: center;
}

.questudy-action-icon { font-size: 32px; }

/* ===== Stats Cards ===== */
.questudy-dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 28px;
}

.questudy-stat-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 24px;
    text-align: left;
    box-shadow: var(--questudy-shadow);
    transition: all var(--questudy-transition);
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 160px;
    position: relative;
    overflow: hidden;
}

.questudy-stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--questudy-primary-gradient);
    opacity: 0;
    transition: opacity var(--questudy-transition);
}

.questudy-stat-card:hover::after { opacity: 1; }

.questudy-stat-value {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: var(--questudy-text);
    line-height: 1;
    letter-spacing: -1px;
}

.questudy-stat-label {
    display: block;
    font-size: 13px;
    color: var(--questudy-text-light);
    font-weight: 500;
}

/* ===== Quick Actions ===== */
.questudy-quick-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.questudy-action-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 28px 24px;
    background: var(--questudy-card-bg);
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    text-decoration: none;
    color: var(--questudy-text);
    transition: all var(--questudy-transition);
    box-shadow: var(--questudy-shadow);
    min-height: 140px;
    position: relative;
    overflow: hidden;
}

.questudy-action-card::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--questudy-primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--questudy-transition);
}

.questudy-action-card:hover::before { transform: scaleX(1); }

.questudy-action-card:hover {
    border-color: var(--questudy-primary);
    box-shadow: var(--questudy-shadow-lg);
    transform: translateY(-3px);
}

.questudy-action-text {
    font-weight: 700;
    font-size: 15px;
}

/* ===== Mini Chart ===== */
.questudy-chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 160px;
    padding: 16px 0;
}

.questudy-chart-bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.questudy-chart-bar {
    width: 100%;
    max-width: 36px;
    background: var(--questudy-primary-gradient);
    border-radius: 8px 8px 0 0;
    min-height: 4px;
    transition: height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.questudy-chart-bar::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 100%);
    border-radius: inherit;
}

.questudy-chart-label {
    font-size: 11px;
    color: var(--questudy-text-light);
    font-weight: 600;
}

/* ===== Dashboard Sections ===== */
.questudy-dashboard-section {
    margin-bottom: 32px;
}

.questudy-dashboard-section h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 16px;
    position: relative;
}

/* ===== Weak Areas ===== */
.questudy-weak-subtitle { color: var(--questudy-text-light); font-size: 14px; margin: 0 0 16px; }

.questudy-weak-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.questudy-weak-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 20px;
    box-shadow: var(--questudy-shadow);
    transition: all var(--questudy-transition);
    position: relative;
    overflow: hidden;
}

.questudy-weak-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--questudy-error) 0%, var(--questudy-warning) 100%);
}

.questudy-weak-card:hover {
    box-shadow: var(--questudy-shadow-lg);
    transform: translateY(-2px);
}

.questudy-weak-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.questudy-weak-topic { font-weight: 700; font-size: 15px; }

.questudy-weak-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    background: var(--questudy-error-light);
    color: var(--questudy-error);
}

.questudy-weak-detail { font-size: 13px; color: var(--questudy-text-light); margin: 0 0 12px; }

.questudy-weak-recommendations {
    border-top: 1px solid var(--questudy-border);
    padding-top: 12px;
}

.questudy-weak-recommendations strong {
    display: block;
    font-size: 13px;
    margin-bottom: 8px;
    color: var(--questudy-text);
}

.questudy-weak-recommendations ul { margin: 0; padding-left: 16px; }
.questudy-weak-recommendations li { font-size: 13px; color: var(--questudy-text-light); line-height: 1.7; margin-bottom: 4px; }
.questudy-weak-recommendations li:last-child { margin-top: 8px; list-style: none; margin-left: -16px; }
.questudy-weak-recommendations li:last-child a { color: var(--questudy-primary); font-weight: 600; text-decoration: none; }
.questudy-weak-recommendations li:last-child a:hover { text-decoration: underline; }

/* ===== Score Card ===== */
.questudy-score-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 32px;
    box-shadow: var(--questudy-shadow-md);
    margin-bottom: 28px;
    display: flex;
    gap: 32px;
    align-items: center;
}

.questudy-score-circle {
    text-align: center;
    position: relative;
    background: var(--questudy-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    min-width: 220px;
    padding: 28px;
}

.questudy-score-percentage {
    display: block;
    font-size: 56px;
    font-weight: 900;
    color: var(--questudy-primary);
    line-height: 1;
    letter-spacing: -2px;
}

.questudy-score-grade {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--questudy-text-light);
    margin-top: 8px;
}

.questudy-score-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    flex: 1;
}

.questudy-score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--questudy-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
}

.questudy-score-label { color: var(--questudy-text-light); font-size: 14px; }
.questudy-score-value { font-weight: 700; font-size: 16px; }
.questudy-score-correct { color: var(--questudy-success); }
.questudy-score-incorrect { color: var(--questudy-error); }

/* ===== Topic Bars ===== */
.questudy-topic-bars { display: flex; flex-direction: column; gap: 16px; }

.questudy-topic-bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: 8px;
}

.questudy-topic-bar-label span:first-child { font-weight: 600; }
.questudy-topic-bar-label span:last-child { color: var(--questudy-text-light); font-size: 13px; }

.questudy-topic-bar-track {
    height: 12px;
    background: var(--questudy-bg);
    border-radius: 100px;
    overflow: hidden;
    border: 1px solid var(--questudy-border);
}

.questudy-topic-bar-fill {
    height: 100%;
    background: var(--questudy-primary-gradient);
    border-radius: 100px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.questudy-topic-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.25) 0%, transparent 100%);
    border-radius: inherit;
}

/* ===== Tables ===== */
.questudy-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    overflow: hidden;
    box-shadow: var(--questudy-shadow);
}

.questudy-table th,
.questudy-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--questudy-border);
}

.questudy-table th {
    font-weight: 700;
    background: var(--questudy-bg);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--questudy-text-light);
}

.questudy-table tr:last-child td { border-bottom: none; }
.questudy-table tr:hover td { background: rgba(99,102,241,0.02); }

/* ===== Past Questions ===== */
.questudy-pq-filter-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.questudy-pq-mode-selector {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    background: var(--questudy-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
    padding: 8px;
}

.questudy-pq-mode-label {
    color: var(--questudy-text-light);
    font-size: 13px;
    font-weight: 700;
    padding: 0 8px;
}

.questudy-pq-mode-btn {
    padding: 8px 16px;
    border: 1.5px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    background: var(--questudy-card-bg);
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    transition: all var(--questudy-transition);
}

.questudy-pq-mode-btn:hover { border-color: var(--questudy-primary); }

.questudy-pq-mode-btn.active {
    background: var(--questudy-primary);
    color: #fff;
    border-color: var(--questudy-primary);
    box-shadow: 0 4px 12px rgba(99,102,241,0.25);
}

.questudy-papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.questudy-paper-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 24px;
    box-shadow: var(--questudy-shadow);
    transition: all var(--questudy-transition);
    display: flex;
    flex-direction: column;
    min-height: 220px;
}

.questudy-paper-card:hover {
    box-shadow: var(--questudy-shadow-lg);
    transform: translateY(-3px);
}

.questudy-paper-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.questudy-paper-exam-body {
    font-size: 11px;
    font-weight: 700;
    color: var(--questudy-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--questudy-primary-light);
    padding: 4px 10px;
    border-radius: 100px;
}

.questudy-paper-year {
    font-size: 12px;
    color: var(--questudy-text-light);
    background: var(--questudy-bg);
    padding: 4px 10px;
    border-radius: 100px;
    font-weight: 600;
}

.questudy-paper-title {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 8px;
    color: var(--questudy-text);
    line-height: 1.3;
}

.questudy-paper-meta {
    font-size: 13px;
    color: var(--questudy-text-light);
    margin-top: auto;
}

/* ===== Notices ===== */
.questudy-notice {
    padding: 14px 20px;
    border-radius: var(--questudy-radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.6;
    border: 1px solid transparent;
    border-left-width: 4px;
}

.questudy-notice-error { background: var(--questudy-error-light); color: #991b1b; border-left-color: var(--questudy-error); }
.questudy-notice-warning { background: var(--questudy-warning-light); color: #92400e; border-left-color: var(--questudy-warning); }
.questudy-notice-info { background: #eff6ff; color: #1e40af; border-left-color: #3b82f6; }
.questudy-notice-success { background: var(--questudy-success-light); color: #166534; border-left-color: var(--questudy-success); }

/* ===== Empty State ===== */
.questudy-empty-state {
    background: var(--questudy-card-bg);
    border: 2px dashed var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 64px 24px;
    text-align: center;
    color: var(--questudy-text-light);
}

.questudy-empty-state p { font-size: 16px; }

/* ===== Badges ===== */
.questudy-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 700;
}

.questudy-badge-success { background: var(--questudy-success-light); color: #166534; }
.questudy-badge-error { background: var(--questudy-error-light); color: #991b1b; }
.questudy-badge-warning { background: var(--questudy-warning-light); color: #92400e; }

/* ===== Buttons Row ===== */
.questudy-results-topbar {
    align-items: flex-start;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    margin-bottom: 18px;
}

.questudy-icon-button {
    align-items: center;
    border-radius: 100px;
    display: inline-flex;
    font-size: 13px;
    gap: 6px;
    justify-content: center;
    min-height: 38px;
    padding: 8px 16px;
}

.questudy-results-date { color: var(--questudy-text-light); font-size: 14px; margin: 0; }

/* ===== Review ===== */
.questudy-review-card {
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--questudy-shadow);
    transition: all var(--questudy-transition);
    position: relative;
    overflow: hidden;
}

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

.questudy-review-correct { border-left: 4px solid var(--questudy-success); }
.questudy-review-incorrect { border-left: 4px solid var(--questudy-error); }

.questudy-review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.questudy-review-number { font-weight: 700; font-size: 16px; color: var(--questudy-primary); }

.questudy-review-status {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 100px;
}

.questudy-review-correct .questudy-review-status { background: var(--questudy-success-light); color: #166534; }
.questudy-review-incorrect .questudy-review-status { background: var(--questudy-error-light); color: #991b1b; }

.questudy-review-marks { color: var(--questudy-text-light); font-size: 13px; margin-left: auto; }

.questudy-review-options { display: flex; flex-direction: column; gap: 8px; margin: 12px 0; }

.questudy-review-option {
    padding: 12px 16px;
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
    font-size: 14px;
}

.questudy-option-correct { background: var(--questudy-success-light); border-color: var(--questudy-success); color: #166534; font-weight: 600; }
.questudy-option-wrong { background: var(--questudy-error-light); border-color: var(--questudy-error); color: #991b1b; font-weight: 600; }

.questudy-review-content { font-size: 16px; line-height: 1.7; }
.questudy-review-answer { font-size: 14px; margin: 8px 0; }

.questudy-review-explanation {
    margin-top: 12px;
    padding: 16px;
    background: var(--questudy-bg);
    border-radius: var(--questudy-radius-sm);
    font-size: 14px;
    line-height: 1.7;
    border-left: 3px solid var(--questudy-primary);
}

/* ===== Modal ===== */
.questudy-modal {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    z-index: 1000;
    background: rgba(15,23,42,0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: questudy-fade-in 0.2s;
    padding: 20px;
}

.questudy-modal-content {
    background: var(--questudy-card-bg);
    padding: 36px;
    border-radius: var(--questudy-radius);
    max-width: 480px;
    width: 100%;
    box-shadow: var(--questudy-shadow-xl);
    animation: questudy-slide-up 0.25s;
}

.questudy-modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 28px;
}

@keyframes questudy-fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes questudy-slide-up { from { opacity: 0; transform: translateY(20px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }

/* ===== Spinner ===== */
.questudy-spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.25);
    border-top-color: #fff;
    border-radius: 50%;
    animation: questudy-spin 0.6s linear infinite;
    display: inline-block;
}

.questudy-spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

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

/* ===== Loading Overlay ===== */
.questudy-loading-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    inset: 0;
    z-index: 9999;
    background: rgba(15,23,42,0.5);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.questudy-loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
}

/* ===== Loader ===== */
.qg-loader {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 48px 28px;
    background: var(--questudy-card-bg);
    border: 1px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    box-shadow: var(--questudy-shadow);
}

.qg-loader-bar {
    height: 16px;
    background: linear-gradient(90deg, #e2e8f0 25%, #f8fafc 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: qg-shimmer 1.5s infinite;
    border-radius: 100px;
}

.qg-loader-bar:nth-child(1) { width: 92%; }
.qg-loader-bar:nth-child(2) { width: 76%; }
.qg-loader-bar:nth-child(3) { width: 52%; }

@keyframes qg-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.qg-loader-text {
    text-align: center;
    margin: 16px 0 0;
    color: var(--questudy-text-light);
    font-size: 15px;
    font-weight: 500;
}

/* ===== Auth ===== */
.questudy-auth-header {
    margin-bottom: 0;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.questudy-register-form {
    border-top: 0;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}

.questudy-register-form p { margin: 0 0 16px; }
.questudy-register-form label { font-weight: 600; font-size: 14px; color: var(--questudy-text); }

.questudy-register-form .regular-text {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
    font-size: 14px;
    font-family: inherit;
    margin-top: 6px;
    transition: all var(--questudy-transition);
}

.questudy-register-form .regular-text:focus {
    outline: none;
    border-color: var(--questudy-primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}

.questudy-register-form p:last-child { margin-bottom: 0; }

.questudy-register-form .button {
    width: 100%;
    padding: 14px 18px;
}

.questudy-auth-link {
    color: var(--questudy-text-light);
    font-size: 14px;
    margin: 16px 0 0;
    text-align: center;
}

.questudy-auth-link a { color: var(--questudy-primary); font-weight: 700; text-decoration: none; }
.questudy-auth-link a:hover { text-decoration: underline; }

/* ===== CBT Interface ===== */
:root {
    --cbt-primary: #1e293b;
    --cbt-primary-light: #6366f1;
    --cbt-accent: #8b5cf6;
    --cbt-success: #10b981;
    --cbt-warning: #f59e0b;
    --cbt-danger: #ef4444;
    --cbt-bg: #f1f5f9;
    --cbt-card: #ffffff;
    --cbt-text: #0f172a;
    --cbt-text-light: #64748b;
    --cbt-border: #e2e8f0;
    --cbt-shadow: 0 1px 3px rgba(0,0,0,0.05);
    --cbt-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 10px 15px -3px rgba(0,0,0,0.08);
    --cbt-radius: 14px;
    --cbt-radius-sm: 8px;
    --cbt-header-h: 64px;
    --cbt-sidebar-w: 260px;
    --cbt-sidebar-right-w: 270px;
}

.questudy-cbt-interface * { box-sizing: border-box; }
.questudy-cbt-interface {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--cbt-text);
    background: var(--cbt-bg);
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    margin: -20px -20px 0;
    position: relative;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.cbt-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: #fff;
    padding: 0 28px;
    height: var(--cbt-header-h);
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(15,23,42,0.2);
    position: sticky;
    top: 0;
    z-index: 100;
}

.cbt-header-left .cbt-logo {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.3px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.cbt-header-center .cbt-timer {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    background: rgba(255,255,255,0.1);
    padding: 8px 24px;
    border-radius: 100px;
    letter-spacing: 1px;
    border: 1px solid rgba(255,255,255,0.1);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.cbt-header-center .cbt-timer .cbt-timer-icon { font-size: 18px; opacity: 0.9; }

.cbt-header-right { display: flex; align-items: center; gap: 10px; }

.cbt-tool-btn {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--cbt-radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cbt-tool-btn:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.2); }

.cbt-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 18px;
    background: rgba(255,255,255,0.1);
    border-radius: 100px;
    font-size: 14px;
    border: 1px solid rgba(255,255,255,0.1);
}

.cbt-profile-avatar { font-size: 18px; line-height: 1; }

.cbt-body {
    display: flex;
    flex: 1;
    min-height: 0;
    gap: 20px;
    padding: 20px 24px;
    align-items: flex-start;
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
}

.cbt-sidebar-left {
    width: var(--cbt-sidebar-w);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: sticky;
    top: calc(var(--cbt-header-h) + 20px);
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    border-radius: var(--cbt-radius);
    padding: 20px 18px;
    color: #fff;
    box-shadow: 0 8px 30px rgba(15,23,42,0.25);
}

.cbt-sidebar-left .cbt-test-info h3,
.cbt-sidebar-left .cbt-instructions h4 {
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin: 0 0 14px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding-bottom: 10px;
    opacity: 0.8;
}

.cbt-sidebar-left .cbt-info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 13px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.cbt-sidebar-left .cbt-info-row:last-child { border-bottom: none; }
.cbt-sidebar-left .cbt-info-label { color: rgba(255,255,255,0.5); font-size: 12px; }
.cbt-sidebar-left .cbt-info-value { font-weight: 600; color: #fff; font-size: 13px; }

.cbt-sidebar-left .cbt-instructions ul {
    margin: 0;
    padding: 0 0 0 18px;
    font-size: 12px;
    line-height: 2;
    color: rgba(255,255,255,0.6);
}

.cbt-sidebar-left .cbt-instructions ul li::marker { color: rgba(255,255,255,0.3); }

.cbt-sidebar-left .cbt-submit-btn {
    margin-top: auto;
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: #fff;
    border: none;
    border-radius: var(--cbt-radius-sm);
    font-size: 14px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 14px rgba(239,68,68,0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cbt-sidebar-left .cbt-submit-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(239,68,68,0.4); }

.cbt-sidebar-right {
    width: var(--cbt-sidebar-right-w);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: sticky;
    top: calc(var(--cbt-header-h) + 20px);
}

.cbt-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 16px; }

.cbt-card {
    background: var(--cbt-card);
    border-radius: var(--cbt-radius);
    box-shadow: var(--cbt-shadow-md);
    padding: 18px;
    border: 1px solid var(--cbt-border);
}

.cbt-card h4 {
    margin: 0 0 14px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--cbt-primary-light);
    border-bottom: 2px solid var(--cbt-bg);
    padding-bottom: 10px;
}

.cbt-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--cbt-card);
    border-radius: var(--cbt-radius);
    box-shadow: var(--cbt-shadow);
    padding: 14px 22px;
    border: 1px solid var(--cbt-border);
}

#cbt-section-name { font-weight: 700; font-size: 15px; color: var(--cbt-primary-light); }
#cbt-question-progress { color: var(--cbt-text-light); font-size: 14px; }

.cbt-question-card {
    background: var(--cbt-card);
    border-radius: var(--cbt-radius);
    box-shadow: var(--cbt-shadow-md);
    padding: 28px 30px;
    flex: 1;
    min-height: 320px;
    border: 1px solid var(--cbt-border);
}

.cbt-question-text { font-size: 17px; line-height: 1.8; margin-bottom: 28px; color: var(--cbt-text); }

.cbt-options { display: flex; flex-direction: column; gap: 12px; }

.cbt-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border: 2px solid var(--cbt-border);
    border-radius: var(--cbt-radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 15px;
    background: #fff;
}

.cbt-option:hover { border-color: var(--cbt-accent); background: #f8f7ff; transform: translateX(3px); }

.cbt-option.selected {
    border-color: var(--cbt-primary-light);
    background: linear-gradient(135deg, #eef2ff 0%, #f5f3ff 100%);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.cbt-option input[type="radio"] { display: none; }

.cbt-option .cbt-option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--cbt-bg);
    font-weight: 700;
    font-size: 14px;
    color: var(--cbt-text-light);
    flex-shrink: 0;
    transition: all 0.2s;
}

.cbt-option.selected .cbt-option-letter {
    background: var(--cbt-primary-light);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.cbt-option .cbt-option-text { flex: 1; }

.cbt-question-actions { display: flex; align-items: center; gap: 20px; padding: 4px 0; }

.cbt-review-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--cbt-text-light);
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    padding: 6px 12px;
    border-radius: 8px;
    transition: background 0.2s;
}

.cbt-review-label:hover { background: var(--cbt-bg); }
.cbt-review-label input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--cbt-warning); }
.cbt-bookmark-icon { font-size: 16px; opacity: 0.5; transition: opacity 0.2s; }
.cbt-review-label:hover .cbt-bookmark-icon { opacity: 1; }
.cbt-review-label input[type="checkbox"]:checked ~ .cbt-bookmark-icon { opacity: 1; }

.cbt-clear-btn {
    background: none;
    border: 1.5px solid var(--cbt-border);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-family: inherit;
    color: var(--cbt-text-light);
    transition: all 0.2s;
}

.cbt-clear-btn:hover { border-color: var(--cbt-danger); color: var(--cbt-danger); background: #fef2f2; }

.cbt-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    background: var(--cbt-card);
    border-radius: var(--cbt-radius);
    box-shadow: var(--cbt-shadow);
    padding: 14px 20px;
    border: 1px solid var(--cbt-border);
}

.cbt-nav-btn {
    padding: 10px 24px;
    border: 2px solid var(--cbt-primary-light);
    background: transparent;
    color: var(--cbt-primary-light);
    border-radius: var(--cbt-radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.2s;
}

.cbt-nav-btn:hover { background: var(--cbt-primary-light); color: #fff; }
.cbt-nav-btn:disabled { opacity: 0.35; cursor: not-allowed; border-color: var(--cbt-border); color: var(--cbt-text-light); }
.cbt-nav-btn:disabled:hover { background: transparent; color: var(--cbt-text-light); }

.cbt-nav-next { background: var(--cbt-primary-light); color: #fff; }
.cbt-nav-next:hover { background: var(--cbt-primary); border-color: var(--cbt-primary); }

.cbt-jump-wrap select {
    padding: 9px 16px;
    border: 1.5px solid var(--cbt-border);
    border-radius: var(--cbt-radius-sm);
    font-size: 13px;
    font-family: inherit;
    background: #fff;
    min-width: 170px;
    color: var(--cbt-text);
    cursor: pointer;
}

.cbt-jump-wrap select:focus { border-color: var(--cbt-accent); outline: none; box-shadow: 0 0 0 3px rgba(139,92,246,0.1); }

.cbt-palette-legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 14px; font-size: 12px; color: var(--cbt-text-light); }

.cbt-legend-dot {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 4px;
    vertical-align: middle;
    margin-right: 5px;
    border: 1px solid rgba(0,0,0,0.05);
}

.cbt-legend-dot.answered { background: var(--cbt-success); }
.cbt-legend-dot.current { background: var(--cbt-primary-light); }
.cbt-legend-dot.unanswered { background: #e2e8f0; }
.cbt-legend-dot.review { background: var(--cbt-warning); }

.cbt-palette { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }

.cbt-palette-btn {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--cbt-text-light);
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cbt-palette-btn:hover { border-color: var(--cbt-accent); background: #f5f3ff; transform: scale(1.05); }
.cbt-palette-btn.answered { background: var(--cbt-success); border-color: var(--cbt-success); color: #fff; }
.cbt-palette-btn.current { background: var(--cbt-primary-light); border-color: var(--cbt-primary-light); color: #fff; box-shadow: 0 0 0 3px rgba(99,102,241,0.2); }
.cbt-palette-btn.review { background: var(--cbt-warning); border-color: var(--cbt-warning); color: #fff; }
.cbt-palette-btn.answered.review { background: linear-gradient(135deg, var(--cbt-success) 50%, var(--cbt-warning) 50%); border-color: var(--cbt-success); color: #fff; }

.cbt-section-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.cbt-section-table th { text-align: left; padding: 8px 4px 8px 0; font-weight: 700; color: var(--cbt-text-light); border-bottom: 2px solid var(--cbt-bg); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.cbt-section-table td { padding: 8px 4px 8px 0; border-bottom: 1px solid #f0f2f5; }
.cbt-section-table tbody tr:last-child td { border-bottom: none; }
.cbt-section-progress-text { font-weight: 600; color: var(--cbt-primary-light); text-align: right; }

.cbt-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cbt-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15,23,42,0.6);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.cbt-modal-content {
    position: relative;
    background: #fff;
    border-radius: var(--cbt-radius);
    box-shadow: 0 24px 64px rgba(0,0,0,0.2);
    padding: 36px 32px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    animation: cbt-modal-in 0.25s ease-out;
}

@keyframes cbt-modal-in { from { transform: scale(0.95) translateY(10px); opacity: 0; } to { transform: scale(1) translateY(0); opacity: 1; } }

.cbt-modal-content h3 { margin: 0 0 10px; font-size: 22px; color: var(--cbt-text); }
.cbt-modal-content p { color: var(--cbt-text-light); margin: 0 0 28px; font-size: 15px; line-height: 1.6; }
.cbt-modal-actions { display: flex; gap: 12px; justify-content: center; }

.cbt-btn {
    padding: 12px 32px;
    border-radius: var(--cbt-radius-sm);
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.2s;
}

.cbt-btn-primary { background: var(--cbt-primary-light); color: #fff; box-shadow: 0 4px 12px rgba(99,102,241,0.25); }
.cbt-btn-primary:hover { background: var(--cbt-primary); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,0.3); }
.cbt-btn-secondary { background: var(--cbt-bg); color: var(--cbt-text); }
.cbt-btn-secondary:hover { background: #e2e8f0; }

.cbt-skeleton { padding: 20px 0; }
.cbt-skeleton-item { height: 16px; background: linear-gradient(90deg, #e8edf2 25%, #f0f4f8 50%, #e8edf2 75%); background-size: 200% 100%; animation: cbt-shimmer 1.5s infinite; border-radius: 8px; margin-bottom: 12px; }
.cbt-skeleton-item:nth-child(2) { width: 85%; }
.cbt-skeleton-item:nth-child(3) { width: 70%; }
@keyframes cbt-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ===== JAMB Subject Picker ===== */
.questudy-jamb-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 8px;
    margin-top: 8px;
}

.questudy-jamb-item {
    background: var(--questudy-card-bg);
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius-sm);
    padding: 10px 14px;
    transition: all var(--questudy-transition);
}

.questudy-jamb-item:hover { border-color: var(--questudy-primary); }

.questudy-jamb-item label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--questudy-text);
}

.questudy-jamb-item input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--questudy-primary); }

.questudy-jamb-item.compulsory {
    background: var(--questudy-primary-light);
    border-color: var(--questudy-primary);
}

.questudy-jamb-item.compulsory em { font-size: 12px; color: var(--questudy-text-light); }

/* ===== Competition Arena ===== */
.qc-arena { max-width: 1200px; margin: 0 auto; padding: 32px 20px; }

.qc-arena-header {
    position: relative;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1e293b 100%);
    border: none;
    border-radius: 20px;
    padding: 36px 40px;
    margin-bottom: 32px;
    overflow: hidden;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}
.qc-arena-header-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background:
        radial-gradient(circle at 10% 50%, rgba(99,102,241,0.15) 0%, transparent 50%),
        radial-gradient(circle at 90% 20%, rgba(239,68,68,0.1) 0%, transparent 40%);
    pointer-events: none;
}
.qc-arena-header-content { position: relative; z-index: 1; display: flex; justify-content: space-between; align-items: center; width: 100%; }
.qc-arena-header-left { display: flex; align-items: center; gap: 18px; }
.qc-arena-logo { font-size: 44px; line-height: 1; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3)); }
.qc-arena-header h1 { margin: 0 0 6px; font-size: 28px; font-weight: 800; letter-spacing: -0.5px; }
.qc-arena-header p { margin: 0; font-size: 14px; color: rgba(255,255,255,0.6); max-width: 420px; }

.qc-arena-stats { display: flex; gap: 16px; flex-shrink: 0; }
.qc-arena-stat {
    text-align: center;
    padding: 12px 20px;
    background: rgba(255,255,255,0.06);
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.08);
    min-width: 80px;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}
.qc-arena-stat-num { display: block; font-size: 28px; font-weight: 800; color: #fff; line-height: 1.2; }
.qc-arena-stat-live .qc-arena-stat-num { color: #60a5fa; }
.qc-arena-stat-won .qc-arena-stat-num { color: #34d399; }
.qc-arena-stat-lbl { display: block; font-size: 11px; color: rgba(255,255,255,0.45); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-top: 2px; }

/* Sections */
.qc-arena-section { background: var(--questudy-card-bg); border: 1px solid var(--questudy-border); border-radius: var(--questudy-radius); padding: 28px; box-shadow: var(--questudy-shadow); margin-bottom: 24px; }
.qc-arena-section-head { margin-bottom: 22px; }
.qc-arena-section-head h2 { margin: 0; font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 10px; color: var(--questudy-text); }
.qc-sec-icon { font-size: 20px; }

/* Challenge Badge */
.qc-challenge-badge {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 24px; height: 24px; padding: 0 8px;
    border-radius: 100px; font-size: 12px; font-weight: 700;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff; box-shadow: 0 2px 8px rgba(239,68,68,0.3);
    animation: qc-badge-pulse 2s infinite;
}
@keyframes qc-badge-pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.1); } }

.qc-arena-challenges { border-color: #fde68a; border-left: 4px solid #f59e0b; }

/* Challenge Grid */
.qc-challenge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.qc-challenge-card {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border: 1.5px solid #fde68a;
    border-radius: 14px;
    padding: 20px;
    transition: all 0.25s;
}
.qc-challenge-card:hover { border-color: #f59e0b; box-shadow: 0 8px 24px rgba(245,158,11,0.15); transform: translateY(-2px); }
.qc-chc-top { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.qc-chc-avatar {
    width: 44px; height: 44px; border-radius: 12px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.qc-chc-info { flex: 1; }
.qc-chc-info strong { display: block; font-size: 15px; color: #92400e; }
.qc-chc-info span { font-size: 13px; color: #a16207; }
.qc-chc-details { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.qc-chc-tag { font-size: 12px; font-weight: 600; color: #92400e; padding: 4px 10px; background: rgba(255,255,255,0.7); border-radius: 100px; }
.qc-chc-actions { display: flex; gap: 8px; }

/* Competition Grid */
.qc-comp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; }

.qc-cgc {
    background: var(--questudy-card-bg);
    border: 1.5px solid var(--questudy-border);
    border-top: 3px solid var(--card-accent, #e2e8f0);
    border-radius: 16px;
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all 0.25s;
}
.qc-cgc:hover { transform: translateY(-3px); box-shadow: var(--questudy-shadow-lg); border-color: var(--card-accent, #c7d2fe); }

.qc-cgc-top { display: flex; align-items: center; justify-content: space-between; }
.qc-cgc-status {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 12px; border-radius: 100px;
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.3px;
}
.qc-cgc-won { font-size: 20px; }

/* Battle Display */
.qc-cgc-battle { display: flex; align-items: center; justify-content: center; gap: 16px; padding: 16px 0; }
.qc-cgc-player { display: flex; flex-direction: column; align-items: center; gap: 6px; flex: 1; min-width: 0; }
.qc-cgc-avatar {
    width: 48px; height: 48px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 18px; color: #fff; flex-shrink: 0;
}
.qc-cgc-avatar-me { background: linear-gradient(135deg, #6366f1, #8b5cf6); box-shadow: 0 4px 12px rgba(99,102,241,0.3); }
.qc-cgc-avatar-opp { background: linear-gradient(135deg, #64748b, #475569); box-shadow: 0 4px 12px rgba(100,116,139,0.3); }
.qc-cgc-pname { font-size: 13px; font-weight: 600; color: var(--questudy-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; text-align: center; }
.qc-cgc-pct { font-size: 18px; font-weight: 800; }
.qc-cgc-vs {
    font-size: 12px; font-weight: 800; letter-spacing: 1px;
    color: var(--questudy-text-light); padding: 6px 10px;
    background: var(--questudy-bg); border-radius: 8px;
}

/* Meta */
.qc-cgc-meta { display: flex; justify-content: center; gap: 14px; font-size: 12px; color: var(--questudy-text-light); font-weight: 500; }

/* Actions */
.qc-cgc-actions { display: flex; justify-content: center; gap: 8px; }
.qc-cgc-waiting { font-size: 13px; color: var(--questudy-text-light); font-style: italic; padding: 8px 16px; background: var(--questudy-bg); border-radius: var(--questudy-radius-sm); }
.qc-cgc-accepted { font-size: 13px; color: var(--questudy-success); font-weight: 600; padding: 8px 16px; background: var(--questudy-success-light); border-radius: var(--questudy-radius-sm); }
.qc-cgc-cancelled { font-size: 13px; color: var(--questudy-text-light); font-style: italic; }

/* Challenge Button (Online Users) */
.qc-btn-challenge {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
    border: none;
    font-size: 12px;
    padding: 7px 16px;
    box-shadow: 0 4px 12px rgba(239,68,68,0.25);
    border-radius: 10px;
    white-space: nowrap;
    flex-shrink: 0;
}
.qc-btn-challenge:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(239,68,68,0.3); color: #fff; }

/* Spinner */
.qc-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: qc-spin 0.6s linear infinite;
    vertical-align: middle;
}
@keyframes qc-spin { to { transform: rotate(360deg); } }

/* Online Empty State */
.qc-online-empty { text-align: center; padding: 24px 16px; }

/* Results List (dynamically generated) */
.qc-results-list { display: flex; flex-direction: column; gap: 10px; }
.qc-result-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    border: 1.5px solid var(--questudy-border);
    border-radius: var(--questudy-radius);
    transition: all 0.25s;
}
.qc-result-winner { background: linear-gradient(135deg, #fffbeb, #fef3c7); border-color: #fbbf24; box-shadow: 0 4px 16px rgba(251,191,36,0.15); }
.qc-result-me { box-shadow: inset 0 0 0 2px var(--questudy-primary); }
.qc-result-rank { font-weight: 800; font-size: 18px; min-width: 56px; color: var(--questudy-text); }
.qc-result-name { flex: 1; font-weight: 600; font-size: 15px; }
.qc-result-score { font-size: 20px; font-weight: 800; color: var(--questudy-primary); }
.qc-result-correct { font-size: 13px; color: var(--questudy-text-light); }

/* Buttons */
.qc-btn {
    padding: 10px 18px; border-radius: 10px; border: 1.5px solid var(--questudy-border);
    background: var(--questudy-card-bg); color: var(--questudy-text);
    font-size: 13px; font-weight: 600; font-family: inherit; cursor: pointer;
    transition: all 0.25s; white-space: nowrap;
    display: inline-flex; align-items: center; gap: 5px; line-height: 1.3;
}
.qc-btn:hover { background: var(--questudy-bg); box-shadow: var(--questudy-shadow); }
.qc-btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
.qc-btn-primary { background: var(--questudy-primary-gradient); color: #fff; border: none; box-shadow: 0 4px 16px rgba(99,102,241,0.25); }
.qc-btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(99,102,241,0.35); color: #fff; background: var(--questudy-primary-gradient); }
.qc-btn-accept { background: linear-gradient(135deg, #10b981, #059669); color: #fff; border: none; box-shadow: 0 4px 12px rgba(16,185,129,0.25); }
.qc-btn-accept:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(16,185,129,0.3); color: #fff; }
.qc-btn-decline { background: #fef2f2; color: #dc2626; border-color: #fecaca; }
.qc-btn-decline:hover { background: #fee2e2; border-color: #fca5a5; }
.qc-btn-start { background: var(--questudy-primary-gradient); color: #fff; border: none; box-shadow: 0 4px 12px rgba(99,102,241,0.25); }
.qc-btn-start:hover { transform: translateY(-1px); color: #fff; }
.qc-btn-cancel-sm { background: #fef2f2; color: #dc2626; border-color: #fecaca; font-size: 15px; padding: 10px 12px; }
.qc-btn-cancel-sm:hover { background: #fee2e2; }
.qc-btn-join { background: linear-gradient(135deg, #f59e0b, #d97706); color: #fff; border: none; box-shadow: 0 4px 12px rgba(245,158,11,0.25); }
.qc-btn-join:hover { transform: translateY(-1px); color: #fff; }
.qc-btn-results { background: linear-gradient(135deg, #8b5cf6, #7c3aed); color: #fff; border: none; box-shadow: 0 4px 12px rgba(139,92,246,0.25); }
.qc-btn-results:hover { transform: translateY(-1px); color: #fff; }

/* Online Users */
.qc-online-dot { width: 10px; height: 10px; background: var(--questudy-success); border-radius: 50%; display: inline-block; animation: qc-pulse 2s infinite; box-shadow: 0 0 8px rgba(16,185,129,0.4); flex-shrink: 0; }
@keyframes qc-pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.9); } }
.qc-online-count { font-weight: 400; color: var(--questudy-text-light); font-size: 14px; }
.qc-online-list { display: flex; flex-direction: column; gap: 4px; max-height: 400px; overflow-y: auto; }
.qc-online-user { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--questudy-radius-sm); transition: all 0.25s; border: 1px solid transparent; }
.qc-online-user:hover { background: var(--questudy-bg); border-color: var(--questudy-border); }
.qc-online-you { background: linear-gradient(135deg, #eef2ff, #f5f3ff); border: 1.5px solid #c7d2fe !important; margin-bottom: 8px; }
.qc-online-avatar { width: 36px; height: 36px; border-radius: 10px; background: var(--questudy-primary-gradient); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; flex-shrink: 0; }
.qc-online-avatar-you { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.qc-online-info { flex: 1; min-width: 0; }
.qc-online-name { display: block; font-weight: 600; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.qc-online-status { display: block; font-size: 11px; color: var(--questudy-text-light); }
.qc-you-tag { display: inline-flex; padding: 1px 7px; border-radius: 100px; font-size: 10px; font-weight: 700; background: var(--questudy-primary); color: #fff; vertical-align: middle; margin-left: 2px; }
.qc-online-dot-sm { width: 8px; height: 8px; background: var(--questudy-success); border-radius: 50%; flex-shrink: 0; box-shadow: 0 0 6px rgba(16,185,129,0.3); }

/* Empty State */
.qc-empty-grid { padding: 12px 0; }
.qc-empty-box { text-align: center; padding: 56px 24px; background: var(--questudy-bg); border-radius: var(--questudy-radius); border: 2px dashed var(--questudy-border); }
.qc-empty-icon { font-size: 52px; margin-bottom: 14px; opacity: 0.4; }
.qc-empty-box h3 { margin: 0 0 8px; font-size: 18px; font-weight: 700; color: var(--questudy-text); }
.qc-empty-box p { font-size: 14px; color: var(--questudy-text-light); margin: 0; max-width: 380px; margin: 0 auto; line-height: 1.6; }

/* Modal */
.qc-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 10000; justify-content: center; align-items: center; padding: 20px; }
.qc-modal-overlay { position: absolute; inset: 0; background: rgba(15,23,42,0.6); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.qc-modal-box { position: relative; background: var(--questudy-card-bg); border-radius: var(--questudy-radius); width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto; box-shadow: var(--questudy-shadow-xl); animation: qcSlideIn 0.25s ease-out; }
.qc-modal-box-lg { max-width: 620px; }
@keyframes qcSlideIn { from { opacity:0; transform: translateY(16px) scale(0.98); } to { opacity:1; transform: translateY(0) scale(1); } }
.qc-modal-head { display: flex; justify-content: space-between; align-items: center; padding: 20px 24px; border-bottom: 1px solid var(--questudy-border); }
.qc-modal-head h3 { margin: 0; font-size: 18px; font-weight: 700; }
.qc-modal-x { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--questudy-text-light); padding: 4px 8px; line-height: 1; border-radius: 8px; transition: all 0.2s; }
.qc-modal-x:hover { color: var(--questudy-text); background: var(--questudy-bg); }
.qc-modal-body { padding: 24px; }
.qc-modal-foot { padding: 16px 24px; border-top: 1px solid var(--questudy-border); display: flex; gap: 10px; justify-content: flex-end; }

.qc-modal-target { display: flex; align-items: center; gap: 14px; padding: 16px; background: var(--questudy-bg); border-radius: var(--questudy-radius-sm); margin-bottom: 20px; border: 1px solid var(--questudy-border); }
.qc-modal-target-avatar { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, #ef4444, #dc2626); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; flex-shrink: 0; }
.qc-modal-target p { margin: 0; font-size: 15px; }

/* Form Fields */
.qc-field { margin-bottom: 18px; }
.qc-field label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 14px; }
.qc-select { width: 100%; padding: 10px 14px; border: 1.5px solid var(--questudy-border); border-radius: var(--questudy-radius-sm); font-size: 14px; font-family: inherit; min-height: 44px; }
.qc-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.qc-subjects-grid { display: flex; flex-wrap: wrap; gap: 6px; max-height: 160px; overflow-y: auto; padding: 10px; border: 1.5px solid var(--questudy-border); border-radius: var(--questudy-radius-sm); background: var(--questudy-bg); }
.qc-chk { display: flex; align-items: center; gap: 6px; font-size: 13px; padding: 6px 10px; border-radius: 6px; cursor: pointer; transition: background 0.15s; }
.qc-chk:hover { background: var(--questudy-card-bg); }
.qc-chk input { width: 15px; height: 15px; accent-color: var(--questudy-primary); }

/* Results */
.qc-comp-results-list { display: flex; flex-direction: column; gap: 10px; }
.qc-comp-result-item { display: flex; align-items: center; gap: 14px; padding: 16px; border: 1.5px solid var(--questudy-border); border-radius: var(--questudy-radius); transition: all 0.25s; }
.qc-comp-result-winner { background: linear-gradient(135deg, #fffbeb, #fef3c7); border-color: #fbbf24; box-shadow: 0 4px 16px rgba(251,191,36,0.15); }
.qc-comp-result-me { box-shadow: inset 0 0 0 2px var(--questudy-primary); }
.qc-comp-result-rank { font-weight: 800; font-size: 18px; min-width: 56px; color: var(--questudy-text); }
.qc-comp-result-name { flex: 1; font-weight: 600; font-size: 15px; }
.qc-comp-result-score { font-size: 20px; font-weight: 800; color: var(--questudy-primary); }
.qc-comp-result-correct { font-size: 13px; color: var(--questudy-text-light); }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .cbt-sidebar-left { width: 220px; }
    .cbt-sidebar-right { width: 220px; }
    .cbt-body { padding: 16px 18px; gap: 14px; }
}

@media (max-width: 992px) {
    .cbt-body { flex-direction: column; padding: 14px; gap: 14px; }
    .cbt-sidebar-left, .cbt-sidebar-right { width: 100%; position: static; flex-direction: row; flex-wrap: wrap; }
    .cbt-sidebar-left .cbt-test-info, .cbt-sidebar-left .cbt-instructions { flex: 1; min-width: 200px; }
    .cbt-sidebar-left .cbt-submit-btn { width: auto; flex: 0 0 auto; }
    .cbt-sidebar-left { border-radius: var(--cbt-radius); }
    .cbt-header { padding: 0 16px; }
    .cbt-header-center .cbt-timer { font-size: 18px; padding: 4px 14px; }
    .cbt-profile-name { display: none; }
}

@media (max-width: 900px) {
    .qc-arena-header { flex-direction: column; text-align: center; padding: 28px 24px; }
    .qc-arena-header-left { flex-direction: column; text-align: center; }
    .qc-arena-stats { justify-content: center; }
    .qc-arena-header p { max-width: 100%; }
    .qc-comp-grid { grid-template-columns: 1fr; }
    .qc-challenge-grid { grid-template-columns: 1fr; }
    .qc-cgc-battle { gap: 10px; }
    .questudy-pq-filter-row,
    .questudy-dashboard-stats,
    .questudy-quick-actions { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .questudy-generator-wrap, .questudy-exam-interface, .questudy-results-wrap,
    .questudy-past-questions-wrap, .questudy-dashboard-wrap, .questudy-review-wrap,
    .questudy-auth-wrap, .questudy-competition-wrap { padding: 20px 12px; }

    .questudy-gen-header,
    .questudy-pq-header,
    .questudy-dashboard-header,
    .questudy-auth-header,
    .qg-section,
    .questudy-pq-filters,
    .questudy-register-form { padding: 20px; }

    .questudy-gen-header h2,
    .questudy-pq-header h2,
    .questudy-dashboard-header h2,
    .questudy-auth-header h2,
    .questudy-results-header h2 { font-size: 22px; }

    .questudy-pq-filter-row,
    .questudy-dashboard-stats,
    .questudy-quick-actions,
    .questudy-score-details,
    .questudy-form-grid { grid-template-columns: 1fr; }

    .questudy-score-card { flex-direction: column; text-align: center; gap: 20px; }
    .questudy-score-circle { min-width: 0; width: 100%; }

    .questudy-table { display: block; overflow-x: auto; white-space: nowrap; }

    .questudy-pq-mode-selector { align-items: stretch; flex-direction: column; }

    .questudy-weak-cards { grid-template-columns: 1fr; }

    .questudy-exam-sticky-header { flex-wrap: wrap; gap: 8px; padding: 12px; top: 0; }
    .questudy-question-grid { grid-template-columns: repeat(5, 1fr); }

    .cbt-header { flex-wrap: wrap; height: auto; padding: 10px 14px; gap: 8px; }
    .cbt-header-center { order: 3; width: 100%; justify-content: center; }
    .cbt-header-center .cbt-timer { justify-content: center; margin: 0 auto; }
    .cbt-tool-btn { padding: 5px 10px; font-size: 13px; }
    .cbt-navigation { flex-wrap: wrap; justify-content: center; }
    .cbt-jump-wrap select { min-width: 130px; }
    .cbt-palette { grid-template-columns: repeat(5, 1fr); gap: 5px; }
    .cbt-palette-btn { font-size: 11px; }
    .cbt-question-card { padding: 20px 16px; }
    .cbt-question-text { font-size: 15px; }
    .cbt-option { padding: 12px 14px; font-size: 14px; }
    .cbt-main { min-width: 0; }
    .cbt-card { padding: 14px; }
}

/* Competition CBT Live Match Panel */
.cbt-competition-panel { background: linear-gradient(135deg, #eef2ff, #f5f3ff); border: 1.5px solid #c7d2fe; border-radius: 12px; padding: 16px !important; }
.cbt-comp-opponent { text-align: center; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid #e0e7ff; }
.cbt-comp-opp-name { font-size: 16px; font-weight: 700; color: #1e1b4b; }
.cbt-comp-opp-rank { font-size: 12px; color: #6366f1; margin-top: 2px; }
.cbt-comp-stats { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.cbt-comp-stat { display: flex; flex-direction: column; gap: 4px; }
.cbt-comp-stat-label { font-size: 11px; font-weight: 600; color: #475569; text-transform: uppercase; letter-spacing: .5px; }
.cbt-comp-stat-bar { height: 8px; background: #e2e8f0; border-radius: 4px; overflow: hidden; }
.cbt-comp-stat-fill { height: 100%; background: linear-gradient(90deg, #6366f1, #8b5cf6); border-radius: 4px; transition: width .5s ease; }
.cbt-comp-opp-fill { background: linear-gradient(90deg, #ef4444, #f97316); }
.cbt-comp-stat-val { font-size: 12px; font-weight: 600; color: #334155; }
.cbt-comp-time { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: #475569; font-weight: 600; padding: 8px 0; border-top: 1px solid #e0e7ff; }
.cbt-comp-status { display: flex; align-items: center; gap: 6px; font-size: 12px; color: #22c55e; font-weight: 600; padding-top: 6px; }
.cbt-comp-dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; animation: cbtCompPulse 1.5s infinite; }
@keyframes cbtCompPulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }

@media (max-width: 480px) {
    .questudy-question-grid { grid-template-columns: repeat(5, 1fr); }
    .questudy-dashboard-stats { grid-template-columns: 1fr; }
}

/* ============================================================
   CHARLES AI TUTOR — Analysis + Chat
   ============================================================ */
.charles-section { margin: 32px 0; }
.charles-analysis {
    background: linear-gradient(135deg, #EFF6FF 0%, #F5F3FF 100%);
    border: 1px solid #E0E7FF;
    border-radius: 16px;
    padding: 28px;
}
.charles-analysis-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}
.charles-avatar {
    width: 48px; height: 48px; border-radius: 14px;
    background: linear-gradient(135deg, #2563EB, #7C3AED);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.charles-avatar svg { width: 24px; height: 24px; stroke: #fff; fill: none; }
.charles-analysis-header h3 { margin: 0; font-size: 20px; font-weight: 700; color: #0F172A; }
.charles-analysis-header p { margin: 2px 0 0; font-size: 14px; color: #64748B; }
.charles-analysis-body {
    background: #fff; border: 1px solid #E5E7EB; border-radius: 12px;
    padding: 24px; margin-bottom: 16px; font-size: 15px; line-height: 1.7; color: #334155;
}
.charles-analysis-body h2, .charles-analysis-body h3 { margin: 16px 0 8px; color: #0F172A; }
.charles-analysis-body h2 { font-size: 18px; }
.charles-analysis-body h3 { font-size: 16px; }
.charles-analysis-body p { margin: 8px 0; }
.charles-analysis-body ul, .charles-analysis-body ol { margin: 8px 0; padding-left: 20px; }
.charles-analysis-body li { margin: 4px 0; }
.charles-analysis-body strong { color: #0F172A; }
.charles-analysis-body em { color: #64748B; }
.charles-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: 12px; border: none;
    background: linear-gradient(135deg, #2563EB, #1D4ED8); color: #fff;
    font-size: 15px; font-weight: 600; cursor: pointer;
    transition: all 0.25s ease; box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}
.charles-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,0.35); }
.charles-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.charles-loading {
    display: flex; align-items: center; gap: 12px;
    padding: 16px 0; font-size: 14px; color: #64748B;
}
.charles-spinner {
    width: 20px; height: 20px; border: 3px solid #E0E7FF;
    border-top-color: #2563EB; border-radius: 50%;
    animation: charlesSpin 0.7s linear infinite;
}
@keyframes charlesSpin { to { transform: rotate(360deg); } }

/* Charles Chat Widget */
.charles-chat {
    position: fixed; bottom: 24px; right: 24px; width: 380px; max-height: 520px;
    background: #fff; border: 1px solid #E5E7EB; border-radius: 20px;
    box-shadow: 0 20px 50px rgba(15,23,42,0.15); display: flex; flex-direction: column;
    z-index: 9998; overflow: hidden; animation: charlesSlideUp 0.3s ease-out;
}
@keyframes charlesSlideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.charles-chat-header {
    display: flex; align-items: center; gap: 12px; padding: 16px 20px;
    background: linear-gradient(135deg, #2563EB, #1D4ED8); color: #fff;
}
.charles-chat-avatar {
    width: 36px; height: 36px; border-radius: 10px;
    background: rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center;
}
.charles-chat-avatar svg { width: 20px; height: 20px; stroke: #fff; fill: none; }
.charles-chat-info { flex: 1; }
.charles-chat-name { font-size: 15px; font-weight: 700; display: block; }
.charles-chat-status { font-size: 12px; opacity: 0.8; }
.charles-chat-close {
    width: 32px; height: 32px; border-radius: 8px; border: none;
    background: rgba(255,255,255,0.15); color: #fff; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s;
}
.charles-chat-close:hover { background: rgba(255,255,255,0.3); }
.charles-chat-messages {
    flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px;
    max-height: 340px; min-height: 200px;
}
.charles-msg { display: flex; gap: 8px; align-items: flex-start; }
.charles-msg-ai { flex-direction: row; }
.charles-msg-user { flex-direction: row-reverse; }
.charles-msg-avatar {
    width: 28px; height: 28px; border-radius: 8px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700;
}
.charles-msg-ai .charles-msg-avatar { background: linear-gradient(135deg, #2563EB, #7C3AED); color: #fff; }
.charles-msg-user .charles-msg-avatar { background: #F1F5F9; color: #475569; }
.charles-msg-bubble {
    max-width: 80%; padding: 10px 14px; border-radius: 14px;
    font-size: 14px; line-height: 1.6; color: #334155;
}
.charles-msg-ai .charles-msg-bubble { background: #F1F5F9; border-bottom-left-radius: 4px; }
.charles-msg-user .charles-msg-bubble { background: #2563EB; color: #fff; border-bottom-right-radius: 4px; }
.charles-msg-bubble strong { color: inherit; }
.charles-msg-typing { display: flex; gap: 4px; padding: 8px 14px; }
.charles-msg-typing span { width: 6px; height: 6px; border-radius: 50%; background: #94A3B8; animation: charlesDot 1.2s infinite; }
.charles-msg-typing span:nth-child(2) { animation-delay: 0.2s; }
.charles-msg-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes charlesDot { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-4px); } }
.charles-chat-input-wrap {
    display: flex; align-items: flex-end; gap: 8px; padding: 12px 16px;
    border-top: 1px solid #F1F5F9;
}
.charles-chat-input {
    flex: 1; border: 1px solid #E2E8F0; border-radius: 12px; padding: 10px 14px;
    font-size: 14px; font-family: inherit; resize: none; line-height: 1.4;
    max-height: 80px; outline: none; transition: border-color 0.2s;
}
.charles-chat-input:focus { border-color: #2563EB; }
.charles-chat-send {
    width: 36px; height: 36px; border-radius: 10px; border: none;
    background: #2563EB; color: #fff; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s; flex-shrink: 0;
}
.charles-chat-send:hover { background: #1D4ED8; }
@media (max-width: 480px) {
    .charles-chat { width: calc(100% - 32px); right: 16px; bottom: 16px; max-height: 460px; }
}