/* CSS thuần cho AMP Quiz - Chỉ dành cho Quiz */

:root {
    --bg: #f4f6fb;
    --card: #ffffff;
    --stroke: #e3e8f4;
    --text: #0f172a;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-soft: #e0e7ff;
    --success: #16a34a;
    --danger: #dc2626;
    --radius: 20px;
}

/* Quiz Container */
.amp-quiz-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 16px;
}

/* Thi AMP: khối chọn hạng */
.amp-exam-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}

.amp-exam-type-card {
    border-radius: 16px;
    border: 1px solid var(--stroke);
    background: #f8fafc;
    padding: 10px 12px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.amp-exam-type-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.12);
    transform: translateY(-1px);
}

.amp-exam-type-main {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
}

.amp-exam-type-main strong {
    font-size: 14px;
    color: var(--text);
}

.amp-exam-type-main span {
    font-size: 12px;
    color: var(--muted);
}

.amp-exam-type-sub {
    font-size: 12px;
    color: var(--muted);
}

/* Quiz Header - Tương tự PC nhưng tối ưu cho AMP */
.quiz-header {
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 18px;
    margin-bottom: 18px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
    color: white;
}

.quiz-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.quiz-stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 14px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

/* Progress Table */
.progress-table-wrapper {
    margin-top: 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 12px;
    backdrop-filter: blur(10px);
}

.progress-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

.progress-table thead th {
    text-align: left;
    padding: 8px 10px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    border-bottom: 2px solid rgba(255, 255, 255, 0.2);
    font-size: 11px;
}

.progress-table tbody tr {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background 0.2s ease;
}

.progress-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.1);
}

.progress-table tbody tr:last-child {
    border-bottom: none;
}

.progress-table td {
    padding: 8px 10px;
    color: rgba(255, 255, 255, 0.95);
    font-size: 12px;
}

.progress-table td:first-child {
    font-weight: 500;
    min-width: 100px;
}

.progress-table td:nth-child(2) {
    width: 50%;
    min-width: 150px;
}

.progress-table td:last-child {
    text-align: right;
    font-weight: 600;
    min-width: 50px;
}

.progress-bar-wrapper {
    position: relative;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    height: 20px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    border-radius: 20px;
    transition: width 0.3s ease;
    position: relative;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 10px;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    z-index: 1;
    white-space: nowrap;
}

.progress-count {
    color: rgba(255, 255, 255, 0.95);
    font-size: 13px;
}

@media (max-width: 768px) {
    .quiz-header {
        padding: 16px;
    }
    
    .quiz-header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .quiz-stats {
        width: 100%;
        gap: 8px;
    }
    
    .stat-item {
        flex: 1;
        min-width: 0;
        font-size: 13px;
        padding: 6px 12px;
    }
    
    .progress-table {
        font-size: 11px;
    }
    
    .progress-table td {
        padding: 6px 8px;
        font-size: 11px;
    }
    
    .progress-table td:first-child {
        min-width: 80px;
    }
    
    .progress-table td:nth-child(2) {
        min-width: 120px;
    }
}

/* Quiz Card */
.amp-quiz-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
    border: 1px solid var(--stroke);
    margin-bottom: 18px;
}

.amp-question-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Badge Row */
.amp-badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 6px;
}

.amp-badge {
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    background: rgba(204, 251, 241, 0.8);
    color: #0d9488;
}

.amp-badge-soft {
    background: rgba(226, 232, 240, 0.8);
    color: var(--muted);
}

.amp-badge-diemliet {
    background: rgba(254, 226, 226, 0.9);
    color: #b91c1c;
}

/* Question Text */
.amp-question-text {
    font-size: 17px;
    line-height: 1.6;
    margin: 0;
}

/* Question Image */
.amp-question-image-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 62%;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.18);
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
}

.amp-question-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
}

/* Answers */
.amp-answers-wrapper {
    margin: 8px 0;
}

.amp-answers-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.amp-answer-item {
    width: 100%;
}

.amp-answer-btn {
    width: 100%;
    border-radius: 16px;
    border: 1px solid var(--stroke);
    background: #f8fafc;
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    text-align: left;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.amp-answer-btn:hover {
    border-color: var(--primary);
    background: #eef2ff;
}

.amp-answer-btn.is-selected {
    border-color: var(--primary);
    background: #eef2ff;
}

.amp-answer-btn.is-correct {
    border-color: var(--success);
    background: #dcfce7;
}

.amp-answer-btn.is-incorrect {
    border-color: var(--danger);
    background: #fee2e2;
}

.amp-answer-prefix {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: #0f172a;
    color: #f8fafc;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.amp-answer-btn.is-correct .amp-answer-prefix,
.amp-answer-btn.is-incorrect .amp-answer-prefix {
    background: transparent;
    color: inherit;
    font-size: 18px;
}

.amp-answer-text {
    flex: 1;
}

/* Navigation Buttons */
.amp-nav-buttons {
    position: fixed;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    pointer-events: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4px;
    z-index: 999;
    max-width: 100vw;
}

.amp-nav-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
    pointer-events: all;
    flex-shrink: 0;
}

.amp-nav-btn:hover {
    background: #1d4ed8;
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.amp-nav-btn:active {
    transform: scale(0.95);
}

.amp-nav-btn:disabled {
    background: #cbd5e1;
    color: #94a3b8;
    cursor: not-allowed;
    opacity: 0.5;
    transform: none;
}

.amp-nav-btn svg {
    display: block;
}

@media (min-width: 768px) {
    .amp-nav-buttons {
        width: calc(100vw - 32px);
        max-width: 720px;
        left: 50%;
        right: auto;
        transform: translate(-50%, -50%);
        padding: 0 16px;
    }
}

@media (max-width: 768px) {
    .amp-nav-btn {
        width: 40px;
        height: 40px;
    }
}

/* Explanation */
.amp-explanation-card {
    border-radius: 18px;
    border: 1px dashed var(--stroke);
    background: #f8fafc;
    padding: 14px 16px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--muted);
    min-height: 60px;
    display: flex;
    align-items: center;
}

.amp-explanation-card.has-content {
    border: 1px solid #bae6fd;
    background: #e0f2fe;
    color: var(--text);
}

.amp-explanation-placeholder {
    font-weight: 600;
    width: 100%;
}

.amp-explanation-content {
    width: 100%;
}

.amp-explanation-status {
    font-weight: 600;
    margin-bottom: 6px;
}

.amp-explanation-status.positive {
    color: var(--success);
}

.amp-explanation-status.negative {
    color: var(--danger);
}

.amp-explanation-title {
    font-weight: 600;
    margin-bottom: 4px;
}

/* Question Numbers Scroll */
.amp-question-numbers-scroll {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-top: 1px solid var(--stroke);
    box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.1);
    padding: 12px 0;
    z-index: 1000;
    max-width: 100%;
}

.amp-question-numbers-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 12px;
}

.amp-question-numbers-wrapper {
    flex: 1;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 4px;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    scroll-snap-type: x proximity;
}

.amp-question-number-item {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 2px solid var(--stroke);
    background: #fff;
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    scroll-snap-align: center;
    position: relative;
}

.amp-question-number-item:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
    transform: translateY(-2px);
}

.amp-question-number-item.is-active {
    background: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #fff;
    transform: scale(1.15);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
    z-index: 1;
}

/* Câu đã trả lời đúng - background xanh (chỉ khi không active) */
.amp-question-number-item.has-answer-correct:not(.is-active) {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}

/* Câu đã trả lời sai - background đỏ (chỉ khi không active) */
.amp-question-number-item.has-answer-incorrect:not(.is-active) {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

/* Scrollbar */
.amp-question-numbers-scroll::-webkit-scrollbar {
    height: 6px;
}

.amp-question-numbers-scroll::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 3px;
}

.amp-question-numbers-scroll::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.amp-question-numbers-scroll::-webkit-scrollbar-thumb:hover {
    background: #1d4ed8;
}

@media (min-width: 768px) {
    .amp-question-numbers-scroll {
        width: calc(100vw - 32px);
        max-width: 720px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        border-radius: 18px 18px 0 0;
    }
}

/* Overlay danh sách số câu */
.amp-open-overlay-btn {
    flex-shrink: 0;
    width: 48px;
    height: 44px;
    border-radius: 12px;
    border: 2px solid var(--primary);
    background: var(--primary);
    padding: 0 6px;
    border-left: 2px solid var(--primary);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.amp-open-overlay-btn:active {
    transform: scale(0.97);
}

.amp-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.65);
    backdrop-filter: blur(4px);
    z-index: 1200;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.amp-overlay.is-open {
    display: flex;
}

.amp-overlay-inner {
    width: 100%;
    max-width: 760px;
    max-height: 90vh;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25);
    display: flex;
    flex-direction: column;
}

.amp-overlay-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid #e2e8f0;
}

.amp-overlay-header h3 {
    margin: 0;
    font-size: 16px;
}

.amp-overlay-close {
    border: none;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 6px 10px;
    cursor: pointer;
    font-weight: 700;
}

.amp-overlay-grid {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
    gap: 8px;
}

.amp-overlay-grid .amp-question-number-item {
    width: 100%;
    height: 44px;
}

.amp-overlay-grid .amp-question-number-item.is-active {
    transform: none;
}

.amp-overlay-sections {
    padding: 8px 12px 16px;
    overflow-y: auto;
    max-height: calc(90vh - 70px);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.amp-overlay-section-title {
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

/* ==================== PHẦN 1: CHỌN ĐỀ THI ==================== */
.amp-exam-selection-section {
    margin-bottom: 24px;
}

.amp-exam-type-selection {
    width: 100%;
}

.amp-exam-type-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.amp-exam-type-title .amp-icon {
    font-size: 24px;
}

.amp-exam-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.amp-exam-type-card {
    background: var(--card);
    border: 2px solid var(--stroke);
    border-radius: 16px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: visible;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.amp-exam-type-card:active {
    transform: scale(0.98);
}

.amp-exam-card-pho-bien {
    border: 3px solid #fbbf24;
    box-shadow: 0 4px 16px rgba(251, 191, 36, 0.25);
    background: linear-gradient(135deg, #ffffff 0%, #fffbeb 100%);
}

.amp-exam-badge-pho-bien {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    font-weight: 700;
    font-size: 10px;
    text-transform: uppercase;
    border-radius: 6px;
    border: 2px solid #fbbf24;
}

.amp-exam-badge-nang-hang {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 10px;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
    color: #3730a3;
    font-weight: 700;
    font-size: 10px;
    text-transform: uppercase;
    border-radius: 6px;
    border: 2px solid #6366f1;
}

.amp-exam-card-icon {
    font-size: 40px;
    margin: 8px 0;
}

.amp-exam-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.amp-exam-card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.amp-exam-card-info {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin: 8px 0;
}

.amp-exam-info-item {
    font-size: 13px;
    color: var(--muted);
    font-weight: 500;
}

.amp-exam-card-description {
    font-size: 12px;
    color: var(--muted);
    line-height: 1.4;
    margin: 4px 0;
}

.amp-exam-card-pass {
    font-size: 14px;
    font-weight: 600;
    color: var(--success);
    margin: 4px 0;
}

.amp-exam-badge-diemliet {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(254, 226, 226, 0.9);
    color: #b91c1c;
    font-size: 11px;
    font-weight: 600;
    border-radius: 6px;
    margin-top: 4px;
}

/* Bước 2: Chọn đề thi */
.amp-exam-number-selection {
    width: 100%;
}

.amp-exam-number-selection-header {
    margin-bottom: 20px;
}

.amp-btn-back-exam-type {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--card);
    border: 2px solid var(--stroke);
    border-radius: 12px;
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 16px;
}

.amp-btn-back-exam-type:active {
    transform: scale(0.98);
}

.amp-exam-number-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.amp-exam-numbers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.amp-exam-number-card {
    aspect-ratio: 1;
    border: 2px solid var(--stroke);
    border-radius: 12px;
    background: var(--card);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.amp-exam-number-card:active {
    transform: scale(0.95);
}

.amp-exam-number-card.has-history.passed {
    background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
    border-color: var(--success);
    color: var(--success);
}

.amp-exam-number-card.has-history.failed {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-color: var(--danger);
    color: var(--danger);
}

/* Card Câu hỏi ngẫu nhiên */
.amp-exam-random-card {
    aspect-ratio: 1;
    border: 2px solid var(--primary);
    border-radius: 12px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 60px;
    padding: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.amp-exam-random-card:active {
    transform: scale(0.95);
}

.amp-exam-random-icon {
    font-size: 24px;
}

.amp-exam-random-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 100%;
}

.amp-exam-random-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
    line-height: 1.3;
}

/* ==================== PHẦN 2: ĐANG THI ==================== */
.amp-exam-in-progress-section {
    width: 100%;
}

.amp-exam-header {
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
    border-radius: 16px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.2);
    color: white;
}

.amp-exam-header-content {
    margin-bottom: 12px;
}

.amp-exam-header-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.amp-exam-header-stat-item {
    font-size: 13px;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 12px;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.amp-exam-timer-container {
    margin-top: 12px;
}

.amp-exam-progress-container {
    height: 32px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 16px;
    padding: 3px;
    position: relative;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.amp-exam-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    border-radius: 12px;
    position: absolute;
    top: 0;
    left: 0;
    transition: width 0.3s ease;
    width: 100%;
}

.amp-exam-progress-bar.danger {
    background: linear-gradient(90deg, #ef4444 0%, #dc2626 100%);
}

.amp-exam-timer-text {
    font-size: 13px;
    font-weight: 700;
    text-align: center;
    color: white;
    width: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.amp-exam-main-wrapper {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.amp-exam-sidebar-mobile {
    background: var(--card);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
    border: 1px solid var(--stroke);
}

.amp-exam-sidebar-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.amp-question-numbers-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
    padding: 4px;
}

.amp-exam-sidebar-submit {
    margin-top: 16px;
}

.amp-btn-submit {
    width: 100%;
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 16px rgba(22, 163, 74, 0.3);
}

.amp-btn-submit:active {
    transform: scale(0.98);
}


.amp-answer-button {
    width: 100%;
    border-radius: 12px;
    border: 2px solid var(--stroke);
    background: #f8fafc;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    text-align: left;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.amp-answer-button:active {
    transform: scale(0.98);
}

.amp-answer-button.selected {
    border-color: var(--primary);
    background: #eef2ff;
}

.amp-answer-button.correct {
    border-color: var(--success);
    background: #dcfce7;
    color: var(--success);
}

.amp-answer-button.incorrect {
    border-color: var(--danger);
    background: #fee2e2;
    color: var(--danger);
}

.amp-answer-letter {
    font-weight: 600;
    min-width: 24px;
}

.amp-answer-text {
    flex: 1;
}

.amp-explanation-status.correct {
    color: var(--success);
}

.amp-explanation-status.incorrect {
    color: var(--danger);
}

/* ==================== PHẦN 3: KẾT QUẢ ==================== */
.amp-exam-result-section {
    width: 100%;
    margin-bottom: 24px;
}

.amp-result-board {
    background: var(--card);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
    border: 1px solid var(--stroke);
}

.amp-result-header {
    margin-bottom: 16px;
}

.amp-result-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.amp-result-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.amp-btn-primary {
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.amp-btn-primary:active {
    transform: scale(0.98);
}

.amp-result-overview-compact {
    margin-top: 16px;
}

.amp-result-main-row {
    margin-bottom: 12px;
}

.amp-result-main-extra {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.amp-result-main-extra-item {
    flex: 1;
    min-width: 120px;
    background: #f8fafc;
    border: 1px solid var(--stroke);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: center;
}

.amp-result-main-extra-item-result {
    min-width: 100%;
}

.amp-result-main-extra-label {
    font-size: 12px;
    color: var(--muted);
    font-weight: 500;
}

.amp-result-main-extra-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.amp-result-main-extra-value.green {
    color: var(--success);
}

.amp-result-main-extra-value.red {
    color: var(--danger);
}

.amp-result-message-compact {
    margin-top: 12px;
}

.amp-result-message {
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    margin: 0;
    padding: 12px;
    background: #f8fafc;
    border-radius: 12px;
}

.amp-review-mode-section {
    width: 100%;
    margin-top: 24px;
}

.amp-review-mode-section .amp-question-content {
    background: var(--card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
    border: 1px solid var(--stroke);
    margin-bottom: 18px;
}

/* ==================== PHẦN 4: LỊCH SỬ ==================== */
.amp-exam-history-section {
    width: 100%;
    margin-top: 24px;
}

.amp-history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.amp-history-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.amp-btn-clear-history {
    padding: 8px 16px;
    background: var(--card);
    border: 2px solid var(--stroke);
    border-radius: 10px;
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.amp-btn-clear-history:active {
    transform: scale(0.98);
}

.amp-history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.amp-history-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--muted);
}

.amp-history-empty .amp-icon {
    font-size: 48px;
    margin-bottom: 12px;
    display: block;
}

.amp-history-item {
    background: var(--card);
    border: 1px solid var(--stroke);
    border-radius: 12px;
    padding: 16px;
    transition: all 0.2s;
}

.amp-history-item-header {
    margin-bottom: 12px;
}

.amp-history-item-title {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.amp-history-exam-type {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
}

.amp-history-exam-number {
    font-size: 14px;
    color: var(--muted);
}

.amp-history-status {
    font-size: 13px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 6px;
}

.amp-history-status.passed {
    background: #dcfce7;
    color: var(--success);
}

.amp-history-status.failed {
    background: #fee2e2;
    color: var(--danger);
}

.amp-history-item-date {
    font-size: 12px;
    color: var(--muted);
}

.amp-history-item-body {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.amp-history-stat {
    display: flex;
    align-items: center;
    gap: 6px;
}

.amp-history-stat-label {
    font-size: 13px;
    color: var(--muted);
}

.amp-history-stat-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.amp-history-stat-value.green {
    color: var(--success);
}

.amp-history-stat-value.red {
    color: var(--danger);
}

/* ==================== MODAL ==================== */
.amp-quiz-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.amp-quiz-modal[style*="display: block"] {
    display: flex !important;
}

.amp-quiz-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
}

.amp-quiz-modal-dialog {
    position: relative;
    max-width: 400px;
    width: 100%;
    background: var(--card);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.3);
    overflow: hidden;
    z-index: 1;
}

.amp-quiz-modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--stroke);
}

.amp-quiz-modal-header h4 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.amp-quiz-modal-body {
    padding: 20px;
    font-size: 15px;
    color: var(--text);
    line-height: 1.6;
}

.amp-quiz-modal-footer {
    padding: 16px 20px;
    display: flex;
    gap: 10px;
    border-top: 1px solid var(--stroke);
}

.amp-btn-secondary {
    padding: 12px 20px;
    background: #f1f5f9;
    color: var(--text);
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
}

.amp-btn-secondary:active {
    transform: scale(0.98);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 480px) {
    .amp-exam-type-grid {
        grid-template-columns: 1fr;
    }
    
    .amp-exam-numbers-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .amp-question-numbers-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .amp-result-main-extra {
        flex-direction: column;
    }
    
    .amp-result-main-extra-item {
        min-width: 100%;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .amp-exam-type-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .amp-exam-numbers-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 769px) {
    .amp-exam-type-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .amp-exam-numbers-grid {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .amp-exam-main-wrapper {
        flex-direction: row;
    }
    
    .amp-exam-sidebar-mobile {
        width: 280px;
        flex-shrink: 0;
    }
}