/* 전역 스타일 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --warning-color: #f59e0b;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', 'Malgun Gothic', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 헤더 */
.app-header {
    background: var(--card-background);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-image {
    height: 80px;
    width: auto;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* 탭 네비게이션 */
.tab-navigation {
    background: var(--card-background);
    display: flex;
    border-bottom: 2px solid var(--border-color);
    padding: 0 2rem;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

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

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

/* 메인 콘텐츠 */
.main-content {
    padding: 2rem;
}

.tab-content {
    display: none;
}

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

/* 섹션 헤더 */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

/* 버튼 스타일 */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-primary:hover {
    background: #1d4ed8;
}

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

.btn-secondary:hover {
    background: #475569;
}

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

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

.btn-danger:hover {
    background: #b91c1c;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* 폼 스타일 */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.form-group-header label {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.help-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
}

/* 시험 목록 */
.exam-list-container {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.exam-list {
    display: grid;
    gap: 1rem;
}

.exam-item {
    padding: 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exam-item:hover {
    background: var(--background-color);
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.exam-item.selected {
    background: rgba(37, 99, 235, 0.05);
    border-color: var(--primary-color);
}

.exam-item-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.exam-item-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 페이지네이션 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.pagination-btn {
    padding: 0.5rem 1rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    color: var(--text-primary);
    min-width: 40px;
}

.pagination-btn:hover {
    background: var(--background-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    font-weight: 600;
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 학생 관리 */
.student-management-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
}

.alert-info {
    background: #e3f2fd;
    border: 1px solid #2196f3;
    color: #1565c0;
}

.alert-warning {
    background: #fff3e0;
    border: 1px solid #ff9800;
    color: #e65100;
}

.all-students-section {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.student-list {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.student-item {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.student-item:hover {
    background: var(--background-color);
    border-color: var(--primary-color);
}

.student-item-info h4 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.student-item-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.student-item-actions {
    display: flex;
    gap: 0.5rem;
}

/* 중복 학생 */
#duplicateStudentsSection {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.duplicate-students-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.duplicate-group {
    border: 2px solid #ff9800;
    border-radius: 0.5rem;
    padding: 1.5rem;
    background: #fff3e0;
}

.duplicate-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #ff9800;
    font-size: 1.1rem;
}

.badge {
    background: #ff9800;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
}

.duplicate-group-students {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.duplicate-student-card {
    position: relative;
}

.duplicate-student-card input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.duplicate-student-card label {
    display: block;
    padding: 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.duplicate-student-card input[type="radio"]:checked + label {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

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

.student-name {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.student-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.student-stats {
    font-size: 0.8rem;
    color: var(--success-color);
    margin-top: 0.5rem;
    font-weight: 500;
}

.student-id {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-family: monospace;
}

.duplicate-group-actions {
    display: flex;
    justify-content: center;
    padding-top: 1rem;
}

/* 시험 상세 정보 */
.exam-detail-section {
    background: var(--card-background);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.detail-actions {
    display: flex;
    gap: 0.5rem;
}

.exam-info-form {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

/* 문제 목록 */
.questions-container h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.question-list {
    display: grid;
    gap: 1rem;
}

.question-item {
    padding: 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--background-color);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.8rem;
}

.question-title {
    font-weight: 600;
    color: var(--text-primary);
}

.question-type-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 0.25rem;
    font-size: 0.8rem;
    font-weight: 500;
}

.question-type-badge.multiple {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.question-type-badge.essay {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.question-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.question-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.8rem;
}

/* 답안 입력 */
.answer-input-controls {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.student-input-group {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr 1fr;
    gap: 0.5rem;
}

.answer-toolbar {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.import-answers-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.answer-form-section {
    background: var(--card-background);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.student-info-display {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.answer-form-container {
    display: grid;
    gap: 1.5rem;
}

.answer-item {
    padding: 1.2rem;
    background: var(--background-color);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.answer-question-info {
    margin-bottom: 0.8rem;
}

.answer-question-info h5 {
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.answer-input-field {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.answer-input-field.essay {
    flex-direction: column;
    align-items: stretch;
}

.answer-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.5rem;
}

/* 채점 및 분석 */
.grading-controls {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.grading-results-section {
    display: grid;
    gap: 2rem;
}

.grading-summary {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.summary-card {
    padding: 1.2rem;
    background: var(--background-color);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
}

.summary-card h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.summary-card .value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* 서술형 채점 */
.essay-grading-section {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.essay-grading-list {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.essay-grading-item {
    padding: 1.2rem;
    background: var(--background-color);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.essay-grading-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.8rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--border-color);
}

.essay-student-answer {
    margin: 0.8rem 0;
    padding: 1rem;
    background: white;
    border-radius: 0.375rem;
    border: 1px solid var(--border-color);
}

.essay-score-input {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-top: 0.8rem;
}

.essay-score-input input {
    width: 80px;
}

/* 성적표 테이블 */
.results-table-section {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.results-table-section h3 {
    margin-bottom: 1rem;
}

.results-table {
    overflow-x: auto;
    margin-top: 1rem;
}

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

.results-table th,
.results-table td {
    padding: 0.8rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.results-table th {
    background: var(--background-color);
    font-weight: 600;
    color: var(--text-primary);
}

.results-table tbody tr:hover {
    background: var(--background-color);
}

/* 성적표 생성 */
.report-controls {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.report-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.report-preview {
    background: var(--card-background);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    min-height: 400px;
}

/* 모달 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--card-background);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow-y: auto;
    margin: 2rem;
}

.modal-content.modal-lg {
    max-width: 900px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

/* 선택지 입력 */
.choice-item {
    padding: 1rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    margin-bottom: 0.8rem;
}

.choice-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

/* 반응형 */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
    }

    .tab-navigation {
        overflow-x: auto;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .student-input-group {
        grid-template-columns: 1fr;
    }

    .detail-header,
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

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

/* 인쇄 스타일 */
@media print {
    .app-header,
    .tab-navigation,
    .report-controls {
        display: none;
    }

    .report-preview {
        box-shadow: none;
    }
}

/* 빈 상태 */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state-text {
    font-size: 1.1rem;
}

/* 문제별 분석 */
.question-analysis-section {
    margin-top: 2rem;
}

.question-analysis {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.question-analysis-item {
    background: var(--card-background);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
}

.question-analysis-item.clickable {
    cursor: pointer;
}

.question-analysis-item.clickable:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.question-analysis-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.question-info {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.question-info strong {
    font-size: 1.1rem;
}

.question-domain {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.question-points {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.question-stats {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.wrong-rate {
    font-weight: 700;
    font-size: 1.1rem;
}

.answer-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.question-passage {
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 선택지 통계 */
.choice-stats h5,
.score-distribution h5 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.choice-bars {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.choice-bar-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.choice-label {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.9rem;
}

.choice-num {
    font-weight: 600;
    min-width: 40px;
}

.choice-num.correct {
    color: var(--success-color);
}

.correct-badge {
    background: var(--success-color);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.choice-count {
    margin-left: auto;
    color: var(--text-secondary);
}

.choice-bar-container {
    height: 28px;
    background: var(--background-color);
    border-radius: 0.25rem;
    overflow: hidden;
}

.choice-bar {
    height: 100%;
    background: var(--secondary-color);
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.5rem;
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
}

.choice-bar.correct {
    background: var(--success-color);
}

.choice-explanation {
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--border-color);
}

/* 점수 분포 */
.score-dist-chart {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.score-dist-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.score-label {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.9rem;
}

.score-value {
    font-weight: 600;
    min-width: 50px;
}

.score-value.full-score {
    color: var(--success-color);
}

.score-count {
    margin-left: auto;
    color: var(--text-secondary);
}

.score-bar-container {
    height: 24px;
    background: var(--background-color);
    border-radius: 0.25rem;
    overflow: hidden;
}

.score-bar {
    height: 100%;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

.score-bar.full-score {
    background: var(--success-color);
}

.model-answer {
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.model-answer summary {
    cursor: pointer;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    user-select: none;
}

.model-answer summary:hover {
    color: var(--primary-color);
    opacity: 0.8;
}

.model-answer-content {
    margin-top: 0.75rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    border-left: 3px solid var(--primary-color);
    white-space: pre-wrap;
    line-height: 1.8;
}

.click-hint {
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    text-align: center;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

/* 모달 내 문제 정보 */
.modal-question-info {
    background: var(--background-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.modal-info-row {
    display: flex;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.modal-info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    min-width: 100px;
    color: var(--text-secondary);
}

.info-value {
    flex: 1;
    color: var(--text-primary);
}

/* 클릭 가능한 요소 */
.clickable {
    cursor: pointer;
    transition: all 0.2s;
}

.clickable:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* 학생 목록 모달 */
.student-list-info {
    margin-bottom: 1.5rem;
}

.choice-info {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    font-size: 1.1rem;
}

.choice-info.correct-choice {
    background: rgba(34, 197, 94, 0.1);
    border: 2px solid var(--success-color);
}

.choice-info.wrong-choice {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--danger-color);
}

.choice-badge {
    font-size: 1.2rem;
    font-weight: 700;
    padding: 0.5rem 1rem;
    background: white;
    border-radius: 0.375rem;
}

.choice-status {
    font-weight: 600;
}

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

.wrong-choice .choice-status {
    color: var(--danger-color);
}

.student-list-table {
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.student-list-table thead {
    background: var(--background-color);
}

.student-list-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
}

.student-list-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.student-list-table tbody tr:hover {
    background: var(--background-color);
}

.student-list-table tbody tr:last-child td {
    border-bottom: none;
}

/* 검색 가능한 드롭다운 */
.searchable-select {
    position: relative;
}

.custom-select {
    position: relative;
    width: 100%;
}

.custom-select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.custom-select-trigger:hover {
    border-color: var(--primary-color);
}

.custom-select-trigger:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.custom-select-value {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.custom-select-arrow {
    margin-left: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.custom-select-dropdown.open + .custom-select-trigger .custom-select-arrow {
    transform: rotate(180deg);
}

.custom-select-dropdown {
    position: absolute;
    top: calc(100% + 0.25rem);
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: none;
    max-height: 400px;
    overflow: hidden;
}

.custom-select-dropdown.open {
    display: block;
}

.custom-select-search {
    width: 100%;
    padding: 0.625rem;
    border: none;
    border-bottom: 1px solid var(--border-color);
    outline: none;
    font-size: 0.95rem;
}

.custom-select-search:focus {
    background: var(--background-color);
}

.custom-select-options {
    max-height: 300px;
    overflow-y: auto;
}

.custom-select-option {
    padding: 0.625rem;
    cursor: pointer;
    transition: background 0.15s;
    border-bottom: 1px solid var(--background-color);
}

.custom-select-option:last-child {
    border-bottom: none;
}

.custom-select-option:hover {
    background: var(--background-color);
}

.custom-select-option.selected {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.custom-select-option.selected:hover {
    background: var(--primary-color);
}

/* 학생별 오답 노트 스타일 */
.wrong-note-controls {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.wrong-note-controls .form-group {
    margin-bottom: 1rem;
}

.exam-selection-section {
    margin-top: 1.5rem;
}

.exam-checkbox-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 1rem;
    background: white;
    margin-bottom: 1rem;
}

.exam-checkbox-item {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    border-bottom: 1px solid var(--background-color);
    cursor: pointer;
    transition: background 0.15s;
}

.exam-checkbox-item:last-child {
    border-bottom: none;
}

.exam-checkbox-item:hover {
    background: var(--background-color);
}

.exam-checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 0.75rem;
    cursor: pointer;
}

.exam-checkbox-item label {
    flex: 1;
    cursor: pointer;
    font-weight: 500;
}

.exam-checkbox-item small {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.wrong-note-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.wrong-note-results-section {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.wrong-note-summary {
    margin-bottom: 2rem;
}

.charts-section {
    margin-bottom: 2rem;
}

.trend-chart-section,
.domain-stats-section,
.passage-stats-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.trend-chart,
.domain-chart {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.passage-stats-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.passage-stat-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: var(--background-color);
    border-radius: 0.375rem;
    border-left: 4px solid var(--primary-color);
}

.passage-stat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.passage-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.passage-score {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.passage-bars {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.passage-bar-container {
    display: flex;
    height: 24px;
    border-radius: 4px;
    overflow: hidden;
    background: #e5e7eb;
}

.passage-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    transition: width 0.3s;
}

.passage-bar.correct {
    background: var(--success-color);
}

.passage-bar.wrong {
    background: var(--danger-color);
}

.passage-stats-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    padding: 0.25rem 0;
}

.correct-text {
    color: var(--success-color);
    font-weight: 600;
}

.wrong-text {
    color: var(--danger-color);
    font-weight: 600;
}

.wrong-note-preview {
    margin-top: 2rem;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
}

.wrong-note-container {
    padding: 2rem;
}

.wrong-note-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.wrong-note-header h2 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.wrong-note-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.wrong-questions-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.wrong-question-item {
    padding: 1.5rem;
    background: var(--background-color);
    border-radius: 0.5rem;
    border-left: 4px solid var(--danger-color);
}

.wrong-question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.question-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.question-meta {
    text-align: right;
    font-size: 0.875rem;
}

.question-exam {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.question-info {
    color: var(--text-primary);
    font-weight: 500;
}

.question-feedback {
    margin-top: 0.75rem;
    padding: 1rem;
    background: white;
    border-radius: 0.375rem;
    border: 1px solid var(--border-color);
}

.feedback-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.feedback-content {
    color: var(--text-primary);
    line-height: 1.6;
}

.feedback-row {
    margin-bottom: 0.5rem;
}

.feedback-row:last-child {
    margin-bottom: 0;
}

/* 데이터 로딩 완료 모달 */
.loading-complete-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease-in;
}

.loading-complete-content {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 90%;
    animation: slideIn 0.3s ease-out;
}

.loading-complete-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.loading-complete-icon {
    font-size: 2rem;
}

.loading-complete-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.loading-complete-body {
    padding: 1.5rem;
}

.loading-complete-body p {
    margin: 0 0 1rem 0;
    color: var(--text-secondary);
}

.loading-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1rem 0;
}

.loading-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: 0.375rem;
}

.loading-stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.loading-stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.loading-time {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

.loading-complete-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 특정 탭 글자 크기 조정 (성적표, 오답노트 제외) */
#exam-management,
#answer-input,
#grading {
    font-size: 80%;
}

/* 학생별 성적 테이블 추가 축소 */
.results-table-section {
    font-size: 75%;
}

.results-table table {
    font-size: 85%;
}

.results-table th,
.results-table td {
    padding: 0.4rem 0.3rem;
    white-space: nowrap;
}

.results-table td {
    font-size: 0.9em;
}

/* 모바일 반응형 스타일 */
@media (max-width: 768px) {
    /* 기본 폰트 크기 50% 축소 */
    html {
        font-size: 50%;
    }

    /* 헤더 */
    .app-header h1 {
        font-size: 0.75rem;
    }

    .app-header {
        padding: 0.75rem 1rem;
    }

    /* 탭 네비게이션 */
    .tab-btn {
        font-size: 0.5rem;
        padding: 0.4rem 0.6rem;
    }

    /* 버튼 */
    .btn {
        font-size: 0.5rem;
        padding: 0.3rem 0.6rem;
    }

    .btn-sm {
        font-size: 0.45rem;
        padding: 0.25rem 0.5rem;
    }

    .btn-lg {
        font-size: 0.6rem;
        padding: 0.5rem 1rem;
    }

    /* 카드 */
    .card h3,
    .card h4 {
        font-size: 0.6rem;
    }

    .card {
        padding: 0.75rem;
    }

    /* 폼 요소 */
    label {
        font-size: 0.5rem;
    }

    input,
    select,
    textarea {
        font-size: 0.5rem;
        padding: 0.3rem;
    }

    /* 테이블 */
    table {
        font-size: 0.5rem;
    }

    th,
    td {
        padding: 0.4rem;
    }

    /* 시트 스타일 */
    .sheet-table th,
    .sheet-table td {
        font-size: 0.45rem;
        padding: 0.25rem;
    }

    .sheet-cell-input,
    .sheet-cell-select,
    .sheet-cell-textarea {
        font-size: 0.45rem;
        padding: 0.2rem;
    }

    /* 모달 */
    .modal-content {
        font-size: 0.5rem;
        padding: 1rem;
    }

    .modal-header h3 {
        font-size: 0.65rem;
    }

    /* 통계 카드 */
    .stats-grid .stat-card .label {
        font-size: 0.5rem;
    }

    .stats-grid .stat-card .value {
        font-size: 0.8rem;
    }

    /* 차트 영역 */
    .chart-section h3 {
        font-size: 0.6rem;
    }

    /* 성적표 */
    .report-preview {
        font-size: 0.5rem;
    }

    .report-header h2 {
        font-size: 0.8rem;
    }

    .report-header h3 {
        font-size: 0.6rem;
    }

    /* 오답 노트 */
    .wrong-note-preview {
        font-size: 0.5rem;
    }

    .wrong-question-item {
        font-size: 0.5rem;
    }

    /* 문제 상세 */
    .question-number {
        font-size: 0.625rem;
    }

    .question-meta {
        font-size: 0.4375rem;
    }

    /* 여백 조정 */
    .container {
        padding: 0.5rem;
    }

    /* 빈 상태 */
    .empty-state {
        font-size: 0.5rem;
        padding: 1.5rem;
    }

    .empty-state-icon {
        font-size: 1.5rem;
    }

    /* 차트 크기 축소 (성적표, 오답 노트) */
    #report canvas,
    #wrong-note canvas {
        max-width: 100% !important;
        height: auto !important;
    }

    /* 차트 컨테이너 크기 조정 */
    .trend-chart,
    .domain-chart,
    .trend-scores canvas,
    .domain-stats canvas {
        max-width: 100% !important;
        height: auto !important;
    }

    /* 차트 섹션 여백 축소 */
    .charts-section,
    .trend-chart-section,
    .domain-stats-section {
        margin-bottom: 1rem;
        padding: 0.5rem;
    }

    /* Canvas 요소 크기 제한 */
    canvas#trendChart,
    canvas#domainChart,
    canvas#wrongNoteTrendChart,
    canvas#wrongNoteDomainChart {
        width: 100% !important;
        max-width: 300px !important;
        height: auto !important;
        max-height: 120px !important;
    }

    /* 레이더 차트는 정사각형 유지 */
    canvas#domainChart,
    canvas#wrongNoteDomainChart {
        max-width: 200px !important;
        max-height: 200px !important;
    }
}