@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

/* Reset & Variables */
:root {
    --primary: #FF6B35;
    --primary-hover: #E85A24;
    --secondary: #2A3B5C;
    --secondary-light: #EBF1FA;
    --accent: #00A8CC;
    --success: #2EC4B6;
    --success-light: #E8F8F5;
    --danger: #E05353;
    --danger-light: #FCECEC;
    --bg-light: #F7FAFC;
    --card-bg: #FFFFFF;
    --text-main: #2D3748;
    --text-muted: #718096;
    --border-color: #E2E8F0;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.12);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Pretendard', 'Noto Sans KR', sans-serif;
    font-size: 1.15rem;
    background-color: var(--bg-light);
    color: var(--text-main);
    line-height: 1.9;
    overflow-x: hidden;
}

/* App Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.app-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.brand-icon {
    font-size: 2.2rem;
    color: var(--primary);
    filter: drop-shadow(0 2px 5px rgba(255, 107, 53, 0.2));
}

.brand-text h1 {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--secondary);
    line-height: 1.1;
}

.brand-text span {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.app-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    color: var(--primary);
    background-color: var(--secondary-light);
}

.nav-btn.active {
    color: var(--primary);
    background-color: var(--secondary-light);
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--bg-light);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
}

.user-badge i {
    color: var(--primary);
}

.app-main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.app-footer {
    background-color: var(--secondary);
    color: white;
    text-align: center;
    padding: 2.5rem 1.5rem;
    margin-top: 4rem;
}

.app-footer p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.app-footer .info-text {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    opacity: 0.6;
}

/* Tab Animation Content */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}

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

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

/* Cards & Styling Utilities */
.card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.btn {
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}
.btn-secondary:hover {
    background-color: #1e2c47;
    transform: translateY(-2px);
}

.btn-success {
    background-color: var(--success);
    color: white;
}
.btn-success:hover {
    background-color: #24b0a3;
    transform: translateY(-2px);
}

.btn-outline {
    background: none;
    border: 2px solid var(--border-color);
    color: var(--text-main);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-outline-danger {
    background: none;
    border: 2px solid var(--danger);
    color: var(--danger);
}
.btn-outline-danger:hover {
    background-color: var(--danger);
    color: white;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.15rem;
}

.btn-block {
    width: 100%;
}

.btn-xs {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    background: none;
    border-radius: 4px;
}
.btn-xs.active {
    background-color: var(--secondary);
    color: white;
    border-color: var(--secondary);
}

/* SECTION 1: LOBBY UI */
.hero-section {
    background: linear-gradient(135deg, var(--secondary) 0%, #1e2b45 100%);
    border-radius: var(--radius);
    padding: 3rem;
    color: white;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2rem;
    align-items: center;
    box-shadow: var(--shadow-hover);
    margin-bottom: 2rem;
}

.hero-text .badge {
    background-color: rgba(255, 107, 53, 0.2);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.hero-text h2 {
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 1.5rem;
}

.hero-text .highlight {
    color: var(--primary);
}

.hero-text p {
    font-size: 1.05rem;
    opacity: 0.85;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.fireman-avatar {
    width: 180px;
    height: 180px;
    background-color: rgba(255, 255, 255, 0.08);
    border: 3px dashed rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    animation: float 4s ease-in-out infinite;
}

.safety-helmet {
    font-size: 6rem;
    color: var(--primary);
}

.shield {
    position: absolute;
    bottom: 5px;
    right: 5px;
    width: 50px;
    height: 50px;
    background-color: var(--accent);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.profile-card-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.profile-setup-card h3, .status-dashboard-card h3 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.profile-setup-card h3 i {
    color: var(--primary);
}

.status-dashboard-card h3 i {
    color: var(--accent);
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.profile-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.75rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--secondary);
}

.form-group input, .form-group select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.stat-item {
    background-color: var(--secondary-light);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 900;
    color: var(--secondary);
    margin-top: 0.2rem;
}

.recent-records h4 {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 0.8rem;
}

.records-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 120px;
    overflow-y: auto;
}

.records-list li {
    padding: 0.5rem 0.8rem;
    background-color: var(--bg-light);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 3px solid var(--primary);
}

.records-list li.record-item-fail {
    border-left-color: var(--danger);
}

.records-list li.record-item-pass {
    border-left-color: var(--success);
}

.records-list li .date {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.empty-list {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
    padding: 1.5rem;
}

/* SECTION 2: CONCEPT STUDY UI */
.study-layout {
    display: grid;
    grid-template-columns: 0.85fr 2.15fr;
    gap: 1.5rem;
}

.study-sidebar {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    height: calc(100vh - 160px);
    overflow-y: auto;
    position: sticky;
    top: 90px;
}

.study-sidebar h3 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.chapter-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.chapter-item {
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 3px solid transparent;
}

.chapter-item:hover {
    background-color: var(--bg-light);
    color: var(--primary);
}

.chapter-item.active {
    background-color: var(--secondary-light);
    color: var(--primary);
    border-left-color: var(--primary);
}

.chapter-item.read::after {
    content: "\f058";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    color: var(--success);
    font-size: 0.95rem;
}

.study-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.chapter-header-card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chapter-info .chapter-badge {
    background-color: var(--secondary-light);
    color: var(--secondary);
    font-size: 0.8rem;
    font-weight: 800;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
}

.chapter-info h2 {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--secondary);
    margin-top: 0.5rem;
}

.concept-contents {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.concept-card {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.concept-card-title {
    background-color: var(--secondary-light);
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.concept-card-title i {
    color: var(--primary);
}

.concept-card-body {
    padding: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

.concept-card-body p {
    margin-bottom: 1rem;
}

.concept-card-body p:last-child {
    margin-bottom: 0;
}

/* Highlight important keywords */
.keyword-highlight {
    background-color: #fff3cd;
    border-bottom: 2px solid #ffc107;
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    font-weight: 700;
    cursor: help;
    position: relative;
}

.keyword-highlight:hover {
    background-color: #ffe8a1;
}

/* SECTION 3: QUIZ SYSTEM UI */
.quiz-setup-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-setup-card-main h2 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.quiz-setup-card-main h2 i {
    color: var(--primary);
}

.setup-group {
    margin-bottom: 2.5rem;
}

.setup-label {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 1rem;
    display: block;
}

.option-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.option-tiles.flex-2 {
    grid-template-columns: 1fr 1fr;
}

.tile {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.tile i {
    font-size: 2rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.tile strong {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--secondary);
}

.tile span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tile:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.tile.active {
    border-color: var(--primary);
    background-color: var(--secondary-light);
    box-shadow: var(--shadow-hover);
}

.tile.active i {
    color: var(--primary);
}

.range-options {
    margin-bottom: 0.8rem;
    display: flex;
    gap: 0.4rem;
}

.chapter-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.6rem;
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    background-color: var(--bg-light);
}

.chapter-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.chapter-checkbox-label:hover {
    background-color: white;
}

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

/* Active Gameplay UI */
.quiz-gameplay-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quiz-header {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow);
}

.quiz-info-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.quiz-progress-text {
    font-size: 1.05rem;
    color: var(--secondary);
}

.quiz-timer {
    font-size: 1.05rem;
    color: var(--primary);
    font-family: 'Outfit', sans-serif;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 50px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: 50px;
    transition: width 0.4s ease;
}

.question-card {
    position: relative;
    overflow: hidden;
}

.question-part-origin {
    position: absolute;
    top: 0;
    left: 0;
    background-color: var(--secondary);
    color: white;
    font-size: 0.75rem;
    font-weight: 800;
    padding: 0.4rem 1rem;
    border-bottom-right-radius: var(--radius-sm);
}

.question-text {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--secondary);
    margin-top: 1.5rem;
    margin-bottom: 2rem;
    line-height: 1.45;
}

.quiz-options-list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.option-btn {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    padding: 1.2rem 1.5rem;
    border-radius: var(--radius-sm);
    text-align: left;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.option-btn .num-badge {
    width: 28px;
    height: 28px;
    background-color: var(--bg-light);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--secondary);
    transition: var(--transition);
}

.option-btn:hover {
    border-color: var(--secondary);
    background-color: var(--secondary-light);
    transform: scale(1.01);
}

.option-btn:hover .num-badge {
    background-color: var(--secondary);
    color: white;
}

/* Practice Mode Correct/Incorrect feedback classes */
.option-btn.correct {
    border-color: var(--success);
    background-color: var(--success-light);
}

.option-btn.correct .num-badge {
    background-color: var(--success);
    color: white;
}

.option-btn.incorrect {
    border-color: var(--danger);
    background-color: var(--danger-light);
}

.option-btn.incorrect .num-badge {
    background-color: var(--danger);
    color: white;
}

.option-btn.disabled {
    pointer-events: none;
    opacity: 0.7;
}

/* 복수정답 문항 - 고른 보기 표시 및 제출 버튼 */
.option-btn.selected {
    border-color: var(--secondary);
    background-color: var(--secondary-light);
}

.option-btn.selected .num-badge {
    background-color: var(--secondary);
    color: white;
}

.option-btn.selected::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-left: auto;
    color: var(--secondary);
}

.multi-answer-notice {
    display: block;
    width: fit-content;
    margin-bottom: 0.7rem;
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    background-color: var(--secondary-light);
    color: var(--secondary);
    font-size: 0.85rem;
    font-weight: 800;
}

.btn-confirm-answer {
    margin-top: 0.7rem;
    align-self: flex-end;
}

.btn-confirm-answer:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

/* Practice Feedback Panel */
.feedback-card {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.feedback-status {
    font-size: 1.25rem;
    font-weight: 900;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feedback-card.correct-feedback {
    border-left: 8px solid var(--success);
    background-color: var(--success-light);
}
.feedback-card.correct-feedback .feedback-status {
    color: var(--success);
}

.feedback-card.incorrect-feedback {
    border-left: 8px solid var(--danger);
    background-color: var(--danger-light);
}
.feedback-card.incorrect-feedback .feedback-status {
    color: var(--danger);
}

.feedback-explanation {
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.quiz-footer-actions {
    display: flex;
    justify-content: flex-end;
}

/* SECTION 3.3 RESULTS SCREEN UI */
.quiz-results-container {
    max-width: 700px;
    margin: 0 auto;
}

.results-summary-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 2rem;
}

.medal-icon {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background-color: #fff3cd;
    color: #ffc107;
    font-size: 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 8px 20px rgba(255, 193, 7, 0.2);
    margin-bottom: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

.results-summary-card h2 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.score-display {
    margin: 1rem 0;
}

.score-num {
    font-family: 'Outfit', sans-serif;
    font-size: 4.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.score-total {
    font-size: 1.3rem;
    color: var(--text-muted);
    font-weight: 700;
}

.stats-row {
    display: flex;
    gap: 2rem;
    margin: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    width: 100%;
    justify-content: center;
}

.sub-stat {
    font-size: 0.95rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.sub-stat strong {
    font-family: 'Outfit', sans-serif;
    color: var(--secondary);
    font-size: 1.15rem;
}

/* Submission to Google Sheet Area */
.teacher-submit-panel {
    background-color: var(--bg-light);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 1.5rem 0 2rem 0;
    width: 100%;
    text-align: left;
}

.teacher-submit-panel h3 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 0.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.teacher-submit-panel h3 i {
    color: var(--success);
}

.teacher-submit-panel p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1.2rem;
}

.submit-action-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: white;
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    gap: 1rem;
}

.submit-profile-info {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
}

.submit-msg {
    margin-top: 0.8rem;
    font-size: 0.9rem;
    font-weight: 700;
    text-align: center;
}

.submit-msg.success {
    color: var(--success);
}
.submit-msg.error {
    color: var(--danger);
}

.results-actions {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.results-actions button {
    flex: 1;
}

/* SECTION 4: RECORDS & O-NOTE UI */
.wrong-questions-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-top: 1.5rem;
}

.wrong-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    background-color: var(--bg-light);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: var(--transition);
}

.wrong-item:hover {
    border-color: var(--danger);
}

.wrong-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
}

.wrong-meta .origin {
    background-color: var(--danger-light);
    color: var(--danger);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.wrong-question-text {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--secondary);
}

.wrong-choices {
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.choice-line {
    display: flex;
    gap: 0.5rem;
}

.choice-line.wrong-pick {
    color: var(--danger);
    font-weight: 700;
}

.choice-line.correct-pick {
    color: var(--success);
    font-weight: 700;
}

.wrong-explanation-box {
    background-color: white;
    padding: 1rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
    font-size: 0.85rem;
}

.wrong-actions-area {
    display: flex;
    justify-content: flex-end;
}

.btn-goto-concept {
    font-size: 0.8rem;
    background-color: var(--secondary-light);
    color: var(--secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.btn-goto-concept:hover {
    background-color: var(--secondary);
    color: white;
    border-color: var(--secondary);
}

/* Loading Spinner */
.loading-state {
    text-align: center;
    padding: 3rem;
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 700;
}

.loading-state i {
    color: var(--primary);
    margin-right: 0.5rem;
}

/* Responsive Sidebar layout for smaller screens */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .hero-section {
        grid-template-columns: 1fr;
        padding: 2rem;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .fireman-avatar {
        width: 120px;
        height: 120px;
    }
    
    .safety-helmet {
        font-size: 4rem;
    }
    
    .profile-card-container {
        grid-template-columns: 1fr;
    }
    
    .study-layout {
        grid-template-columns: 1fr;
    }
    
    .study-sidebar {
        height: 200px;
        position: static;
    }
    
    .stats-row {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }
    
    .results-actions {
        flex-direction: column;
    }
}

/* Concept Details Formatting & Images */
/* 단원 한 줄 요약 */
.concept-summary {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    padding: 1rem 1.3rem;
    margin-bottom: 1.5rem;
    border-radius: var(--radius-sm);
    background-color: var(--secondary-light);
    color: var(--secondary);
    font-size: 1.02rem;
    font-weight: 600;
    line-height: 1.7;
}

.concept-summary i {
    color: var(--primary);
    margin-top: 0.25rem;
}

.concept-block {
    margin-bottom: 1.4rem;
}

/* 이미지 - 설명과 함께 보여줍니다 */
.concept-image-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: center;
}

.concept-figure {
    flex: 0 1 220px;
    margin: 0;
    text-align: center;
}

.concept-figure img {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    background-color: #fff;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.concept-figure img:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.concept-figure figcaption {
    margin-top: 0.5rem;
    font-size: 0.88rem;
    line-height: 1.5;
    color: var(--text-sub, #6b7280);
}

/* 용어 정의 */
.concept-term {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.9rem 1.2rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-sm);
    background-color: #fff;
    border: 2px dashed var(--border-color);
}

.concept-term .term-name {
    flex-shrink: 0;
    padding: 0.15rem 0.7rem;
    border-radius: 999px;
    background-color: var(--secondary);
    color: #fff;
    font-weight: 800;
    font-size: 0.95rem;
}

.concept-term .term-text {
    flex: 1 1 240px;
    font-size: 1.02rem;
    line-height: 1.75;
}

/* 꼭 외울 것 */
.concept-keypoints {
    padding: 1.2rem 1.4rem;
    margin-bottom: 1.4rem;
    border-radius: var(--radius-sm);
    background-color: #FFF8E7;
    border: 2px solid #FFD87A;
}

.concept-keypoints .keypoints-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.7rem;
    font-weight: 800;
    font-size: 1.05rem;
    color: #8A5A00;
}

.concept-keypoints ul {
    margin: 0;
    padding-left: 1.3rem;
}

.concept-keypoints li {
    font-size: 1.02rem;
    line-height: 1.8;
    margin-bottom: 0.4rem;
    list-style-type: disc;
}

/* 안내 상자 */
.concept-callout {
    padding: 1.1rem 1.3rem;
    margin-bottom: 1.3rem;
    border-radius: var(--radius-sm);
    font-size: 1.02rem;
    line-height: 1.75;
    border-left: 5px solid;
}

.concept-callout .callout-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
    font-weight: 800;
}

.callout-info { background-color: var(--secondary-light); border-color: var(--secondary); }
.callout-info .callout-title { color: var(--secondary); }

.callout-tip { background-color: var(--success-light); border-color: var(--success); }
.callout-tip .callout-title { color: #1a7f74; }

.callout-warning { background-color: #FFF4E5; border-color: #F0932B; }
.callout-warning .callout-title { color: #A65C00; }

.callout-danger { background-color: var(--danger-light); border-color: var(--danger); }
.callout-danger .callout-title { color: #9b2c2c; }

/* 표 */
.concept-table-scroll {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.concept-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.98rem;
    background-color: #fff;
}

.concept-table th {
    padding: 0.8rem 1rem;
    background-color: var(--secondary);
    color: #fff;
    font-weight: 700;
    text-align: left;
    white-space: nowrap;
}

.concept-table td {
    padding: 0.8rem 1rem;
    border-top: 1px solid var(--border-color);
    line-height: 1.7;
    vertical-align: top;
}

.concept-table tbody tr:nth-child(even) {
    background-color: #FAFBFD;
}

/* 순서가 있는 과정 */
.concept-steps {
    counter-reset: step;
    list-style: none;
    margin: 0;
    padding: 0;
}

.concept-steps li {
    position: relative;
    padding: 0 0 1rem 2.8rem;
    border-left: 2px solid var(--border-color);
    margin-left: 0.9rem;
}

.concept-steps li:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}

.concept-steps li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: -0.95rem;
    top: 0;
    width: 1.9rem;
    height: 1.9rem;
    border-radius: 50%;
    background-color: var(--primary);
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.concept-steps .step-title {
    display: block;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 0.2rem;
}

.concept-steps .step-text {
    display: block;
    font-size: 1rem;
    line-height: 1.75;
}

/* 사이드바 단원명 */
.chapter-item .chapter-num {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
}

.chapter-item .chapter-name {
    font-weight: 600;
}

.concept-list {
    margin-left: 1.5rem;
    margin-bottom: 1.2rem;
    padding-left: 0.5rem;
}

.concept-list li {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 0.6rem;
    color: var(--text-main);
    position: relative;
    list-style-type: disc;
}

.concept-paragraph {
    font-size: 1.08rem;
    line-height: 1.85;
    margin-bottom: 1.2rem;
    color: var(--text-main);
    text-align: justify;
}

.concept-sub-heading {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    margin-top: 1.8rem;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-alert {
    padding: 1.2rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.2rem;
    font-size: 1rem;
    line-height: 1.7;
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.info-alert i {
    font-size: 1.2rem;
    margin-top: 0.2rem;
}

.warning-box {
    background-color: var(--danger-light);
    border-left: 5px solid var(--danger);
    color: #9b2c2c;
}

.warning-box i {
    color: var(--danger);
}

/* 하이라이트 및 강조 클래스 추가 */
.text-emphasis {
    color: var(--primary-hover);
    font-weight: 800;
}

.keyword-highlight {
    background: linear-gradient(104deg, rgba(255, 235, 100, 1) 0%, rgba(255, 235, 100, 0.4) 100%);
    padding: 0 0.3em;
    border-radius: 4px;
    font-weight: 700;
    color: var(--secondary);
    box-shadow: inset 0 -4px 0 rgba(255, 107, 53, 0.2);
}

/* ==========================================
   결과 화면 - 문제 다시 보기
   ========================================== */
.results-review-card {
    margin-top: 1.5rem;
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-top: 1.2rem;
}

.review-item {
    padding: 1.2rem 1.4rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--border-color);
    background-color: #fff;
}

.review-item.is-correct { border-left-color: var(--success); }
.review-item.is-wrong { border-left-color: var(--danger); }

.review-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.6rem;
}

.review-no {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    color: var(--secondary);
}

.review-mark { font-weight: 800; font-size: 0.95rem; }
.is-correct .review-mark { color: var(--success); }
.is-wrong .review-mark { color: var(--danger); }

.review-question {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.6;
    color: var(--secondary);
    margin-bottom: 0.9rem;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 0.9rem;
}

.review-option {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.98rem;
    line-height: 1.6;
    background-color: #F8F9FB;
}

.review-option.opt-correct {
    background-color: var(--success-light);
    font-weight: 700;
}

.review-option.opt-picked-wrong {
    background-color: var(--danger-light);
}

.review-option .opt-num {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background-color: #fff;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Outfit', sans-serif;
    font-size: 0.8rem;
    font-weight: 700;
}

.review-option .opt-text { flex: 1; }

.opt-tag {
    flex-shrink: 0;
    padding: 0.1rem 0.55rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
    color: #fff;
}

.tag-answer { background-color: var(--success); }
.tag-mine { background-color: var(--danger); }

.review-skipped {
    margin-bottom: 0.8rem;
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--danger);
}

.review-explanation {
    padding: 0.9rem 1.1rem;
    border-radius: var(--radius-sm);
    background-color: var(--secondary-light);
    font-size: 0.98rem;
    line-height: 1.75;
}

.review-explanation strong {
    display: inline-block;
    margin-right: 0.4rem;
    color: var(--secondary);
}

.review-source {
    margin-top: 0.7rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}