/* 기본 초기화 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Malgun Gothic', 'Apple SD Gothic Neo', sans-serif;
}

body {
    background-color: #f1f5f9;
    color: #1e293b;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.bebras-app {
    max-width: 780px;
    width: 100%;
}

/* 헤더 디자인 및 교사용 토글 */
.app-header {
    margin-bottom: 20px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.app-header h1 {
    font-size: 1.8rem;
    color: #0f172a;
}

.subtitle {
    font-size: 0.95rem;
    color: #64748b;
    margin-top: 4px;
    margin-bottom: 20px;
}

/* 교사용 스위치 스타일 */
.teacher-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #cbd5e1;
    padding: 6px 12px;
    border-radius: 20px;
}

.switch-label {
    font-size: 0.85rem;
    font-weight: bold;
    color: #334155;
    cursor: pointer;
}

.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

.switch input { display: none; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #94a3b8;
    transition: .3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px; width: 16px;
    left: 3px; bottom: 3px;
    background-color: white;
    transition: .3s;
}

input:checked + .slider { background-color: #0ea5e9; }
input:checked + .slider:before { transform: translateX(18px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

/* 난이도 선택 탭 */
.tab-container {
    display: flex;
    gap: 8px;
    background: #e2e8f0;
    padding: 5px;
    border-radius: 12px;
}

.tab-btn {
    flex: 1;
    border: none;
    padding: 10px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: bold;
    cursor: pointer;
    background: transparent;
    color: #475569;
    transition: all 0.2s;
}

.tab-btn.active {
    background: white;
    color: #0f172a;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

/* 교사용 대시보드 패널 */
.teacher-dashboard {
    background: #f0fdfa;
    border: 2px dashed #0d9488;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    color: #115e59;
}

.teacher-dashboard h3 {
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.teacher-grid {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.teacher-card {
    flex: 1;
    background: white;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #99f6e4;
    font-size: 0.88rem;
}

.t-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    color: white;
    margin-bottom: 5px;
}

.b-easy { background: #10b981; }
.b-medium { background: #f59e0b; }
.b-hard { background: #8b5cf6; }

.teacher-tip {
    font-size: 0.85rem;
    background: #ccfbf1;
    padding: 8px;
    border-radius: 6px;
}

/* 메인 퀴즈 카드 */
.quiz-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    padding: 25px;
    margin-bottom: 20px;
    border-top: 6px solid #3b82f6;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    color: white;
}

/* 동적 일러스트 구역 */
.quiz-image-zone {
    display: flex;
    justify-content: center;
    background: #f8fafc;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
    border: 1px dashed #cbd5e1;
}

.story-box {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #334155;
    margin-bottom: 15px;
}

/* 시뮬레이터 교구 */
.coin-info-box {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 15px;
}

.info-item {
    background: #f1f5f9;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: bold;
}

.apple-box-wrapper {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.apple-box-item {
    flex: 1;
    background: #fffdf0;
    border: 2px solid #fbbf24;
    border-radius: 8px;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.apple-box-item.checked {
    background: #fef08a;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(251,191,36,0.2);
}

.live-counter {
    background: #fef3c7;
    color: #b45309;
    text-align: center;
    padding: 8px;
    border-radius: 6px;
    font-weight: bold;
}

/* 질문과 보기 */
.question-box {
    background: #f0f7ff;
    padding: 12px;
    border-radius: 8px;
    color: #1d4ed8;
    font-weight: bold;
    margin-bottom: 15px;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.option-card {
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 12px 15px;
    cursor: pointer;
    transition: all 0.2s;
    background: white;
}

.option-card:hover { background: #f8fafc; }
.option-card.selected {
    border-color: #3b82f6;
    background-color: #eff6ff;
    color: #1d4ed8;
    font-weight: bold;
}

#submit-answer-btn {
    width: 100%;
    background: #1e293b;
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
}

#submit-answer-btn:hover { background: #0f172a; }

/* 결과 패널 */
.feedback-panel {
    border-radius: 12px;
    padding: 20px;
    line-height: 1.6;
}

.feedback-panel.correct { background: #ecfdf5; border: 2px solid #a7f3d0; color: #065f46; }
.feedback-panel.incorrect { background: #fef2f2; border: 2px solid #fca5a5; color: #991b1b; }
.feedback-header { font-size: 1.15rem; font-weight: bold; margin-bottom: 10px; }
.feedback-content h4 { margin-top: 12px; border-bottom: 1px solid rgba(0,0,0,0.08); padding-bottom: 4px; }
.feedback-content ul, .feedback-content ol { margin-left: 20px; margin-top: 4px; font-size: 0.9rem; }

.hidden { display: none !important; }