/* analytics-tab.css - 홈 화면 학습 분석 탭 스타일 (미니멀 & 프리미엄) */

/* 대시보드 그리드 레이아웃 */
.analytics-dashboard-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 10px 0 40px;
}

/* 1. 요약 통계 카드 (Overview Stats) */
.stats-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.stats-card.stat-item {
    background: white;
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    text-align: center;
    border: 1px solid #f0f0f0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stats-card.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.stats-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--penguin-navy);
    margin-bottom: 4px;
}

.stats-label {
    font-size: 0.85rem;
    color: #868e96;
    font-weight: 500;
}

/* 2. 섹션 공통 스타일 */
.analytics-section {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    /* 부드러운 그림자 */
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--penguin-navy);
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title::before {
    content: '';
    display: block;
    width: 4px;
    height: 16px;
    background: var(--aqua-accent);
    border-radius: 2px;
}

/* 3. 차트 영역 */
.chart-container {
    position: relative;
    height: 240px;
    width: 100%;
}

/* 4. 취약 문제 & 복습 추천 카드 리스트 */
.recommendation-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.question-card {
    background: var(--glass-bg, rgba(255,255,255,0.7));
    backdrop-filter: var(--glass-blur, blur(12px));
    -webkit-backdrop-filter: var(--glass-blur, blur(12px));
    border: 1px solid var(--glass-border, rgba(255,255,255,0.3));
    border-radius: var(--radius-premium, 16px);
    padding: 16px;
    transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.question-card:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--penguin-skyblue);
    box-shadow: var(--shadow-lg, 0 12px 32px rgba(0,0,0,0.1));
}

.question-card.priority-high {
    background: var(--glass-bg, rgba(255,255,255,0.7));
}

.question-card.priority-high:hover {
    background: rgba(255, 255, 255, 0.9);
}

.q-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.8rem;
    color: #adb5bd;
}

.q-title {
    font-weight: 600;
    color: var(--penguin-navy);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.q-badges {
    display: flex;
    gap: 6px;
}

.q-badge {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.badge-wrong {
    background: #ff6b6b;
    color: white;
}

.badge-review {
    background: #51cf66;
    color: white;
}

/* 5. 데이터 없음 상태 (Empty State) */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #adb5bd;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-text {
    font-size: 1rem;
    margin-bottom: 20px;
}

.btn-cta {
    display: inline-block;
    padding: 10px 24px;
    background: var(--penguin-navy);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, background-color 0.2s;
}

.btn-cta:hover {
    background: #142036;
    transform: translateY(-2px);
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .stats-summary-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .analytics-section {
        padding: 20px;
    }

    .recommendation-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-summary-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .stats-card.stat-item {
        padding: 12px 10px;
    }

    .stats-value {
        font-size: 1.25rem;
    }

    .stats-label {
        font-size: 0.78rem;
    }

    .analytics-section {
        padding: 16px;
    }

    .chart-container {
        height: 200px;
    }
}