:root {
    --primary: #2563eb;
    --success: #16a34a;
    --warning: #f59e0b;
    --danger: #dc2626;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 16px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

.score-input-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.score-input-bar label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 1rem;
}

#scoreInput {
    width: 120px;
    padding: 10px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    transition: border-color 0.2s;
}

#scoreInput:focus {
    outline: none;
    border-color: var(--primary);
}

.primary-btn {
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-btn:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

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

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

.score-status.error {
    color: var(--danger);
}

.school-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.school-selector label {
    font-weight: 500;
    color: var(--text-secondary);
}

.school-selector select {
    padding: 8px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    background: white;
    cursor: pointer;
}

.school-selector select:focus {
    outline: none;
    border-color: var(--primary);
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.tab-btn {
    flex: 1;
    min-width: 120px;
    padding: 12px 20px;
    border: none;
    background: var(--card-bg);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
    white-space: nowrap;
}

.tab-btn:hover {
    background: #f1f5f9;
    transform: translateY(-2px);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.desc {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.chart-container {
    position: relative;
    height: 400px;
    margin-bottom: 24px;
}

.radar-container {
    height: 350px;
}

.risk-container {
    height: 300px;
}

.legend {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.color-chong { width: 16px; height: 16px; background: #ef4444; border-radius: 4px; }
.color-wen { width: 16px; height: 16px; background: #f59e0b; border-radius: 4px; }
.color-bao { width: 16px; height: 16px; background: #22c55e; border-radius: 4px; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.stat-item {
    background: var(--bg);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.trend-up {
    color: var(--success);
}

.compare-table {
    margin-top: 24px;
    overflow-x: auto;
}

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

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    font-size: 0.95rem;
}

.diff-positive {
    color: var(--success);
    font-weight: 600;
}

.diff-negative {
    color: var(--danger);
    font-weight: 600;
}

.risk-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.risk-item {
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    color: white;
}

.risk-item.high { background: var(--danger); }
.risk-item.medium-high { background: #f97316; }
.risk-item.medium { background: var(--warning); }
.risk-item.low { background: var(--success); }

.risk-label {
    display: block;
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 4px;
}

.risk-count {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
}

.eval-score {
    display: flex;
    justify-content: center;
    margin: 32px 0;
}

.score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

.score-value {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
}

.score-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-top: 4px;
}

.eval-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.eval-layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 32px;
    align-items: center;
    margin-bottom: 32px;
}

.eval-chart-container {
    position: relative;
    height: 200px;
}

@media (max-width: 768px) {
    .eval-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .eval-chart-container {
        height: 250px;
    }
}

.eval-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg);
    border-radius: 12px;
}

.eval-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.eval-status {
    font-weight: 600;
    font-size: 0.95rem;
}

.eval-status.fail {
    color: var(--danger);
}

.eval-status.warning {
    color: var(--warning);
}

.eval-suggestion {
    color: var(--text-secondary);
    font-size: 0.9rem;
    max-width: 60%;
    text-align: right;
}

footer {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    header {
        padding: 24px 16px;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .card {
        padding: 20px;
    }

    .tabs {
        gap: 6px;
    }

    .tab-btn {
        padding: 10px 14px;
        font-size: 0.9rem;
    }

    .chart-container {
        height: 300px;
    }

    .eval-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .eval-suggestion {
        max-width: 100%;
        text-align: left;
    }
}

/* 移动端推荐图表优化 */
@media (max-width: 768px) {
    .chart-container {
        height: 500px;
        overflow-y: auto;
    }
    
    .recommend-chart-container {
        height: 500px;
    }
}