:root {
    --primary: #4a90d9;
    --primary-dark: #357abd;
    --success: #4caf7d;
    --warning: #f5a623;
    --danger: #e74c3c;
    --info: #5dade2;
    --bg: #f0f2f5;
    --card-bg: #fff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #e1e5eb;
    --radius: 10px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

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

.container { max-width: 900px; margin: 0 auto; padding: 0 16px; }

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links { display: flex; gap: 8px; flex-wrap: wrap; }

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.2s;
}

.nav-links a:hover {
    background: var(--bg);
    color: var(--primary);
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin: 12px 0;
    font-size: 14px;
}

.alert-success { background: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; }
.alert-danger { background: #fbe9e7; color: #c62828; border: 1px solid #ffccbc; }
.alert-warning { background: #fff8e1; color: #f57f17; border: 1px solid #ffe082; }

/* Dashboard */
.dashboard { padding: 20px 0; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border-top: 3px solid var(--primary);
}

.stat-card.blue { border-top-color: var(--primary); }
.stat-card.green { border-top-color: var(--success); }
.stat-card.yellow { border-top-color: var(--warning); }
.stat-card.red { border-top-color: var(--danger); }

.stat-number { font-size: 32px; font-weight: 700; color: var(--text); }
.stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

.action-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    text-decoration: none;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; border-color: var(--success); }
.btn-warning { background: var(--warning); color: white; border-color: var(--warning); }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-info { background: var(--info); color: white; border-color: var(--info); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 12px 32px; font-size: 16px; }

/* Sections */
.section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.section h2 {
    font-size: 16px;
    margin-bottom: 12px;
    color: var(--text);
}

/* Error Card */
.error-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    margin-bottom: 10px;
    transition: all 0.2s;
    position: relative;
}

.error-card:hover { border-color: var(--primary); }
.error-card.resolved { opacity: 0.7; border-left: 3px solid var(--success); }

.error-text { font-size: 15px; font-weight: 500; margin-bottom: 6px; }
.error-options { font-size: 13px; color: var(--text-light); margin-bottom: 6px; }
.error-meta { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.error-answer { margin-top: 6px; font-size: 13px; }
.view-link { position: absolute; right: 16px; top: 50%; transform: translateY(-50%); color: var(--primary); text-decoration: none; font-size: 13px; }
.view-link:hover { text-decoration: underline; }

/* Tags */
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
}

.type-tag { background: #e3f2fd; color: #1565c0; }
.kp-tag { background: #f3e5f5; color: #7b1fa2; }
.reason-tag { /* inherits colors below */ }
.red-tag { background: #fbe9e7; color: #c62828; }
.yellow-tag { background: #fff8e1; color: #f57f17; }
.blue-tag { background: #e3f2fd; color: #1565c0; }
.gray-tag { background: #f5f5f5; color: #616161; }
.green-tag { background: #e8f5e9; color: #2e7d32; }

.date { font-size: 12px; color: var(--text-light); }
.wrong { color: var(--danger); font-weight: 500; }
.correct { color: var(--success); font-weight: 500; }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

.empty-state p { margin-bottom: 16px; }

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
}

.page-header h1 { font-size: 22px; }

.header-actions { display: flex; gap: 8px; align-items: center; }

/* Filter Bar */
.filter-bar {
    background: var(--card-bg);
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.filter-bar form { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.filter-bar select,
.filter-bar input[type="text"] {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    background: white;
}

.filter-bar input[type="text"] { flex: 1; min-width: 150px; }

/* Form */
.form {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-width: 700px;
}

.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea { resize: vertical; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

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

/* Detail Card */
.detail-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.detail-section { margin-bottom: 24px; }

.detail-section h3 {
    font-size: 14px;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.question-text { font-size: 17px; line-height: 1.7; }

.options-section .option {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 6px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.option-label {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg);
    font-weight: 700;
    font-size: 13px;
}

.correct-option { border-color: var(--success); background: #e8f5e9; }
.correct-option .option-label { background: var(--success); color: white; }
.wrong-option { border-color: var(--danger); background: #fbe9e7; }
.wrong-option .option-label { background: var(--danger); color: white; }

.answer-comparison {
    display: flex;
    gap: 20px;
}

.answer-box {
    text-align: center;
    padding: 16px 32px;
    border-radius: var(--radius);
    flex: 1;
}

.wrong-box { background: #fbe9e7; }
.correct-box { background: #e8f5e9; }
.answer-label { font-size: 13px; margin-bottom: 8px; }
.answer-value { font-size: 36px; font-weight: 700; }

.meta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; font-size: 14px; }
.note-text { background: #fff8e1; padding: 12px; border-radius: 6px; font-size: 14px; }

/* Practice */
.practice-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
}

.practice-number {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.practice-question { font-size: 16px; font-weight: 500; margin-bottom: 12px; }

.practice-options { display: flex; flex-direction: column; gap: 8px; }

.practice-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.practice-option:hover { border-color: var(--primary); background: #f8faff; }
.practice-option input[type="radio"] { margin: 0; }
.practice-option span { font-size: 14px; }

.practice-submit { text-align: center; margin: 20px 0; }

/* Result */
.result-summary { text-align: center; margin-bottom: 24px; }

.result-score {
    display: inline-block;
    padding: 24px 48px;
    border-radius: var(--radius);
}

.score-great { background: #e8f5e9; }
.score-good { background: #fff8e1; }
.score-poor { background: #fbe9e7; }

.score-number { font-size: 48px; font-weight: 700; }
.score-label { font-size: 16px; margin-top: 4px; }
.score-detail { margin-top: 12px; font-size: 15px; color: var(--text-light); }

.result-card {
    display: flex;
    gap: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 8px;
}

.result-correct { border-left: 3px solid var(--success); }
.result-wrong { border-left: 3px solid var(--danger); }

.result-icon { font-size: 20px; flex-shrink: 0; }
.result-body { flex: 1; }
.result-question { font-size: 14px; margin-bottom: 6px; }
.result-answers { font-size: 13px; margin-bottom: 4px; }
.result-kp { font-size: 12px; color: var(--text-light); }

/* Diagnosis */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.summary-card {
    background: var(--card-bg);
    text-align: center;
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.summary-label { font-size: 13px; color: var(--text-light); }
.summary-value { font-size: 28px; font-weight: 700; margin-top: 4px; }

.section-title-red { color: var(--danger); }
.section-title-yellow { color: var(--warning); }
.section-title-green { color: var(--success); }

.kp-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.kp-info { min-width: 180px; }
.kp-name { font-size: 14px; font-weight: 500; display: block; }
.kp-category { font-size: 12px; color: var(--text-light); }

.kp-bar-container {
    flex: 1;
    height: 10px;
    background: #eee;
    border-radius: 5px;
    overflow: hidden;
}

.kp-bar { height: 100%; border-radius: 5px; transition: width 0.5s; }

.kp-stats { min-width: 120px; font-size: 12px; color: var(--text-light); text-align: right; }

.reason-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.diagnosis-tip {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.diagnosis-tip h3 { font-size: 16px; margin-bottom: 10px; }
.diagnosis-tip ul { padding-left: 20px; }
.diagnosis-tip li { margin-bottom: 6px; font-size: 14px; }

/* Knowledge */
.knowledge-grid { display: flex; flex-direction: column; gap: 12px; }

.knowledge-category-header {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    padding: 12px 0 4px;
    border-bottom: 2px solid var(--primary);
}

.knowledge-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
}

.knowledge-name { font-size: 15px; font-weight: 500; }
.knowledge-meta { display: flex; gap: 10px; font-size: 12px; color: var(--text-light); margin-top: 2px; }

.knowledge-stats {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 8px;
}

.knowledge-bar-container {
    flex: 1;
    height: 8px;
    background: #eee;
    border-radius: 4px;
    overflow: hidden;
}

.knowledge-bar { height: 100%; border-radius: 4px; transition: width 0.5s; }
.knowledge-pct { font-size: 13px; font-weight: 600; min-width: 35px; text-align: right; }

.knowledge-links { margin-top: 8px; }

/* Responsive */
@media (max-width: 600px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .summary-cards { grid-template-columns: 1fr 1fr; }
    .action-buttons { flex-direction: column; }
    .form-row { grid-template-columns: 1fr; }
    .meta-grid { grid-template-columns: 1fr; }
    .answer-comparison { flex-direction: column; }
    .nav-links { display: none; }
    .kp-row { flex-direction: column; align-items: flex-start; }
    .kp-bar-container { width: 100%; }
    .view-link { position: static; transform: none; display: inline-block; margin-top: 8px; }
}