/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
}

body.dark-mode {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f1f5f9;
    --text-light: #94a3b8;
    --border-color: #334155;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* 头部 */
header {
    text-align: center;
    padding: 40px 0 20px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 导航 */
nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
    padding: 15px;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s;
}

nav a:hover {
    background: var(--primary-color);
    color: white;
}

nav a.active {
    background: var(--primary-color);
    color: white;
}

/* 概览卡片 */
.overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 搜索框 */
.search-section {
    margin: 30px 0;
}

.search-input {
    width: 100%;
    padding: 15px 20px;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-color);
    transition: border-color 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 筛选按钮 */
.filter-section {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 命令列表 */
.commands-section {
    margin: 30px 0;
}

.commands-section h2 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.commands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.command-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s;
    border-left: 4px solid var(--primary-color);
}

.command-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.command-card.new {
    border-left-color: var(--success-color);
}

.command-card.review {
    border-left-color: var(--warning-color);
}

.command-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.command-name {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.command-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.badge-new {
    background: var(--success-color);
    color: white;
}

.badge-review {
    background: var(--warning-color);
    color: white;
}

.badge-mastered {
    background: var(--primary-color);
    color: white;
}

.command-description {
    color: var(--text-color);
    margin-bottom: 15px;
    line-height: 1.5;
}

.command-example {
    background: var(--bg-color);
    padding: 12px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 10px;
    overflow-x: auto;
}

.command-output {
    background: var(--bg-color);
    padding: 12px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--text-light);
    border-left: 3px solid var(--secondary-color);
}

.command-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.command-category {
    font-size: 0.85rem;
    color: var(--text-light);
}

.command-mastery {
    display: flex;
    align-items: center;
    gap: 5px;
}

.mastery-stars {
    color: var(--warning-color);
}

/* 按钮 */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 考试设置 */
.exam-setup {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.exam-setup h2 {
    margin-bottom: 20px;
}

.setup-form {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.setup-form label {
    font-weight: bold;
    color: var(--text-color);
}

.setup-form select {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
}

/* 考试区域 */
.exam-area {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.exam-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.question-card {
    margin: 20px 0;
}

.question-card h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-color);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-item {
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.option-item:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.option-item.selected {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.option-item.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.option-item.wrong {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.option-radio {
    width: 20px;
    height: 20px;
    accent-color: var(--primary-color);
}

.exam-actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

/* 反馈 */
.feedback {
    margin-top: 20px;
    padding: 20px;
    border-radius: 10px;
    background: var(--bg-color);
}

.feedback.correct {
    border-left: 4px solid var(--success-color);
}

.feedback.wrong {
    border-left: 4px solid var(--danger-color);
}

#feedbackIcon {
    font-size: 2rem;
    margin-bottom: 10px;
}

#feedbackText {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 10px;
}

#feedbackExplanation {
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.6;
}

/* 考试结果 */
.exam-result {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    text-align: center;
}

.result-summary {
    margin: 30px 0;
}

.result-score {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
}

.result-percentage {
    font-size: 2rem;
    color: var(--text-light);
    margin-top: 10px;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.result-item {
    padding: 20px;
    background: var(--bg-color);
    border-radius: 10px;
}

.result-label {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.result-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--text-color);
}

.result-value.correct {
    color: var(--success-color);
}

.result-value.wrong {
    color: var(--danger-color);
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

/* 错题本 */
.wrong-book {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    margin: 30px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.wrong-book h2 {
    margin-bottom: 20px;
}

.wrong-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.wrong-item {
    padding: 15px;
    border: 2px solid var(--danger-color);
    border-radius: 10px;
    background: rgba(239, 68, 68, 0.05);
}

.wrong-question {
    font-weight: bold;
    margin-bottom: 10px;
}

.wrong-answer {
    color: var(--danger-color);
    margin-bottom: 5px;
}

.wrong-correct {
    color: var(--success-color);
}

/* 底部 */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

/* 响应式 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .overview {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .commands-grid {
        grid-template-columns: 1fr;
    }
    
    .result-stats {
        grid-template-columns: 1fr;
    }
    
    nav {
        flex-direction: column;
    }
    
    .setup-form {
        flex-direction: column;
        align-items: stretch;
    }
}

/* 暗黑模式切换 */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px 15px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    z-index: 1000;
}