/* 全局样式 */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
}

/* 导航栏 */
.navbar {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo svg {
    color: var(--primary-color);
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    padding: 0.625rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

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

/* 主内容区 */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

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

/* 搜索区域 */
.search-section {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    font-size: 1rem;
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.filter-tags {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filter-tag {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.filter-tag:hover {
    background: var(--primary-light);
    color: white;
}

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

/* 故障网格 */
.fault-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.fault-card {
    background: var(--bg-primary);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.fault-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.fault-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.fault-code {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--primary-color);
    color: white;
    border-radius: 0.5rem;
    font-weight: 700;
    font-size: 1.125rem;
}

.fault-card.critical .fault-code {
    background: var(--danger-color);
}

.fault-card.warning .fault-code {
    background: var(--warning-color);
}

.fault-card.sensor .fault-code {
    background: var(--success-color);
}

.severity-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.severity-badge.critical {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.severity-badge.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.severity-badge.sensor {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.fault-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.fault-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* 无结果提示 */
.no-results {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.no-results svg {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: 1rem;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.fault-code-header {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.fault-code-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: 0.75rem;
    font-weight: 700;
    font-size: 1.5rem;
}

.close-btn {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--danger-color);
    color: white;
}

.modal-body {
    padding: 2rem;
}

.fault-detail-section {
    margin-bottom: 2rem;
}

.fault-detail-section:last-child {
    margin-bottom: 0;
}

.fault-detail-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.fault-detail-section h3::before {
    content: '';
    width: 4px;
    height: 1.25rem;
    background: var(--primary-color);
    border-radius: 2px;
}

.fault-detail-section p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.fault-detail-section ul {
    list-style: none;
    padding-left: 0;
}

.fault-detail-section ul li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.fault-detail-section ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.solution-steps {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.solution-step {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    border-left: 3px solid var(--primary-color);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    color: var(--text-secondary);
}

.step-content strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .main-content {
        padding: 1rem;
    }

    .search-section {
        padding: 1.5rem;
    }

    .fault-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-header,
    .modal-body {
        padding: 1.5rem;
    }
}

/* 滚动条样式 */
.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}