:root {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8edf2;
    --bg-hover: #f9fafb;
    
    --primary-500: #2563eb;
    --primary-600: #1d4ed8;
    --primary-700: #1e40af;
    
    --success-500: #10b981;
    --success-600: #059669;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --border-color: #e5e7eb;
    --border-hover: #d1d5db;
    
    --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);
    --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    font-size: 14px;
}

.bg-grid {
    display: none;
}

.bg-gradient {
    display: none;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.125rem;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: #ecfdf5;
    border: 1px solid #86efac;
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--success-600);
    font-weight: 500;
}

.status-dot {
    width: 6px;
    height: 6px;
    background: var(--success-500);
    border-radius: 50%;
}

.main-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.5rem;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.panel-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-title.small {
    font-size: 0.875rem;
}

.title-icon {
    font-size: 1.125rem;
}

.items-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 500px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.items-list::-webkit-scrollbar {
    width: 6px;
}

.items-list::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.items-list::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
}

.items-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.category-group {
    margin-bottom: 0.75rem;
}

.category-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    padding-left: 0.75rem;
}

.item-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.item-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.item-btn.active {
    background: #eff6ff;
    border-color: var(--primary-500);
    color: var(--primary-700);
}

.item-name {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.input-panel {
    background: var(--bg-secondary);
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.input-group input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 0.625rem 1rem;
    background: var(--primary-600);
    border: none;
    border-radius: 6px;
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--primary-700);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-icon {
    font-size: 1rem;
}

.main-panel {
    min-height: 600px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 600px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.welcome-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.welcome-screen h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.welcome-screen p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.results-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.results-panel.hidden {
    display: none;
}

.item-info-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.item-header h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.market-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.75rem;
}

.market-status.safe {
    background: #ecfdf5;
    border: 1px solid #86efac;
    color: var(--success-600);
}

.market-status.warning {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    color: var(--warning-600);
}

.market-status.danger {
    background: #fee2e2;
    border: 1px solid #fca5a5;
    color: var(--danger-600);
}

.status-icon {
    font-size: 0.875rem;
}

.item-params {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.param-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.param-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.param-value {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.result-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.result-card.highlight {
    background: #eff6ff;
    border-color: var(--primary-500);
}

.result-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.result-value {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.result-value.large {
    font-size: 2rem;
    color: var(--primary-600);
}

.result-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.result-meta span {
    color: var(--text-primary);
    font-weight: 600;
}

.charts-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.chart-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
}

.chart-container.full-width {
    grid-column: 1 / -1;
}

.chart-title {
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: 2;
    }
    
    .main-panel {
        order: 1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .logo-title {
        font-size: 1.8rem;
    }
    
    .item-params {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

.footer {
    margin-top: 2rem;
    padding: 1.5rem 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.beian-link {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.beian-link:hover {
    color: var(--primary-600);
    text-decoration: underline;
}