/* ========== 基础样式 ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Arial', system-ui, -apple-system, sans-serif;
        }
        body {
            background-color: #ffffff;
            color: #1e293b;
            line-height: 1.5;
            overflow-x: hidden;
        }
        /* 背景装饰 */
        .bg-lines, .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
            overflow: hidden;
        }
        .line {
            position: absolute;
            background: linear-gradient(90deg, transparent, rgba(0, 123, 255, 0.05), transparent);
            width: 1px;
            height: 100%;
            animation: lineMove 15s linear infinite;
        }
        @keyframes lineMove {
            0% { transform: translateY(-100%); }
            100% { transform: translateY(100%); }
        }
        .particle {
            position: absolute;
            background: rgba(0, 123, 255, 0.08);
            border-radius: 50%;
            animation: particleFloat 20s infinite linear;
        }
        @keyframes particleFloat {
            0% { transform: translateY(0) rotate(0deg); opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { transform: translateY(-100vh) rotate(360deg); opacity: 0; }
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 16px 12px;
            width: 100%;
        }
        /* 头部区域 */
        .config-header {
            padding: 28px 16px;
            text-align: center;
            background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
            border-radius: 28px;
            margin-bottom: 24px;
            border: 1px solid #e2e8f0;
            box-shadow: 0 8px 20px rgba(0, 123, 255, 0.06);
        }
        .config-header h1 {
            font-size: 1.7rem;
            margin-bottom: 8px;
            font-weight: 800;
            background: linear-gradient(90deg, #007bff, #00c6ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.3;
        }
        .config-subtitle {
            font-size: 0.95rem;
            color: #475569;
            margin-bottom: 16px;
            font-weight: 500;
        }
        /* 步骤指示器 - 移动端换行，隐藏连接线 */
        .config-steps {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 8px 12px;
            margin: 16px 0 20px;
        }
        .step {
            display: flex;
            flex-direction: column;
            align-items: center;
            flex: 0 0 auto;
            min-width: 58px;
            position: relative;
        }
        .step-circle {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: #f1f5f9;
            border: 2px solid #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #94a3b8;
            margin-bottom: 6px;
            transition: all 0.2s ease;
            font-size: 1.1rem;
        }
        .step.active .step-circle {
            background: linear-gradient(135deg, #007bff, #00c6ff);
            border-color: #007bff;
            color: white;
            transform: scale(1.05);
            box-shadow: 0 4px 12px rgba(0, 123, 255, 0.2);
        }
        .step-label {
            font-size: 0.7rem;
            font-weight: 500;
            color: #64748b;
            white-space: nowrap;
        }
        .step.active .step-label {
            color: #007bff;
            font-weight: 600;
        }
        /* 隐藏桌面端的连接线 */
        .step-line {
            display: none;
        }
        /* 配置卡片区域 */
        .config-section {
            margin-bottom: 32px;
            display: none;
        }
        .config-section.active {
            display: block;
            animation: fadeIn 0.25s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(6px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .section-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f1f5f9;
            position: relative;
        }
        .section-header::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 60px;
            height: 2px;
            background: linear-gradient(90deg, #007bff, #00c6ff);
        }
        .section-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 14px;
            color: #007bff;
            font-size: 1.5rem;
            flex-shrink: 0;
        }
        .section-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: #0f172a;
        }
        .section-subtitle {
            color: #64748b;
            font-size: 0.8rem;
            margin-top: 2px;
        }
        /* 卡片网格 - 移动端单列 */
        .options-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 18px;
        }
        .option-card {
            background: white;
            border-radius: 20px;
            padding: 18px;
            border: 1.5px solid #e2e8f0;
            transition: all 0.2s ease;
            cursor: pointer;
            box-shadow: 0 2px 6px rgba(0,0,0,0.02);
            position: relative;
        }
        .option-card.selected {
            border-color: #007bff;
            background: linear-gradient(135deg, rgba(0,123,255,0.02), rgba(0,198,255,0.02));
            box-shadow: 0 6px 14px rgba(0,123,255,0.1);
        }
        .option-card.selected::before {
            content: '✓';
            position: absolute;
            top: 14px;
            right: 14px;
            width: 26px;
            height: 26px;
            background: #007bff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 14px;
        }
        .option-header {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
        }
        .option-icon {
            width: 44px;
            height: 44px;
            background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 14px;
            color: #007bff;
            font-size: 1.3rem;
        }
        .option-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f172a;
        }
        .option-desc {
            color: #475569;
            font-size: 0.85rem;
            margin-bottom: 10px;
        }
        .option-specs {
            margin-top: 10px;
            padding-top: 8px;
            border-top: 1px solid #f1f5f9;
            font-size: 0.8rem;
        }
        .spec-item {
            display: flex;
            justify-content: space-between;
            padding: 4px 0;
            color: #475569;
        }
        .spec-value {
            font-weight: 600;
            color: #007bff;
        }
        /* 无线模块 */
        .wireless-options {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 12px;
        }
        .wireless-option {
            background: white;
            border-radius: 18px;
            padding: 12px;
            border: 1.5px solid #e2e8f0;
            cursor: pointer;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            transition: all 0.2s;
        }
        .wireless-option.selected {
            border-color: #007bff;
            background: rgba(0,123,255,0.03);
        }
        .wireless-icon {
            font-size: 1.8rem;
            color: #5b6e8c;
            margin-bottom: 4px;
        }
        .wireless-title {
            font-weight: 600;
            font-size: 1rem;
        }
        .wireless-desc {
            font-size: 0.7rem;
            color: #5b6e8c;
        }
        /* 导航按钮 */
        .config-nav {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid #eef2f8;
        }
        .nav-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: linear-gradient(135deg, #007bff, #00c6ff);
            color: white;
            border: none;
            padding: 14px 20px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            width: 100%;
            transition: 0.2s;
        }
        .nav-btn.prev {
            background: #f1f5f9;
            color: #1e293b;
            box-shadow: none;
        }
        .nav-btn:disabled {
            background: #cbd5e1;
            cursor: not-allowed;
            opacity: 0.7;
        }
        /* 结果区域 - 默认隐藏 */
        .result-section {
            display: none;
            background: white;
            border-radius: 28px;
            padding: 24px 16px;
            margin-top: 24px;
            border: 1px solid #e2e8f0;
            box-shadow: 0 12px 30px rgba(0,0,0,0.05);
        }
        .result-section.active {
            display: block;
        }
        .result-title {
            font-size: 1.7rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 20px;
        }
        .final-model {
            background: linear-gradient(135deg, #f8fafc, #f1f5f9);
            border-radius: 24px;
            padding: 20px;
            text-align: center;
            margin: 20px 0;
            word-break: break-word;
        }
        .model-value {
            font-size: 1.35rem;
            font-weight: 800;
            color: #007bff;
            word-break: break-all;
        }
        .specs-summary {
            display: grid;
            grid-template-columns: 1fr;
            gap: 14px;
            margin-top: 24px;
        }
        .spec-summary-card {
            background: white;
            border-radius: 20px;
            padding: 16px;
            border: 1px solid #edf2f7;
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
        }
        .warning-box {
            background: #fff8e7;
            border-left: 4px solid #ffc107;
            padding: 12px;
            border-radius: 14px;
            margin: 16px 0;
            display: none;
        }
        .warning-box.active {
            display: block;
        }
        .warning-title {
            color: #ff9800;
            font-weight: 600;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        /* 平板及以上布局 */
        @media (min-width: 640px) {
            .container { padding: 20px 24px; }
            .options-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
            .wireless-options { flex-direction: row; flex-wrap: wrap; }
            .wireless-option { flex: 1 1 160px; }
            .config-nav { flex-direction: row; }
            .nav-btn { width: auto; padding: 12px 28px; }
            .specs-summary { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
            .step-circle { width: 48px; height: 48px; font-size: 1.2rem; }
            .step-label { font-size: 0.75rem; white-space: normal; }
        }
        @media (min-width: 768px) {
            .config-header h1 { font-size: 2.2rem; }
        }
        button { touch-action: manipulation; }
        .fas, .far, .fab { font-style: normal; }