/* ---------- 原有全部样式，完整保留 ---------- */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Arial', sans-serif;
        }
        body {
            background-color: #ffffff;
            color: #333333;
            line-height: 1.6;
            overflow-x: hidden;
            position: relative;
        }
        .fas, .far, .fab, .fa-solid, .fa-regular, .fa-brands {
            font-style: normal !important;
        }
        .step-circle i,
        .section-icon i, 
        .option-icon i,
        .wireless-icon i,
        .nav-btn i {
            font-style: normal !important;
            transform: none !important;
        }
        .bg-lines {
            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%); }
        }
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
        }
        .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: 20px;
        }
        .config-header {
            position: relative;
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
            border-radius: 20px;
            margin-bottom: 40px;
            overflow: hidden;
            border: 1px solid #e2e8f0;
            box-shadow: 0 10px 40px rgba(0, 123, 255, 0.08);
        }
        .config-header h1 {
            font-size: 3rem;
            margin-bottom: 15px;
            font-weight: 800;
            background: linear-gradient(90deg, #007bff, #00c6ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            position: relative;
            z-index: 1;
            text-shadow: 0 0 20px rgba(0, 123, 255, 0.1);
        }
        .config-subtitle {
            font-size: 1.3rem;
            color: #64748b;
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
            font-weight: 500;
        }
        .config-steps {
            display: flex;
            justify-content: center;
            margin: 40px 0 60px;
            position: relative;
        }
        .step {
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            margin: 0 30px;
            text-align: center;
        }
        .step-circle {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #f1f5f9;
            border: 3px solid #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #94a3b8;
            margin-bottom: 15px;
            transition: all 0.3s ease;
            position: relative;
            z-index: 2;
        }
        .step.active .step-circle {
            background: linear-gradient(135deg, #007bff, #00c6ff);
            border-color: #007bff;
            color: white;
            transform: scale(1.1);
            box-shadow: 0 5px 15px rgba(0, 123, 255, 0.2);
        }
        .step-line {
            position: absolute;
            top: 25px;
            width: 60px;
            height: 3px;
            background: #e2e8f0;
            z-index: 1;
        }
        .step-line.left {
            left: -60px;
            transform: translateX(-50%);
        }
        .step-line.right {
            right: -60px;
            transform: translateX(50%);
        }
        .step.active .step-line {
            background: linear-gradient(90deg, #007bff, #00c6ff);
        }
        .step-label {
            font-size: 0.9rem;
            color: #64748b;
            font-weight: 500;
        }
        .step.active .step-label {
            color: #007bff;
            font-weight: 600;
        }
        .config-section {
            margin-bottom: 40px;
            position: relative;
            display: none;
        }
        .config-section.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .section-header {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f1f5f9;
            position: relative;
        }
        .section-header::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 80px;
            height: 2px;
            background: linear-gradient(90deg, #007bff, #00c6ff);
        }
        .section-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 20px;
            color: #007bff;
            font-size: 1.8rem;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }
        .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: #1e293b;
        }
        .section-subtitle {
            color: #64748b;
            font-size: 1rem;
            margin-top: 5px;
        }
        .options-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 25px;
        }
        .option-card {
            background: white;
            border-radius: 16px;
            padding: 25px;
            border: 2px solid #e2e8f0;
            transition: all 0.4s ease;
            position: relative;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
            cursor: pointer;
        }
        .option-card:hover {
            transform: translateY(-5px);
            border-color: #cbd5e1;
            box-shadow: 0 15px 30px rgba(0, 123, 255, 0.1);
        }
        .option-card.selected {
            border-color: #007bff;
            background: linear-gradient(135deg, rgba(0, 123, 255, 0.03), rgba(0, 198, 255, 0.03));
            box-shadow: 0 15px 30px rgba(0, 123, 255, 0.15);
        }
        .option-card.selected::before {
            content: '✓';
            position: absolute;
            top: 15px;
            right: 15px;
            width: 30px;
            height: 30px;
            background: #007bff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }
        .option-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        .option-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: #007bff;
            font-size: 1.5rem;
            transition: all 0.3s ease;
            flex-shrink: 0;
        }
        .option-card.selected .option-icon {
            background: linear-gradient(135deg, #007bff, #00c6ff);
            color: white;
        }
        .option-title {
            font-size: 1.3rem;
            font-weight: 600;
            color: #1e293b;
        }
        .option-card.selected .option-title {
            color: #007bff;
        }
        .option-desc {
            color: #475569;
            line-height: 1.6;
            font-size: 0.95rem;
        }
        .option-specs {
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #f1f5f9;
        }
        .spec-item {
            display: flex;
            justify-content: space-between;
            padding: 5px 0;
            color: #64748b;
            font-size: 0.9rem;
        }
        .spec-value {
            font-weight: 600;
            color: #007bff;
        }
        .wireless-options {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .wireless-option {
            flex: 1 1 180px;
            background: white;
            border-radius: 12px;
            padding: 20px;
            border: 2px solid #e2e8f0;
            transition: all 0.3s ease;
            cursor: pointer;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .wireless-option:hover {
            border-color: #cbd5e1;
            transform: translateY(-3px);
        }
        .wireless-option.selected {
            border-color: #007bff;
            background: linear-gradient(135deg, rgba(0, 123, 255, 0.03), rgba(0, 198, 255, 0.03));
        }
        .wireless-icon {
            font-size: 2rem;
            color: #94a3b8;
            margin-bottom: 10px;
        }
        .wireless-option.selected .wireless-icon {
            color: #007bff;
        }
        .wireless-title {
            font-weight: 600;
            color: #1e293b;
            margin-bottom: 5px;
        }
        .wireless-desc {
            color: #64748b;
            font-size: 0.9rem;
        }
        .sub-options-section {
            margin-top: 40px;
        }
        .sub-title {
            font-size: 1.4rem;
            font-weight: 600;
            color: #1e293b;
            margin-bottom: 20px;
        }
        .motion-options {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .motion-option {
            flex: 1 1 150px;
            background: white;
            border-radius: 12px;
            padding: 15px;
            border: 2px solid #e2e8f0;
            cursor: pointer;
            text-align: center;
            transition: all 0.3s ease;
        }
        .motion-option:hover {
            border-color: #007bff;
        }
        .motion-option.selected {
            border-color: #007bff;
            background: rgba(0,123,255,0.03);
        }
        .config-nav {
            display: flex;
            justify-content: space-between;
            margin-top: 50px;
            padding-top: 30px;
            border-top: 1px solid #f1f5f9;
        }
        .nav-btn {
            display: flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, #007bff, #00c6ff);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 123, 255, 0.2);
        }
        .nav-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 123, 255, 0.3);
        }
        .nav-btn:disabled {
            background: #cbd5e1;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        .nav-btn.prev {
            background: #f1f5f9;
            color: #64748b;
        }
        .nav-btn.prev:hover:not(:disabled) {
            background: #e2e8f0;
            transform: translateY(-3px);
        }
        .result-section {
            background: white;
            border-radius: 20px;
            padding: 40px;
            margin-top: 50px;
            border: 1px solid #e2e8f0;
            box-shadow: 0 10px 40px rgba(0, 123, 255, 0.08);
            display: none;
            animation: fadeIn 0.5s ease;
        }
        .result-section.active {
            display: block;
        }
        .result-title {
            font-size: 2rem;
            font-weight: 700;
            color: #1e293b;
            margin-bottom: 20px;
            text-align: center;
        }
        .final-model {
            background: linear-gradient(135deg, #f8fafc, #f1f5f9);
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            margin: 30px 0;
            border: 2px solid #e2e8f0;
        }
        .model-label {
            font-size: 1rem;
            color: #64748b;
            margin-bottom: 10px;
        }
        .model-value {
            font-size: 2.5rem;
            font-weight: 800;
            color: #007bff;
            word-break: break-all;
        }
        .specs-summary {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }
        .spec-summary-card {
            background: white;
            border-radius: 12px;
            padding: 20px;
            border: 1px solid #f1f5f9;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.02);
        }
        .spec-summary-title {
            font-weight: 600;
            color: #007bff;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }
        .spec-summary-value {
            color: #1e293b;
            font-size: 1.2rem;
            font-weight: 600;
        }
        .spec-summary-desc {
            color: #64748b;
            font-size: 0.9rem;
            margin-top: 5px;
        }
        .warning-box {
            background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 235, 59, 0.05));
            border: 1px solid #ffc107;
            border-radius: 12px;
            padding: 20px;
            margin-top: 30px;
            display: none;
        }
        .warning-box.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        .warning-title {
            color: #ff9800;
            font-weight: 600;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .warning-text {
            color: #ff9800;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .config-header h1 { font-size: 2.2rem; }
            .config-subtitle { font-size: 1.1rem; }
            .options-grid { grid-template-columns: 1fr; }
            .wireless-options { flex-direction: column; }
            .specs-summary { grid-template-columns: 1fr; }
            .step { margin: 0 15px; }
            .step-line { width: 30px; }
            .step-line.left { left: -30px; }
            .step-line.right { right: -30px; }
        }

        /* N板选择样式 */
        .n-board-row {
            display: flex;
            gap: 10px;
            align-items: center;
            margin-bottom: 15px;
            background: #f8fafc;
            padding: 15px;
            border-radius: 12px;
            border: 1px solid #e2e8f0;
        }
        .n-board-select {
            flex: 1;
            padding: 10px;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            background: white;
        }
        .n-board-select:focus {
            border-color: #007bff;
            outline: none;
        }
        .remove-board-btn {
            background: none;
            border: none;
            color: #dc3545;
            font-size: 1.5rem;
            cursor: pointer;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .remove-board-btn:hover {
            background: #f1f5f9;
        }
        .add-board-btn {
            background: white;
            border: 2px dashed #007bff;
            color: #007bff;
            padding: 12px 20px;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s;
            margin-top: 10px;
        }
        .add-board-btn:hover {
            background: #e7f1ff;
            border-style: solid;
        }

        /* IO推荐区域 */
        .io-recommend-section {
            margin-top: 40px;
            padding: 25px;
            background: #f9fbfd;
            border-radius: 16px;
            border: 1px solid #dde7f0;
        }
        .io-input-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px,1fr));
            gap: 15px;
            margin: 20px 0;
        }
        .io-input-field label {
            font-weight: 500;
            color: #1e293b;
        }
        .io-input-field input, .io-input-field select {
            width: 100%;
            padding: 8px;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            margin-top: 4px;
            background: white;
        }
        .rec-actions {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .rec-card-small {
            background: white;
            border-radius: 12px;
            padding: 15px;
            border: 2px solid #e2e8f0;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            cursor: pointer;
            transition: 0.2s;
            min-width: 180px;
        }
        .rec-card-small:hover {
            border-color: #007bff;
            transform: translateY(-2px);
        }
        .rec-card-small .rec-title {
            font-size: 1.3rem;
            font-weight: 700;
            color: #007bff;
        }
        .rec-card-small .rec-desc {
            font-size: 0.9rem;
            color: #475569;
            margin: 8px 0;
        }
        .apply-btn {
            background: #007bff;
            color: white;
            border: none;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            cursor: pointer;
            margin-top: 8px;
        }
        .apply-btn:hover {
            background: #0056b3;
        }