/* ========== 完整保留原始样式 (仅适配 BL233) ========== */
        * { 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; }
        
        #step4RecommendResult { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin-top: 18px; }