* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif; background: #ffffff; color: #1a2c3e; line-height: 1.5; overflow-x: hidden; }
        
        /* 修复所有图标容器的字体样式，防止图标变形 */
        .fas, .far, .fab, .fa-solid, .fa-regular, .fa-brands, i[class*="fa-"] {
            font-family: "Font Awesome 6 Free", "Font Awesome 6 Brands", sans-serif !important;
            font-weight: 400;
            font-style: normal;
            -webkit-font-smoothing: antialiased;
            display: inline-block;
            line-height: 1;
        }
        .fa-solid, .fas { font-weight: 900 !important; }
        .fa-brands { font-family: "Font Awesome 6 Brands" !important; }
        
        .bg-lines, .particles { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: -1; }
        .line { position: absolute; background: linear-gradient(90deg, transparent, rgba(0,123,255,0.04), 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(0,123,255,0.06); 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; border: 1px solid #eef2f8; box-shadow: 0 10px 40px rgba(0,123,255,0.06); }
        .config-header h1 { font-size: 3rem; margin-bottom: 15px; font-weight: 800; background: linear-gradient(90deg, #1e6fdf, #00c6ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .config-subtitle { font-size: 1.2rem; color: #5a6e7c; margin-bottom: 30px; font-weight: 500; }
        
        /* 步骤指示器 - 修复横线遮挡文字的问题 */
        .config-steps { display: flex; justify-content: center; margin: 40px 0 60px; flex-wrap: wrap; gap: 20px; position: relative; }
        .step { display: flex; flex-direction: column; align-items: center; position: relative; z-index: 2; background: transparent; }
        .step-circle { 
            width: 52px; height: 52px; border-radius: 50%; background: #f1f5f9; border: 3px solid #e2e8f0; 
            display: flex; align-items: center; justify-content: center; font-weight: 700; color: #94a3b8; 
            margin-bottom: 12px; transition: all 0.3s; font-size: 1.3rem; position: relative; z-index: 3;
        }
        .step.active .step-circle { background: linear-gradient(135deg, #1e6fdf, #00c6ff); border-color: #1e6fdf; color: white; transform: scale(1.05); box-shadow: 0 5px 15px rgba(30,111,223,0.2); }
        .step-label { font-size: 0.85rem; color: #64748b; font-weight: 500; text-align: center; }
        .step.active .step-label { color: #1e6fdf; font-weight: 600; }
        
        /* 横线使用伪元素，避免覆盖数字 */
        .step:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 26px;
            left: calc(100% + 10px);
            width: 60px;
            height: 2px;
            background: linear-gradient(90deg, #e2e8f0, #e2e8f0);
            z-index: 1;
        }
        .step.active:not(:last-child)::after {
            background: linear-gradient(90deg, #1e6fdf, #00c6ff);
        }
        .step:last-child::after { display: none; }
        
        @media (max-width: 768px) {
            .step:not(:last-child)::after { width: 30px; left: calc(100% + 6px); top: 26px; }
            .config-steps { gap: 12px; }
            .step-circle { width: 44px; height: 44px; font-size: 1.1rem; margin-bottom: 8px; }
        }
        
        .config-section { margin-bottom: 40px; display: none; animation: fadeIn 0.4s ease; }
        .config-section.active { display: block; }
        @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, #1e6fdf, #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: #1e6fdf; 
            font-size: 1.8rem; flex-shrink: 0; 
        }
        .section-icon i { font-size: 1.8rem; width: auto; height: auto; }
        .section-title { font-size: 1.8rem; font-weight: 700; color: #0a2540; }
        .section-subtitle { color: #5a6e7c; 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 #eef2f8; transition: all 0.3s ease; cursor: pointer; position: relative; box-shadow: 0 5px 15px rgba(0,0,0,0.02); }
        .option-card:hover { transform: translateY(-5px); border-color: #c5d5e8; box-shadow: 0 15px 30px rgba(30,111,223,0.08); }
        .option-card.selected { border-color: #1e6fdf; background: linear-gradient(135deg, rgba(30,111,223,0.02), rgba(0,198,255,0.02)); box-shadow: 0 15px 30px rgba(30,111,223,0.1); }
        .option-card.selected::before { content: '✓'; position: absolute; top: 15px; right: 15px; width: 28px; height: 28px; background: #1e6fdf; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-weight: bold; font-size: 0.9rem; }
        .option-card.disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; background: #f8fafc; filter: grayscale(0.05); }
        .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: #1e6fdf; 
            flex-shrink: 0;
        }
        .option-icon i { font-size: 1.5rem; width: auto; height: auto; }
        .option-card.selected .option-icon { background: linear-gradient(135deg, #1e6fdf, #00c6ff); color: white; }
        .option-title { font-size: 1.3rem; font-weight: 600; color: #0a2540; }
        .option-desc { color: #475569; line-height: 1.6; font-size: 0.9rem; }
        .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: #5a6e7c; font-size: 0.85rem; }
        .spec-value { font-weight: 600; color: #1e6fdf; }
        .wireless-options { display: flex; gap: 20px; margin-top: 20px; flex-wrap: wrap; }
        .wireless-option { flex: 1; min-width: 180px; background: white; border-radius: 12px; padding: 20px; border: 2px solid #eef2f8; transition: all 0.3s; cursor: pointer; text-align: center; }
        .wireless-option:hover { border-color: #c5d5e8; transform: translateY(-3px); }
        .wireless-option.selected { border-color: #1e6fdf; background: linear-gradient(135deg, rgba(30,111,223,0.02), rgba(0,198,255,0.02)); }
        .wireless-icon { font-size: 2rem; color: #94a3b8; margin-bottom: 10px; }
        .wireless-option.selected .wireless-icon { color: #1e6fdf; }
        .wireless-title { font-weight: 600; color: #0a2540; margin-bottom: 5px; }
        .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, #1e6fdf, #00c6ff); color: white; border: none; padding: 14px 32px; border-radius: 12px; font-weight: 600; cursor: pointer; transition: all 0.3s; box-shadow: 0 5px 15px rgba(30,111,223,0.15); }
        .nav-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(30,111,223,0.25); }
        .nav-btn:disabled { background: #cbd5e1; cursor: not-allowed; transform: none; }
        .nav-btn.prev { background: #f1f5f9; color: #5a6e7c; box-shadow: none; }
        .nav-btn.prev:hover:not(:disabled) { background: #e2e8f0; }
        .result-section { background: white; border-radius: 20px; padding: 40px; margin-top: 50px; border: 1px solid #eef2f8; display: none; animation: fadeIn 0.5s; }
        .result-section.active { display: block; }
        .final-model { background: linear-gradient(135deg, #f8fafc, #f1f5f9); border-radius: 16px; padding: 30px; text-align: center; margin: 30px 0; border: 2px solid #eef2f8; }
        .model-value { 
            font-size: 1.8rem; 
            font-weight: 800; 
            color: #1e6fdf; 
            word-break: break-all; 
            font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Cascadia Code', monospace; 
            letter-spacing: 0.3px;
        }
        .specs-summary { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 20px; margin-top: 30px; }
        .spec-summary-card { background: white; border-radius: 12px; padding: 20px; border: 1px solid #eef2f8; }
        .warning-box { background: rgba(255,193,7,0.08); border: 1px solid #ffc107; border-radius: 12px; padding: 20px; margin: 20px 0; display: none; align-items: center; gap: 15px; }
        .warning-box.active { display: flex; animation: fadeIn 0.3s; }
        
        /* Y板选型区域样式 */
        .y-slot-section { margin-bottom: 40px; }
        .y-slot-header { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid #eef2f8; }
        .y-slot-header .slot-icon { width: 36px; height: 36px; background: #eef2ff; border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #1e6fdf; font-size: 1.1rem; }
        .y-slot-header .slot-title { font-size: 1.2rem; font-weight: 600; color: #0a2540; }
        .y-slot-header .slot-badge { font-size: 0.7rem; padding: 4px 12px; border-radius: 20px; background: #e6f7e6; color: #2e7d32; font-weight: 500; }
        .slot-2-section { margin-top: 40px; border-top: 2px dashed #cbd5e1; padding-top: 30px; }
        .info-tip { background: linear-gradient(135deg, #eef2ff, #f5f9ff); border-left: 4px solid #1e6fdf; padding: 14px 20px; border-radius: 12px; margin-bottom: 30px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
        .info-tip i { font-size: 1.2rem; color: #1e6fdf; }
        .info-tip span { color: #1e2c3e; font-size: 0.9rem; }
        .info-tip strong { color: #1e6fdf; }
        .scroll-hint { display: inline-block; background: #e8f0fe; border-radius: 20px; padding: 4px 12px; font-size: 0.7rem; color: #1e6fdf; margin-left: 12px; }
        
        @media (max-width: 768px) { 
            .config-header h1 { font-size: 2rem; } 
            .options-grid { grid-template-columns: 1fr; } 
            .step:not(:last-child)::after { width: 25px; left: calc(100% + 4px); top: 22px; }
            .step-circle { width: 40px; height: 40px; font-size: 1rem; }
            .info-tip { font-size: 0.85rem; }
            .section-icon, .option-icon { width: 48px; height: 48px; }
            .section-icon i, .option-icon i { font-size: 1.4rem; }
            .model-value { font-size: 1.2rem; }
            .scroll-hint { font-size: 0.6rem; margin-left: 6px; }
        }