/* ===== 基础字号与全局 ===== */
        html {
            font-size: 18px; /* 基础字号调大，提升阅读舒适度 */
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --blue-primary: #1E6EF0;
            --blue-dark: #0f3f8c;
            --blue-light: #e9f0fe;
            --gradient-blue: linear-gradient(135deg, #1E6EF0, #3b82f6);
            --gray-soft: #f5f7fc;
            --text-dark: #0b2a3e;
            --text-muted: #4a627a;
            --radius-card: 1.2rem;
            --shadow-soft: 0 8px 30px rgba(30, 110, 240, 0.06);
            --shadow-hover: 0 12px 40px rgba(30, 110, 240, 0.10);
        }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f8faff;
            color: var(--text-dark);
            line-height: 1.8; /* 行高加大，更易读 */
            font-size: 1rem;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .container {
            max-width: 1320px; /* 放宽容器，减少边缘空旷感 */
            margin: 0 auto;
            padding: 0 2rem;
        }
        .btn-primary {
            display: inline-block;
            background: var(--gradient-blue);
            color: #fff;
            font-weight: 600;
            padding: 0.7rem 2.2rem;
            border-radius: 60px;
            border: none;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(30, 110, 240, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(30, 110, 240, 0.35);
        }
        .btn-primary-white {
            background: #fff;
            color: var(--blue-primary);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }
        .btn-primary-white:hover {
            background: rgba(255, 255, 255, 0.92);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
        }
        .btn-outline {
            display: inline-block;
            background: transparent;
            color: var(--blue-primary);
            font-weight: 600;
            padding: 0.7rem 2.2rem;
            border-radius: 60px;
            border: 2px solid var(--blue-primary);
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .btn-outline:hover {
            background: var(--blue-primary);
            color: #fff;
        }
        .section-title {
            font-size: 2.6rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
        }
        .section-sub {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 680px;
        }
        .badge-blue {
            display: inline-block;
            background: var(--blue-light);
            color: var(--blue-primary);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 0.25rem 1rem;
            border-radius: 40px;
            letter-spacing: 0.03em;
            margin-bottom: 0.6rem;
        }
/*         .page {
            display: none;
            animation: fadeIn 0.35s ease;
        } */
        .page.active {
            display: block;
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(14px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        @keyframes scaleIn {
            from {
                transform: scale(0.92);
                opacity: 0;
            }
            to {
                transform: scale(1);
                opacity: 1;
            }
        }

        /* ===== HEADER ===== */
        header {
            padding: 0.8rem 0;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(8px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid rgba(30, 110, 240, 0.06);
        }
        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-weight: 700;
            font-size: 1.4rem;
            color: var(--text-dark);
            cursor: pointer;
        }
        .logo img {
            height: 50px;
            width: auto;
            display: block;
        }
        .logo small {
            font-weight: 400;
            font-size: 0.7rem;
            color: var(--text-muted);
            margin-left: 0.3rem;
            background: var(--blue-light);
            padding: 0.05rem 0.6rem;
            border-radius: 40px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2.2rem;
            font-weight: 500;
            color: var(--text-muted);
            font-size: 1rem;
        }
        .nav-links a {
            cursor: pointer;
            transition: color 0.2s;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--blue-primary);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 4px;
            cursor: pointer;
            padding: 4px;
        }
        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 4px;
            transition: 0.2s;
        }

        /* ===== FOOTER ===== */
        footer {
            padding: 3rem 0 1.5rem;
            border-top: 1px solid rgba(30, 110, 240, 0.06);
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(30, 110, 240, 0.06);
        }
        .footer-grid h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.8rem;
        }
        .footer-grid ul {
            list-style: none;
            font-size: 0.95rem;
            color: var(--text-muted);
        }
        .footer-grid ul li {
            margin-bottom: 0.4rem;
            cursor: pointer;
            transition: color 0.2s;
        }
        .footer-grid ul li:hover {
            color: var(--blue-primary);
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-weight: 700;
            font-size: 1.2rem;
            color: var(--text-dark);
        }
        .footer-logo img {
            height: 48px;
            width: auto;
        }
        .footer-logo span {
            color: var(--blue-primary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            padding-top: 1.5rem;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .footer-bottom .links {
            display: flex;
            gap: 1.5rem;
        }
        .footer-bottom .links a {
            cursor: pointer;
            transition: color 0.2s;
        }
        .footer-bottom .links a:hover {
            color: var(--blue-primary);
        }

        /* ===== 模态框 ===== */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(4px);
            z-index: 9999;
            align-items: center;
            justify-content: center;
        }
        .modal-overlay.active {
            display: flex;
        }
        .modal-box {
            background: white;
            border-radius: 2rem;
            padding: 2.5rem 2.5rem 2rem;
            max-width: 440px;
            width: 90%;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
            position: relative;
            animation: scaleIn 0.25s ease;
        }
        .modal-box .close-btn {
            position: absolute;
            top: 0.8rem;
            right: 1.2rem;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--text-muted);
            background: none;
            border: none;
            line-height: 1;
            transition: color 0.2s;
        }
        .modal-box .close-btn:hover {
            color: var(--text-dark);
        }
        .modal-box .qr-placeholder {
            width: 180px;
            height: 180px;
            margin: 0 auto 0.8rem;
            background: var(--gray-soft);
            border-radius: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.8rem;
            border: 2px dashed rgba(30, 110, 240, 0.12);
            color: var(--blue-primary);
        }
        .modal-box h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.2rem;
        }
        .modal-box p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 0.5rem;
        }
        .modal-box .hint {
            font-size: 0.85rem;
            color: var(--text-muted);
            background: var(--gray-soft);
            padding: 0.3rem 1rem;
            border-radius: 40px;
            display: inline-block;
        }

        /* ============================================================ */
        /* ===== 首页 (Home) ===== */
        /* ============================================================ */
        .hero {
            padding: 4rem 0 2.5rem;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
            align-items: center;
        }
        .hero-left h1 {
            font-size: 3.6rem;
            font-weight: 700;
            line-height: 1.1;
            letter-spacing: -0.03em;
        }
        .hero-left h1 span {
            background: var(--gradient-blue);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-left p {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 480px;
            margin-bottom: 2rem;
        }
        .hero-stats {
            display: flex;
            gap: 3rem;
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(0, 0, 0, 0.04);
        }
        .hero-stats strong {
            display: block;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--blue-primary);
        }
        .hero-stats span {
            font-size: 0.95rem;
            color: var(--text-muted);
        }
        .hero-right {
            background: white;
            border-radius: 2rem;
            padding: 2.2rem;
            box-shadow: var(--shadow-soft);
            border: 1px solid rgba(30, 110, 240, 0.06);
        }
        .hero-right .preview-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            padding: 0.7rem 0;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            font-size: 0.95rem;
        }
        .hero-right .preview-item:last-child {
            border-bottom: none;
        }
        .hero-right .preview-item .icon {
            font-size: 1.4rem;
            width: 36px;
            text-align: center;
        }

        .platform-core {
            padding: 3.5rem 0;
        }
        .core-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }
        .core-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.25s ease;
        }
        .core-card:hover {
            border-color: rgba(30, 110, 240, 0.15);
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .core-card .icon {
            font-size: 2.2rem;
            margin-bottom: 0.4rem;
        }
        .core-card h4 {
            font-size: 1.15rem;
            font-weight: 600;
        }
        .core-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 0.2rem;
        }
        .core-card ul {
            margin-top: 0.4rem;
            padding-left: 1.2rem;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .core-card ul li {
            list-style: disc;
            margin-bottom: 0.1rem;
        }

        .home-hardware {
            padding: 3.5rem 0;
            background: white;
            border-radius: 2rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(30, 110, 240, 0.04);
        }
        .home-hardware .hardware-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
            align-items: center;
        }
        .home-hardware .hardware-card {
            background: var(--gray-soft);
            border-radius: 2rem;
            padding: 2.5rem;
            text-align: center;
            border: 1px solid rgba(30, 110, 240, 0.06);
            max-width: 400px;
            width: 100%;
        }
        .home-hardware .hardware-card .device-icon img {
            width: 90px;
            height: auto;
            margin-bottom: 0.5rem;
        }
        .home-hardware .hardware-card .spec-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.5rem;
            margin: 0.6rem 0;
        }
        .home-hardware .hardware-card .spec-tags span {
            background: white;
            padding: 0.15rem 0.8rem;
            border-radius: 40px;
            font-size: 0.75rem;
            color: var(--text-muted);
            font-weight: 500;
            border: 1px solid rgba(30, 110, 240, 0.06);
        }
        .home-hardware .hardware-right .tagline {
            color: var(--blue-primary);
            font-weight: 600;
            font-size: 1rem;
        }
        .home-hardware .hardware-right h2 {
            font-size: 2rem;
            font-weight: 700;
        }
        .home-hardware .hardware-right p {
            color: var(--text-muted);
            margin: 0.6rem 0 1rem;
            font-size: 1rem;
        }
        .home-hardware .hardware-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.4rem 1.2rem;
        }
        .home-hardware .hardware-features .item {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.95rem;
        }
        .home-hardware .hardware-features .item::before {
            content: '◆';
            color: var(--blue-primary);
            font-size: 0.5rem;
        }

        .cta-section {
            background: var(--gradient-blue);
            border-radius: 2rem;
            padding: 3rem 2rem;
            margin: 2.5rem 0;
            color: white;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }
        .cta-section p {
            opacity: 0.85;
            max-width: 540px;
            margin: 0 auto 1.5rem auto;
            font-size: 1.05rem;
        }

        /* ============================================================ */
        /* ===== 产品介绍页 (Product) ===== */
        /* ============================================================ */
        .product-hero {
            padding: 3.5rem 0 2rem;
        }
        .product-hero .product-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
            align-items: center;
        }
        .product-hero .product-left .tagline {
            font-size: 0.95rem;
            color: var(--blue-primary);
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 0.2rem;
        }
        .product-hero .product-left h1 {
            font-size: 3.2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.1;
        }
        .product-hero .product-left h1 span {
            color: var(--blue-primary);
        }
        .product-hero .product-left .sub {
            color: var(--text-muted);
            font-size: 1.15rem;
            margin: 0.3rem 0 0.8rem;
        }
        .product-hero .product-left .desc {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 520px;
            margin-bottom: 1.5rem;
        }
        .product-hero .product-specs-mini {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.3rem 1.5rem;
            margin: 0.8rem 0 1.5rem;
            background: var(--gray-soft);
            padding: 1rem 1.5rem;
            border-radius: 1rem;
        }
        .product-hero .product-specs-mini .spec-item {
            display: flex;
            justify-content: space-between;
            font-size: 0.9rem;
            padding: 0.3rem 0;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
        }
        .product-hero .product-specs-mini .spec-item .label {
            color: var(--text-muted);
        }
        .product-hero .product-specs-mini .spec-item .value {
            font-weight: 600;
        }
        .product-right .device-showcase {
            background: var(--gray-soft);
            border-radius: 2rem;
            padding: 2.5rem 2rem;
            text-align: center;
            border: 1px solid rgba(30, 110, 240, 0.06);
            max-width: 420px;
            width: 100%;
            margin: 0 auto;
        }
        .product-right .device-showcase .device-img {
            width: 130px;
            height: auto;
            margin-bottom: 0.5rem;
        }
        .product-right .device-showcase h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin: 0.3rem 0 0.2rem;
        }
        .product-right .device-showcase .price {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--blue-primary);
        }
        .product-right .device-showcase .price small {
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-muted);
        }
        .product-right .device-showcase .badge-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.4rem;
            margin: 0.6rem 0;
        }
        .product-right .device-showcase .badge-row span {
            background: white;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.75rem;
            border: 1px solid rgba(30, 110, 240, 0.08);
            color: var(--text-muted);
            font-weight: 500;
        }
        .product-right .device-showcase .highlight-tag {
            background: var(--blue-light);
            border-radius: 0.6rem;
            padding: 0.5rem;
            font-size: 0.8rem;
            color: var(--blue-primary);
            margin-top: 0.4rem;
        }

        /* 产品定位 */
        .product-position {
            padding: 2.5rem 0 1.5rem;
        }
        .position-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .position-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem 1.6rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.25s ease;
            text-align: center;
        }
        .position-card:hover {
            border-color: rgba(30, 110, 240, 0.15);
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }
        .position-card .icon {
            font-size: 2.4rem;
            margin-bottom: 0.3rem;
        }
        .position-card h4 {
            font-size: 1.15rem;
            font-weight: 600;
        }
        .position-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 0.2rem;
        }

        /* 核心卖点 */
        .product-core {
            padding: 2.5rem 0;
        }
        .core-features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .core-feature-item {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
            text-align: center;
        }
        .core-feature-item:hover {
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 110, 240, 0.12);
        }
        .core-feature-item .icon {
            font-size: 2.6rem;
            margin-bottom: 0.3rem;
        }
        .core-feature-item h4 {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .core-feature-item p {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 0.2rem;
        }
        .core-feature-item .highlight-badge {
            display: inline-block;
            background: var(--blue-primary);
            color: white;
            font-size: 0.65rem;
            font-weight: 600;
            padding: 0.15rem 0.7rem;
            border-radius: 40px;
            margin-top: 0.3rem;
        }

        /* 平台联动 */
        .product-platform {
            padding: 2.5rem 0;
            background: white;
            border-radius: 2rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(30, 110, 240, 0.04);
        }
        .platform-flow {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 2rem;
            align-items: center;
            margin-top: 1.5rem;
        }
        .platform-flow .col {
            background: var(--gray-soft);
            border-radius: 1.2rem;
            padding: 1.5rem 1.8rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
        }
        .platform-flow .col h5 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .platform-flow .col ul {
            list-style: none;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .platform-flow .col ul li {
            padding: 0.2rem 0;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .platform-flow .col ul li::before {
            content: '›';
            color: var(--blue-primary);
            font-weight: 700;
            font-size: 1.2rem;
        }
        .platform-flow .arrow {
            font-size: 2rem;
            color: var(--blue-primary);
            opacity: 0.6;
            font-weight: 300;
        }

        /* 完整功能模块 */
        .product-features {
            padding: 2.5rem 0;
        }
        .product-features .feature-block {
            margin-bottom: 2.5rem;
        }
        .product-features .feature-block h3 {
            font-size: 1.6rem;
            font-weight: 700;
            border-left: 5px solid var(--blue-primary);
            padding-left: 1rem;
            margin-bottom: 1.2rem;
        }
        .product-features .feature-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .product-features .feature-item {
            background: white;
            border-radius: 1rem;
            padding: 1.5rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
        }
        .product-features .feature-item:hover {
            border-color: rgba(30, 110, 240, 0.15);
            box-shadow: var(--shadow-soft);
        }
        .product-features .feature-item .icon {
            font-size: 1.8rem;
            margin-bottom: 0.2rem;
        }
        .product-features .feature-item h5 {
            font-size: 1.05rem;
            font-weight: 600;
        }
        .product-features .feature-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.1rem;
        }
        .product-features .feature-item .tag {
            display: inline-block;
            font-size: 0.65rem;
            background: var(--blue-light);
            color: var(--blue-primary);
            padding: 0.05rem 0.6rem;
            border-radius: 40px;
            margin-top: 0.2rem;
        }

        /* 交互设计 */
        .product-interaction {
            padding: 2.5rem 0;
            background: white;
            border-radius: 2rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(30, 110, 240, 0.04);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .interaction-card {
            background: var(--gray-soft);
            border-radius: 1rem;
            padding: 1.5rem 1.8rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
        }
        .interaction-card h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .interaction-card .key-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.2rem 0.8rem;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .interaction-card .key-row strong {
            color: var(--text-dark);
        }
        .interaction-card .note {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
            padding-top: 0.5rem;
            border-top: 1px solid rgba(0, 0, 0, 0.04);
        }
        .interaction-card .note .highlight {
            color: var(--blue-primary);
            font-weight: 600;
        }

        /* 关键参数 */
        .product-specs-light {
            padding: 2.5rem 0;
            background: white;
            border-radius: 2rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(30, 110, 240, 0.04);
        }
        .specs-light-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        .specs-light-grid .spec-item {
            text-align: center;
            padding: 1rem;
            background: var(--gray-soft);
            border-radius: 0.8rem;
        }
        .specs-light-grid .spec-item .number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--blue-primary);
        }
        .specs-light-grid .spec-item .label {
            font-size: 0.9rem;
            color: var(--text-muted);
            display: block;
            margin-top: 0.1rem;
        }

        /* ===== 帮助中心 ===== */
        .help-hero {
            padding: 3.5rem 0 1.5rem;
        }
        .help-hero h1 {
            font-size: 2.6rem;
            font-weight: 700;
        }
        .help-hero h1 span {
            color: var(--blue-primary);
        }
        .help-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            border-left: 5px solid var(--blue-primary);
            padding-left: 1rem;
        }
        .help-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .help-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem 2rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
        }
        .help-card:hover {
            border-color: rgba(30, 110, 240, 0.15);
            box-shadow: var(--shadow-soft);
        }
        .help-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .help-card h3 .icon {
            font-size: 1.6rem;
        }
        .help-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 0.3rem;
        }
        .help-card ul {
            padding-left: 1.2rem;
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .help-card ul li {
            list-style: disc;
            margin-bottom: 0.15rem;
        }
        .help-card .step-list {
            counter-reset: step;
            padding-left: 0;
        }
        .help-card .step-list li {
            list-style: none;
            counter-increment: step;
            padding: 0.3rem 0 0.3rem 2.2rem;
            position: relative;
            border-bottom: 1px solid rgba(0, 0, 0, 0.03);
        }
        .help-card .step-list li::before {
            content: counter(step);
            position: absolute;
            left: 0;
            top: 0.3rem;
            width: 1.6rem;
            height: 1.6rem;
            background: var(--blue-light);
            color: var(--blue-primary);
            border-radius: 50%;
            font-weight: 700;
            font-size: 0.8rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .faq-item {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.5rem 2rem;
            margin-bottom: 1rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
        }
        .faq-item:hover {
            border-color: rgba(30, 110, 240, 0.12);
        }
        .faq-item .question {
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .faq-item .question .q-icon {
            color: var(--blue-primary);
            font-weight: 700;
        }
        .faq-item .answer {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 0.3rem;
            padding-left: 1.8rem;
        }

        /* 语音指令大全 */
        .voice-commands {
            background: white;
            border-radius: var(--radius-card);
            padding: 2rem 2.2rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
        }
        .voice-commands .command-category {
            margin-bottom: 1.8rem;
        }
        .voice-commands .command-category h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--blue-primary);
            margin-bottom: 0.4rem;
            border-bottom: 1px solid var(--blue-light);
            padding-bottom: 0.2rem;
        }
        .voice-commands .command-category ul {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.2rem 1.5rem;
            list-style: none;
            padding-left: 0;
        }
        .voice-commands .command-category ul li {
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 0.15rem 0;
            display: flex;
            align-items: baseline;
            gap: 0.3rem;
        }
        .voice-commands .command-category ul li::before {
            content: '“';
            color: var(--blue-primary);
            font-weight: 300;
        }
        .voice-commands .command-category ul li::after {
            content: '”';
            color: var(--blue-primary);
            font-weight: 300;
        }
        .voice-commands .command-category ul li .cmd {
            font-weight: 500;
            color: var(--text-dark);
        }

        /* ===== 隐私政策 & 联系我们 ===== */
        .privacy-hero {
            padding: 3.5rem 0 1.5rem;
        }
        .privacy-hero h1 {
            font-size: 2.6rem;
            font-weight: 700;
        }
        .privacy-hero h1 span {
            color: var(--blue-primary);
        }
        .privacy-content {
            padding: 1.5rem 0 2.5rem;
        }
        .privacy-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 2rem 0 0.5rem;
            padding-bottom: 0.3rem;
            border-bottom: 2px solid var(--blue-light);
        }
        .privacy-content h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.2rem 0 0.3rem;
        }
        .privacy-content p {
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }
        .privacy-content ul {
            padding-left: 1.5rem;
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 0.5rem;
        }
        .privacy-content ul li {
            list-style: disc;
            margin-bottom: 0.2rem;
        }
        .privacy-content .highlight-box {
            background: var(--blue-light);
            border-radius: 0.8rem;
            padding: 1.2rem 1.8rem;
            margin: 1rem 0;
            border-left: 4px solid var(--blue-primary);
            font-size: 1rem;
        }

        .contact-hero {
            padding: 3.5rem 0 1.5rem;
        }
        .contact-hero .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
            align-items: start;
        }
        .contact-hero .contact-left h1 {
            font-size: 2.6rem;
            font-weight: 700;
        }
        .contact-hero .contact-left h1 span {
            color: var(--blue-primary);
        }
        .contact-hero .contact-left p {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin: 0.5rem 0 1.5rem;
        }
        .contact-hero .contact-info .info-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            font-size: 1rem;
            padding: 0.4rem 0;
        }
        .contact-hero .contact-info .info-item .icon {
            font-size: 1.3rem;
            width: 32px;
            text-align: center;
        }
        .contact-hero .contact-right {
            background: white;
            border-radius: 2rem;
            padding: 2.2rem 2.5rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            box-shadow: var(--shadow-soft);
        }
        .contact-hero .contact-right h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
        }
        .contact-hero .contact-right .sub {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }
        .contact-hero .contact-right .form-group {
            margin-bottom: 1.2rem;
        }
        .contact-hero .contact-right .form-group label {
            display: block;
            font-weight: 500;
            font-size: 0.9rem;
            margin-bottom: 0.2rem;
        }
        .contact-hero .contact-right .form-group input,
        .contact-hero .contact-right .form-group textarea,
        .contact-hero .contact-right .form-group select {
            width: 100%;
            padding: 0.7rem 1rem;
            border-radius: 12px;
            border: 1px solid rgba(30, 110, 240, 0.12);
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.2s;
            background: var(--gray-soft);
            outline: none;
        }
        .contact-hero .contact-right .form-group input:focus,
        .contact-hero .contact-right .form-group textarea:focus {
            border-color: var(--blue-primary);
            background: white;
        }
        .contact-hero .contact-right .form-group textarea {
            resize: vertical;
            min-height: 90px;
        }
		
		/* ===== 关于我们 & 加入我们 ===== */
        .about-hero,
        .careers-hero {
            padding: 3.5rem 0 1.5rem;
        }
        .about-hero h1,
        .careers-hero h1 {
            font-size: 2.6rem;
            font-weight: 700;
        }
        .about-hero h1 span,
        .careers-hero h1 span {
            color: var(--blue-primary);
        }
        .about-section h2,
        .careers-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            border-left: 5px solid var(--blue-primary);
            padding-left: 1rem;
        }
        .about-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .about-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
            text-align: center;
        }
        .about-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: rgba(30, 110, 240, 0.12);
        }
        .about-card .icon {
            font-size: 2.4rem;
            margin-bottom: 0.3rem;
        }
        .about-card h4 {
            font-size: 1.15rem;
            font-weight: 600;
        }
        .about-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-top: 0.2rem;
        }
        .careers-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .careers-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 1.8rem 2rem;
            border: 1px solid rgba(30, 110, 240, 0.06);
            transition: 0.2s;
        }
        .careers-card:hover {
            border-color: rgba(30, 110, 240, 0.15);
            box-shadow: var(--shadow-soft);
        }
        .careers-card h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 0.3rem;
        }
        .careers-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        .careers-card .job-tag {
            display: inline-block;
            background: var(--blue-light);
            color: var(--blue-primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.15rem 0.8rem;
            border-radius: 40px;
            margin-right: 0.3rem;
            margin-bottom: 0.3rem;
        }
        .careers-card .job-list {
            list-style: none;
            padding-left: 0;
        }
        .careers-card .job-list li {
            padding: 0.4rem 0;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            font-size: 0.95rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .careers-card .job-list li:last-child {
            border-bottom: none;
        }
        .careers-card .job-list li .job-name {
            font-weight: 500;
        }
        .careers-card .job-list li .job-loc {
            color: var(--text-muted);
            font-size: 0.85rem;
        }
		
		/* ===== 商务合作 ===== */
        .cooperation-hero { padding: 3.5rem 0 1.5rem; }
        .cooperation-hero h1 { font-size: 2.6rem; font-weight: 700; }
        .cooperation-hero h1 span { color: var(--blue-primary); }
        .cooperation-section h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 1.2rem; border-left: 5px solid var(--blue-primary); padding-left: 1rem; }
        .cooperation-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 1.5rem; }
        .cooperation-card { background: white; border-radius: var(--radius-card); padding: 1.8rem; border: 1px solid rgba(30,110,240,0.06); transition: 0.2s; text-align: center; }
        .cooperation-card:hover { box-shadow: var(--shadow-hover); border-color: rgba(30,110,240,0.12); }
        .cooperation-card .icon { font-size: 2.4rem; margin-bottom: 0.3rem; }
        .cooperation-card h4 { font-size: 1.15rem; font-weight: 600; }
        .cooperation-card p { font-size: 0.95rem; color: var(--text-muted); margin-top: 0.2rem; }
        .cooperation-process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 1.5rem; }
        .process-step { background: white; border-radius: var(--radius-card); padding: 1.5rem; border: 1px solid rgba(30,110,240,0.06); text-align: center; position: relative; }
        .process-step .step-num { display: inline-flex; align-items: center; justify-content: center; width: 2.4rem; height: 2.4rem; background: var(--blue-light); color: var(--blue-primary); border-radius: 50%; font-weight: 700; font-size: 1rem; margin-bottom: 0.5rem; }
        .process-step h4 { font-size: 1rem; font-weight: 600; }
        .process-step p { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.2rem; }
        .cooperation-contact { background: white; border-radius: var(--radius-card); padding: 2rem 2.5rem; border: 1px solid rgba(30,110,240,0.06); text-align: center; margin-top: 2rem; }
        .cooperation-contact p { font-size: 1.05rem; color: var(--text-dark); }
        .cooperation-contact .email { font-size: 1.3rem; font-weight: 700; color: var(--blue-primary); margin: 0.5rem 0; }
		
		/* ===== APP下载页 ===== */
        .app-hero { padding: 3.5rem 0 2rem; }
        .app-hero .app-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
        .app-hero .app-left h1 { font-size: 3rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }
        .app-hero .app-left h1 span { color: var(--blue-primary); }
        .app-hero .app-left .sub { color: var(--text-muted); font-size: 1.15rem; margin: 0.5rem 0 1rem; }
        .app-hero .app-left .desc { color: var(--text-muted); font-size: 1.05rem; max-width: 520px; margin-bottom: 1.5rem; }
        .app-download-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
        .app-download-btns .btn-store {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            background: white;
            border: 1px solid rgba(30,110,240,0.12);
            border-radius: 1rem;
            padding: 0.8rem 1.5rem;
            cursor: pointer;
            transition: 0.2s;
            box-shadow: var(--shadow-soft);
        }
        .app-download-btns .btn-store:hover { border-color: var(--blue-primary); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
        .app-download-btns .btn-store .store-icon { font-size: 1.8rem; }
        .app-download-btns .btn-store .store-text { text-align: left; }
        .app-download-btns .btn-store .store-text small { display: block; font-size: 0.7rem; color: var(--text-muted); }
        .app-download-btns .btn-store .store-text strong { font-size: 1rem; color: var(--text-dark); }
        .app-right .app-showcase { background: var(--gray-soft); border-radius: 2rem; padding: 2.5rem 2rem; text-align: center; border: 1px solid rgba(30,110,240,0.06); max-width: 400px; width: 100%; margin: 0 auto; }
        .app-right .app-showcase .app-icon { font-size: 4rem; margin-bottom: 0.5rem; }
        .app-right .app-showcase h3 { font-size: 1.4rem; font-weight: 700; }
        .app-right .app-showcase .qr-placeholder { width: 160px; height: 160px; margin: 0.8rem auto; background: white; border-radius: 1rem; display: flex; align-items: center; justify-content: center; font-size: 2.5rem; border: 2px dashed rgba(30,110,240,0.12); color: var(--blue-primary); }
        .app-right .app-showcase .hint-text { font-size: 0.85rem; color: var(--text-muted); }

        .app-features { padding: 2.5rem 0; }
        .app-features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 1.5rem; }
        .app-feature-card { background: white; border-radius: var(--radius-card); padding: 1.8rem; border: 1px solid rgba(30,110,240,0.06); transition: 0.2s; text-align: center; }
        .app-feature-card:hover { box-shadow: var(--shadow-hover); border-color: rgba(30,110,240,0.12); }
        .app-feature-card .icon { font-size: 2.4rem; margin-bottom: 0.3rem; }
        .app-feature-card h4 { font-size: 1.15rem; font-weight: 600; }
        .app-feature-card p { font-size: 0.95rem; color: var(--text-muted); margin-top: 0.2rem; }

        .app-requirements { padding: 2rem 0; }
        .requirements-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-top: 1.5rem; }
        .requirement-card { background: white; border-radius: var(--radius-card); padding: 1.8rem 2rem; border: 1px solid rgba(30,110,240,0.06); }
        .requirement-card h4 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.4rem; }
        .requirement-card ul { list-style: none; padding-left: 0; }
        .requirement-card ul li { padding: 0.3rem 0; font-size: 0.95rem; color: var(--text-muted); display: flex; align-items: center; gap: 0.4rem; }
        .requirement-card ul li::before { content: '•'; color: var(--blue-primary); font-weight: 700; }

        .app-changelog { padding: 2rem 0; }
        .changelog-list { margin-top: 1.5rem; }
        .changelog-item { background: white; border-radius: var(--radius-card); padding: 1.5rem 2rem; margin-bottom: 1rem; border: 1px solid rgba(30,110,240,0.06); }
        .changelog-item .version-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
        .changelog-item .version-header h4 { font-size: 1.1rem; font-weight: 600; }
        .changelog-item .version-header .version-date { font-size: 0.85rem; color: var(--text-muted); }
        .changelog-item ul { margin-top: 0.5rem; padding-left: 1.2rem; color: var(--text-muted); font-size: 0.9rem; }
        .changelog-item ul li { list-style: disc; margin-bottom: 0.15rem; }

        /* ===== 服务条款 ===== */
        .terms-hero { padding: 3.5rem 0 1.5rem; }
        .terms-hero h1 { font-size: 2.6rem; font-weight: 700; }
        .terms-hero h1 span { color: var(--blue-primary); }
        .terms-content { padding: 1.5rem 0 2.5rem; }
        .terms-content h2 { font-size: 1.5rem; font-weight: 700; margin: 2rem 0 0.5rem; padding-bottom: 0.3rem; border-bottom: 2px solid var(--blue-light); }
        .terms-content h3 { font-size: 1.15rem; font-weight: 600; margin: 1.2rem 0 0.3rem; }
        .terms-content p { color: var(--text-muted); font-size: 1rem; margin-bottom: 0.5rem; }
        .terms-content ul { padding-left: 1.5rem; color: var(--text-muted); font-size: 1rem; margin-bottom: 0.5rem; }
        .terms-content ul li { list-style: disc; margin-bottom: 0.2rem; }
        .terms-content .highlight-box { background: var(--blue-light); border-radius: 0.8rem; padding: 1.2rem 1.8rem; margin: 1rem 0; border-left: 4px solid var(--blue-primary); font-size: 1rem; }

        /* ===== 隐私政策 ===== */
        .privacy-hero { padding: 3.5rem 0 1.5rem; }
        .privacy-hero h1 { font-size: 2.6rem; font-weight: 700; }
        .privacy-hero h1 span { color: var(--blue-primary); }
        .privacy-content { padding: 1.5rem 0 2.5rem; }
        .privacy-content h2 { font-size: 1.5rem; font-weight: 700; margin: 2rem 0 0.5rem; padding-bottom: 0.3rem; border-bottom: 2px solid var(--blue-light); }
        .privacy-content h3 { font-size: 1.15rem; font-weight: 600; margin: 1.2rem 0 0.3rem; }
        .privacy-content p { color: var(--text-muted); font-size: 1rem; margin-bottom: 0.5rem; }
        .privacy-content ul { padding-left: 1.5rem; color: var(--text-muted); font-size: 1rem; margin-bottom: 0.5rem; }
        .privacy-content ul li { list-style: disc; margin-bottom: 0.2rem; }
        .privacy-content .highlight-box { background: var(--blue-light); border-radius: 0.8rem; padding: 1.2rem 1.8rem; margin: 1rem 0; border-left: 4px solid var(--blue-primary); font-size: 1rem; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .core-grid,
            .position-grid,
            .core-features-grid,
            .specs-light-grid,
            .product-features .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .help-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .voice-commands .command-category ul {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            html {
                font-size: 16px; /* 移动端适当降低字号 */
            }
            .container {
                padding: 0 1.2rem;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                gap: 1rem;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                padding: 1.5rem 2rem;
                border-bottom: 1px solid rgba(30, 110, 240, 0.06);
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
            }
            .nav-links.open {
                display: flex;
            }
            .mobile-toggle {
                display: flex;
            }
            .hero-grid,
            .home-hardware .hardware-grid,
            .product-hero .product-grid,
            .contact-hero .contact-grid,
            .platform-flow {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .platform-flow .arrow {
                transform: rotate(90deg);
            }
            .hero-left h1 {
                font-size: 2.4rem;
            }
            .hero-right {
                order: -1;
            }
            .core-grid,
            .position-grid,
            .core-features-grid,
            .specs-light-grid,
            .product-features .feature-grid,
            .help-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom .links {
                flex-wrap: wrap;
                justify-content: center;
            }
            .cta-section {
                padding: 1.8rem 1.2rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .product-hero .product-left h1 {
                font-size: 2.4rem;
            }
            .product-hero .product-specs-mini {
                grid-template-columns: 1fr;
            }
            .modal-box {
                padding: 1.8rem 1.5rem 1.5rem;
            }
            .modal-box .qr-placeholder {
                width: 140px;
                height: 140px;
            }
            .contact-hero .contact-right {
                padding: 1.2rem;
            }
            .specs-light-grid {
                grid-template-columns: 1fr 1fr;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
            .voice-commands .command-category ul {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .nav-actions .btn-primary,
            .nav-actions .btn-outline {
                padding: 0.3rem 0.8rem;
                font-size: 0.7rem;
            }
            .logo {
                font-size: 1.1rem;
            }
            .logo img {
                height: 28px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 0.8rem;
            }
            .specs-light-grid {
                grid-template-columns: 1fr 1fr;
            }
        }