:root {
            --navy-900: #0a1428;
            --navy-800: #0f1d35;
            --navy-700: #16294a;
            --navy-600: #1d3761;
            --navy-500: #274a7a;
            --orange-500: #ff6b35;
            --orange-400: #ff8c42;
            --orange-300: #ffab6e;
            --cyan-500: #00b4d8;
            --cyan-400: #2ec4d6;
            --bg-light: #f7f9fc;
            --bg-white: #ffffff;
            --text-dark: #0f1626;
            --text-mid: #3a4a5f;
            --text-light: #6b7d93;
            --border-light: #e3e8f0;
            --shadow-sm: 0 2px 12px rgba(10, 20, 40, 0.06);
            --shadow-md: 0 8px 30px rgba(10, 20, 40, 0.1);
            --shadow-lg: 0 20px 60px rgba(10, 20, 40, 0.15);
            --radius-sm: 10px;
            --radius-md: 18px;
            --radius-lg: 26px;
            --radius-xl: 36px;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --transition: 0.28s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-white);
            color: var(--text-dark);
            line-height: 1.65;
            font-size: 16px;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--orange-500);
        }
        img {
            max-width: 100%;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        .wrap {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 28px;
        }

        /* 顶部信息栏 */
        .topbar {
            background: var(--navy-900);
            color: #b8c7dd;
            font-size: 13.5px;
            padding: 9px 0;
            letter-spacing: 0.03em;
            border-bottom: 1px solid rgba(255, 107, 53, 0.25);
        }
        .topbar .wrap {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px 12px;
        }
        .topbar .tb-dot {
            color: var(--orange-400);
            font-weight: 700;
            margin-right: 4px;
        }
        .tb-sep {
            color: var(--orange-500);
            opacity: 0.6;
            font-size: 10px;
        }
        .topbar a {
            color: var(--orange-300);
            font-weight: 600;
            border-bottom: 1px dashed rgba(255, 171, 110, 0.4);
        }
        .topbar a:hover {
            color: #fff;
            border-bottom-color: #fff;
        }

        /* 导航栏 */
        .masthead {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(10, 20, 40, 0.04);
        }
        .masthead .wrap {
            display: flex;
            align-items: center;
            gap: 18px;
            height: 72px;
        }
        .wordmark {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .wm-mark {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--navy-700), var(--navy-500));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 800;
            font-size: 20px;
            box-shadow: 0 3px 12px rgba(10, 20, 40, 0.2);
        }
        .wm-text {
            display: flex;
            flex-direction: column;
            line-height: 1.15;
        }
        .wm-name {
            font-weight: 800;
            font-size: 22px;
            color: var(--navy-900);
            letter-spacing: -0.02em;
        }
        .wm-sub {
            font-size: 11px;
            color: var(--orange-500);
            font-weight: 700;
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }
        .nav-wrap {
            display: flex;
            align-items: center;
            gap: 2px;
            margin-left: auto;
            flex-wrap: wrap;
        }
        .nav-wrap>a,
        .dd>button {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 10px 14px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-mid);
            border-radius: 8px;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-wrap>a:hover,
        .dd>button:hover {
            color: var(--orange-500);
            background: #fff4ef;
        }
        .nav-wrap>a.on {
            color: var(--orange-500);
            background: #fff4ef;
            box-shadow: inset 0 -2px 0 var(--orange-500);
        }
        .dd {
            position: relative;
        }
        .dd-menu {
            position: absolute;
            top: calc(100% + 6px);
            left: 0;
            background: #fff;
            border-radius: 14px;
            box-shadow: var(--shadow-md);
            padding: 8px 0;
            min-width: 190px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
            z-index: 50;
        }
        .dd:hover .dd-menu,
        .dd:focus-within .dd-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .dd-menu a {
            display: block;
            padding: 9px 18px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-mid);
            border-radius: 6px;
            transition: all 0.2s;
        }
        .dd-menu a:hover {
            background: #fff4ef;
            color: var(--orange-500);
            padding-left: 22px;
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--orange-500), var(--orange-400));
            color: #fff;
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 14px;
            box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-cta:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 22px rgba(255, 107, 53, 0.45);
            color: #fff;
        }
        .nav-toggle-input {
            display: none;
        }
        .nav-toggle-label {
            display: none;
            font-size: 26px;
            color: var(--navy-900);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: 8px;
            user-select: none;
        }
        @media (max-width: 860px) {
            .nav-wrap {
                position: fixed;
                top: 72px;
                right: 0;
                width: 300px;
                max-width: 85vw;
                height: calc(100vh - 72px);
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 16px 20px 40px;
                box-shadow: -8px 0 40px rgba(10,20,40,0.12);
                transform: translateX(110%);
                transition: transform var(--transition);
                overflow-y: auto;
                border-left: 1px solid var(--border-light);
            }
            .nav-toggle-label {
                display: block;
                margin-left: auto;
            }
            .nav-toggle-input:checked~.nav-wrap {
                transform: translateX(0);
            }
            .nav-wrap>a,
            .dd>button {
                padding: 13px 16px;
                font-size: 16px;
                width: 100%;
                border-radius: 10px;
            }
            .dd-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                border: none;
                padding: 0 0 8px 20px;
                min-width: auto;
            }
            .dd-menu a {
                padding: 8px 14px;
                font-size: 14px;
            }
            .nav-cta {
                margin-top: 12px;
                text-align: center;
                justify-content: center;
                border-radius: 12px;
            }
            .masthead .wrap {
                height: 64px;
            }
        }

        /* 跑马灯 */
        .marquee {
            background: linear-gradient(90deg, var(--navy-900), var(--navy-700), var(--navy-900));
            overflow: hidden;
            padding: 10px 0;
            border-bottom: 2px solid var(--orange-500);
        }
        .marquee-inner {
            display: flex;
            align-items: center;
            gap: 28px;
            white-space: nowrap;
            animation: marquee-scroll 28s linear infinite;
            width: max-content;
            color: #cdd9ea;
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.05em;
        }
        .marquee-inner i {
            color: var(--orange-400);
            font-style: normal;
            font-size: 10px;
        }
        @keyframes marquee-scroll {
            0% {
                transform: translateX(0);
            }
            100% {
                transform: translateX(-50%);
            }
        }

        /* Hero PC 通用版 */
        .hero-pc {
            background: linear-gradient(155deg, #0a1428 0%, #0f1d35 30%, #1d3761 70%, #16294a 100%);
            position: relative;
            overflow: hidden;
            padding: 80px 0 90px;
            color: #fff;
        }
        .hero-pc::before {
            content: '';
            position: absolute;
            inset: 0;
            background:
                radial-gradient(ellipse at 30% 20%, rgba(255, 107, 53, 0.18) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 70%, rgba(0, 180, 216, 0.15) 0%, transparent 50%);
            pointer-events: none;
        }
        .hero-pc .wrap {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 50px;
            align-items: center;
        }
        .pc-pill {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 180, 216, 0.12);
            border: 1px solid rgba(0, 180, 216, 0.35);
            padding: 7px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 600;
            color: #7dd8e8;
            margin-bottom: 22px;
            letter-spacing: 0.04em;
        }
        .pc-pill .pc-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--cyan-400);
            animation: ping-ring 1.8s ease-out infinite;
        }
        @keyframes ping-ring {
            0% {
                box-shadow: 0 0 0 0 rgba(0, 180, 216, 0.5);
            }
            100% {
                box-shadow: 0 0 0 12px rgba(0, 180, 216, 0);
            }
        }
        .hero-pc h1 {
            font-size: clamp(2rem, 4vw, 3.2rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: 18px;
            color: #fff;
        }
        .hero-pc h1 .pc-hl {
            background: linear-gradient(135deg, var(--orange-400), var(--cyan-400));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .pc-sub {
            font-size: 16.5px;
            color: #b8c7dd;
            max-width: 520px;
            line-height: 1.75;
            margin-bottom: 32px;
        }
        .pc-sub strong {
            color: #fff;
            font-weight: 700;
        }
        .pc-hero-cta {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 15.5px;
            transition: all var(--transition);
            letter-spacing: 0.02em;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--orange-500), var(--orange-400));
            color: #fff;
            box-shadow: 0 6px 24px rgba(255, 107, 53, 0.4);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 32px rgba(255, 107, 53, 0.5);
            color: #fff;
        }
        .btn-ghost {
            background: rgba(255, 255, 255, 0.08);
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            backdrop-filter: blur(6px);
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--orange-500);
            color: var(--orange-500);
            font-weight: 600;
        }
        .btn-outline:hover {
            background: var(--orange-500);
            color: #fff;
        }
        .pc-trust {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 13px;
            color: #9aafc8;
            font-weight: 500;
        }
        .pc-trust span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .pc-trust span::before {
            content: '✓';
            color: var(--cyan-400);
            font-weight: 800;
            font-size: 14px;
        }

        .pc-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .pc-visual svg {
            width: 100%;
            max-width: 480px;
            height: auto;
            filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.45));
        }
        @media (max-width: 900px) {
            .hero-pc .wrap {
                grid-template-columns: 1fr;
                gap: 40px;
                text-align: center;
            }
            .pc-sub {
                margin-left: auto;
                margin-right: auto;
            }
            .pc-hero-cta {
                justify-content: center;
            }
            .pc-trust {
                justify-content: center;
            }
            .pc-visual {
                order: -1;
            }
            .hero-pc {
                padding: 50px 0 60px;
            }
        }

        /* 系统选择卡片 */
        .dual-download {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-top: -50px;
            position: relative;
            z-index: 5;
        }
        .os-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            border: 1.5px solid var(--border-light);
            transition: all var(--transition);
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
            text-align: center;
        }
        .os-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
        }
        .os-card.windows::before {
            background: linear-gradient(90deg, var(--cyan-500), var(--cyan-400));
        }
        .os-card.macos::before {
            background: linear-gradient(90deg, var(--orange-500), var(--orange-400));
        }
        .os-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: #b9c9dd;
        }
        .os-card .os-icon {
            font-size: 52px;
            margin-bottom: 14px;
        }
        .os-card h3 {
            font-size: 22px;
            font-weight: 800;
            color: var(--navy-900);
            margin-bottom: 8px;
        }
        .os-card .os-version {
            font-size: 13px;
            color: var(--text-light);
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 18px;
        }
        .os-card .os-dl-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 15px;
            transition: all var(--transition);
        }
        .os-card.windows .os-dl-btn {
            background: linear-gradient(135deg, var(--cyan-500), var(--cyan-400));
            color: #fff;
            box-shadow: 0 4px 14px rgba(0, 180, 216, 0.3);
        }
        .os-card.macos .os-dl-btn {
            background: linear-gradient(135deg, var(--orange-500), var(--orange-400));
            color: #fff;
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
        }
        .os-card .os-dl-btn:hover {
            transform: translateY(-2px);
            color: #fff;
        }
        .os-card .os-meta {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-top: 18px;
            font-size: 12px;
            color: var(--text-light);
            flex-wrap: wrap;
        }
        .os-card .os-meta span {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        @media (max-width: 700px) {
            .dual-download {
                grid-template-columns: 1fr;
                margin-top: -30px;
            }
        }

        /* 版本信息条 */
        .version-strip {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
            margin-top: 40px;
        }
        .version-strip .wrap {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px 28px;
            justify-content: center;
            text-align: center;
        }
        .v-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13.5px;
            color: var(--text-mid);
            font-weight: 500;
        }
        .v-item .v-ic {
            color: var(--orange-500);
            font-size: 18px;
        }
        .v-item strong {
            color: var(--navy-900);
            font-weight: 700;
        }

        /* 通用 section */
        .section {
            padding: 72px 0;
        }
        .section.alt {
            background: var(--bg-light);
        }
        .sec-head {
            text-align: center;
            margin-bottom: 46px;
        }
        .sec-head.left {
            text-align: left;
        }
        .sec-head .kicker {
            display: inline-block;
            font-size: 12.5px;
            font-weight: 700;
            letter-spacing: 0.14em;
            text-transform: uppercase;
            color: var(--cyan-500);
            margin-bottom: 8px;
            background: #eef6fe;
            padding: 5px 14px;
            border-radius: 20px;
        }
        .sec-head h2 {
            font-size: clamp(1.6rem, 3vw, 2.4rem);
            font-weight: 800;
            color: var(--navy-900);
            letter-spacing: -0.02em;
            margin-top: 6px;
        }
        .sec-head p {
            color: var(--text-light);
            font-size: 16px;
            max-width: 580px;
            margin: 10px auto 0;
        }
        .sec-head.left p {
            margin-left: 0;
        }

        /* 桌面端通用优势网格 */
        .pc-features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
        }
        .pc-feature-card {
            background: #fff;
            border-radius: var(--radius-md);
            padding: 26px 18px;
            text-align: center;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .pc-feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--cyan-500), var(--orange-400));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .pc-feature-card:hover {
            border-color: var(--orange-300);
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }
        .pc-feature-card:hover::before {
            opacity: 1;
        }
        .pc-feature-card .pf-icon {
            font-size: 34px;
            margin-bottom: 10px;
        }
        .pc-feature-card h3 {
            font-size: 15.5px;
            font-weight: 700;
            color: var(--navy-900);
            margin-bottom: 6px;
        }
        .pc-feature-card p {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .pc-features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 500px) {
            .pc-features-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 模拟桌面端界面 */
        .desktop-preview {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .desktop-mockup {
            background: var(--navy-900);
            border-radius: var(--radius-lg);
            padding: 0;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
        }
        .desktop-titlebar {
            background: rgba(255, 255, 255, 0.05);
            padding: 12px 20px;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .desktop-dots {
            display: flex;
            gap: 6px;
            margin-right: 12px;
        }
        .desktop-dots span {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #ff5f57;
        }
        .desktop-dots span:nth-child(2) {
            background: #febc2e;
        }
        .desktop-dots span:nth-child(3) {
            background: #28c840;
        }
        .desktop-titlebar-title {
            color: #a0b1c6;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        .desktop-body {
            padding: 30px 25px;
            color: #fff;
            position: relative;
            z-index: 1;
        }
        .desktop-status {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
            background: rgba(0, 180, 216, 0.1);
            padding: 12px 16px;
            border-radius: 10px;
            border: 1px solid rgba(0, 180, 216, 0.2);
        }
        .desktop-status-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--cyan-400);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(0, 180, 216, 0.4);
            }
            50% {
                box-shadow: 0 0 0 8px rgba(0, 180, 216, 0);
            }
        }
        .desktop-node-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .desktop-node-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 14px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 8px;
            font-size: 13px;
            color: #cdd9ea;
        }
        .desktop-node-item .dn-name {
            font-weight: 600;
            color: #fff;
        }
        .desktop-node-item .dn-latency {
            color: var(--cyan-400);
            font-weight: 700;
        }
        .desktop-preview .text-col h2 {
            font-size: clamp(1.5rem, 2.8vw, 2.2rem);
            font-weight: 800;
            color: var(--navy-900);
            margin-bottom: 14px;
        }
        .desktop-preview .text-col p {
            color: var(--text-light);
            font-size: 15.5px;
            margin-bottom: 18px;
            line-height: 1.7;
        }
        .desktop-preview .text-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .desktop-preview .text-col ul li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-mid);
            font-weight: 500;
        }
        .desktop-preview .text-col ul li::before {
            content: '🖥️';
            font-size: 13px;
        }
        @media (max-width: 800px) {
            .desktop-preview {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }

        /* 系统自动适配 */
        .auto-detect-demo {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 45px;
            align-items: center;
        }
        .detect-graphic {
            background: var(--navy-900);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .detect-graphic::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 50% 50%, rgba(0, 180, 216, 0.1) 0%, transparent 60%);
        }
        .detect-row {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 12px 0;
            border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
            position: relative;
            z-index: 1;
        }
        .detect-row:last-child {
            border-bottom: none;
        }
        .detect-badge {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }
        .db-scan {
            background: rgba(0, 180, 216, 0.2);
            border: 1px solid rgba(0, 180, 216, 0.4);
        }
        .db-pick {
            background: rgba(255, 107, 53, 0.2);
            border: 1px solid rgba(255, 107, 53, 0.4);
        }
        .db-install {
            background: rgba(46, 196, 214, 0.2);
            border: 1px solid rgba(46, 196, 214, 0.4);
        }
        .detect-info {
            flex: 1;
        }
        .detect-info strong {
            display: block;
            color: #fff;
            font-size: 14.5px;
        }
        .detect-info span {
            color: #a0b1c6;
            font-size: 12.5px;
        }
        .detect-status {
            font-size: 11px;
            font-weight: 800;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            padding: 3px 10px;
            border-radius: 14px;
            flex-shrink: 0;
        }
        .ds-ok {
            background: rgba(0, 180, 216, 0.25);
            color: var(--cyan-400);
        }
        .ds-safe {
            background: rgba(255, 107, 53, 0.2);
            color: var(--orange-300);
        }
        .auto-detect-demo .text-col h2 {
            font-size: clamp(1.5rem, 2.8vw, 2.2rem);
            font-weight: 800;
            color: var(--navy-900);
            margin-bottom: 14px;
        }
        .auto-detect-demo .text-col p {
            color: var(--text-light);
            font-size: 15.5px;
            margin-bottom: 18px;
            line-height: 1.7;
        }
        .auto-detect-demo .text-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .auto-detect-demo .text-col ul li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-mid);
            font-weight: 500;
        }
        .auto-detect-demo .text-col ul li::before {
            content: '⚙️';
            font-size: 13px;
        }
        @media (max-width: 800px) {
            .auto-detect-demo {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }

        /* 纯净承诺 */
        .pure-promise {
            background: linear-gradient(135deg, var(--navy-800), var(--navy-600));
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .pure-promise::before {
            content: '🛡️';
            position: absolute;
            right: 30px;
            top: 20px;
            font-size: 100px;
            opacity: 0.1;
        }
        .pure-promise h2 {
            font-size: clamp(1.6rem, 3vw, 2.3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }
        .pure-promise p {
            color: #b8c7dd;
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto 20px;
            line-height: 1.7;
        }
        .pure-badges {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 20px;
        }
        .pure-badge {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.15);
            padding: 10px 22px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .pure-badge span {
            font-size: 18px;
        }
        @media (max-width: 600px) {
            .pure-promise {
                padding: 36px 22px;
            }
            .pure-badges {
                flex-direction: column;
                align-items: center;
            }
        }

        /* 安装步骤 */
        .install-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .install-steps::before {
            content: '';
            position: absolute;
            top: 35px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--cyan-500), var(--orange-400), var(--cyan-500));
            opacity: 0.3;
        }
        .install-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .install-step .step-num {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            background: #fff;
            border: 3px solid var(--orange-400);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            font-weight: 800;
            margin: 0 auto 14px;
            box-shadow: var(--shadow-sm);
            color: var(--navy-900);
            transition: all var(--transition);
        }
        .install-step:hover .step-num {
            border-color: var(--cyan-500);
            box-shadow: var(--shadow-md);
            transform: scale(1.05);
        }
        .install-step h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--navy-900);
            margin-bottom: 4px;
        }
        .install-step p {
            font-size: 13px;
            color: var(--text-light);
            line-height: 1.6;
        }
        @media (max-width: 800px) {
            .install-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .install-steps::before {
                display: none;
            }
        }
        @media (max-width: 500px) {
            .install-steps {
                grid-template-columns: 1fr;
            }
        }

        /* FAQ */
        .faq-group details {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            margin-bottom: 10px;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-group details:hover {
            border-color: #c9d4e3;
        }
        .faq-group summary {
            padding: 18px 22px;
            font-weight: 700;
            font-size: 15px;
            color: var(--navy-900);
            cursor: pointer;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            user-select: none;
        }
        .faq-group summary::-webkit-details-marker {
            display: none;
        }
        .faq-group summary::after {
            content: '+';
            font-size: 22px;
            color: var(--cyan-500);
            font-weight: 700;
            flex-shrink: 0;
            transition: transform 0.3s;
        }
        .faq-group details[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-a {
            padding: 0 22px 20px;
            font-size: 14.5px;
            color: var(--text-mid);
            line-height: 1.7;
        }

        /* CTA 横幅 */
        .cta-band {
            background: linear-gradient(135deg, var(--orange-500), var(--orange-400), var(--cyan-500));
            border-radius: var(--radius-lg);
            padding: 50px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-band::before {
            content: '';
            position: absolute;
            top: -60%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.12) 0%, transparent 60%);
            animation: cta-glow 5s ease-in-out infinite;
        }
        @keyframes cta-glow {
            0%,
            100% {
                opacity: 0.3;
            }
            50% {
                opacity: 0.6;
            }
        }
        .cta-band h2 {
            font-size: clamp(1.6rem, 3vw, 2.3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            position: relative;
            z-index: 1;
        }
        .cta-band p {
            font-size: 16px;
            opacity: 0.95;
            margin: 8px 0 26px;
            position: relative;
            z-index: 1;
        }
        .cta-band .btn {
            position: relative;
            z-index: 1;
            background: var(--navy-900);
            color: #fff;
            box-shadow: 0 8px 24px rgba(10, 20, 40, 0.3);
        }
        .cta-band .btn:hover {
            background: var(--navy-800);
            transform: translateY(-2px);
        }

        /* Footer */
        .mastfoot {
            background: var(--navy-900);
            color: #a0b1c6;
            padding: 50px 0 24px;
            border-top: 3px solid var(--orange-500);
        }
        .mf-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .mf-brand .wordmark {
            margin-bottom: 14px;
        }
        .mf-brand .wm-name {
            color: #fff;
        }
        .mf-brand .wm-sub {
            color: var(--orange-400);
        }
        .mf-brand p {
            font-size: 13.5px;
            color: #8a9bb5;
            max-width: 300px;
            line-height: 1.7;
        }
        .mf-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }
        .mf-col a {
            display: block;
            font-size: 13.5px;
            color: #8a9bb5;
            padding: 5px 0;
            transition: all 0.25s;
        }
        .mf-col a:hover {
            color: var(--orange-400);
            padding-left: 6px;
        }
        .foot-line {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 18px;
            font-size: 12.5px;
            color: #6b7d93;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }
        @media (max-width: 800px) {
            .mf-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 500px) {
            .mf-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 600px) {
            .section {
                padding: 48px 0;
            }
            .wrap {
                padding: 0 18px;
            }
            .hero-pc h1 {
                font-size: 1.8rem;
            }
            .pc-sub {
                font-size: 15px;
            }
            .btn {
                padding: 12px 20px;
                font-size: 14px;
            }
        }