:root {
            --bg: #ffffff;
            --surface: #fff5f7;
            --surface-alt: #fff0f4;
            --text: #1a1025;
            --text-secondary: #4a3348;
            --text-muted: #7a5d6e;
            --accent: #e85382;
            --accent-deep: #c0395c;
            --accent-light: #ff8fab;
            --accent-soft: #ffd4e0;
            --accent-glow: rgba(232, 83, 130, 0.10);
            --accent-glow-strong: rgba(232, 83, 130, 0.18);
            --border: #f0dce3;
            --border-light: #fce8ef;
            --shadow-sm: 0 1px 4px rgba(180, 60, 100, 0.05);
            --shadow-md: 0 8px 28px rgba(180, 60, 100, 0.08);
            --shadow-lg: 0 20px 52px rgba(180, 60, 100, 0.10);
            --shadow-xl: 0 32px 72px rgba(180, 60, 100, 0.12);
            --radius-sm: 12px;
            --radius: 20px;
            --radius-lg: 28px;
            --radius-xl: 36px;
            --transition: 0.26s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --gradient-hero: linear-gradient(135deg, #e85382 0%, #ff6b8a 30%, #ff8fab 55%, #ffb3c6 100%);
            --gradient-card-accent: linear-gradient(160deg, #fff5f7 0%, #ffffff 60%, #fff0f4 100%);
            --gradient-cta: linear-gradient(135deg, #2d1020 0%, #3d1a2e 40%, #2d1020 100%);
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 28px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== HEADER (与首页一致) ===== */
        header {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        header.scrolled {
            box-shadow: var(--shadow-md);
            background: rgba(255, 255, 255, 0.96);
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            flex-wrap: wrap;
            gap: 12px;
        }
        .logo {
            font-size: 1.7rem;
            font-weight: 900;
            letter-spacing: -0.03em;
            background: var(--gradient-hero);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            flex-shrink: 0;
            white-space: nowrap;
            text-decoration: none;
            display: inline-block;
        }
        .logo-icon {
            display: inline-block;
            font-size: 1.5rem;
            margin-right: 2px;
            vertical-align: -2px;
        }
        .nav-links {
            display: flex;
            gap: 22px;
            align-items: center;
            flex-wrap: wrap;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            font-size: 0.9rem;
            position: relative;
            padding: 5px 2px;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2.5px;
            background: var(--accent);
            border-radius: 3px;
            transition: width var(--transition);
        }
        .nav-links a:hover {
            color: var(--accent);
        }
        .nav-links a:hover::after {
            width: 100%;
        }
        .nav-links a.active {
            color: var(--accent);
            font-weight: 700;
        }
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a.nav-highlight {
            background: var(--accent-soft);
            color: var(--accent-deep);
            padding: 8px 18px;
            border-radius: 28px;
            font-weight: 600;
            transition: var(--transition);
        }
        .nav-links a.nav-highlight:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(232, 83, 130, 0.3);
        }
        .nav-links a.nav-highlight::after {
            display: none;
        }

        /* ===== 页面Hero ===== */
        .page-hero {
            padding: 60px 0 44px;
            background: radial-gradient(ellipse at 30% 20%, rgba(255, 143, 171, 0.06) 0%, #ffffff 60%);
            text-align: center;
        }
        .page-hero h1 {
            font-size: clamp(2rem, 4vw, 2.8rem);
            font-weight: 900;
            margin-bottom: 14px;
            color: #1a0d16;
            letter-spacing: -0.02em;
        }
        .page-hero .hero-gradient-text {
            background: var(--gradient-hero);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .page-hero .subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto 20px;
            line-height: 1.6;
        }

        /* ===== Section标题 ===== */
        .section-title-v2 {
            text-align: center;
            font-size: clamp(1.6rem, 3vw, 2rem);
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--text);
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 44px;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }
        .section-accent-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            margin: 0 6px;
            vertical-align: middle;
        }

        /* ===== 原理卡片 ===== */
        .principle-section {
            padding: 70px 0;
            background: var(--surface);
        }
        .principle-grid {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }
        .principle-card {
            flex: 1;
            min-width: 240px;
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            box-shadow: var(--shadow-sm);
            border: 1.5px solid var(--border-light);
            transition: var(--transition);
        }
        .principle-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(232, 83, 130, 0.25);
        }
        .principle-card h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
            color: var(--text);
        }
        .principle-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.55;
        }

        /* ===== 功能模块两列布局 ===== */
        .features-detail {
            padding: 70px 0;
            background: #fff;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .feature-item {
            background: #fff5f7;
            border-radius: var(--radius);
            padding: 24px 20px;
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .feature-item:hover {
            border-color: rgba(232, 83, 130, 0.3);
            background: #fff;
            box-shadow: var(--shadow-md);
        }
        .feature-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            color: var(--text);
        }
        .feature-item p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ===== 配置流程步骤 ===== */
        .config-steps {
            padding: 70px 0;
            background: var(--surface);
        }
        .steps-vertical {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .step-row {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            background: #fff;
            padding: 22px 24px;
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .step-row:hover {
            border-color: rgba(232, 83, 130, 0.25);
            box-shadow: var(--shadow-md);
        }
        .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1rem;
            flex-shrink: 0;
            box-shadow: 0 6px 16px rgba(232, 83, 130, 0.25);
        }
        .step-content h4 {
            font-size: 1.1rem;
            color: var(--text);
            margin-bottom: 4px;
        }
        .step-content p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 70px 0;
            background: #fff;
        }
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 18px;
            max-width: 960px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff5f7;
            border-radius: var(--radius);
            padding: 20px 22px;
            border: 1.5px solid var(--border-light);
            transition: var(--transition);
        }
        .faq-item:hover {
            background: #ffffff;
            border-color: rgba(232, 83, 130, 0.22);
            box-shadow: var(--shadow-md);
        }
        .faq-item h4 {
            font-size: 0.98rem;
            margin-bottom: 6px;
            color: var(--text);
        }
        .faq-item p {
            font-size: 0.86rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ===== 底部CTA (与首页相同) ===== */
        .download-cta-section {
            padding: 68px 0;
            background: var(--gradient-cta);
            color: #ffffff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .download-cta-section::before {
            content: '';
            position: absolute;
            top: -30%;
            left: -15%;
            width: 130%;
            height: 160%;
            background: radial-gradient(ellipse at center, rgba(232, 83, 130, 0.3) 0%, transparent 65%);
            pointer-events: none;
        }
        .download-cta-section .cta-inner {
            position: relative;
            z-index: 1;
        }
        .download-cta-section h2 {
            font-size: clamp(1.5rem, 3vw, 2.1rem);
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .download-cta-section p {
            margin: 14px auto 0;
            max-width: 520px;
            opacity: 0.88;
            font-size: 0.95rem;
            line-height: 1.55;
        }
        .btn-download-cta {
            background: #ffffff;
            color: #c0395c;
            padding: 16px 48px;
            border-radius: 60px;
            font-weight: 700;
            text-decoration: none;
            display: inline-block;
            margin-top: 28px;
            transition: var(--transition);
            font-size: 1rem;
            letter-spacing: 0.02em;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            position: relative;
            z-index: 1;
        }
        .btn-download-cta:hover {
            background: #ffe0e8;
            transform: scale(1.04);
            box-shadow: 0 16px 40px rgba(232, 83, 130, 0.4);
            color: #9b3050;
        }
        .cta-extra-info {
            margin-top: 26px;
            font-size: 0.8rem;
            opacity: 0.7;
            position: relative;
            z-index: 1;
        }
        .cta-features-row {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 20px;
            position: relative;
            z-index: 1;
        }
        .cta-features-row span {
            background: rgba(255, 255, 255, 0.1);
            padding: 8px 18px;
            border-radius: 28px;
            font-size: 0.82rem;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        /* ===== FOOTER (与首页一致) ===== */
        footer {
            background: #1a0d16;
            color: #b8a0ae;
            padding: 50px 0 26px;
        }
        .footer-grid {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 34px;
            margin-bottom: 38px;
        }
        .footer-grid>div {
            min-width: 140px;
        }
        .footer-grid h4 {
            color: #ffffff;
            font-size: 0.94rem;
            margin-bottom: 8px;
            font-weight: 700;
        }
        .footer-grid ul {
            list-style: none;
        }
        .footer-grid ul li {
            margin-bottom: 5px;
        }
        .footer-grid a {
            color: #b8a0ae;
            text-decoration: none;
            font-size: 0.84rem;
            transition: var(--transition);
        }
        .footer-grid a:hover {
            color: #ffb3c6;
        }
        .footer-bottom {
            border-top: 1px solid #2d1a24;
            padding-top: 22px;
            text-align: center;
            font-size: 0.76rem;
            color: #7a5d6e;
        }

        @media (max-width: 768px) {
            .principle-grid {
                flex-direction: column;
            }
            .container {
                padding: 0 16px;
            }
            .step-row {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                gap: 20px;
            }
        }
        @media (max-width: 600px) {
            nav {
                flex-direction: column;
                align-items: flex-start;
            }
            .nav-links {
                width: 100%;
                justify-content: flex-start;
                gap: 10px;
                flex-wrap: wrap;
            }
            .nav-links a.nav-highlight {
                padding: 6px 14px;
                font-size: 0.76rem;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }