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

        :root {
            --bg: #f9f7fb;
            --bg-alt: #f3eff8;
            --ink: #1a102b;
            --ink-soft: #2d2340;
            --muted: #8b7d9e;
            --muted-light: #b8aec8;
            --primary: #7c5ce7;
            --primary-bright: #8b6cf6;
            --accent: #f472b6;
            --accent-soft: #f9a8d4;
            --accent-warm: #fb7185;
            --success: #34d399;
            --warning: #fbbf24;
            --rose: #f87171;
            --glass: rgba(255, 255, 255, .65);
            --glass-hover: rgba(255, 255, 255, .85);
            --line: rgba(124, 92, 231, .1);
            --line-bright: rgba(124, 92, 231, .2);
            --card-hover: rgba(244, 114, 182, .04);
            --glow-primary: rgba(124, 92, 231, .1);
            --glow-accent: rgba(244, 114, 182, .07);
            --shadow-sm: 0 2px 12px rgba(124, 92, 231, .05);
            --shadow-md: 0 8px 30px rgba(124, 92, 231, .08);
            --shadow-lg: 0 18px 50px rgba(124, 92, 231, .1);
            --radius-sm: 8px;
            --radius: 14px;
            --radius-lg: 20px;
            --radius-xl: 24px;
            --ease: cubic-bezier(.22, 1, .36, 1);
            --font-display: 'Syne', sans-serif;
            --font-body: 'Space Grotesk', sans-serif;
            --font-mono: 'DM Mono', monospace;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            overflow-x: hidden;
            -webkit-text-size-adjust: 100%
        }
        body {
            font-family: var(--font-body);
            background: var(--bg);
            color: var(--ink);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale
        }
        ::selection {
            background: #c4b5fd;
            color: #1a102b
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all .3s var(--ease)
        }
        ul {
            list-style: none
        }
        .container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 clamp(20px, 4vw, 60px)
        }
        h1,
        h2,
        h3,
        h4 {
            font-family: var(--font-display);
            font-weight: 800;
            letter-spacing: -.02em
        }
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            z-index: 0;
            pointer-events: none;
            background:
                radial-gradient(ellipse 70% 50% at 15% 85%, rgba(139, 108, 246, .04), transparent),
                radial-gradient(ellipse 55% 45% at 85% 15%, rgba(244, 114, 182, .04), transparent),
                radial-gradient(ellipse 40% 35% at 50% 50%, rgba(124, 92, 231, .02), transparent)
        }

        /* 导航栏 */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            backdrop-filter: blur(16px) saturate(1.3);
            -webkit-backdrop-filter: blur(16px) saturate(1.3);
            border-bottom: 1px solid var(--line);
            background: rgba(249, 247, 251, .78)
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 60px
        }
        .logo {
            font-family: var(--font-display);
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: .05em;
            background: linear-gradient(135deg, #7c5ce7, #8b6cf6, #f472b6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            flex-shrink: 0
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 26px
        }
        .nav-right a {
            font-size: .8rem;
            font-weight: 500;
            color: var(--muted);
            position: relative;
            letter-spacing: .02em;
            white-space: nowrap
        }
        .nav-right a:hover {
            color: var(--primary)
        }
        .nav-right a.active {
            color: var(--primary);
            font-weight: 600
        }
        .nav-download {
            padding: 8px 18px;
            border-radius: 6px;
            border: 1px solid rgba(124, 92, 231, .35);
            color: #7c5ce7 !important;
            font-weight: 600;
            font-size: .8rem;
            transition: all .3s ease;
            white-space: nowrap
        }
        .nav-download:hover {
            background: rgba(124, 92, 231, .08);
            box-shadow: 0 0 20px rgba(124, 92, 231, .12)
        }
        .mobile-btn {
            display: none;
            background: none;
            border: none;
            color: var(--ink);
            font-size: 1.4rem;
            cursor: pointer;
            padding: 4px
        }

        /* 面包屑 */
        .breadcrumb {
            position: relative;
            z-index: 1;
            padding: 84px 0 0;
            font-family: var(--font-mono);
            font-size: .78rem;
            color: var(--muted)
        }
        .breadcrumb a {
            color: var(--muted)
        }
        .breadcrumb a:hover {
            color: var(--primary)
        }
        .breadcrumb .sep {
            margin: 0 8px;
            opacity: .4
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 500
        }

        /* 帮助Hero */
        .help-hero {
            position: relative;
            z-index: 1;
            padding: clamp(30px, 5vh, 60px) 0 clamp(50px, 8vh, 90px);
            text-align: center
        }
        .help-hero .overline {
            font-family: var(--font-mono);
            font-size: .78rem;
            font-weight: 400;
            color: var(--primary);
            letter-spacing: .2em;
            text-transform: uppercase;
            margin-bottom: 20px;
            display: inline-flex;
            align-items: center;
            gap: 12px
        }
        .help-hero .overline::before,
        .help-hero .overline::after {
            content: '';
            width: 28px;
            height: 1px;
            background: var(--primary)
        }
        .help-hero h1 {
            font-size: clamp(2rem, 4.5vw, 3.8rem);
            line-height: 1.1;
            margin-bottom: 16px;
            color: var(--ink-soft)
        }
        .help-hero h1 .grad {
            background: linear-gradient(90deg, #7c5ce7, #8b6cf6, #f472b6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text
        }
        .help-hero p {
            color: var(--muted);
            font-size: 1rem;
            max-width: 520px;
            margin: 0 auto 32px;
            line-height: 1.8
        }
        .help-search {
            display: flex;
            align-items: center;
            max-width: 460px;
            margin: 0 auto;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all .3s ease
        }
        .help-search:focus-within {
            border-color: rgba(124, 92, 231, .3);
            box-shadow: var(--shadow-md)
        }
        .help-search input {
            flex: 1;
            padding: 14px 18px;
            border: none;
            outline: none;
            font-family: var(--font-body);
            font-size: .9rem;
            color: var(--ink);
            background: transparent
        }
        .help-search input::placeholder {
            color: var(--muted-light)
        }
        .help-search button {
            padding: 14px 20px;
            background: linear-gradient(135deg, #7c5ce7, #8b6cf6);
            border: none;
            color: #fff;
            font-weight: 600;
            font-family: var(--font-body);
            cursor: pointer;
            font-size: .85rem;
            transition: all .3s ease
        }
        .help-search button:hover {
            background: linear-gradient(135deg, #8b6cf6, #9b7df8)
        }

        /* 快速入门卡片 */
        .quick-start {
            position: relative;
            z-index: 1;
            padding: clamp(40px, 6vh, 80px) 0
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 14px
        }
        .step-card {
            border-radius: var(--radius-lg);
            border: 1px solid var(--line);
            background: #fff;
            padding: clamp(24px, 2.5vw, 34px);
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all .35s var(--ease);
            position: relative;
            overflow: hidden
        }
        .step-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #7c5ce7, #f472b6);
            opacity: 0;
            transition: opacity .4s ease
        }
        .step-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--line-bright)
        }
        .step-card:hover::before {
            opacity: 1
        }
        .step-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            background: rgba(124, 92, 231, .06);
            border: 1px solid rgba(124, 92, 231, .08)
        }
        .step-card h3 {
            font-size: 1.05rem;
            margin-bottom: 6px;
            color: var(--ink-soft)
        }
        .step-card p {
            font-size: .82rem;
            color: var(--muted);
            line-height: 1.6
        }

        /* 分类帮助 */
        .help-categories {
            position: relative;
            z-index: 1;
            padding: clamp(50px, 7vh, 100px) 0
        }
        .cat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px
        }
        .cat-card {
            border-radius: var(--radius);
            border: 1px solid var(--line);
            background: #fff;
            padding: 22px 18px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all .3s ease;
            cursor: pointer
        }
        .cat-card:hover {
            transform: translateY(-4px);
            border-color: rgba(124, 92, 231, .2);
            box-shadow: var(--shadow-md)
        }
        .cat-emoji {
            font-size: 2rem;
            margin-bottom: 10px;
            display: block
        }
        .cat-card h4 {
            font-size: .9rem;
            margin-bottom: 4px;
            color: var(--ink-soft)
        }
        .cat-card p {
            font-size: .75rem;
            color: var(--muted);
            line-height: 1.4
        }

        /* 热门问题 */
        .faq-section {
            position: relative;
            z-index: 1;
            padding: clamp(50px, 7vh, 100px) 0
        }
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            max-width: 1000px;
            margin: 0 auto
        }
        .faq-item {
            border-radius: var(--radius);
            border: 1px solid var(--line);
            background: #fff;
            padding: 20px 22px;
            box-shadow: var(--shadow-sm);
            transition: all .3s ease
        }
        .faq-item:hover {
            border-color: var(--line-bright);
            box-shadow: var(--shadow-md)
        }
        .faq-item h4 {
            font-size: .9rem;
            font-family: var(--font-body);
            font-weight: 600;
            letter-spacing: 0;
            margin-bottom: 6px;
            color: var(--ink-soft)
        }
        .faq-item p {
            font-size: .8rem;
            color: var(--muted);
            line-height: 1.65
        }

        /* 教程亮点 */
        .tutorial-highlight {
            position: relative;
            z-index: 1;
            padding: clamp(50px, 7vh, 90px) 0
        }
        .highlight-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px
        }
        .highlight-card {
            border-radius: var(--radius-lg);
            border: 1px solid var(--line);
            background: #fff;
            padding: clamp(26px, 3vw, 38px);
            display: flex;
            gap: 20px;
            align-items: center;
            box-shadow: var(--shadow-sm);
            transition: all .3s ease
        }
        .highlight-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
            border-color: var(--line-bright)
        }
        .hl-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: rgba(124, 92, 231, .06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            flex-shrink: 0
        }
        .hl-content h4 {
            font-size: 1rem;
            margin-bottom: 4px;
            color: var(--ink-soft)
        }
        .hl-content p {
            font-size: .82rem;
            color: var(--muted);
            line-height: 1.5
        }

        /* CTA */
        .help-cta {
            position: relative;
            z-index: 1;
            padding: clamp(50px, 7vh, 80px) 0
        }
        .cta-inner {
            border-radius: var(--radius-xl);
            border: 1px solid var(--line);
            background: #fff;
            padding: clamp(36px, 4vw, 56px);
            text-align: center;
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden
        }
        .cta-inner::before {
            content: '';
            position: absolute;
            top: -100px;
            left: 50%;
            width: 350px;
            height: 350px;
            transform: translateX(-50%);
            background: radial-gradient(circle, rgba(124, 92, 231, .04), rgba(244, 114, 182, .02), transparent 55%);
            pointer-events: none
        }
        .cta-inner h3 {
            font-size: clamp(1.5rem, 2.8vw, 2rem);
            margin-bottom: 8px;
            color: var(--ink-soft)
        }
        .cta-inner p {
            color: var(--muted);
            font-size: .9rem;
            margin-bottom: 24px
        }
        .btn-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 26px;
            border-radius: 8px;
            background: linear-gradient(135deg, #7c5ce7, #8b6cf6);
            color: #fff;
            font-weight: 700;
            font-size: .88rem;
            font-family: var(--font-body);
            border: none;
            cursor: pointer;
            transition: all .3s ease
        }
        .btn-glow:hover {
            background: linear-gradient(135deg, #8b6cf6, #9b7df8);
            box-shadow: 0 8px 28px rgba(124, 92, 231, .28)
        }

        /* 页脚 */
        .footer {
            position: relative;
            z-index: 1;
            border-top: 1px solid var(--line);
            padding: 50px 0 24px;
            background: #fff
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2.5fr 1fr 1fr 1fr;
            gap: clamp(20px, 3.5vw, 48px);
            margin-bottom: 36px
        }
        .footer-brand p {
            color: var(--muted);
            font-size: .84rem;
            max-width: 260px;
            line-height: 1.7;
            margin-top: 12px
        }
        .footer-col h4 {
            font-family: var(--font-mono);
            font-size: .72rem;
            font-weight: 500;
            color: var(--ink-soft);
            margin-bottom: 16px;
            letter-spacing: .1em;
            text-transform: uppercase
        }
        .footer-col li {
            margin-bottom: 9px
        }
        .footer-col a {
            color: var(--muted);
            font-size: .84rem;
            transition: all .3s var(--ease)
        }
        .footer-col a:hover {
            color: #7c5ce7;
            padding-left: 3px
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid rgba(124, 92, 231, .06);
            font-size: .74rem;
            color: var(--muted);
            font-family: var(--font-mono)
        }

        /* 滚动动画 */
        .reveal {
            opacity: 0;
            transform: translateY(36px);
            transition: all .7s var(--ease)
        }
        .reveal.show {
            opacity: 1;
            transform: translateY(0)
        }
        .reveal-d1 {
            transition-delay: .1s
        }
        .reveal-d2 {
            transition-delay: .2s
        }
        .reveal-d3 {
            transition-delay: .3s
        }
        .reveal-d4 {
            transition-delay: .4s
        }
        .reveal-d5 {
            transition-delay: .5s
        }

        /* 响应式 */
        @media(max-width:1024px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr
            }
            .cat-grid {
                grid-template-columns: repeat(2, 1fr)
            }
            .faq-grid {
                grid-template-columns: 1fr
            }
            .highlight-grid {
                grid-template-columns: 1fr
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr
            }
        }
        @media(max-width:768px) {
            .nav-right a:not(.nav-download) {
                display: none
            }
            .mobile-btn {
                display: block
            }
            .steps-grid {
                grid-template-columns: 1fr
            }
            .cat-grid {
                grid-template-columns: 1fr 1fr
            }
            .footer-grid {
                grid-template-columns: 1fr
            }
            .footer-bottom {
                flex-direction: column;
                gap: 6px;
                text-align: center
            }
            .faq-grid {
                grid-template-columns: 1fr
            }
        }
        @media(max-width:480px) {
            .cat-grid {
                grid-template-columns: 1fr
            }
            .help-hero h1 {
                font-size: 1.8rem
            }
        }