:root {
            --brand: #e0684d;
            --brand-soft: rgba(224, 104, 77, 0.1);
            --bg: #ffffff;
            --surface: #f5f5f7;
            --text-main: #1d1d1f;
            --text-dim: #86868b;
            --radius: 14px;
            --shadow: 0 10px 30px rgba(0,0,0,0.08);
            --transition: 0.35s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            line-height: 1.7;
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        /* 强制复用首页导航栏风格 */
        .crest {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .trail {
            max-width: 1200px;
            margin: 0 auto;
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
        }

        .glyph {
            height: 32px;
            display: flex;
            align-items: center;
        }

        .glyph img {
            height: 100%;
        }

        .loom {
            display: flex;
            gap: 32px;
        }

        .dock {
            text-decoration: none;
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }

        .dock:hover {
            color: var(--brand);
        }

        .dock.active {
            color: var(--brand);
            font-weight: 600;
        }

        /* 主体内容结构 */
        .pith {
            width: 100%;
            display: flex;
            flex-direction: column;
        }

        /* 1. 多端同步（acquire） */
        .vista {
            padding: 80px 24px;
            background: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .veil-wide {
            max-width: 1200px;
            width: 100%;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 60px;
        }

        .clue-lead {
            flex: 1;
            min-width: 320px;
        }

        .gist-pith {
            font-size: clamp(32px, 4vw, 48px);
            line-height: 1.2;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .rune-pith {
            font-size: 18px;
            color: var(--text-dim);
            margin-bottom: 40px;
            max-width: 500px;
            word-break: break-word;
        }

        .lens-matrix {
            flex: 1.2;
            min-width: 320px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            background: #fff;
        }

        .lens-matrix img {
            width: 100%;
            display: block;
            transition: transform 0.8s cubic-bezier(0.2, 0, 0.2, 1);
        }

        .lens-matrix:hover img {
            transform: scale(1.03);
        }

        /* 平台矩阵网格 */
        .herd-platforms {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 20px;
        }

        .folio-platform {
            flex: 1;
            min-width: 140px;
            background: var(--bg);
            padding: 24px;
            border-radius: var(--radius);
            border: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            transition: var(--transition);
            text-decoration: none;
            color: inherit;
        }

        .folio-platform:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
            border-color: var(--brand);
        }

        .pips-svg {
            width: 40px;
            height: 40px;
            margin: 0 auto 16px;
            color: var(--brand);
        }

        .gist-sub {
            font-weight: 600;
            font-size: 16px;
            margin-bottom: 4px;
        }

        /* 2. 版本详情（comparison） */
        .vellum-details {
            padding: 100px 24px;
            background-color: var(--bg);
        }

        .veil-center {
            max-width: 1100px;
            margin: 0 auto;
        }

        .gist-center {
            text-align: center;
            margin-bottom: 60px;
        }

        .band-info {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            justify-content: center;
        }

        .slab-spec {
            flex: 1;
            min-width: 300px;
            padding: 40px;
            border-radius: var(--radius);
            background: var(--surface);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .slab-spec:hover {
            background: var(--bg);
            box-shadow: var(--shadow);
        }

        .twig-version {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--brand);
        }

        .rune-spec {
            font-size: 14px;
            color: var(--text-dim);
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .etch-prime {
            background: var(--brand);
            color: #ffffff;
            padding: 14px 28px;
            border-radius: 30px;
            font-weight: 600;
            text-align: center;
            text-decoration: none;
            transition: var(--transition);
            border: none;
            display: inline-block;
        }

        .etch-prime:hover {
            filter: brightness(1.1);
            transform: scale(1.02);
        }

        /* 3. 安装指南（steps） */
        .stage-guide {
            padding: 80px 24px;
            background: var(--surface);
        }

        .herd-steps {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: space-between;
            max-width: 1000px;
            margin: 0 auto;
            counter-reset: steps-counter;
        }

        .twig-step {
            flex: 1;
            min-width: 260px;
            position: relative;
            padding-left: 60px;
        }

        .twig-step::before {
            counter-increment: steps-counter;
            content: counter(steps-counter);
            position: absolute;
            left: 0;
            top: 0;
            width: 44px;
            height: 44px;
            background: var(--brand);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
        }

        .gist-tiny {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .rune-tiny {
            font-size: 14px;
            color: var(--text-dim);
        }

        /* 页脚区域 */
        .keel-rim {
            background: #1d1d1f;
            color: #f5f5f7;
            padding: 80px 24px 40px;
        }

        .veil-keel {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 60px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 60px;
        }

        .twig-rim {
            flex: 1;
            min-width: 180px;
        }

        .gist-rim {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
            color: #fff;
        }

        .dock-rim {
            display: block;
            color: #86868b;
            text-decoration: none;
            font-size: 14px;
            margin-bottom: 12px;
            transition: var(--transition);
        }

        .dock-rim:hover {
            color: #fff;
        }

        .spine-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 12px;
            color: #86868b;
        }

        .brand-name {
            font-weight: 700;
            color: #fff;
            font-size: 16px;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .loom {
                display: none; /* 简化移动端，实际项目中会使用汉堡菜单 */
            }
            .gist-pith {
                font-size: 32px;
            }
            .veil-wide {
                flex-direction: column;
            }
            .band-info {
                flex-direction: column;
            }
            .twig-step {
                padding-left: 0;
                padding-top: 60px;
                text-align: center;
            }
            .twig-step::before {
                left: 50%;
                transform: translateX(-50%);
            }
        }

.trail-crest{
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

.trail-crest .trail-trail{
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 40px;
            height: 72px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

.trail-crest .trail-glyph{
            height: 32px;
            display: flex;
            align-items: center;
        }

.trail-crest .trail-glyph img{
            height: 100%;
            width: auto;
        }

.trail-crest .trail-loom{
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
        }

.trail-crest .trail-dock{
            text-decoration: none;
            color: #1d1d1f;
            font-size: 15px;
            font-weight: 500;
            transition: 0.35s ease;
            position: relative;
            padding: 4px 0;
        }

.trail-crest .trail-dock:hover{
            color: #e0684d;
        }

.trail-crest .trail-dock.active{
            color: #e0684d;
        }

.trail-crest .trail-dock.active::after{
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: #e0684d;
            border-radius: 2px;
        }

@media (max-width: 768px){.trail-crest .trail-trail{ padding: 0 20px; }

.trail-crest .trail-loom{ display: none; }}

.trail-crest {
    background: rgb(255, 255, 255);
    background-image: none;
}

.spine-keel {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    word-break: keep-all;
    color: var(--ink);
}
.spine-keel,
.spine-keel *,
.spine-keel *::before,
.spine-keel *::after {
    box-sizing: border-box;
}

.spine-keel nav,
.spine-keel div,
.spine-keel section,
.spine-keel article,
.spine-keel aside,
.spine-keel p,
.spine-keel h1,
.spine-keel h2,
.spine-keel h3,
.spine-keel h4,
.spine-keel h5,
.spine-keel h6,
.spine-keel a {
    margin: 0;
    padding: 0;
    font: inherit;
    color: inherit;
    letter-spacing: inherit;
    line-height: inherit;
}

.spine-keel p,
.spine-keel h1,
.spine-keel h2,
.spine-keel h3,
.spine-keel h4,
.spine-keel h5,
.spine-keel h6 {
    text-decoration: none;
}

.spine-keel img {
    display: block;
    max-width: 100%;
    height: auto;
    border: 0;
}

.spine-keel {
    box-shadow: none;
    filter: none;
    text-shadow: none;
    background-image: none;
    border-top: none;
    border-left: none;
    border-right: none;
    outline: none;
}

.spine-keel a,
.spine-keel a:hover,
.spine-keel a:focus,
.spine-keel a:active {
    background: transparent;
    box-shadow: none;
    outline: none;
    text-decoration: none;
}

.spine-keel .spine-rune-intro{
            color: #86868b;
            max-width: 700px;
            margin: 0 auto;
        }

.spine-keel{
            padding: 80px 40px 40px;
            background: #ffffff;
            border-top: 1px solid #f5f5f7;
        }

.spine-keel .spine-rim-pith{
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 60px;
        }

.spine-keel .spine-veil-brand{
            flex: 1.5;
            min-width: 200px;
        }

.spine-keel .spine-gist-brand{
            font-size: 24px;
            font-weight: 700;
            color: #e0684d;
            margin-bottom: 20px;
        }

.spine-keel .spine-herd-links{
            flex: 3;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

.spine-keel .spine-veil-column{
            flex: 1;
            min-width: 140px;
        }

.spine-keel .spine-gist-keel{
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

.spine-keel .spine-twig-keel{
            list-style: none;
        }

.spine-keel .spine-dock-keel{
            display: block;
            text-decoration: none;
            color: #86868b;
            font-size: 14px;
            margin-bottom: 12px;
            transition: 0.35s ease;
        }

.spine-keel .spine-dock-keel:hover{
            color: #e0684d;
        }

.spine-keel .spine-spine-bottom{
            max-width: 1300px;
            margin: 60px auto 0;
            padding-top: 30px;
            border-top: 1px solid #f5f5f7;
            text-align: center;
            font-size: 13px;
            color: #86868b;
        }

@media (max-width: 768px){.spine-keel .spine-rim-pith{ flex-direction: column; gap: 40px; }}