:root {
            --prime: #e0684d;
            --prime-soft: rgba(224, 104, 77, 0.1);
            --void: #1d1d1f;
            --ghost: #86868b;
            --chalk: #ffffff;
            --mist: #f5f5f7;
            --radius: 14px;
            --shadow: 0 10px 30px rgba(0,0,0,0.08);
            --transition: 0.35s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--void);
            line-height: 1.7;
            background-color: var(--chalk);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* 导航栏复用与修正 */
        .crest {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            z-index: 1000;
            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;
            flex-wrap: wrap;
        }

        .glyph {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .glyph img {
            height: 32px;
            width: auto;
        }

        .loom {
            display: flex;
            align-items: center;
            gap: 32px;
            flex-wrap: wrap;
        }

        .dock {
            text-decoration: none;
            color: var(--void);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }

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

        .dock.active {
            color: var(--prime);
        }

        .dock.active::after {
            content: "";
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 4px;
            height: 4px;
            background: var(--prime);
            border-radius: 50%;
        }

        /* 主体内容容器 */
        .pith-veil {
            width: 100%;
            padding-top: 64px;
        }

        /* 1. 全能PDF转换中心 (Intro) */
        .vista-vellum {
            min-height: 640px;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            padding: 80px 24px;
            flex-wrap: wrap;
        }

        .cage-flow {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 60px;
            flex-wrap: wrap;
        }

        .folio-float {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

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

        .rune-base {
            font-size: 18px;
            color: var(--ghost);
            margin-bottom: 40px;
            max-width: 540px;
        }

        .etch-prime {
            display: inline-flex;
            align-items: center;
            background: var(--prime);
            color: var(--chalk);
            padding: 18px 48px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 8px 20px rgba(224, 104, 77, 0.3);
        }

        .etch-prime:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(224, 104, 77, 0.4);
        }

        .lens-float {
            flex: 1.2;
            min-width: 320px;
            position: relative;
        }

        .lens-float img {
            width: 100%;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        /* 2. 像编辑文档一样编辑PDF (Detail) */
        .stage-grid {
            padding: 100px 24px;
            background: var(--chalk);
        }

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

        .gist-herd h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .herd-folio {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }

        .slab-static {
            flex: 1;
            min-width: 300px;
            padding: 40px;
            background: var(--mist);
            border-radius: var(--radius);
            transition: var(--transition);
            border: 1px solid rgba(0,0,0,0.02);
            word-break: break-word;
        }

        .slab-static:hover {
            background: var(--chalk);
            box-shadow: var(--shadow);
            transform: translateY(-5px);
        }

        .pips-solid {
            width: 56px;
            height: 56px;
            background: var(--prime);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            color: var(--chalk);
        }

        .gist-slab {
            font-size: 22px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .rune-slab {
            color: var(--ghost);
            font-size: 15px;
        }

        /* 3. 安全保障与云端存储 (Context) */
        .vellum-secure {
            padding: 100px 24px;
            background: #fafafa;
        }

        .cage-dual {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 80px;
            flex-wrap: wrap-reverse;
        }

        .lens-secure {
            flex: 1;
            min-width: 320px;
        }

        .lens-secure img {
            width: 100%;
            border-radius: var(--radius);
            filter: grayscale(0.1);
        }

        .pith-secure {
            flex: 1;
            min-width: 320px;
        }

        .twig-flow {
            list-style: none;
            margin-top: 32px;
        }

        .twig-flow li {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            margin-bottom: 20px;
            font-size: 16px;
            color: var(--void);
        }

        .pips-check {
            width: 20px;
            height: 20px;
            color: var(--prime);
            flex-shrink: 0;
            margin-top: 4px;
        }

        /* 页脚区域 */
        .keel-spine {
            background: var(--chalk);
            padding: 80px 24px 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
        }

        .rim-cage {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
        }

        .pith-brand {
            flex: 1.5;
            min-width: 240px;
        }

        .gist-brand {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--void);
        }

        .rune-brand {
            color: var(--ghost);
            font-size: 14px;
            max-width: 300px;
        }

        .loom-keel {
            flex: 2;
            display: flex;
            gap: 60px;
            flex-wrap: wrap;
        }

        .band-twig {
            min-width: 120px;
        }

        .gist-twig {
            font-size: 14px;
            font-weight: 600;
            color: var(--void);
            margin-bottom: 20px;
            text-transform: uppercase;
        }

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

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

        .keel-base {
            max-width: 1200px;
            margin: 40px auto 0;
            padding-top: 30px;
            border-top: 1px solid rgba(0,0,0,0.03);
            text-align: center;
            font-size: 13px;
            color: var(--ghost);
        }

        @media (max-width: 768px) {
            .loom {
                display: none;
            }
            .vista-vellum {
                padding: 60px 20px;
                text-align: center;
            }
            .rune-base {
                margin-left: auto;
                margin-right: auto;
            }
            .cage-flow, .cage-dual {
                flex-direction: column;
            }
            .slab-static {
                min-width: 100%;
            }
        }

.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; }}