:root {
        --bg-deep: #0a0c10;
        --bg-sub: #11141a;
        --bg-surface: #1a1e27;
        --bg-surface-hover: #222733;
        --brand: #a0e514;
        --brand-dim: rgba(160, 229, 20, 0.15);
        --text-main: #f0f2f5;
        --text-muted: #9ba1ad;
        --border: #2a313e;
        --radius: 8px;
        --radius-lg: 12px;
        --shadow-base: 0 4px 24px rgba(0, 0, 0, 0.4);
        --shadow-brand: 0 0 32px rgba(160, 229, 20, 0.2);
        --transition: all 0.15s ease;
    }

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

    body {
        background-color: var(--bg-deep);
        color: var(--text-main);
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
        overflow-x: hidden;
    }

    /* Typography */
    .topic {
        color: var(--text-main);
        font-weight: 900;
        line-height: 1.3;
        letter-spacing: -0.5px;
        white-space: normal;
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .topic-huge {
        font-size: clamp(2.5rem, 5vw, 4rem);
        margin-bottom: 24px;
        background: linear-gradient(135deg, #fff 0%, #a0a5b0 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .topic-large {
        font-size: clamp(2rem, 3.5vw, 2.5rem);
        margin-bottom: 20px;
    }

    .topic-medium {
        font-size: 1.25rem;
        margin-bottom: 12px;
    }

    .char {
        color: var(--text-muted);
        word-break: break-word;
        overflow-wrap: break-word;
        font-size: 1.1rem;
        line-height: 1.7;
    }

    a {
        text-decoration: none;
        color: inherit;
        transition: var(--transition);
    }

    img, svg {
        display: block;
        max-width: 100%;
        height: auto;
    }

    /* Layout & Utilities */
    .shell {
        max-width: 1320px;
        margin: 0 auto;
        padding: 0 5vw;
    }

    .pad {
        padding-top: 80px;
        padding-bottom: 80px;
    }

    .batch {
        display: flex;
        flex-wrap: wrap;
        gap: 24px;
    }

    .cell {
        min-width: 0;
    }

    .array {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    /* Nav (Strictly Reused) */
    .apex {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(10, 12, 16, 0.8);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
    }

    .apex .shell {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 72px;
    }

    .paw {
        display: flex;
        align-items: center;
    }

    .paw img {
        height: 32px;
    }

    .pinyin {
        display: flex;
        gap: 32px;
        flex-direction: row; /* Override generic array for [role="navigation"] */
    }

    .node {
        color: var(--text-muted);
        font-size: 1rem;
        font-weight: 500;
    }

    .node:hover {
        color: var(--text-main);
    }

    .node.active {
        color: var(--brand);
    }

    @media (max-width: 768px) {
        .pinyin {
            display: none; /* Simplified mobile [role="navigation"] behavior for this scope */
        }
    }

    /* Components */
    .tap {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background-color: var(--brand);
        color: var(--bg-deep);
        font-weight: 700;
        padding: 16px 36px;
        border-radius: var(--radius);
        box-shadow: var(--shadow-brand);
        border: 1px solid transparent;
        font-size: 1.1rem;
        cursor: pointer;
    }

    .tap:hover {
        transform: translateY(-2px);
        box-shadow: 0 12px 32px rgba(160, 229, 20, 0.3);
        background-color: #aef026;
    }

    .lexi {
        background: var(--bg-surface);
        border-radius: var(--radius-lg);
        padding: 40px;
        border: 1px solid var(--border);
        box-shadow: var(--shadow-base);
        transition: var(--transition);
        display: flex;
        flex-direction: column;
    }

    .lexi:hover {
        transform: translateY(-5px);
        border-color: rgba(160, 229, 20, 0.3);
        box-shadow: inset 0 0 40px rgba(0,0,0,0.5), var(--shadow-base);
    }

    .gram {
        display: inline-flex;
        align-items: center;
        padding: 6px 16px;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 100px;
        font-size: 0.9rem;
        color: var(--text-main);
    }

    .glyph {
        width: 24px;
        height: 24px;
        fill: currentColor;
    }

    .glyph-accent {
        color: var(--brand);
    }

    /* Section: Intro (Hero) */
    .board {
        position: relative;
        overflow: hidden;
        background: radial-gradient(circle at 80% 20%, var(--brand-dim) 0%, transparent 50%),
                    linear-gradient(180deg, transparent 0%, var(--bg-sub) 100%);
    }

    .board-inner {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 60px;
    }

    .board-char {
        flex: 1 1 400px;
        min-width: 0;
        z-index: 2;
    }

    .board-visual {
        flex: 1 1 500px;
        min-width: 0;
        position: relative;
        display: flex;
        justify-content: center;
        align-items: center;
        perspective: 1000px;
    }

    /* Abstract Keyboard Art (CSS ONLY) */
    .art-keys {
        width: 100%;
        max-width: 500px;
        background: var(--bg-surface);
        border: 1px solid var(--border);
        border-radius: 16px;
        padding: 24px;
        box-shadow: 0 30px 60px rgba(0,0,0,0.6), inset 0 2px 0 rgba(255,255,255,0.05);
        transform: rotateX(15deg) rotateY(-10deg);
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .art-row {
        display: flex;
        gap: 8px;
        justify-content: center;
    }

    .art-key {
        height: 48px;
        background: var(--bg-deep);
        border-radius: 6px;
        border: 1px solid rgba(255,255,255,0.05);
        border-bottom-width: 3px;
        border-bottom-color: rgba(0,0,0,0.8);
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
        position: relative;
        overflow: hidden;
    }

    .art-key::after {
        content: '';
        position: absolute;
        inset: 0;
        background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,0.02) 100%);
    }

    .art-key.w-1 { flex: 1; }
    .art-key.w-2 { flex: 1.5; }
    .art-key.w-3 { flex: 2; }
    .art-key.w-space { flex: 6; background: linear-gradient(90deg, var(--bg-deep), #161a22, var(--bg-deep)); }
    
    .art-key.accent {
        background: rgba(160, 229, 20, 0.1);
        border-color: rgba(160, 229, 20, 0.3);
        border-bottom-color: rgba(160, 229, 20, 0.1);
        box-shadow: 0 0 15px rgba(160, 229, 20, 0.2);
    }

    /* Section: Detail (Gallery) */
    .cloud {
        background-color: var(--bg-sub);
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
    }

    .cloud-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 60px;
        align-items: center;
    }

    .cloud-media {
        border-radius: var(--radius-lg);
        overflow: hidden;
        box-shadow: var(--shadow-base);
        position: relative;
    }
    
    .cloud-media::before {
        content: '';
        position: absolute;
        inset: 0;
        border: 1px solid rgba(255,255,255,0.1);
        border-radius: var(--radius-lg);
        pointer-events: none;
    }

    .cloud-media img {
        width: 100%;
        display: block;
        transition: transform 0.5s ease;
    }

    .cloud-media:hover img {
        transform: scale(1.03);
    }

    .tag-batch {
        margin-top: 32px;
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
    }

    /* Section: Capability (Customization) */
    .zone {
        background: var(--bg-deep);
    }

    .engine-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 32px;
        margin-top: 48px;
    }

    .engine-cell {
        display: flex;
        gap: 20px;
        align-items: flex-start;
    }

    .engine-glyph {
        width: 56px;
        height: 56px;
        border-radius: 12px;
        background: rgba(160, 229, 20, 0.1);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        border: 1px solid rgba(160, 229, 20, 0.2);
    }

    .engine-char .topic-medium {
        margin-bottom: 8px;
    }

    /* Footer */
    .heel {
        background: var(--bg-sub);
        padding: 60px 0 40px;
        border-top: 1px solid var(--border);
    }

    .base-grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 40px;
        margin-bottom: 40px;
    }

    .base-brand {
        flex: 1 1 240px;
        min-width: 0;
    }

    .base-links {
        display: flex;
        flex-wrap: wrap;
        gap: 60px;
    }

    .trail {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .trail-topic {
        color: var(--text-main);
        font-weight: 700;
        font-size: 1.1rem;
    }

    .trail a {
        color: var(--text-muted);
        font-size: 0.95rem;
    }

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

    .root {
        border-top: 1px solid var(--border);
        padding-top: 24px;
        text-align: center;
        color: var(--text-muted);
        font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
        .board-inner { gap: 40px; }
        .cloud-grid { gap: 40px; }
    }

    @media (max-width: 768px) {
        .pad { padding-top: 60px; padding-bottom: 60px; }
        .board-char, .board-visual { flex-basis: 100%; }
        .cloud-grid { grid-template-columns: 1fr; }
        .art-keys { transform: none; }
    }

.pinyin-apex {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    word-break: break-word;
    color: var(--char-main);
}
.pinyin-apex,
.pinyin-apex *,
.pinyin-apex *::before,
.pinyin-apex *::after {
    box-sizing: border-box;
}

.pinyin-apex [role="navigation"],
.pinyin-apex div,
.pinyin-apex section,
.pinyin-apex article,
.pinyin-apex aside,
.pinyin-apex p,
.pinyin-apex h1,
.pinyin-apex h2,
.pinyin-apex h3,
.pinyin-apex h4,
.pinyin-apex h5,
.pinyin-apex h6,
.pinyin-apex a {
    margin: 0;
    padding: 0;
    font: inherit;
    color: inherit;
    letter-spacing: inherit;
    line-height: inherit;
}

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

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

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

.pinyin-apex a.pinyin-node {
    --aisite-shell-nav-padding: 6px 0;
    --aisite-shell-nav-margin: 0;
    --aisite-shell-nav-line-height: normal;
    --aisite-shell-nav-display: inline;
    --aisite-shell-nav-height: auto;
    --aisite-shell-nav-min-height: auto;
}

.pinyin-apex a.pinyin-node,
.pinyin-apex a.pinyin-node:hover,
.pinyin-apex a.pinyin-node:focus,
.pinyin-apex a.pinyin-node:active,
.pinyin-apex a.pinyin-node.active,
.pinyin-apex a.pinyin-node[aria-current="page"] {
    background: transparent;
    border: none;
    border-bottom: none;
    box-shadow: none;
    outline: none;
    text-decoration: none;
    padding: var(--aisite-shell-nav-padding, 0);
    margin: var(--aisite-shell-nav-margin, 0);
    line-height: var(--aisite-shell-nav-line-height, normal);
    display: var(--aisite-shell-nav-display, inline);
    height: var(--aisite-shell-nav-height, auto);
    min-height: var(--aisite-shell-nav-min-height, auto);
}

.pinyin-apex .pinyin-shell{
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 5vw;
        }

.pinyin-apex{
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(10, 12, 16, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid #2a313e;
        }

.pinyin-apex .pinyin-shell{
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            min-height: 72px;
            padding-top: 10px;
            padding-bottom: 10px;
        }

.pinyin-apex .pinyin-paw{
            min-width: 0;
            display: flex;
            align-items: center;
            font-weight: 800;
            font-size: 1.25rem;
            letter-spacing: 1px;
            color: #a0e514;
        }

.pinyin-apex .pinyin-paw img{
            height: 28px;
            width: auto;
            display: block;
        }

.pinyin-apex .pinyin-array{
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: center;
        }

.pinyin-apex .pinyin-node{
            min-width: 0;
            font-size: 0.95rem;
            font-weight: 500;
            color: #9ba1ad;
            padding: 6px 0;
            position: relative;
        }

.pinyin-apex .pinyin-node:hover, .pinyin-apex .pinyin-node.active{
            color: #f0f2f5;
        }

.pinyin-apex .pinyin-node.active::after{
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #a0e514;
            box-shadow: 0 0 8px #a0e514;
        }

@media (max-width: 768px){.pinyin-apex .pinyin-array{
                display: none; 
            }

.pinyin-apex .pinyin-shell{
                justify-content: center;
            }}

.pinyin-apex {
    background: rgb(10, 12, 16);
    background-image: none;
}

.base-heel {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    word-break: break-word;
    color: var(--char-main);
}
.base-heel,
.base-heel *,
.base-heel *::before,
.base-heel *::after {
    box-sizing: border-box;
}

.base-heel [role="navigation"],
.base-heel div,
.base-heel section,
.base-heel article,
.base-heel aside,
.base-heel p,
.base-heel h1,
.base-heel h2,
.base-heel h3,
.base-heel h4,
.base-heel h5,
.base-heel h6,
.base-heel a {
    margin: 0;
    padding: 0;
    font: inherit;
    color: inherit;
    letter-spacing: inherit;
    line-height: inherit;
}

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

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

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

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

.base-heel .base-char, .base-heel .base-topic{
            word-break: keep-all;
        }

.base-heel .base-shell{
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 5vw;
        }

.base-heel .base-paw{
            min-width: 0;
            display: flex;
            align-items: center;
            font-weight: 800;
            font-size: 1.25rem;
            letter-spacing: 1px;
            color: #a0e514;
        }

.base-heel .base-paw img{
            height: 28px;
            width: auto;
            display: block;
        }

.base-heel{
            background: #050608;
            padding: 64px 0 32px 0;
            border-top: 1px solid #2a313e;
        }

.base-heel .base-base-grid{
            display: grid;
            grid-template-columns: 2fr repeat(3, 1fr);
            gap: 40px;
            margin-bottom: 64px;
        }

.base-heel .base-base-brand .base-paw{
            margin-bottom: 24px;
        }

.base-heel .base-base-brand .base-char{
            color: #9ba1ad;
            font-size: 0.9rem;
            max-width: 300px;
        }

.base-heel .base-root-col .base-topic{
            font-size: 1rem;
            color: #f0f2f5;
            margin-bottom: 20px;
            font-weight: 600;
        }

.base-heel .base-root-node{
            display: block;
            color: #9ba1ad;
            margin-bottom: 12px;
            font-size: 0.9rem;
        }

.base-heel .base-root-node:hover{
            color: #a0e514;
        }

.base-heel .base-trail{
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 32px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.85rem;
        }

@media (max-width: 1024px){.base-heel .base-base-grid{
                grid-template-columns: repeat(2, 1fr);
            }}

@media (max-width: 768px){.base-heel .base-base-grid{
                grid-template-columns: 1fr;
            }}