/* CSS Variables - Inherited from Homepage Visual Family */
        :root {
            --bg-deep: #0a0c10;
            --bg-sub: #11141a;
            --bg-surface: #1a1e27;
            --brand: #a0e514;
            --text-main: #f0f2f5;
            --text-muted: #9ba1ad;
            --shadow-base: 0 4px 24px rgba(0, 0, 0, 0.4);
            --shadow-brand: 0 0 32px rgba(160, 229, 20, 0.2);
            --radius: 6px;
            --transition: all 0.15s ease;
        }

        /* Base Reset & Typography */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

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

        /* Utility Classes */
        .shell {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 5vw;
        }

        /* Mandatory Flex/Grid Rules */
        .array, .batch, .band, .shell {
            display: flex;
            flex-wrap: wrap;
        }
        
        .array > *, .batch > *, .band > *, .shell > * {
            min-width: 0;
        }

        /* Mandatory Header Styles (Direct Copy & Active State Adjustment) */
        .apex {
            background-color: var(--bg-deep);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .apex .shell {
            justify-content: space-between;
            align-items: center;
            padding-top: 16px;
            padding-bottom: 16px;
        }

        .paw img {
            height: 28px;
            display: block;
        }

        .pinyin {
            gap: 32px;
            align-items: center;
        }

        .node {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }

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

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

        /* Main Zone */
        .zone {
            display: flex;
            flex-direction: column;
            gap: 80px;
            padding-bottom: 100px;
        }

        /* Section 1: Hero Typography (Article) */
        .board {
            padding: 120px 0 80px;
            background: 
                radial-gradient(circle at 50% 0%, rgba(160, 229, 20, 0.08) 0%, transparent 60%),
                var(--bg-deep);
            text-align: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.02);
            position: relative;
        }

        .board::after {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background-image: 
                linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
            opacity: 0.5;
        }

        .char-overline {
            font-size: 0.875rem;
            color: var(--brand);
            letter-spacing: 4px;
            text-transform: uppercase;
            margin-bottom: 24px;
            display: block;
            font-weight: 600;
            position: relative;
            z-index: 2;
        }

        .topic-huge {
            font-size: clamp(3rem, 8vw, 5.5rem);
            font-weight: 900;
            line-height: 1.1;
            letter-spacing: -2px;
            color: var(--text-main);
            margin-bottom: 24px;
            position: relative;
            z-index: 2;
            white-space: normal;
        }

        .char-desc {
            font-size: clamp(1.125rem, 2vw, 1.25rem);
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.8;
            position: relative;
            z-index: 2;
        }

        .band-tags {
            justify-content: center;
            gap: 16px;
            position: relative;
            z-index: 2;
        }

        .idiom {
            background: var(--bg-surface);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 12px 24px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: var(--shadow-base);
        }

        .idiom svg {
            width: 16px;
            height: 16px;
            fill: var(--brand);
        }

        /* Section Title Common */
        .topic-pad {
            font-size: clamp(2rem, 4vw, 2.5rem);
            font-weight: 800;
            letter-spacing: -1px;
            color: var(--text-main);
            margin-bottom: 48px;
            display: flex;
            align-items: center;
            gap: 16px;
            white-space: normal;
        }

        .topic-pad::before {
            content: '';
            display: block;
            width: 24px;
            height: 4px;
            background: var(--brand);
            border-radius: 2px;
        }

        /* Section 2: Symbol Dictionary (Aside) */
        .dock .batch {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .lexi-art {
            background: var(--bg-surface);
            border: 1px solid #2a313e;
            border-radius: var(--radius);
            padding: 32px;
            box-shadow: inset 0 0 40px rgba(0,0,0,0.2);
            transition: var(--transition);
        }

        .lexi-art:hover {
            border-color: rgba(160, 229, 20, 0.3);
            box-shadow: inset 0 0 40px rgba(0,0,0,0.2), var(--shadow-base);
            transform: translateY(-4px);
        }

        .topic-sub {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            white-space: normal;
        }

        .glyph-tag {
            background: rgba(160, 229, 20, 0.1);
            color: var(--brand);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 1px;
        }

        .spell-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 12px;
        }

        .cell-symbol {
            background: var(--bg-sub);
            border: 1px solid transparent;
            border-radius: 4px;
            aspect-ratio: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            color: var(--text-muted);
            cursor: pointer;
            transition: var(--transition);
        }

        .cell-symbol:hover {
            background: rgba(160, 229, 20, 0.1);
            color: var(--brand);
            border-color: rgba(160, 229, 20, 0.3);
        }

        /* Section 3: Kaomoji (Div) */
        .cloud .batch {
            gap: 16px;
        }

        .phrase {
            background: var(--bg-surface);
            border: 1px solid #2a313e;
            padding: 16px 24px;
            border-radius: 40px;
            font-family: monospace;
            font-size: 1.125rem;
            color: var(--text-muted);
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .phrase:hover {
            background: var(--brand);
            color: var(--bg-deep);
            border-color: var(--brand);
            box-shadow: var(--shadow-brand);
            transform: scale(1.05);
        }

        /* Section 4: Shortcut Tips (Section) */
        .root .batch {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 24px;
        }

        .gram {
            background: #000;
            border-left: 4px solid var(--brand);
            border-radius: 0 var(--radius) var(--radius) 0;
            padding: 32px;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .band-cmd {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 16px;
            border-bottom: 1px dashed #2a313e;
            flex-wrap: wrap;
            gap: 16px;
        }

        .band-cmd:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

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

        .key {
            display: inline-block;
            padding: 6px 12px;
            background: #2a313e;
            border-radius: 4px;
            box-shadow: 0 4px 0 #11141a;
            color: var(--text-main);
            font-family: monospace;
            font-size: 0.875rem;
            font-weight: bold;
            margin: 0 4px;
            transition: var(--transition);
        }

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

        /* Footer */
        .heel {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 60px 0;
            background: var(--bg-deep);
            text-align: center;
        }

        .heel .char {
            color: var(--text-muted);
            font-size: 0.875rem;
            margin-bottom: 16px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .pinyin {
                display: none; /* Simplification for mobile [role="navigation"] in this context, assuming hamburger in real env, but strictly following HTML structure */
            }
            .board {
                padding: 80px 0 40px;
            }
            .dock .batch, .root .batch {
                grid-template-columns: 1fr;
            }
            .topic-huge {
                font-size: 2.5rem;
            }
        }

.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;
            }}