/* S-Class · 模块目录页（与首页学术 / Academoo 风格统一） */
:root {
    --hub-ink: var(--sc-gray-900, #111827);
    --hub-muted: var(--sc-gray-600, #4b5563);
    --hub-teal: #0ea5e9;
    --hub-line: #000;
    --hub-surface: transparent;
    --hub-max: 72rem;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.sclass-hub {
    margin: 0;
    font-family: var(--sc-font-body, "Quicksand", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif);
    color: var(--hub-ink);
    background: transparent;
    line-height: 1.6;
    min-height: 100dvh;
}
.hub-wrap {
    max-width: var(--hub-max);
    margin: 0 auto;
    padding: 28px 20px 80px;
}
.hub-kicker {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0 0 12px;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    background: var(--sc-yellow, #ffe600);
    color: var(--hub-ink);
    border: 2px solid #000;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}
.hub-wrap h1 {
    margin: 0 0 8px;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: clamp(1.9rem, 4vw, 2.7rem);
    font-weight: 600;
    letter-spacing: 0.01em;
    line-height: 1.15;
}
.hub-lead {
    margin: 0 0 1.75rem;
    color: var(--hub-muted);
    font-size: 1.02rem;
    max-width: 40em;
    font-weight: 600;
}
.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.1rem;
}
.hub-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 1.15rem 1.15rem 1.05rem;
    background: #fff;
    border: 3px solid #000;
    border-radius: 1.35rem;
    text-decoration: none;
    color: inherit;
    box-shadow: 4px 4px 0 #000;
    transition: transform .15s ease, box-shadow .15s ease;
}
.hub-card:hover {
    transform: translate(-3px, -3px);
    box-shadow: 7px 7px 0 #000;
}
.hub-card:active {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 #000;
}
.hub-card .no {
    align-self: flex-start;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--hub-ink);
    background: var(--sc-sky-100, #e0f2fe);
    border: 2px solid #000;
    border-radius: 999px;
    padding: 0.12rem 0.55rem;
}
.hub-grid .hub-card:nth-child(6n+1) .no { background: var(--sc-yellow, #ffe600); }
.hub-grid .hub-card:nth-child(6n+2) .no { background: var(--sc-blue, #7dd3fc); }
.hub-grid .hub-card:nth-child(6n+3) .no { background: var(--sc-pink, #f9a8d4); }
.hub-grid .hub-card:nth-child(6n+4) .no { background: var(--sc-green, #86efac); }
.hub-grid .hub-card:nth-child(6n+5) .no { background: var(--sc-orange, #fb923c); }
.hub-grid .hub-card:nth-child(6n) .no { background: var(--sc-purple, #c084fc); }
.hub-card h2,
.hub-card h3 {
    margin: 0;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: 1.12rem;
    font-weight: 600;
    letter-spacing: 0;
}
.hub-card h2 small {
    display: block;
    margin-top: 0.28rem;
    font-family: var(--sc-font-body, "Noto Sans SC", "PingFang SC", sans-serif) !important;
    font-size: 0.78rem !important;
    font-weight: 700 !important;
    line-height: 1.4;
    letter-spacing: 0 !important;
    text-transform: none !important;
    color: var(--hub-ink) !important;
}
.hub-card p {
    margin: 0;
    color: var(--hub-muted);
    font-size: 0.86rem;
    line-height: 1.5;
    font-weight: 600;
}
.hub-unit {
    background: #fff;
    border: 3px solid #000;
    border-radius: 1.35rem;
    padding: 1rem 1.15rem 0.95rem;
    box-shadow: 4px 4px 0 #000;
}
.hub-unit header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}
.hub-unit h2 {
    margin: 0;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: 1.15rem;
    font-weight: 600;
}
.hub-unit .meta {
    color: var(--hub-muted);
    font-size: 0.8rem;
    font-weight: 600;
}
.hub-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.hub-links a {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 4px 12px;
    border-radius: 999px;
    background: #fff;
    color: #111827;
    text-decoration: none;
    font-family: var(--sc-font-display, "Fredoka", "Noto Sans SC", sans-serif);
    font-size: 0.8rem;
    font-weight: 700;
    border: 2px solid #000;
    box-shadow: 2px 2px 0 #000;
}
.hub-links a:hover {
    background: var(--sc-yellow, #ffe600);
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 #000;
}
.hub-stack {
    display: grid;
    gap: 14px;
}
@media (max-width: 640px) {
    .hub-wrap { padding: 20px 14px 64px; }
    .hub-grid { grid-template-columns: 1fr; }
}