:root {
    color-scheme: light;
    --canvas: #f5f6f8;
    --paper: #ffffff;
    --ink: #151923;
    --ink-soft: #3d4553;
    --muted: #687181;
    --line: #dfe3e9;
    --line-strong: #cbd2dc;
    --blue: #2455d6;
    --blue-soft: #eaf0ff;
    --gutter: clamp(20px, 3.4vw, 56px);
    --page-width: 1680px;
    --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --motion: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body {
    min-width: 320px;
    margin: 0;
    background: var(--canvas);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
button, input { font: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
::selection { background: #d8e2ff; color: var(--ink); }
[hidden] { display: none !important; }

.skip-link {
    position: fixed;
    z-index: 20;
    top: 10px;
    left: 10px;
    padding: 10px 14px;
    transform: translateY(-150%);
    background: var(--ink);
    color: var(--paper);
}
.skip-link:focus { transform: translateY(0); }
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    clip-path: inset(50%);
}

.page-shell {
    width: min(100%, var(--page-width));
    min-height: 100vh;
    margin: 0 auto;
    padding: 0 var(--gutter);
}
.masthead {
    display: flex;
    min-height: 64px;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line-strong);
}
.wordmark { display: inline-flex; align-items: center; gap: 13px; color: var(--ink); text-decoration: none; }
.wordmark-g { font-size: 27px; font-weight: 760; letter-spacing: -.1em; line-height: 1; }
.wordmark-g span { color: var(--blue); }
.wordmark-divider { width: 1px; height: 25px; background: var(--line-strong); }
.wordmark-owner { font-size: 9px; font-weight: 700; letter-spacing: .12em; }
.wordmark-owner small { display: block; margin-top: 3px; color: var(--muted); font-size: 7px; font-weight: 500; letter-spacing: .16em; }
.masthead-meta { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 11px; }
.masthead-coordinate { color: var(--ink-soft); font-size: 9px; font-weight: 650; letter-spacing: .13em; }

.intro {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
    align-items: end;
    gap: clamp(24px, 3vw, 42px);
    padding: 21px 0 18px;
    border-bottom: 1px solid var(--line-strong);
}
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 10px; color: var(--muted); font-size: 9px; font-weight: 650; letter-spacing: .17em; }
.eyebrow span { width: 8px; height: 8px; background: var(--blue); }
.intro h1 { margin: 0; font-size: clamp(42px, 4.3vw, 62px); font-weight: 660; letter-spacing: -.075em; line-height: 1.05; }
.intro h1 span { margin-left: .1em; color: var(--blue); font-size: .64em; font-weight: 550; letter-spacing: -.04em; }
.intro-note { margin: 8px 0 0; color: var(--muted); font-size: 12px; letter-spacing: .025em; }
.intro-tools { display: grid; gap: 10px; }
.search-field {
    display: flex;
    min-height: 44px;
    align-items: center;
    gap: 12px;
    padding: 0 13px;
    border: 1px solid var(--line-strong);
    background: var(--paper);
    transition: border-color .24s var(--motion), box-shadow .24s var(--motion);
}
.search-field:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px #2455d61a; }
.search-icon { width: 17px; height: 17px; flex: 0 0 auto; fill: none; stroke: #586273; stroke-width: 1.6; stroke-linecap: round; }
.search-field input { width: 100%; min-width: 0; height: 42px; padding: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 13px; }
.search-field input::placeholder { color: #606a79; }
.search-field input::-webkit-search-cancel-button { display: none; }
.search-shortcut { display: flex; flex: 0 0 auto; align-items: center; gap: 7px; color: var(--muted); font-size: 10px; }
kbd { display: inline-grid; min-width: 20px; height: 20px; place-items: center; border: 1px solid var(--line-strong); background: var(--canvas); color: var(--ink-soft); font-family: var(--sans); font-size: 10px; }
.search-clear { display: grid; width: 26px; height: 26px; flex: 0 0 auto; place-items: center; padding: 0; border: 0; background: transparent; color: #586273; cursor: pointer; }
.search-clear svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.search-clear:hover { color: var(--blue); }
.intro-summary { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 10px; }
.intro-summary strong { color: var(--ink); font-size: 13px; font-weight: 650; }
.summary-divider { width: 1px; height: 12px; background: var(--line-strong); }
.search-summary { display: flex; min-height: 14px; align-items: center; gap: 5px; margin: 0; color: var(--blue); font-size: 11px; }
.search-summary strong { font-size: 12px; }

.directory-layout {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 66px);
    padding: 22px 0 24px;
}
.directory-sidebar {
    position: sticky;
    top: 16px;
    align-self: start;
    max-height: calc(100vh - 32px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--line-strong) transparent;
}
.sidebar-heading { display: flex; align-items: baseline; justify-content: space-between; padding: 0 9px 13px 11px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line-strong); color: var(--ink); font-size: 12px; font-weight: 650; }
.sidebar-heading > span:first-child { padding-top: 13px; }
.sidebar-total { color: var(--muted); font-size: 8px; font-weight: 550; letter-spacing: .1em; }
.sidebar-total b { margin-right: 3px; color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: 0; }
.index-nav { display: grid; gap: 3px; padding-top: 10px; }
.index-link {
    position: relative;
    display: grid;
    min-height: 42px;
    grid-template-columns: 25px minmax(0, 1fr) 25px;
    align-items: center;
    gap: 8px;
    padding: 0 10px;
    border-left: 2px solid transparent;
    color: #525a68;
    text-decoration: none;
    transition: color .2s var(--motion), background-color .2s var(--motion), border-color .2s var(--motion);
}
.index-link:hover { color: var(--ink); background: #ffffffa8; }
.index-link[aria-current="location"] { border-left-color: var(--blue); background: var(--paper); color: var(--ink); }
.index-link-number { color: #606a79; font-size: 9px; font-variant-numeric: tabular-nums; }
.index-link[aria-current="location"] .index-link-number { color: var(--blue); }
.index-link-title { overflow: hidden; font-size: 11px; font-weight: 560; text-overflow: ellipsis; white-space: nowrap; }
.index-link-count { color: #687181; font-size: 9px; font-variant-numeric: tabular-nums; text-align: right; }
.sidebar-top { display: flex; align-items: center; justify-content: space-between; margin: 15px 9px 0 11px; padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; text-decoration: none; }
.sidebar-top span { color: var(--blue); font-size: 14px; }

.directory-main { min-width: 0; }
.category-section { padding: 0 0 25px; margin: 0 0 25px; border-bottom: 1px solid var(--line-strong); scroll-margin-top: 25px; }
#directory-content > .category-section:last-child { margin-bottom: 0; }
.category-heading { display: flex; min-height: 60px; align-items: center; gap: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.category-number { color: var(--blue); font-size: 35px; font-weight: 350; letter-spacing: -.08em; line-height: .9; font-variant-numeric: tabular-nums; }
.category-title-wrap { display: grid; gap: 5px; }
.category-kicker { color: #677184; font-size: 8px; font-weight: 600; letter-spacing: .16em; }
.category-heading h2 { margin: 0; font-size: 22px; font-weight: 620; letter-spacing: -.045em; line-height: 1.18; }
.category-total { display: flex; align-items: baseline; gap: 5px; margin-left: auto; color: var(--muted); font-size: 10px; white-space: nowrap; }
.category-total strong { color: var(--ink-soft); font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.site-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr));
    gap: 11px;
    padding-top: 15px;
}
.site-entry {
    display: grid;
    min-width: 0;
    min-height: 78px;
    grid-template-columns: 34px minmax(0, 1fr) 16px;
    align-items: center;
    gap: 12px;
    padding: 12px 13px;
    border: 1px solid var(--line);
    background: #ffffffa6;
    color: inherit;
    text-decoration: none;
    transition: transform .2s var(--motion), border-color .2s var(--motion), background-color .2s var(--motion), box-shadow .2s var(--motion);
}
.site-entry:hover { transform: translateY(-2px); border-color: #b8c4dc; background: var(--paper); box-shadow: 0 8px 20px #17213b0c; }
.site-entry:focus-visible, .index-link:focus-visible, .wordmark:focus-visible, .sidebar-top:focus-visible, .footer-wordmark:focus-visible, .back-to-top:focus-visible, .reset-search:focus-visible, .search-clear:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 3px;
}
.site-icon { display: grid; width: 34px; height: 34px; place-items: center; overflow: hidden; border: 1px solid #e7eaf0; background: var(--paper); color: var(--blue); font-size: 14px; font-weight: 650; }
.site-icon img { display: block; width: 22px; height: 22px; object-fit: contain; }
.site-icon.icon-fallback { border-color: #d7ddea; background: var(--blue-soft); }
.site-entry-copy { display: grid; min-width: 0; gap: 5px; }
.site-entry-name { overflow: hidden; color: #202531; font-size: 14px; font-weight: 630; line-height: 1.35; text-overflow: ellipsis; white-space: nowrap; }
.site-entry-description { min-width: 0; overflow: hidden; color: #687181; font-size: 11px; line-height: 1.45; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.site-entry-arrow { color: #687181; font-size: 14px; text-align: center; transition: color .2s var(--motion), transform .2s var(--motion); }
.site-entry:hover .site-entry-arrow { transform: translate(1px, -1px); color: var(--blue); }

.empty-state { display: grid; justify-items: start; padding: 64px 0 90px; }
.empty-code { color: var(--blue); font-size: 16px; font-weight: 650; font-variant-numeric: tabular-nums; }
.empty-state h2 { margin: 12px 0 7px; font-size: 24px; font-weight: 600; letter-spacing: -.04em; }
.empty-state p { margin: 0; color: var(--muted); font-size: 12px; }
.reset-search { margin-top: 20px; padding: 9px 14px; border: 1px solid var(--line-strong); background: var(--paper); color: var(--ink-soft); font-size: 11px; cursor: pointer; transition: border-color .2s var(--motion), color .2s var(--motion); }
.reset-search:hover { border-color: var(--blue); color: var(--blue); }

.page-footer { display: flex; flex-wrap: wrap; min-height: 68px; align-items: center; gap: 18px; padding-block: 14px; border-top: 1px solid var(--line-strong); color: var(--muted); }
.footer-icp { font-size: 12px; line-height: 1.6; letter-spacing: 0; }
.footer-icp:hover { color: var(--blue); }
.footer-wordmark { color: var(--ink); font-size: 21px; font-weight: 700; letter-spacing: -.1em; text-decoration: none; }
.footer-wordmark span { color: var(--blue); }
.footer-note { margin-left: auto; font-size: 8px; font-weight: 550; letter-spacing: .12em; }
.footer-note i { margin: 0 7px; color: var(--blue); font-style: normal; }
.back-to-top { display: flex; align-items: center; gap: 8px; color: var(--ink-soft); font-size: 10px; text-decoration: none; }
.back-to-top span { color: var(--blue); font-size: 14px; }
.noscript-message { position: fixed; z-index: 30; inset: 0 0 auto; margin: 0; padding: 12px; background: var(--ink); color: var(--paper); text-align: center; }

@media (max-width: 1080px) {
    :root { --gutter: 28px; }
    .intro { grid-template-columns: minmax(0, 1fr) minmax(270px, 360px); gap: 26px; }
    .directory-layout { grid-template-columns: 184px minmax(0, 1fr); gap: 24px; }
}

@media (min-width: 821px) {
    .intro {
        grid-template-columns: max-content minmax(300px, 380px);
        align-items: center;
        justify-content: center;
        gap: clamp(36px, 6vw, 100px);
        padding: 14px 0;
    }
    .eyebrow, .intro-note { display: none; }
    .intro h1 { font-size: clamp(42px, 4vw, 58px); }
}

@media (max-width: 820px) {
    :root { --gutter: 24px; }
    html { scroll-padding-top: 72px; }
    .intro { grid-template-columns: minmax(0, 1fr) minmax(270px, 340px); gap: 24px; padding-top: 42px; }
    .intro h1 { font-size: clamp(43px, 7vw, 60px); }
    .directory-layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 0; }
    .directory-sidebar {
        top: 0;
        z-index: 10;
        max-height: none;
        margin: 0 calc(-1 * var(--gutter));
        padding: 0 var(--gutter);
        overflow: visible;
        border-bottom: 1px solid var(--line-strong);
        background: #f5f6f8f2;
        -webkit-backdrop-filter: blur(12px);
        backdrop-filter: blur(12px);
    }
    .sidebar-heading, .sidebar-top { display: none; }
    .index-nav { display: flex; gap: 4px; padding: 0; overflow-x: auto; scrollbar-width: none; }
    .index-nav::-webkit-scrollbar { display: none; }
    .index-link {
        min-height: 48px;
        flex: 0 0 auto;
        grid-template-columns: auto auto;
        gap: 7px;
        padding: 0 10px;
        border: 0;
        border-bottom: 2px solid transparent;
        background: transparent;
    }
    .index-link:hover, .index-link[aria-current="location"] { background: transparent; }
    .index-link[aria-current="location"] { border-bottom-color: var(--blue); }
    .index-link-count { display: none; }
    .index-link-title { font-size: 11px; }
    .directory-main { padding-top: 18px; }
    .category-section { scroll-margin-top: 74px; }
    .site-list { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 9px; }
}

@media (max-width: 640px) {
    :root { --gutter: 18px; }
    .masthead { min-height: 64px; }
    .masthead-meta { gap: 0; font-size: 10px; }
    .masthead-coordinate { display: none; }
    .wordmark { gap: 10px; }
    .wordmark-g { font-size: 24px; }
    .wordmark-owner { font-size: 8px; }
    .wordmark-owner small { font-size: 6px; }
    .intro { grid-template-columns: minmax(0, 1fr); gap: 25px; padding: 34px 0 25px; }
    .eyebrow { margin-bottom: 13px; font-size: 8px; }
    .intro h1 { font-size: clamp(42px, 11vw, 58px); }
    .intro-note { margin-top: 11px; font-size: 11px; }
    .intro-tools { gap: 11px; }
    .search-field { min-height: 47px; gap: 9px; }
    .search-field input { height: 43px; font-size: 12px; }
    .search-shortcut { gap: 0; }
    .search-shortcut span { display: none; }
    .intro-summary { font-size: 9px; }
    .directory-main { padding-top: 22px; }
    .category-section { padding-bottom: 24px; margin-bottom: 23px; }
    .category-heading { min-height: 62px; gap: 11px; padding-bottom: 11px; }
    .category-number { font-size: 33px; }
    .category-kicker { font-size: 7px; }
    .category-heading h2 { font-size: 20px; }
    .category-total { gap: 4px; font-size: 9px; }
    .category-total strong { font-size: 12px; }
    .site-list { padding-top: 13px; }
    .site-entry { min-height: 72px; grid-template-columns: 31px minmax(0, 1fr) 14px; gap: 10px; padding: 10px 11px; }
    .site-icon { width: 31px; height: 31px; }
    .site-icon img { width: 20px; height: 20px; }
    .site-entry-name { font-size: 13px; }
    .site-entry-description { font-size: 10px; }
    .page-footer { min-height: 60px; gap: 12px; }
    .footer-note { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}