:root {
    --paper: #e8eee6;
    --paper-deep: #dce5db;
    --paper-raise: #f3f6ef;
    --ink: #162e29;
    --ink-soft: #3d544c;
    --muted: #556b60;
    --jade: #3f6f5f;
    --jade-deep: #2c5449;
    --azurite: #4a628c;
    --cinnabar: #a83a2a;
    --gold: #b08a4f;
    --line: #c9d6cc;
    --line-soft: #dbe4db;
    --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", STSong, serif;
    --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.9;
    letter-spacing: 0.01em;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--jade);
    text-underline-offset: 0.24em;
    text-decoration-thickness: 1px;
    text-decoration-color: color-mix(in srgb, var(--jade) 45%, transparent);
}

a:hover {
    color: var(--jade-deep);
    text-decoration-color: currentColor;
}

.wrap {
    width: min(880px, calc(100% - 44px));
    margin: 0 auto;
}

header {
    border-bottom: 1px solid var(--line-soft);
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(12px);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 58px;
    gap: 18px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
    color: var(--ink);
    font-family: var(--serif);
    font-size: 16.5px;
    font-weight: 600;
    letter-spacing: 0.2em;
}

.brand svg {
    width: 30px;
    height: 30px;
    flex: 0 0 auto;
}

.nav a.small {
    font-size: 13px;
    letter-spacing: 0.08em;
    text-decoration: none;
    color: var(--muted);
    margin-left: 20px;
    transition: color 0.2s ease;
}

.nav a.small:hover {
    color: var(--ink);
}

main {
    padding: 56px 0 90px;
}

.eyebrow {
    display: none;
}

h1 {
    font-family: var(--serif);
    font-size: clamp(32px, 5vw, 50px);
    line-height: 1.18;
    margin: 0 0 0.4em;
    font-weight: 600;
    letter-spacing: 0.02em;
}

h2 {
    font-family: var(--serif);
    font-size: 21px;
    line-height: 1.4;
    margin: 2.3em 0 0.6em;
    padding-top: 0.9em;
    border-top: 1px solid var(--line);
    letter-spacing: 0.03em;
}

h3 {
    font-family: var(--serif);
    font-size: 16.5px;
    margin: 1.5em 0 0.4em;
    letter-spacing: 0.03em;
}

p,
li {
    font-size: 15px;
    line-height: 1.92;
    color: var(--ink-soft);
}

p strong,
li strong {
    color: var(--ink);
    font-weight: 600;
}

ul,
ol {
    padding-left: 1.35em;
}

.notebackground {
    background: color-mix(in srgb, var(--paper-raise) 70%, transparent);
    border-left: 2px solid var(--jade);
    padding: 18px 22px;
    margin: 26px 0;
}

code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.88em;
    background: color-mix(in srgb, var(--jade) 8%, transparent);
    padding: 0.12em 0.35em;
    word-break: break-all;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
}

th,
td {
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--line);
    padding: 11px 10px 11px 0;
    color: var(--ink-soft);
}

th {
    font-weight: 500;
    color: var(--muted);
    font-size: 12.5px;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.meta {
    color: var(--muted);
    font-size: 12.5px;
    letter-spacing: 0.05em;
}

footer {
    border-top: 1px solid var(--line);
    padding: 26px 0 38px;
    color: var(--muted);
    font-size: 12.5px;
    letter-spacing: 0.05em;
}

footer .wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

footer .brandline {
    display: inline-flex;
    align-items: center;
    gap: 9px;
}

footer .brandline svg {
    width: 20px;
    height: 20px;
}

footer a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 18px;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--ink);
}

@media (max-width: 620px) {
    main {
        padding-top: 36px;
    }

    h1 {
        font-size: 32px;
    }

    th {
        white-space: normal;
    }

    footer .wrap {
        flex-direction: column;
        align-items: flex-start;
    }

    footer a {
        margin-left: 0;
        margin-right: 16px;
    }
}

@media print {
    header,
    footer {
        display: none;
    }

    body {
        background: #fff;
        color: #111;
    }
}