:root {
    color-scheme: light;
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #667085;
    --line: #e4e7ec;
    --brand: #155eef;
    --brand-soft: #eff4ff;
    --warning: #b54708;
    --warning-soft: #fffaeb;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.8;
}

a {
    color: var(--brand);
}

.site-header {
    background: linear-gradient(135deg, #0b4bd4 0%, #2563eb 55%, #5b8def 100%);
    color: #fff;
}

.site-header__inner,
.document {
    width: min(920px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header__inner {
    padding: 48px 0 42px;
}

.eyebrow {
    margin: 0 0 10px;
    color: #dbe8ff;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

h1 {
    margin: 0;
    font-size: clamp(30px, 5vw, 44px);
    line-height: 1.3;
}

.updated-at {
    margin: 12px 0 0;
    color: #e8efff;
    font-size: 14px;
}

.document {
    margin-top: 28px;
    margin-bottom: 56px;
    padding: 44px 52px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--card);
    box-shadow: 0 14px 40px rgba(16, 24, 40, 0.08);
}

.summary {
    margin: 0 0 32px;
    padding: 18px 20px;
    border-left: 4px solid var(--brand);
    border-radius: 0 10px 10px 0;
    background: var(--brand-soft);
}

h2 {
    margin: 38px 0 12px;
    font-size: 22px;
    line-height: 1.45;
}

h3 {
    margin: 24px 0 8px;
    font-size: 17px;
}

p,
ul,
ol {
    margin-top: 8px;
    margin-bottom: 14px;
}

ul,
ol {
    padding-left: 1.5em;
}

li + li {
    margin-top: 8px;
}

.notice {
    margin: 22px 0;
    padding: 16px 18px;
    border: 1px solid #fedf89;
    border-radius: 10px;
    background: var(--warning-soft);
    color: var(--warning);
}

.document-nav {
    display: flex;
    gap: 16px;
    margin-top: 38px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
}

.document-nav a {
    font-weight: 600;
    text-decoration: none;
}

.footer {
    margin-top: 42px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }

    .site-header__inner {
        padding: 34px 0 30px;
    }

    .document {
        width: calc(100% - 20px);
        margin-top: 10px;
        padding: 28px 22px;
        border-radius: 14px;
    }

    h2 {
        margin-top: 30px;
        font-size: 20px;
    }

    .document-nav {
        flex-direction: column;
        gap: 8px;
    }
}