:root {
    color-scheme: light;
    --ink: #17211f;
    --muted: #5f6f6a;
    --line: #dfe8e4;
    --paper: #fbfdfb;
    --panel: #ffffff;
    --forest: #1d5b4a;
    --water: #2c7c94;
    --sun: #f0b35a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.65;
    color: var(--ink);
    background:
        linear-gradient(180deg, rgba(231, 246, 240, 0.92), rgba(251, 253, 251, 1) 360px),
        var(--paper);
}

a {
    color: var(--forest);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.shell {
    width: min(980px, calc(100% - 32px));
    margin: 0 auto;
}

header {
    padding: 34px 0 26px;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--ink);
    text-decoration: none;
}

.mark {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
    padding: 8px;
    background: linear-gradient(135deg, var(--forest), var(--water));
    box-shadow: 0 10px 24px rgba(29, 91, 74, 0.22);
}

.mark span {
    display: block;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.86);
}

.brand-title {
    font-weight: 750;
    letter-spacing: 0;
}

.links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    justify-content: flex-end;
    font-size: 14px;
}

.hero {
    padding: 28px 0 34px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--forest);
    font-size: 13px;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

h1 {
    max-width: 820px;
    margin: 0;
    font-size: clamp(36px, 7vw, 74px);
    line-height: 0.98;
    letter-spacing: 0;
}

.summary {
    max-width: 720px;
    margin: 20px 0 0;
    color: var(--muted);
    font-size: 18px;
}

.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.pill {
    padding: 7px 11px;
    border: 1px solid rgba(29, 91, 74, 0.16);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--muted);
    font-size: 13px;
}

main {
    padding-bottom: 64px;
}

.grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    align-items: start;
}

.toc {
    position: sticky;
    top: 18px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.78);
}

.toc-title {
    margin: 0 0 10px;
    font-size: 13px;
    color: var(--muted);
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.toc a {
    display: block;
    padding: 6px 0;
    color: var(--ink);
    font-size: 14px;
    text-decoration: none;
}

.card {
    padding: 30px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: 0 18px 55px rgba(20, 45, 38, 0.07);
}

section + section {
    margin-top: 30px;
}

h2 {
    margin: 0 0 12px;
    font-size: 24px;
    line-height: 1.2;
    letter-spacing: 0;
}

h3 {
    margin: 24px 0 8px;
    font-size: 18px;
    letter-spacing: 0;
}

p {
    margin: 0 0 14px;
}

ul {
    margin: 0 0 16px;
    padding-left: 22px;
}

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

.notice {
    border-left: 4px solid var(--sun);
    padding: 14px 16px;
    background: #fff8eb;
    color: #5b4321;
    border-radius: 6px;
}

.support-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.action {
    display: block;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f8fbf9;
    color: var(--ink);
    text-decoration: none;
}

.action strong {
    display: block;
    margin-bottom: 4px;
}

.action span {
    color: var(--muted);
    font-size: 14px;
}

footer {
    border-top: 1px solid var(--line);
    padding: 24px 0 38px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 760px) {
    header {
        padding-top: 24px;
    }

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

    .links {
        justify-content: flex-start;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .toc {
        position: static;
    }

    .card {
        padding: 22px;
    }

    .support-actions {
        grid-template-columns: 1fr;
    }
}