:root {
    --ink: #16251f;
    --muted: #5c6c65;
    --line: #dce5e0;
    --soft: #f5f8f6;
    --accent: #176b52;
    --accent-dark: #0f4e3b;
    --white: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;
    color: var(--ink);
    background: var(--white);
    line-height: 1.65;
}

header {
    border-bottom: 1px solid var(--line);
    background: var(--white);
}

.header-inner,
main,
.footer-inner {
    width: min(920px, calc(100% - 40px));
    margin: 0 auto;
}

.header-inner {
    padding: 22px 0;
    display: flex;
    gap: 24px;
    justify-content: space-between;
    align-items: center;
}

.brand {
    color: var(--accent-dark);
    font-size: 1.35rem;
    font-weight: 750;
    text-decoration: none;
}

nav {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

nav a,
footer a,
main a {
    color: var(--accent);
}

nav a {
    text-decoration: none;
    font-size: 0.95rem;
}

nav a:hover,
.brand:hover {
    text-decoration: underline;
}

main {
    padding: 58px 0 70px;
}

.hero {
    padding: 40px 0 26px;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.15;
    margin: 0 0 18px;
}

h2 {
    margin-top: 42px;
    line-height: 1.25;
    color: var(--accent-dark);
}

h3 {
    margin-top: 28px;
}

p,
li {
    font-size: 1rem;
}

.lead {
    font-size: 1.15rem;
    color: var(--muted);
    max-width: 760px;
}

.meta {
    color: var(--muted);
    font-size: 0.93rem;
}

.cards {
    display: grid;
    grid-template-columns:
        repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin: 32px 0;
}

.card {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 22px;
    background: var(--soft);
}

.card h2 {
    margin-top: 0;
    font-size: 1.15rem;
}

.notice {
    border-left: 4px solid var(--accent);
    padding: 14px 18px;
    background: var(--soft);
    margin: 26px 0;
}

code {
    background: var(--soft);
    padding: 2px 5px;
    border-radius: 4px;
}

footer {
    border-top: 1px solid var(--line);
    color: var(--muted);
}

.footer-inner {
    padding: 28px 0 42px;
    font-size: 0.92rem;
}

@media (max-width: 650px) {
    .header-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    main {
        padding-top: 35px;
    }
}