:root {
    color-scheme: dark;
    --bg: #0a0e18;
    --surface: #131a2b;
    --hairline: #2a3550;
    --ink: #e6eaf5;
    --muted: #aab3c8;
    --accent: #4ecdc4;
}

* {
    box-sizing: border-box;
}

html {
    background: var(--bg);
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--ink);
    background: radial-gradient(circle at 15% 5%, rgba(78, 205, 196, 0.12), transparent 34rem), var(--bg);
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    line-height: 1.58;
}

header,
main,
footer {
    width: min(100% - 32px, 760px);
    margin-inline: auto;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--hairline);
}

.brand {
    color: var(--ink);
    font-size: 1.05rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-decoration: none;
}

nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px 16px;
    font-size: 0.82rem;
}

a {
    color: var(--accent);
    text-underline-offset: 3px;
}

main {
    padding: 48px 0 56px;
}

h1,
h2 {
    line-height: 1.2;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 7vw, 3.2rem);
}

h2 {
    margin: 2rem 0 0.55rem;
    font-size: 1.15rem;
}

p,
li {
    color: var(--muted);
}

p {
    margin: 0.7rem 0;
}

ul {
    margin: 0.6rem 0;
    padding-left: 1.25rem;
}

li + li {
    margin-top: 0.45rem;
}

.effective {
    margin-top: 0.65rem;
    color: var(--accent);
    font-size: 0.85rem;
}

.summary {
    margin: 1.5rem 0;
    padding: 16px 18px;
    border: 1px solid var(--hairline);
    border-radius: 12px;
    background: rgba(19, 26, 43, 0.76);
}

strong {
    color: var(--ink);
}

footer {
    padding: 22px 0 32px;
    border-top: 1px solid var(--hairline);
    color: var(--muted);
    font-size: 0.8rem;
}

@media (max-width: 560px) {
    header {
        align-items: flex-start;
        flex-direction: column;
    }

    nav {
        justify-content: flex-start;
    }

    main {
        padding-top: 34px;
    }
}