:root {
    --bg: #050b1b;
    --bg-mid: #0a1228;
    --text: #e8eef8;
    --muted: #a7b1c3;
    --line: rgba(255, 255, 255, 0.12);
    --accent: #00b4d8;
    --teal: #00d1b2;
    --link: #7ec8ff;
    --panel: rgba(255, 255, 255, 0.035);
    --maxw: 780px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--text);
    background:
        radial-gradient(800px 420px at 88% -8%, rgba(0, 177, 216, 0.16), transparent 55%),
        linear-gradient(180deg, var(--bg-mid), var(--bg) 45%);
    font-family: "Source Sans 3", system-ui, sans-serif;
    line-height: 1.65;
    min-height: 100vh;
}

a { color: var(--link); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

header {
    border-bottom: 1px solid var(--line);
    background: rgba(5, 11, 27, 0.82);
}

.header-inner, main, footer {
    width: min(100% - 40px, var(--maxw));
    margin-inline: auto;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    padding: 15px 0;
}

.brand { color: var(--text); font-family: "Space Grotesk", sans-serif; font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px; }
nav a { color: var(--muted); font-size: 0.9rem; text-decoration: none; }

main { padding: 60px 0 30px; }
.eyebrow { color: var(--teal); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
h1, h2, h3 { font-family: "Space Grotesk", sans-serif; line-height: 1.15; }
h1 { margin: 10px 0 16px; font-size: clamp(2.4rem, 7vw, 4.5rem); letter-spacing: -0.04em; }
h2 { margin: 48px 0 12px; padding-top: 8px; font-size: 1.55rem; border-top: 1px solid var(--line); }
h3 { margin: 0 0 6px; font-size: 1.05rem; }
.lead { max-width: 42rem; color: var(--muted); font-size: 1.1rem; }

.cards { display: grid; gap: 14px; margin-top: 22px; }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.card { padding: 18px 20px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.card p, .card li { color: var(--muted); font-size: 0.94rem; }
.card p { margin: 0; }
.card ul { margin: 10px 0 0; padding-left: 20px; }
.card li + li { margin-top: 5px; }

.note { margin: 22px 0; padding: 16px 18px; border-left: 3px solid var(--accent); background: rgba(0, 180, 216, 0.07); color: var(--muted); }
.meta { color: var(--muted); font-size: 0.9rem; }
code { overflow-wrap: anywhere; color: var(--text); }
ol.steps { padding-left: 24px; }
ol.steps > li { margin: 22px 0; padding-left: 8px; }
ol.steps strong { display: block; color: var(--text); font-family: "Space Grotesk", sans-serif; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 0.94rem; }
th, td { padding: 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--panel); }
td { color: var(--muted); }

footer { margin-top: 40px; padding: 20px 0 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.86rem; }
footer a { margin-right: 14px; }

@media (max-width: 620px) {
    .header-inner { align-items: flex-start; flex-direction: column; }
    nav { justify-content: flex-start; }
    .cards.two { grid-template-columns: 1fr; }
    main { padding-top: 42px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }