:root {
  --ink: #0f1b2d;
  --ink-2: #1e2b40;
  --text: #1f2937;
  --muted: #5b6577;
  --line: #e3e7ee;
  --paper: #f7f8fa;
  --card: #ffffff;
  --green: #0e9f6e;
  --green-bg: #e7f6ef;
  --amber: #b45309;
  --amber-bg: #fdf3e4;
  --red: #b42318;
  --focus: #2563eb;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(15, 27, 45, .06), 0 8px 24px rgba(15, 27, 45, .06);
  --font: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e8edf5; --ink-2: #cdd6e4; --text: #dfe5ee; --muted: #98a3b5; --line: #263246;
    --paper: #0b1320; --card: #111b2b; --green: #34d399; --green-bg: #0f2a22; --amber: #fbbf24; --amber-bg: #2b2111; --red: #f87171;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #e8edf5; --ink-2: #cdd6e4; --text: #dfe5ee; --muted: #98a3b5; --line: #263246;
  --paper: #0b1320; --card: #111b2b; --green: #34d399; --green-bg: #0f2a22; --amber: #fbbf24; --amber-bg: #2b2111; --red: #f87171;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--paper); line-height: 1.55; font-size: 16px; }
a { color: inherit; }
img, svg { max-width: 100%; }
h1, h2, h3 { color: var(--ink); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 750; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.1rem; font-weight: 650; }
p { margin: 0 0 1em; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 750; color: var(--ink); text-decoration: none; font-size: 1.1rem; letter-spacing: -0.01em; }
.brand svg { width: 28px; height: 28px; }
.nav-links { display: flex; gap: 18px; margin-left: auto; align-items: center; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: .95rem; }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav-links a.hide-sm { display: none; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font: 600 .95rem var(--font); cursor: pointer; text-decoration: none; transition: transform .05s, background .15s, border-color .15s; white-space: nowrap; }
.btn:hover { border-color: color-mix(in srgb, var(--ink) 30%, var(--line)); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.primary:hover { background: var(--ink-2); }
.btn.green { background: var(--green); border-color: var(--green); color: #fff; }
.btn.lg { padding: 14px 22px; font-size: 1.05rem; border-radius: 12px; }
.btn.sm { padding: 6px 10px; font-size: .85rem; border-radius: 8px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn .lock { font-size: .8em; opacity: .7; }

.pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; font-size: .8rem; font-weight: 600; background: var(--green-bg); color: var(--green); }
.pill.amber { background: var(--amber-bg); color: var(--amber); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }

/* footer */
footer.site { border-top: 1px solid var(--line); padding: 36px 0 48px; margin-top: 64px; color: var(--muted); font-size: .9rem; }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; justify-content: space-between; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 16px; }
footer.site a { color: var(--muted); }

/* prose (guides & legal) */
.prose { max-width: 740px; margin: 0 auto; padding: 48px 20px; }
.prose h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.prose h2 { font-size: 1.45rem; margin-top: 1.8em; }
.prose h3 { margin-top: 1.4em; }
.prose table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .95rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose code { font-family: var(--mono); font-size: .9em; background: color-mix(in srgb, var(--line) 50%, transparent); padding: 1px 5px; border-radius: 4px; }
.prose li { margin: .3em 0; }
.prose .cta { margin: 2em 0; padding: 20px; border-radius: var(--radius); background: var(--green-bg); }