:root { --bg: #ffffff; --text: #1a1a1a; --muted: #555; --accent: #005fb8; --card: #f3f3f3; --line: #e0e0e0; }
@media (prefers-color-scheme: dark) { :root { --bg: #1f1f1f; --text: #f2f2f2; --muted: #c5c5c5; --accent: #60cdff; --card: #2b2b2b; --line: #3d3d3d; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
p, li { max-width: 68ch; }
.tagline { color: var(--muted); margin: 0 0 24px; }
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; margin: 16px 0; }
.button { display: inline-block; background: var(--accent); color: var(--bg); text-decoration: none; font-weight: 600; padding: 10px 18px; border-radius: 6px; min-height: 44px; }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin: 24px 0; }
footer { color: var(--muted); font-size: 0.9rem; border-top: 1px solid var(--line); margin-top: 40px; padding-top: 16px; }
.brand { display: flex; align-items: center; gap: 16px; margin: 0 0 4px; }
.brand h1 { margin: 0; }
.highlight { border-color: var(--accent); border-width: 2px; }
.highlight h2 { margin-top: 0; }
.note { color: var(--muted); font-size: 0.95rem; margin-top: 0; }
figure { margin: 16px 0 24px; }
figure img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 8px; }
figcaption { color: var(--muted); font-size: 0.95rem; margin-top: 8px; }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.pair figure { margin: 0 0 24px; }
@media (max-width: 600px) { .pair { grid-template-columns: 1fr; } }
.highlight .button { margin-top: 4px; }