:root { --bg: #F3F5F4; --card: #FFFFFF; --text: #14201B; --muted: #4F5D57; --line: #DCE3DF; --link: #0F7A55; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #0E1512; --card: #17211D; --text: #EAF1ED; --muted: #A9B8B1; --line: #2A3732; --link: #5FD3A3; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; -webkit-text-size-adjust: 100%; }
main { max-width: 720px; margin: 0 auto; padding: max(24px, env(safe-area-inset-top)) 16px 48px; overflow-wrap: anywhere; }
h1 { font-size: 30px; line-height: 1.15; letter-spacing: -0.02em; margin: 8px 0 4px; }
h2 { font-size: 20px; line-height: 1.25; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { color: var(--muted); }
ul { padding-left: 20px; }
a { color: var(--link); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px; margin: 16px 0; }
.card p { margin: 0; color: var(--text); }
.meta { font-size: 14px; }
nav { display: flex; gap: 16px; font-size: 15px; }