:root { --ink: #14202b; --quiet: #5b6b78; --accent: #007ab4; --bg: #ffffff; --panel: #f2f6f9; --rule: #dbe3ea; }
@media (prefers-color-scheme: dark) { :root { --ink: #e8eef3; --quiet: #9fb0bd; --accent: #4fb3e6; --bg: #0f1a22; --panel: #182631; --rule: #26384a; } }
* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--ink); background: var(--bg); }
main { max-width: 760px; margin: 0 auto; padding: 32px 20px 64px; }
header.site { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header.site .mark { width: 44px; height: 44px; border-radius: 10px; background: linear-gradient(180deg, #0a2236, #006080); flex: none; }
header.site h1 { font-size: 1.35rem; margin: 0; }
header.site p { margin: 2px 0 0; color: var(--quiet); font-size: 0.95rem; }
nav { margin: 18px 0 28px; display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.95rem; }
nav a { color: var(--accent); text-decoration: none; }
h2 { font-size: 1.15rem; margin: 32px 0 10px; }
h3 { font-size: 1rem; margin: 22px 0 6px; }
p, li { max-width: 68ch; }
.panel { background: var(--panel); border: 1px solid var(--rule); border-radius: 12px; padding: 14px 18px; margin: 16px 0; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; background: var(--panel); padding: 1px 5px; border-radius: 4px; }
.formula { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.95em; background: var(--panel); border: 1px solid var(--rule); border-radius: 8px; padding: 10px 14px; margin: 8px 0 14px; overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 10px 0 18px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { color: var(--quiet); font-weight: 600; }
footer { margin-top: 48px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--quiet); font-size: 0.9rem; }
a { color: var(--accent); }