:root { --bg: #f7f5f0; --ink: #1d1f24; --muted: #5d6270; --line: #d9d5cc; --accent: #2f5d8a; --code: #ffffff; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161b; --ink: #e8e6e1; --muted: #a0a4ae; --line: #2c3038; --accent: #8fb7e0; --code: #1d2027; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.75 "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 1.1rem; margin: 28px 0 6px; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: .9rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
code { font-size: .9em; }
.code { background: var(--code); border: 1px solid var(--line); border-radius: 8px; padding: 14px; font-family: ui-monospace, Consolas, monospace; word-break: break-all; margin: 16px 0; }
button { font: inherit; padding: 6px 16px; border-radius: 6px; border: 1px solid var(--line); background: var(--code); color: var(--ink); cursor: pointer; }
button:disabled { opacity: .5; cursor: default; }