:root { --bg: #0f1115; --fg: #e8eaed; --accent: #6ab0ff; --muted: #9aa0a6; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--fg); line-height: 1.5; }
header, main, footer { max-width: 920px; margin: 0 auto; padding: 16px; }
header { border-bottom: 1px solid #262b33; }
h1 { font-size: 1.4rem; margin: 0 0 4px; }
nav, footer { color: var(--muted); font-size: 0.9rem; }
code { background: #1b2027; padding: 1px 5px; border-radius: 4px; color: var(--accent); }
ul { padding-left: 1.2rem; }
form label { display: block; margin: 8px 0; }
input, button { font: inherit; padding: 6px 8px; border-radius: 6px; border: 1px solid #333; background: #1b2027; color: var(--fg); }
button { background: var(--accent); color: #0b0d10; border: none; cursor: pointer; }
#cmt, #preview, #memo-preview { border: 1px solid #262b33; border-radius: 6px; padding: 10px; margin: 8px 0; }