:root {
  --bg: #F7F2E8; --surface: #FFFCF6; --text: #0E1230; --muted: #4E5270; --primary: #2B3FD6;
  --line: #E6DCC8; --yellow: #FFD23F; --note-bg: #FFF4C2;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E1230; --surface: #161B42; --text: #F7F2E8; --muted: #B9BCD6; --primary: #8FA3FF; --line: #2A3166; --note-bg: #3A3410; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.logo { font-size: 32px; font-weight: 800; color: var(--primary); text-decoration: none; letter-spacing: -0.5px; }
nav a { color: var(--primary); margin-left: 16px; font-weight: 600; text-decoration: none; }
nav a:first-child { margin-left: 0; }
h1 { font-size: 32px; line-height: 1.2; margin: 8px 0 8px; }
h2 { font-size: 22px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 20px; margin: 16px 0; }
.check { background: var(--note-bg); border-left: 4px solid var(--yellow); padding: 10px 14px; border-radius: 8px; margin: 12px 0; font-size: 15px; }
.fill { background: var(--note-bg); outline: 2px dashed var(--yellow); padding: 0 4px; border-radius: 4px; }
a { color: var(--primary); }
footer { margin-top: 48px; font-size: 14px; color: var(--muted); }