:root {
  --bg: #F3F5F9; --surface: #FFFFFF; --text: #141A23; --text2: #5B6472; --line: #E4E8EF; --accent: #1769C2;
  --todo-bg: #FFF6E5; --todo-text: #7A4A00;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0F1217; --surface: #181C22; --text: #EEF1F5; --text2: #9AA3AE; --line: #2A3038; --accent: #6AB0F5;
          --todo-bg: #2B2416; --todo-text: #F2C46B; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 15px/1.75 "IBM Plex Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
article { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 28px 22px; }
h1 { font-size: 26px; line-height: 1.35; margin: 0 0 4px; letter-spacing: -0.3px; }
h2 { font-size: 17px; margin: 32px 0 8px; }
p, li { color: var(--text); }
ol, ul { padding-left: 22px; }
.meta { color: var(--text2); font-size: 14px; margin: 0 0 20px; }
.summary { background: var(--bg); border-radius: 14px; padding: 14px 16px; margin: 16px 0 8px; }
.summary li { margin: 2px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--bg); font-weight: 600; }
a { color: var(--accent); }
.todo { background: var(--todo-bg); color: var(--todo-text); border-radius: 4px; padding: 0 4px; }
footer { color: var(--text2); font-size: 13px; margin-top: 24px; line-height: 1.7; }
nav { margin-bottom: 16px; font-size: 14px; }
nav a { margin-right: 14px; text-decoration: none; }