:root {
  --bg: #fbfaf7; --card: #ffffff; --text: #1f2328; --muted: #6b7076; --line: #e6e2da;
  --accent: #2f6f5e; --accent-soft: #e3f0eb; --code: #f3f1ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a; --card: #1f2225; --text: #e8e6e3; --muted: #9aa0a6; --line: #33373b;
    --accent: #7cc4ad; --accent-soft: #24352f; --code: #2a2d31;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: Pretendard, -apple-system, "Apple SD Gothic Neo", sans-serif;
  font-size: 17px; line-height: 1.75; word-break: keep-all;
}
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 48px; }
a { color: var(--accent); }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 16px 40px; }

/* 첫 화면 */
.hero h1 { font-size: 28px; margin: 16px 0 8px; }
.hero p { color: var(--muted); margin: 0 0 16px; }
.progress { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; }
.progress div { height: 100%; background: var(--accent); }
.count { font-size: 14px; margin-top: 6px !important; }
.today {
  display: block; margin: 24px 0 32px; padding: 20px; border-radius: 16px;
  background: var(--accent); color: #fff; text-decoration: none;
}
@media (prefers-color-scheme: dark) { .today { color: #10201b; } }
.today span { font-size: 14px; opacity: .85; display: block; }
.today strong { font-size: 21px; }
h2 { font-size: 20px; margin: 32px 0 12px; }
.cat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 14px; }
.cat h3 { margin: 0; font-size: 18px; }
.cat h3 small { color: var(--muted); font-weight: 400; font-size: 14px; }
.cat .desc { margin: 2px 0 8px; color: var(--muted); font-size: 14px; }
.cat ul { list-style: none; padding: 0; margin: 0; }
.cat li { padding: 7px 0; border-top: 1px solid var(--line); font-size: 16px; }
.cat li a { text-decoration: none; color: var(--text); display: block; }
.cat li a:hover { color: var(--accent); }
.cat .d { display: inline-block; min-width: 64px; color: var(--accent); font-size: 14px; font-weight: 600; }
.cat .soon { color: var(--muted); }
.cat .soon .d { color: var(--muted); font-weight: 400; }
.cat .soon small { margin-left: 8px; font-size: 12px; border: 1px solid var(--line); border-radius: 99px; padding: 1px 8px; }

/* 레슨 화면 */
.back { font-size: 15px; text-decoration: none; }
.lesson-head { margin: 16px 0 8px; }
.lesson-head h1 { font-size: 30px; line-height: 1.35; margin: 8px 0 0; }
.meta { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-size: 14px; align-items: center; }
.chip { background: var(--accent-soft); color: var(--accent); padding: 2px 10px; border-radius: 99px; font-weight: 600; }
article h2 { font-size: 22px; margin: 36px 0 10px; }
article h3 { font-size: 19px; }
article blockquote {
  margin: 16px 0; padding: 12px 16px; background: var(--accent-soft);
  border-left: 4px solid var(--accent); border-radius: 0 10px 10px 0;
}
article blockquote p { margin: 4px 0; }
article hr { border: none; border-top: 1px solid var(--line); margin: 28px 0; }
article table { width: 100%; border-collapse: collapse; font-size: 15px; display: block; overflow-x: auto; }
article th, article td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
article th { background: var(--code); }
article td:first-child { white-space: nowrap; }
article pre {
  background: var(--code); padding: 14px 16px; border-radius: 10px;
  white-space: pre-wrap; font-size: 15px; line-height: 1.6;
}
article pre code { font-family: inherit; font-size: 15px; }
article code { font-family: ui-monospace, Menlo, monospace; font-size: .9em; }
article :not(pre) > code { background: var(--code); padding: 1px 6px; border-radius: 5px; }
article details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; }
article summary { cursor: pointer; font-weight: 600; color: var(--accent); }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 40px; font-size: 15px; }
.pager a { text-decoration: none; }