:root {
  --bg: #f7f3ea;
  --surface: #fffdf8;
  --surface-2: #f0eadc;
  --text: #2a2522;
  --muted: #7a6f66;
  --line: #e2d9c6;
  --accent: #8a2b1d;
  --accent-text: #fff;
  --good: #2f7a4b;
  --good-bg: #e3f2e7;
  --bad: #b23a2a;
  --bad-bg: #f9e2de;
  --learning: #d29b2b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(60, 40, 20, .06), 0 4px 16px rgba(60, 40, 20, .06);
  --serif: 'Noto Serif KR', 'Noto Serif CJK KR', 'Batang', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Pretendard', 'Malgun Gothic', 'Noto Sans KR', sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1816;
    --surface: #24201d;
    --surface-2: #2e2925;
    --text: #ece5db;
    --muted: #a39a90;
    --line: #3a342f;
    --accent: #e0745f;
    --accent-text: #1b1816;
    --good: #6cc48d;
    --good-bg: #1f3427;
    --bad: #f08a78;
    --bad-bg: #3d2420;
    --learning: #e3b551;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); word-break: keep-all; overflow-wrap: anywhere; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2 { line-height: 1.3; }
h1 { font-size: 1.6rem; margin: 1.5rem 0 1rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .8rem; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
kbd { font: 12px var(--sans); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px; padding: 0 5px; background: var(--surface); }
[hidden] { display: none !important; }

/* 헤더/푸터 */
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 12px; }
.logo { font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.logo:hover { text-decoration: none; }
.logo-mark { font-family: var(--serif); background: var(--accent); color: var(--accent-text); width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; font-size: 18px; }
.nav { display: flex; gap: 2px; }
.nav a { color: var(--muted); padding: 6px 10px; border-radius: 8px; font-size: .95rem; }
.nav a:hover { background: var(--surface-2); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); font-weight: 700; }
.site-footer { margin-top: 4rem; padding: 2rem 0; border-top: 1px solid var(--line); font-size: .85rem; }
.site-footer p { margin: .3rem 0; }

/* 버튼 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 0 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--text); font: inherit; font-weight: 600; cursor: pointer; text-decoration: none !important; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.good { background: var(--good-bg); border-color: var(--good); color: var(--good); }
.btn.bad { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); }
.btn.small { min-height: 36px; padding: 0 14px; }
.btn.wide { width: 100%; }
.btn.disabled { opacity: .5; cursor: default; }
.cta { display: flex; flex-wrap: wrap; gap: 8px; margin: 1.2rem 0; }
.reset-row { margin: -.4rem 0 0; }
.link-btn { border: 0; background: none; padding: 4px 0; font: inherit; font-size: .85rem; color: var(--muted); text-decoration: underline; cursor: pointer; }
.link-btn:hover { color: var(--bad); }
.chip { display: inline-block; padding: 4px 12px; border-radius: 999px; background: var(--bad-bg); color: var(--bad); font-size: .85rem; font-weight: 600; }

/* 홈 */
.hero { padding: 1rem 0 .5rem; }
.hero h1 { font-size: clamp(1.7rem, 5vw, 2.4rem); }
.lead { color: var(--muted); font-size: 1.05rem; max-width: 36em; }
.dashboard { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 1.5rem 0 .6rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; text-align: center; }
.stat b { display: block; font-size: 1.6rem; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: .85rem; }
.progress, .sb-track, .vl-bar { display: block; height: 6px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.progress i, .sb-track i, .vl-bar i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 99px; transition: width .3s; }
.howto { padding-left: 1.2rem; }
.howto li { margin: .4rem 0; }
.verse-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 8px; }
.verse-link { display: grid; grid-template-columns: auto 1fr; column-gap: 10px; align-items: center; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; color: var(--text); }
.verse-link:hover { border-color: var(--accent); text-decoration: none; }
.vl-n { grid-row: span 2; color: var(--muted); font-size: .8rem; min-width: 1.8em; text-align: right; font-variant-numeric: tabular-nums; }
.vl-hanja { font-family: var(--serif); font-size: 1.05rem; letter-spacing: .03em; white-space: nowrap; }
.vl-reading { color: var(--muted); font-size: .8rem; }
.vl-bar { grid-column: 1 / -1; margin-top: 6px; height: 3px; }
.verse-link.done { border-color: var(--good); }
.verse-link.done .vl-bar i { background: var(--good); }

/* 구절 페이지 */
.crumb { color: var(--muted); font-size: .9rem; margin: 1.2rem 0 0; }
.verse-title { display: flex; flex-direction: column; gap: 4px; margin: .6rem 0; }
.vt-hanja { font-family: var(--serif); font-size: clamp(2rem, 8vw, 2.8rem); letter-spacing: .08em; }
.vt-reading { font-size: 1.1rem; color: var(--muted); font-weight: 400; }
.verse-meaning { font-size: 1.1rem; background: var(--surface); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 0 10px 10px 0; }
.char-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 1.2rem 0; }
.char-card { position: relative; display: flex; flex-direction: column; align-items: center; padding: 14px 4px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.cc-hanja { font-family: var(--serif); font-size: clamp(2.2rem, 9vw, 3.2rem); line-height: 1.2; }
.cc-hunum { font-size: .95rem; text-align: center; word-break: keep-all; }
.cc-dot { position: absolute; top: 8px; right: 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
[data-status="learning"] .cc-dot { background: var(--learning); }
[data-status="mastered"] .cc-dot { background: var(--good); }
.pager { display: flex; justify-content: space-between; gap: 8px; margin-top: 2rem; font-family: var(--serif); }

/* 범위 선택 */
.range-picker { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin-bottom: 1rem; }
.rp-form { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.rp-form label { display: flex; align-items: center; gap: 6px; font-size: .9rem; color: var(--muted); }
select, .search { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; min-height: 36px; padding: 0 8px; }
.rp-quick { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 8px; font-size: .9rem; }

/* 세션 공통 */
.session-bar { display: flex; align-items: center; gap: 10px; font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; margin-bottom: 12px; }
.sb-track { flex: 1; }
.card-app, .quiz-app { max-width: 480px; margin: 0 auto; }
.empty, .summary { text-align: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 16px; }
.summary .cta, .empty .cta { justify-content: center; }
.hint { text-align: center; font-size: .8rem; margin-top: 1.5rem; }

/* 카드 */
.card { display: block; width: 100%; aspect-ratio: 4 / 3.4; perspective: 1000px; position: relative; border: 0; padding: 0; background: none; cursor: pointer; color: inherit; font: inherit; }
.card-face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); backface-visibility: hidden; transition: transform .35s; }
.card .back { transform: rotateY(180deg); }
.card.flipped .front { transform: rotateY(-180deg); }
.card.flipped .back { transform: rotateY(0); }
.card-hanja { font-family: var(--serif); font-size: clamp(5rem, 28vw, 8rem); line-height: 1.1; }
.card-hanja.sm { font-size: clamp(3rem, 16vw, 4.5rem); }
.card-hunum { font-size: 1.8rem; }
.card-ctx { margin-top: 12px; }
.card-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.card-actions .wide { grid-column: 1 / -1; }
.card-actions .btn { min-height: 52px; font-size: 1.05rem; }
.ctx { display: flex; flex-direction: column; align-items: center; padding: 10px; background: var(--surface-2); border-radius: 10px; color: var(--text); }
.ctx:hover { text-decoration: none; }
.ctx-hanja { font-family: var(--serif); font-size: 1.4rem; letter-spacing: .08em; }
.ctx-hanja mark { background: none; color: var(--accent); font-weight: 700; }
.ctx-reading { font-size: .85rem; color: var(--muted); }
.summary-chars { font-family: var(--serif); font-size: 1.8rem; letter-spacing: .15em; }

/* 퀴즈 */
.q-prompt { display: flex; flex-direction: column; align-items: center; gap: 6px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px 12px; box-shadow: var(--shadow); }
.q-hanja { font-family: var(--serif); font-size: clamp(4rem, 22vw, 6rem); line-height: 1.1; }
.q-hunum { font-size: 2rem; font-weight: 700; padding: 12px 0; }
.q-ask { color: var(--muted); font-size: .9rem; }
.q-options { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.q-opt { position: relative; min-height: 60px; padding: 8px 10px 8px 30px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; font: inherit; font-size: 1.05rem; color: var(--text); cursor: pointer; word-break: keep-all; }
.q-opt:hover:not(:disabled) { border-color: var(--accent); }
.q-opt kbd { position: absolute; left: 8px; top: 8px; color: var(--muted); }
.q-opt-hanja { font-family: var(--serif); font-size: 2.2rem; line-height: 1.2; }
.q-opt.correct { background: var(--good-bg); border-color: var(--good); color: var(--good); font-weight: 700; }
.q-opt.wrong { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); }
.q-feedback { margin-top: 12px; display: grid; gap: 10px; text-align: center; }
.q-feedback p { margin: 0; font-size: 1.05rem; }
.good-text { color: var(--good); font-weight: 700; }
.bad-text { color: var(--bad); }
.big-score { font-size: 2.6rem; font-weight: 700; color: var(--accent); margin: .2rem 0 1rem; }
.wrong-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; }
.wrong-list li { background: var(--bad-bg); border-radius: 8px; padding: 4px 10px; font-size: .9rem; }
.wrong-list span { font-family: var(--serif); font-size: 1.3rem; margin-right: 6px; }

/* 전체 목록 */
.search { width: 100%; min-height: 44px; padding: 0 12px; margin-bottom: 1rem; background: var(--surface); }
.list-verse h2 { font-size: 1rem; margin: 1.4rem 0 .5rem; font-family: var(--serif); }
.list-verse h2 small { font-family: var(--sans); color: var(--muted); font-weight: 400; margin-left: 6px; }
.list-verse ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.list-verse li { display: flex; align-items: center; gap: 8px; padding: 6px 10px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; font-size: .9rem; border-left: 4px solid var(--line); }
.list-verse li[data-status="learning"] { border-left-color: var(--learning); }
.list-verse li[data-status="mastered"] { border-left-color: var(--good); }
.li-hanja { font-family: var(--serif); font-size: 1.5rem; line-height: 1.2; }

/* 본문 */
.prose { max-width: 680px; }
.prose li { margin: .3rem 0; }

/* 광고: 버튼과 충분히 떨어뜨려 잘못 누르는 일이 없게 */
.ad { margin: 3rem 0 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); min-height: 100px; }

@media (max-width: 480px) {
  .logo { font-size: .95rem; }
  .nav a { padding: 6px 7px; }
  .char-grid { gap: 6px; }
  .cc-hunum { font-size: .8rem; }
  .list-verse ul { gap: 4px; }
  .list-verse li { flex-direction: column; gap: 0; padding: 6px 2px; font-size: .8rem; text-align: center; }
  .q-hunum { font-size: 1.6rem; }
}
@media (prefers-reduced-motion: reduce) {
  .card-face, .progress i, .sb-track i { transition: none; }
}