/* 폰에서 한 손으로 쓰는 것을 기준으로 잡았다. 데스크톱은 그 폭을 가운데 놓는다. */

:root {
  --ground: #f4f6f3;
  --surface: #ffffff;
  --surface-2: #eaeee9;
  --ink: #151a18;
  --ink-2: #3c443f;
  --muted: #6e7873;
  --rule: #dbe0da;
  --accent: #2c6a5c;
  --accent-soft: #e1ede8;
  --ok: #256b4e;
  --no: #9c3b2c;
  --warn: #8e5417;
  --warn-soft: #f5ecdf;

  --sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard",
    "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #101413;
    --surface: #171c1a;
    --surface-2: #1e2523;
    --ink: #e7ebe7;
    --ink-2: #bac3be;
    --muted: #8a948f;
    --rule: #2a322f;
    --accent: #74c3ac;
    --accent-soft: #1a2c27;
    --ok: #6fc79c;
    --no: #e08272;
    --warn: #d9a063;
    --warn-soft: #2a2118;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

/* ---------- 골격 ---------- */

.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  padding-top: max(0.7rem, env(safe-area-inset-top));
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}

.brand { font-weight: 600; text-decoration: none; color: var(--ink); letter-spacing: -0.01em; }

.bar nav { display: flex; gap: 1rem; }
.bar nav a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.bar nav a.on { color: var(--accent); font-weight: 600; }

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1rem 1rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

main.narrow { max-width: 34rem; }
main.center { min-height: 80vh; justify-content: center; }

.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
}

.stack { display: flex; flex-direction: column; gap: 0.9rem; }
.row { display: flex; gap: 0.6rem; align-items: center; }
.center { text-align: center; }

h1, h2 { margin: 0; text-wrap: balance; }
.title { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.01em; }
.section-title { font-size: 0.95rem; font-weight: 600; color: var(--ink-2); }
p { margin: 0; }

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

a { color: var(--accent); text-underline-offset: 0.15em; }

/* ---------- 버튼 ---------- */

button, .primary, .ghost {
  font: inherit;
  border-radius: var(--radius);
  border: 1px solid transparent;
  padding: 0.7rem 1rem;
  cursor: pointer;
}

.primary {
  background: var(--accent);
  color: var(--surface);
  border-color: var(--accent);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

.ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--rule);
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

.block { display: block; width: 100%; }
button:active { transform: translateY(1px); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

input[type="text"], input[type="password"], input[type="search"], select {
  font: inherit;
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--ground);
  color: var(--ink);
}

.typed { font-size: 1.15rem; }

.toggle {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--muted);
}
.toggle input { width: auto; }

/* ---------- 홈 ---------- */

.counts { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }

.count {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 0.9rem;
  text-align: center;
  text-decoration: none;
  color: var(--ink);
  display: block;
}
.count.accent { background: var(--accent-soft); }
.count b { display: block; font-size: 1.9rem; font-weight: 600; line-height: 1.2; }
.count span { font-size: 0.82rem; color: var(--muted); }

.facts { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.55rem 1rem; }
.facts div { display: flex; justify-content: space-between; gap: 0.5rem; border-bottom: 1px solid var(--rule); padding-bottom: 0.35rem; }
.facts dt { color: var(--muted); font-size: 0.86rem; }
.facts dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

.note {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  font-size: 0.88rem;
  color: var(--ink-2);
}
.note.warn { background: var(--warn-soft); color: var(--warn); }
.alert { color: var(--no); font-size: 0.9rem; }

/* ---------- 문제 ---------- */

.card-head { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }

.chip {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.prompt { font-size: 1.3rem; line-height: 1.55; white-space: pre-line; }
.prompt.recognition { font-size: 2rem; font-weight: 600; text-align: center; padding: 1.2rem 0; letter-spacing: -0.01em; }
.prompt.cloze, .prompt.production { font-size: 1.15rem; }

.hint { font-size: 0.9rem; color: var(--muted); }

.choices { display: flex; flex-direction: column; gap: 0.5rem; }

.choice {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--rule);
  color: var(--ink);
  line-height: 1.5;
}
.choice:hover { border-color: var(--accent); }
.choice kbd {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0 0.35rem;
  flex: none;
  margin-top: 0.15rem;
}

/* ---------- 채점 결과 ---------- */

.verdict { font-size: 1.1rem; font-weight: 600; }
.verdict.ok { color: var(--ok); }
.verdict.no { color: var(--no); }

.given { font-size: 0.9rem; color: var(--muted); }
.answer { font-size: 1.6rem; font-weight: 600; letter-spacing: -0.01em; }
.meaning { font-size: 1rem; color: var(--ink-2); }

.quote {
  margin: 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--accent);
  font-size: 0.95rem;
  line-height: 1.6;
}

.source { font-size: 0.8rem; color: var(--muted); }

/* ---------- 어휘 목록 ---------- */

.filters { display: grid; grid-template-columns: 1fr auto; gap: 0.5rem; }
.filters input[type="search"] { grid-column: 1 / -1; }
.count-line { padding-left: 0.2rem; }

.words { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.words li {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
}
.words li a { text-decoration: none; color: var(--ink); min-width: 0; }
.w-display { display: block; font-weight: 600; }
.w-meaning { display: block; font-size: 0.85rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.w-tags { display: flex; gap: 0.3rem; flex: none; }
.empty { color: var(--muted); justify-content: center; }

.tag {
  font-size: 0.68rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--muted);
  white-space: nowrap;
}
.tag.core { background: var(--accent-soft); color: var(--accent); }
.tag.known-mark { background: var(--warn-soft); color: var(--warn); }

.pager { display: flex; align-items: center; justify-content: center; gap: 1rem; }

.occurrences { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.85rem; }

/* ---------- 표·막대 ---------- */

.log { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.log th, .log td { text-align: left; padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--rule); }
.log th { color: var(--muted); font-weight: 500; font-size: 0.75rem; }
.log td { font-variant-numeric: tabular-nums; }
.log td.ok { color: var(--ok); font-weight: 600; }
.log td.no { color: var(--no); font-weight: 600; }

.bars { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.bars li { display: grid; grid-template-columns: 5.5rem 1fr 4.5rem; gap: 0.6rem; align-items: center; font-size: 0.85rem; }
.bar { background: var(--surface-2); border-radius: 999px; height: 0.5rem; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); }
.bar-value { text-align: right; font-variant-numeric: tabular-nums; }
.bar-label { color: var(--muted); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ---------- 쓰기 ---------- */

textarea {
  font: inherit;
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--ground);
  color: var(--ink);
  line-height: 1.7;
  resize: vertical;
}

.task-words { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.task-words li { display: flex; gap: 0.6rem; align-items: baseline; flex-wrap: wrap; }
.task-words a { text-decoration: none; }
.task-words b { font-size: 1.05rem; }

.feedback {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  font-size: 0.93rem;
  line-height: 1.7;
  white-space: pre-wrap;
}

.mnemonic {
  background: var(--warn-soft);
  border-radius: var(--radius);
  padding: 0.8rem 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
  font-size: 0.93rem;
}
.mnemonic .chip { background: transparent; color: var(--warn); padding-left: 0; }