/* 사이트 공통 — 따뜻한 종이색 바탕에 짙은 초록 포인트 */
:root {
  --ink: #3d3329;
  --ink-soft: #6f6357;
  --muted: #938678;
  --soft: #9a8c7d;
  --line: #e4e0da;
  --line-strong: #d6cec3;
  --line-soft: #efe9e0;
  --bg: #f9f8f6;
  --surface: #fffdfa;
  --surface-soft: #f3eee6;
  --green: #2f6b4f;
  --green-dark: #23523c;
  --green-soft: #eaf2ec;
  --gold: #b99861;
  --accent: var(--green);
  --accent-dark: var(--green-dark);
  --accent-soft: var(--green-soft);
  --card: var(--surface);
  --radius: 18px;
  --shadow-sm: 0 1px 2px rgba(61, 51, 41, .05), 0 2px 6px rgba(61, 51, 41, .04);
  --shadow: 0 24px 60px -40px rgba(61, 51, 41, .5);
  --font: "Pretendard", "Malgun Gothic", "맑은 고딕", "Apple SD Gothic Neo", "Noto Sans KR", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  word-break: keep-all;
}
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; letter-spacing: -.02em; }
button, select, input { font-family: inherit; font-size: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; border-radius: 6px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ── 머리말 ───────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 253, 250, .94);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.app-header .inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  height: 62px;
  display: flex;
  align-items: center;
  gap: 26px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: var(--green); color: #fff;
  display: grid; place-items: center;
  font-size: 15px; font-weight: 800;
}
.brand small { display: block; font-size: 12px; font-weight: 600; color: var(--ink-soft); letter-spacing: .02em; }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a {
  padding: 8px 12px; border-radius: 8px;
  color: var(--ink-soft); font-size: 14px; font-weight: 600;
}
.nav a[aria-current="page"], .nav a:hover { background: var(--green-soft); color: var(--green-dark); text-decoration: none; }
.header-cta {
  padding: 9px 16px; border-radius: 10px;
  background: var(--green); color: #fff; font-weight: 700; font-size: 13.5px;
}
.header-cta:hover { background: var(--green-dark); text-decoration: none; }

/* ── 첫 화면 ─────────────────────────────────────── */
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.hero { padding: 56px 0 32px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); gap: 48px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--green-soft); color: var(--green-dark);
  font-size: 12px; font-weight: 700;
}
.hero h1 { font-size: 42px; line-height: 1.22; margin: 18px 0 0; letter-spacing: -.035em; }
.hero h1 em { font-style: normal; color: var(--green); }
.hero p.lead { margin: 16px 0 0; font-size: 16.5px; color: var(--ink-soft); line-height: 1.75; }
.hero-actions { display: flex; gap: 10px; margin-top: 26px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 11px 18px; border-radius: 11px;
  border: 1px solid transparent; background: #fff;
  font-weight: 700; font-size: 14px; cursor: pointer;
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--green); color: #fff; }
.btn--primary:hover { background: var(--green-dark); text-decoration: none; }
.btn--ghost { border-color: var(--line-strong); color: var(--ink-soft); }
.btn--ghost:hover { border-color: var(--green); color: var(--green-dark); text-decoration: none; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

.hero-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 20px; box-shadow: var(--shadow);
  padding: 18px;
}
.hero-card .mini-sheet {
  border: 1px solid var(--line); border-radius: 12px; padding: 20px 18px 16px; background: #fff;
}
.mini-sheet .ms-title { font-size: 13px; font-weight: 800; text-align: center; color: var(--ink); }
.mini-sheet .ms-sub { font-size: 10px; color: var(--soft); text-align: center; margin-bottom: 14px; }
.mini-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px 18px; font-size: 12.5px; font-variant-numeric: tabular-nums; }
.mini-grid div { display: flex; gap: 6px; align-items: baseline; }
.mini-grid span:nth-child(2) { flex: 1; border-bottom: 1px dotted #cfc6b8; }
.hero-card .cap { margin: 12px 4px 0; font-size: 12px; color: var(--soft); }

.section { padding: 40px 0; }
.section-head { margin-bottom: 20px; }
.section-head h2 { font-size: 25px; }
.section-head p { margin: 8px 0 0; color: var(--ink-soft); }
.grade-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; }
.grade-card {
  display: block; padding: 18px 16px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--line); color: var(--ink);
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.grade-card:hover { text-decoration: none; border-color: var(--green); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.grade-card .g { font-size: 25px; font-weight: 800; color: var(--green); letter-spacing: -.035em; }
.grade-card .t { font-size: 12.5px; color: var(--ink-soft); margin-top: 2px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.feature {
  background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  padding: 20px;
}
.feature h3 { font-size: 15.5px; }
.feature p { margin: 8px 0 0; color: var(--ink-soft); font-size: 13.5px; }
.feature .ico { font-size: 19px; margin-bottom: 8px; }

.note {
  border-left: 3px solid var(--green);
  background: var(--surface); padding: 14px 16px; border-radius: 0 12px 12px 0;
  color: var(--ink-soft); font-size: 13.5px;
}

/* ── 단원 안내 ───────────────────────────────────── */
.curriculum { padding: 32px 24px 60px; }
.sem-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 16px;
  padding: 20px; margin-bottom: 14px;
}
.sem-card h3 { font-size: 16.5px; display: flex; align-items: center; gap: 10px; }
.sem-card h3 .tag {
  font-size: 10.5px; font-weight: 700; padding: 3px 8px; border-radius: 999px;
  background: var(--green-soft); color: var(--green-dark);
}
.unit-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 13.5px; }
.unit-table th, .unit-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.unit-table th { font-size: 11px; color: var(--soft); font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.unit-table td.no { width: 40px; color: var(--soft); font-variant-numeric: tabular-nums; }
.unit-table td.name { font-weight: 700; width: 190px; }
.unit-table td.desc { color: var(--ink-soft); }
.unit-table a.make { font-size: 12.5px; font-weight: 700; white-space: nowrap; }

/* ── 안내 문서 ───────────────────────────────────── */
.doc { max-width: 840px; margin: 0 auto; padding: 40px 24px 72px; }
.doc h1 { font-size: 31px; }
.doc h2 { font-size: 19px; margin: 34px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 15.5px; margin: 20px 0 8px; }
.doc p, .doc li { color: var(--ink-soft); font-size: 14.5px; }
.doc ul, .doc ol { padding-left: 20px; }
.doc li { margin: 5px 0; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13.5px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 9px 11px; text-align: left; vertical-align: top; }
.doc th { background: var(--surface-soft); font-size: 12px; }
.doc code { background: var(--surface-soft); padding: 1px 6px; border-radius: 5px; font-size: 12.5px; }
.doc .lead { font-size: 16px; }

/* ── 꼬리말 ───────────────────────────────────────── */
.app-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 28px 0 36px;
  color: var(--soft);
  font-size: 12.5px;
}
.app-footer .inner {
  max-width: 1240px; margin: 0 auto; padding: 0 24px;
  display: flex; flex-wrap: wrap; gap: 18px 32px;
  justify-content: space-between;
}
.app-footer a { color: var(--ink-soft); font-weight: 600; }
.foot-links { display: flex; gap: 18px; flex-wrap: wrap; }

/* 앵커로 이동할 때 고정 머리말에 가리지 않도록 여백을 둔다 (모바일은 머리말이 두 줄이라 더 크게) */
[id] { scroll-margin-top: 84px; }
@media (max-width: 720px) { [id] { scroll-margin-top: 104px; } }

.guide-teaser { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 24px 26px; }
.guide-teaser h2 { font-size: 25px; }
.guide-teaser > p { margin: 8px 0 0; color: var(--ink-soft); }
.guide-teaser ul { margin: 14px 0 0; padding-left: 20px; }
.guide-teaser li { margin: 6px 0; color: var(--ink-soft); font-size: 14px; }
.guide-teaser > p:last-child { margin: 16px 0 0; }
.domain-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
@media (max-width: 1080px) { .domain-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 720px)  { .domain-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .grade-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: minmax(0, 1fr); }
  .hero h1 { font-size: 33px; }
}
@media (max-width: 720px) {
  .app-header .inner { padding: 0 16px; gap: 12px; }
  /* 좁은 화면에서도 주요 메뉴에 닿을 수 있게 두 번째 줄로 내린다. */
  .app-header .inner { height: auto; flex-wrap: wrap; padding-top: 8px; gap: 8px 12px; }
  .nav { display: flex; order: 3; width: 100%; margin: 0; gap: 12px; overflow-x: auto; padding-bottom: 8px; }
  .nav a { padding: 4px 0; font-size: 13px; white-space: nowrap; }
  .brand small { display: none; }
  .wrap, .curriculum { padding-left: 16px; padding-right: 16px; }
  .hero { padding: 32px 0 20px; }
  .hero h1 { font-size: 26px; }
  .grade-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc { padding: 24px 16px 48px; }
  .doc h1 { font-size: 23px; }
  .unit-table td.name { width: auto; }
}

/* 단원 페이지·첫 화면의 생성기 iframe: 좁은 화면에서는 iframe 대신 안내를 보여 준다 */
.unit-embed-note { display: none; font-size: 13px; color: var(--ink-soft); margin: 10px 0 0; }
@media (max-width: 900px) { .unit-embed { display: none; } .unit-embed-note { display: block; } }