/* AXIS 학습 세션 — 공통 스타일 (화이트 + 레드 포인트, 기관 홈페이지 톤) */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;700;800;900&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --text: #333333;
  --text-dim: #616a7f;
  --heading: #2a323d;
  --accent: #eb3a3e;          /* 레드 포인트 */
  --accent-dark: #c72f33;
  --accent-glow: rgba(235,58,62,0.07);
  --accent2: #2a323d;         /* 보조 — 네이비 그레이 */
  --accent2-glow: rgba(42,50,61,0.06);
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --card-hover: #fdf6f6;
  --ok: #059669;
  --ok-glow: rgba(5,150,105,0.08);
  --wrong: #dc2626;
  --wrong-glow: rgba(220,38,38,0.07);
  --warn: #d97706;
  --shadow: 0 1px 3px rgba(42,50,61,0.06), 0 4px 14px rgba(42,50,61,0.05);
  --shadow-lift: 0 4px 10px rgba(42,50,61,0.08), 0 10px 28px rgba(42,50,61,0.08);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans KR', 'Pretendard', -apple-system, 'Malgun Gothic', sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 8%, var(--accent-glow), transparent 34%),
    radial-gradient(circle at 88% 90%, var(--accent2-glow), transparent 38%);
  z-index: -1;
}

.wrap { max-width: 900px; margin: 0 auto; padding: 3rem 2rem 8rem; }
.wrap.wide { max-width: 1200px; }

/* 상단 네비 */
.topnav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 1rem;
  padding: 0.9rem 2rem;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--accent);
  font-size: 0.92rem;
}
.topnav a { color: var(--accent); text-decoration: none; font-weight: 700; }
.topnav a:hover { color: var(--accent-dark); text-decoration: underline; }
.topnav .mod-label { color: var(--text-dim); letter-spacing: 0.04em; }

/* 타이포 */
h1 {
  font-size: 2.3rem; font-weight: 900; line-height: 1.3; margin: 1rem 0 1.1rem;
  color: var(--heading);
}
h1::after {
  content: ''; display: block; width: 56px; height: 5px; margin-top: 0.7rem;
  background: linear-gradient(90deg, var(--accent), #f0898c); border-radius: 3px;
}
h2 { font-size: 1.5rem; font-weight: 800; margin: 3.2rem 0 1rem; color: var(--heading); }
h2 .num { color: var(--accent); margin-right: 0.55rem; font-weight: 900; }
h3 { font-size: 1.13rem; font-weight: 700; margin: 1.8rem 0 0.6rem; color: var(--accent); }
p { margin: 0.85rem 0; }
strong { color: var(--heading); }
em { color: var(--accent-dark); font-style: normal; }
.lead { color: var(--text-dim); font-size: 1.05rem; }

.badge {
  display: inline-block; padding: 0.28rem 0.95rem; border-radius: 100px;
  background: var(--accent); color: #fff;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em;
}

/* 카드 */
.card {
  padding: 1.4rem 1.5rem; margin: 1.1rem 0;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
a.card { display: block; color: inherit; text-decoration: none; }
a.card:hover {
  transform: translateY(-3px);
  border-color: rgba(235,58,62,0.45);
  box-shadow: var(--shadow-lift);
}

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.1rem; }

/* 콘텐츠 박스 */
.analogy {
  border-left: 4px solid var(--accent2);
  background: var(--bg-soft);
  padding: 1rem 1.3rem; margin: 1.2rem 0; border-radius: 0 12px 12px 0;
}
.analogy::before { content: '💡 비유'; display: block; font-size: 0.8rem; color: var(--accent2); font-weight: 800; margin-bottom: 0.3rem; letter-spacing: 0.05em; }

.axis-box {
  border: 1px solid rgba(235,58,62,0.28);
  background: var(--accent-glow);
  padding: 1rem 1.3rem; margin: 1.2rem 0; border-radius: 12px;
}
.axis-box::before { content: '🔗 우리 연구회에선'; display: block; font-size: 0.8rem; color: var(--accent); font-weight: 800; margin-bottom: 0.3rem; letter-spacing: 0.05em; }

.keypoints { list-style: none; margin: 1rem 0; }
.keypoints li { padding: 0.5rem 0 0.5rem 1.8rem; position: relative; }
.keypoints li::before { content: '✓'; position: absolute; left: 0.3rem; color: var(--accent); font-weight: 900; }

/* 표 */
table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: 0.95rem; background: #fff; }
th { background: var(--heading); color: #fff; text-align: left; padding: 0.7rem 0.9rem; font-weight: 700; }
td { padding: 0.68rem 0.9rem; border-bottom: 1px solid var(--card-border); }
tr:hover td { background: var(--bg-soft); }
.table-scroll { overflow-x: auto; border-radius: 10px; border: 1px solid var(--card-border); }
.table-scroll table { margin: 0; }

code {
  font-family: 'Cascadia Code', Consolas, monospace;
  background: var(--bg-soft); border: 1px solid var(--card-border);
  padding: 0.12rem 0.42rem; border-radius: 6px; font-size: 0.87em; color: var(--accent-dark);
}
pre {
  background: #2a323d; border-radius: 12px;
  padding: 1rem 1.2rem; overflow-x: auto; margin: 1rem 0;
}
pre code { background: none; border: none; padding: 0; color: #e8eaee; }

/* ── 퀴즈 (단계형) ─────────────────────────────────────────── */
#quiz { margin-top: 3rem; }
.quiz-shell {
  border: 1px solid var(--card-border); border-radius: 18px;
  background: var(--card-bg); box-shadow: var(--shadow);
  padding: 1.6rem 1.7rem; margin-top: 1rem;
}
.quiz-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 0.9rem; }
.quiz-step { font-size: 0.85rem; font-weight: 800; color: var(--accent); letter-spacing: 0.05em; }
.quiz-attempts { font-size: 0.8rem; color: var(--text-dim); }
.quiz-bar { height: 7px; background: var(--bg-soft); border-radius: 100px; overflow: hidden; margin-bottom: 1.4rem; }
.quiz-bar > div { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), #f0898c); border-radius: 100px; transition: width 0.35s ease; }
.quiz-q .qtext { font-weight: 800; color: var(--heading); margin-bottom: 1rem; font-size: 1.06rem; line-height: 1.6; }
.quiz-opt {
  display: block; width: 100%; text-align: left;
  padding: 0.8rem 1.05rem; margin: 0.5rem 0;
  background: #fff; border: 1.5px solid var(--card-border);
  border-radius: 12px; color: var(--text); font: inherit; cursor: pointer;
  transition: border-color 0.18s, background 0.18s, transform 0.18s;
}
.quiz-opt:hover:not(:disabled) { border-color: rgba(235,58,62,0.55); background: var(--card-hover); transform: translateX(3px); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { border-color: var(--ok); background: var(--ok-glow); color: var(--heading); font-weight: 700; }
.quiz-opt.wrong { border-color: var(--wrong); background: var(--wrong-glow); color: var(--text-dim); }
.quiz-feedback {
  display: none; margin-top: 1rem; padding: 0.95rem 1.15rem;
  border-radius: 12px; font-size: 0.93rem; white-space: pre-line;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.bad { border-left: 4px solid var(--wrong); background: var(--wrong-glow); }
.quiz-feedback.good { border-left: 4px solid var(--ok); background: var(--ok-glow); }
.quiz-next {
  display: none; margin-top: 1.2rem; padding: 0.75rem 1.6rem;
  background: var(--accent); color: #fff; border: none; border-radius: 100px;
  font: inherit; font-weight: 800; cursor: pointer; transition: background 0.18s, transform 0.18s;
}
.quiz-next:hover { background: var(--accent-dark); transform: translateY(-1px); }
.quiz-next.show { display: inline-block; }
.quiz-finish { text-align: center; padding: 1.5rem 0 0.5rem; }
.quiz-finish .score { font-size: 2.6rem; font-weight: 900; color: var(--accent); }
.quiz-finish .score small { font-size: 1.1rem; color: var(--text-dim); font-weight: 700; }
.quiz-finish .verdict { margin: 0.4rem 0 1.2rem; font-weight: 700; color: var(--heading); }
.quiz-review { text-align: left; margin-top: 1.4rem; }
.quiz-review h3 { margin-top: 0; }
.quiz-review .rv {
  border: 1px solid var(--card-border); border-left: 4px solid var(--warn);
  border-radius: 10px; padding: 0.8rem 1rem; margin: 0.6rem 0; font-size: 0.92rem;
}
.quiz-review .rv .rq { font-weight: 700; color: var(--heading); }
.quiz-review .rv .ra { color: var(--ok); font-weight: 700; }
.quiz-retry {
  margin-top: 1.2rem; padding: 0.7rem 1.5rem; background: #fff;
  border: 1.5px solid var(--card-border); border-radius: 100px;
  font: inherit; font-weight: 700; color: var(--text); cursor: pointer;
}
.quiz-retry:hover { border-color: var(--accent); color: var(--accent); }

/* 이전/다음 네비 */
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3.5rem; }
.pager a {
  flex: 1; padding: 1rem 1.3rem; border-radius: 12px;
  border: 1px solid var(--card-border); background: var(--card-bg);
  color: var(--text); text-decoration: none; box-shadow: var(--shadow);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.pager a:hover { border-color: rgba(235,58,62,0.45); box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.pager a.next { text-align: right; }
.pager .dir { display: block; font-size: 0.78rem; color: var(--accent); font-weight: 700; }

/* 허브 전용 */
.hero { text-align: center; padding: 4rem 0 2rem; }
.hero h1 { font-size: 2.8rem; }
.hero h1::after { margin-left: auto; margin-right: auto; }
.stats { display: flex; gap: 1rem; justify-content: center; margin: 2rem 0; flex-wrap: wrap; }
.stat-card {
  padding: 1.1rem 1.8rem; border-radius: 14px;
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-top: 3px solid var(--accent); box-shadow: var(--shadow); text-align: center;
}
.stat-card .num { font-size: 1.7rem; font-weight: 900; color: var(--accent); display: block; }
.stat-card .label { font-size: 0.82rem; color: var(--text-dim); }
.mod-card .emoji { font-size: 1.6rem; }
.mod-card .mod-num { font-size: 0.74rem; color: var(--accent); font-weight: 800; letter-spacing: 0.1em; margin-top: 0.4rem; }
.mod-card .mod-title { font-weight: 800; color: var(--heading); margin: 0.2rem 0 0.4rem; }
.mod-card .mod-desc { font-size: 0.88rem; color: var(--text-dim); }
.mod-card .done { color: var(--ok); font-size: 0.85rem; font-weight: 800; }

footer { margin-top: 5rem; text-align: center; color: var(--text-dim); font-size: 0.85rem; }

/* 심화 학습 링크 박스 */
.further {
  margin: 1.4rem 0; padding: 0.95rem 1.2rem;
  border: 1px dashed rgba(42,50,61,0.3); border-radius: 12px;
  background: var(--bg-soft);
  font-size: 0.9rem; color: var(--text-dim);
}
.further::before { content: '↗ 심화 학습'; display: block; font-size: 0.75rem; color: var(--accent); font-weight: 800; letter-spacing: 0.06em; margin-bottom: 0.35rem; }
.further a { color: var(--accent2); font-weight: 700; text-decoration: underline; text-decoration-color: rgba(42,50,61,0.3); text-underline-offset: 3px; }
.further a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.further .note { font-size: 0.8rem; opacity: 0.85; }

/* 용어사전 */
.gloss-search {
  width: 100%; padding: 0.85rem 1.15rem; margin: 1rem 0 1.5rem;
  background: #fff; border: 1.5px solid var(--card-border);
  border-radius: 12px; color: var(--text); font: inherit; box-shadow: var(--shadow);
}
.gloss-search:focus { outline: none; border-color: var(--accent); }
.gloss-item { padding: 0.9rem 1.1rem; margin: 0.55rem 0; background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; box-shadow: var(--shadow); }
.gloss-item dt { font-weight: 800; color: var(--accent); }
.gloss-item dd { margin: 0.3rem 0 0; font-size: 0.94rem; }
.gloss-item .mod-link { font-size: 0.8rem; color: var(--accent2); font-weight: 700; text-decoration: none; margin-left: 0.4rem; }
.gloss-item .mod-link:hover { color: var(--accent); }
.gloss-cat { margin-top: 2rem; }

@media (max-width: 768px) {
  .wrap { padding: 2rem 1.2rem 5rem; }
  h1 { font-size: 1.7rem; }
  .hero h1 { font-size: 1.9rem; }
  h2 { font-size: 1.3rem; }
  .pager { flex-direction: column; }
}

/* 용어사전 자동 링크 — 은은한 회색 점선 */
.gloss-link {
  color: inherit;
  text-decoration: underline dotted 1px;
  text-decoration-color: #b9bfc9;
  text-underline-offset: 3px;
}
.gloss-link:hover { color: var(--accent-dark); text-decoration-color: var(--accent); text-decoration-style: solid; }

/* 사전 도착 시 해당 정의 강조 */
.gloss-item:target {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  scroll-margin-top: 5rem;
}

/* 용어사전 → 읽던 곳으로 복귀 */
#back-pill {
  position: fixed; left: 50%; bottom: 1.4rem; transform: translateX(-50%);
  padding: 0.65rem 1.4rem; border-radius: 100px; z-index: 60;
  background: var(--accent); color: #fff; text-decoration: none; font-weight: 800; font-size: 0.92rem;
  box-shadow: 0 6px 20px rgba(235,58,62,0.35);
}
#back-pill:hover { background: var(--accent-dark); }
.gloss-link { scroll-margin-top: 5rem; }

/* 정답 후 탐색 모드 — 해설 열람 표시 */
.quiz-opt.viewed { border-style: dashed; border-color: #b9bfc9; color: var(--text-dim); }
.quiz-feedback.info { border-left: 4px solid var(--accent2); background: var(--accent2-glow); }