/* 세계관 노트 공용 스타일. 색은 토큰으로만 쓴다. 모서리는 10px 하나로 통일. */
:root {
  --bg: #f4f4f5; --surface: #ffffff; --surface-2: #fafafa;
  --ink: #18181b; --sub: #52525b; --faint: #71717a; --line: #e4e4e7;
  --accent: #2f4fbf; --accent-ink: #ffffff; --accent-soft: #e8ecfa;
  --star: #b7791f; --ok: #2f7d4f; --lock: #a1a1aa;
  --radius: 10px; --shadow: 0 1px 2px rgb(24 24 27 / .06), 0 4px 16px rgb(24 24 27 / .05);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111113; --surface: #1b1b1e; --surface-2: #202024;
    --ink: #ececee; --sub: #b4b4bb; --faint: #8b8b93; --line: #2e2e33;
    --accent: #8ea3f2; --accent-ink: #0f1430; --accent-soft: #232a46;
    --star: #e2b356; --ok: #6cc391; --lock: #5c5c63;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 4px 16px rgb(0 0 0 / .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111113; --surface: #1b1b1e; --surface-2: #202024;
  --ink: #ececee; --sub: #b4b4bb; --faint: #8b8b93; --line: #2e2e33;
  --accent: #8ea3f2; --accent-ink: #0f1430; --accent-soft: #232a46;
  --star: #e2b356; --ok: #6cc391; --lock: #5c5c63; color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 "Pretendard Variable", Pretendard, "Malgun Gothic", system-ui, sans-serif;
  word-break: keep-all; overflow-wrap: anywhere;
}
a { color: var(--accent); }
button, input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { font-weight: 800; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -.02em; }
.nav nav { display: flex; gap: 4px; margin-left: auto; }
.nav nav a, .nav nav button { padding: 6px 12px; border-radius: var(--radius); color: var(--sub); text-decoration: none;
  background: none; border: 0; cursor: pointer; font-size: 15px; }
.nav nav a:hover, .nav nav button:hover, .nav nav .on { background: var(--surface); color: var(--ink); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; white-space: nowrap;
  padding: 11px 18px; border-radius: var(--radius); border: 1px solid transparent; cursor: pointer;
  font-weight: 700; text-decoration: none; transition: transform .12s ease, background .2s ease; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--faint); }
.btn.small { padding: 6px 12px; font-size: 14px; font-weight: 600; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.muted { color: var(--sub); }
.faint { color: var(--faint); font-size: 14px; }
.star { color: var(--star); font-weight: 800; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent);
  font-size: 12px; font-weight: 700; }
.hidden { display: none !important; }

/* 질문 카드: 앱과 소개 페이지가 같이 쓴다 */
.qcard { padding: 22px 22px 18px; }
.qcard .qhead { display: flex; gap: 10px; align-items: baseline; }
.qcard .qn { color: var(--accent); font-weight: 800; min-width: 40px; }
.qcard h2, .qcard h3 { margin: 0; font-size: 21px; line-height: 1.45; letter-spacing: -.01em; }
.qcard .why { margin: 6px 0 14px 50px; color: var(--sub); font-size: 15px; }
.qcard .body { margin-left: 50px; }
.ex { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.ex > div { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; font-size: 15px; }
.ex b { display: block; font-size: 12px; color: var(--faint); margin-bottom: 2px; }
.ex p { margin: 0; }
@media (max-width: 640px) {
  .qcard .why, .qcard .body { margin-left: 0; }
  .ex { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: no-preference) {
  .rise { animation: rise .45s cubic-bezier(.16, 1, .3, 1) both; }
  @keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
}