/* AI Weekly — 토큰과 규칙은 DESIGN.md */
:root {
  --ink: #1D1D1F; --ink-2: #6E6E73; --paper: #FFFFFF; --paper-2: #F5F5F7;
  --line: #D2D2D7; --accent: #4B4DED; --accent-ink: #FFFFFF;
  --font: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", system-ui, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #F5F5F7; --ink-2: #A1A1A6; --paper: #000000; --paper-2: #1C1C1E; --line: #38383A; --accent: #7C7EFF; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font);
  font-size: 17px; line-height: 1.5; word-break: keep-all; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 640px; margin: 0 auto; padding: 0 20px; }

/* 머리말·꼬리말 */
.top { display: flex; align-items: center; height: 56px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; letter-spacing: -0.02em; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand img { width: 26px; height: 26px; }
.foot { margin: 72px auto 40px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--ink-2); font-size: 13px; }
.foot p { margin: 4px 0; }
.foot a { color: var(--ink-2); text-decoration: underline; }

/* 글자 */
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 40px 0 12px; }
h2 { font-size: 22px; line-height: 1.25; letter-spacing: -0.01em; margin: 40px 0 12px; }
.lead { font-size: 19px; color: var(--ink-2); margin: 0 0 28px; }
.muted { color: var(--ink-2); font-size: 15px; }
.eyebrow { font-size: 13px; font-weight: 600; color: var(--ink-2); letter-spacing: 0.02em; margin: 0; }

/* 버튼과 카드 */
.btn {
  display: flex; align-items: center; justify-content: center; width: 100%; min-height: 52px;
  border: 0; border-radius: 14px; background: var(--accent); color: var(--accent-ink);
  font: 600 17px/1.2 var(--font); cursor: pointer; padding: 0 20px; text-decoration: none;
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.btn.ghost { background: var(--paper-2); color: var(--ink); }
.btn + .btn { margin-top: 10px; }
.card { display: block; background: var(--paper-2); border-radius: 20px; padding: 24px; color: var(--ink); }
.card:hover { text-decoration: none; }
.card h2 { margin: 6px 0 6px; }
.card p { margin: 0; }
.card .go { display: inline-block; margin-top: 16px; color: var(--accent); font-weight: 600; }
.list { list-style: none; padding: 0; margin: 0; }
.list li { padding: 14px 0; border-bottom: 1px solid var(--line); }

/* 레벨 테스트 */
.progress { height: 4px; background: var(--paper-2); border-radius: 999px; overflow: hidden; margin: 24px 0 8px; }
.progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.q { font-size: 22px; font-weight: 700; line-height: 1.35; letter-spacing: -0.01em; margin: 20px 0 24px; }
.opts { display: grid; gap: 10px; }
.opt {
  text-align: left; width: 100%; min-height: 56px; padding: 14px 18px; border-radius: 14px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: 400 17px/1.4 var(--font); cursor: pointer;
}
.opt:hover, .opt:focus-visible { border-color: var(--accent); outline: none; }
.back { background: none; border: 0; color: var(--ink-2); font: 400 15px var(--font); padding: 16px 0; cursor: pointer; }
.level { font-size: 64px; font-weight: 800; letter-spacing: -0.03em; color: var(--accent); line-height: 1; margin: 32px 0 8px; }
.bars { display: grid; gap: 14px; margin: 24px 0 32px; }
.bar b { display: flex; justify-content: space-between; font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.bar b em { font-style: normal; color: var(--ink-2); font-weight: 400; }
.bar i { display: block; height: 8px; background: var(--paper-2); border-radius: 999px; overflow: hidden; }
.bar i span { display: block; height: 100%; background: var(--ink); border-radius: 999px; }
.tip { background: var(--paper-2); border-radius: 20px; padding: 20px 24px; margin: 0 0 24px; }
.tip p { margin: 6px 0 0; }
.toast { position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%); background: var(--ink); color: var(--paper); padding: 10px 18px; border-radius: 999px; font-size: 15px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.on { opacity: 1; }
[hidden] { display: none !important; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* 공유 버튼 — 브랜드 색은 공유 버튼에서만 예외로 쓴다 */
.share { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 0 0 10px; }
.share button {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 12px 0 10px;
  border: 0; border-radius: 14px; background: var(--paper-2); color: var(--ink); font: 500 13px/1.2 var(--font); cursor: pointer;
}
.share button:hover { filter: brightness(0.97); }
.share i { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; }
.share svg { width: 22px; height: 22px; }
.share .kakao i { background: #FEE500; color: #191919; }
.share .x i, .share .threads i { background: #000; color: #fff; }
.share .copy i { background: var(--line); color: var(--ink); }
@media (prefers-color-scheme: dark) { .share .x i, .share .threads i { background: #fff; color: #000; } }
.share-label { font-size: 15px; font-weight: 600; margin: 8px 0 10px; }

/* 아이패드·PC: 글자를 키우고 여백을 넓힌다. 읽는 폭은 그대로 좁게 둔다. */
@media (min-width: 768px) {
  body { font-size: 18px; }
  .wrap { max-width: 720px; padding: 0 32px; }
  .top { height: 72px; }
  h1 { font-size: 48px; margin-top: 72px; }
  h2 { font-size: 26px; margin-top: 56px; }
  .lead { font-size: 21px; }
  .card { padding: 32px; }
  .q { font-size: 26px; margin: 28px 0 32px; }
  .opt { font-size: 18px; min-height: 60px; padding: 16px 22px; }
  .level { font-size: 88px; margin-top: 56px; }
  .btn { max-width: 420px; }
  .share { max-width: 420px; }
}
@media (hover: hover) { .opt:hover { background: var(--paper-2); } }
.stat { display: inline-block; margin: 0 0 16px; padding: 6px 12px; border-radius: 999px; background: var(--paper-2); font-size: 15px; font-weight: 600; }

/* 내비게이션 */
.top { justify-content: space-between; }
.nav { display: flex; gap: 20px; }
.nav a { color: var(--ink-2); font-size: 15px; font-weight: 600; }
.nav a[aria-current] { color: var(--ink); }
.nav a:hover { color: var(--ink); text-decoration: none; }

/* 목록 */
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-top: 48px; }
.section-head h2 { margin: 0 0 4px; }
.section-head a { font-size: 15px; }
.posts li { padding: 0; }
.post-link { display: grid; gap: 4px; padding: 18px 0; color: var(--ink); }
.post-link:hover { text-decoration: none; }
.post-link:hover b { color: var(--accent); }
.post-link b { font-size: 19px; line-height: 1.35; letter-spacing: -0.01em; }

/* 글 본문 */
.prose h2 { margin-top: 40px; }
.prose p, .prose li { line-height: 1.75; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 4px 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.prose th { color: var(--ink-2); font-weight: 600; }
.prose blockquote { margin: 20px 0; padding: 4px 0 4px 16px; border-left: 3px solid var(--line); color: var(--ink-2); }
.prose code { background: var(--paper-2); padding: 2px 6px; border-radius: 6px; font-size: 0.92em; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.tags span { background: var(--paper-2); border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--ink-2); }
.card + .card { margin-top: 12px; }
@media (min-width: 768px) { .post-link b { font-size: 21px; } .nav { gap: 28px; } .nav a { font-size: 16px; } }