:root {
  --ink: #0B1424; --ink-2: #4E5968; --ink-3: #8B95A1;
  --primary: #3182F6; --primary-strong: #1B64DA; --primary-050: #EEF4FE;
  --bg: #FBFCFE; --card: #FFFFFF; --line: #EAEDF1;
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.7; letter-spacing: -0.2px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 22px; }

.topbar { display: flex; align-items: center; gap: 8px; padding: 18px 0; }
.topbar a { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); }
.mark { width: 24px; height: 24px; color: var(--primary); }
.wordmark { font-size: 17px; font-weight: 800; letter-spacing: -0.5px; }

.crumb { font-size: 13px; color: var(--ink-3); padding: 6px 0 0; }
.crumb a { color: var(--ink-3); text-decoration: none; }
.crumb a:hover { color: var(--primary); }

article { padding: 20px 0 8px; }
article h1 { font-size: 27px; font-weight: 800; line-height: 1.35; letter-spacing: -0.7px; margin-bottom: 12px; }
article .meta { font-size: 13px; color: var(--ink-3); margin-bottom: 26px; }
article h2 { font-size: 19px; font-weight: 800; letter-spacing: -0.4px; margin: 34px 0 12px; padding-top: 6px; }
article h3 { font-size: 16px; font-weight: 700; margin: 22px 0 8px; }
article p { font-size: 16px; color: var(--ink); margin-bottom: 14px; }
article ul, article ol { margin: 0 0 16px 20px; }
article li { font-size: 16px; margin-bottom: 8px; }
article strong { font-weight: 700; }
article a { color: var(--primary-strong); text-decoration: none; border-bottom: 1px solid rgba(27,100,218,.25); }
article a:hover { border-bottom-color: var(--primary-strong); }

.lead { font-size: 17px; color: var(--ink-2); background: var(--primary-050); border-radius: 14px; padding: 16px 18px; margin-bottom: 26px; }

.callout { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin: 18px 0; }
.callout .t { font-weight: 700; font-size: 15px; margin-bottom: 6px; display: flex; align-items: center; gap: 6px; }
.callout p { font-size: 14.5px; color: var(--ink-2); margin: 0; }

.applink {
  display: flex; gap: 14px; align-items: center;
  background: var(--ink); color: #fff; border-radius: 18px; padding: 20px; margin: 30px 0; text-decoration: none; border: none;
}
.applink .ico { width: 44px; height: 44px; border-radius: 12px; background: rgba(255,255,255,.12); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.applink .ico svg { width: 24px; height: 24px; color: #fff; }
.applink .tx b { display: block; font-size: 15.5px; font-weight: 700; margin-bottom: 2px; }
.applink .tx span { font-size: 13.5px; color: #AEB7C2; }

.related { border-top: 1px solid var(--line); margin-top: 34px; padding-top: 22px; }
.related h2 { font-size: 15px; font-weight: 700; margin: 0 0 12px; }
.related a { display: block; font-size: 15px; color: var(--ink); text-decoration: none; padding: 11px 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 8px; border-bottom: 1px solid var(--line); }
.related a:hover { border-color: var(--primary); color: var(--primary-strong); }

.disc { font-size: 12.5px; color: var(--ink-3); line-height: 1.6; border-top: 1px solid var(--line); margin-top: 28px; padding: 18px 0 8px; }

.updated { font-size: 12.5px; color: var(--ink-3); margin: 4px 0 0; }

/* FAQ 아코디언 스타일(details/summary) */
.faq { margin: 16px 0 0; }
.faq details { border: 1px solid var(--line); border-radius: 12px; padding: 0 16px; margin-bottom: 8px; background: var(--card); }
.faq summary { list-style: none; cursor: pointer; padding: 15px 0; font-size: 15.5px; font-weight: 700; color: var(--ink); display: flex; justify-content: space-between; gap: 10px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-3); font-weight: 400; font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq .a { padding: 12px 0 15px; font-size: 15px; color: var(--ink-2); line-height: 1.65; }

/* 하단 고정 다운로드 바 (아티클 페이지) */
body.art { padding-bottom: 82px; }
.dlbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
  background: rgba(255,255,255,.92); backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.dlbar .tx { flex: 1; min-width: 0; }
.dlbar .tx b { display: block; font-size: 14px; font-weight: 700; color: var(--ink); }
.dlbar .tx span { display: block; font-size: 12px; color: var(--ink-3); }
.dlbar a { flex-shrink: 0; background: var(--primary); color: #fff; font-weight: 700; font-size: 14px; padding: 11px 18px; border-radius: 12px; text-decoration: none; }
.dlbar a:active { transform: translateY(1px); }

footer { border-top: 1px solid var(--line); padding: 24px 0 44px; text-align: center; color: var(--ink-3); font-size: 12.5px; margin-top: 20px; }
footer a { color: var(--ink-2); text-decoration: none; }

:focus-visible { outline: 3px solid rgba(49,130,246,.4); outline-offset: 2px; border-radius: 6px; }