:root {
  --bg: #1d2221; --bg1: #252b2a; --bg2: #303634; --bg3: #424846; --line: #3c4341;
  --ink: #ffffff; --soft: #d5dbd8; --mute: #9ca7a3; --mint: #02dfc6; --mint2: #00c0ab; --on-mint: #00201b; --warn: #f2c14e;
  --font: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --r: 12px; --col: 760px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 90px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.75 var(--font); letter-spacing: -.01em; word-break: keep-all; overflow-wrap: anywhere; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--mint); text-underline-offset: 3px; }
a:hover { color: #fff; }
.sm-skip { position: absolute; left: -999px; top: 8px; background: var(--mint); color: var(--on-mint); padding: 8px 14px; border-radius: 999px; z-index: 99; }
.sm-skip:focus { left: 8px; }

/* header bar */
.sm-bar { position: sticky; top: 0; z-index: 30; background: var(--bg1); border-bottom: 1px solid var(--line); }
.sm-bar__in { max-width: 1240px; margin: 0 auto; display: flex; align-items: center; gap: 20px; padding: 12px 18px; }
.sm-bar__logo img, .sm-word { display: block; }
.sm-word { color: var(--mint); font-size: 22px; font-weight: 800; }
.sm-nav { flex: 1; }
.sm-nav__list { list-style: none; margin: 0; padding: 0; display: flex; gap: 2px; flex-wrap: wrap; }
.sm-nav__list a { display: block; padding: 8px 12px; border-radius: 10px; color: var(--soft); text-decoration: none; font-size: 15px; font-weight: 600; }
.sm-nav__list a:hover, .sm-nav__list .is-on a { background: var(--bg2); color: #fff; }
.sm-bar__acts { display: flex; gap: 8px; }
.sm-pill { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 20px; border-radius: 64px; font-weight: 700; font-size: 15px; text-decoration: none; white-space: nowrap; border: 1.5px solid transparent; }
.sm-pill--mint { background: var(--mint); color: var(--on-mint); }
.sm-pill--mint:hover { background: var(--mint2); color: var(--on-mint); }
.sm-pill--line { border-color: #fff; color: #fff; }
.sm-pill--line:hover { background: var(--bg2); color: #fff; }
.sm-pill--big { min-height: 52px; padding: 0 30px; font-size: 17px; }
.sm-burger { display: none; width: 42px; height: 42px; border: 0; border-radius: 10px; background: var(--bg2); position: relative; cursor: pointer; flex: none; }
.sm-burger span, .sm-burger span::before, .sm-burger span::after { position: absolute; left: 12px; width: 18px; height: 2px; background: #fff; content: ""; }
.sm-burger span { top: 20px; } .sm-burger span::before { top: -6px; left: 0; } .sm-burger span::after { top: 6px; left: 0; }

/* headings and byline */
.sm-head { max-width: 1240px; margin: 0 auto; padding: 36px 18px 4px; }
.sm-head__h { font-size: clamp(30px, 4.2vw, 44px); line-height: 1.25; margin: 0 0 12px; letter-spacing: -.02em; font-weight: 800; }
.sm-head__pic { margin-top: 20px; max-width: 980px; }
.sm-head__pic img { border-radius: var(--r); }
.sm-by { display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0 0 10px; font-size: 14px; color: var(--mute); }
.sm-by a { color: var(--soft); font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--mint); }

/* front: lead + slider, promo tiles */
.sm-hero { max-width: 1240px; margin: 0 auto; padding: 36px 18px 10px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 34px; align-items: center; }
.sm-hero__txt > p { font-size: 18px; color: var(--soft); }
.sm-slides { position: relative; }
.sm-slides__track { list-style: none; margin: 0; padding: 0; display: flex; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; border-radius: 16px; }
.sm-slides__track::-webkit-scrollbar { display: none; }
.sm-slides__item { flex: 0 0 100%; scroll-snap-align: start; }
.sm-slides__item img { width: 100%; border-radius: 16px; }
.sm-slides__dots { display: flex; justify-content: center; gap: 6px; margin-top: 12px; }
.sm-slides__dots button { width: 8px; height: 8px; border-radius: 99px; border: 0; padding: 0; background: var(--bg3); cursor: pointer; transition: width .2s; }
.sm-slides__dots button[aria-current] { width: 26px; background: var(--mint); }
.sm-tiles { list-style: none; max-width: 1240px; margin: 16px auto 0; padding: 0 18px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.sm-tile { display: grid; gap: 4px; height: 100%; padding: 18px 20px; border-radius: 16px; background: linear-gradient(140deg, var(--bg2), var(--bg1)); border: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.sm-tile:hover { border-color: var(--mint); color: var(--ink); }
.sm-tile__k { justify-self: start; font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 99px; background: rgba(2, 223, 198, .14); color: var(--mint); }
.sm-tile__t { font-size: 22px; line-height: 1.3; font-weight: 800; }
.sm-tile__s { font-size: 14px; color: var(--mute); }

/* article + section rail */
.sm-wrap { max-width: 1240px; margin: 0 auto; padding: 18px 18px 60px; display: grid; grid-template-columns: 250px minmax(0, var(--col)); gap: 44px; justify-content: center; }
.sm-wrap--solo { grid-template-columns: minmax(0, var(--col)); }
.sm-rail__box { position: sticky; top: 88px; background: var(--bg1); border: 1px solid var(--line); border-radius: var(--r); padding: 6px; }
.sm-rail__box summary { list-style: none; cursor: pointer; font-size: 13px; font-weight: 700; color: var(--mute); padding: 8px 10px; }
.sm-rail__box summary::-webkit-details-marker { display: none; }
.sm-rail__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; counter-reset: r; }
.sm-rail__list a { display: flex; gap: 10px; padding: 8px 10px; border-radius: 9px; color: var(--soft); text-decoration: none; font-size: 14.5px; line-height: 1.45; counter-increment: r; }
.sm-rail__list a::before { content: counter(r); flex: none; width: 22px; height: 22px; border-radius: 7px; background: var(--bg2); display: grid; place-items: center; font-size: 12px; font-weight: 700; color: var(--mute); }
.sm-rail__list a:hover { background: var(--bg2); color: #fff; }
.sm-rail__list a[aria-current] { background: var(--bg2); color: #fff; }
.sm-rail__list a[aria-current]::before { background: var(--mint); color: var(--on-mint); }
.sm-text { min-width: 0; }
.sm-text h2 { font-size: clamp(24px, 2.9vw, 30px); line-height: 1.35; margin: 48px 0 14px; font-weight: 800; letter-spacing: -.02em; }
.sm-text h2::before { content: ""; display: block; width: 36px; height: 4px; border-radius: 4px; background: var(--mint); margin-bottom: 14px; }
.sm-text h3 { font-size: 21px; line-height: 1.4; margin: 32px 0 10px; }
.sm-text h4 { font-size: 18px; margin: 24px 0 8px; }
.sm-text p, .sm-text li { color: var(--soft); }
.sm-text strong, .sm-text b { color: #fff; }
.sm-text ul, .sm-text ol { padding-left: 22px; }
.sm-text li { margin: 6px 0; }
.sm-text li::marker { color: var(--mint); }

/* tables */
.sm-grid { margin: 24px 0; }
.sm-grid__x { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--bg1); }
.sm-grid table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.sm-grid th { background: var(--bg2); text-align: left; padding: 12px 14px; font-size: 14px; color: #fff; }
.sm-grid td { padding: 12px 14px; border-top: 1px solid var(--line); vertical-align: top; color: var(--soft); }

/* components */
.sm-tip { margin: 24px 0; padding: 16px 18px; border-radius: var(--r); background: rgba(2, 223, 198, .07); border: 1px solid rgba(2, 223, 198, .35); }
.sm-tip p { margin: 0; }
.sm-tip__k { font-weight: 800; color: var(--mint); }
.sm-spec { margin: 24px 0; border-radius: var(--r); background: var(--bg1); border: 1px solid var(--line); overflow: hidden; }
.sm-spec table { width: 100%; border-collapse: collapse; }
.sm-spec th, .sm-spec td { padding: 11px 16px; text-align: left; border-top: 1px solid var(--line); font-size: 15.5px; }
.sm-spec thead th { border-top: 0; background: var(--bg2); font-size: 13px; color: var(--mute); }
.sm-spec td:first-child { color: var(--mute); width: 42%; }
.sm-spec td:last-child { color: #fff; font-weight: 600; }
.sm-spec dl { margin: 0; display: grid; grid-template-columns: minmax(0, 42%) 1fr; }
.sm-spec dt, .sm-spec dd { margin: 0; padding: 11px 16px; border-top: 1px solid var(--line); }
.sm-spec dt { color: var(--mute); } .sm-spec dd { color: #fff; font-weight: 600; }
.sm-steps { margin: 24px 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 8px; }
.sm-steps > li, .sm-steps li { position: relative; margin: 0; padding: 12px 14px 12px 56px; background: var(--bg1); border: 1px solid var(--line); border-radius: var(--r); counter-increment: s; color: var(--soft); }
.sm-steps > li::before, .sm-steps li::before { content: counter(s); position: absolute; left: 12px; top: 10px; width: 30px; height: 30px; border-radius: 99px; background: var(--mint); color: var(--on-mint); display: grid; place-items: center; font-weight: 800; font-size: 14px; }
.sm-vs { margin: 26px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sm-vs__col { padding: 16px 18px; border-radius: var(--r); background: var(--bg1); border: 1px solid var(--line); }
.sm-vs__said { border-top: 4px solid var(--bg3); } .sm-vs__real { border-top: 4px solid var(--mint); }
.sm-vs__k { display: block; font-size: 12.5px; font-weight: 700; color: var(--mute); margin-bottom: 6px; }
.sm-vs p { margin: 0; }
.sm-shot, .sm-pic { margin: 28px 0; }
.sm-shot img, .sm-pic img { border-radius: var(--r); }
.sm-pic__cap, .sm-shot figcaption { font-size: 14px; color: var(--mute); margin-top: 8px; }
.sm-go { margin: 36px 0; display: flex; justify-content: center; }

/* FAQ */
.sm-faq { margin-top: 44px; }
.sm-faq__q { border: 1px solid var(--line); border-radius: var(--r); background: var(--bg1); margin: 10px 0; }
.sm-faq__q summary { cursor: pointer; padding: 14px 48px 14px 16px; font-weight: 700; list-style: none; position: relative; }
.sm-faq__q summary::-webkit-details-marker { display: none; }
.sm-faq__q summary::after { content: ""; position: absolute; right: 18px; top: 22px; width: 10px; height: 10px; border-right: 2px solid var(--mint); border-bottom: 2px solid var(--mint); transform: rotate(45deg); transition: transform .2s; }
.sm-faq__q[open] summary::after { transform: rotate(-135deg); top: 26px; }
.sm-faq__a { padding: 0 16px 6px; color: var(--soft); }

/* footer */
.sm-foot { background: var(--bg1); border-top: 1px solid var(--line); margin-top: 30px; }
.sm-foot__in { max-width: 1240px; margin: 0 auto; padding: 36px 18px 18px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 30px; }
.sm-foot__brand p { margin: 10px 0 0; font-size: 13.5px; color: var(--mute); }
.sm-foot__nav { display: grid; gap: 14px; align-content: start; }
.sm-foot__list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.sm-foot__list a { color: var(--soft); text-decoration: none; font-size: 15px; }
.sm-foot__list--fine a { color: var(--mute); font-size: 14px; }
.sm-foot__age { max-width: 1240px; margin: 0 auto; padding: 14px 18px 28px; font-size: 13px; color: var(--mute); border-top: 1px solid var(--line); }
.sm-foot__age b { display: inline-block; color: var(--on-mint); background: var(--mint); border-radius: 6px; padding: 0 6px; margin-right: 8px; }
.sm-lost { padding-bottom: 90px; }

@media (max-width: 1099px) {
  .sm-wrap { grid-template-columns: minmax(0, var(--col)); gap: 0; }
  .sm-rail__box { position: static; margin-bottom: 8px; }
  .sm-burger { display: block; }
  .sm-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--bg1); border-bottom: 1px solid var(--line); padding: 8px 12px 14px; }
  .sm-open .sm-nav { display: block; }
  .sm-nav__list { flex-direction: column; }
  .sm-bar__in { position: relative; gap: 12px; }
  .sm-bar__acts { margin-left: auto; }
  .sm-hero { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .sm-bar__in { padding: 10px 14px; }
  .sm-bar__logo img { width: 112px; height: auto; }
  .sm-bar__acts .sm-pill { min-height: 36px; padding: 0 12px; font-size: 13.5px; }
  .sm-hero { padding-top: 24px; }
  .sm-slides__item img { aspect-ratio: auto; }
  .sm-tiles { grid-template-columns: 1fr; }
  .sm-vs, .sm-foot__in { grid-template-columns: 1fr; }
  .sm-grid--stack table, .sm-grid--stack tbody, .sm-grid--stack tr, .sm-grid--stack td { display: block; width: 100%; }
  .sm-grid--stack thead { display: none; }
  .sm-grid--stack tr { border-top: 1px solid var(--line); padding: 6px 0; }
  .sm-grid--stack td { border: 0; padding: 4px 14px; }
  .sm-grid--stack td::before { content: attr(data-k); display: block; font-size: 12px; color: var(--mute); }
  .sm-pill--big { width: 100%; }
}