:root {
  --teal: #00838F;
  --teal-light: #4DB6AC;
  --teal-dark: #005662;
  --amber: #FFC107;
  --ink: #14191A;
  --muted: #5F6B6D;
  --line: #E6EAEB;
  --bg: #FFFFFF;
  --soft: #F4F8F9;
  --card: #FFFFFF;
  --shadow: 0 2px 10px rgba(0,60,66,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --teal: #4DB6AC; --teal-light: #80CBC4; --teal-dark: #26A69A;
    --ink: #ECEFEF; --muted: #99A5A7; --line: #262C2D;
    --bg: #101314; --soft: #171B1C; --card: #171B1C;
    --shadow: 0 2px 10px rgba(0,0,0,.3);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
               "Pretendard", "Malgun Gothic", sans-serif;
  line-height: 1.75; word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* ── 히어로 ── */
.hero {
  background: linear-gradient(155deg, #00959F 0%, #00838F 45%, #004E58 100%);
  color: #fff; padding: 76px 24px 68px; text-align: center; position: relative;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: auto -10% -60% -10%; height: 200px;
  background: radial-gradient(60% 100% at 50% 0%, rgba(255,255,255,.14), transparent 70%);
}
.hero .icon {
  width: 84px; height: 84px; border-radius: 21px; display: block; margin: 0 auto 20px;
  box-shadow: 0 8px 24px rgba(0,0,0,.22);
}
.hero h1 { margin: 0 0 8px; font-size: 40px; letter-spacing: -1.2px; font-weight: 800; }
.hero .tagline { margin: 0; font-size: 17px; opacity: .94; }
.hero .sub { margin: 18px 0 0; font-size: 14px; opacity: .78; }

/* ── 레이아웃 ── */
main { max-width: 760px; margin: 0 auto; padding: 56px 24px 84px; }
.lead { font-size: 17px; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 48px 0 14px; letter-spacing: -.4px; }
p { margin: 12px 0; }

/* ── 기능 카드 ── */
.features { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; margin-top: 18px; }
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 18px 16px; box-shadow: var(--shadow);
}
.feature .t { font-weight: 700; font-size: 15px; margin-bottom: 4px; }
.feature .d { font-size: 14px; color: var(--muted); line-height: 1.6; }
.feature .em { color: var(--teal); font-weight: 700; }

/* ── 스크린샷 ── */
.shots {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 22px 0 6px;
}
@media (max-width: 560px) { .shots { grid-template-columns: repeat(3, 1fr); gap: 8px; } }
.shots img {
  width: 100%; height: auto; display: block; border-radius: 12px;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
.caption { text-align: center; font-size: 13px; color: var(--muted); margin-top: 10px; }

/* ── 안내 박스 ── */
.card {
  background: var(--soft); border-left: 3px solid var(--teal);
  padding: 16px 18px; border-radius: 8px; margin: 18px 0;
}

/* ── 문서 페이지 ── */
.doc h2 {
  font-size: 18px; margin: 38px 0 10px;
  padding-top: 20px; border-top: 1px solid var(--line);
}
.doc h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 26px; }
.page-title { font-size: 28px; margin: 0 0 4px; letter-spacing: -.6px; }
.date { color: var(--muted); font-size: 14px; margin-bottom: 30px; }
.back { display: inline-block; margin-bottom: 24px; font-size: 14px; }
ul { padding-left: 20px; margin: 12px 0; }
li { margin: 6px 0; }
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
th, td { text-align: left; padding: 11px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; letter-spacing: .02em; }

/* ── 푸터 ── */
.nav { margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 15px; }
.nav a { display: inline-block; margin: 0 20px 8px 0; }
footer { color: var(--muted); font-size: 13px; margin-top: 16px; line-height: 1.8; }

/* ── FAQ ── */
.faq-q { font-size: 16px; margin: 24px 0 4px; font-weight: 700; }