:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --text: #1c2321;
  --muted: #5b6663;
  --line: #e4e7e5;
  --brand: #0f766e;
  --brand-ink: #ffffff;
  --brand-soft: #e6f3f1;
  --radius: 14px;
  --wrap: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121615;
    --surface: #1a201f;
    --text: #e8edeb;
    --muted: #a3aeab;
    --line: #2b3432;
    --brand: #2dd4bf;
    --brand-ink: #062522;
    --brand-soft: #173330;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

a { color: inherit; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

.skip {
  position: absolute; left: -9999px; top: 8px;
  background: var(--brand); color: var(--brand-ink); padding: 8px 12px; border-radius: 8px;
}
.skip:focus { left: 8px; z-index: 10; }

:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }

/* header */
.top {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.top-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-size: 19px; color: var(--brand); }
.brand span { color: var(--text); }
.top nav { display: flex; gap: 4px; }
.top nav a { text-decoration: none; color: var(--muted); font-size: 15px; padding: 8px 10px; border-radius: 8px; }
.top nav a:hover { color: var(--text); background: var(--brand-soft); }

/* hero */
.hero { padding: 88px 0 72px; }
.eyebrow {
  display: inline-block; margin: 0 0 18px;
  font-size: 14px; font-weight: 600; color: var(--brand);
  background: var(--brand-soft); padding: 6px 12px; border-radius: 999px;
}
.hero h1 {
  margin: 0; font-size: clamp(32px, 5.4vw, 54px); line-height: 1.22; letter-spacing: -0.03em; font-weight: 800;
}
.lead { margin: 22px 0 0; max-width: 640px; font-size: clamp(17px, 2vw, 19px); color: var(--muted); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 22px; border-radius: 12px;
  font-weight: 700; font-size: 16px; text-decoration: none; transition: transform .12s ease, background .12s ease;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--brand); color: var(--brand-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { border: 1px solid var(--line); background: var(--surface); }
.btn.ghost:hover { border-color: var(--brand); }

/* sections */
section h2 { font-size: clamp(24px, 3.2vw, 32px); letter-spacing: -0.02em; line-height: 1.3; margin: 0 0 10px; }
.section-lead { margin: 0 0 32px; color: var(--muted); }

.tools { padding: 56px 0 72px; }
.grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.card {
  position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px 22px;
}
.card h3 { margin: 16px 0 6px; font-size: 19px; letter-spacing: -0.01em; }
.card p { margin: 0 0 16px; color: var(--muted); font-size: 15.5px; }
.icon { width: 44px; height: 44px; border-radius: 12px; background: var(--brand-soft); display: grid; place-items: center; }
.icon svg { width: 24px; height: 24px; fill: none; stroke: var(--brand); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.status { display: inline-block; font-size: 13px; font-weight: 600; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; }

.privacy { padding: 72px 0; background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.two-col { display: grid; gap: 40px; grid-template-columns: 1.1fr 1fr; align-items: start; }
.privacy p { color: var(--muted); margin: 0; }
.privacy strong { color: var(--text); }
.points { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.points li { display: grid; gap: 2px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.points span { color: var(--muted); font-size: 15.5px; }

.faq { padding: 72px 0 88px; }
.faq h2 { margin-bottom: 20px; }
details { border-bottom: 1px solid var(--line); padding: 4px 0; }
summary { cursor: pointer; list-style: none; padding: 16px 32px 16px 0; font-weight: 700; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 13px; font-size: 22px; font-weight: 400; color: var(--muted); }
details[open] summary::after { content: "−"; }
details p { margin: 0 0 18px; color: var(--muted); }

.foot { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
.foot p { margin: 0; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 56px 0 48px; }
  .hero h1 br { display: none; }
  .top nav a:not(:first-child) { display: none; }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
  .tools, .privacy, .faq { padding-top: 48px; padding-bottom: 56px; }
  .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}