:root {
  color-scheme: light;
  --background: #f7f5ff;
  --ink: #172238;
  --muted: #626a7a;
  --line: #ddd9ef;
  --surface: #ffffff;
  --indigo: #6556d9;
  --indigo-dark: #4336a7;
  --coral: #ff735c;
  --teal: #168f86;
  --gold: #f4b942;
}

* { box-sizing: border-box; }

html {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  background: var(--background);
  color: var(--ink);
}

body { margin: 0; min-height: 100vh; }

a {
  color: var(--indigo-dark);
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 2;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
}

.nav {
  max-width: 1040px;
  margin: 0 auto;
  padding: 15px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: white;
  background: linear-gradient(145deg, var(--indigo), var(--coral));
  font-size: 0.78rem;
  font-weight: 900;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
  font-size: 0.92rem;
  font-weight: 700;
}

.hero, .page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 64px 22px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: center;
  gap: 42px;
}

.eyebrow {
  display: inline-flex;
  color: var(--indigo-dark);
  font-size: 0.82rem;
  font-weight: 850;
  letter-spacing: 0.01em;
}

h1 {
  margin: 14px 0 18px;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
}

h2 {
  margin: 32px 0 12px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.02em;
}

p, li { color: var(--muted); line-height: 1.72; }

.lead { max-width: 670px; font-size: 1.1rem; }

.actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 46px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  font-weight: 800;
  text-decoration: none;
}

.button.primary { color: white; background: var(--ink); border-color: var(--ink); }
.button.secondary { color: var(--ink); background: var(--surface); }

.phone-panel {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--surface);
  box-shadow: 0 28px 80px rgba(67, 54, 167, 0.16);
}

.screen {
  min-height: 430px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 22px;
  color: white;
  background: linear-gradient(160deg, #272044, #172238 70%);
}

.screen p { color: rgba(255, 255, 255, 0.72); }

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
}

.metric {
  padding: 12px 9px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 13px;
}

.metric strong { display: block; font-size: 1.3rem; }
.metric span { color: rgba(255, 255, 255, 0.68); font-size: 0.75rem; }

.study-card {
  margin-top: 18px;
  padding: 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
}

.study-answer {
  margin-top: 10px;
  padding: 12px;
  border-radius: 12px;
  background: rgba(101, 86, 217, 0.9);
  font-weight: 750;
}

.feature-grid {
  margin-top: 38px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature, .notice, .doc-section {
  padding: 19px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}

.feature strong { display: block; margin-bottom: 8px; }
.doc-section { margin: 16px 0; }
.notice { border-left: 5px solid var(--gold); }
.notice.independent { border-left-color: var(--coral); }
.legal-meta { color: var(--muted); font-size: 0.94rem; }

.site-footer {
  padding: 28px 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

@media (max-width: 760px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .nav-links { justify-content: flex-start; }
  .hero, .page { padding-top: 42px; }
  .hero-grid, .feature-grid { grid-template-columns: 1fr; }
  .screen { min-height: 350px; }
}