:root {
  --bg: #0b1020;
  --text: #e9edf5;
  --muted: #a8b0c3;
  --gold: #d4af37;
  --gold-weak: #d4af3740;
  --navy: #0f1a3a;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans KR', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1000px 500px at 80% -10%, #1b244d 0%, var(--bg) 45%) no-repeat fixed;
}

.container {
  width: 100%;
  max-width: 1100px;
  padding: 0 20px;
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 16, 32, 0.7);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__logo { width: 28px; height: 28px; }
.brand__name { font-weight: 700; letter-spacing: 0.2px; }

.nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--text); text-decoration: none; font-weight: 600; opacity: 0.85; }
.nav a:hover { opacity: 1; }

.btn {
  border: 1px solid transparent;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  transition: all .2s ease;
}
.btn--primary { background: var(--gold); color: #1a1a1a; }
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 8px 20px #d4af3733; }
.btn--secondary { background: transparent; color: var(--text); border-color: var(--gold-weak); }
.btn--secondary:hover { border-color: var(--gold); }

.hero { padding: 72px 0; }
.hero__inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 36px; align-items: center; }
.hero__text h1 { margin: 0 0 16px; font-size: 40px; line-height: 1.15; }
.hero__text p { margin: 0 0 20px; color: var(--muted); font-size: 18px; }
.cta-group { display: flex; gap: 12px; margin: 20px 0 8px; }
.note { color: var(--muted); }
.hero__visual { display: flex; justify-content: center; }
.phone-mock { border-radius: 26px; padding: 18px; background: #0e1430; border: 1px solid rgba(255,255,255,0.06); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.04), 0 20px 80px rgba(0,0,0,0.35); }
.phone-mock img { display: block; width: 260px; height: auto; border-radius: 16px; }

.features { padding: 64px 0; background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
.features h2, .how h2, .faq h2 { margin: 0 0 24px; font-size: 28px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.06); border-radius: 14px; padding: 18px; }
.card h3 { margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); }

.how { padding: 64px 0; }
.how-steps { margin: 0; padding-left: 18px; color: var(--muted); }
.how-steps li { margin: 10px 0; }

.faq { padding: 64px 0; }
.faq details { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.06); border-radius: 12px; padding: 14px 16px; margin: 10px 0; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq p { color: var(--muted); }

.footer { border-top: 1px solid rgba(255,255,255,0.06); padding: 20px 0; }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--text); }

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .phone-mock img { width: 220px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .hero__text h1 { font-size: 32px; }
  .feature-grid { grid-template-columns: 1fr; }
}