* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", -apple-system,
    BlinkMacSystemFont, sans-serif;
  color: #262b33;
  background: #ffffff;
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Header */

.site-header {
  border-bottom: 1px solid #eef0f4;
  position: sticky;
  top: 0;
  background: #ffffff;
  z-index: 10;
}

.hero,
.features,
.cta-banner {
  scroll-margin-top: 72px;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: #3b5bfd;
}

.nav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.nav a {
  color: #6b7280;
  transition: color 0.15s ease;
}

.nav a:hover {
  color: #3b5bfd;
}

/* Hero */

.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5rem) 1.5rem clamp(1.5rem, 5vw, 2.5rem);
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #171b22;
}

.hero-sub {
  margin-top: 1rem;
  font-size: clamp(0.95rem, 2.5vw, 1.05rem);
  color: #6b7280;
}

/* Features */

.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2rem) 1.5rem clamp(3rem, 8vw, 5rem);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 820px) {
  .features {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
}

.feature-card {
  background: #ffffff;
  border: 1px solid #f0f1f5;
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(20, 24, 40, 0.05);
}

.feature-visual {
  position: relative;
  border-radius: 16px;
  height: 160px;
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.visual-blue {
  background: linear-gradient(135deg, #4f6bff, #3b5bfd);
}

.visual-green {
  background: linear-gradient(135deg, #3fd6a3, #1fb787);
}

.visual-dark {
  background: linear-gradient(135deg, #363c4a, #1e222c);
}

.badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.9);
  color: #262b33;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.mock {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: #ffffff;
}

.mock-icon {
  font-size: 2rem;
}

.mock-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0.85;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: #171b22;
}

.feature-card .tag {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #3b5bfd;
  background: #eef1ff;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

.feature-card .desc {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: #6b7280;
}

/* CTA banner */

.cta-banner {
  background: linear-gradient(135deg, #3b5bfd, #2f47d6);
  color: #ffffff;
  text-align: center;
  padding: clamp(2.5rem, 8vw, 4rem) 1.5rem;
}

.cta-banner h2 {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 800;
}

.cta-banner h2 span {
  color: #9fe8ce;
}

.cta-banner p {
  margin-top: 0.6rem;
  font-size: 0.95rem;
  opacity: 0.85;
}

.store-buttons {
  margin-top: 1.75rem;
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
}

.store-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: #171b22;
  color: #ffffff;
  border-radius: 12px;
  padding: 0.6rem 1.2rem;
  cursor: not-allowed;
  opacity: 0.95;
}

.store-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.store-text {
  display: flex;
  flex-direction: column;
  text-align: left;
  line-height: 1.25;
}

.store-text small {
  font-size: 0.65rem;
  opacity: 0.75;
}

.store-text strong {
  font-size: 0.95rem;
  font-weight: 700;
}

/* Footer */

footer {
  padding: 2rem 1.5rem;
  text-align: center;
  background: #f8f9fb;
}

.footer-brand {
  font-weight: 700;
  font-size: 0.85rem;
  color: #4b5361;
  margin-bottom: 0.4rem;
}

footer p {
  font-size: 0.8rem;
  color: #8a919c;
  margin: 0.15rem 0;
}

.copyright {
  margin-top: 1rem;
  font-size: 0.72rem;
  line-height: 1.6;
  color: #b0b5bd;
}