:root {
  color-scheme: light;
  --ink: #172032;
  --muted: #5c667a;
  --line: #d9e1ec;
  --surface: #ffffff;
  --soft: #f4f7fb;
  --brand: #0b63d0;
  --brand-strong: #084ea3;
  --teal: #12846f;
  --coral: #df6b47;
  --gold: #9d7a1d;
  --shadow: 0 22px 54px rgba(23, 32, 50, 0.14);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #fbfcfe;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}

img {
  display: block;
  max-width: 100%;
}

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 68px;
  padding: 12px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid rgba(217, 225, 236, 0.85);
  background: rgba(251, 252, 254, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  font-size: 18px;
  font-weight: 800;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.site-nav a {
  padding: 8px 10px;
  border-radius: 6px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: #e9f1fb;
  color: var(--brand-strong);
  outline: none;
}

.hero,
.problem-solution,
.features,
.use-cases,
.trust,
.faq-cta {
  padding: clamp(58px, 8vw, 96px) clamp(18px, 5vw, 72px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(300px, 0.94fr);
  align-items: center;
  gap: clamp(30px, 6vw, 80px);
  min-height: calc(100vh - 68px);
  padding-top: clamp(42px, 6vw, 74px);
  padding-bottom: clamp(42px, 5vw, 68px);
  background:
    linear-gradient(135deg, rgba(11, 99, 208, 0.08), rgba(18, 132, 111, 0.08) 52%, rgba(223, 107, 71, 0.07)),
    #f7fafd;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 20px;
  font-size: clamp(38px, 6vw, 70px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 19px;
  line-height: 1.28;
}

.hero-text {
  max-width: 650px;
  margin-bottom: 28px;
  color: #3e4a5f;
  font-size: clamp(17px, 2.1vw, 21px);
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.primary-cta,
.secondary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-cta {
  gap: 12px;
  max-width: 100%;
  padding: 10px 14px 10px 18px;
  background: var(--brand);
  color: #fff;
  box-shadow: 0 14px 28px rgba(11, 99, 208, 0.24);
}

.primary-cta:hover,
.primary-cta:focus-visible {
  background: var(--brand-strong);
  outline: none;
}

.primary-cta img {
  width: 124px;
  height: auto;
  border-radius: 5px;
}

.primary-cta.compact {
  margin-top: 10px;
}

.secondary-cta {
  padding: 0 18px;
  border: 1px solid #b8c6d9;
  background: #fff;
  color: var(--brand-strong);
}

.secondary-cta:hover,
.secondary-cta:focus-visible {
  border-color: var(--brand);
  outline: none;
}

.signal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.signal-list li {
  padding: 7px 10px;
  border: 1px solid #cdd9e8;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.74);
  color: #35445b;
  font-size: 14px;
  font-weight: 700;
}

.app-preview {
  display: flex;
  justify-content: center;
}

.phone-frame {
  width: min(100%, 360px);
  min-height: 610px;
  padding: 18px;
  border: 1px solid #c9d5e4;
  border-radius: 32px;
  background: #0f172a;
  box-shadow: var(--shadow);
}

.phone-status {
  width: 86px;
  height: 7px;
  margin: 0 auto 18px;
  border-radius: 999px;
  background: #30415d;
}

.preview-card,
.preview-row,
.chat-chip {
  border-radius: 8px;
  background: #fff;
}

.preview-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
}

.preview-card img {
  width: 46px;
  height: 46px;
  border-radius: 10px;
}

.preview-card strong,
.preview-card span {
  display: block;
}

.preview-card span {
  color: var(--muted);
  font-size: 13px;
}

.qr-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 190px;
  height: 190px;
  margin: 28px auto;
  padding: 16px;
  border: 10px solid #fff;
  border-radius: 18px;
  background: #fff;
}

.qr-panel span {
  border-radius: 4px;
  background: #121826;
}

.qr-panel span:nth-child(2),
.qr-panel span:nth-child(4),
.qr-panel span:nth-child(8) {
  background: #d9e1ec;
}

.preview-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  padding: 14px 16px;
}

.preview-row span {
  color: var(--muted);
  font-weight: 700;
}

.preview-row strong {
  color: var(--brand);
  font-size: 24px;
}

.preview-row.accent strong {
  color: var(--teal);
}

.chat-chip {
  margin-top: 18px;
  padding: 12px;
  color: var(--ink);
  text-align: center;
  font-size: 14px;
  font-weight: 800;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.statement-grid,
.feature-grid,
.case-list,
.faq-grid {
  display: grid;
  gap: 16px;
}

.statement-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.case-list,
.faq-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.statement-grid article,
.feature-grid article,
.case-list article,
details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(23, 32, 50, 0.06);
}

.statement-grid article,
.feature-grid article,
.case-list article {
  padding: 22px;
}

.statement-grid p,
.feature-grid p,
.case-list p,
details p {
  margin-bottom: 0;
  color: var(--muted);
}

.problem-solution,
.use-cases {
  background: #fff;
}

.features {
  background: var(--soft);
}

.feature-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 32px;
  margin-bottom: 16px;
  padding: 0 10px;
  border-radius: 999px;
  background: #e8f2ff;
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 900;
}

.feature-grid article:nth-child(2) .feature-mark {
  background: #e8f7f3;
  color: var(--teal);
}

.feature-grid article:nth-child(3) .feature-mark {
  background: #fff4df;
  color: var(--gold);
}

.feature-grid article:nth-child(4) .feature-mark {
  background: #fff0ea;
  color: var(--coral);
}

.trust {
  background: #172032;
  color: #fff;
}

.trust .eyebrow {
  color: #7ee1c8;
}

.trust-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
  gap: clamp(26px, 5vw, 64px);
  align-items: start;
}

.trust-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.trust-list li {
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: #e9eef7;
}

.faq-cta {
  background: #fff;
}

details {
  padding: 18px;
}

summary {
  cursor: pointer;
  color: var(--ink);
  font-size: 17px;
  font-weight: 800;
}

summary:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 4px;
}

details p {
  margin-top: 12px;
}

.final-cta {
  margin-top: 26px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid #cdd9e8;
  border-radius: 8px;
  background: #f7fafd;
}

.final-cta h2 {
  font-size: clamp(24px, 3vw, 34px);
}

.final-cta p {
  margin: 10px 0 4px;
  color: var(--muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px clamp(18px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: #f4f7fb;
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  font-weight: 800;
}

.site-footer-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.policy-link {
  color: var(--brand-strong);
}

.policy-link:hover,
.policy-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 2px;
  outline: none;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .app-preview {
    justify-content: flex-start;
  }

  .statement-grid,
  .feature-grid,
  .case-list,
  .faq-grid,
  .trust-panel {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    min-height: 0;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero,
  .problem-solution,
  .features,
  .use-cases,
  .trust,
  .faq-cta {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: 36px;
  }

  .hero-actions,
  .primary-cta,
  .secondary-cta {
    width: 100%;
  }

  .primary-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .primary-cta img {
    width: 142px;
  }

  .statement-grid,
  .feature-grid,
  .case-list,
  .faq-grid,
  .trust-panel {
    grid-template-columns: 1fr;
  }

  .phone-frame {
    min-height: 560px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer-links {
    flex-wrap: wrap;
    gap: 10px 18px;
  }
}

@media (max-width: 380px) {
  .site-nav a {
    padding-left: 6px;
    padding-right: 6px;
    font-size: 13px;
  }

  h1 {
    font-size: 33px;
  }

  h2 {
    font-size: 26px;
  }

  .phone-frame {
    padding: 14px;
  }

  .qr-panel {
    width: 168px;
    height: 168px;
  }
}