:root {
  color-scheme: light;
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  color: #172033;
  background: #f4f5f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  line-height: 1.7;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 80px;
}

header {
  border-bottom: 1px solid #dce1e8;
  padding-bottom: 24px;
  margin-bottom: 32px;
}

h1 {
  margin: 8px 0;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.25;
}

h2 {
  margin: 36px 0 8px;
  font-size: 20px;
}

p,
li {
  font-size: 16px;
}

ul {
  padding-left: 22px;
}

a {
  color: #075fc8;
}

.brand {
  color: #075fc8;
  font-weight: 700;
}

.meta {
  color: #5f6978;
}

.contact {
  background: #ffffff;
  border: 1px solid #dce1e8;
  border-radius: 8px;
  padding: 18px 20px;
  margin-top: 32px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.landing {
  background: #f4f5f7;
}

.landing main {
  width: 100%;
  margin: 0;
  padding: 0;
}

.site-nav {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 50%;
  display: flex;
  width: min(1120px, calc(100% - 40px));
  height: 76px;
  align-items: center;
  justify-content: space-between;
  transform: translateX(-50%);
}

.site-brand {
  color: #172033;
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.site-nav-links {
  display: flex;
  gap: 24px;
}

.site-nav-links a {
  color: #465063;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.hero {
  display: flex;
  min-height: min(760px, 88svh);
  align-items: center;
  background-color: #eef1f8;
  background-image: url("lesson-ledger-app.png");
  background-position: calc(100% - 8vw) center;
  background-repeat: no-repeat;
  background-size: min(42vw, 520px);
}

.hero-copy {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding-right: min(48vw, 580px);
}

.hero-kicker,
.section-label {
  margin: 0 0 12px;
  color: #075fc8;
  font-size: 14px;
  font-weight: 800;
}

.landing .hero h1 {
  margin: 0;
  color: #111827;
  font-size: clamp(48px, 7vw, 84px);
  line-height: 1.05;
}

.hero-description {
  max-width: 560px;
  margin: 24px 0 26px;
  color: #465063;
  font-size: 19px;
}

.release-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #394457;
  font-size: 14px;
  font-weight: 700;
}

.status-mark {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #2f9e68;
}

.primary-action {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  border-radius: 6px;
  padding: 0 22px;
  background: #172033;
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.store-action {
  gap: 10px;
  background: #111827;
}

.toss-action {
  gap: 10px;
  background: #0064ff;
}

.play-mark {
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 13px solid #ffffff;
}

.toss-mark {
  display: inline-grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 50%;
  background: #ffffff;
  color: #0064ff;
  font-size: 13px;
  font-weight: 900;
  line-height: 1;
}

.secondary-action {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  border: 1px solid #cdd5e2;
  border-radius: 6px;
  padding: 0 18px;
  background: rgba(255, 255, 255, 0.64);
  color: #172033;
  font-weight: 700;
  text-decoration: none;
}

.feature-section {
  background: #ffffff;
  padding: 88px 0 96px;
}

.section-inner,
.footer-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.landing h2 {
  margin: 0;
  color: #172033;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.3;
}

.feature-grid {
  display: grid;
  margin-top: 58px;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.feature-grid article {
  border-top: 3px solid #172033;
  padding-top: 18px;
}

.feature-grid article:nth-child(2) {
  border-color: #075fc8;
}

.feature-grid article:nth-child(3) {
  border-color: #2f9e68;
}

.feature-grid span {
  color: #738095;
  font-size: 13px;
  font-weight: 800;
}

.feature-grid h3 {
  margin: 20px 0 8px;
  font-size: 21px;
}

.feature-grid p,
.free-layout > p {
  margin: 0;
  color: #5f6978;
}

.free-section {
  background: #e9f5ef;
  padding: 76px 0;
}

.free-layout {
  display: grid;
  align-items: end;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
}

.free-layout > p {
  max-width: 500px;
  font-size: 18px;
}

.landing footer {
  background: #172033;
  color: #ffffff;
  padding: 44px 0;
}

.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.footer-inner p {
  margin: 8px 0 0;
  color: #b9c2d0;
  font-size: 14px;
}

.footer-inner nav {
  margin: 0;
}

.footer-inner a {
  color: #dbe3ee;
  font-size: 14px;
  text-decoration: none;
}

@media (max-width: 720px) {
  .site-nav {
    height: 64px;
  }

  .site-nav-links a:first-child {
    display: none;
  }

  .hero {
    min-height: 88svh;
    align-items: flex-end;
    background-position: center 72px;
    background-size: 230px;
  }

  .hero-copy {
    padding: 330px 0 52px;
  }

  .landing .hero h1 {
    font-size: 46px;
  }

  .hero-description {
    margin: 18px 0 22px;
    font-size: 17px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-action,
  .secondary-action {
    justify-content: center;
    width: 100%;
  }

  .feature-section {
    padding: 68px 0 72px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .free-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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