:root {
  color-scheme: light;
  --ink: #071126;
  --muted: #526070;
  --line: #dbe6f7;
  --blue: #135df5;
  --green: #17a96b;
  --cyan: #35d7ff;
  --paper: #f5f9ff;
  --card: rgba(255, 255, 255, 0.78);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", "Noto Sans KR", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 60% 8%, rgba(53, 215, 255, .26), transparent 28%),
    radial-gradient(circle at 86% 42%, rgba(23, 169, 107, .16), transparent 30%),
    linear-gradient(180deg, #f9fcff 0%, #edf5ff 52%, #f7fbff 100%);
}

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px clamp(18px, 5vw, 60px);
  background: rgba(247, 251, 255, .82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219, 230, 247, .7);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
}
.brand img { width: 38px; height: 38px; border-radius: 10px; }
.nav nav { display: flex; gap: 18px; }
.nav nav a {
  color: #26364b;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
}

main { overflow: hidden; }
.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(320px, 0.84fr) minmax(420px, 1.16fr);
  gap: 34px;
  align-items: center;
  padding: 44px clamp(18px, 5vw, 60px) 70px;
}

.pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0 0 16px;
  padding: 8px 13px;
  border-radius: 999px;
  color: #0a48d1;
  background: rgba(19, 93, 245, .1);
  border: 1px solid rgba(19, 93, 245, .16);
  font-weight: 900;
}

h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 18px;
  font-size: clamp(42px, 6vw, 78px);
  line-height: 1.05;
  letter-spacing: 0;
}
h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.1;
}
h3 { margin-bottom: 10px; font-size: 21px; }
.lead {
  max-width: 620px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.65;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.language-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}
.language-switcher button {
  border: 1px solid rgba(19, 93, 245, .18);
  border-radius: 999px;
  padding: 9px 13px;
  color: #24405f;
  background: rgba(255, 255, 255, .72);
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(28, 64, 118, .08);
}
.language-switcher button.active {
  color: white;
  background: linear-gradient(90deg, #135df5, #17a96b);
}
.primary, .secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 14px;
  font-weight: 900;
  text-decoration: none;
}
.primary {
  color: white;
  background: linear-gradient(90deg, #135df5, #17a96b);
  box-shadow: 0 14px 34px rgba(19, 93, 245, .22);
}
.secondary {
  color: #0b3fb0;
  background: rgba(255, 255, 255, .72);
  border: 1px solid var(--line);
}

.hero-art {
  position: relative;
  border-radius: 30px;
  padding: 12px;
  background: rgba(255, 255, 255, .58);
  border: 1px solid rgba(219, 230, 247, .9);
  box-shadow: 0 30px 80px rgba(28, 64, 118, .16);
}
.hero-art::before {
  content: "";
  position: absolute;
  inset: -32px;
  z-index: -1;
  background: radial-gradient(circle, rgba(53, 215, 255, .34), transparent 62%);
}
.hero-art img {
  display: block;
  width: 100%;
  border-radius: 22px;
}

.section {
  padding: 78px clamp(18px, 5vw, 60px);
}
.section-head { max-width: 760px; margin-bottom: 30px; }
.section-head p:not(.pill), .pc p, li {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.feature-grid article, .pc-card, .download-card {
  background: var(--card);
  border: 1px solid rgba(203, 218, 240, .9);
  border-radius: 20px;
  box-shadow: 0 16px 42px rgba(28, 64, 118, .1);
}
.feature-grid article {
  padding: 22px;
}
.icon {
  display: inline-grid;
  place-items: center;
  min-width: 56px;
  height: 48px;
  margin-bottom: 16px;
  padding: 0 10px;
  border-radius: 16px;
  color: white;
  background: linear-gradient(135deg, var(--blue), var(--green));
  font-weight: 900;
  font-size: 14px;
}

.pc {
  display: grid;
  grid-template-columns: minmax(320px, .92fr) minmax(360px, 1.08fr);
  gap: 28px;
  align-items: center;
}
.pc ul {
  display: grid;
  gap: 8px;
  padding-left: 20px;
}
.pc-card {
  padding: 28px;
}
.window {
  border-radius: 18px;
  padding: 20px;
  background: linear-gradient(135deg, #071126, #14316b 50%, #0f7358);
  color: white;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12);
}
.dots { display: flex; gap: 7px; margin-bottom: 22px; }
.dots span { width: 10px; height: 10px; border-radius: 50%; background: #7dd3fc; }
.message {
  margin: 18px 0;
  padding: 16px;
  border-radius: 14px;
  background: rgba(255,255,255,.12);
  line-height: 1.6;
}
.window button {
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 13px 16px;
  color: white;
  background: linear-gradient(90deg, #4f7dff, #2bd6a0);
  font-weight: 900;
}

.download {
  text-align: center;
}
.download .section-head { margin-left: auto; margin-right: auto; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(240px, 360px));
  justify-content: center;
  gap: 16px;
}
.download-card {
  display: grid;
  gap: 8px;
  padding: 24px;
  text-decoration: none;
  color: var(--ink);
}
.muted-card {
  opacity: .78;
}
.download-card strong { font-size: 22px; }
.download-card span { color: var(--muted); }

footer {
  padding: 28px clamp(18px, 5vw, 60px);
  border-top: 1px solid rgba(219, 230, 247, .9);
  color: var(--muted);
  text-align: center;
}

@media (max-width: 920px) {
  .hero, .pc { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 36px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .nav { align-items: flex-start; flex-direction: column; }
  .nav nav { width: 100%; justify-content: space-between; gap: 8px; }
  h1 { font-size: 40px; }
  .lead { font-size: 17px; }
  .feature-grid, .download-grid { grid-template-columns: 1fr; }
  .section { padding-top: 58px; padding-bottom: 58px; }
}