:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --link: #0066cc;
  --line: rgba(0, 0, 0, 0.08);
  --nav: rgba(251, 251, 253, 0.8);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.47 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans", "Noto Sans KR", "Noto Sans", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  min-height: 48px;
  padding: 0 22px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  color: var(--ink);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand:hover { text-decoration: none; }

#nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-left: auto;
}

#nav a {
  color: var(--ink);
  font-size: 12px;
  text-decoration: none;
  opacity: 0.8;
}

#nav a[aria-current="page"] { opacity: 1; }
#nav a:hover { opacity: 1; text-decoration: none; }

.lang-pick select {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: 12px/1 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", sans-serif;
  padding: 8px 2px;
  cursor: pointer;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 22px 28px;
  text-align: center;
}

.kicker {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 17px;
  font-weight: 600;
}

h1 {
  margin: 0 auto 14px;
  max-width: 16em;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.lead {
  margin: 0 auto;
  max-width: 38em;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.4;
  font-weight: 400;
}

.cta { margin: 18px 0 0; font-size: 19px; }
.cta a::after { content: " ›"; }

.hero-pair {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 36px;
  margin-top: 56px;
}

.shot { margin: 0; width: min(280px, 42vw); }
.shot figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.phone {
  background: #1d1d1f;
  border-radius: 36px;
  padding: 10px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.16), 0 2px 6px rgba(0, 0, 0, 0.06);
}

.phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 28px;
  background: #fff;
}

.band {
  background: #fff;
  padding: 88px 22px;
  margin-top: 72px;
}

.modes {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px 22px;
}

.modes article { text-align: center; }
.modes .phone { border-radius: 28px; padding: 8px; }
.modes .phone img { border-radius: 22px; }
.modes h2 {
  margin: 18px 0 6px;
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.016em;
}
.modes p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.45; }

.pose {
  background: #000;
  color: #f5f5f7;
  padding: 96px 22px;
}

.pose-inner {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 280px;
  gap: 48px;
  align-items: center;
}

.pose h2 {
  margin: 0 0 12px;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.pose p { margin: 0; color: #a1a1a6; font-size: 19px; line-height: 1.4; max-width: 18em; }

.steps {
  max-width: 760px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 28px;
}

.steps li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: start;
}

.steps span {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.steps h2 { margin: 4px 0 4px; font-size: 24px; letter-spacing: -0.02em; }
.steps p { margin: 0; color: var(--muted); font-size: 17px; }

.fine {
  max-width: 40em;
  margin: 0 auto;
  padding: 36px 22px 12px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.prose {
  max-width: 680px;
  margin: 0 auto;
  padding: 56px 22px 24px;
}

.prose h1 {
  max-width: none;
  margin: 0 0 22px;
  font-size: 40px;
  text-align: left;
}

.prose .kicker { text-align: left; }
.prose p { margin: 0 0 16px; font-size: 17px; }

.site-foot {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 22px 48px;
  color: var(--muted);
  font-size: 12px;
}

.langs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 10px;
}

.langs a { color: var(--muted); font-size: 12px; text-decoration: none; }
.langs a[aria-current="true"] { color: var(--ink); }
.langs a:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .modes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pose-inner { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .pose p { max-width: 28em; }
}

@media (max-width: 640px) {
  .hero { padding-top: 48px; }
  .hero-pair { flex-direction: column; align-items: center; gap: 28px; }
  .shot { width: min(280px, 78vw); }
  .modes { grid-template-columns: 1fr; }
  .modes .phone { max-width: 320px; margin: 0 auto; }
  .nav-inner { flex-wrap: wrap; row-gap: 4px; padding-top: 8px; padding-bottom: 8px; }
  .brand { margin-right: auto; }
  .lang-pick { order: 2; }
  #nav { order: 3; width: 100%; margin-left: 0; }
}