:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --on-accent: #ffffff;
  --border: #d2d2d7;
  --nav-bg: rgb(255 255 255 / 0.72);
  --dark-bg: #000000;
  --dark-text: #f5f5f7;
  --dark-muted: #a1a1a6;
  --badge-bg: #e8f5ec;
  --badge-text: #1f7a3a;
  --shadow: 0 30px 60px -20px rgb(0 0 0 / 0.25);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #161617;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #2997ff;
    --accent-hover: #47a6ff;
    --on-accent: #ffffff;
    --border: #424245;
    --nav-bg: rgb(22 22 23 / 0.72);
    --dark-bg: #161617;
    --badge-bg: #10331c;
    --badge-text: #6fdc8c;
    --shadow: 0 30px 60px -20px rgb(0 0 0 / 0.8);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Apple SD Gothic Neo", "Hiragino Sans", "PingFang SC", "PingFang TC", "Noto Sans KR", "Segoe UI", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; }

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

/* Global nav */

.globalnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
}
.globalnav-inner {
  max-width: 1024px;
  height: 52px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand:hover { text-decoration: none; }
.brand img { border-radius: 6px; flex: none; }
.globalnav-actions { display: flex; align-items: center; gap: 12px; flex: none; }

.langmenu { position: relative; }
.langmenu summary {
  list-style: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 8px;
}
.langmenu summary::-webkit-details-marker { display: none; }
.langmenu summary::after { content: " ▾"; font-size: 11px; }
.langmenu nav {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 8px);
  min-width: 160px;
  padding: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgb(0 0 0 / 0.12);
  display: flex;
  flex-direction: column;
}
.langmenu nav a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
}
.langmenu nav a:hover { background: var(--bg-alt); text-decoration: none; }
.langmenu nav a[aria-current] { font-weight: 600; color: var(--accent); }

/* Buttons and badges */

.button {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 980px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 17px;
  font-weight: 500;
  white-space: nowrap;
}
.button:hover { background: var(--accent-hover); text-decoration: none; }
.button.small { padding: 5px 14px; font-size: 13px; }

.badge {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 980px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 15px;
  font-weight: 600;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* Phone screenshots */

.phone {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: 40px;
  border: 8px solid #1d1d1f;
  background: #1d1d1f;
  box-shadow: var(--shadow);
}

/* Hero */

.hero {
  padding: 72px 16px 0;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}
.app-icon {
  border-radius: 24%;
  box-shadow: 0 12px 30px rgb(0 0 0 / 0.18);
  margin-bottom: 20px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(44px, 9vw, 88px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  font-weight: 700;
}
.tagline {
  margin: 12px 0 0;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.15;
  font-weight: 600;
  background: linear-gradient(90deg, #2f7cf6, #4cb963);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  max-width: 640px;
  margin: 20px auto 32px;
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--muted);
}
.hero-phone {
  max-width: 340px;
  margin: 56px auto 0;
  border-bottom: 0;
  border-radius: 40px 40px 0 0;
  max-height: 520px;
  object-fit: cover;
  object-position: top;
}

/* Stats */

.stats {
  position: relative;
  max-width: 1024px;
  margin: 0 auto;
  padding: 80px 16px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat strong {
  display: block;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.stat span { color: var(--muted); font-size: 15px; }

/* Feature sections */

.feature { padding: 96px 16px; }
.feature.alt { background: var(--bg-alt); }
.feature-inner {
  max-width: 1024px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 64px;
}
.feature.alt .feature-copy { order: 2; }
.feature-inner .phone { justify-self: center; }
.feature h2 {
  margin: 0 0 20px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  font-weight: 700;
}
.feature-copy > p:last-child {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--muted);
}

/* Statements (privacy, Android) */

.statement {
  padding: 120px 16px;
  text-align: center;
}
.statement h2 {
  margin: 0 auto 24px;
  max-width: 880px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  font-weight: 700;
}
.statement > p:not(.eyebrow) {
  max-width: 680px;
  margin: 0 auto 28px;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--muted);
}
.statement.dark { background: var(--dark-bg); color: var(--dark-text); }
.statement.dark .eyebrow,
.statement.dark > p:not(.eyebrow) { color: var(--dark-muted); }
.statement.dark h2 {
  background: linear-gradient(90deg, #5b9bff, #6fdc8c);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* FAQ */

.faq { padding: 96px 16px; background: var(--bg-alt); }
.faq-inner { max-width: 760px; margin: 0 auto; }
.faq h2 {
  margin: 0 0 32px;
  font-size: clamp(32px, 5vw, 48px);
  letter-spacing: -0.01em;
  text-align: center;
}
.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 0;
  font-size: 19px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 24px; line-height: 1; flex: none; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 22px; color: var(--muted); font-size: 17px; }

/* Final call to action */

.final { padding: 120px 16px; text-align: center; }
.final h2 {
  margin: 0 0 32px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.015em;
}

/* Footer */

footer { background: var(--bg-alt); border-top: 1px solid var(--border); }
.footer-inner {
  max-width: 1024px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  font-size: 12px;
  color: var(--muted);
}
.footer-inner p { margin: 0 0 10px; }
.footer-links, .footer-langs { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.footer-langs a { color: var(--muted); }

/* Narrow screens */

@media (max-width: 760px) {
  .stats { grid-template-columns: repeat(2, 1fr); padding: 64px 16px; row-gap: 36px; }
  .feature { padding: 72px 16px; }
  .feature-inner { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .feature.alt .feature-copy { order: 0; }
  .phone { max-width: 260px; border-radius: 34px; border-width: 6px; }
  .hero-phone { max-width: 280px; max-height: 420px; border-radius: 34px 34px 0 0; }
  .statement, .final { padding: 88px 16px; }
}