:root {
  color-scheme: light dark;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #141821;
  --muted: #5d6675;
  --line: #dbe2ea;
  --blue: #1177ee;
  --cyan: #12c6d8;
  --shadow: 0 20px 60px rgba(23, 37, 62, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 10%, rgba(18, 198, 216, 0.18), transparent 34rem),
    radial-gradient(circle at 88% 20%, rgba(17, 119, 238, 0.14), transparent 32rem),
    var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}

.brand,
nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  text-decoration: none;
  font-weight: 800;
  font-size: 1.1rem;
}

nav a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

nav a:hover {
  color: var(--text);
}

.app-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: block;
  object-fit: cover;
  box-shadow: 0 12px 28px rgba(17, 119, 238, 0.28);
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 48px;
  align-items: center;
  min-height: 620px;
}

.eyebrow {
  color: var(--blue);
  font-weight: 750;
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(2.7rem, 7vw, 5.8rem);
  line-height: 0.95;
  margin: 0;
  max-width: 760px;
}

h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  margin: 0 0 14px;
}

h3 {
  margin: 0 0 8px;
}

.lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.66);
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(145deg, var(--cyan), var(--blue));
  color: #fff;
}

.phone-preview {
  width: min(100%, 360px);
  min-height: 600px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 38px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.phone-status {
  width: 90px;
  height: 8px;
  margin: 0 auto 34px;
  border-radius: 999px;
  background: #1b2230;
}

.preview-title {
  font-size: 1.28rem;
  font-weight: 800;
  margin-bottom: 18px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.preview-grid span {
  aspect-ratio: 1;
  border-radius: 18px;
  background:
    linear-gradient(145deg, rgba(17, 119, 238, 0.18), rgba(18, 198, 216, 0.2)),
    #eaf0f7;
}

.preview-card,
.localized-panel,
.feature-grid article,
.simple-card {
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.74);
  box-shadow: 0 16px 42px rgba(20, 24, 33, 0.08);
}

.preview-card {
  display: grid;
  gap: 4px;
  margin-top: 16px;
  padding: 16px;
}

.preview-card small,
p,
li {
  color: var(--muted);
  line-height: 1.58;
}

.section {
  padding: 52px 0;
}

.language-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.language-tabs a {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
}

.localized-panel {
  margin: 14px 0;
  padding: 22px;
  scroll-margin-top: 18px;
}

.feature-grid,
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article,
.support-grid article {
  padding: 22px;
}

.simple-page {
  max-width: 880px;
  padding-top: 80px;
}

.simple-card {
  margin: 18px 0;
  padding: 24px;
}

footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080b12;
    --surface: #111722;
    --text: #f5f7fb;
    --muted: #a7b0c0;
    --line: #263242;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  }

  .button,
  .phone-preview,
  .localized-panel,
  .feature-grid article,
  .support-grid article,
  .simple-card,
  .language-tabs a {
    background: rgba(17, 23, 34, 0.72);
    border-color: rgba(255, 255, 255, 0.08);
  }

  .preview-grid span {
    background:
      linear-gradient(145deg, rgba(17, 119, 238, 0.22), rgba(18, 198, 216, 0.16)),
      #182234;
  }

  .phone-status {
    background: #f5f7fb;
  }
}

@media (max-width: 800px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 40px 0;
  }

  .phone-preview {
    min-height: 480px;
  }

  .feature-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }
}