:root {
  --bg: #f4f5f9;
  --surface: #ffffff;
  --text: #161b29;
  --muted: #5d6579;
  --line: #e3e6ee;
  --accent: #3d5085;
  --accent-strong: #26345c;
  --accent-soft: #e6eaf5;
  --icon-bg: linear-gradient(160deg, #4b5d8c 0%, #1f2840 100%);
  --hero-glow: radial-gradient(60% 60% at 70% 40%, rgba(77, 99, 160, 0.22) 0%, rgba(77, 99, 160, 0) 70%);
  --shadow: 0 30px 60px -20px rgba(22, 27, 41, 0.28);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d111b;
    --surface: #161c2a;
    --text: #eef1f8;
    --muted: #9aa3b8;
    --line: #252d40;
    --accent: #9fb2e8;
    --accent-strong: #c9d4f5;
    --accent-soft: #1d2539;
    --hero-glow: radial-gradient(60% 60% at 70% 40%, rgba(99, 125, 200, 0.28) 0%, rgba(99, 125, 200, 0) 70%);
    --shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

a { color: var(--accent); }

img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Header */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 650; }
.brand img { width: 32px; height: 32px; border-radius: 8px; background: var(--icon-bg); }
.top nav { display: flex; gap: 22px; align-items: center; }
.top nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.top nav a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 14px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  white-space: nowrap;
}
.btn svg { width: 20px; height: 20px; fill: currentColor; }
.btn.small { padding: 8px 14px; font-size: 14px; border-radius: 10px; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }

/* Hero */
.hero { position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background: var(--hero-glow); pointer-events: none; }
.hero .wrap {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 72px;
}
.app-icon { width: 84px; height: 84px; border-radius: 20px; background: var(--icon-bg); box-shadow: var(--shadow); }
.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 24px 0 18px;
}
.hero h1 span { color: var(--accent); }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 30em; margin: 0 0 28px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.points { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 28px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: 15px; }
.points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 6px; }

.phone {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  padding: 10px;
  border-radius: 48px;
  background: #0b0e16;
  box-shadow: var(--shadow), inset 0 0 0 1.5px #2b3142;
}
.phone img { border-radius: 38px; width: 100%; aspect-ratio: 1320 / 2868; object-fit: cover; }

/* Sections */
section { padding: 72px 0; }
.eyebrow { color: var(--accent); font-weight: 650; font-size: 14px; letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 10px; }
h2 { font-size: clamp(30px, 4vw, 42px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 16px; }
.section-lead { color: var(--muted); max-width: 36em; margin: 0 0 40px; }

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 40px 0;
}
.feature.flip .feature-media { order: -1; }
.feature h3 { font-size: 28px; line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 14px; }
.feature p { color: var(--muted); margin: 0 0 14px; }
.feature ul { margin: 0; padding-left: 20px; color: var(--muted); }
.feature li { margin: 4px 0; }
.feature-media { display: flex; justify-content: center; }
.feature-media .phone { max-width: 270px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 24px;
}
.card .glyph {
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-size: 20px; margin-bottom: 14px;
}
.card h4 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.pro {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.pro ul { margin: 0; padding: 0; list-style: none; }
.pro li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.pro li:last-child { border-bottom: 0; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--muted); margin: 10px 0 0; }

.cta { text-align: center; }
.cta .app-icon { margin: 0 auto 20px; }
.cta p { color: var(--muted); margin: 0 auto 28px; max-width: 30em; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 32px 0 48px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }

/* Documents */
.doc { max-width: 720px; margin: 0 auto; padding: 56px 20px 80px; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); letter-spacing: -0.02em; line-height: 1.1; margin: 0 0 8px; }
.doc .meta { color: var(--muted); margin: 0 0 32px; }
.doc h2 { font-size: 22px; margin: 36px 0 10px; letter-spacing: -0.01em; }
.doc p, .doc li { color: var(--text); }
.doc ul { padding-left: 22px; }
.doc .note { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; }

/* Studio home */
.apps { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.app-card { display: flex; gap: 16px; align-items: center; text-decoration: none; color: var(--text); }
.app-card img { width: 64px; height: 64px; border-radius: 15px; background: var(--icon-bg); flex: none; }
.app-card h4 { margin: 0 0 2px; font-size: 19px; }
.app-card p { margin: 0; color: var(--muted); font-size: 15px; }
.soon { opacity: 0.6; }

@media (max-width: 820px) {
  .hero .wrap, .feature, .pro { grid-template-columns: 1fr; }
  .hero .wrap { padding-top: 40px; gap: 40px; }
  .feature { gap: 28px; }
  .feature.flip .feature-media { order: 0; }
  .grid { grid-template-columns: 1fr; }
  .top nav .hide-sm { display: none; }
  .pro { padding: 24px; }
  section { padding: 48px 0; }
}