:root {
  --brand: #3B5BDB;
  --brand-soft: #E3EAFB;
  --bg: #F4F6FB;
  --card: #FFFFFF;
  --text: #171B26;
  --subtext: #5B6478;
  --border: #D9DEE9;
  --todo-bg: #FFF3CD;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 12px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; }
.logo { font-size: 1.4rem; }
nav a { color: var(--brand); text-decoration: none; font-weight: 600; margin-left: 18px; }
nav a:hover { text-decoration: underline; }
main { max-width: 860px; margin: 0 auto; padding: 40px 24px 64px; }
.hero h1 { font-size: clamp(2rem, 6vw, 3.2rem); line-height: 1.15; margin-bottom: 16px; }
.hero .sub { font-size: 1.15rem; color: var(--subtext); max-width: 640px; }
.badges { margin: 20px 0 8px; display: flex; gap: 10px; flex-wrap: wrap; }
.badge {
  background: var(--brand-soft); color: var(--brand);
  padding: 5px 14px; border-radius: 999px; font-weight: 700; font-size: .9rem;
}
.stores { margin-top: 18px; }
.store {
  display: inline-block; background: var(--brand); color: #fff;
  padding: 13px 26px; border-radius: 12px; text-decoration: none;
  font-weight: 700; opacity: .85; cursor: default;
}
.store.secondary {
  background: var(--card); color: var(--brand);
  border: 2px solid var(--brand); opacity: 1; cursor: pointer;
}
.store.secondary:hover { background: var(--brand-soft); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 48px; }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.feature h3 { margin-bottom: 8px; }
.feature p { color: var(--subtext); font-size: .95rem; }
.doc { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px clamp(18px, 4vw, 36px); }
.doc h1 { font-size: 1.7rem; margin-bottom: 4px; }
.doc .stand { color: var(--subtext); font-size: .9rem; margin-bottom: 24px; }
.doc h2 { font-size: 1.15rem; margin: 26px 0 8px; }
.doc h3 { font-size: 1rem; margin: 18px 0 6px; }
.doc p, .doc li { color: #333c4e; font-size: .96rem; margin-bottom: 8px; }
.doc ul { padding-left: 22px; }
.doc a { color: var(--brand); }
footer { text-align: center; color: var(--subtext); font-size: .88rem; padding: 28px 16px; }
footer a { color: var(--brand); text-decoration: none; }
.todo {
  background: var(--todo-bg); border: 1px dashed #d4a017;
  border-radius: 6px; padding: 1px 7px; font-weight: 600;
}
.lang-switch { margin-bottom: 18px; }
.lang-switch a {
  display: inline-block; margin-right: 10px; padding: 6px 16px;
  border-radius: 999px; border: 1px solid var(--border);
  text-decoration: none; color: var(--subtext); font-weight: 600; font-size: .9rem;
}
.lang-switch a.active { background: var(--brand-soft); color: var(--brand); border-color: var(--brand); }
@media (max-width: 600px) { header { justify-content: center; } }