:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #5f5f66;
  --line: rgba(0, 0, 0, 0.1);
  --accent: #0a6cff;
  --chip: rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --card: #2a2a2d;
    --text: #f5f5f7;
    --muted: #a8a8b0;
    --line: rgba(255, 255, 255, 0.14);
    --accent: #4d9bff;
    --chip: rgba(255, 255, 255, 0.08);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 22px; }

header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
header.top nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; }
header.top .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text); }
header.top .brand img { width: 28px; height: 28px; border-radius: 7px; }

.lang-switch { display: none; gap: 6px; }
.js .lang-switch { display: flex; }
.lang-switch button {
  font: inherit; font-size: 13px; padding: 4px 10px; border-radius: 999px; cursor: pointer;
  background: var(--chip); color: var(--text); border: 1px solid transparent;
}
.lang-switch button[aria-pressed="true"] { background: var(--accent); color: #fff; }

.hero { text-align: center; padding: 56px 0 28px; }
.hero img.icon { width: 128px; height: 128px; border-radius: 28px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25); }
.hero h1 { font-size: 44px; line-height: 1.1; margin: 22px 0 10px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 21px; color: var(--muted); margin: 0 auto; max-width: 560px; }

.badges { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin: 28px 0 8px; }
.button {
  display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600;
  background: var(--accent); color: #fff; text-decoration: none;
}
.button:hover { text-decoration: none; filter: brightness(1.08); }
.button.secondary { background: var(--chip); color: var(--text); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; margin: 26px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; }
.card h2 { font-size: 20px; margin: 0 0 8px; }
.card ul { margin: 0; padding-left: 20px; }
.card li { margin: 4px 0; }

h2.section { font-size: 28px; margin: 40px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 20px; margin: 28px 0 6px; }
p { margin: 10px 0; }
.muted { color: var(--muted); }
kbd {
  font: 600 0.9em ui-monospace, SFMono-Regular, Menlo, monospace; padding: 2px 8px; border-radius: 7px;
  background: var(--chip); border: 1px solid var(--line);
}

details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 4px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; padding: 12px 0; }
details p { margin: 0 0 14px; }

.js .lang { display: none; }
.js .lang.active { display: block; }
.js span.lang.active { display: inline; }

footer { margin: 56px 0 40px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); text-decoration: underline; }

@media (max-width: 520px) {
  .hero h1 { font-size: 34px; }
  .hero p.lead { font-size: 18px; }
}