:root {
  --bg: #0b1220;
  --panel: rgba(255,255,255,0.06);
  --panel-2: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.62);
  --border: rgba(255,255,255,0.12);
  --primary: #2f7cff;
  --shadow: 0 18px 50px rgba(0,0,0,0.35);
  --radius: 16px;
  --link: #7db2ff;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --panel: rgba(0,0,0,0.04);
    --panel-2: rgba(0,0,0,0.07);
    --text: rgba(0,0,0,0.92);
    --muted: rgba(0,0,0,0.60);
    --border: rgba(0,0,0,0.10);
    --shadow: 0 18px 50px rgba(0,0,0,0.12);
    --link: #2563eb;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.card {
  width: 100%;
  max-width: 720px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
h1 { margin: 0 0 8px; font-size: 20px; }
p { margin: 10px 0; color: var(--muted); line-height: 1.5; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
}
.btn.primary { background: var(--primary); border-color: transparent; color: #fff; }
.note {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  color: var(--muted);
}
.lang {
  margin-top: 8px;
  display: inline-flex;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 14px;
  overflow: hidden;
}
.lang button {
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 10px 12px;
  cursor: pointer;
  font-weight: 700;
  min-width: 56px;
}
.lang button.active { background: var(--panel-2); }