:root {
  --bg: #0a1124; --panel: #0f1a33; --panel-2: #13213f; --border: #1e3260;
  --text: #e6edf8; --muted: #8a9bbd; --blue: #2563eb; --cyan: #22d3ee; --green: #22c55e; --red: #ef4444; --amber: #f59e0b;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; background: radial-gradient(120% 60% at 100% 0%, rgba(37, 99, 235, 0.18), transparent 60%), var(--bg);
  color: var(--text); font: 15px/1.5 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex; justify-content: center; padding: 32px 16px;
}
main { width: 100%; max-width: 420px; display: flex; flex-direction: column; gap: 18px; }
.hero { text-align: center; display: flex; flex-direction: column; align-items: center; gap: 6px; }
h1 { margin: 6px 0 0; font-size: 34px; font-weight: 900; letter-spacing: 0.04em; }
h1 span { color: #3b82f6; }
.muted { color: var(--muted); }
ul { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: #c3cee3; }
li::before { content: '✓ '; color: var(--green); font-weight: 800; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.invite { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--cyan); background: rgba(34, 211, 238, 0.08); color: var(--cyan); font-weight: 700; font-size: 14px; }
input {
  width: 100%; height: 44px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); font: inherit;
}
input:focus, button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 1px; }
button {
  height: 46px; border: 0; border-radius: 10px; font: inherit; font-weight: 800; letter-spacing: 0.03em; color: #fff; cursor: pointer;
  background: linear-gradient(135deg, var(--blue), #0891b2); box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}
button:disabled { background: #1b2a4d; color: #7183a8; box-shadow: none; cursor: not-allowed; }
.msg { margin: 0; font-size: 14px; }
.ok { color: var(--green); }
.err { color: var(--red); }
.warn { color: var(--amber); }
.small { font-size: 12.5px; }
a.download {
  display: block; text-align: center; padding: 12px; border-radius: 10px; border: 1px solid var(--green);
  color: var(--green); font-weight: 800; text-decoration: none;
}
footer { text-align: center; font-size: 12px; }
[hidden] { display: none !important; }