:root {
  --bg0: #0f1419;
  --bg1: #1a2332;
  --card: #243044;
  --text: #e8eef7;
  --muted: #9aabbf;
  --accent: #3d8bfd;
  --accent2: #2f6fdb;
  --danger: #ff6b6b;
  --radius: 14px;
  --font: "Segoe UI", "PT Sans", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #2a4a7a 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1f3a2f 0%, transparent 50%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.gate {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.gate__card {
  width: 100%;
  max-width: 420px;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 32px 28px 28px;
  box-shadow: 0 20px 50px rgba(0,0,0,.35);
  backdrop-filter: blur(8px);
}

.gate__code {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.gate__title {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
}

.gate__host {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--accent);
  word-break: break-all;
}

.gate__text {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
}

.gate__error {
  margin: 0 0 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255,107,107,.12);
  color: var(--danger);
  font-size: 14px;
}

.gate__label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

.gate__input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.25);
  color: var(--text);
  font-size: 16px;
  outline: none;
  margin-bottom: 14px;
}
.gate__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61,139,253,.25);
}

.gate__btn {
  width: 100%;
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
}
.gate__btn:hover { filter: brightness(1.06); }
.gate__btn:active { transform: translateY(1px); }

@media (max-width: 480px) {
  .gate__card { padding: 26px 20px 22px; }
  .gate__title { font-size: 24px; }
}