:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --panel: #151922;
  --panel-2: #1d2230;
  --line: #2a3142;
  --text: #eef1f7;
  --muted: #98a2b8;
  --accent: #7c8cff;
  --accent-ink: #0b0d12;
  --danger: #ff6b7a;
  --ok: #4ade80;
  --radius: 16px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

.center {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(900px 500px at 50% -10%, rgba(124, 140, 255, 0.18), transparent 70%),
    var(--bg);
}

.card {
  width: min(440px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: 0.01em;
  color: var(--muted);
  margin-bottom: 20px;
}
.brand svg { color: var(--accent); }

h1 { font-size: 24px; line-height: 1.25; margin: 0 0 8px; }
p { margin: 0 0 20px; color: var(--muted); }
p.small { font-size: 14px; margin: 16px 0 0; }
a { color: var(--accent); }

.code-input {
  width: 100%;
  padding: 16px 8px 16px 20px;
  font: 600 34px/1 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0.35em;
  text-align: center;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--line);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.15s;
}
.code-input:focus { border-color: var(--accent); }
.code-input::placeholder { color: #3a4358; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 14px;
  padding: 14px 18px;
  font: inherit;
  font-weight: 650;
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
  border-radius: 12px;
  cursor: pointer;
  transition: filter 0.15s, opacity 0.15s;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.45; cursor: default; filter: none; }
.btn.secondary { color: var(--text); background: var(--panel-2); border: 1px solid var(--line); }
.btn.danger { color: #fff; background: #c93a4b; }

.error { min-height: 22px; margin: 12px 0 0; font-size: 14px; color: var(--danger); }
.error.info { color: var(--muted); }

.big-code {
  margin: 8px 0 4px;
  font: 700 56px/1.1 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0.18em;
  padding-left: 0.18em;
  color: var(--text);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.dot.live { background: var(--ok); box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.18); }

.preview {
  width: 100%;
  margin-top: 18px;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 12px;
  border: 1px solid var(--line);
  object-fit: contain;
}