:root {
  --bg-0: #0a0a0a;
  --bg-1: #18181b;
  --bg-2: #27272a;
  --fg: #fafafa;
  --fg-dim: #a1a1aa;
  --fg-faint: #52525b;
  --brand: #8b5cf6;
  --brand-hover: #7c3aed;
  --error: #f87171;
  --twitch: #9146ff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg-0);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.card {
  width: 100%;
  max-width: 24rem;
  text-align: center;
}

h1 { font-size: 1.5rem; font-weight: 700; }
.subtitle { margin-top: 0.5rem; font-size: 0.875rem; color: var(--fg-dim); }
.hint { margin-top: 1rem; font-size: 0.75rem; color: var(--fg-faint); }

form { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 1rem; }

input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-1);
  border: 1px solid var(--bg-2);
  border-radius: 0.75rem;
  color: var(--fg);
  font-family: ui-monospace, monospace;
  font-size: 1.125rem;
  text-align: center;
  letter-spacing: 0.25em;
}
input:focus { outline: none; border-color: var(--brand); }
input::placeholder { color: var(--fg-faint); letter-spacing: normal; }

button {
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  cursor: pointer;
  transition: background-color 0.15s;
}
button:disabled { background: var(--bg-2); color: var(--fg-faint); cursor: not-allowed; }

.btn-primary { background: var(--brand); }
.btn-primary:not(:disabled):hover { background: var(--brand-hover); }
.btn-twitch { background: var(--twitch); display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; }
.btn-twitch:hover { filter: brightness(1.1); }

.error { font-size: 0.875rem; color: var(--error); min-height: 1.25rem; }

.spinner {
  width: 2.5rem; height: 2.5rem; margin: 0 auto;
  border: 3px solid var(--bg-2);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.progress { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 2rem; }
.step {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-1);
  border: 1px solid var(--bg-2);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--fg-dim);
  text-align: left;
}
.step.active { color: var(--fg); border-color: var(--brand); }
.step.done { color: var(--fg); }
.step.done .icon::before { content: "✓"; color: #4ade80; }
.step.active .icon::before { content: ""; display: inline-block; width: 0.75rem; height: 0.75rem;
  border: 2px solid var(--brand); border-top-color: transparent; border-radius: 50%;
  animation: spin 0.8s linear infinite; }
.step .icon::before { content: "○"; color: var(--fg-faint); }
.step .icon { width: 1rem; display: inline-block; }

.elapsed { margin-top: 1.5rem; font-size: 0.75rem; color: var(--fg-faint); font-variant-numeric: tabular-nums; }