:root {
  --bg: #09090b;
  --card: rgba(39, 39, 42, 0.85);
  --border: rgba(255, 255, 255, 0.1);
  --text: #fafafa;
  --muted: rgba(255, 255, 255, 0.5);
  --accent: #a3e635;
  --err: #fca5a5;
  --radius: 1rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: ui-sans-serif, system-ui, "Segoe UI", "Noto Sans TC", sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #27272a 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.5;
}

.shell {
  max-width: 28rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.head h1 {
  margin: 0 0 0.35rem;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.card {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.35);
  color: var(--text);
  font-size: 0.9375rem;
  outline: none;
}

.input:focus {
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.12);
}

.input::placeholder {
  color: rgba(255, 255, 255, 0.28);
}

.btn {
  margin-top: 0.85rem;
  width: 100%;
  padding: 0.65rem 1rem;
  border-radius: 0.75rem;
  border: none;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn.primary {
  background: linear-gradient(180deg, #ecfccb 0%, var(--accent) 100%);
  color: #171717;
}

.btn.primary:not(:disabled):hover {
  filter: brightness(1.05);
}

.btn.primary:not(:disabled):active {
  transform: scale(0.99);
}

.btn.ghost {
  margin-top: 0;
  width: auto;
  flex-shrink: 0;
  padding: 0.4rem 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.12);
}

.out {
  margin-top: 1rem;
}

.out-label {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.out-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.out-link {
  flex: 1;
  min-width: 0;
  word-break: break-all;
  font-family: ui-monospace, monospace;
  font-size: 0.8125rem;
  color: #bef264;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.err {
  margin-top: 1rem;
  padding: 0.65rem 0.85rem;
  border-radius: 0.75rem;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: var(--err);
  font-size: 0.875rem;
}

.foot {
  margin-top: 2rem;
  text-align: center;
}

.foot small {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.32);
}

.foot code {
  font-size: 0.65rem;
  padding: 0.1rem 0.25rem;
  border-radius: 0.25rem;
  background: rgba(255, 255, 255, 0.06);
}

.hidden {
  display: none !important;
}