:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card-border: #334155;
  --accent: #6ee7b7;
  --accent-hover: #34d399;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --error-bg: #7f1d1d;
  --error-border: #b91c1c;
  --success-bg: #14532d;
  --success-border: #16a34a;
  --info-bg: #1e3a5f;
  --info-border: #3b82f6;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 520px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.brand { text-align: center; margin-bottom: 1.5rem; }
.brand h1 { margin: 0; font-size: 1.75rem; letter-spacing: -0.02em; }
.tagline { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.95rem; }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.card.center { text-align: center; }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text);
}
label.inline { display: inline; margin: 0; font-weight: 400; }

textarea,
input[type="text"],
input[type="password"],
input[type="number"],
select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  padding: 0.65rem 0.75rem;
  margin-bottom: 1rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea { resize: vertical; }
.mono, textarea.mono, input.mono { font-family: var(--mono); font-size: 0.9rem; }

textarea:focus,
input:focus,
select:focus,
button:focus-visible,
a.btn:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(110, 231, 183, 0.25);
}

.hint { font-size: 0.8rem; color: var(--muted); margin: -0.6rem 0 1rem; text-align: right; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.checkbox-row input { width: auto; margin: 0; }

button, a.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, opacity 0.15s;
}
.btn-primary { width: 100%; background: var(--accent); color: #052e1f; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-secondary {
  background: transparent;
  border-color: var(--card-border);
  color: var(--text);
}
.btn-secondary:hover { background: var(--bg); }

.btn-copy { background: var(--card-border); color: var(--text); white-space: nowrap; }
.btn-copy:hover { background: #475569; }
.btn-copy.copied { background: var(--accent); color: #052e1f; }

.btn-row, .copy-row { display: flex; gap: 0.5rem; }
.btn-row .btn { flex: 1; }
.copy-row input { margin-bottom: 0; }

.alert {
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}
.alert-error { background: var(--error-bg); border-color: var(--error-border); }
.alert-success { background: var(--success-bg); border-color: var(--success-border); }
.alert-info { background: var(--info-bg); border-color: var(--info-border); }

.meta-list { list-style: none; margin: 0 0 1rem; padding: 0; }
.meta-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.9rem;
}
.meta-list li:last-child { border-bottom: none; }
.meta-list span { color: var(--muted); }
.meta-list strong { font-family: var(--mono); font-weight: 600; }

.warn { font-size: 0.85rem; color: var(--muted); background: rgba(0,0,0,0.2); padding: 0.75rem; border-radius: 8px; }
.warn code, .foot code { font-family: var(--mono); color: var(--accent); }

.muted { color: var(--muted); }
.big-icon { font-size: 3rem; margin-bottom: 0.5rem; }

.foot { text-align: center; margin-top: 1.5rem; font-size: 0.8rem; color: var(--muted); }
.foot a { color: var(--accent); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  .btn-row { flex-direction: column; }
}