:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --border: #2a2f3a;
  --text: #e8eaf0;
  --muted: #8a91a3;
  --accent: #6c8cff;
  --accent-hover: #8aa3ff;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
}

* { box-sizing: border-box; }

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

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px;
}

header { text-align: center; margin-bottom: 32px; }
h1 { margin: 0 0 8px; font-size: 28px; }
.lede { color: var(--muted); margin: 0; }
.lede.small { font-size: 13px; margin-bottom: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  background: var(--bg);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 24px;
}
.tab {
  flex: 1 1 auto;
  background: transparent;
  color: var(--muted);
  border: none;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
}
.tab.active { background: var(--card); color: var(--text); }

.panel.hidden { display: none; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
}
.row label { font-size: 14px; color: var(--muted); }
.hint { opacity: 0.6; font-size: 12px; }

input[type="text"], input[type="number"], select, textarea {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus, textarea:focus {
  border-color: var(--accent);
}
.row input[type="number"], .row select { width: 180px; }
.row input[type="text"] { width: 180px; }

.checks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
  margin: 16px 0;
  font-size: 14px;
  color: var(--muted);
}
.checks label { display: flex; align-items: center; gap: 8px; cursor: pointer; }

.output {
  display: flex;
  margin: 18px 0 12px;
  gap: 8px;
  align-items: stretch;
}
.output textarea {
  flex: 1;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13px;
  resize: vertical;
  min-height: 38px;
  max-height: 280px;
  white-space: pre;
  overflow: auto;
}
.copy {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 16px;
  cursor: pointer;
  font-size: 13px;
  align-self: flex-start;
  height: 38px;
}
.copy:hover { border-color: var(--accent); }
.copy.copied { color: var(--good); border-color: var(--good); }

.actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.primary {
  flex: 1;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.primary:hover { background: var(--accent-hover); }

.secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.secondary:disabled { opacity: 0.4; cursor: not-allowed; }

.strength {
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}
.strength span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--bad);
  transition: width 0.2s, background 0.2s;
}

footer {
  text-align: center;
  margin-top: 24px;
  color: var(--muted);
  font-size: 12px;
}
footer code {
  background: var(--card);
  padding: 2px 6px;
  border-radius: 4px;
}

.error {
  color: var(--bad);
  font-size: 13px;
  margin: -6px 0 12px;
}
.error.hidden { display: none; }
.meta {
  color: var(--muted);
  font-size: 12px;
  margin: 0 0 12px;
  min-height: 1em;
}
.tab { padding: 10px 6px; }