/* Base */
:root{
  --bg: #ffffff;
  --fg: #111111;
  --muted: #6b7280;
  --card: #f6f7f9;
  --border: #e5e7eb;
  --brand: #2563eb;
  --brand-strong: #1d4ed8;
  --success: #16a34a;
  --warning: #9a3412;
  --shadow: 0 10px 24px rgba(0,0,0,.06);
  --radius: 16px;
  --transition: .18s ease;
}

/* Dark theme */
html.theme-dark {
  --bg: #0b0d10;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --card: #12151a;
  --border: #1f2937;
  --brand: #3b82f6;
  --brand-strong: #2563eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --shadow: 0 12px 28px rgba(0,0,0,.35);
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: Roboto, system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

.container{
  width:min(1100px, 92vw);
  margin-inline:auto;
  padding: 16px;
}

header{ padding-block: 20px 10px; }
h1{ font-size: clamp(22px, 3vw, 32px); margin:0 0 6px; }
.subtitle{ margin:0; color: var(--muted); }

.panel{
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.grid.two{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items:start;
}

.block{ border:none; margin:0; padding:0; }
legend{ font-weight:700; margin-bottom: 8px; }
.field{ margin-bottom: 12px; }
label{ display:block; font-weight:500; margin-bottom:6px; }
.help{ color: var(--muted); font-size: 13px; }
.checkbox{ display:flex; align-items:center; gap:10px; margin: 8px 0; }
.checkbox input{ width:18px; height:18px; }

/* Result */
.resultHeader{
  display:flex; align-items:center; justify-content:space-between; gap:8px;
  margin-bottom:10px;
}
.phraseWrap{
  background:#fff;
  border:1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  min-height: 70px;
  display:flex; align-items:center; justify-content:center;
}
html.theme-dark .phraseWrap{ background:#0d1117; }
.monospace{ font-family: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, monospace; }
.phrase{
  font-size: clamp(16px, 5vw, 36px);
  word-break: break-word;
  text-align:center;
}
.phrase.medium{ font-size: clamp(14px, 4vw, 28px); }
.phrase.small{ font-size: clamp(13px, 3.2vw, 22px); }
.phrase.tiny{ font-size: clamp(12px, 2.6vw, 18px); }

/* Coloring tokens */
.phrase .word{ color:#111111; }
html.theme-dark .phrase .word{ color:#e5e7eb; }
.phrase .digit{ color:#2563eb; font-weight:600; }
.phrase .special{ color:#dc2626; font-weight:600; }

/* History */
.historyBox{ margin-top: 12px; }
.historyActions{ display:flex; gap:8px; margin:8px 0; }
.historyList{
  list-style: decimal inside;
  margin:0; padding:0;
  display:flex; flex-direction:column; gap:6px;
  max-height: 260px; overflow:auto;
}
.historyList code{ font-family: "Roboto Mono", monospace; }

/* Buttons */
.actions{ display:flex; gap:8px; }
.actionsBottom{ display:flex; justify-content:center; padding: 10px 16px 2px; }
.btn{
  padding:12px 16px; border-radius: 999px; border:1px solid var(--border);
  background:#fff; cursor:pointer; font-weight:600;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}
html.theme-dark .btn{ background:#0d1117; color:var(--fg); }
.btn:hover{ transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.primary{
  background: var(--brand);
  color: #fff;
  border-color: transparent;
  padding: 14px 22px;
  font-size: 16px;
}
.btn.primary:hover{ background: var(--brand-strong); }
.btn.ghost{ background: transparent; color: var(--fg); }

/* Footer */
.footer{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  color: var(--muted);
  border-top:1px solid var(--border);
  margin-top: 10px;
  padding-top: 10px;
}
.footer a{ color: inherit; }

@media (max-width: 900px){
  .grid.two{ grid-template-columns: 1fr; }
}