:root{
  --bg: #f3f4f6;
  --panel: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --border: rgba(17, 24, 39, .12);
  --shadow: 0 10px 30px rgba(0,0,0,.06);

  --accent: #4b5563;
  --accent2: #6b7280;

  --inputBg: #f9fafb;
  --inputBorder: rgba(17, 24, 39, .18);

  --outputBg: #f9fafb;
  --outputBorder: rgba(17, 24, 39, .14);

  --dangerBg: #fee2e2;
  --dangerText: #991b1b;
}

:root[data-theme="dark"]{
  --bg: #0b1220;
  --panel: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: rgba(229, 231, 235, .12);
  --shadow: 0 10px 30px rgba(0,0,0,.35);

  --accent: #cbd5e1;
  --accent2: #94a3b8;

  --inputBg: #0b1220;
  --inputBorder: rgba(229, 231, 235, .18);

  --outputBg: #0b1220;
  --outputBorder: rgba(229, 231, 235, .14);

  --dangerBg: rgba(153, 27, 27, .28);
  --dangerText: #fecaca;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.4;
}

.skip-link{
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 10;
}
.skip-link:focus{ left: 10px; }

.topbar{
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 18px;
  max-width: 1100px;
  margin: 0 auto;
}

.logo{
  width: 70px;
  height: auto;
  border-radius: 90px;
  display: grid;
  place-items: center;
  display: block;
}

.theme-controls{
  display: flex;
  align-items: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.theme-label{
  font-size: 13px;
  color: var(--muted);
}
.help-text{
  font-size: 12px;
  color: var(--muted);
  width: 100%;
  text-align: right;
}

.container{
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px;
}

.card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.card-title{
  margin: 0 0 6px 0;
  font-size: 18px;
}
.muted{ color: var(--muted); }

.grid{
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 12px;
  margin-top: 12px;
}

.field label{
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
.field select, .field input{
  width: 100%;
  border-radius: 12px;
  padding: 12px 12px;
  border: 1px solid var(--inputBorder);
  background: var(--inputBg);
  color: var(--text);
  outline: none;
  font-size: 14px;
}
.field input{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  letter-spacing: .2px; /* convention pour visibilité */
}

.field select:focus, .field input:focus{
  border-color: var(--accent2);
}

.hint{
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}

.actions{
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.btn{
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}
.btn.secondary{
  background: rgba(75, 85, 99, .08);
}
:root[data-theme="dark"] .btn.secondary{
  background: rgba(148, 163, 184, .12);
}

.btn:hover{ border-color: var(--accent2); }

.results{
  margin-top: 16px;
  display: grid;
  gap: 12px;
}

.resultRow{
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: rgba(127,127,127,.03);
}
:root[data-theme="dark"] .resultRow{
  background: rgba(148, 163, 184, .07);
}

.resultMeta{
  min-width: 200px;
}
.resultLabel{ font-weight: 800; }
.resultUnit{ font-size: 12px; color: var(--muted); margin-top: 2px; }

.resultValueWrap{
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.output{
  flex: 1;
  max-width: 560px;
  text-align: right;
  padding: 12px;
  border-radius: 12px;
  background: var(--outputBg);
  border: 1px solid var(--outputBorder);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  letter-spacing: .2px; /* visibilité */
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.copyBtn{
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  white-space: nowrap;
}
.copyBtn:hover{ border-color: var(--accent2); }

.error{
  margin-top: 14px;
  padding: 12px;
  border-radius: 14px;
  background: var(--dangerBg);
  color: var(--dangerText);
  border: 1px solid rgba(153, 27, 27, .25);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.footer{
  margin-top: 14px;
  font-size: 12px;
}

code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (max-width: 820px){
  .grid{ grid-template-columns: 1fr; }
  .resultMeta{ min-width: auto; }
  .resultRow{ flex-direction: column; align-items: stretch; }
  .resultValueWrap{ justify-content: space-between; }
  .output{ max-width: none; text-align: left; justify-content: flex-start; }
}