:root{
  --bg: #f5f6f8;          /* gris clair */
  --card: #ffffffcc;
  --text: #121418;
  --muted: #4b5563;
  --border: rgba(17, 24, 39, .12);
  --shadow: 0 10px 28px rgba(0,0,0,.08);
  --accent: #2563eb;
  --accent2: #60a5fa;

  --danger: #dc2626;
  --success: #16a34a;

  --focus: rgba(37, 99, 235, .25);

  --radius: 16px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

[data-theme="dark"]{
  --bg: #0f1115;
  --card: rgba(18, 22, 28, .72);
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: rgba(229, 231, 235, .14);
  --shadow: 0 10px 28px rgba(0,0,0,.35);

  --accent: #7c3aed;
  --accent2: #a78bfa;

  --danger: #ef4444;
  --success: #22c55e;

  --focus: rgba(124, 58, 237, .28);
}

@media (prefers-color-scheme: dark){
  :root[data-theme="system"]{
    --bg: #0f1115;
    --card: rgba(18, 22, 28, .72);
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: rgba(229, 231, 235, .14);
    --shadow: 0 10px 28px rgba(0,0,0,.35);

    --accent: #7c3aed;
    --accent2: #a78bfa;

    --danger: #ef4444;
    --success: #22c55e;

    --focus: rgba(124, 58, 237, .28);
  }
}

*{ box-sizing: border-box; }

body{
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.topbar{
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(10px);
  background: linear-gradient(to bottom, rgba(255,255,255,.35), rgba(255,255,255,.15));
  border-bottom: 1px solid var(--border);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

html[data-theme="dark"] .topbar,
:root[data-theme="dark"] .topbar{
  background: linear-gradient(to bottom, rgba(0,0,0,.35), rgba(0,0,0,.08));
}

.brand__title{
  font-weight: 800;
  letter-spacing: .2px;
}
.brand__subtitle{
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.theme{
  display: flex;
  align-items: center;
  gap: 12px;
}
.theme__label{
  font-size: 12px;
  color: var(--muted);
}
.theme__controls{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip{
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 8px 10px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 650;
  font-size: 13px;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.chip:hover{ transform: translateY(-1px); }
.chip[aria-pressed="true"]{
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border-color: color-mix(in oklab, var(--accent) 55%, var(--border));
}

.container{
  width: min(980px, calc(100% - 32px));
  margin: 20px auto 34px;
}

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

.card--secondary{
  margin-top: 16px;
}

.card__title{
  margin: 0 0 10px;
  font-size: 20px;
}
.card__title--small{
  font-size: 16px;
  margin: 0;
}
.card__help{
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.5;
}

.form{ display: grid; gap: 14px; }

.field label{
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.row{
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: 10px;
  align-items: center;
}

input, select{
  width: 100%;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.45);
  color: var(--text);
  outline: none;
  font-size: 14px;
}

:root[data-theme="dark"] input,
:root[data-theme="dark"] select{
  background: rgba(0,0,0,.25);
}

input:focus, select:focus{
  box-shadow: 0 0 0 4px var(--focus);
  border-color: color-mix(in oklab, var(--accent) 60%, var(--border));
}

.field__error{
  margin-top: 6px;
  min-height: 18px;
  color: var(--danger);
  font-size: 12px;
}

.actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.btn{
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-weight: 750;
  font-size: 14px;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn:active{ transform: translateY(0); }

.btn--primary{
  background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent2) 55%, var(--accent)));
  color: white;
  border-color: transparent;
}
.btn--ghost{
  background: transparent;
  color: var(--text);
}

.result{
  border-top: 1px dashed var(--border);
  padding-top: 14px;
  display: grid;
  gap: 10px;
}

.result__item{
  display: grid;
  gap: 6px;
}
.result__label{
  font-size: 12px;
  color: var(--muted);
}
.result__value{
  font-size: 28px;
  font-weight: 900;
  letter-spacing: .2px;
}

.result__meta{
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.note{
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(37, 99, 235, .06);
}
.note__dot{
  width: 10px;
  height: 10px;
  border-radius: 999px;
  margin-top: 4px;
  background: var(--accent);
  flex: 0 0 auto;
}
:root[data-theme="dark"] .note{
  background: rgba(124, 58, 237, .12);
}

.card__row{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.card__actions{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.history{
  margin-top: 8px;
  display: grid;
  gap: 10px;
}
.historyItem{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.35);
  border-radius: 14px;
  padding: 12px;
}
:root[data-theme="dark"] .historyItem{
  background: rgba(0,0,0,.18);
}

.historyItem__top{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.historyItem__speed{
  font-weight: 950;
}
.historyItem__time{
  font-size: 12px;
  color: var(--muted);
}
.historyItem__details{
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.45;
}

.history__empty{
  color: var(--muted);
  font-size: 13px;
  margin-top: 10px;
}

.footer{
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}