:root{
  --bg: #f3f4f6;        /* gris clair */
  --card: #ffffff;
  --text: #111827;      /* texte très lisible */
  --muted: #4b5563;
  --border: #d1d5db;
  --accent: #6b7280;    /* gris moyen */
  --accent-2: #374151;
}

*{ box-sizing: border-box; }

body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container{
  max-width: 980px;
  margin: 26px auto;
  padding: 0 16px;
}

.top{
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 14px;
}

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

h1{
  margin: 0;
  font-size: 28px;
  letter-spacing: 0.2px;
}

.subtitle{
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14.5px;
}

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}

h2{
  margin: 0 0 12px;
  font-size: 18px;
}

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

@media (max-width: 720px){
  .grid{ grid-template-columns: 1fr; }
}

.field{
  display: grid;
  gap: 8px;
}

.field span{
  font-weight: 650;
  color: var(--accent-2);
}

input{
  width: 100%;
  padding: 12px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 16px;
  outline: none;
  color: var(--text);
  background: #f9fafb;
}

input:focus{
  border-color: #9ca3af;
  box-shadow: 0 0 0 3px rgba(156, 163, 175, 0.25);
}

.actions{
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.btn{
  cursor: pointer;
  border: 1px solid var(--border);
  background: #eef0f3;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  font-size: 15px;
}

.btn:hover{ background: #e5e7eb; }

.btn-ghost{
  background: transparent;
}

.hint{
  min-height: 22px;
  margin: 10px 0 0;
  color: #b45309; /* orange doux pour erreurs/infos */
  font-weight: 600;
}

.results{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 720px){
  .results{ grid-template-columns: 1fr; }
}

.result{
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #fafafa;
}

.label{
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 650;
}

.value{
  margin-top: 6px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.vizWrap{
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: #fafafa;
  color: #6b7280; /* couleur du svg via currentColor */
}

svg{
  width: 100%;
  height: auto;
  display: block;
}

.gridlines line{
  stroke: rgba(107,114,128,0.25);
  stroke-width: 2;
}

.small{ color: var(--muted); font-size: 13.5px; margin: 0; }
.footer{ padding: 8px 2px 0; }