/* Base / variables */
:root {
  color-scheme: light;

  --bg: #f3f5f7;          /* gris claire */
  --surface: #ffffff;
  --text: #1f2937;        /* gris très sombre */
  --muted: #4b5563;       /* texte secondaire */
  --border: rgba(31, 41, 55, 0.14);

  --primary: #374151;     /* gris */
  --primary-2: #111827;

  --btn-bg: #e5e7eb;
  --btn-text: #111827;
  --btn-border: rgba(17, 24, 39, 0.2);

  --ghost-bg: transparent;
  --ghost-text: var(--primary-2);

  --focus: rgba(55, 65, 81, 0.35);

  --shadow: 0 10px 30px rgba(17, 24, 39, 0.08);

  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0f1216;
  --surface: #171b21;
  --text: #e5e7eb;
  --muted: #a1a1aa;
  --border: rgba(229, 231, 235, 0.14);

  --primary: #d1d5db;
  --primary-2: #f9fafb;

  --btn-bg: #232a33;
  --btn-text: #f9fafb;
  --btn-border: rgba(249, 250, 251, 0.18);

  --ghost-text: #f9fafb;

  --focus: rgba(209, 213, 219, 0.35);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

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

.mono { font-family: var(--mono); }

a { color: inherit; }

.app-header {
  max-width: 980px;
  margin: 18px auto 0;
  padding: 0 16px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}

.logo{
  width: 70px;
  height: auto;
  border-radius: 90px;
  display: grid;
  place-items: center;
  display: block;
}
.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
}
.theme-controls {
  display: grid;
  gap: 6px;
  align-items: start;
}
.theme-label {
  color: var(--muted);
  font-size: 0.9rem;
}
.theme-select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
.theme-select:focus {
  box-shadow: 0 0 0 4px var(--focus);
  border-color: transparent;
}

.container {
  max-width: 980px;
  margin: 18px auto 30px;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 920px) {
  .container { grid-template-columns: 1.15fr 0.85fr; }
}

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

.card h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.form .field { margin-bottom: 14px; }
.field label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}
.field .help {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}
.label-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
}
.pill {
  background: rgba(55, 65, 81, 0.08);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--text);
  font-size: 0.85rem;
}

.inline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 560px) {
  .inline-grid { grid-template-columns: 1fr 1fr; }
}

input, select {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  outline: none;
  font-size: 1rem;
}
input::placeholder { color: rgba(75, 85, 99, 0.8); }
input:focus, select:focus {
  box-shadow: 0 0 0 4px var(--focus);
  border-color: transparent;
}

.select { appearance: none; }

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.btn {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 12px;
  padding: 11px 14px;
  cursor: pointer;
  font-weight: 600;
}
.btn:hover { filter: brightness(1.02); }
.btn:active { transform: translateY(1px); }

.btn-ghost {
  background: var(--ghost-bg);
  border: 1px solid var(--border);
  color: var(--ghost-text);
}

.result {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
}

.result-label {
  color: var(--muted);
  font-size: 0.95rem;
}
.result-value {
  font-size: 1.25rem;
}

.fineprint p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.tips .list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.6;
}

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