:root {
  --bg: #f3f4f6;          /* gris claire */
  --panel: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --border: rgba(17, 24, 39, 0.12);
  --shadow: 0 10px 30px rgba(17, 24, 39, 0.08);

  --accent: #374151;     /* gris foncé */
  --accent2: #6b7280;

  --danger: #b91c1c;

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

  --radius: 14px;
  --radius-sm: 10px;

  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Noto Sans",
          "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --panel: #111a2e;
  --text: #e5e7eb;
  --muted: #a1a1aa;
  --border: rgba(229, 231, 235, 0.14);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.35);

  --accent: #d1d5db;
  --accent2: #9ca3af;

  --focus: rgba(209, 213, 219, 0.25);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

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

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

.theme__label {
  color: var(--muted);
  font-size: 13px;
}

.theme__select {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  outline: none;
}

.theme__select:focus {
  box-shadow: 0 0 0 4px var(--focus);
}

.container {
  max-width: 980px;
  margin: 22px auto 40px;
  padding: 0 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 16px;
}

.card__title {
  margin: 0;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.card__hint {
  margin: 8px 0 14px;
  color: var(--muted);
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}

.field {
  grid-column: span 3;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field--full {
  grid-column: span 12;
}

.field label {
  color: var(--muted);
  font-size: 13px;
}

.field input {
  width: 100%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 15px;
}

.field input::placeholder {
  color: color-mix(in srgb, var(--muted) 80%, transparent);
}

.field input:focus {
  box-shadow: 0 0 0 4px var(--focus);
  border-color: color-mix(in srgb, var(--border) 40%, var(--accent) 60%);
}

.help {
  color: var(--muted);
  font-size: 12.5px;
}

.results {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.result {
  grid-column: span 4;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  border-radius: var(--radius);
  padding: 14px;
}

.result--wide { grid-column: span 12; }

.result__label {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
}

.result__value {
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 22px;
}

.result__meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.results--compact .result {
  padding: 12px;
}

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

.btn {
  border: 1px solid var(--border);
  background: var(--accent);
  color: #fff;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.btn:hover {
  filter: brightness(0.95);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 4px var(--focus);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
}

.footer {
  color: var(--muted);
  padding: 8px 6px 0;
  font-size: 12.5px;
}

/* Responsive */
@media (max-width: 900px) {
  .field { grid-column: span 6; }
  .result { grid-column: span 12; }
}

@media (max-width: 520px) {
  .topbar {
    flex-direction: column;
    align-items: stretch;
  }
  .theme { justify-content: space-between; }
  .field { grid-column: span 12; }
}