/* Base & lisibilité */
:root {
  --bg: #f6f7f8;
  --panel: #ffffff;
  --text: #121316;
  --muted: #5b616b;
  --border: rgba(18, 19, 22, 0.12);
  --shadow: rgba(0, 0, 0, 0.06);

  --primary: #2f3a4a;
  --primary-2: #3b4a5f;
  --secondary: #e9ecef;

  --focus: rgba(47, 58, 74, 0.28);

  --radius: 14px;
  --gap: 14px;

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

:root[data-theme="dark"] {
  --bg: #0f1115;
  --panel: #141823;
  --text: #eef1f6;
  --muted: #aeb6c4;
  --border: rgba(238, 241, 246, 0.12);
  --shadow: rgba(0, 0, 0, 0.35);

  --primary: #cfd7e3;
  --primary-2: #b7c4d6;
  --secondary: #1b2230;

  --focus: rgba(207, 215, 227, 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: 1.35;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

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

.dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent);
}

.title {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.container {
  max-width: 860px;
  margin: 22px auto;
  padding: 0 16px 28px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px var(--shadow);
  padding: 16px;
}

.card.subtle {
  box-shadow: none;
}

.card-title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 750;
  letter-spacing: 0.2px;
}

.hint {
  margin: 0 0 12px;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--gap);
  align-items: end;
}

.field {
  display: grid;
  gap: 6px;
}

.label {
  color: var(--muted);
  font-size: 0.9rem;
}

input, select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  outline: none;
  font-size: 1rem;
}

input::placeholder {
  color: color-mix(in srgb, var(--muted) 65%, transparent);
}

input:focus, select:focus,
button:focus-visible {
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border));
  box-shadow: 0 0 0 4px var(--focus);
}

.result {
  margin-top: 14px;
  display: grid;
  gap: 10px;
}

.result-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
}

.result-label {
  color: var(--muted);
}

.result-value {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.2px;
}

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

.primary-btn, .secondary-btn, .theme-btn {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  font-weight: 650;
  background: var(--secondary);
  color: var(--text);
  transition: transform 0.05s ease, background 0.15s ease;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #0b0d10;
  border-color: transparent;
}

:root[data-theme="dark"] .primary-btn {
  color: #0b0d10;
}

.primary-btn:active,
.secondary-btn:active,
.theme-btn:active {
  transform: translateY(1px);
}

.note {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.chip {
  background: var(--secondary);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 650;
}

.chip:focus-visible {
  outline: none;
}

.formula .muted {
  margin: 0;
  color: var(--muted);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
}

/* Thème: label */
.theme-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-btn {
  padding: 10px 12px;
}

/* Responsive */
@media (max-width: 760px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .actions {
    justify-content: flex-start;
  }
  .topbar {
    align-items: flex-start;
  }
}