/* Variables de theme */
:root {
  --bleu-1: #0d47a1;
  --bleu-2: #1976d2;
  --bleu-3: #42a5f5;
  --bleu-4: #e3f2fd;
  --blanc: #ffffff;
  --gris-1: #f2f4f7;
  --gris-2: #d0d5dd;
  --gris-3: #98a2b3;
  --noir: #0b1323;
  --rayon: 16px;
  --ombre: 0 10px 30px rgba(13, 71, 161, 0.18);
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, Arial, sans-serif;
  color: var(--noir);
  background: radial-gradient(
        1000px 500px at 10% 0%,
        var(--bleu-4),
        var(--blanc)
      )
      fixed,
    linear-gradient(180deg, var(--blanc), var(--bleu-4));
}
.page {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px 24px;
  gap: 24px;
}

.app {
  width: 100%;
  max-width: 720px;
  background: var(--blanc);
  border: 1px solid var(--gris-2);
  border-radius: calc(var(--rayon) + 4px);
  box-shadow: var(--ombre);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  animation: apparition 0.4s ease-out both;
}
@keyframes apparition {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.app__header {
  text-align: center;
}

h1 {
  margin: 8px 0 4px;
  font-size: clamp(22px, 3vw, 28px);
}
.sous-titre {
  margin: 0;
  color: var(--gris-3);
}

/* Formulaire pour les ajouts*/
.ajout form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}
#champ-tache {
  padding: 14px 14px;
  border: 1.5px solid var(--gris-2);
  border-radius: 12px;
  outline: none;
  font-size: 16px;
  background: var(--gris-1);
  transition: border var(--transition), background var(--transition),
    box-shadow var(--transition);
}
#champ-tache:focus {
  border-color: var(--bleu-2);
  background: var(--blanc);
  box-shadow: 0 0 0 4px rgba(66, 165, 245, 0.25);
}
.btn {
  padding: 12px 16px;
  border-radius: 12px;
  border: 1.5px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition);
}
.btn:active {
  transform: translateY(1px);
}
.btn--principal {
  background: linear-gradient(135deg, var(--bleu-3), var(--bleu-2));
  color: var(--blanc);
  box-shadow: var(--ombre);
}
.btn--principal:hover {
  filter: brightness(1.05);
}
.btn--danger {
  background: var(--blanc);
  border-color: #ffb4b4;
  color: #c62828;
}
.btn--danger:hover {
  background: #ffe9e9;
}

/* Onglets */
.onglets {
  display: flex;
  gap: 8px;
  background: var(--gris-1);
  border-radius: 12px;
  padding: 6px;
}
.onglet {
  flex: 1;
  background: transparent;
  border: none;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  color: var(--noir);
}
.onglet.actif {
  background: var(--blanc);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--gris-2);
}

/* Liste */
.liste {
  background: var(--blanc);
}
#liste-taches {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.message-vide {
  text-align: center;
  color: var(--gris-3);
  padding: 16px 0 8px;
  display: none;
}
.tache {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--gris-2);
  border-radius: 12px;
  background: var(--blanc);
  transition: background var(--transition), transform var(--transition),
    border var(--transition);
  animation: slideIn 0.25s ease-out;
}
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.tache:hover {
  background: var(--bleu-4);
}
.tache__checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--bleu-2);
  cursor: pointer;
}
.tache__texte {
  margin: 0;
  word-break: break-word;
}
.tache.terminee .tache__texte {
  text-decoration: line-through;
  color: var(--gris-3);
}

.badge {
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--gris-1);
  border: 1px solid var(--gris-2);
  color: var(--gris-3);
}
.tache.terminee .badge {
  background: #e8f5e9;
  border-color: #a5d6a7;
  color: #1b5e20;
}

/* Menu */
.menu {
  position: relative;
}
.menu__bouton {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: none;
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
}
.menu__bouton:hover {
  background: rgba(0, 0, 0, 0.05);
}
.menu__liste {
  position: absolute;
  top: 42px;
  right: 0;
  min-width: 160px;
  background: var(--blanc);
  border: 1px solid var(--gris-2);
  border-radius: 12px;
  box-shadow: var(--ombre);
  padding: 6px;
  display: none;
  z-index: 10;
}
.menu.ouvert .menu__liste {
  display: block;
  animation: pop 0.12s ease-out;
}
@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
.menu__item {
  width: 100%;
  border: none;
  background: transparent;
  text-align: left;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
}
.menu__item:hover {
  background: var(--gris-1);
}

/* Actions */
.actions {
  display: flex;
  justify-content: flex-end;
}

/* Footer */
.footer {
  width: 100%;
  max-width: 720px;
  margin-top: auto;
  background: var(--blanc);
  border: 1px solid var(--gris-2);
  border-radius: calc(var(--rayon) + 4px);
  box-shadow: var(--ombre);
}
.footer__contenu {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
  padding: 14px 18px;
  font-size: 14px;
}
.footer__contenu span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (min-width: 560px) {
  .footer__contenu {
    grid-template-columns: repeat(4, 1fr);
  }
}