/* Reset léger & base typographique */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: radial-gradient(circle at top left, #1e293b, #020617);
  color: #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.app {
  width: 100%;
  max-width: 900px;
  background: rgba(15, 23, 42, 0.9);
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.25);
  backdrop-filter: blur(12px);
  padding: 24px 24px 18px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.app-header h1 {
  font-size: 1.9rem;
  letter-spacing: 0.04em;
  color: #f9fafb;
  margin-bottom: 4px;
}

.app-subtitle {
  font-size: 0.9rem;
  color: #9ca3af;
}

.app-subtitle span {
  color: #38bdf8;
  font-weight: 600;
}

.app-main {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.task-stats {
  background: radial-gradient(circle at top, #020617, #020617);
  border-radius: 14px;
  border: 1px solid rgba(51, 65, 85, 0.9);
  padding: 10px 14px;
}

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

.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
}

.stat-label {
  color: #9ca3af;
}

.stat-value {
  color: #38bdf8;
  font-weight: 600;
  min-width: 20px;
  text-align: center;
}

.stat-separator {
  color: #6b7280;
  opacity: 0.6;
}

.task-input h2,
.task-column h2 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #9ca3af;
  margin-bottom: 8px;
}

.input-group {
  display: flex;
  gap: 8px;
}

#task-input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background-color: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease,
    background-color 0.15s ease;
}

#task-input::placeholder {
  color: #6b7280;
}

#task-input:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4);
  background-color: rgba(15, 23, 42, 1);
}

button[type="submit"] {
  padding: 10px 18px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  color: #0b1120;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
  transition: transform 0.12s ease, box-shadow 0.12s ease,
    filter 0.12s ease;
}

button[type="submit"]:hover {
  filter: brightness(1.08);
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.4);
  transform: translateY(-1px);
}

button[type="submit"]:active {
  transform: translateY(0);
  box-shadow: none;
}

.task-lists {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.task-column {
  background: radial-gradient(circle at top, #020617, #020617);
  border-radius: 14px;
  border: 1px solid rgba(51, 65, 85, 0.9);
  padding: 12px 12px 10px;
}

.task-list {
  list-style: none;
  margin-top: 4px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 4px;
}

.task-list--done {
  opacity: 0.9;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 9px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(51, 65, 85, 0.9);
  transition: background-color 0.12s ease, border-color 0.12s ease,
    transform 0.08s ease;
}

.task-item:hover {
  background: rgba(15, 23, 42, 1);
  border-color: rgba(148, 163, 184, 0.8);
  transform: translateY(-1px);
}

.task-item--done {
  opacity: 0.85;
  background: radial-gradient(circle at top left, #0f172a, #020617);
  border-style: dashed;
}

.task-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: #38bdf8;
  cursor: pointer;
}

.task-label {
  flex: 1;
  font-size: 0.92rem;
  color: #e5e7eb;
}

.task-label--done {
  text-decoration: line-through;
  color: #6b7280;
}

.task-meta {
  font-size: 0.7rem;
  color: #6b7280;
}

.task-delete {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  font-weight: 300;
  padding: 2px 6px;
  border-radius: 4px;
  color: #6b7280;
  opacity: 0.7;
  transition: opacity 0.15s ease, color 0.15s ease, transform 0.1s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  width: 24px;
  height: 24px;
}

.task-delete:hover {
  opacity: 1;
  color: #ef4444;
  transform: scale(1.15);
}

.task-delete:active {
  transform: scale(0.9);
}

.app-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 2px;
  font-size: 0.78rem;
  color: #6b7280;
}

.app-footer .separator {
  opacity: 0.7;
}

/* Scrollbar discrète pour les listes */
.task-list::-webkit-scrollbar {
  width: 6px;
}

.task-list::-webkit-scrollbar-track {
  background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
  background-color: rgba(148, 163, 184, 0.6);
  border-radius: 999px;
}

/* Responsive */
@media (max-width: 720px) {
  body {
    padding: 12px;
  }

  .app {
    padding: 18px 16px 12px;
  }

  .task-lists {
    grid-template-columns: 1fr;
  }

  .app-header h1 {
    font-size: 1.6rem;
  }
}