:root {
  color-scheme: light;
  --bg: #eef2ff;
  --card: rgba(255, 255, 255, 0.9);
  --text: #111827;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --danger: #dc2626;
  --border: #dbeafe;
  --success-bg: #dcfce7;
  --success-text: #166534;
  --error-bg: #fee2e2;
  --error-text: #991b1b;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(79, 70, 229, 0.22), transparent 32rem),
    linear-gradient(135deg, #f8fafc 0%, var(--bg) 100%);
  color: var(--text);
}

button,
input,
textarea {
  font: inherit;
}

button,
a {
  transition: 160ms ease;
}

.shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--primary);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 8vw, 5rem);
  line-height: 0.95;
}

.subtitle {
  margin: 14px auto 0;
  color: var(--muted);
  max-width: 540px;
  font-size: 1.1rem;
}

.card {
  background: var(--card);
  border: 1px solid rgba(219, 234, 254, 0.85);
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(30, 41, 59, 0.11);
  backdrop-filter: blur(14px);
}

.add-card {
  padding: 24px;
}

.add-form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 8px;
  color: #374151;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 16px;
  padding: 13px 15px;
  background: #fff;
  color: var(--text);
  outline: none;
}

input:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

textarea {
  resize: vertical;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  background: var(--primary);
  color: white;
  font-weight: 800;
  cursor: pointer;
}

button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.messages {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.message {
  border-radius: 16px;
  padding: 12px 16px;
  font-weight: 700;
}

.message.success {
  background: var(--success-bg);
  color: var(--success-text);
}

.message.error {
  background: var(--error-bg);
  color: var(--error-text);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  justify-content: space-between;
  margin: 22px 0;
}

.stats,
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stats span,
.filters a,
.ghost {
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  padding: 9px 13px;
  background: rgba(255, 255, 255, 0.72);
  color: #475569;
  text-decoration: none;
  font-weight: 800;
  font-size: 0.92rem;
}

.filters a.active,
.filters a:hover {
  background: #ede9fe;
  border-color: #c4b5fd;
  color: var(--primary-dark);
}

.ghost {
  cursor: pointer;
}

.ghost:hover {
  background: #fff;
  color: var(--danger);
  border-color: #fecaca;
  transform: none;
}

.todo-list {
  display: grid;
  gap: 14px;
}

.todo {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: start;
  padding: 18px;
}

.check {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  padding: 0;
  background: #fff;
  border: 2px solid var(--primary);
  color: var(--primary);
  font-size: 1.1rem;
}

.done .check {
  background: var(--primary);
  color: #fff;
}

.done .todo-title,
.done .todo-desc {
  color: var(--muted);
  text-decoration: line-through;
}

.todo-content summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 5px;
}

.todo-content summary::-webkit-details-marker {
  display: none;
}

.todo-title {
  font-weight: 900;
  font-size: 1.08rem;
}

.todo-desc,
.todo-date {
  color: var(--muted);
}

.todo-date {
  font-size: 0.82rem;
}

.edit-form {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.danger:hover {
  background: #fee2e2;
  color: #991b1b;
  transform: none;
}

.empty {
  padding: 38px;
  text-align: center;
}

.empty h2 {
  margin: 0 0 8px;
}

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

@media (max-width: 680px) {
  .shell {
    width: min(100% - 20px, 980px);
    padding: 28px 0;
  }

  .todo {
    grid-template-columns: auto 1fr;
  }

  .delete-form {
    grid-column: 2;
  }

  .toolbar {
    align-items: stretch;
  }
}