:root {
  --bg: #f4f3fb;
  --bg-accent: #ece9fb;
  --card: #ffffff;
  --text: #262833;
  --muted: #70778b;
  --primary: #7c77f0;
  --primary-hover: #6762dc;
  --danger: #ff6a88;
  --danger-hover: #eb5878;
  --item: #f8f7fd;
  --item-border: #ece9f9;
  --completed: #96a0b8;
  --shadow: 0 18px 45px rgba(68, 72, 95, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, var(--bg-accent), var(--bg) 45%);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.todo-card {
  width: min(100%, 460px);
  background: var(--card);
  border-radius: 22px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.card-header {
  margin-bottom: 20px;
}

.card-header h1 {
  margin: 0 0 6px;
  font-size: clamp(1.4rem, 2.8vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.card-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.task-entry {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.task-entry input {
  flex: 1;
  border: 1px solid var(--item-border);
  background: #fcfcff;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.96rem;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.task-entry input:focus {
  border-color: #b4aff8;
  box-shadow: 0 0 0 3px rgba(124, 119, 240, 0.18);
}

.task-entry button {
  border: 0;
  border-radius: 12px;
  padding: 0 18px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.task-entry button:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(95, 91, 210, 0.2);
}

.task-entry button:active {
  transform: translateY(0);
}

.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--item);
  border: 1px solid var(--item-border);
  border-radius: 14px;
  padding: 11px 12px;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.task-item:hover {
  transform: translateY(-1px);
  border-color: #e3dffa;
  box-shadow: 0 10px 20px rgba(71, 77, 115, 0.09);
}

.task-main {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.task-toggle {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--primary);
}

.task-text {
  overflow-wrap: anywhere;
  transition: color 180ms ease, text-decoration-color 180ms ease, opacity 180ms ease;
}

.task-item.completed .task-text {
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  text-decoration-color: #b9bfd1;
  color: var(--completed);
  opacity: 0.8;
}

.delete-btn {
  border: 0;
  background: transparent;
  color: var(--danger);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 9px;
  cursor: pointer;
  transition: color 160ms ease, background-color 160ms ease;
}

.delete-btn:hover {
  color: var(--danger-hover);
  background: #ffeef3;
}

.empty-state {
  margin: 14px 2px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 460px) {
  .todo-card {
    padding: 20px;
    border-radius: 18px;
  }

  .task-entry button {
    padding: 0 14px;
  }
}