:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1e1b4b;
  --muted: #64748b;
  --line: #e6e9f4;
  --purple: #7c3aed;
  --purple-deep: #6d28d9;
  --blue: #2563eb;
  --indigo: #4f46e5;
  --danger: #e11d48;
  --shadow: 0 1px 2px rgba(30, 27, 75, 0.04), 0 14px 34px rgba(79, 70, 229, 0.08);
  --radius: 20px;
  --focus: 0 0 0 4px rgba(124, 58, 237, 0.18);
}

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

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(900px 420px at -10% -10%, rgba(196, 181, 253, 0.7), transparent 60%),
    radial-gradient(800px 380px at 110% 0%, rgba(147, 197, 253, 0.75), transparent 55%),
    var(--bg);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.icon {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
}

.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;
}

.app {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.hero {
  margin-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand__mark {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #ffffff;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--purple) 0%, var(--blue) 100%);
  box-shadow: 0 10px 24px rgba(109, 40, 217, 0.28);
}

.brand__mark .icon {
  width: 1.6rem;
  height: 1.6rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.6rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.stat,
.panel {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 92px;
  padding: 16px;
}

.stat__icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border-radius: 14px;
}

.stat__icon--purple {
  color: var(--purple-deep);
  background: #f3e8ff;
}

.stat__icon--blue {
  color: var(--blue);
  background: #dbeafe;
}

.stat__icon--indigo {
  color: var(--indigo);
  background: #e0e7ff;
}

.stat__value {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.stat__label {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
}

.panel {
  padding: 20px;
  margin-bottom: 16px;
}

.panel__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel__title {
  margin: 0 0 14px;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.panel__header .panel__title {
  margin: 0;
}

.panel__note {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.composer {
  display: flex;
  gap: 10px;
}

.composer__input {
  flex: 1;
  min-width: 0;
  height: 52px;
  padding: 0 16px;
  color: var(--text);
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.composer__input::placeholder {
  color: #94a3b8;
}

.composer__input:hover {
  border-color: #d4d8ea;
}

.composer__input:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--purple);
  box-shadow: var(--focus);
}

.composer__input[aria-invalid="true"] {
  border-color: var(--danger);
  box-shadow: 0 0 0 4px rgba(225, 29, 72, 0.12);
}

.composer__button {
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  color: #ffffff;
  white-space: nowrap;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--purple) 0%, var(--blue) 100%);
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.24);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.composer__button:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.composer__button:active {
  transform: translateY(0);
}

.composer__button:focus-visible,
.task__toggle:focus-visible,
.task__delete:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.form-message {
  margin: 10px 0 0;
  color: var(--danger);
  font-size: 0.88rem;
}

.empty {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  padding: 18px;
  color: var(--muted);
  background: #f8fafc;
  border: 1px dashed #d7dced;
  border-radius: 16px;
}

.empty[hidden],
.task-list:empty {
  display: none !important;
}

.empty__icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--purple);
  background: #f3e8ff;
  border-radius: 12px;
}

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

.task {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  background: #fbfcff;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.task--new {
  animation: rise 0.22s ease;
}

.task--done {
  background: #f8fafc;
}

.task__toggle {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px;
  text-align: left;
  color: inherit;
  background: transparent;
  border: 0;
  border-radius: 12px;
}

.task__check {
  width: 24px;
  height: 24px;
  margin-top: 1px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: transparent;
  background: #ffffff;
  border: 2px solid #c7d2fe;
  border-radius: 999px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.task__check .icon {
  width: 0.9rem;
  height: 0.9rem;
}

.task--done .task__check {
  color: #ffffff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--purple) 0%, var(--blue) 100%);
}

.task__text {
  margin: 0;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.task--done .task__text {
  color: #94a3b8;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}

.task__delete {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #94a3b8;
  background: transparent;
  border: 0;
  border-radius: 12px;
  transition: color 0.15s ease, background 0.15s ease;
}

.task__delete:hover {
  color: var(--danger);
  background: #fff1f2;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .app {
    width: min(760px, calc(100% - 20px));
    padding-top: 28px;
  }

  .brand__mark {
    width: 48px;
    height: 48px;
    border-radius: 16px;
  }

  .stats {
    gap: 8px;
  }

  .stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    min-height: 0;
    padding: 14px 12px;
  }

  .stat__value {
    font-size: 1.45rem;
  }

  .composer {
    flex-direction: column;
  }

  .composer__button {
    width: 100%;
  }

  .panel {
    padding: 16px;
  }

  .panel__header {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .stat__label {
    font-size: 0.75rem;
  }
}

@media (max-width: 420px) {
  .stats {
    grid-template-columns: 1fr;
  }

  .stat {
    flex-direction: row;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}