:root {
  --bg1: #0b1020;
  --bg2: #111827;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-strong: rgba(255, 255, 255, 0.12);
  --border: rgba(255, 255, 255, 0.14);
  --text: #f8fafc;
  --muted: rgba(248, 250, 252, 0.7);
  --primary: #8b5cf6;
  --primary2: #22c55e;
  --danger: #fb7185;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

body.light {
  --bg1: #edf4ff;
  --bg2: #f8fbff;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-strong: rgba(255, 255, 255, 0.75);
  --border: rgba(15, 23, 42, 0.08);
  --text: #0f172a;
  --muted: rgba(15, 23, 42, 0.65);
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Poppins", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(139, 92, 246, 0.35), transparent 32%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.20), transparent 28%),
    radial-gradient(circle at bottom left, rgba(59, 130, 246, 0.18), transparent 30%),
    linear-gradient(135deg, var(--bg1), var(--bg2));
  display: grid;
  place-items: center;
  padding: 24px;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.45), transparent 85%);
  pointer-events: none;
}

.blob {
  position: fixed;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  pointer-events: none;
}

.blob-1 { top: 20px; left: 30px; background: #8b5cf6; }
.blob-2 { top: 120px; right: 40px; background: #22c55e; }
.blob-3 { bottom: 20px; left: 35%; background: #38bdf8; }

.app {
  width: min(980px, 100%);
  z-index: 1;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1;
}

.subtitle {
  margin: 12px 0 0;
  max-width: 540px;
  color: var(--muted);
}

.theme-btn {
  width: 52px;
  height: 52px;
  border: 1px solid var(--border);
  background: var(--glass);
  backdrop-filter: blur(18px);
  border-radius: 18px;
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
}

.hero-card,
.glass-card {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.hero-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  border-radius: 30px;
  padding: 24px;
  margin-bottom: 18px;
}

.hero-left h2 {
  margin: 0 0 8px;
  font-size: 1.4rem;
}

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

.ring {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--primary) 0deg, rgba(255,255,255,0.12) 0deg);
  border: 10px solid rgba(255,255,255,0.05);
  box-shadow: inset 0 0 25px rgba(255,255,255,0.08);
}

.ring span {
  width: 82px;
  height: 82px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--bg2);
  font-weight: 700;
  font-size: 1.05rem;
}

.glass-card {
  border-radius: 34px;
  padding: 26px;
}

.input-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

input[type="text"] {
  flex: 1;
  min-width: 220px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  outline: none;
  background: var(--glass-strong);
  color: var(--text);
  font-size: 1rem;
}

input[type="text"]::placeholder {
  color: var(--muted);
}

input[type="text"]:focus {
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.18);
  border-color: rgba(139, 92, 246, 0.55);
}

.add-btn,
.ghost-btn,
.chip,
.edit-btn,
.delete-btn {
  border: 1px solid var(--border);
  background: var(--glass-strong);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  transition: 0.25s ease;
}

.add-btn {
  padding: 16px 22px;
  border-radius: 18px;
  background: linear-gradient(135deg, #8b5cf6, #6d28d9);
  border: none;
  font-weight: 700;
  color: white;
  box-shadow: 0 14px 28px rgba(139, 92, 246, 0.35);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 18px 0;
}

.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chip,
.ghost-btn,
.edit-btn,
.delete-btn {
  border-radius: 16px;
  padding: 10px 14px;
}

.chip.active {
  background: var(--primary);
  color: white;
  border-color: transparent;
}

.ghost-btn:hover,
.chip:hover,
.edit-btn:hover,
.delete-btn:hover,
.add-btn:hover,
.theme-btn:hover {
  transform: translateY(-2px);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}

.stat {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  text-align: center;
}

.stat span {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
}

.stat p {
  margin: 4px 0 0;
  color: var(--muted);
}

.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.todo-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border-radius: 22px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  animation: rise 0.25s ease;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.todo-main {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.complete-toggle {
  display: none;
}

.check {
  width: 22px;
  height: 22px;
  border-radius: 7px;
  border: 2px solid var(--muted);
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
}

.complete-toggle:checked + .check {
  border-color: var(--primary2);
  background: var(--primary2);
}

.complete-toggle:checked + .check::after {
  content: "✓";
  color: white;
  font-size: 0.8rem;
  font-weight: 800;
}

.todo-text {
  word-break: break-word;
}

.todo-item.completed .todo-text {
  color: var(--muted);
  text-decoration: line-through;
}

.todo-actions {
  display: flex;
  gap: 8px;
}

.edit-btn {
  color: white;
  background: rgba(59, 130, 246, 0.22);
}

.delete-btn {
  color: white;
  background: rgba(251, 113, 133, 0.9);
  border-color: transparent;
}

.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 26px 10px;
}

@media (max-width: 720px) {
  .topbar,
  .hero-card,
  .toolbar,
  .todo-item {
    flex-direction: column;
    align-items: stretch;
  }

  .stats {
    grid-template-columns: 1fr;
  }

  .todo-actions {
    width: 100%;
  }

  .todo-actions button {
    flex: 1;
  }
}