:root {
  font-family: "Inter", "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: light;
  --bg: #f6f8fb;
  --card: #ffffff;
  --card-soft: #f0f4fb;
  --border: rgba(15, 23, 42, 0.08);
  --text: #0f172a;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #93c5fd;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.06), transparent 35%),
    radial-gradient(circle at 90% 10%, rgba(14, 165, 233, 0.05), transparent 40%),
    var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: clamp(1.5rem, 4vw, 4rem);
}

.wrapper {
  width: min(960px, 100%);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

header {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  padding: clamp(1.5rem, 3vw, 2.75rem);
  border-radius: 1.5rem;
  box-shadow: 0 25px 55px rgba(15, 23, 42, 0.15);
}

.status-pill {
  display: inline-flex;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

header h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(2.2rem, 4vw, 3rem);
  letter-spacing: -0.035em;
}

header p {
  margin-top: 0.65rem;
  color: var(--muted);
  max-width: 65ch;
  line-height: 1.6;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--card);
  border-radius: 1.25rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.control-group {
  display: flex;
  gap: 0.85rem;
}

.control-group input {
  flex: 1;
  padding: 1.05rem 1.1rem;
  border-radius: 0.9rem;
  border: 1px solid var(--border);
  background: var(--card-soft);
  color: var(--text);
  font-size: 1rem;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

.control-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

button.primary {
  background: linear-gradient(135deg, var(--accent), #1d4ed8);
  color: #fff;
  border: none;
  font-weight: 600;
  padding: 1.05rem 1.6rem;
  border-radius: 0.9rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

button.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 32px rgba(37, 99, 235, 0.3);
}

button.danger {
  background: transparent;
  border: 1px solid rgba(220, 38, 38, 0.55);
  color: var(--danger);
  border-radius: 0.65rem;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.2s ease;
}

button.danger:hover {
  background: rgba(220, 38, 38, 0.08);
}

.todo-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.95rem 1.05rem;
  background: var(--card-soft);
  border-radius: 1rem;
  border: 1px solid transparent;
  transition: border 0.2s ease, transform 0.2s ease;
}

.todo-card:hover {
  border-color: rgba(37, 99, 235, 0.25);
  transform: translateY(-1px);
}

.todo-card span {
  flex: 1;
  margin-right: 1rem;
  font-size: 1rem;
}

.empty-state {
  padding: 1.6rem;
  border-radius: 1rem;
  background: rgba(15, 23, 42, 0.03);
  text-align: center;
  color: var(--muted);
}

.status-bar {
  font-size: 0.9rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.status-bar.success { color: var(--accent); }
.status-bar.error { color: var(--danger); }

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

@media (max-width: 640px) {
  .control-group {
    flex-direction: column;
  }

  button.primary {
    width: 100%;
  }
}