:root {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #0f172a;
  background: #f4f6fb;
  line-height: 1.5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem clamp(1rem, 4vw, 4rem);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.eyebrow,
.card-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  margin: 0;
  color: #6366f1;
}

.subtitle {
  margin: 0.25rem 0 0;
  color: #475569;
}

.user-chip {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: #eef2ff;
  color: #312e81;
  font-weight: 600;
}

main {
  display: grid;
  gap: 1.5rem;
}

.card {
  background: #fff;
  border-radius: 1.25rem;
  padding: 1.5rem;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

h1,
h2 {
  margin: 0.25rem 0 0;
}

.grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 0.5rem;
}

.grid-cell {
  border: 2px dashed #cbd5f5;
  border-radius: 0.75rem;
  padding: 0.75rem 0.5rem;
  background: #f8fafc;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all 0.2s ease;
}

.grid-cell[data-status='done'] {
  border-style: solid;
  border-color: #34d399;
  background: #d1fae5;
  color: #047857;
}

.grid-cell[data-status='done']::after {
  content: '✔';
  display: block;
  font-size: 1.5rem;
  margin-top: 0.25rem;
}

.primary {
  border: none;
  border-radius: 999px;
  padding: 0.75rem 1.5rem;
  background: #6366f1;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary:active {
  transform: scale(0.98);
}

form {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  font-weight: 600;
}

.field input {
  border-radius: 0.75rem;
  border: 1px solid #cbd5f5;
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

.helper {
  margin: 0.75rem 0 0;
  color: #475569;
}

.status {
  min-height: 1.5rem;
  margin-top: 0.75rem;
  font-weight: 600;
}

.status.error {
  color: #dc2626;
}

.status.success {
  color: #047857;
}

footer {
  margin-top: 2rem;
  color: #94a3b8;
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  body {
    padding: 1.25rem;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}