:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #141414;
  color: #f5f5f5;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.4;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem;
}

h1, h2, p {
  margin: 0;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.125rem;
}

form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

label {
  flex: 1 1 100%;
}

input {
  flex: 1 1 10rem;
  min-width: 0;
}

input, button {
  font: inherit;
  color: inherit;
  background: #2a2a2a;
  border: 1px solid #3a3a3a;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
}

button {
  cursor: pointer;
}

#error {
  min-height: 1.4em;
  margin: 0.75rem 0;
  color: #ffb4b4;
}

#empty {
  margin-bottom: 1rem;
}

#habits {
  list-style: none;
  margin: 0;
  padding: 0;
}

.card {
  background: #1e1e1e;
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.streak {
  margin: 0.35rem 0 0.75rem;
}

.streak span {
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button[aria-pressed="true"] {
  background: #e8ff47;
  color: #141414;
  border-color: #e8ff47;
}

.days {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 0.75rem;
}

.cell {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  padding: 0;
  background: #2a2a2a;
  border: 2px solid transparent;
}

.cell.filled {
  background: #e8ff47;
}

.cell.today {
  border-color: #f5f5f5;
}

:focus-visible {
  outline: 2px solid #e8ff47;
  outline-offset: 2px;
}

@media (max-width: 390px) {
  main {
    padding: 0.75rem;
  }

  .cell {
    width: 22px;
    height: 22px;
    flex-basis: 22px;
  }
}