:root {
  color-scheme: light;
  --ink: #18212f;
  --muted: #667085;
  --line: #d9e2ec;
  --paper: #f7fafc;
  --panel: #ffffff;
  --primary: #1b6b54;
  --primary-dark: #14503f;
  --danger: #a33a3a;
  --done: #e7f5ed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

a {
  color: var(--primary-dark);
  text-decoration: none;
}

h1,
h2 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.15rem;
}

input,
select,
button {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.65rem 0.8rem;
  font: inherit;
  background: #fff;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
}

button.primary,
.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

button.primary:hover,
.primary:hover {
  background: var(--primary-dark);
}

button.secondary {
  background: #eef4f7;
}

button.danger {
  background: #fff5f5;
  border-color: #f0b4b4;
  color: var(--danger);
}

label {
  display: grid;
  gap: 0.35rem;
  font-weight: 700;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--ink);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.topbar form {
  margin: 0;
}

.page {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.page-header {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.eyebrow {
  margin: 0 0 0.3rem;
  color: var(--muted);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.date-form,
.inline-form {
  display: grid;
  gap: 0.75rem;
}

.auth {
  width: min(440px, 100%);
  margin: 0 auto;
  min-height: 100vh;
  display: grid;
  align-content: center;
  gap: 1rem;
  padding: 1.25rem;
}

.auth form,
.panel,
.activity,
.edit-row {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

.auth form,
.panel,
.edit-row form {
  display: grid;
  gap: 0.9rem;
}

.muted,
.empty {
  color: var(--muted);
}

.alert {
  color: var(--danger);
  font-weight: 700;
}

.notice {
  display: grid;
  gap: 0.55rem;
  padding: 0.85rem;
  border-radius: 8px;
  background: var(--done);
  border: 1px solid #b5dec4;
}

.activity-list,
.admin-list,
.history {
  display: grid;
  gap: 0.8rem;
}

.activity {
  display: grid;
  gap: 0.85rem;
}

.activity.complete {
  background: var(--done);
}

.status {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.status.done {
  color: #276749;
  font-weight: 700;
}

.panel {
  margin-bottom: 1rem;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.history-item {
  display: grid;
  gap: 0.2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.history-item span {
  font-weight: 700;
}

.history-item small {
  color: var(--muted);
}

@media (min-width: 720px) {
  .topbar {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }

  .topbar form,
  .topbar button {
    width: auto;
  }

  .page-header {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .date-form,
  .inline-form {
    grid-template-columns: 1fr 1fr auto;
    align-items: end;
  }

  .activity {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .button-row {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
  }

  .button-row button {
    width: auto;
  }
}