:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #dde1e6;
  --color-text: #1f2430;
  --color-text-muted: #667085;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-success-bg: #ecfdf3;
  --color-success-text: #067647;
  --color-warning-bg: #fffaeb;
  --color-warning-text: #b54708;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06);
  font-size: 15px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
}

h1,
h2,
h3 {
  margin: 0 0 0.5em;
  font-weight: 600;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar .brand {
  font-weight: 700;
  font-size: 1.1rem;
  white-space: nowrap;
}

.topbar nav {
  display: flex;
  gap: 0.25rem;
  flex: 1;
}

.topbar nav a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
}

.topbar nav a:hover {
  background: var(--color-bg);
}

.topbar nav a.active {
  color: var(--color-primary);
  background: #eaf1ff;
}

.topbar .user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.controls-row:last-child {
  margin-bottom: 0;
}

.tabs {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.tabs button {
  border: none;
  background: var(--color-surface);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-right: 1px solid var(--color-border);
}

.tabs button:last-child {
  border-right: none;
}

.tabs button.active {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
}

.period-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.period-nav .period-label {
  min-width: 12ch;
  text-align: center;
  font-weight: 600;
}

button,
.btn {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

button:hover {
  background: var(--color-bg);
}

button.icon-btn {
  padding: 0.3rem 0.5rem;
  line-height: 1;
}

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

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

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

button.danger:hover {
  background: #fef2f2;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.link-btn {
  border: none;
  background: none;
  padding: 0;
  color: var(--color-primary);
  text-decoration: underline;
}

input,
select,
textarea {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-text);
}

label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--color-border);
}

th {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr.clickable {
  cursor: pointer;
}

tbody tr.clickable:hover {
  background: var(--color-bg);
}

tr.edit-row td {
  background: #fafbfc;
}

.checkbox-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  max-width: 100%;
}

.checkbox-list label {
  flex-direction: row;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text);
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge.warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.badge.muted {
  background: var(--color-bg);
  color: var(--color-text-muted);
}

.notice {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.notice.error {
  background: #fef2f2;
  color: var(--color-danger);
  border: 1px solid #fecaca;
}

.notice.warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border: 1px solid #fde68a;
}

.notice.success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid #abefc6;
}

[hidden] {
  display: none !important;
}

.muted {
  color: var(--color-text-muted);
}

.section-tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.25rem;
}

.section-tabs button {
  border: none;
  border-radius: 0;
  border-bottom: 2px solid transparent;
  background: none;
  padding: 0.6rem 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.section-tabs button.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  width: 100%;
  max-width: 340px;
}

.login-card h1 {
  text-align: center;
  margin-bottom: 1.25rem;
}

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

.login-card button[type='submit'] {
  margin-top: 0.25rem;
}

.empty-state {
  color: var(--color-text-muted);
  text-align: center;
  padding: 2rem 0;
}

details.unassigned-panel summary {
  cursor: pointer;
  font-weight: 600;
  margin-bottom: 0.75rem;
}