:root {
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --border: #dde1e6;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --busy: #dc2626;
  --free: #16a34a;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

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

.view {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  font-size: 1.4rem;
  margin: 0;
}

/* Login */

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

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-card h1 {
  margin-bottom: 8px;
  text-align: center;
}

/* App */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.header-actions {
  display: flex;
  gap: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  vertical-align: middle;
}

th {
  background: #f0f1f4;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr:last-child td {
  border-bottom: none;
}

.row-actions {
  display: flex;
  gap: 6px;
  justify-content: flex-end;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-grade {
  background: #e5e7eb;
  color: #374151;
}

.badge-busy {
  background: #fee2e2;
  color: var(--busy);
}

.badge-free {
  background: #dcfce7;
  color: var(--free);
}

/* Buttons */

button {
  font: inherit;
  border-radius: 6px;
  border: 1px solid transparent;
  padding: 8px 14px;
  cursor: pointer;
}

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

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

button.secondary {
  background: white;
  border-color: var(--border);
  color: var(--text);
}

button.secondary:hover {
  background: #f0f1f4;
}

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

button.danger:hover {
  background: #fee2e2;
  border-color: var(--danger);
}

button.small {
  padding: 5px 10px;
  font-size: 0.85rem;
}

/* Forms */

input, select, textarea {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 100%;
  background: white;
  color: var(--text);
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-top: 4px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.checkbox-label input {
  width: auto;
}

.time-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.error-text {
  color: var(--danger);
  font-size: 0.88rem;
  margin: 4px 0;
}

.empty-text {
  color: var(--muted);
  text-align: center;
  padding: 24px;
}

/* Modal */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 18, 25, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 10;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal h2 {
  margin-top: 0;
}

#event-form {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}