:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #dfe3e8;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --success-bg: #ecfdf3;
  --success-text: #166534;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
}

* {
  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);
}

.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.topbar nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.95rem;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 16px;
}

h2 {
  font-size: 1.1rem;
  margin: 32px 0 12px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  max-width: 480px;
}

.reading-form {
  max-width: 520px;
}

.field {
  margin-bottom: 16px;
}

.field-row {
  display: flex;
  gap: 16px;
}

.field-row .field {
  flex: 1;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea {
  resize: vertical;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 20px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  background: var(--accent-dark);
}

.link-btn {
  background: none;
  color: var(--error-text);
  padding: 0;
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: underline;
}

.link-btn:hover {
  background: none;
  color: #7f1d1d;
}

.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}

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

th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td:last-child {
  white-space: normal;
}

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

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

.empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.flash-list {
  max-width: 520px;
  margin-bottom: 16px;
}

.flash {
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.flash-success {
  background: var(--success-bg);
  color: var(--success-text);
}

.flash-error {
  background: var(--error-bg);
  color: var(--error-text);
}

.login-card {
  max-width: 360px;
  margin: 60px auto 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  text-align: center;
}

.login-card h1 {
  margin-bottom: 4px;
}

.login-card .subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.login-card form {
  text-align: left;
}

@media (max-width: 480px) {
  .field-row {
    flex-direction: column;
    gap: 0;
  }
}

.meter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin-bottom: 8px;
}

.meter-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.meter-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.meter-number {
  color: var(--muted);
  font-size: 0.8rem;
}

.meter-last, .meter-usage {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.meter-usage strong {
  color: var(--text);
}

.inline-form {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.inline-form input {
  flex: 1;
  min-width: 90px;
  padding: 8px 10px;
  font-size: 0.9rem;
}

.inline-form button {
  padding: 8px 14px;
  font-size: 0.85rem;
}

.apartment-card {
  max-width: 560px;
  margin-bottom: 16px;
}

.apartment-name {
  margin: 0 0 14px;
  font-size: 1.05rem;
}

.pending-row td {
  border-bottom: 1px solid var(--border);
}

.pending-note {
  color: var(--muted);
  font-size: 0.82rem;
  font-style: italic;
  white-space: normal;
}