:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e5eb;
  --primary: #2f6f4f;
  --primary-dark: #24573e;
  --danger: #b3261e;
  --danger-bg: #fdecea;
  --warn: #92620a;
  --warn-bg: #fff4e0;
  --info-bg: #e8f0fe;
  --success-bg: #e6f4ea;
  --sidebar-bg: #1f2937;
  --sidebar-text: #d1d5db;
  --sidebar-active: #2f6f4f;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.45;
}

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

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  flex-shrink: 0;
}
.sidebar .brand { font-weight: 700; font-size: 1.1rem; color: #fff; padding: 0 18px 16px; }
.sidebar a { color: var(--sidebar-text); padding: 10px 18px; display: block; font-size: 0.95rem; }
.sidebar a:hover { background: rgba(255,255,255,0.06); text-decoration: none; }
.sidebar a.active { background: var(--sidebar-active); color: #fff; font-weight: 600; }
.sidebar-footer { margin-top: auto; padding: 12px 18px 0; border-top: 1px solid rgba(255,255,255,0.1); }
.sidebar-footer .who { color: #fff; font-size: 0.85rem; margin-bottom: 6px; }
.sidebar-footer a { padding: 4px 0; font-size: 0.85rem; }

.nav-toggle { display: none; }

.content { flex: 1; padding: 24px 28px; max-width: 1400px; }

.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; flex-wrap: wrap; gap: 10px; }
.page-header h1 { margin: 0; font-size: 1.5rem; }
.page-header .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 18px;
}
.form-narrow { max-width: 480px; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-bottom: 20px; }
.stat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat-card .stat-label { color: var(--muted); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
.stat-card .stat-value { font-size: 1.7rem; font-weight: 700; margin-top: 4px; }
.stat-card a { display: block; }
.stat-card a:hover { text-decoration: none; }

table { width: 100%; border-collapse: collapse; background: var(--card-bg); }
table th, table td { padding: 9px 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.92rem; }
table th { background: #fafafa; font-weight: 600; color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.02em; }
table tr:hover td { background: #fafbfc; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.table-wrap table { border: none; }

.btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}
.btn:hover { background: #f2f2f2; text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 5px 10px; font-size: 0.8rem; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

label { display: block; margin-bottom: 14px; font-weight: 600; font-size: 0.88rem; }
input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 400;
}
input[type=checkbox] { width: auto; display: inline-block; margin: 0 6px 0 0; }
.checkbox-row { display: flex; align-items: center; font-weight: 400; }
.field-error { color: var(--danger); font-size: 0.8rem; font-weight: 400; display: block; margin-top: 3px; }
.field-hint { color: var(--muted); font-size: 0.8rem; font-weight: 400; display: block; margin-top: 3px; }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 16px; }
.filter-bar .field { min-width: 140px; }
.filter-bar label { margin-bottom: 4px; }
.filter-presets { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.filter-presets a { padding: 5px 10px; border: 1px solid var(--border); border-radius: 14px; font-size: 0.8rem; }

.flashes { margin-bottom: 16px; }
.flash { padding: 11px 14px; border-radius: var(--radius); margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; }
.flash-success { background: var(--success-bg); color: #1e4620; }
.flash-danger { background: var(--danger-bg); color: var(--danger); }
.flash-info { background: var(--info-bg); color: #1a3c78; }
.flash-warning { background: var(--warn-bg); color: var(--warn); }
.flash-close { background: none; border: none; cursor: pointer; font-size: 1rem; color: inherit; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 12px; font-size: 0.76rem; font-weight: 600; }
.badge-paid { background: var(--success-bg); color: #1e4620; }
.badge-unpaid { background: var(--danger-bg); color: var(--danger); }
.badge-partial { background: var(--warn-bg); color: var(--warn); }
.badge-waived { background: #eee; color: #555; }
.badge-admin { background: var(--info-bg); color: #1a3c78; }
.badge-operator { background: #eee; color: #444; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-state h2 { color: var(--text); }

.auth-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.auth-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; width: 100%; max-width: 360px; }
.auth-card h1 { margin: 0 0 2px; font-size: 1.3rem; }
.muted { color: var(--muted); font-size: 0.88rem; margin-top: 0; margin-bottom: 20px; }

.warning-banner { background: var(--warn-bg); color: var(--warn); padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-weight: 600; }

.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal { background: #fff; border-radius: var(--radius); padding: 22px; max-width: 520px; width: 92%; max-height: 85vh; overflow-y: auto; }

.pagination { display: flex; gap: 6px; margin-top: 14px; }
.pagination a, .pagination span { padding: 6px 11px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.85rem; }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 18px; align-items: start; }
.settings-grid .card h2 { margin-top: 0; font-size: 1.1rem; }

@media (max-width: 800px) {
  .app-shell { flex-direction: column; }
  .nav-toggle { display: block; background: var(--sidebar-bg); color: #fff; border: none; padding: 12px 16px; text-align: left; font-size: 1rem; }
  .sidebar { display: none; width: 100%; }
  .sidebar.open { display: flex; }
  .content { padding: 16px; }
  .two-col { grid-template-columns: 1fr; }
}