:root {
  --bg: #f5f7f9;
  --panel: #ffffff;
  --ink: #1e272e;
  --muted: #6a757f;
  --line: #dce3e8;
  --primary: #146c63;
  --primary-dark: #0f504a;
  --accent: #b84f2d;
  --success-bg: #e6f5ec;
  --success-ink: #22683a;
  --warn-bg: #fff4dc;
  --warn-ink: #835a0b;
  --danger-bg: #fdecea;
  --danger-ink: #a32922;
  --shadow: 0 14px 32px rgba(26, 39, 52, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
}

a { color: inherit; }

button, input, select, textarea {
  font: inherit;
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}

.sidebar {
  background: #17262d;
  color: #fff;
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.brand strong {
  display: block;
  font-size: 22px;
}

.brand span,
.profile {
  color: #b9c6ca;
  font-size: 13px;
}

nav {
  display: grid;
  gap: 8px;
}

nav a {
  text-decoration: none;
  border-radius: 8px;
  padding: 12px 14px;
  color: #dbe5e8;
}

nav a:hover,
nav a.active {
  background: rgba(255, 255, 255, .12);
  color: #fff;
}

.profile {
  margin-top: auto;
  display: grid;
  gap: 8px;
}

.profile a {
  color: #fff;
}

.main {
  padding: 24px;
  overflow: auto;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
}

.login-card {
  width: min(440px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 26px;
}

.login-card h1 {
  margin: 0 0 8px;
}

.login-card p {
  margin: 0 0 20px;
  color: var(--muted);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 0;
  font-size: 28px;
}

.topbar p {
  margin: 6px 0 0;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.card,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.card {
  padding: 16px;
}

.card span {
  color: var(--muted);
  font-size: 13px;
}

.card strong {
  display: block;
  margin-top: 8px;
  font-size: 26px;
}

.panel {
  padding: 18px;
  margin-bottom: 18px;
}

.panel h2 {
  font-size: 18px;
  margin: 0 0 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 40px;
  padding: 9px 10px;
  background: #fff;
  color: var(--ink);
}

textarea {
  min-height: 86px;
  resize: vertical;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  min-height: 40px;
  padding: 9px 14px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap;
}

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

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

.btn.danger {
  color: var(--danger-ink);
}

.btn.whatsapp {
  background: #e6f7ef;
  border-color: #bdebd3;
  color: #146c43;
}

.filters {
  display: grid;
  grid-template-columns: 1fr 180px 180px;
  gap: 10px;
  margin-bottom: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 12px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.table-wrap {
  overflow-x: auto;
}

.badge {
  display: inline-block;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  background: #eaf2f1;
  color: var(--primary-dark);
}

.badge.warn {
  background: var(--warn-bg);
  color: var(--warn-ink);
}

.badge.success {
  background: var(--success-bg);
  color: var(--success-ink);
}

.badge.danger {
  background: var(--danger-bg);
  color: var(--danger-ink);
}

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

.empty {
  color: var(--muted);
  padding: 22px;
  text-align: center;
}

.flash {
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 16px;
  background: var(--success-bg);
  color: var(--success-ink);
}

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

.due {
  background: #fff9ea;
}

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

.report-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (max-width: 980px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  nav { grid-template-columns: repeat(3, 1fr); }
  .cards, .grid, .grid-3, .report-list, .filters { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .main { padding: 16px; }
  .topbar { flex-direction: column; }
  nav { grid-template-columns: repeat(2, 1fr); }
  table { min-width: 820px; }
}