:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --muted: #5f6f86;
  --text: #122033;
  --accent: #0f766e;
  --accent-soft: #d9f4ef;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --danger: #b91c1c;
  --danger-soft: #fee2e2;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --border: #d7e0ec;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.lms-shell {
  display: grid;
  grid-template-columns: 270px 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 22px 14px;
  background: linear-gradient(180deg, #0f766e 0%, #115e59 100%);
  color: #ecfdf5;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 4px 8px 24px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.16);
  display: grid;
  place-items: center;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.sidebar h1 {
  font-size: 18px;
  margin: 0;
}

.brand-sub {
  margin: 4px 0 0;
  font-size: 12px;
  opacity: 0.82;
}

.nav-btn {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: rgba(236, 253, 245, 0.82);
  padding: 11px 12px;
  border-radius: 10px;
  margin: 4px 0;
  cursor: pointer;
  font-size: 14px;
}

.nav-btn.active,
.nav-btn:hover {
  color: #042f2e;
  background: #ecfdf5;
  border-color: #99f6e4;
}

.content { padding: 24px; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.topbar h2 { margin: 0; font-size: 28px; }
.sub { color: var(--muted); margin: 6px 0 0; font-size: 13px; }

button, input, select {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 14px;
}

button {
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  border: none;
  font-weight: 600;
}

button.secondary { background: #64748b; }
button.linkish {
  background: transparent;
  color: var(--accent);
  border: none;
  padding: 0;
  font-weight: 600;
}

.view { display: none; }
.view.active { display: block; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

.kpis {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}

.kpi {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.kpi .label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.kpi .val {
  font-size: 26px;
  font-weight: 800;
  margin-top: 8px;
}

.kpi.warn .val { color: var(--warn); }
.kpi.danger .val { color: var(--danger); }

.toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 12px;
}

.toolbar input { min-width: 240px; }

.grid2 {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 14px;
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  text-align: left;
  border-bottom: 1px solid var(--border);
  padding: 11px 8px;
  font-size: 14px;
}

th {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tr.clickable { cursor: pointer; }
tr.clickable:hover { background: #f8fafc; }

.pill {
  display: inline-block;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.pill.active, .pill.due { background: var(--accent-soft); color: #115e59; }
.pill.paid, .pill.closed { background: var(--ok-soft); color: var(--ok); }
.pill.overdue { background: var(--danger-soft); color: var(--danger); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }

.muted { color: var(--muted); font-size: 12px; }
.money { font-variant-numeric: tabular-nums; font-weight: 700; }
.detail-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 14px;
}

.detail-head h3 { font-size: 22px; margin: 0 0 6px; }

.progress {
  height: 10px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 8px;
}

.progress > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #14b8a6, #0f766e);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stat-box {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.stat-box .label { color: var(--muted); font-size: 12px; }
.stat-box .val { font-size: 18px; font-weight: 700; margin-top: 4px; }

.empty {
  padding: 28px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .lms-shell { grid-template-columns: 1fr; }
  .sidebar { display: flex; flex-wrap: wrap; gap: 8px; }
  .brand { width: 100%; }
  .nav-btn { width: auto; }
  .kpis, .grid2, .grid3 { grid-template-columns: 1fr; }
}