:root {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --line: #d8e0ea;
  --text: #18253a;
  --muted: #5c6b80;
  --brand: #0d3b66;
}

html, body {
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.app-shell {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: linear-gradient(180deg, #0a2647 0%, #12355b 100%);
  color: #eef4ff;
  padding: 20px 16px;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 22px;
}

.nav-stack a {
  display: block;
  color: #e9f0ff;
  text-decoration: none;
  padding: 9px 12px;
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: .92rem;
}

.nav-stack a:hover,
.nav-stack a.active {
  background: rgba(255, 255, 255, 0.14);
}

.main {
  padding: 24px;
}

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

.page-title {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 4px 16px rgba(8, 20, 41, 0.05);
}

.stat .label { color: var(--muted); font-size: .85rem; }
.stat .value { font-size: 1.3rem; font-weight: 700; margin-top: 4px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(8, 20, 41, 0.05);
}

.panel-head {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}

.panel-body {
  padding: 14px;
}

.table th {
  font-size: .8rem;
  text-transform: uppercase;
  color: var(--muted);
}

.inline-form {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.inline-form.wide {
  grid-template-columns: repeat(8, minmax(0, 1fr));
}

@media (max-width: 1200px) {
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .inline-form, .inline-form.wide { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
}