:root {
  --bg: #f4f6f8;
  --bg-alt: #eef1f4;
  --panel: #ffffff;
  --panel-2: #f9fafb;
  --ink: #1b2026;
  --muted: #5b6775;
  --steel: #2f3a45;
  --accent: #4b6b7d;
  --accent-2: #8aa3b0;
  --warning: #b36b2c;
  --success: #2e7d5b;
  --danger: #9a3a3a;
  --grid: #dfe4e8;
  --shadow: 0 10px 30px rgba(19, 28, 38, 0.12);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --sidebar-w: 260px;
  --topbar-h: 64px;
  --transition: 200ms ease;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "IBM Plex Sans", "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 20%, #f9fbfd 0%, var(--bg) 35%, #e8edf2 100%);
  min-height: 100%;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.25;
  pointer-events: none;
  z-index: 0;
}

a { color: inherit; text-decoration: none; }

#app {
  position: relative;
  z-index: 1;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: linear-gradient(180deg, #1f2933 0%, #24303b 40%, #1e2730 100%);
  color: #e6edf3;
  padding: 24px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #3c5363 0%, #7b97a8 100%);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #f7f9fb;
}

.brand h1 {
  font-size: 18px;
  letter-spacing: 0.3px;
  margin: 0;
}

.nav-section {
  margin-bottom: 20px;
}

.nav-section h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: #95a6b2;
  margin: 16px 0 8px;
}

.nav-list {
  display: grid;
  gap: 6px;
}

.nav-link {
  padding: 10px 12px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: #d6e0e6;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.nav-badge {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
}

.main {
  padding: 24px 30px 50px;
}

.topbar {
  height: var(--topbar-h);
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 16px;
  z-index: 5;
}

.topbar .left,
.topbar .right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toggle-btn {
  display: none;
  border: none;
  background: var(--panel-2);
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  cursor: pointer;
}

.search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-2);
  padding: 8px 12px;
  border-radius: 999px;
  min-width: 220px;
}

.search input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
}

.pill {
  background: var(--panel-2);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
}

.page-header {
  margin: 28px 0 16px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-header h2 {
  margin: 0;
  font-size: 28px;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.card h4 {
  margin: 0 0 8px;
}

.card .metric {
  font-size: 28px;
  font-weight: 700;
}

.section {
  margin-top: 24px;
}

.section h3 {
  margin: 0 0 12px;
}

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

.table th,
.table td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid #e1e6ea;
  font-size: 14px;
}

.table th {
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.6px;
}

.btn {
  border: none;
  background: var(--steel);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  transition: transform var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
  background: #3b4854;
}

.btn.secondary {
  background: var(--panel-2);
  color: var(--ink);
}

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid #d2d9de;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.form-field {
  display: grid;
  gap: 6px;
}

.form-field label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
}

.form-field input,
.form-field select,
.form-field textarea {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #d5dde3;
  background: #fff;
  font-size: 14px;
}

.input-error {
  border-color: var(--danger) !important;
  background: #fff6f6 !important;
}

.form-message {
  margin-top: 10px;
}

.result-panel {
  background: var(--panel-2);
  border-radius: var(--radius);
  padding: 16px;
  display: grid;
  gap: 10px;
}

.result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
}

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

.breadcrumbs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--muted);
}

.breadcrumbs span::after {
  content: "/";
  margin: 0 6px;
}

.breadcrumbs span:last-child::after {
  content: "";
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 20, 25, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 20;
}

.modal.active {
  display: flex;
}

.modal-card {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 24px;
  width: min(520px, 92vw);
  box-shadow: var(--shadow);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.badge {
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 999px;
  background: #e0e7ec;
  color: var(--steel);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.empty {
  padding: 18px;
  border: 1px dashed #ccd6dc;
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  margin-top: 24px;
  padding: 14px 4px 0;
  color: var(--muted);
  font-size: 12px;
  text-align: right;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-w);
    transform: translateX(-100%);
    transition: transform var(--transition);
    z-index: 30;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .toggle-btn {
    display: inline-flex;
  }
  .main {
    padding: 18px;
  }
}

@media (max-width: 640px) {
  .topbar {
    flex-wrap: wrap;
    height: auto;
    padding: 12px;
    gap: 10px;
  }
  .search {
    min-width: 100%;
  }
  .topbar .right {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }
  .topbar .right .btn {
    width: 100%;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .card {
    overflow-x: auto;
  }
  .table {
    min-width: 560px;
  }
  .site-footer {
    text-align: center;
    padding-top: 18px;
  }
}