:root {
  /* ── Color Tokens ─────────────────────────────────── */
  --bg-base:       #090c10;
  --bg-surface:    #0d1117;
  --bg-elevated:   #161b22;
  --bg-overlay:    #1c2128;
  --border:        #21262d;
  --border-muted:  #30363d;

  --text-primary:  #e6edf3;
  --text-secondary:#8b949e;
  --text-muted:    #484f58;

  --blue:          #58a6ff;
  --blue-muted:    #1f6feb;
  --green:         #3fb950;
  --green-muted:   #238636;
  --amber:         #d29922;
  --amber-muted:   #9e6a03;
  --red:           #f85149;
  --red-muted:     #da3633;
  --purple:        #bc8cff;
  --purple-muted:  #8957e5;
  --teal:          #39d353;
  --orange:        #f0883e;

  /* Category colors */
  --cat-referral:  #bc8cff;
  --cat-w2:        #58a6ff;
  --cat-c2c:       #3fb950;
  --cat-1099:      #f0883e;
  --cat-internal:  #39d353;

  /* ── Spacing ─────────────────────────────────────── */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;

  /* ── Typography ──────────────────────────────────── */
  --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* ── Radius ──────────────────────────────────────── */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  /* ── Shadows ─────────────────────────────────────── */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.6);

  /* ── Transitions ─────────────────────────────────── */
  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Layout Shell ─────────────────────────────────────── */
.app-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto 1fr;
  min-height: 100vh;
}

/* ── Topbar ───────────────────────────────────────────── */
.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  height: 60px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.topbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
  text-decoration: none;
}
.topbar-brand .logo-icon {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.topbar-meta {
  display: flex; align-items: center; gap: var(--space-md);
  font-size: 0.82rem; color: var(--text-secondary);
}
.topbar-time {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-muted);
}

/* ── Sidebar ──────────────────────────────────────────── */
.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  padding: var(--space-lg) 0;
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
}
.sidebar-section {
  padding: 0 var(--space-sm);
  margin-bottom: var(--space-lg);
}
.sidebar-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 var(--space-md);
  margin-bottom: var(--space-xs);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 9px var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}
.nav-link.active {
  background: rgba(88, 166, 255, 0.1);
  color: var(--blue);
}
.nav-link.active::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%; transform: translateY(-50%);
  width: 3px; height: 18px;
  background: var(--blue);
  border-radius: 0 2px 2px 0;
}
.nav-icon { font-size: 1rem; width: 20px; text-align: center; }
.nav-badge {
  margin-left: auto;
  background: var(--blue-muted);
  color: white;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 20px;
  min-width: 18px;
  text-align: center;
}

/* ── Main Content ─────────────────────────────────────── */
.main-content {
  background: var(--bg-base);
  overflow-x: hidden;
}
.page-header {
  padding: var(--space-xl) var(--space-2xl) var(--space-lg);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.page-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
}
.page-actions {
  display: flex; gap: var(--space-sm); margin-top: var(--space-md);
}
.page-body {
  padding: var(--space-xl) var(--space-2xl);
}

/* ── Stat Cards ───────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}
.stat-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent, var(--blue));
}
.stat-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}
.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
  line-height: 1;
}
.stat-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 6px;
}
.stat-icon {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: 1.5rem;
  opacity: 0.15;
}

/* ── Cards & Panels ───────────────────────────────────── */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
}
.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}
.card-body { padding: var(--space-lg); }

/* ── Data Tables ──────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-muted);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.data-table thead tr {
  background: var(--bg-overlay);
  border-bottom: 1px solid var(--border-muted);
}
.data-table th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  white-space: nowrap;
}
.data-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: middle;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td {
  background: rgba(255,255,255,0.02);
  color: var(--text-primary);
}
.data-table td strong { color: var(--text-primary); }

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-muted));
  color: white;
  box-shadow: 0 2px 8px rgba(31,111,235,0.35);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 16px rgba(31,111,235,0.5);
  transform: translateY(-1px);
}
.btn-success {
  background: linear-gradient(135deg, var(--green), var(--green-muted));
  color: white;
  box-shadow: 0 2px 8px rgba(35,134,54,0.35);
}
.btn-success:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-danger {
  background: linear-gradient(135deg, var(--red), var(--red-muted));
  color: white;
}
.btn-danger:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-muted);
}
.btn-ghost:hover {
  background: var(--bg-overlay);
  color: var(--text-primary);
}
.btn-sm { padding: 5px 10px; font-size: 0.78rem; }
.btn-icon { padding: 6px 8px; }

/* ── Badges / Tags ────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-active   { background: rgba(63,185,80,0.15); color: var(--green); border: 1px solid rgba(63,185,80,0.3); }
.badge-ended    { background: rgba(248,81,73,0.15);  color: var(--red);   border: 1px solid rgba(248,81,73,0.3); }
.badge-on_hold  { background: rgba(210,153,34,0.15); color: var(--amber); border: 1px solid rgba(210,153,34,0.3); }
.badge-pending  { background: rgba(210,153,34,0.15); color: var(--amber); border: 1px solid rgba(210,153,34,0.3); }
.badge-approved { background: rgba(63,185,80,0.15);  color: var(--green); border: 1px solid rgba(63,185,80,0.3); }
.badge-rejected { background: rgba(248,81,73,0.15);  color: var(--red);   border: 1px solid rgba(248,81,73,0.3); }

/* Category badges */
.cat-Referral      { background: rgba(188,140,255,0.12); color: var(--cat-referral); border: 1px solid rgba(188,140,255,0.25); }
.cat-W2            { background: rgba(88,166,255,0.12);  color: var(--cat-w2);       border: 1px solid rgba(88,166,255,0.25); }
.cat-C2C           { background: rgba(63,185,80,0.12);   color: var(--cat-c2c);      border: 1px solid rgba(63,185,80,0.25); }
.cat-1099          { background: rgba(240,136,62,0.12);  color: var(--cat-1099);     border: 1px solid rgba(240,136,62,0.25); }
.cat-Internal\ C2C { background: rgba(57,211,83,0.12);   color: var(--cat-internal); border: 1px solid rgba(57,211,83,0.25); }

/* ── Forms ────────────────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}
.required::after { content: ' *'; color: var(--red); }
input, select, textarea {
  background: var(--bg-overlay);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 9px 12px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(88,166,255,0.15);
}
select option { background: var(--bg-overlay); }
textarea { resize: vertical; min-height: 80px; }
.input-prefix {
  position: relative;
}
.input-prefix span {
  position: absolute;
  left: 10px;
  top: 50%; transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.875rem;
  pointer-events: none;
}
.input-prefix input { padding-left: 22px; }

/* ── Modal ────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-backdrop.open {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition);
}
.modal-backdrop.open .modal { transform: scale(1) translateY(0); }
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-elevated);
  z-index: 1;
}
.modal-title { font-size: 1.05rem; font-weight: 700; }
.modal-close {
  background: none; border: none;
  color: var(--text-muted); font-size: 1.2rem;
  cursor: pointer; padding: 4px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.modal-close:hover { color: var(--text-primary); background: var(--bg-overlay); }
.modal-body { padding: var(--space-xl); }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl) var(--space-xl);
}

/* ── Search & Filters ─────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  flex-wrap: wrap;
}
.search-box {
  position: relative;
  flex: 1;
  min-width: 220px;
}
.search-box .search-icon {
  position: absolute;
  left: 10px; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); font-size: 0.9rem;
  pointer-events: none;
}
.search-box input {
  padding-left: 32px;
  background: var(--bg-overlay);
}
.filter-select { width: auto; min-width: 130px; }

/* ── Alert / Toast ────────────────────────────────────── */
.alert {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
}
.alert-success { background: rgba(35,134,54,0.15); border: 1px solid var(--green-muted); color: var(--green); }
.alert-error   { background: rgba(218,54,51,0.15);  border: 1px solid var(--red-muted);   color: var(--red); }
.alert-info    { background: rgba(31,111,235,0.15); border: 1px solid var(--blue-muted);  color: var(--blue); }
.alert-warning { background: rgba(158,106,3,0.15);  border: 1px solid var(--amber-muted); color: var(--amber); }

#toast-container {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  min-width: 280px;
  animation: slideIn 0.25s ease-out;
}
.toast.success { border-left: 3px solid var(--green); }
.toast.error   { border-left: 3px solid var(--red); }
.toast.info    { border-left: 3px solid var(--blue); }
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ── Empty State ──────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
  text-align: center;
  gap: var(--space-md);
}
.empty-state .empty-icon { font-size: 3rem; opacity: 0.4; }
.empty-state h3 { color: var(--text-secondary); font-size: 1rem; }
.empty-state p { font-size: 0.875rem; max-width: 360px; line-height: 1.6; }

/* ── Charts placeholder ───────────────────────────────── */
.chart-container {
  position: relative;
  background: var(--bg-overlay);
  border-radius: var(--radius-md);
  overflow: hidden;
}

/* ── Progress bars ────────────────────────────────────── */
.progress-bar {
  height: 4px;
  background: var(--bg-overlay);
  border-radius: 2px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--purple));
  transition: width 0.5s ease;
}

/* ── Rate display ─────────────────────────────────────── */
.rate-cell {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
}
.rate-bill   { color: var(--green); }
.rate-pay    { color: var(--blue); }
.rate-partner{ color: var(--purple); }
.rate-margin { color: var(--amber); }

/* ── Tabs ─────────────────────────────────────────────── */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-xl);
  gap: 2px;
}
.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: -1px;
}
.tab-btn:hover  { color: var(--text-primary); }
.tab-btn.active { color: var(--blue); border-bottom-color: var(--blue); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Upload Zone ──────────────────────────────────────── */
.upload-zone {
  border: 2px dashed var(--border-muted);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-muted);
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--blue);
  background: rgba(88,166,255,0.05);
  color: var(--blue);
}
.upload-icon { font-size: 2.5rem; margin-bottom: var(--space-sm); }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .page-body { padding: var(--space-lg); }
}
@media (max-width: 600px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .form-grid  { grid-template-columns: 1fr; }
  .page-body  { padding: var(--space-md); }
}

/* ── Scrollbar Styling ────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Utility ──────────────────────────────────────────── */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.mt-md { margin-top: var(--space-md); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.font-mono { font-family: var(--font-mono); }
.w-full { width: 100%; }
.hidden { display: none !important; }