/* ==========================================================================
   Executive Finance Dashboard — styles
   Palette: off-white/dark-neutral base, confident teal accent, rose for
   negative/overdue, amber for partial/attention states.
   ========================================================================== */

:root {
  --bg: #f4f5f3;
  --surface: #ffffff;
  --surface-alt: #fafaf9;
  --border: #e4e5e1;
  --border-strong: #d8d9d4;
  --text: #16181c;
  --text-muted: #6b7076;
  --text-faint: #9a9ea4;

  --accent: #0f6e5c;
  --accent-strong: #0b5647;
  --accent-soft: #e3f1ed;

  --positive: #0f8a5f;
  --positive-soft: #e5f5ec;
  --negative: #c23a3a;
  --negative-soft: #fbeaea;
  --warning: #b7791f;
  --warning-soft: #fbf1de;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Helvetica, Arial, sans-serif;
  --font-num: 'Segoe UI', -apple-system, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

/* ---------------------------------------------------------------- topbar */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-left {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 15px;
  color: var(--text);
}

.brand-sub {
  font-size: 13px;
  color: var(--text-muted);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.date-filter {
  display: flex;
  align-items: center;
  gap: 6px;
}

.control {
  font-family: inherit;
  font-size: 13px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-alt);
  color: var(--text);
}

.control:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.date-sep { color: var(--text-faint); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary:hover { background: var(--accent-strong); }
.btn-primary:disabled { opacity: 0.7; cursor: default; }

.spinner {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.last-updated {
  font-size: 12px;
  color: var(--text-faint);
  white-space: nowrap;
}

/* ---------------------------------------------------------------- tabbar */

.tabbar {
  display: flex;
  gap: 4px;
  padding: 0 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab {
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------------------------------------------------------------- layout */

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 28px;
}

.panel-header {
  margin-bottom: 20px;
}

.panel-header h1 {
  font-size: 21px;
  margin: 0 0 4px;
  font-weight: 700;
}

.panel-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13.5px;
}

/* ---------------------------------------------------------------- kpis */

.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.kpi-row.kpi-3 { grid-template-columns: repeat(3, 1fr); }

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
}

.kpi-label {
  font-size: 12.5px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.kpi-value {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 6px;
}

.kpi-caption {
  font-size: 12.5px;
  color: var(--text-faint);
}

.trend {
  font-size: 12.5px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.trend.up { color: var(--positive); }
.trend.down { color: var(--negative); }

/* ---------------------------------------------------------------- cards/sections */

.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  margin-bottom: 20px;
}

.section-title {
  font-size: 14.5px;
  font-weight: 700;
  margin: 0 0 14px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.chart-wrap {
  position: relative;
  height: 280px;
}

/* ---------------------------------------------------------------- tables */

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

thead th {
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--text-faint);
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}

thead th.num, td.num { text-align: right; }

tbody td {
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
  color: var(--text);
}

tbody tr:last-child td { border-bottom: none; }

tbody tr.total-row td {
  font-weight: 700;
  border-top: 2px solid var(--border-strong);
  border-bottom: none;
  background: var(--surface-alt);
}

tbody tr.group-row td {
  font-weight: 700;
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding-top: 14px;
  border-bottom: 1px solid var(--border);
  background: none;
}

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

/* ---------------------------------------------------------------- status pills */

.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.pill-paid { background: var(--positive-soft); color: var(--positive); }
.pill-partial { background: var(--warning-soft); color: var(--warning); }
.pill-overdue { background: var(--negative-soft); color: var(--negative); }

/* ---------------------------------------------------------------- empty / error states */

.empty-state {
  padding: 24px 12px;
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
}

.error-banner {
  background: var(--negative-soft);
  color: var(--negative);
  border: 1px solid var(--negative);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 20px;
  font-size: 13px;
}

/* ---------------------------------------------------------------- skeleton */

.skeleton-wrap { padding: 4px 0; }

.skeleton-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.skel-card, .skel-table {
  background: linear-gradient(90deg, var(--surface-alt) 25%, var(--border) 37%, var(--surface-alt) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-lg);
}

.skel-card { height: 96px; }
.skel-table { height: 260px; }

@keyframes shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

/* ---------------------------------------------------------------- responsive */

@media (max-width: 1024px) {
  .kpi-row, .kpi-row.kpi-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .skeleton-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: stretch; }
  .topbar-right { justify-content: space-between; }
  .kpi-row, .kpi-row.kpi-3 { grid-template-columns: 1fr; }
  .app { padding: 16px; }
}