:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-alt: #f0f2f7;
  --text: #1a1d26;
  --text-secondary: #5f6577;
  --border: #e2e5ee;
  --primary: #3b6cef;
  --primary-light: #edf2ff;
  --danger: #e5484d;
  --danger-light: #fff0f0;
  --success: #30a46c;
  --success-light: #e9f9f1;
  --warning: #f5a623;
  --warning-light: #fff8eb;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow: 0 2px 8px rgba(0,0,0,.08);
  --font: 'DM Sans', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 18px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .brand {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.3px;
  color: var(--text);
  white-space: nowrap;
}
.header .brand span { color: var(--primary); }
.header .filters {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  flex: 1;
}
.header .actions {
  display: flex;
  gap: 10px;
  align-items: center;
  white-space: nowrap;
}
.dashboard {
  padding: 24px 28px;
  max-width: 1440px;
  margin: 0 auto;
}

/* ── Widgets grid ── */
.widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}
.widget {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  min-height: 120px;
  position: relative;
  transition: box-shadow .15s;
}
.widget:hover { box-shadow: var(--shadow); }
.widget.wide { grid-column: 1 / -1; }
.widget.half { grid-column: span 1; }
.widget h3 {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-secondary);
}
.widget .big-number {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.1;
}
.widget .sub { color: var(--text-secondary); font-size: 13px; margin-top: 4px; }

/* ── Kpi row ── */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
}
.kpi-card .label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .4px; color: var(--text-secondary); }
.kpi-card .value { font-size: 26px; font-weight: 700; letter-spacing: -0.5px; margin-top: 4px; }
.kpi-card .detail { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* ── Forms ── */
input, select, button {
  font-family: var(--font);
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .15s;
}
input:focus, select:focus { border-color: var(--primary); }
select { cursor: pointer; padding-right: 28px; }
button {
  cursor: pointer;
  font-weight: 600;
}
button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
button.primary:hover { background: #2f5dd4; }
button.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}
button.ghost:hover { background: var(--surface-alt); }
button.sm { padding: 5px 10px; font-size: 12px; }
button:disabled { opacity: .5; cursor: not-allowed; }

/* ── Tables ── */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  text-align: left;
  padding: 8px 10px;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .4px;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border);
}
tbody td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tbody tr:hover { background: var(--surface-alt); }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.badge.ok { background: var(--success-light); color: var(--success); }
.badge.warn { background: var(--warning-light); color: var(--warning); }
.badge.err { background: var(--danger-light); color: var(--danger); }

/* ── Bar (mini bar chart via CSS) ── */
.bar-wrap {
  display: flex;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--surface-alt);
  min-width: 80px;
}
.bar-wrap .bar-read { background: var(--primary); }
.bar-wrap .bar-write { background: var(--warning); }

/* ── Toast ── */
#globalToast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: all .25s;
  pointer-events: none;
  z-index: 9999;
}
#globalToast.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
#globalToast.ok { background: var(--success); color: #fff; }
#globalToast.err { background: var(--danger); color: #fff; }

/* ── Loading ── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 30px;
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Login page ── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 380px;
}
.login-card h1 {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 700;
}
.login-card .sub { color: var(--text-secondary); font-size: 13px; margin-bottom: 22px; }
.login-card label { display: block; font-size: 12px; font-weight: 600; color: var(--text-secondary); margin-bottom: 5px; }
.login-card input { width: 100%; margin-bottom: 16px; }
.login-card button { width: 100%; padding: 10px; }

/* ── Chart container ── */
.chart-container { position: relative; width: 100%; }
.chart-container canvas { width: 100% !important; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .header { padding: 12px 16px; flex-wrap: wrap; }
  .dashboard { padding: 16px; }
  .widgets { grid-template-columns: 1fr; }
  .kpi-row { grid-template-columns: 1fr 1fr; }
}