:root {
  --green-dark: #0f5132;
  --green-mid: #146c43;
  --green-bright: #198754;
  --green-faint: #edf7f1;
  --bg: #eef5f1;
  --surface: #ffffff;
  --surface2: #f4faf6;
  --border: #b9d8c8;
  --border-strong: #8fbfa8;
  --text: #14231b;
  --text-dim: #345646;
  --text-mid: #1f4f39;
  --shadow-soft: 0 10px 28px rgba(11, 70, 43, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body { background: radial-gradient(circle at top right, #dff2e8, var(--bg) 45%); font-family: "Inter", Arial, sans-serif; color: var(--text); min-height: 100vh; padding: 24px; }

.wrapper { max-width: 1120px; margin: 0 auto; }

.header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  margin-bottom: 12px;
}

.logo-container {
  width: 180px;
  display: flex;
  align-items: center;
}

.site-logo {
  max-width: 80px;
  height: auto;
}

.logo-text { flex: 1; text-align: center; }
.logo-title { font-size: 20px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--green-dark); }
.logo-desc { font-size: 20px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--green-dark); margin-top: 4px; }

.mode-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 16px;
  min-width: 180px;
}

.mode-title { font-size: 13px; letter-spacing: 1px; text-transform: uppercase; color: var(--text-dim); text-align: center; }
.mode-toggle { display: flex; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; }
.mode-btn { flex: 1; border: none; background: var(--surface); padding: 6px 8px; cursor: pointer; }
.mode-btn.active { background: var(--green-bright); color: #fff; }
.mode-on-row { display: flex; align-items: center; gap: 8px; }
.mode-led {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #d1fae5;
  border: 1.5px solid var(--border-strong);
}
.mode-led.on {
  background: var(--green-bright);
  border-color: var(--green-dark);
  box-shadow: 0 0 6px rgba(34, 192, 105, 0.6);
}
.btn-on {
  flex: 1;
  border: 1.5px solid var(--green-bright);
  background: transparent;
  color: var(--green-dark);
  border-radius: 6px;
  padding: 6px 0;
  cursor: pointer;
}
.btn-on.on { background: var(--green-bright); color: #fff; border-color: var(--green-dark); }

.nav-tabs {
  display: flex;
  margin-bottom: 12px;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.nav-tab {
  flex: 1;
  padding: 10px;
  text-align: center;
  text-decoration: none;
  color: #2f4f40;
  text-transform: uppercase;
  border-right: 1px solid var(--border);
}

.nav-tab:last-child { border-right: none; }
.nav-tab.active { background: #e3f3ea; color: #0f5132; font-weight: 700; border-bottom: 3px solid var(--green-bright); }

.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 0;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
  padding: 14px;
}

.chart-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 10px;
}

.chart-card-header h2 { font-size: 15px; color: var(--text-mid); text-transform: uppercase; }

.legend { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  display: inline-block;
}

.dot.voltage { background: #198754; }
.dot.ia { background: #0ea5e9; }
.dot.ib { background: #f59e0b; }
.dot.ic { background: #8b5cf6; }
.dot.pa { background: #16a34a; }
.dot.pb { background: #f97316; }
.dot.pc { background: #2563eb; }
.dot.ptotal { background: #ef4444; }
.dot.co2 { background: #059669; }

canvas {
  width: 100%;
  height: 240px;
  display: block;
  background: #fbfefc;
  border: 1px solid #d7e9de;
  border-radius: 12px;
}

@media (max-width: 980px) {
  .header { flex-wrap: wrap; }
  .charts-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { padding: 14px; }
  .logo-title { font-size: 20px; }
  .logo-desc { font-size: 12px; }
}