:root {
  --green-dark: #0f5132;
  --green-mid: #146c43;
  --green-bright: #198754;
  --green-faint: #edf7f1;
  --amber: #f59e0b;
  --bg: #f5f8f6;
  --surface: #ffffff;
  --surface2: #f3f7f4;
  --border: #b9d8c8;
  --border-strong: #8fbfa8;
  --text: #14231b;
  --text-dim: #345646;
  --text-mid: #1f4f39;
}

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

body {
  background: var(--bg);
  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: 0 8px 28px rgba(15, 118, 78, 0.08);
  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;
}

.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); }

.section-label {
  font-size: 16px;
  text-transform: uppercase;
  color: var(--text-mid);
  padding-left: 10px;
  border-left: 3px solid var(--green-bright);
  margin: 12px 0 8px;
  font-weight: 600;
}

.grid-top {
  display: grid;
  grid-template-columns: 200px 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}

.grid-environment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.cell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  text-align: center;
}

.cell-voltage { min-height: 110px; }
.cell-label { font-size: 13px; text-transform: uppercase; color: var(--text-dim); }
.cell-value { font-size: 28px; font-weight: 800; line-height: 1.1; }
.value-large { font-size: 32px; }
.cell-unit { font-size: 13px; color: var(--green-mid); text-transform: uppercase; }

.group-header {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--green-mid);
  text-align: center;
  padding: 7px 8px;
  background: var(--green-faint);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  font-weight: 700;
}

.group-cells { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }

.bottom-row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
}

.timestamp { flex: 1; font-size: 14px; color: var(--text-dim); text-transform: uppercase; }
.timestamp span { color: #0f5132; font-weight: 700; }

.alarm-group { display: flex; gap: 16px; align-items: center; }
.alarm-item { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.alarm-led { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--border-strong); background: #fef2f2; }
.alarm-label { font-size: 12px; text-transform: uppercase; color: var(--text-dim); text-align: center; line-height: 1.3; }

@media (max-width: 980px) {
  .grid-top { grid-template-columns: 1fr; }
  .grid-environment { grid-template-columns: 1fr; }
}