:root {
  --bg: #0b1017;
  --bg-elev: #111a24;
  --bg-elev2: #16222f;
  --border: #243447;
  --fg: #e8eef4;
  --fg-dim: #9fb0c0;
  --fg-faint: #66788b;
  --accent: #35c4e0;
  --accent-dim: #1a5d6e;
  --ok: #3ecf8e;
  --warn: #e6b04a;
  --err: #e05a5a;
  --c-env: #4aa8ff;
  --c-adxl: #e6b04a;
  --c-h3lis: #b07ce8;
  --c-batt: #3ecf8e;
  --mono: "SFMono-Regular", "Consolas", "Liberation Mono", "Menlo", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.45;
}

[hidden] { display: none !important; }

/* ------------------------------- LOGIN -------------------------------- */
.login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.login-card {
  width: 100%;
  max-width: 340px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 24px;
}
.login-card h1 {
  font-size: 1.15rem;
  margin: 0 0 4px;
  font-weight: 600;
}
.login-sub {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 0.8rem;
  margin: 0 0 20px;
}
.login-card label {
  display: block;
  font-size: 0.78rem;
  color: var(--fg-dim);
  margin: 12px 0 4px;
}
.login-card .btn-primary { margin-top: 16px; min-height: 44px; width: 100%; }
.login-card input {
  width: 100%;
  padding: 9px 10px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: var(--mono);
}
.login-card input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.login-err {
  color: var(--err);
  font-size: 0.82rem;
  min-height: 1.2em;
  margin: 12px 0 0;
}

/* ------------------------------- APP LAYOUT --------------------------- */
.app-view { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; flex-direction: column; }
.brand-title { font-weight: 600; font-size: 1rem; }
.brand-sub { font-family: var(--mono); font-size: 0.7rem; color: var(--fg-faint); }
.topbar-status { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.lastupdate { font-family: var(--mono); font-size: 0.78rem; color: var(--fg-dim); }

.conn { font-family: var(--mono); font-size: 0.8rem; padding: 3px 8px; border-radius: 4px; border: 1px solid var(--border); }
.conn.ok { color: var(--ok); border-color: var(--ok); }
.conn.err { color: var(--err); border-color: var(--err); }
.conn.busy { color: var(--warn); border-color: var(--warn); }

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 14px;
  padding: 14px;
}

/* ------------------------------- SIDEBAR ------------------------------ */
.sidebar {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
}
.control-group label {
  display: block;
  font-size: 0.75rem;
  color: var(--fg-dim);
  margin-bottom: 4px;
}
.control-group select {
  width: 100%;
  padding: 8px 8px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.control-group select:focus,
.btn-primary:focus, .btn-ghost:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.toggle-label {
  display: flex !important;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem !important;
  color: var(--fg) !important;
  margin: 0 !important;
  cursor: pointer;
}
.toggle-label input { margin: 0; }

.btn-primary, .btn-ghost {
  padding: 9px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid var(--border);
}
.btn-primary {
  background: var(--accent-dim);
  color: var(--fg);
  border-color: var(--accent-dim);
}
.btn-primary:hover { background: var(--accent); color: #04121a; }
.btn-ghost {
  background: transparent;
  color: var(--fg-dim);
}
.btn-ghost:hover { color: var(--fg); border-color: var(--fg-dim); }

/* ------------------------------- CONTENT ------------------------------ */
.content { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.count-banner {
  background: var(--bg-elev2);
  border: 1px solid var(--warn);
  color: var(--warn);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.82rem;
  font-family: var(--mono);
  margin: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.card-label { font-size: 0.72rem; color: var(--fg-dim); text-transform: uppercase; letter-spacing: 0.04em; }
.card-value { font-family: var(--mono); font-size: 1.3rem; font-weight: 600; }

.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--fg-dim);
}
.badge-valid { color: var(--ok); border-color: var(--ok); }
.badge-error { color: var(--err); border-color: var(--err); }
.badge-timeout { color: var(--warn); border-color: var(--warn); }
.badge-absent { color: var(--fg-faint); border-color: var(--border); }

.charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.chart-block {
  margin: 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px 12px;
  position: relative;
}
.chart-block figcaption {
  font-size: 0.8rem;
  color: var(--fg-dim);
  margin-bottom: 8px;
}
.chart-block figcaption label {
  display: block;
  font-size: 0.72rem;
  color: var(--fg-dim);
  margin-bottom: 2px;
}
.chart-block figcaption select {
  width: 100%;
  padding: 4px 6px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.chart-block figcaption select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.chart-box { position: relative; width: 100%; height: 200px; }
.chart-svg { width: 100%; height: 100%; display: block; }

/* Chart SVG elements (colors via classes, not inline style) */
.chart-grid { stroke: var(--border); stroke-width: 1; }
.chart-tick { fill: var(--fg-faint); font-family: var(--mono); font-size: 10px; }
.chart-unit { fill: var(--fg-dim); font-family: var(--mono); font-size: 11px; }
.chart-empty { fill: var(--fg-faint); font-family: var(--sans); font-size: 13px; }
.chart-line { stroke-width: 1.8; fill: none; }
.chart-line.c-env { stroke: var(--c-env); }
.chart-line.c-adxl { stroke: var(--c-adxl); }
.chart-line.c-h3lis { stroke: var(--c-h3lis); }
.chart-line.c-batt { stroke: var(--c-batt); }
.chart-cross { stroke: var(--fg-dim); stroke-width: 1; stroke-dasharray: 3 3; }
.chart-dot.c-env { fill: var(--c-env); }
.chart-dot.c-adxl { fill: var(--c-adxl); }
.chart-dot.c-h3lis { fill: var(--c-h3lis); }
.chart-dot.c-batt { fill: var(--c-batt); }

.chart-tip {
  position: absolute;
  pointer-events: none;
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  z-index: 5;
}

/* ------------------------------- RESPONSIVE --------------------------- */
@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; }
  .charts { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  html { font-size: 14px; }
  .topbar { flex-direction: column; align-items: flex-start; }
  .card-value { font-size: 1.1rem; }
}

/* ------------------------------- MOTION ------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}