:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #f0f3f6;
  --text: #1b2430;
  --muted: #637083;
  --border: #dde3ea;
  --accent: #f59e0b;
  --accent-strong: #d97706;
  --accent-text: #1b1300;
  --primary: #2563eb;
  --good: #16a34a;
  --mid: #ca8a04;
  --low: #94a3b8;
  --danger: #dc2626;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141a;
    --surface: #171e26;
    --surface-2: #1f2832;
    --text: #e6ebf1;
    --muted: #93a1b3;
    --border: #2b3643;
    --accent: #fbbf24;
    --accent-strong: #f59e0b;
    --primary: #60a5fa;
    --good: #4ade80;
    --mid: #facc15;
    --low: #64748b;
    --danger: #f87171;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--primary); }

.site-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.brand { display: flex; align-items: center; gap: 14px; max-width: 1400px; margin: 0 auto; }
.brand .logo { font-size: 34px; }
.brand h1 { margin: 0; font-size: 22px; }
.brand p { margin: 0; color: var(--muted); font-size: 14px; }

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 20px;
  max-width: 1400px;
  margin: 20px auto;
  padding: 0 20px;
  align-items: start;
}
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; padding: 0 12px; }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}
.results { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.results .panel h3 { margin: 0 0 10px; font-size: 16px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.panel-head h3 { margin: 0 0 10px; }

.settings h2 {
  font-size: 15px;
  margin: 22px 0 10px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.settings h2:first-child { margin-top: 0; padding-top: 0; border-top: 0; }

label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); margin-bottom: 10px; }

input, select, button { font: inherit; }
input[type=text], input[type=number], select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
input[type=range] { width: 100%; accent-color: var(--accent-strong); }

button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  white-space: nowrap;
}
button:hover { border-color: var(--muted); }
button:disabled { opacity: .5; cursor: default; }
button.primary {
  background: var(--accent);
  border-color: var(--accent-strong);
  color: var(--accent-text);
  font-weight: 600;
  padding: 11px 14px;
  margin-top: 6px;
}
button.primary:hover { background: var(--accent-strong); }
button.ghost { background: transparent; }
button.full { width: 100%; }
.small-btn { padding: 4px 10px; font-size: 13px; }

.row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.row input { flex: 1; min-width: 0; }
.row.small { font-size: 13px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 10px; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0 8px; align-items: end; }
.muted { color: var(--muted); }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 10px; }
.warn { color: var(--danger); }

.loc-results { display: flex; flex-direction: column; gap: 4px; margin-bottom: 6px; }
.loc-results button { text-align: left; font-size: 13px; white-space: normal; }

#map {
  height: 230px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 6px 0 10px;
  z-index: 0;
}

.array-card {
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 10px;
  padding: 10px 12px 6px;
  margin-bottom: 10px;
}
.array-card input[type=number] { background: var(--surface); }
.array-head { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.array-head .a-name {
  flex: 1;
  font-weight: 600;
  background: transparent;
  border-color: transparent;
  padding: 4px 6px;
}
.array-head .a-name:hover { border-color: var(--border); }
.icon-btn { padding: 2px 8px; background: transparent; border-color: transparent; color: var(--muted); }
.array-body { display: grid; grid-template-columns: 1fr 64px; gap: 10px; align-items: start; }
.compass { width: 64px; height: 64px; margin-top: 4px; }
.compass .ring { fill: var(--surface); stroke: var(--border); }
.compass text { fill: var(--muted); font-size: 11px; text-anchor: middle; dominant-baseline: middle; }
.compass .needle { fill: var(--accent-strong); }
.dir-picker { display: grid; grid-template-columns: repeat(8, 1fr); gap: 3px; margin: -4px 0 8px; }
.dir-picker button { padding: 3px 0; font-size: 12px; }
.dir-picker button.on { background: var(--accent); border-color: var(--accent-strong); color: var(--accent-text); }
.tilt-row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); margin-bottom: 6px; }

.msg { padding: 12px 16px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); }
.msg.error { border-color: var(--danger); color: var(--danger); }
.msg.loading::before {
  content: "";
  display: inline-block;
  width: 14px; height: 14px;
  margin-right: 8px;
  vertical-align: -2px;
  border: 2px solid var(--border);
  border-top-color: var(--accent-strong);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.kpi {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 14px;
}
.kpi .label { color: var(--muted); font-size: 13px; }
.kpi .value { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.kpi .value small { font-size: 14px; font-weight: 500; color: var(--muted); margin-left: 3px; }
.kpi .sub { color: var(--muted); font-size: 12px; }
.kpi.hero { border-color: var(--accent-strong); }

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

.table-panel { overflow-x: auto; padding: 6px 8px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 12px; color: var(--muted); font-weight: 600; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: var(--surface-2); }
tbody tr.selected { background: var(--surface-2); box-shadow: inset 3px 0 0 var(--accent-strong); }
tbody tr:last-child td { border-bottom: 0; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
td.energy { font-weight: 700; }
.bar { display: inline-block; height: 6px; border-radius: 3px; background: var(--accent); vertical-align: middle; margin-right: 8px; }
.badge { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 99px; border: 1px solid currentColor; }
.badge.r-high { color: var(--good); }
.badge.r-mid { color: var(--mid); }
.badge.r-low { color: var(--low); }

.method summary { cursor: pointer; font-weight: 600; }
.method ul { margin: 10px 0 0; padding-left: 20px; color: var(--muted); font-size: 14px; }
.method li { margin-bottom: 4px; }

.site-footer { text-align: center; color: var(--muted); font-size: 12px; padding: 10px 16px 24px; }