:root {
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #fbbf24;
  --accent-dark: #d97706;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 1.5rem 1rem 1rem;
}

header h1 {
  font-size: 2rem;
  color: var(--accent);
}

header p {
  color: var(--muted);
  margin-top: 0.25rem;
}

#lang-btn {
  position: absolute;
  top: 1rem;
  inset-inline-end: 1rem;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  font-size: 0.9rem;
}

nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 0.55rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
}

.tab-btn.active {
  background: var(--accent);
  color: #111827;
  border-color: var(--accent);
  font-weight: 600;
}

main {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

label { display: block; margin-bottom: 0.4rem; color: var(--muted); }

input[type="number"], input[type="text"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.6rem 0.8rem;
  font-size: 1rem;
}

.radio-row {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.radio-row label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  cursor: pointer;
}

button.primary, .calc-btn {
  background: var(--accent);
  color: #111827;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  cursor: pointer;
  width: 100%;
  margin-top: 1rem;
}

button.primary:hover, .calc-btn:hover { background: var(--accent-dark); }

.result-box {
  background: var(--bg);
  border: 1px dashed var(--accent);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 1rem;
  text-align: center;
}

.result-box .total-label { color: var(--muted); }

.result-box strong {
  display: block;
  font-size: 1.6rem;
  color: var(--accent);
  margin-top: 0.3rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

th, td {
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0.4rem;
  text-align: start;
}

th { color: var(--accent); font-weight: 600; }

td input { padding: 0.35rem 0.5rem; }

.tier-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.6rem;
}

.tier-card strong { color: var(--accent); }

.note { color: var(--muted); font-size: 0.9rem; margin-top: 0.75rem; }

.appl-summary {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.appl-summary div {
  flex: 1;
  min-width: 140px;
  text-align: center;
}

.appl-summary span { color: var(--muted); display: block; }
.appl-summary strong { font-size: 1.3rem; color: var(--accent); }

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.chart { margin: 0.75rem 0; }

.bar-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.bar-label { white-space: nowrap; font-size: 0.9rem; }
.bar-label small { color: var(--muted); }

.bar-track {
  background: var(--bg);
  border-radius: 6px;
  height: 22px;
  overflow: hidden;
}

.bar-fill {
  background: var(--accent);
  height: 100%;
  border-radius: 6px;
}

.bar-row.best .bar-fill { background: #34d399; }
.bar-row.best .bar-value { color: #34d399; }

.bar-value { font-variant-numeric: tabular-nums; font-weight: 600; }

#cmp-cheapest, #cmp-payback { margin-top: 0.75rem; }
#cmp-cheapest strong { color: #34d399; }

.solar-grid { margin-top: 1rem; }

#sol-region, #sol-batt, #sol-panel {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.6rem 0.8rem;
  font-size: 1rem;
}

.ot-buttons { display: flex; gap: 0.75rem; margin-top: 1rem; }

.ot-buttons button {
  flex: 1;
  border: none;
  border-radius: 10px;
  padding: 0.8rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}

.ot-on { background: #059669; color: #fff; }
.ot-off { background: #dc2626; color: #fff; }
.ot-on:hover { background: #047857; }
.ot-off:hover { background: #b91c1c; }

.report {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.5rem;
}

.report .dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.report.on .dot { background: #34d399; box-shadow: 0 0 6px #34d399; }
.report.off .dot { background: #f87171; box-shadow: 0 0 6px #f87171; }

.report small {
  display: block;
  color: var(--muted);
}

.report .status { margin-inline-start: auto; font-size: 1.2rem; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 480px) {
  table { font-size: 0.8rem; }
  header h1 { font-size: 1.6rem; }
  .grid2 { grid-template-columns: 1fr; }
}