:root {
    --bg:       #060e18;
    --bg2:      #0a1828;
    --bg3:      #1a2d40;
    --bg4:      #0f2744;
    --border:   #1e3a5f;
    --border2:  #334155;
    --text:     #f1f5f9;
    --text2:    #94a3b8;
    --text3:    #475569;
    --blue:     #3b82f6;
    --blue2:    #60a5fa;
    --yellow:   #f59e0b;
    --green:    #22c55e;
    --purple:   #9b59b6;
    --orange:   #f97316;
    --red:      #e74c3c;
    --cyan:     #1abc9c;
    --accent:   #2563eb;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Syne', sans-serif;
    font-size: 13px;
    min-height: 100vh;
  }
  /* ── Header ── */
  #header {
    background: linear-gradient(135deg, #0c1e35, #0f2744);
    padding: 12px 20px;
    border-bottom: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  #header h1 { font-size: 17px; font-weight: 800; letter-spacing: -0.3px; }
  #header .sub { color: var(--text3); font-size: 11px; margin-top: 2px; }
  #header .kpi { text-align: right; }
  #header .kpi .val { color: var(--yellow); font-size: 22px; font-weight: 800; font-family: 'Space Mono', monospace; }
  #header .kpi .sub2 { color: var(--text3); font-size: 11px; }
  /* ── Layout ── */
  #layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: calc(100vh - 62px);
  }
  /* ── Sidebar ── */
  #sidebar {
    background: var(--bg2);
    padding: 12px;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    max-height: calc(100vh - 62px);
  }
  /* ── Sections ── */
  .sec {
    background: var(--bg3);
    border-radius: 8px;
    padding: 11px;
    margin-bottom: 10px;
  }
  .sec-title {
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 9px;
  }
  /* ── Slider ── */
  .sl-row { margin-bottom: 9px; }
  .sl-label { display: flex; justify-content: space-between; margin-bottom: 3px; }
  .sl-label span:first-child { color: var(--text3); font-size: 11px; }
  .sl-label .sl-val { font-size: 12px; font-weight: 700; font-family: 'Space Mono', monospace; }
  input[type=range] { width: 100%; height: 4px; cursor: pointer; border-radius: 2px; }
  /* ── Number stepper ── */
  .num-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 7px; }
  .num-row label { color: var(--text3); font-size: 11px; }
  .num-ctrl { display: flex; align-items: center; gap: 4px; }
  .num-btn {
    width: 22px; height: 22px;
    background: var(--bg4); border: 1px solid var(--border2);
    color: var(--text2); border-radius: 4px; cursor: pointer;
    font-size: 14px; line-height: 1; display: flex; align-items: center; justify-content: center;
  }
  .num-btn:hover { background: var(--border2); }
  .num-val { color: var(--text); font-size: 13px; font-weight: 800; font-family: 'Space Mono', monospace; min-width: 30px; text-align: center; }
  /* ── Tabs ── */
  #tabs { display: flex; gap: 5px; margin-bottom: 12px; flex-wrap: wrap; }
  .tab-btn {
    padding: 6px 14px; border-radius: 6px; border: none; cursor: pointer;
    font-weight: 700; font-size: 12px; font-family: 'Syne', sans-serif;
    background: var(--bg4); color: var(--text3); transition: all .15s;
  }
  .tab-btn.active { background: var(--accent); color: white; }
  .tab-btn:hover:not(.active) { background: var(--border2); }
  /* ── Main panel ── */
  #main { padding: 14px; overflow-y: auto; }
  .panel-box {
    background: var(--bg2);
    border-radius: 10px;
    padding: 14px;
    border: 1px solid var(--border);
  }
  /* ── Bar chart ── */
  .barchart { }
  .barchart-title { color: var(--text2); font-size: 13px; margin-bottom: 8px; font-weight: 700; }
  .barchart-bars { display: flex; align-items: flex-end; gap: 3px; height: 160px; }
  .barchart-col { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; justify-content: flex-end; }
  .barchart-lbl-top { font-size: 9px; font-family: 'Space Mono', monospace; margin-bottom: 2px; }
  .barchart-bar { width: 100%; border-radius: 2px 2px 0 0; transition: height .3s; }
  .barchart-lbl-bot { font-size: 9px; color: var(--text3); margin-top: 3px; }
  .barchart-unit { text-align: right; color: var(--text3); font-size: 11px; margin-top: 4px; }
  /* ── Compass ── */
  #compass-wrap { display: flex; flex-direction: column; align-items: center; gap: 8px; }
  #compass-svg { cursor: crosshair; touch-action: none; user-select: none; }
  #compass-input {
    width: 70px; background: var(--bg3); border: 1px solid var(--border2);
    color: var(--yellow); border-radius: 6px; padding: 5px 8px;
    font-size: 13px; font-weight: 800; text-align: center;
    font-family: 'Space Mono', monospace;
  }
  .az-btns { display: flex; gap: 4px; flex-wrap: wrap; justify-content: center; }
  .az-btn {
    padding: 2px 7px; font-size: 10px; background: var(--bg4);
    color: var(--text3); border: none; border-radius: 4px; cursor: pointer;
  }
  .az-btn.active { background: var(--accent); color: white; }
  /* ── Map ── */
  #map { height: 240px; border-radius: 7px; overflow: hidden; border: 1px solid var(--border); }
  /* ── PVGIS panel ── */
  #pvgis-box {
    background: #0a1e0a; border: 1px solid #14532d;
    border-radius: 8px; padding: 11px; margin-bottom: 10px;
  }
  #pvgis-box .sec-title { color: var(--green); }
  #pvgis-btn {
    width: 100%; padding: 8px; border-radius: 6px; border: none;
    cursor: pointer; background: linear-gradient(135deg, #14532d, #166534);
    color: white; font-weight: 700; font-size: 12px; font-family: 'Syne', sans-serif;
    transition: opacity .15s;
  }
  #pvgis-btn:disabled { opacity: 0.5; cursor: wait; }
  #pvgis-log { margin-top: 6px; background: #0a1e0a; border-radius: 5px; padding: 6px 8px; font-size: 10px; color: #4ade80; white-space: pre-wrap; line-height: 1.5; display: none; }
  #pvgis-err { margin-top: 6px; background: #1a0a0a; border: 1px solid #7f1d1d; border-radius: 5px; padding: 8px; font-size: 10px; display: none; }
  #pvgis-ok  { margin-top: 7px; background: #0a1e0f; border-radius: 5px; padding: 8px; display: none; }
  /* ── Grid results ── */
  .kpi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 14px; }
  .kpi-card { background: var(--bg4); border-radius: 8px; padding: 10px; text-align: center; }
  .kpi-card .kpi-lbl { color: var(--text3); font-size: 10px; margin-bottom: 3px; }
  .kpi-card .kpi-val { font-size: 14px; font-weight: 900; font-family: 'Space Mono', monospace; }
  /* ── Table ── */
  table { width: 100%; border-collapse: collapse; font-size: 11px; }
  th { color: var(--text3); font-weight: 600; padding: 4px 6px; border-bottom: 1px solid var(--bg4); }
  td { padding: 4px 6px; border-bottom: 1px solid #0f1e2e; }
  tr:last-child td { font-weight: 800; background: #0f2744; }
  /* ── Geo results ── */
  #geo-results { background: var(--bg4); border-radius: 8px; padding: 11px; border: 1px solid var(--accent); }
  .geo-row { display: flex; justify-content: space-between; margin-bottom: 4px; }
  .geo-row .gl { color: var(--text3); font-size: 11px; }
  .geo-row .gv { font-size: 11px; font-weight: 700; font-family: 'Space Mono', monospace; }
  /* ── Calc steps ── */
  .calc-step { background: var(--bg4); border-radius: 7px; padding: 8px 12px; border-left: 3px solid; margin-bottom: 6px; }
  .calc-step .cs-title { font-size: 11px; font-weight: 700; margin-bottom: 2px; }
  .calc-step .cs-formula { color: var(--text3); font-size: 11px; font-family: 'Space Mono', monospace; line-height: 1.4; }
  .calc-step .cs-result { font-size: 12px; font-weight: 700; margin-top: 2px; font-family: 'Space Mono', monospace; }
  /* ── Coord box ── */
  .coord-box { background: var(--bg3); border-radius: 8px; padding: 11px; margin-bottom: 10px; }
  .coord-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 8px; }
  .coord-field label { color: var(--text3); font-size: 10px; display: block; margin-bottom: 2px; }
  .coord-field input {
    width: 100%; background: #0f1e2e; border: 1px solid rgba(59,130,246,.3);
    color: var(--blue2); border-radius: 5px; padding: 5px 6px;
    font-size: 12px; font-family: 'Space Mono', monospace;
  }
  .coord-apply {
    width: 100%; padding: 6px; background: var(--accent); color: white; border: none;
    border-radius: 5px; cursor: pointer; font-size: 11px; font-weight: 700; font-family: 'Syne', sans-serif;
  }
  .coord-display {
    margin-top: 7px; background: #0a1520; border-radius: 5px; padding: 5px 8px;
    display: flex; justify-content: space-between; align-items: center;
  }
  /* ── Legend ── */
  .legend { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
  .legend-item { display: flex; align-items: center; gap: 4px; }
  .legend-dot { width: 12px; height: 3px; border-radius: 2px; }
  .legend-lbl { color: var(--text3); font-size: 20px; }
  /* ── Source badge ── */
  .source-badge { font-size: 11px; font-weight: 700; }
  .source-pvgis { color: var(--green); }
  .source-model { color: var(--yellow); }
  /* ── PVGIS params ── */
  .pvgis-params { font-size: 10px; color: #1a4d2e; margin-bottom: 6px; line-height: 1.4; }
  /* ── Select ── */
  select {
    background: var(--bg3); border: 1px solid var(--border2);
    color: var(--text2); border-radius: 5px; padding: 4px 6px;
    font-size: 12px; font-family: 'Syne', sans-serif; cursor: pointer;
  }
  /* ── Warning box ── */
  .warn-box {
    margin-top: 10px; background: #1c1508; border: 1px solid #78350f;
    border-radius: 8px; padding: 8px 12px; font-size: 11px; color: #fbbf24;
  }
  /* ── Charts row ── */
  .charts-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 14px; }
  .chart-card { background: var(--bg4); border-radius: 8px; padding: 12px; }
  /* ── SVG containers ── */
  .svg-wrap { background: var(--bg); border-radius: 8px; padding: 10px; }
  svg text { font-family: 'Space Mono', monospace; }
  /* ── Scrollbar ── */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
  /* ── Mobile ── */
  @media (max-width: 768px) {
    #layout { grid-template-columns: 1fr; }
    #sidebar { max-height: none; }
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .charts-row { grid-template-columns: 1fr; }
  }
  /* ── Fade-in ── */
  .fade { animation: fadeIn .3s ease; }
  @keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
  
  /* ════════════════════════════════════════════════════════════
     NEW FEATURES: ROI CALCULATOR & PDF EXPORT
     ════════════════════════════════════════════════════════════ */
  
  /* ── Export PDF Button ── */
  #export-pdf-btn {
    padding: 6px 14px;
    background: linear-gradient(135deg, var(--purple), var(--blue));
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 700;
    font-size: 11px;
    cursor: pointer;
    font-family: 'Syne', sans-serif;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  #export-pdf-btn:hover { opacity: 0.9; }
  #export-pdf-btn:disabled { opacity: 0.5; cursor: wait; }
  
  /* ── ROI Input Fields ── */
  .roi-input-row { margin-bottom: 9px; }
  .roi-input-row label { 
    display: block;
    color: var(--text3); 
    font-size: 11px; 
    margin-bottom: 4px;
  }
  .roi-input-row input[type="number"] {
    width: 100%;
    background: var(--bg4);
    border: 1px solid var(--border2);
    color: var(--text);
    padding: 6px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-family: 'Space Mono', monospace;
  }
  .roi-input-row input:focus {
    outline: none;
    border-color: var(--accent);
  }
  
  /* ── ROI Summary Cards ── */
  .roi-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 10px;
    margin-bottom: 16px;
  }
  .roi-card {
    background: var(--bg4);
    border-radius: 8px;
    padding: 12px;
    border-left: 3px solid var(--green);
  }
  .roi-card.warning { border-left-color: var(--orange); }
  .roi-card.info { border-left-color: var(--blue); }
  .roi-card.purple { border-left-color: var(--purple); }
  .roi-card-label {
    color: var(--text3);
    font-size: 10px;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  .roi-card-value {
    font-size: 20px;
    font-weight: 800;
    font-family: 'Space Mono', monospace;
    color: var(--green);
  }
  .roi-card.warning .roi-card-value { color: var(--orange); }
  .roi-card.info .roi-card-value { color: var(--blue); }
  .roi-card.purple .roi-card-value { color: var(--purple); }
  .roi-card-unit {
    color: var(--text3);
    font-size: 9px;
    margin-top: 2px;
  }
  
  /* ── ROI Year Table ── */
  .roi-year-table { 
    width: 100%; 
    border-collapse: collapse; 
    font-size: 11px; 
    margin-top: 12px; 
  }
  .roi-year-table th { 
    background: var(--bg4); 
    color: var(--text3); 
    padding: 6px 8px; 
    text-align: left;
    font-weight: 700;
    border-bottom: 2px solid var(--border);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
  }
  .roi-year-table td {
    padding: 5px 8px;
    border-bottom: 1px solid var(--border);
  }
  .roi-year-table tr:hover {
    background: var(--bg4);
  }
  .roi-year-table .year-col { 
    color: var(--text2); 
    font-weight: 600; 
  }
  .roi-year-table .value-col { 
    font-family: 'Space Mono', monospace;
    text-align: right;
    font-size: 11px;
  }
  .roi-year-table .positive { color: var(--green); }
  .roi-year-table .negative { color: var(--red); }
  .roi-year-table .highlight-row {
    background: rgba(34, 197, 94, 0.1);
    font-weight: 700;
  }
  
  /* ── ROI Chart Container ── */
  .roi-chart-container {
    background: var(--bg4);
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 16px;
  }
  .roi-chart-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text2);
    margin-bottom: 12px;
  }
  
  @media print {
    #sidebar, #tabs, #export-pdf-btn, #lang-btn { display: none !important; }
    #layout { grid-template-columns: 1fr !important; }
  }