/* \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550
   Optimizador de Potencias \u2014 Estilos Premium
   \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(99, 102, 241, 0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
  --green: #10b981;
  --green-bg: rgba(16, 185, 129, 0.1);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.1);
  --yellow: #f59e0b;
  --yellow-bg: rgba(245, 158, 11, 0.1);
  --blue: #3b82f6;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* \u2500\u2500 Background glow \u2500\u2500 */
body::before {
  content: '';
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.08), transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.06), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* \u2500\u2500 Layout \u2500\u2500 */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem; position: relative; z-index: 1; }

/* \u2500\u2500 Header \u2500\u2500 */
.header { text-align: center; margin-bottom: 2rem; }
.header h1 {
  font-size: 2.2rem; font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 0.5rem; letter-spacing: -0.02em;
}
.header p { color: var(--text-secondary); font-size: 1.05rem; font-weight: 300; }

/* \u2500\u2500 Cards \u2500\u2500 */
.card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 1.75rem; margin-bottom: 1.5rem;
  backdrop-filter: blur(20px); transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.card:hover { border-color: var(--border-accent); box-shadow: var(--shadow-glow); }
.card-title {
  font-size: 1.1rem; font-weight: 700; color: var(--text-primary);
  margin-bottom: 1.25rem; display: flex; align-items: center; gap: 0.6rem;
}
.card-title .icon { font-size: 1.3rem; }

/* \u2500\u2500 Drag & Drop \u2500\u2500 */
.drop-zone {
  border: 2px dashed var(--border-color); border-radius: var(--radius);
  padding: 1.75rem 2rem; text-align: center; cursor: pointer;
  transition: all 0.3s ease; background: var(--bg-glass);
}
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--accent-primary); background: rgba(99, 102, 241, 0.05); }
.drop-zone .icon { font-size: 2.2rem; margin-bottom: 0.5rem; display: block; }
.drop-zone p { color: var(--text-secondary); font-size: 0.95rem; }
.drop-zone .hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.5rem; }
.file-input { display: none; }

/* \u2500\u2500 File info \u2500\u2500 */
.file-info {
  display: none; gap: 1rem; padding: 1rem;
  border-radius: var(--radius-sm); background: var(--green-bg);
  border: 1px solid rgba(16, 185, 129, 0.2); margin-top: 1rem;
}
.file-info.visible { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.file-info .stat { display: flex; flex-direction: column; }
.file-info .stat-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.file-info .stat-value { font-size: 0.95rem; font-weight: 600; color: var(--green); }

/* \u2500\u2500 Form elements \u2500\u2500 */
.form-grid { display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 1rem; }
@media (max-width: 768px) { .form-grid { grid-template-columns: 1fr; } }
.form-group { display: flex; flex-direction: column; gap: 0.35rem; }
.form-group label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.04em; }
.form-group select, .form-group input {
  padding: 0.65rem 0.85rem; background: var(--bg-primary);
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  color: var(--text-primary); font-family: inherit; font-size: 0.9rem;
  transition: border-color 0.2s; outline: none;
}
.form-group select:focus, .form-group input:focus { border-color: var(--accent-primary); }
.form-group input[type="number"] { font-variant-numeric: tabular-nums; }

.checkbox-group { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.5rem; }
.checkbox-group input[type="checkbox"] { accent-color: var(--accent-primary); width: 16px; height: 16px; }
.checkbox-group label { font-size: 0.85rem; color: var(--text-secondary); cursor: pointer; }

/* \u2500\u2500 Potencias grid \u2500\u2500 */
.potencias-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0.75rem; margin-top: 0.75rem; }
.potencias-grid .form-group input { text-align: center; width: 100%; min-width: 0; }
@media (max-width: 640px) { .potencias-grid { grid-template-columns: repeat(3, 1fr); } }

/* \u2500\u2500 Buttons \u2500\u2500 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border: none; border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s ease;
}
.btn-primary { background: var(--accent-gradient); color: white; box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-secondary { background: var(--bg-glass); border: 1px solid var(--border-color); color: var(--text-secondary); }
.btn-secondary:hover { border-color: var(--accent-primary); color: var(--text-primary); }
.btn-actions { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }

/* \u2500\u2500 Results \u2500\u2500 */
#results { display: none; }
#results.visible { display: block; }

.savings-banner {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(16, 185, 129, 0.05));
  border: 1px solid rgba(16, 185, 129, 0.3); border-radius: var(--radius);
  padding: 2rem; text-align: center; margin-bottom: 1.5rem;
}
.savings-banner .amount { font-size: 3rem; font-weight: 800; color: var(--green); line-height: 1.1; }
.savings-banner .percent { font-size: 1.3rem; color: var(--green); font-weight: 600; }
.savings-banner .label { font-size: 0.9rem; color: var(--text-secondary); margin-top: 0.25rem; }
.savings-negative .amount, .savings-negative .percent { color: var(--red); }

/* \u2500\u2500 Comparison table \u2500\u2500 */
.comparison-table { width: 100%; border-collapse: separate; border-spacing: 0; font-variant-numeric: tabular-nums; }
.comparison-table th {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-muted); padding: 0.75rem 0.85rem; text-align: right;
  border-bottom: 1px solid var(--border-color);
}
.comparison-table th:first-child { text-align: left; }
.comparison-table td { padding: 0.65rem 0.85rem; text-align: right; border-bottom: 1px solid rgba(255, 255, 255, 0.03); font-size: 0.9rem; }
.comparison-table td:first-child { text-align: left; font-weight: 600; color: var(--text-secondary); }
.comparison-table tr:last-child td { border-bottom: none; font-weight: 700; color: var(--text-primary); }
.comparison-table .highlight-green { color: var(--green); }
.comparison-table .highlight-red { color: var(--red); }

/* \u2500\u2500 Editable inputs in results \u2500\u2500 */
.editable-pc {
  background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px;
  color: var(--accent-primary); font-family: inherit; font-size: 0.9rem; font-weight: 600;
  text-align: center; width: 80px; padding: 0.3rem; transition: border-color 0.2s;
}
.editable-pc:focus { border-color: var(--accent-primary); outline: none; }

/* \u2500\u2500 Monthly detail table \u2500\u2500 */
.monthly-table { width: 100%; border-collapse: separate; border-spacing: 0; font-variant-numeric: tabular-nums; font-size: 0.85rem; }
.monthly-table th {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--text-muted); padding: 0.6rem; text-align: right;
  border-bottom: 1px solid var(--border-color); white-space: nowrap;
}
.monthly-table th:first-child { text-align: left; }
.monthly-table td { padding: 0.5rem 0.6rem; text-align: right; border-bottom: 1px solid rgba(255, 255, 255, 0.03); }
.monthly-table td:first-child { text-align: left; font-weight: 600; color: var(--text-secondary); }
.monthly-table tr:last-child td { font-weight: 700; border-top: 1px solid var(--border-color); border-bottom: none; color: var(--text-primary); }

/* \u2500\u2500 Bar chart \u2500\u2500 */
.chart-container { display: grid; gap: 0.5rem; margin-top: 1rem; }
.chart-row { display: grid; grid-template-columns: 70px 1fr 70px; align-items: center; gap: 0.75rem; }
.chart-label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 600; text-align: right; }
.chart-bar-wrap { display: flex; gap: 2px; height: 28px; border-radius: 4px; overflow: hidden; }
.chart-bar-fijo { background: var(--accent-primary); height: 100%; transition: width 0.5s ease; border-radius: 4px 0 0 4px; }
.chart-bar-exceso { background: var(--red); height: 100%; transition: width 0.5s ease; border-radius: 0 4px 4px 0; }
.chart-value { font-size: 0.8rem; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.chart-legend { display: flex; gap: 1.5rem; justify-content: center; margin-top: 1rem; }
.chart-legend-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.8rem; color: var(--text-secondary); }
.chart-legend-dot { width: 10px; height: 10px; border-radius: 2px; }

/* \u2500\u2500 Loading animation \u2500\u2500 */
.loader { display: none; text-align: center; padding: 2rem; }
.loader.visible { display: block; }
.loader-spinner {
  width: 40px; height: 40px; border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary); border-radius: 50%;
  animation: spin 0.8s linear infinite; margin: 0 auto 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loader p { color: var(--text-secondary); font-size: 0.9rem; }

/* \u2500\u2500 Section separator \u2500\u2500 */
.section-sep { height: 1px; background: var(--border-color); margin: 0.5rem 0 1.25rem; }

/* \u2500\u2500 Responsive \u2500\u2500 */
@media (max-width: 768px) {
  .container { padding: 1rem; }
  .header h1 { font-size: 1.6rem; }
  .form-grid { grid-template-columns: 1fr; }
  .savings-banner .amount { font-size: 2rem; }
  .chart-row { grid-template-columns: 50px 1fr 50px; }
}