/* ==========================================================================
   Calculadora de Caída de Tensión (REBT ITC-BT-19) - Fijate Tools
   Estilos canónicos para tema claro/oscuro con estándares WCAG AA
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Modo oscuro canónico por defecto */
  --bg-app: #0b0f17;
  --bg-card: #131b28;
  --bg-card-hover: #1b2536;
  --bg-card-subtle: #0f1520;
  --bg-input: #0a0e16;
  --border-color: #212c3f;
  --border-focus: #3b82f6;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-primary-glow: rgba(37, 99, 235, 0.25);

  --accent-success: #10b981;
  --accent-success-subtle: rgba(16, 185, 129, 0.12);
  --accent-warning: #f59e0b;
  --accent-warning-subtle: rgba(245, 158, 11, 0.12);
  --accent-danger: #ef4444;
  --accent-danger-subtle: rgba(239, 68, 68, 0.12);
  --accent-electric: #0ea5e9;
  --accent-electric-subtle: rgba(14, 165, 233, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, 0.5);

  --color-scheme: dark;
}

[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-card-subtle: #f8fafc;
  --bg-input: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #2563eb;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --accent-primary: #1d4ed8;
  --accent-primary-hover: #1e40af;
  --accent-primary-glow: rgba(29, 78, 216, 0.2);

  --accent-success: #059669;
  --accent-success-subtle: rgba(5, 150, 105, 0.1);
  --accent-warning: #d97706;
  --accent-warning-subtle: rgba(217, 119, 6, 0.1);
  --accent-danger: #dc2626;
  --accent-danger-subtle: rgba(220, 38, 38, 0.1);
  --accent-electric: #0284c7;
  --accent-electric-subtle: rgba(2, 132, 199, 0.1);

  --shadow-card: 0 2px 10px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08);

  --color-scheme: light;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

.num-mono {
  font-family: var(--font-mono);
}

.tool-layout {
  max-width: 1240px;
  width: 100%;
  margin: 1.5rem auto 3.5rem;
  padding: 0 1.25rem;
  flex: 1 0 auto;
}

.tool-with-sidebar {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.tool-main-content {
  flex: 1 1 0%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Hero */
.tool-hero {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.tool-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: var(--accent-electric-subtle);
  border: 1px solid var(--accent-electric);
  color: var(--accent-electric);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  width: fit-content;
}

.tool-hero h2 {
  font-size: 1.85rem;
  letter-spacing: -0.02em;
}

.tool-hero p {
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 820px;
}

/* HUD Métricas */
.hud-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.hud-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.hud-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.hud-card.highlight {
  border-color: var(--accent-electric);
  background: linear-gradient(145deg, var(--bg-card), var(--accent-electric-subtle));
}

.hud-card .hud-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hud-card .hud-value {
  font-size: 1.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-main);
  line-height: 1.1;
  word-break: break-word;
}

.hud-card.highlight .hud-value {
  color: var(--accent-electric);
}

.hud-card .hud-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Badge de Estado REBT */
.badge-status-rebt {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  width: fit-content;
}

.badge-status-rebt.pass {
  background: var(--accent-success-subtle);
  border: 1px solid var(--accent-success);
  color: var(--accent-success);
}

.badge-status-rebt.fail {
  background: var(--accent-danger-subtle);
  border: 1px solid var(--accent-danger);
  color: var(--accent-danger);
}

/* Layout Grid */
.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 1.75rem;
  align-items: flex-start;
}

.card-main {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.card-header-clean {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.card-header-clean h3 {
  font-size: 1.22rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.card-header-clean h3 svg {
  color: var(--accent-primary);
}

/* Formularios */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-label-hint {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 400;
}

.form-control,
.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  height: 44px;
  min-height: 44px;
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.input-hero-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-hero-wrapper input {
  font-size: 1.35rem;
  font-weight: 700;
  font-family: var(--font-mono);
  height: 52px;
  min-height: 52px;
  padding-right: 50px;
  color: var(--accent-electric);
  background-color: var(--bg-input);
}

.input-hero-suffix {
  position: absolute;
  right: 16px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-dim);
  pointer-events: none;
}

.form-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  padding-right: 42px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  color-scheme: var(--color-scheme);
}

.form-select option,
.form-select optgroup {
  background-color: var(--bg-card);
  color: var(--text-main);
  padding: 8px 12px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

/* Tabla de Comparativa de Secciones */
.section-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.section-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.section-table th,
.section-table td {
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

.section-table th {
  background: var(--bg-card-subtle);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.section-table tbody tr:last-child td {
  border-bottom: none;
}

.section-table td.num-cell {
  text-align: right;
  font-family: var(--font-mono);
}

.section-table tr.row-recommended {
  background: var(--accent-electric-subtle);
  font-weight: 700;
}

.section-table tr.row-recommended td {
  color: var(--accent-electric);
}

/* Insignias de tabla */
.pill-table-pass {
  color: var(--accent-success);
  font-weight: 700;
}

.pill-table-fail {
  color: var(--accent-danger);
  font-weight: 600;
}

/* Botones de acción */
.btn-action-group {
  display: flex;
  gap: 0.85rem;
}

.btn-primary,
.btn-secondary {
  height: 44px;
  min-height: 44px;
  padding: 0 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background-color 0.15s ease, transform 0.1s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
}

/* Modal Canónico */
.fijate-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.fijate-modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.fijate-modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  transform: scale(0.95);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.fijate-modal-backdrop.active .fijate-modal-box {
  transform: scale(1);
}

.fijate-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.fijate-modal-header h4 {
  font-size: 1.15rem;
}

.fijate-modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
}

.fijate-modal-close:hover {
  color: var(--text-main);
}

.fijate-modal-body {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Tarjeta normativa */
.card-normative {
  background: var(--bg-card-subtle);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-normative strong {
  color: var(--text-main);
}

/* Impresión */
@media print {
  body { background: #fff !important; color: #000 !important; }
  .app-header, .tools-ad-banner-section, .tool-ad-sidebar, .fijate-footer, .btn-action-group { display: none !important; }
  .tool-layout { margin: 0 !important; padding: 0 !important; max-width: 100% !important; }
  .calc-grid { grid-template-columns: 1fr !important; }
  .card-main { border: 1px solid #ccc !important; box-shadow: none !important; background: #fff !important; }
}

/* Responsividad */
@media (max-width: 1024px) {
  .hud-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calc-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .tool-layout { padding: 0 0.85rem; margin: 1rem auto 2.5rem; }
  .tool-hero h2 { font-size: 1.5rem; }
  .hud-metrics { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .btn-action-group { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; }
}