/* ==========================================================================
   Calculadora de zonas de frecuencia cardíaca Karvonen - Fijate Tools
   ========================================================================== */

:root {
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Paleta base en tema oscuro (predeterminado) */
  --bg-page: #0b0f17;
  --bg-card: #111827;
  --bg-card-subtle: #161f32;
  --bg-card-hover: #1b263e;
  --bg-input: #1a2336;
  --border-color: rgba(255, 255, 255, 0.09);
  --border-color-focus: #ef4444;
  --text-main: #f3f4f6;
  --text-muted: #94a3b8;
  --text-muted-dark: #64748b;

  /* Color temático corazón y energía */
  --primary-color: #ef4444;
  --primary-hover: #dc2626;
  --primary-light: rgba(239, 68, 68, 0.14);
  --primary-border: rgba(239, 68, 68, 0.35);

  /* Acentos de estado */
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.15);
  --color-info: #0284c7;
  --color-info-bg: rgba(2, 132, 199, 0.15);

  /* Colores de las 5 zonas de esfuerzo cardiovascular */
  --z1-color: #64748b;
  --z1-bg: rgba(100, 116, 139, 0.15);
  --z1-border: rgba(100, 116, 139, 0.3);

  --z2-color: #10b981;
  --z2-bg: rgba(16, 185, 129, 0.16);
  --z2-border: rgba(16, 185, 129, 0.35);

  --z3-color: #f59e0b;
  --z3-bg: rgba(245, 158, 11, 0.16);
  --z3-border: rgba(245, 158, 11, 0.35);

  --z4-color: #f97316;
  --z4-bg: rgba(249, 115, 22, 0.16);
  --z4-border: rgba(249, 115, 22, 0.35);

  --z5-color: #ef4444;
  --z5-bg: rgba(239, 68, 68, 0.16);
  --z5-border: rgba(239, 68, 68, 0.35);

  /* Sombras y radios */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.35);
}

/* Tema claro institucional */
[data-theme="light"],
body.light-theme {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-subtle: #f1f5f9;
  --bg-card-hover: #e2e8f0;
  --bg-input: #ffffff;
  --border-color: #e2e8f0;
  --border-color-focus: #dc2626;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-muted-dark: #94a3b8;

  --primary-color: #e11d48;
  --primary-hover: #be123c;
  --primary-light: #ffe4e6;
  --primary-border: #fca5a5;

  --color-success: #059669;
  --color-success-bg: #d1fae5;
  --color-warning: #d97706;
  --color-warning-bg: #fef3c7;
  --color-info: #0284c7;
  --color-info-bg: #e0f2fe;

  --z1-color: #475569;
  --z1-bg: #f1f5f9;
  --z1-border: #cbd5e1;

  --z2-color: #047857;
  --z2-bg: #ecfdf5;
  --z2-border: #a7f3d0;

  --z3-color: #b45309;
  --z3-bg: #fffbeb;
  --z3-border: #fde68a;

  --z4-color: #c2410c;
  --z4-bg: #fff7ed;
  --z4-border: #ffedd5;

  --z5-color: #b91c1c;
  --z5-bg: #fef2f2;
  --z5-border: #fecaca;

  --shadow-card: 0 2px 12px rgba(15, 23, 42, 0.06);
}

/* Reseteo y contención básica */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6,
.brand-title,
.panel-title,
.section-heading,
.faq-section-title {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

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

/* Contenedor principal */
.tool-layout {
  flex: 1 0 auto;
  max-width: 1200px;
  margin: 1.5rem auto 3rem;
  padding: 0 1rem;
  width: 100%;
}

.card-main {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Hero Box de introducción
   ========================================================================== */
.tool-hero-box {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 1.75rem;
}

.hero-tagline {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-main);
}

.quick-badges-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.pill-emerald {
  background-color: var(--z2-bg);
  color: var(--z2-color);
  border: 1px solid var(--z2-border);
}

.pill-sky {
  background-color: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid rgba(2, 132, 199, 0.3);
}

.pill-violet {
  background-color: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

[data-theme="light"] .pill-violet,
body.light-theme .pill-violet {
  color: #7e22ce;
  background-color: #f3e8ff;
  border-color: #e9d5ff;
}

.pill-amber {
  background-color: var(--z3-bg);
  color: var(--z3-color);
  border: 1px solid var(--z3-border);
}

/* ==========================================================================
   Grid superior: Formulario (izq) y Diagnóstico Reserva (dcha)
   ========================================================================== */
.tool-grid-setup {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .tool-grid-setup {
    grid-template-columns: 1fr;
  }
}

.setup-card,
.summary-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.panel-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-text-action {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

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

/* Formulario */
.form-flow {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-row-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 520px) {
  .form-row-dual {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.label-with-aside {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.input-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.unit-tag {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

.field-hint {
  font-size: 0.77rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Control segmentado hombre/mujer */
.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 3px;
  height: 42px;
}

.segment-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.88rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.18s ease;
  height: 100%;
}

.segment-btn.active {
  background-color: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.4);
}

/* Inputs de texto y números */
.form-input {
  width: 100%;
  height: 42px;
  padding: 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input:read-only {
  background-color: var(--bg-card-subtle);
  cursor: default;
  opacity: 0.9;
}

/* Input con sufijo (wrapper flexbox canónico) */
.input-unit-wrapper {
  display: flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  height: 42px;
}

.input-unit-wrapper .form-input {
  flex: 1 1 0%;
  width: 0;
  min-width: 0;
  border: none;
  background: transparent;
  height: 100%;
}

.input-unit-wrapper:focus-within {
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.input-suffix {
  padding: 0 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  user-select: none;
  white-space: nowrap;
}

/* Combo slider + input numérico */
.slider-input-combo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.combo-number {
  flex: 0 0 105px;
  width: 105px;
}

.form-range {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  background: var(--border-color);
  border-radius: var(--radius-full);
  outline: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: 2px solid #ffffff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  transition: transform 0.1s ease;
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.form-range:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Select canónico anti-desbordamiento */
.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  height: 42px;
  padding: 0 40px 0 0.85rem;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  font-family: var(--font-main);
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  appearance: none;
  -webkit-appearance: none;
  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' 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;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

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

.form-select option {
  background-color: var(--bg-card);
  color: var(--text-main);
}

/* Botón micro-acción medidor tap */
.btn-micro-action {
  background-color: var(--primary-light);
  border: 1px solid var(--primary-border);
  color: var(--primary-color);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-micro-action:hover {
  background-color: var(--primary-color);
  color: #ffffff;
}

.badge-status-auto {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background-color: rgba(2, 132, 199, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(2, 132, 199, 0.3);
}

[data-theme="light"] .badge-status-auto,
body.light-theme .badge-status-auto {
  background-color: #e0f2fe;
  color: #0369a1;
  border-color: #bae6fd;
}

/* ==========================================================================
   Panel de Resumen Fisiológico (Summary Card)
   ========================================================================== */
.summary-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hrr-hero-metric {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.12) 0%, rgba(16, 185, 129, 0.08) 100%);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}

.metric-top-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary-color);
  margin-bottom: 0.35rem;
}

.metric-main-val {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.35rem;
}

.metric-main-val .val-number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-main);
}

.metric-main-val .val-unit {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-muted);
}

.metric-formula-calc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0.4rem 0 0.6rem;
}

.metric-desc {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Mini cuadrícula de 3 métricas */
.metrics-mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

@media (max-width: 600px) {
  .metrics-mini-grid {
    grid-template-columns: 1fr;
  }
}

.mini-metric-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mini-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.mini-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.mini-val small {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.mini-subtext {
  font-size: 0.72rem;
  color: var(--z2-color);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Termómetro de zonas */
.heart-gauge-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.gauge-labels-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.gauge-track-bar {
  display: flex;
  height: 22px;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.25);
}

.gauge-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #ffffff;
  transition: opacity 0.2s ease;
}

.gauge-segment.z1 { background-color: var(--z1-color); }
.gauge-segment.z2 { background-color: var(--z2-color); }
.gauge-segment.z3 { background-color: var(--z3-color); }
.gauge-segment.z4 { background-color: var(--z4-color); }
.gauge-segment.z5 { background-color: var(--z5-color); }

/* ==========================================================================
   Pestañas de Navegación de Vistas
   ========================================================================== */
.tool-tabs-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.75rem;
  overflow-x: auto;
  padding-bottom: 2px;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-panel {
  display: none;
  animation: fadeIn 0.2s ease forwards;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-intro {
  margin-bottom: 1.5rem;
}

.section-heading {
  margin: 0 0 0.35rem;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.section-lead {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Pestaña 1: Tarjetas de las 5 Zonas
   ========================================================================== */
.zones-cards-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.zone-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-left: 6px solid var(--z1-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.zone-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.zone-card.z1 { border-left-color: var(--z1-color); }
.zone-card.z2 { border-left-color: var(--z2-color); background: linear-gradient(90deg, var(--z2-bg) 0%, var(--bg-card-subtle) 40%); }
.zone-card.z3 { border-left-color: var(--z3-color); }
.zone-card.z4 { border-left-color: var(--z4-color); }
.zone-card.z5 { border-left-color: var(--z5-color); }

.zone-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

@media (max-width: 650px) {
  .zone-card-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

.zone-ident {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.zone-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
  color: #ffffff;
}

.zone-tag.z1 { background-color: var(--z1-color); }
.zone-tag.z2 { background-color: var(--z2-color); }
.zone-tag.z3 { background-color: var(--z3-color); }
.zone-tag.z4 { background-color: var(--z4-color); }
.zone-tag.z5 { background-color: var(--z5-color); }

.zone-title-group h4 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.zone-title-group span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.zone-range-metric {
  text-align: right;
}

@media (max-width: 650px) {
  .zone-range-metric {
    text-align: left;
  }
}

.zone-ppm-big {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.zone-diff-note {
  font-size: 0.78rem;
  color: var(--color-warning);
  font-weight: 600;
}

.zone-card-body {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 1rem;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
}

@media (max-width: 780px) {
  .zone-card-body {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
}

.zone-description {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-main);
}

.zone-pill-metric {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pill-metric-lbl {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-weight: 600;
}

.pill-metric-val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Tarjeta calculador puntual */
.point-calculator-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.point-calc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 600px) {
  .point-calc-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

.calc-subheading {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.calc-desc {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.intensity-display-badge {
  background-color: var(--primary-light);
  border: 1px solid var(--primary-border);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.intensity-display-badge span {
  display: block;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary-color);
  line-height: 1;
}

.intensity-display-badge small {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
}

.point-calc-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.point-calc-results-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

@media (max-width: 768px) {
  .point-calc-results-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .point-calc-results-row {
    grid-template-columns: 1fr;
  }
}

.calc-res-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.res-label {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-muted);
}

.res-val {
  font-size: 1.25rem;
  font-weight: 800;
}

.text-primary { color: var(--primary-color); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--color-warning); }

.res-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background-color: var(--z2-bg);
  color: var(--z2-color);
}

/* ==========================================================================
   Pestaña 2: Comparativa Karvonen vs Tradicional
   ========================================================================== */
.info-callout-card {
  display: flex;
  gap: 1rem;
  background-color: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.25);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.75rem;
}

.callout-icon {
  color: #0284c7;
  flex-shrink: 0;
  margin-top: 2px;
}

.callout-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.callout-text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-main);
}

.table-responsive-box {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1.75rem;
  -webkit-overflow-scrolling: touch;
}

.data-table-comparison,
.data-table-zones {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.data-table-comparison th,
.data-table-zones th {
  background-color: var(--bg-card-subtle);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table-comparison td,
.data-table-zones td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  white-space: nowrap;
}

.data-table-comparison tr:last-child td,
.data-table-zones tr:last-child td {
  border-bottom: none;
}

.data-table-comparison tr:hover td,
.data-table-zones tr:hover td {
  background-color: var(--bg-card-hover);
}

/* Gráfico visual de barras comparativas */
.comparison-visual-card {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.comparison-bars-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1rem;
}

.comp-bar-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.comp-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  font-weight: 600;
}

.comp-bar-track {
  height: 28px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.comp-range-fill {
  position: absolute;
  top: 0;
  bottom: 0;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

/* ==========================================================================
   Pestaña 3: Metabolismo y FatMax
   ========================================================================== */
.metabolic-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .metabolic-grid {
    grid-template-columns: 1fr;
  }
}

.chart-canvas-box {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.chart-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.chart-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.chart-legend-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.dot-color {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-fats { background-color: var(--z2-color); }
.dot-carbs { background-color: var(--z5-color); }
.dot-cross { background-color: var(--z3-color); }

.canvas-wrapper {
  width: 100%;
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}

#canvas-metabolic {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 600 / 320;
}

.chart-axis-caption {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.metabolic-insights-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.insight-card-item {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.card-fatmax { border-left: 4px solid var(--z2-color); }
.card-crossover { border-left: 4px solid var(--z3-color); }
.card-calories { border-left: 4px solid var(--primary-color); }

.insight-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.insight-title {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
}

.insight-desc {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-main);
  line-height: 1.5;
}

.cal-zones-compact {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.cal-zone-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 0.3rem;
}

.cal-zone-row:last-child {
  border-bottom: none;
}

.cal-zone-row strong {
  color: var(--text-main);
}

/* ==========================================================================
   Pestaña 4: Pulsómetros y Exportación
   ========================================================================== */
.export-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.export-actions-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn-action-primary {
  background-color: var(--primary-color);
  border: 1px solid var(--primary-hover);
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0 1rem;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.btn-action-secondary {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0 1rem;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.export-device-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.device-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.device-select {
  height: 40px;
  min-width: 170px;
}

.device-instructions-box {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
}

.inst-header {
  margin-bottom: 0.75rem;
}

.inst-steps-list {
  margin: 0;
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-main);
}

/* ==========================================================================
   Sección FAQ
   ========================================================================== */
.tool-faq-section {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  margin-top: 2.5rem;
}

.faq-section-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  color: var(--text-main);
}

.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.faq-item[open] {
  border-color: var(--primary-border);
}

.faq-question {
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  user-select: none;
  color: var(--text-main);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-main);
}

.faq-answer p {
  margin: 0 0 0.75rem;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Modales Canónicos
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay[hidden] {
  display: none !important;
}

.modal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalPop 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.modal-card-sm {
  max-width: 380px;
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.95) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-modal-close:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.modal-body {
  padding: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-main);
}

.modal-intro {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.tap-interactive-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 0;
}

.btn-tap-heart {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
  border: 4px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.45);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-tap-heart:active,
.btn-tap-heart.heart-beat {
  transform: scale(0.92);
  box-shadow: 0 2px 10px rgba(239, 68, 68, 0.6);
}

.tap-action-text {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tap-live-stats {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tap-bpm-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.35rem;
}

.tap-bpm-val {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--primary-color);
}

.tap-bpm-unit {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-muted);
}

.tap-meta-info {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card-subtle);
}

.modal-footer.justify-center {
  justify-content: center;
}

.btn-primary {
  background-color: var(--primary-color);
  border: 1px solid var(--primary-hover);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0 1.25rem;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0 1rem;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.feedback-icon-box {
  display: flex;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.feedback-text {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.text-center { text-align: center; }

/* ==========================================================================
   Vista de Impresión Oficial A4 (.print-sheet)
   ========================================================================== */
.print-sheet {
  display: none;
}

@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 11pt;
  }

  .app-header,
  .tools-ad-banner-section,
  .tool-ad-sidebar,
  .fijate-footer,
  .card-main,
  .modal-overlay {
    display: none !important;
  }

  .print-sheet {
    display: block !important;
    max-width: 210mm;
    margin: 0 auto;
    padding: 10mm;
  }

  .print-header {
    border-bottom: 2px solid #000000;
    padding-bottom: 8mm;
    margin-bottom: 6mm;
  }

  .print-header h2 {
    margin: 0 0 2mm;
    font-size: 16pt;
  }

  .print-meta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4mm;
    margin-bottom: 8mm;
    font-size: 10pt;
  }

  .print-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 8mm;
  }

  .print-table th,
  .print-table td {
    border: 1px solid #333333;
    padding: 3mm 4mm;
    text-align: left;
    font-size: 9.5pt;
  }

  .print-table th {
    background-color: #f0f0f0;
    font-weight: bold;
  }

  .print-footer-note {
    font-size: 8.5pt;
    color: #555555;
    border-top: 1px solid #cccccc;
    padding-top: 4mm;
  }
}