/* ============================================================
   CALCULADORA IMC — Premium Design System
   Inspirado en: Stripe · Apple Health · Linear · Vercel
   ============================================================ */
/* BASE */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-feature-settings: "cv02","cv03","cv04","cv11";
  letter-spacing: -0.01em;
  line-height: 1.6;
  background: #fff;
  color: #0f172a;
  transition: background 0.25s ease, color 0.25s ease;
}
/* CSS VARIABLES */
:root {
  --accent:        #2563EB;
  --accent-hover:  #1d4ed8;
  --accent-light:  #eff6ff;
  --accent-muted:  #bfdbfe;
  --surface:       #ffffff;
  --surface-2:     #f8fafc;
  --surface-3:     #f1f5f9;
  --border:        #e2e8f0;
  --border-strong: #cbd5e1;
  --text-primary:  #0f172a;
  --text-secondary:#475569;
  --text-muted:    #94a3b8;
  --radius-sm:  6px;
  --radius:     10px;
  --radius-lg:  14px;
  --radius-xl:  18px;
  --shadow-sm:  0 1px 2px 0 rgba(15,23,42,.06);
  --shadow:     0 1px 3px 0 rgba(15,23,42,.08), 0 1px 2px -1px rgba(15,23,42,.06);
  --shadow-md:  0 4px 8px -1px rgba(15,23,42,.1), 0 2px 4px -2px rgba(15,23,42,.07);
  --shadow-lg:  0 12px 20px -3px rgba(15,23,42,.1), 0 4px 8px -4px rgba(15,23,42,.07);
  --shadow-xl:  0 24px 40px -6px rgba(15,23,42,.12), 0 8px 16px -8px rgba(15,23,42,.08);
}
.dark {
  --accent:        #3b82f6;
  --accent-hover:  #60a5fa;
  --accent-light:  rgba(37,99,235,0.12);
  --accent-muted:  rgba(37,99,235,0.25);
  --surface:       #0d1117;
  --surface-2:     #161b22;
  --surface-3:     #1c2128;
  --border:        #21262d;
  --border-strong: #30363d;
  --text-primary:  #f0f6fc;
  --text-secondary:#8b949e;
  --text-muted:    #6e7681;
  --shadow-sm:  0 1px 2px 0 rgba(0,0,0,.3);
  --shadow:     0 1px 3px 0 rgba(0,0,0,.3), 0 1px 2px -1px rgba(0,0,0,.2);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,.3), 0 2px 4px -2px rgba(0,0,0,.2);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,.3), 0 4px 6px -4px rgba(0,0,0,.15);
  --shadow-xl:  0 20px 25px -5px rgba(0,0,0,.3), 0 8px 10px -6px rgba(0,0,0,.15);
}
.dark body { background: var(--surface); color: var(--text-primary); }
/* SCROLL REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.16,1,0.3,1), transform 0.6s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible { opacity: 1; transform: none; }
/* NAVBAR */
.navbar {
  position: sticky; top: 0; z-index: 50; height: 60px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease;
  box-shadow: 0 1px 0 var(--border), 0 2px 8px rgba(15,23,42,0.04);
}
.dark .navbar {
  background: rgba(13,17,23,0.92);
  box-shadow: 0 1px 0 var(--border);
}
/* HERO */
.hero-section {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: flex-start;
  position: relative; overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(37,99,235,0.06) 0%, transparent 70%);
}
.dark .hero-section::before {
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(59,130,246,0.09) 0%, transparent 70%);
}
/* FEATURE PILLS */
.feature-pill {
  display: inline-flex; align-items: center;
  font-size: 0.75rem; font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 99px;
}
/* CALC PANEL — composición vertical: inputs arriba, resultado abajo */
.calc-panel {
  display: flex; flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 0 0 1px rgba(15,23,42,0.02),
              0 24px 48px -8px rgba(15,23,42,0.14),
              0 12px 24px -4px rgba(15,23,42,0.08);
  background: var(--surface);
  overflow: hidden;
  position: relative; z-index: 1;
}
.dark .calc-panel {
  box-shadow: 0 0 0 1px rgba(255,255,255,0.04),
              0 24px 48px -8px rgba(0,0,0,0.4);
}
/* TOP: barra de inputs */
.calc-panel__top {
  padding: 1.25rem 1.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
/* Fila de inputs — desktop */
.calc-inputs-bar {
  display: flex; align-items: flex-end; gap: 0;
}
.cib-field {
  display: flex; flex-direction: column; gap: 4px;
  flex: 1; min-width: 0; padding: 0 1rem;
}
.cib-field:first-child { padding-left: 0; }
.cib-field--sm { flex: 0 1 88px; }
.cib-field--gender { flex: 0 1 176px; }
.cib-divider {
  width: 1px; height: 44px; background: var(--border);
  flex-shrink: 0; align-self: flex-end; margin-bottom: 2px;
}
.cib-label {
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-muted); white-space: nowrap;
}
.cib-unit { font-weight: 400; text-transform: none; letter-spacing: 0; opacity: 0.7; }
.cib-input {
  width: 100%;
  background: transparent;
  border: none; border-bottom: 2px solid var(--border);
  border-radius: 0; padding: 6px 0;
  font-size: 1.25rem; font-weight: 600;
  color: var(--text-primary); font-family: inherit;
  transition: border-color 0.15s ease;
  -webkit-appearance: none; appearance: none;
}
.cib-input::placeholder { color: var(--text-muted); font-weight: 400; font-size: 1rem; }
.cib-input:focus { outline: none; border-bottom-color: var(--accent); }
.cib-error { font-size: 0.6875rem; color: #dc2626; margin-top: 2px; }
.cib-gender { display: flex; gap: 6px; }
/* Botón calcular en la barra */
.cib-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 10px 20px;
  background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius);
  font-size: 0.9375rem; font-weight: 700; letter-spacing: -0.01em;
  cursor: pointer; font-family: inherit; white-space: nowrap;
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
  box-shadow: 0 1px 2px rgba(37,99,235,.25), 0 4px 12px rgba(37,99,235,.2);
  margin-left: 1rem; flex-shrink: 0;
}
.cib-btn:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,.3); }
.cib-btn:active { transform: none; box-shadow: none; }
/* Subrow: toggle + trust */
.calc-subrow {
  display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap;
  gap: 8px; margin-top: 0.875rem; padding-top: 0.875rem;
  border-top: 1px solid var(--border);
}
/* ─── MOBILE ─────────────────────────────────── */
@media (max-width: 767px) {
  .calc-panel {
    border-radius: 16px;
    margin: 0 -4px;
  }
  .calc-panel__top {
    padding: 1.25rem 1.25rem 1rem;
  }
  /* Inputs en grid 2×2 en móvil */
  .calc-inputs-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 1.25rem;
    align-items: start;
  }
  .cib-divider { display: none; }
  .cib-field { padding: 0; flex: unset; }
  .cib-field--sm,
  .cib-field--gender { flex: unset; }
  .cib-input { font-size: 1.125rem; }
  /* Botón full-width debajo del grid */
  .cib-btn {
    grid-column: 1 / -1;
    width: 100%; margin-left: 0;
    padding: 13px 20px; font-size: 1rem;
  }
  /* Gender pills más compactas */
  .gender-option { padding: 8px 6px; font-size: 0.8125rem; }
  /* Subrow apilado */
  .calc-subrow { flex-direction: column; align-items: center; gap: 10px; }
  .cp-trust { flex-wrap: wrap; }
  /* Resultado: gauge encima, detalle abajo */
  .res-col-gauge { padding: 1.5rem 1rem; }
  .res-col-detail { padding: 1.25rem; gap: 0.875rem; }
  /* Placeholder más compacto */
  .result-placeholder { padding: 2rem 1.25rem; min-height: 180px; }
  .rp-score { font-size: 2.25rem; }
  .rp-gauge { display: none; }
  /* Hero headline */
  .hero-section > div { padding-top: 2rem; padding-bottom: 2rem; }
  /* Tables: horizontal scroll within their containers */
  .res-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
}
/* Trust */
.cp-trust {
  display: flex; align-items: center; gap: 5px;
  font-size: 0.6875rem; color: var(--text-muted);
}
.cp-trust-dot { opacity: 0.35; }
/* BOTTOM: resultado */
.calc-panel__bottom {
  background: var(--surface);
  flex: 1;
}
/* Unit toggle field */
.cib-field--units { flex: 0 0 auto; }
@media (max-width: 767px) {
  .cib-field--units {
    grid-column: 1 / -1;
    justify-self: end;
  }
}
/* Options bar: gender + units on their own row */
.calc-options-bar {
  display: flex; align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.875rem; padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.calc-options-bar .cib-field { padding: 0; flex: 0 0 auto; }
/* RESULT PLACEHOLDER */
.result-placeholder {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 2.5rem 1rem;
  min-height: 220px;
}
.rp-gauge { opacity: 0.25; margin-bottom: 0.5rem; }
.rp-score {
  font-size: 3rem; font-weight: 800;
  letter-spacing: -0.05em; line-height: 1;
  color: var(--border-strong); margin-bottom: 0.5rem;
}
.rp-label {
  font-size: 0.9375rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 0.375rem;
}
.rp-desc {
  font-size: 0.8125rem; color: var(--text-muted);
  line-height: 1.6; max-width: 380px;
}
/* RESULTS layout: gauge izq + detalle der */
#results { display: block; }
.res-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
}
@media (max-width: 640px) {
  .res-layout { grid-template-columns: 1fr; }
}
.res-col-gauge {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; text-align: center;
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--border);
}
/* Gauge SVG scales down on narrow screens */
.res-col-gauge svg { max-width: 100%; height: auto; }
@media (max-width: 640px) {
  .res-col-gauge { border-right: none; border-bottom: 1px solid var(--border); padding: 1.5rem 1rem; }
}
.res-col-detail {
  display: flex; flex-direction: column; gap: 1rem;
  padding: 1.5rem;
}
/* Chart wrapper gives canvas a fixed height so Chart.js can render properly */
.bmi-chart-wrap {
  position: relative;
  width: 100%;
  height: 110px;
}
.bmi-chart-wrap canvas { display: block; }
.res-score {
  font-size: 3.5rem; font-weight: 800;
  letter-spacing: -0.04em; line-height: 1;
  color: var(--text-primary); margin-bottom: 0.2rem;
}
.res-category { font-size: 1rem; font-weight: 700; margin-bottom: 0.15rem; }
.res-category-desc { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.75rem; }
.res-actions { display: flex; gap: 0.5rem; }
.res-card { border-radius: 10px; padding: 0.875rem; transition: all 0.3s ease; }
.res-card-msg {
  font-size: 0.8125rem; line-height: 1.6;
  color: var(--text-secondary); margin-bottom: 0.625rem;
}
.res-card-metrics {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
  padding-top: 0.625rem; border-top: 1px solid rgba(0,0,0,0.08);
}
.dark .res-card-metrics { border-top-color: rgba(255,255,255,0.06); }
.res-metric-label {
  font-size: 0.625rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--text-muted); margin-bottom: 2px;
}
.res-metric-value { font-size: 0.875rem; font-weight: 700; color: var(--text-primary); }
.res-metric-goal { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; }
.res-rangebar-label {
  font-size: 0.625rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--text-muted); margin-bottom: 0.5rem;
}
/* CALCULATOR CARD */
.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  width: 100%;
}
@media(min-width:640px){ .calc-card { padding: 2.75rem; } }
@media(min-width:1024px){ .calc-card { padding: 3rem; } }
/* SEGMENTED UNIT TOGGLE */
.unit-toggle {
  display: inline-flex;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px; gap: 2px;
}
.unit-btn {
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem; font-weight: 500;
  cursor: pointer; color: var(--text-muted);
  transition: all 0.18s ease;
  border: none; background: transparent;
  white-space: nowrap; user-select: none;
  font-family: inherit; letter-spacing: -0.01em;
}
.unit-btn.active {
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  font-weight: 700;
  border: 1px solid var(--border);
}
.unit-btn:hover:not(.active){ color: var(--text-secondary); background: rgba(0,0,0,0.04); }
.dark .unit-btn:hover:not(.active){ background: rgba(255,255,255,0.06); }
/* FORM */
.form-label {
  display: block;
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 5px;
}
.form-input {
  width: 100%;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 16px;
  font-size: 1.125rem; font-weight: 600;
  color: var(--text-primary); font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  -webkit-appearance: none; appearance: none;
  line-height: 1.4;
}
.form-input::placeholder { color: var(--text-muted); font-weight: 400; font-size: 1rem; }
.form-input:focus {
  outline: none; border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.dark .form-input { background: var(--surface-3); border-color: var(--border); color: var(--text-primary); }
.dark .form-input:focus { background: var(--surface-2); box-shadow: 0 0 0 3px rgba(59,130,246,0.2); }
/* GENDER PILLS */
.gender-option {
  flex: 1; display: flex; align-items: center; justify-content: center;
  gap: 5px; padding: 6px 8px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer; font-size: 0.8125rem; font-weight: 500;
  color: var(--text-muted); background: var(--surface-2);
  transition: all 0.15s ease; user-select: none; white-space: nowrap;
}
.gender-option:hover:not(.selected) { border-color: var(--border-strong); color: var(--text-secondary); }
/* Hombre seleccionado — azul */
#gMale.selected {
  border-color: #2563eb; background: #eff6ff;
  color: #1d4ed8; font-weight: 700;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
/* Mujer seleccionada — rosa/fucsia */
#gFemale.selected {
  border-color: #db2777; background: #fdf2f8;
  color: #be185d; font-weight: 700;
  box-shadow: 0 0 0 3px rgba(219,39,119,0.1);
}
.dark #gMale.selected   { background: rgba(37,99,235,0.15);  border-color: #3b82f6; color: #93c5fd; }
.dark #gFemale.selected { background: rgba(219,39,119,0.15); border-color: #ec4899; color: #f9a8d4; }
/* Climate pills */
#climNormal.selected {
  border-color: #2563eb; background: #eff6ff;
  color: #1d4ed8; font-weight: 700;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
#climHot.selected {
  border-color: #ea580c; background: #fff7ed;
  color: #c2410c; font-weight: 700;
  box-shadow: 0 0 0 3px rgba(234,88,12,0.1);
}
.dark #climNormal.selected { background: rgba(37,99,235,0.15);  border-color: #3b82f6; color: #93c5fd; }
.dark #climHot.selected    { background: rgba(234,88,12,0.15);  border-color: #f97316; color: #fdba74; }
/* PRIMARY BUTTON */
.btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 16px 24px;
  background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius);
  font-size: 1rem; font-weight: 700; letter-spacing: -0.02em;
  cursor: pointer; font-family: inherit;
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
  box-shadow: 0 1px 2px rgba(37,99,235,.25), 0 4px 16px rgba(37,99,235,.22);
  position: relative; overflow: hidden;
}
.btn-primary::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, transparent 50%);
  pointer-events: none;
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 2px 4px rgba(37,99,235,.3), 0 8px 24px rgba(37,99,235,.28);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); box-shadow: none; }
/* GHOST BUTTON */
.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 0.8125rem; font-weight: 500;
  color: var(--text-secondary); background: var(--surface);
  cursor: pointer; transition: all 0.15s ease; font-family: inherit;
}
.btn-ghost:hover { border-color: var(--border-strong); color: var(--text-primary); background: var(--surface-2); }
.dark .btn-ghost { background: var(--surface-2); }
.dark .btn-ghost:hover { background: var(--surface-3); }
/* GAUGE SVG */
.gauge-arc { transition: stroke-dashoffset 1.2s cubic-bezier(0.16,1,0.3,1); }
.gauge-needle { transition: transform 1.2s cubic-bezier(0.16,1,0.3,1); }
/* BMI SCORE ANIMATION */
@keyframes scoreIn {
  0%   { opacity: 0; transform: scale(0.88) translateY(4px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}
.number-pop { animation: scoreIn 0.5s cubic-bezier(0.22,1,0.36,1) both; }
/* CATEGORY COLORS */
.cat-underweight { color: #2563eb; }
.cat-normal      { color: #16a34a; }
.cat-overweight  { color: #d97706; }
.cat-obese1      { color: #ea580c; }
.cat-obese2      { color: #dc2626; }
.cat-obese3      { color: #9333ea; }
.bg-cat-underweight { background: #eff6ff; border-color: #bfdbfe; }
.bg-cat-normal      { background: #f0fdf4; border-color: #bbf7d0; }
.bg-cat-overweight  { background: #fffbeb; border-color: #fde68a; }
.bg-cat-obese1      { background: #fff7ed; border-color: #fed7aa; }
.bg-cat-obese2      { background: #fef2f2; border-color: #fecaca; }
.bg-cat-obese3      { background: #faf5ff; border-color: #e9d5ff; }
/* Dark mode category card backgrounds */
.dark .bg-cat-underweight { background: rgba(37,99,235,0.13);  border-color: rgba(59,130,246,0.4); }
.dark .bg-cat-normal      { background: rgba(22,163,74,0.13);  border-color: rgba(74,222,128,0.4); }
.dark .bg-cat-overweight  { background: rgba(217,119,6,0.13);  border-color: rgba(252,211,77,0.4); }
.dark .bg-cat-obese1      { background: rgba(234,88,12,0.13);  border-color: rgba(249,115,22,0.4); }
.dark .bg-cat-obese2      { background: rgba(220,38,38,0.13);  border-color: rgba(239,68,68,0.4); }
.dark .bg-cat-obese3      { background: rgba(147,51,234,0.13); border-color: rgba(192,132,252,0.4); }
/* Dark mode category text — keep vivid */
.dark .cat-underweight { color: #93c5fd; }
.dark .cat-normal      { color: #86efac; }
.dark .cat-overweight  { color: #fcd34d; }
.dark .cat-obese1      { color: #fdba74; }
.dark .cat-obese2      { color: #fca5a5; }
.dark .cat-obese3      { color: #d8b4fe; }
/* BMI RANGE BAR */
.range-bar-wrap { position: relative; height: 8px; border-radius: 99px; overflow: visible; }
.bmi-marker {
  position: absolute; top: 50%;
  transform: translate(-50%,-50%);
  transition: left 0.9s cubic-bezier(0.16,1,0.3,1); z-index: 2;
}
.bmi-marker-dot {
  width: 18px; height: 18px;
  background: #0f172a; border: 2.5px solid #fff; border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0,0,0,.15), 0 2px 8px rgba(0,0,0,.2);
}
.dark .bmi-marker-dot { background: #f0f6fc; border-color: #0d1117; }
/* FAQ */
.faq-content { overflow: hidden; height: 0; transition: height 0.35s cubic-bezier(0.16,1,0.3,1); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
/* Reset browser button defaults + hover */
.faq-item > button, .faq-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s ease, color 0.15s ease;
}
.faq-item > button:hover { background: var(--surface-2); }
.faq-item > button[aria-expanded="true"] { background: var(--accent-light); }
.dark .faq-item > button:hover { background: var(--surface-3); }
.dark .faq-item > button[aria-expanded="true"] { background: rgba(37,99,235,0.12); }
/* CARD */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 1.5rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.card-hover:hover {
  box-shadow: var(--shadow-lg); transform: translateY(-2px);
  border-color: var(--border-strong);
}
/* Focus visible for accessibility */
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px;
}
/* SECTION DIVIDER */
.section-divider { height: 1px; background: var(--border); }
/* THEME TOGGLE */
.theme-toggle {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent; cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}
.theme-toggle:hover { background: var(--surface-2); color: var(--text-primary); border-color: var(--border-strong); }
/* LANGUAGE TOGGLE */
.lang-btn {
  height: 34px; min-width: 38px; padding: 0 8px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: transparent; cursor: pointer; color: var(--text-secondary);
  font-size: 0.6875rem; font-weight: 700; font-family: inherit;
  letter-spacing: 0.06em; transition: all 0.15s ease;
}
.lang-btn:hover { background: var(--surface-2); color: var(--text-primary); border-color: var(--border-strong); }
/* TRUST BADGE */
.trust-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.75rem; font-weight: 500;
  color: var(--accent); background: var(--accent-light);
  border: 1px solid var(--accent-muted);
  padding: 4px 10px; border-radius: 99px; letter-spacing: 0.01em;
}
/* SCROLLBAR */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 99px; }
/* PRINT */
@media print {
  header, #cta-section, footer, .no-print { display: none !important; }
  #results { display: block !important; }
  body { background: #fff; color: #000; }
}
/* TOAST */
#toast {
  position: fixed; bottom: 5rem; left: 50%;
  transform: translateX(-50%) translateY(8px); z-index: 60;
  background: var(--text-primary); color: var(--surface);
  font-size: 0.8125rem; font-weight: 500;
  padding: 10px 16px; border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 8px;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
/* SECTION LABEL */
.section-label {
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--accent);
}
/* FONT TABULAR */
.font-tabular { font-variant-numeric: tabular-nums; }
/* INPUT NUMBER — hide arrows */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; }
input[type=number] { -moz-appearance: textfield; }
/* MOBILE CTA */
#mobileCTA {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 40;
  background: var(--surface); border-top: 1px solid var(--border);
  padding: 12px 16px;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.08);
}
/* SELECTION COLOR */
::selection { background: var(--accent-muted); color: var(--text-primary); }
/* SMOOTH ANCHOR OFFSET for sticky nav */
[id] { scroll-margin-top: 72px; }
/* ============================================================
   MULTI-CALCULATOR NAV
   ============================================================ */
.calc-nav {
  display: flex; align-items: center; gap: 2px;
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none; flex: 1; padding: 0 4px;
}
.calc-nav::-webkit-scrollbar { display: none; }
.calc-nav-link {
  display: inline-block; padding: 5px 10px; border-radius: 6px;
  font-size: 0.8125rem; font-weight: 500;
  color: var(--text-secondary); white-space: nowrap;
  text-decoration: none; transition: all 0.15s ease;
}
/* HAMBURGER BUTTON */
.nav-hamburger {
  display: none;
  width: 34px; height: 34px;
  align-items: center; justify-content: center;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: transparent; cursor: pointer;
  color: var(--text-secondary); flex-shrink: 0;
  transition: all 0.15s ease;
}
.nav-hamburger:hover { background: var(--surface-2); color: var(--text-primary); border-color: var(--border-strong); }
.nav-hamburger .icon-close { display: none; }
.nav-hamburger[aria-expanded="true"] .icon-open { display: none; }
.nav-hamburger[aria-expanded="true"] .icon-close { display: block; }
.calc-nav-link:hover { color: var(--text-primary); background: var(--surface-2); }
.calc-nav-link.active { color: var(--accent); background: var(--accent-light); font-weight: 600; }
/* ─── MOBILE NAV HAMBURGER DROPDOWN ─────────────── */
@media (max-width: 767px) {
  .nav-hamburger { display: flex; }
  .calc-nav {
    position: absolute;
    top: 60px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    padding: 0 1rem; max-height: 0; overflow: hidden;
    transition: max-height 0.28s cubic-bezier(0.16,1,0.3,1), padding 0.25s ease;
    z-index: 49;
    -webkit-mask-image: none; mask-image: none;
  }
  .dark .calc-nav { box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
  .calc-nav.open { max-height: 420px; padding: 0.5rem 1rem; }
  .calc-nav-link {
    padding: 0.625rem 0.75rem; font-size: 0.9375rem;
    border-radius: 8px; display: block;
    border-bottom: 1px solid var(--border);
    white-space: normal;
  }
  .calc-nav-link:last-child { border-bottom: none; }
  .navbar .lang-btn { margin-left: auto; }
}
/* TOOLS GRID (sección "otras herramientas") */
.tools-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  justify-content: center;
}
.tool-card {
  display: flex; flex-direction: column; gap: 0.5rem;
  flex: 1 1 185px;
  max-width: 230px;
  padding: 1.125rem 1.25rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); text-decoration: none;
  transition: all 0.18s ease;
}
.tool-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.tool-card-icon {
  width: 34px; height: 34px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-light); color: var(--accent);
}
.tool-card-name { font-size: 0.9375rem; font-weight: 600; color: var(--text-primary); }
.tool-card-desc { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; }
/* ACTIVITY SELECTOR */
.activity-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}
.activity-btn {
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 3px;
  padding: 12px 6px 10px;
  border: 1.5px solid var(--border);
  border-radius: 12px; font-family: inherit;
  cursor: pointer; transition: all 0.18s ease;
  background: var(--surface-2); color: var(--text-muted);
  white-space: normal;
}
.activity-btn .act-emoji { font-size: 1.375rem; line-height: 1; margin-bottom: 2px; }
.activity-btn .act-name  { font-size: 0.8rem; font-weight: 600; color: inherit; }
.activity-btn .act-sub   { font-size: 0.6375rem; opacity: 0.7; }
.activity-btn:hover:not(.selected) {
  border-color: var(--border-strong);
  background: var(--surface-3);
  color: var(--text-secondary);
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}
.activity-btn.selected {
  border: 2px solid var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  box-shadow: 0 3px 12px rgba(37,99,235,0.18);
  transform: translateY(-1px);
}
/* RESULTS TABLE */
.res-table { width: 100%; border-collapse: collapse; }
.res-table th {
  font-size: 0.625rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-muted);
  padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.res-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 0.875rem; color: var(--text-secondary); vertical-align: middle; }
.res-table tr:last-child td { border-bottom: none; }
.res-table .td-val { font-weight: 700; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.res-table tr.highlighted td { background: var(--accent-light); }
.res-table tr.highlighted .td-val { color: var(--accent); }
.dark .res-table tr.highlighted td { background: rgba(59,130,246,0.12); }
.dark .res-table tr.highlighted .td-val { color: #93c5fd; }
/* SIMPLE RESULT LAYOUT (páginas sin gauge) */
.res-simple { padding: 1.75rem 1.5rem; display: flex; flex-direction: column; gap: 1.25rem; }
.res-big { text-align: center; padding-bottom: 1.25rem; border-bottom: 1px solid var(--border); }
.res-big-value {
  font-size: 4rem; font-weight: 800; letter-spacing: -0.05em;
  line-height: 1; color: var(--text-primary); font-variant-numeric: tabular-nums;
}
.res-big-unit { font-size: 1.25rem; font-weight: 500; color: var(--text-muted); margin-left: 4px; }
.res-big-label { font-size: 0.875rem; color: var(--text-secondary); margin-top: 0.375rem; }
.res-cards-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media (max-width: 480px) {
  .res-cards-grid { grid-template-columns: 1fr; }
  .bmi-chart-wrap { height: 85px; }
  .activity-grid { gap: 5px; }
  .activity-btn { padding: 10px 4px 8px; }
}
.res-mini-card {
  background: var(--surface-3); border-radius: 10px; padding: 0.875rem;
}
.res-mini-label {
  font-size: 0.625rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-muted); margin-bottom: 4px;
}
.res-mini-value { font-size: 1.125rem; font-weight: 700; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.res-mini-sub { font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }
/* STATUS BADGES en tabla IMC — dark mode */
.dark .badge-underweight { background: rgba(37,99,235,0.15) !important;  color: #93c5fd !important; border-color: rgba(59,130,246,0.4) !important; }
.dark .badge-normal      { background: rgba(22,163,74,0.15)  !important; color: #86efac !important; border-color: rgba(74,222,128,0.4) !important; }
.dark .badge-overweight  { background: rgba(217,119,6,0.15)  !important; color: #fcd34d !important; border-color: rgba(252,211,77,0.4) !important; }
.dark .badge-obese1      { background: rgba(234,88,12,0.15)  !important; color: #fdba74 !important; border-color: rgba(249,115,22,0.4) !important; }
.dark .badge-obese2      { background: rgba(220,38,38,0.15)  !important; color: #fca5a5 !important; border-color: rgba(239,68,68,0.4) !important; }
.dark .badge-obese3      { background: rgba(147,51,234,0.15) !important; color: #d8b4fe !important; border-color: rgba(192,132,252,0.4) !important; }
/* ICON BACKGROUNDS — light-mode base + dark-mode overrides */
.icon-bg-blue   { background: #eff6ff; }
.icon-bg-green  { background: #ecfdf5; }
.icon-bg-orange { background: #fff7ed; }
.icon-bg-red    { background: #fef2f2; }
.dark .icon-bg-blue   { background: rgba(37,99,235,0.15) !important; }
.dark .icon-bg-green  { background: rgba(22,163,74,0.15)  !important; }
.dark .icon-bg-orange { background: rgba(234,88,12,0.15)  !important; }
.dark .icon-bg-red    { background: rgba(220,38,38,0.15)  !important; }
/* HOT / WARNING ALERT CARD */
.hot-alert {
  border: 1px solid #fdba74;
  background: #fff7ed;
  color: #9a3412;
}
.dark .hot-alert {
  border-color: rgba(251,146,60,0.35) !important;
  background: rgba(234,88,12,0.1) !important;
  color: #fdba74 !important;
}
.dark .hot-alert p { color: #fdba74; }
/* FAQ COMPARISON CARDS */
.faq-compare-blue {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}
.faq-compare-blue p.font-semibold { color: #1d4ed8; }
.faq-compare-blue ul { color: #3b82f6; }
.faq-compare-red {
  background: #fef2f2;
  border: 1px solid #fecaca;
}
.faq-compare-red p.font-semibold { color: #991b1b; }
.faq-compare-red ul { color: #ef4444; }
.dark .faq-compare-blue {
  background: rgba(37,99,235,0.1) !important;
  border-color: rgba(59,130,246,0.25) !important;
}
.dark .faq-compare-blue p.font-semibold { color: #93c5fd; }
.dark .faq-compare-blue ul { color: #93c5fd; }
.dark .faq-compare-red {
  background: rgba(220,38,38,0.1) !important;
  border-color: rgba(239,68,68,0.25) !important;
}
.dark .faq-compare-red p.font-semibold { color: #fca5a5; }
.dark .faq-compare-red ul { color: #fca5a5; }
/* PURPLE CITATION / HIGHLIGHT CARD */
.cite-purple {
  background: #faf5ff;
  border: 1px solid #e9d5ff;
}
.cite-purple .cite-title { color: #7e22ce; }
.cite-purple .cite-body  { color: #6b21a8; }
.dark .cite-purple {
  background: rgba(147,51,234,0.1) !important;
  border-color: rgba(192,132,252,0.25) !important;
}
.dark .cite-purple .cite-title { color: #d8b4fe; }
.dark .cite-purple .cite-body  { color: #c4b5fd; }
/* SELECT INPUT */
.cib-select {
  width: 100%; border: none; border-bottom: 2px solid var(--border);
  background: transparent; font-size: 1.125rem; font-weight: 600;
  color: var(--text-primary); font-family: inherit; padding: 6px 0 8px;
  cursor: pointer; outline: none; -webkit-appearance: none; appearance: none;
}
.cib-select:focus { border-bottom-color: var(--accent); }
.dark .cib-select option { background: var(--surface-2); }

/* ======= SITE FOOTER ======= */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 0 0;
  margin-top: 0;
}
.footer-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr; }
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  margin-bottom: 0.75rem;
}
.footer-logo-icon {
  width: 2rem; height: 2rem;
  background: var(--accent-light);
  border: 1px solid var(--accent-muted);
  border-radius: 0.5rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.footer-logo-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.footer-desc {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 22rem;
}
.footer-nav-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}
.footer-nav-list {
  list-style: none;
  padding: 0; margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-nav-list a {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-nav-list a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  align-items: center;
  text-align: center;
}
@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}
.footer-bottom p { font-size: 0.75rem; color: var(--text-muted); }