/* ============================================================
   dungo.ai — Landing comercial
   Variante CLARA del tema mono: superficies en blanco/gris.
   Se invierten hero, nav, techbar, comparativa, CTA final y footer.
   El mockup del teléfono y el diagrama se mantienen en negro a propósito:
   son las anclas gráficas del tema (bloque negro sobre blanco).
   Los matices solo aparecen en acentos: titular, eyebrows, stats, chips,
   iconos, diagrama, métricas y focos.
   Tipografía: Sora (títulos) / Inter (cuerpo)
   ============================================================ */

:root {
  /* Base monocromática */
  --navy-950: #000000;
  --navy-900: #0d0d0d;
  --navy-800: #1f1f1f;
  --navy-700: #2e2e2e;
  --ink: #0a0a0a;
  --ink-soft: #666666;
  --bg: #ffffff;
  --bg-alt: #f5f5f5;
  --line: #e4e4e4;

  /* Acento base del tema (matiz principal) */
  --green-500: #3b82f6;
  --green-400: #60a5fa;
  --green-600: #2563eb;
  --green-100: #eef4ff;

  /* Espectro de matices — uso puntual, nunca en superficies */
  --a-blue: #3b82f6;
  --a-violet: #8b5cf6;
  --a-green: #22c55e;
  --a-amber: #f59e0b;
  --a-pink: #ec4899;
  --a-red: #ef4444;

  /* Variantes legibles sobre superficies claras (todas >= 4.5:1 sobre --bg-alt).
     Los --a-* vivos solo se usan sobre negro o como tintes decorativos.
     El verde va más oscuro que el resto porque también se usa sobre el tinte
     verde de .compare-us, que baja el contraste del fondo. */
  --a-blue-ink: #1d4ed8;
  --a-violet-ink: #6d28d9;
  --a-green-ink: #146c34;
  --a-amber-ink: #b45309;
  --a-pink-ink: #be185d;
  --a-red-ink: #c81e1e;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.22);
  --font-head: 'Sora', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }

.container { width: min(1160px, 92%); margin-inline: auto; }
.narrow { max-width: 760px; }
.center { text-align: center; margin-inline: auto; }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 4.5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 700; }
h3 { font-size: 1.18rem; font-weight: 700; }

.lead { font-size: 1.13rem; color: var(--ink-soft); margin-top: 1rem; }
.accent { color: var(--green-500); }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-600);
  margin-bottom: 0.9rem;
}

.section { padding: clamp(4rem, 8vw, 6.5rem) 0; }
.section-alt { background: var(--bg-alt); }

/* ============ Botones ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-weight: 600;
  border-radius: 999px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-sm { padding: 0.55rem 1.2rem; font-size: 0.9rem; }
.btn-lg { padding: 0.95rem 1.9rem; font-size: 1rem; }
.btn-primary {
  background: #0a0a0a;
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.28);
}
.btn-primary:hover { box-shadow: 0 10px 28px rgba(139, 92, 246, 0.42); }
.btn-ghost {
  border: 1.5px solid rgba(10, 10, 10, 0.25);
  color: var(--ink);
}
.btn-ghost:hover { background: rgba(10, 10, 10, 0.05); }
.btn-ghost-dark {
  border: 1.5px solid var(--navy-800);
  color: var(--navy-900);
}
.btn-ghost-dark:hover { background: rgba(0, 0, 0, 0.05); }

/* ============ Nav ============ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 0.9rem 0;
  transition: background 0.25s ease, box-shadow 0.25s ease, padding 0.25s ease;
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
  padding: 0.6rem 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }

.logo { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); }
.logo-mark {
  height: 38px;
  width: auto;
  transition: opacity 0.15s ease;
}
.logo:hover .logo-mark { opacity: 0.82; }
.footer .logo-mark { height: 32px; }

.nav-links { display: flex; align-items: center; gap: 1.8rem; }
.nav-links a:not(.btn) {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.nav-links a:not(.btn):hover { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(139, 92, 246, 0.12), transparent 60%),
    linear-gradient(160deg, #ffffff 0%, #fbfbfb 55%, #f3f3f3 100%);
  color: var(--ink);
  padding: clamp(8rem, 14vw, 11rem) 0 clamp(4rem, 7vw, 6rem);
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  width: 600px; height: 600px;
  left: -200px; bottom: -300px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12), transparent 65%);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero .eyebrow { color: var(--green-600); }
.hero-sub {
  margin-top: 1.3rem;
  font-size: 1.13rem;
  color: var(--ink-soft);
  max-width: 34rem;
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2rem; }
.center-ctas { justify-content: center; }
.hero-trust {
  margin-top: 1.6rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* Mockup teléfono */
.hero-visual { position: relative; justify-self: center; }
.phone {
  width: min(370px, 88vw);
  background: #0a0a0a;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.phone-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  background: linear-gradient(135deg, #2a2a2a, #101010);
}
.phone-avatar {
  width: 38px; height: 38px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
}
.phone-name { font-weight: 700; font-size: 0.95rem; color: #fff; }
.phone-status { font-size: 0.75rem; color: #fff; opacity: 0.85; }
.phone-chat {
  padding: 1.1rem 0.9rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  background:
    radial-gradient(400px 300px at 70% 20%, rgba(59, 130, 246, 0.06), transparent),
    #0a0a0a;
}
.msg {
  max-width: 82%;
  padding: 0.6rem 0.85rem;
  font-size: 0.85rem;
  line-height: 1.45;
  border-radius: 14px;
}
.msg-in {
  align-self: flex-start;
  background: #1a1a1a;
  color: rgba(255, 255, 255, 0.92);
  border-bottom-left-radius: 4px;
}
.msg-out {
  align-self: flex-end;
  background: #303030;
  color: rgba(255, 255, 255, 0.95);
  border-bottom-right-radius: 4px;
}
.msg-typing {
  align-self: flex-end;
  background: #303030;
  display: inline-flex;
  gap: 4px;
  padding: 0.7rem 0.9rem;
  border-bottom-right-radius: 4px;
}
.msg-typing span {
  width: 6px; height: 6px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 50%;
  animation: typing 1.2s infinite;
}
.msg-typing span:nth-child(2) { animation-delay: 0.18s; }
.msg-typing span:nth-child(3) { animation-delay: 0.36s; }
@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-4px); opacity: 1; }
}

.chip {
  align-self: center;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #93b8fb;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  margin: 0.25rem 0;
}
.chip-dot {
  width: 6px; height: 6px;
  background: var(--a-blue);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.chip-success {
  color: #86efac;
  background: rgba(34, 197, 94, 0.16);
  border-color: rgba(34, 197, 94, 0.35);
}
.chip-success .chip-dot { background: var(--a-green); }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 currentColor; }
  50% { box-shadow: 0 0 0 5px transparent; }
}

.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: #fff;
  color: var(--ink);
  font-size: 0.75rem;
  line-height: 1.4;
  padding: 0.7rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  animation: floaty 5s ease-in-out infinite;
}
.float-card strong { font-size: 0.78rem; }
.float-icon { font-size: 1.1rem; }
.float-card-1 { top: 18%; right: -10%; }
.float-card-2 { bottom: 12%; left: -14%; animation-delay: 2.5s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ============ Barra tecnología ============ */
.techbar {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.1rem 0;
}
.techbar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem 2.5rem;
}
.techbar-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}
.techbar-item { font-size: 0.95rem; color: var(--ink-soft); }
.techbar-item strong { color: var(--ink); font-weight: 600; }

/* ============ Stats ============ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3.5rem;
}
.stat {
  text-align: center;
  padding: 1.8rem 1.2rem;
  background: var(--bg-alt);
  border-radius: var(--radius);
}
.stat-num {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--green-500);
  letter-spacing: -0.03em;
}
.stat-label { font-size: 0.9rem; color: var(--ink-soft); margin-top: 0.3rem; }

/* ============ Pasos ============ */
.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 1.5rem;
  align-items: start;
  margin-top: 3.5rem;
}
.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.7rem;
  box-shadow: var(--shadow-sm);
}
.step-num {
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  background: linear-gradient(135deg, var(--green-400), var(--green-600));
  border-radius: 12px;
  margin-bottom: 1.1rem;
}
.step h3 { margin-bottom: 0.5rem; }
.step p { font-size: 0.95rem; color: var(--ink-soft); }
.step-arrow {
  align-self: center;
  font-size: 1.6rem;
  color: var(--green-500);
  font-weight: 700;
}

/* ============ Diagrama ============ */
.diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 3.5rem;
  padding: 2.4rem 2rem;
  background: var(--navy-900);
  border-radius: var(--radius-lg);
}
.diagram-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.6rem;
  color: #fff;
  background: var(--navy-800);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 1rem 1.4rem;
  text-align: center;
}
.diagram-node span {
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.3;
  color: rgba(255, 255, 255, 0.8);
}
.diagram-node.sm { font-size: 1.2rem; padding: 0.7rem 1rem; }
.diagram-node.sm span { font-size: 0.72rem; }
.diagram-triage {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.22), rgba(59, 130, 246, 0.14));
  border-color: rgba(139, 92, 246, 0.45);
}
.diagram-specialists {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
}
.diagram-line {
  width: 36px; height: 2px;
  background: linear-gradient(90deg, var(--a-violet), var(--a-blue));
  border-radius: 2px;
  position: relative;
}
.diagram-line::after {
  content: '';
  position: absolute;
  right: -1px; top: -3px;
  border: 4px solid transparent;
  border-left-color: var(--a-blue);
}

/* ============ Cards features ============ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3.5rem;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.7rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(59, 130, 246, 0.4);
}
.card-icon {
  width: 52px; height: 52px;
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  background: var(--green-100);
  border-radius: 14px;
  margin-bottom: 1.1rem;
}
.card h3 { margin-bottom: 0.5rem; }
.card p { font-size: 0.95rem; color: var(--ink-soft); }

/* ============ Comparación ============ */
.section-dark {
  background:
    radial-gradient(900px 400px at 15% 0%, rgba(139, 92, 246, 0.09), transparent 60%),
    var(--bg-alt);
  color: var(--ink);
}
.section-dark .lead { color: var(--ink-soft); }
.section-dark .eyebrow { color: var(--green-600); }
.compare { margin-top: 3.5rem; display: flex; flex-direction: column; gap: 1rem; }
.compare-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.compare-them, .compare-us {
  border-radius: var(--radius);
  padding: 1.5rem 1.7rem;
}
.compare-them {
  background: #ffffff;
  border: 1px solid var(--line);
}
.compare-them h4 { color: #4a4a4a; font-size: 1rem; margin-bottom: 0.4rem; }
.compare-them p { color: var(--ink-soft); font-size: 0.9rem; }
.compare-us {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.38);
}
.compare-us h4 {
  color: var(--a-green-ink);
  font-size: 1rem;
  margin-bottom: 0.4rem;
}
.compare-us h4::before { content: '✓ '; }
.compare-us p { color: var(--ink-soft); font-size: 0.9rem; }

/* ============ Casos de uso ============ */
.case {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.7rem;
  box-shadow: var(--shadow-sm);
}
.case-tag {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green-600);
  background: var(--green-100);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  margin-bottom: 1rem;
}
.case h3 { margin-bottom: 0.8rem; }
.case p { font-size: 0.92rem; color: var(--ink-soft); margin-bottom: 0.8rem; }
.case-before strong { color: var(--a-red-ink); }
.case-after strong { color: var(--green-600); }
.case-metric {
  margin-top: auto;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--navy-900);
}
.case-metric span {
  display: block;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}

/* ============ Confianza ============ */
.trust {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
}
.trust h4 { font-size: 1rem; margin-bottom: 0.4rem; }
.trust h4::before { content: '● '; color: var(--green-500); font-size: 0.7rem; vertical-align: 2px; }
.trust p { font-size: 0.9rem; color: var(--ink-soft); }

/* ============ FAQ ============ */
.faq-list { margin-top: 3rem; display: flex; flex-direction: column; gap: 0.8rem; }
.faq {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 1.5rem;
  transition: border-color 0.2s ease;
}
.faq[open] { border-color: rgba(59, 130, 246, 0.45); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--green-500);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.faq[open] summary::after { transform: rotate(45deg); }
.faq p { padding: 0 0 1.3rem; color: var(--ink-soft); font-size: 0.95rem; }

/* ============ CTA final ============ */
.cta-final {
  background:
    radial-gradient(800px 400px at 50% 120%, rgba(139, 92, 246, 0.14), transparent 65%),
    linear-gradient(160deg, #ffffff, #fafafa);
  color: var(--ink);
  border-top: 1px solid var(--line);
}
.cta-final .lead { color: var(--ink-soft); }
.cta-final .btn-ghost-dark { border-color: rgba(10, 10, 10, 0.25); color: var(--ink); }
.cta-final .btn-ghost-dark:hover { background: rgba(10, 10, 10, 0.05); }
.cta-note { margin-top: 1.5rem; font-size: 0.88rem; color: var(--ink-soft); }

/* ============ Footer ============ */
.footer {
  background: #f0f0f0;
  color: var(--ink-soft);
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--line);
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-brand p {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
  max-width: 18rem;
}
.footer-col { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col h5 {
  font-family: var(--font-head);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
}
.footer-col a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--green-600); }
/* ============ Información legal de la empresa ============ */
.footer-legal {
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}
.footer-legal h5 {
  font-family: var(--font-head);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  margin-bottom: 0.7rem;
}
.footer-legal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.9fr 1.2fr;
  gap: 1.1rem 2rem;
}
.footer-legal-item dt {
  font-family: var(--font-head);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #9a9a9a;
  margin-bottom: 0.3rem;
}
.footer-legal-item dd {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.footer-legal strong { color: var(--ink); font-weight: 600; }
.footer-legal a { color: var(--ink-soft); transition: color 0.15s ease; }
.footer-legal a:hover { color: var(--green-600); }
.footer-domains {
  margin: 1.2rem 0 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--ink-soft);
}
.footer-legal + .footer-bottom { margin-top: 1.5rem; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

/* ============ Reveal on scroll ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .float-card, .chip-dot, .msg-typing span { animation: none; }
}

/* ============ Responsive ============ */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { margin-top: 2rem; }
  .float-card-1 { right: 0; }
  .float-card-2 { left: 0; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .step-arrow { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-legal-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .grid-3, .compare-row, .stats { grid-template-columns: 1fr; }
  .footer-legal-grid { grid-template-columns: 1fr; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .diagram { flex-direction: column; }
  .diagram-line { width: 2px; height: 28px; background: linear-gradient(180deg, var(--a-violet), var(--a-blue)); }
  .diagram-line::after { right: -3px; top: auto; bottom: -1px; border: 4px solid transparent; border-top-color: var(--a-blue); }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0; right: 0;
    height: 100dvh;
    width: min(320px, 80vw);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1.4rem;
    padding: 5.5rem 2rem 2rem;
    background: var(--bg);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.25s ease;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a:not(.btn) { font-size: 1.1rem; }
  .nav.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ============================================================
   MATICES DE COLOR
   Capa final del tema mono: la base es B/N y el color entra solo
   aquí, en acentos puntuales. Cada familia recorre el espectro
   para que el color se lea como matiz y no como paleta de marca.
   ============================================================ */

/* Titular destacado: el único degradado multicolor de la página */
.accent {
  background: linear-gradient(100deg, var(--a-violet) 0%, var(--a-blue) 45%, var(--a-green) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Stats: un matiz por métrica */
.stat:nth-child(1) .stat-num { color: var(--a-blue-ink); }
.stat:nth-child(2) .stat-num { color: var(--a-violet-ink); }
.stat:nth-child(3) .stat-num { color: var(--a-amber-ink); }
.stat:nth-child(4) .stat-num { color: var(--a-green-ink); }

/* Pasos: numeración en matices sucesivos */
.steps .step:nth-child(1) .step-num { background: var(--a-violet-ink); }
.steps .step:nth-child(3) .step-num { background: var(--a-blue-ink); }
.steps .step:nth-child(5) .step-num { background: var(--a-green-ink); }
.step-arrow { color: var(--ink-soft); }

/* Iconos de producto: tinte por card */
.card:nth-child(1) .card-icon { background: rgba(59, 130, 246, 0.12); }
.card:nth-child(2) .card-icon { background: rgba(139, 92, 246, 0.12); }
.card:nth-child(3) .card-icon { background: rgba(34, 197, 94, 0.12); }
.card:nth-child(4) .card-icon { background: rgba(245, 158, 11, 0.14); }
.card:nth-child(5) .card-icon { background: rgba(236, 72, 153, 0.12); }
.card:nth-child(6) .card-icon { background: rgba(239, 68, 68, 0.12); }

/* Especialistas del diagrama: un matiz por agente */
.diagram-specialists .diagram-node:nth-child(1) { border-color: rgba(59, 130, 246, 0.45); }
.diagram-specialists .diagram-node:nth-child(2) { border-color: rgba(139, 92, 246, 0.45); }
.diagram-specialists .diagram-node:nth-child(3) { border-color: rgba(34, 197, 94, 0.45); }
.diagram-specialists .diagram-node:nth-child(4) { border-color: rgba(245, 158, 11, 0.45); }

/* Casos: etiqueta por vertical */
.case:nth-child(1) .case-tag { color: var(--a-blue-ink); background: rgba(59, 130, 246, 0.1); }
.case:nth-child(2) .case-tag { color: var(--a-violet-ink); background: rgba(139, 92, 246, 0.1); }
.case:nth-child(3) .case-tag { color: var(--a-green-ink); background: rgba(34, 197, 94, 0.1); }
.case-after strong { color: var(--a-green-ink); }

/* Confianza: viñetas en espectro */
.trust:nth-child(1) h4::before { color: var(--a-blue-ink); }
.trust:nth-child(2) h4::before { color: var(--a-violet-ink); }
.trust:nth-child(3) h4::before { color: var(--a-green-ink); }
.trust:nth-child(4) h4::before { color: var(--a-amber-ink); }
.trust:nth-child(5) h4::before { color: var(--a-pink-ink); }
.trust:nth-child(6) h4::before { color: var(--a-red-ink); }

/* Foco visible en base monocromática */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--a-blue);
  outline-offset: 3px;
  border-radius: 4px;
}