/* ============================================
   Pulso Digital — Landing Mérida
   Paleta global pulsodigitalweb.mx
   Mobile-first
   ============================================ */

:root {
  --clr-bg: #0a0a1a;
  --clr-surface: #12122a;
  --clr-surface-2: #1a1a3e;
  --clr-primary: #00d4ff;
  --clr-primary-dark: #0099cc;
  --clr-accent: #cc4400;
  --clr-accent-hover: #e05500;
  --clr-text: #f0f0f5;
  --clr-text-muted: #b8b8d0;
  --clr-border: rgba(255,255,255,0.08);
  --clr-glow: rgba(0,212,255,0.15);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 30px rgba(0,212,255,0.1);
}

/* ---------- Reset ligero ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-text);
  background-color: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--clr-text);
}

h1 {
  font-size: clamp(2.25rem, 6vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 16px;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: var(--clr-primary);
  text-decoration: none;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--clr-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--clr-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--clr-surface-2);
  border-radius: 999px;
  border: 3px solid var(--clr-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--clr-primary-dark);
}

/* ---------- Utilidades ---------- */
.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: 24px;
}

section {
  padding-block: 48px;
}

/* ---------- Fade-in (JS) ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  padding: 16px 32px;
  font-family: var(--font);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.2;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--clr-accent);
  color: #fff;
  border: none;
  box-shadow: 0 4px 24px rgba(255,107,53,0.5), 0 0 40px rgba(255,107,53,0.2);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--clr-accent-hover);
  color: #fff;
  box-shadow: 0 8px 36px rgba(255,107,53,0.6), 0 0 50px rgba(255,107,53,0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  box-shadow: var(--shadow-glow);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #0e7a3a;
  color: #fff;
}

.btn-whatsapp:hover {
  background: #0a6630;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 10, 26, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--clr-border);
}

.nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--clr-text);
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
}

.logo-pulso { color: var(--clr-text); }
.logo-digital { color: var(--clr-primary); }
.logo-ecg { width: 28px; height: 16px; margin-left: 4px; }
.logo-ecg path {
  fill: none;
  stroke: var(--clr-primary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  animation: ecgDraw 2s ease-in-out infinite;
}

@keyframes ecgDraw {
  0% { stroke-dashoffset: 60; }
  40% { stroke-dashoffset: 0; }
  60% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -60; }
}

.nav-links {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  background-color: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: var(--shadow);
  padding-block-end: 16px;
}

.nav-links.open {
  display: flex;
}

.nav-links a {
  width: 100%;
  padding: 14px 24px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  transition: color var(--transition), background-color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--clr-primary);
  background-color: var(--clr-glow);
}

.nav-cta {
  background: var(--clr-accent);
  color: #fff !important;
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 600;
  border: none;
}

.nav-links a.nav-cta:hover,
.nav-links a.nav-cta:focus-visible {
  background: var(--clr-accent-hover);
  color: #fff;
  box-shadow: 0 4px 15px rgba(255,107,53,0.4);
}

.hamburger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--transition);
}

.hamburger:hover {
  border-color: var(--clr-primary);
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
#hero {
  padding-block: 64px;
  background:
    radial-gradient(
      1200px 500px at 80% -10%,
      var(--clr-glow) 0%,
      transparent 60%
    ),
    var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  text-align: center;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-inner h1 {
  max-width: 22ch;
  margin-bottom: 24px;
}

.hero-inner .subheadline {
  max-width: 60ch;
  color: var(--clr-text-muted);
  font-size: 1.15rem;
  margin-bottom: 32px;
}

.hero-inner .btn {
  margin-bottom: 16px;
}

.hero-inner .sub-cta {
  margin-bottom: 40px;
  color: var(--clr-text-muted);
  font-size: 0.95rem;
}

/* ---------- Problema ---------- */
#problema .container {
  max-width: 760px;
}

#problema h2 {
  margin-bottom: 24px;
}

#problema p {
  color: var(--clr-text-muted);
}

.highlight {
  background-color: var(--clr-surface-2);
  border-left: 4px solid var(--clr-primary);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 24px;
  color: var(--clr-text);
  box-shadow: var(--shadow-glow);
}

.highlight strong {
  color: var(--clr-primary);
}

/* ---------- Solución: cards ---------- */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

.card {
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-glow);
}

.card h3 {
  margin-bottom: 12px;
  color: var(--clr-primary);
}

.card p {
  margin-bottom: 0;
  color: var(--clr-text-muted);
}

/* ---------- Diferenciadores ---------- */
.diferencia-inner {
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.diferencia-inner h2 {
  margin-bottom: 32px;
}

.diferencia-lista li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-block: 14px;
}

.diferencia-lista li + li {
  border-top: 1px solid var(--clr-border);
}

.diferencia-lista li::before {
  content: "\2713";
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--clr-glow);
  color: var(--clr-primary);
  font-weight: 700;
  font-size: 0.85rem;
}

.diferencia-lista li span {
  color: var(--clr-text-muted);
}

/* ---------- Proceso: pasos ---------- */
#proceso .container {
  max-width: 860px;
}

#proceso h2 {
  margin-bottom: 32px;
}

.steps {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.step {
  position: relative;
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--clr-glow);
  color: var(--clr-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.step-number::before {
  content: counter(step);
  counter-increment: step;
}

.step h3 {
  margin-bottom: 8px;
}

.step p {
  margin-bottom: 0;
  color: var(--clr-text-muted);
}

/* ---------- CTA final ---------- */
.cta-box {
  text-align: center;
  background-color: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-glow);
}

.cta-box h2 {
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--clr-text-muted);
  max-width: 60ch;
  margin-inline: auto;
  margin-bottom: 32px;
}

.cta-box .btn-primary:hover,
.cta-box .btn-primary:focus-visible {
  background: var(--clr-accent-hover);
  color: #fff;
  box-shadow: 0 8px 36px rgba(255,107,53,0.6), 0 0 50px rgba(255,107,53,0.3);
}

/* ---------- FAQ ---------- */
#faq .container {
  max-width: 760px;
}

#faq h2 {
  margin-bottom: 32px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  color: var(--clr-text);
}

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

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--clr-primary);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin: 0;
  padding: 0 24px 24px;
  color: var(--clr-text-muted);
}

/* ---------- Contacto ---------- */
#contacto {
  background-color: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  text-align: center;
}

.contacto-inner {
  max-width: 700px;
}

.contacto-inner h2 {
  margin-bottom: 16px;
}

.contacto-inner p {
  color: var(--clr-text-muted);
  margin-bottom: 40px;
}

/* ---------- Breakpoints ---------- */
@media (min-width: 768px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .diferencia-inner,
  .cta-box {
    padding: 64px;
  }
}

@media (min-width: 992px) {
  .hamburger {
    display: none;
  }

  .nav-links {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 24px;
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
    padding-block-end: 0;
  }

  .nav-links a {
    width: auto;
    padding: 8px 12px;
  }

  .nav-links a:hover,
  .nav-links a:focus-visible {
    background: transparent;
  }

  .nav-links a.nav-cta:hover,
  .nav-links a.nav-cta:focus-visible {
    background: var(--clr-accent-hover);
    box-shadow: 0 4px 15px rgba(255,107,53,0.4);
  }

  .nav-cta {
    margin-top: 0;
  }

  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Footer ===== */
.footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: 40px 0 24px;
  margin-top: 80px;
}
.footer .container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand p {
  color: var(--clr-text-muted);
  font-size: 0.9rem;
  max-width: 280px;
  margin-top: 8px;
}
.footer-links h3 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--clr-text);
  margin-bottom: 12px;
}
.footer-links ul {
  list-style: none;
  padding: 0;
}
.footer-links li {
  margin-bottom: 8px;
}
.footer-links a {
  color: var(--clr-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--clr-primary);
}
.footer-bottom {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--clr-border);
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 0.8rem;
}

@media (max-width: 600px) {
  .footer-inner {
    flex-direction: column;
    gap: 20px;
  }
}