/* ECGreaderPro — Shared design system
   --------------------------------------
   Aesthetic: editorial, warm paper, medical red accent,
   serif display + clean sans + mono.
*/

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=Instrument+Sans:ital,wght@0,400..700;1,400..700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --paper: #F3EEE3;
  --paper-alt: #EBE4D4;
  --paper-dim: #E0D7C2;
  --ink: #131110;
  --ink-soft: #3A332C;
  --ink-muted: #7A7166;
  --line: #D9D0BC;
  --line-soft: rgba(19, 17, 16, 0.08);
  --accent: #B52F1F;
  --accent-soft: rgba(181, 47, 31, 0.1);
  --success: #2E7D3E;

  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Instrument Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;

  --max: 1200px;
  --content: 780px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-image:
    radial-gradient(ellipse at 15% 5%, rgba(181, 47, 31, 0.025), transparent 45%),
    radial-gradient(ellipse at 85% 95%, rgba(19, 17, 16, 0.035), transparent 55%);
  min-height: 100vh;
  overflow-x: hidden;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

/* Bilingual display */
body:not(.lang-en) .lang-en { display: none !important; }
body.lang-en .lang-es { display: none !important; }

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  font-variation-settings: 'opsz' 144;
}

h1 {
  font-size: clamp(2.75rem, 8vw, 6rem);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.035em;
}

h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 400;
  letter-spacing: -0.025em;
}

h3 {
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 500;
  letter-spacing: -0.015em;
}

h4 {
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-body);
  letter-spacing: 0;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.2s, border-color 0.2s;
}

a:hover {
  color: var(--accent);
}

/* Labels + eyebrows */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  font-weight: 500;
}

.eyebrow::before {
  content: '';
  width: 1.75rem;
  height: 1px;
  background: var(--accent);
}

.label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* Container */
.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
}

.content {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 2rem;
}

/* =========  NAV  ========= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(243, 238, 227, 0.78);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--line-soft);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.125rem 2rem;
  max-width: var(--max);
  margin: 0 auto;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  border: none;
  color: var(--ink);
  font-variation-settings: 'opsz' 18;
}

.logo:hover {
  color: var(--ink);
}

.logo-mark {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  border: none;
  color: var(--ink-soft);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-links a:hover::after,
.nav-links a.current::after {
  transform: scaleX(1);
}

.nav-links a.current {
  color: var(--ink);
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.4rem 0.75rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: pointer;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  transition: all 0.2s;
  font-weight: 500;
}

.lang-toggle:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.lang-toggle .current-lang {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  border-radius: 2px;
}

/* =========  HERO  ========= */
.hero {
  padding: 5rem 0 3rem;
  position: relative;
}

.hero h1 {
  max-width: 13ch;
  margin-bottom: 2rem;
}

.hero-lead {
  max-width: 52ch;
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  line-height: 1.45;
  color: var(--ink-soft);
  margin-bottom: 2.5rem;
  font-weight: 400;
}

.hero-meta {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  margin-top: 2rem;
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.3); }
}

/* =========  ECG WAVE  ========= */
.ecg-wave {
  width: 100%;
  height: 140px;
  margin: 3rem 0 1rem;
  display: block;
}

.ecg-wave path.trace {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 3000;
  stroke-dashoffset: 3000;
  animation: draw 3.5s ease-out 0.3s forwards;
}

.ecg-wave path.grid {
  fill: none;
  stroke: var(--line);
  stroke-width: 0.5;
  opacity: 0.5;
}

@keyframes draw {
  to { stroke-dashoffset: 0; }
}

/* =========  SECTIONS  ========= */
.section {
  padding: 5rem 0;
  position: relative;
}

.section + .section {
  border-top: 1px solid var(--line-soft);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 3.5rem;
}

.section-head h2 {
  margin-top: 0.75rem;
}

.section-head p {
  margin-top: 1rem;
  font-size: 1.1rem;
  color: var(--ink-soft);
  line-height: 1.5;
  max-width: 42rem;
}

/* =========  FEATURE GRID  ========= */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 2rem;
}

.feature {
  background: var(--paper);
  padding: 2.25rem 2rem;
  transition: background 0.25s ease;
}

.feature:hover {
  background: var(--paper-alt);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
  letter-spacing: 0.12em;
  font-weight: 500;
}

.feature h3 {
  margin-bottom: 0.75rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.4rem;
  font-variation-settings: 'opsz' 24;
}

.feature p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 0;
}

/* =========  STEPS  ========= */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-top: 2rem;
}

.step {
  position: relative;
}

.step-num {
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 200;
  font-style: italic;
  color: var(--accent);
  line-height: 0.9;
  margin-bottom: 1.25rem;
  display: block;
  font-variation-settings: 'opsz' 144;
}

.step h3 {
  margin-bottom: 0.75rem;
  font-size: 1.3rem;
}

.step p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0;
}

/* =========  PRICING / RECARGA  ========= */
.pricing {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 2.5rem;
}

.price {
  background: var(--paper);
  padding: 2rem 1.75rem;
  text-align: left;
  position: relative;
  transition: background 0.25s;
}

.price:hover {
  background: var(--paper-alt);
}

.price.featured {
  background: var(--ink);
  color: var(--paper);
}

.price.featured .price-qty,
.price.featured .price-amount,
.price.featured .price-note {
  color: var(--paper);
}

.price.featured .price-label {
  color: var(--paper);
  opacity: 0.7;
}

.price-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 1rem;
}

.price-qty {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 300;
  line-height: 1;
  color: var(--ink);
  font-variation-settings: 'opsz' 144;
  font-style: italic;
}

.price-qty small {
  font-size: 1rem;
  font-style: normal;
  font-family: var(--font-body);
  color: var(--ink-muted);
  margin-left: 0.5rem;
  letter-spacing: -0.01em;
}

.price-note {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 0.75rem;
}

/* =========  DISCLAIMER  ========= */
.disclaimer {
  background: var(--paper-alt);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.75rem;
  margin: 2.5rem 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.disclaimer .tag {
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-family: var(--font-mono);
}

/* =========  CTA BANNER  ========= */
.banner {
  background: var(--ink);
  color: var(--paper);
  padding: 4rem 3rem;
  border-radius: 4px;
  margin: 5rem auto 2rem;
  max-width: var(--max);
  position: relative;
  overflow: hidden;
}

.banner h2 {
  color: var(--paper);
  max-width: 22ch;
  margin-bottom: 1.25rem;
}

.banner p {
  max-width: 45ch;
  color: var(--paper);
  opacity: 0.8;
  font-size: 1.05rem;
  margin: 0;
}

.banner::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 55%);
  opacity: 0.35;
  pointer-events: none;
}

.banner .banner-mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--paper);
  opacity: 0.55;
  margin-top: 2rem;
  display: block;
}

/* =========  LEGAL PAGES  ========= */
.legal-header {
  padding: 4.5rem 0 2.5rem;
  border-bottom: 1px solid var(--line-soft);
}

.legal-header .container {
  max-width: var(--max);
}

.legal-header h1 {
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  max-width: 20ch;
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.legal-header p.legal-intro {
  max-width: 55ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.55;
}

.legal-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
  margin-top: 2rem;
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.legal-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
  padding: 3.5rem 2rem 5rem;
  max-width: var(--max);
  margin: 0 auto;
}

.legal-toc {
  position: sticky;
  top: 100px;
  align-self: start;
  font-size: 0.875rem;
}

.legal-toc h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 1.25rem;
  font-weight: 500;
}

.legal-toc ol {
  list-style: none;
  counter-reset: toc;
}

.legal-toc li {
  counter-increment: toc;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}

.legal-toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-muted);
  flex-shrink: 0;
}

.legal-toc a {
  color: var(--ink-soft);
  border: none;
  font-size: 0.85rem;
  line-height: 1.3;
}

.legal-toc a:hover {
  color: var(--accent);
}

.legal-content {
  counter-reset: section;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 42rem;
}

.legal-content h2 {
  font-size: 1.8rem;
  margin: 3.5rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--ink);
  font-variation-settings: 'opsz' 32;
  counter-increment: section;
  scroll-margin-top: 100px;
}

.legal-content h2::before {
  content: counter(section, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content h3 {
  font-size: 1.1rem;
  margin: 2rem 0 0.75rem;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.legal-content p {
  margin-bottom: 1rem;
}

.legal-content ul, .legal-content ol {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

.legal-content li {
  margin-bottom: 0.5rem;
}

.legal-content strong {
  color: var(--ink);
  font-weight: 600;
}

.legal-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-alt);
  padding: 0.1em 0.4em;
  border-radius: 2px;
  color: var(--ink);
}

.legal-content .callout {
  background: var(--paper-alt);
  border-left: 3px solid var(--accent);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.legal-content .callout strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

/* =========  FAQ  ========= */
.faq {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  width: 100%;
  background: transparent;
  border: none;
  text-align: left;
  padding: 1.5rem 0;
  font-size: 1.1rem;
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-variation-settings: 'opsz' 18;
  letter-spacing: -0.01em;
  transition: color 0.2s;
}

.faq-q:hover {
  color: var(--accent);
}

.faq-q::after {
  content: '+';
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--accent);
  transition: transform 0.3s;
  font-weight: 300;
  flex-shrink: 0;
}

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

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.open .faq-a {
  max-height: 700px;
  padding-bottom: 1.5rem;
}

/* =========  CONTACT CARD  ========= */
.contact-card {
  background: var(--paper-alt);
  border: 1px solid var(--line);
  padding: 2.5rem 2.25rem;
  margin-top: 3rem;
  max-width: 30rem;
  border-radius: 4px;
}

.contact-card h3 {
  margin-bottom: 0.75rem;
  font-family: var(--font-display);
  font-weight: 500;
}

.contact-card p {
  color: var(--ink-soft);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.contact-card a.email {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  font-weight: 500;
}

.contact-card a.email:hover {
  background: var(--accent);
  color: var(--paper);
  padding: 0.1em 0.3em;
  margin: 0 -0.3em;
}

/* =========  FOOTER  ========= */
footer {
  border-top: 1px solid var(--line);
  padding: 3.5rem 0 2rem;
  margin-top: 5rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: start;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  font-variation-settings: 'opsz' 18;
}

.footer-brand .tagline {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 0.5rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
  max-width: 40ch;
}

.footer-links {
  display: flex;
  gap: 2.5rem;
  font-size: 0.88rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links a {
  border: none;
  color: var(--ink-soft);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-base {
  max-width: var(--max);
  margin: 3rem auto 0;
  padding: 2rem 2rem 0;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* =========  RESPONSIVE  ========= */
@media (max-width: 860px) {
  .legal-body {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 2.5rem 1.5rem 4rem;
  }

  .legal-toc {
    position: static;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
  }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    padding: 1.5rem 2rem 2rem;
    border-bottom: 1px solid var(--line);
    gap: 1.25rem;
    align-items: flex-start;
  }

  .nav-links.mobile-open .lang-toggle {
    margin-top: 0.5rem;
  }

  .hero {
    padding: 3rem 0 2rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .banner {
    padding: 2.5rem 1.75rem;
    margin: 3rem auto;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-links {
    gap: 1.25rem 2rem;
  }

  .container, .content {
    padding: 0 1.5rem;
  }

  .legal-content h2 {
    font-size: 1.5rem;
  }
}

/* =========  PRINT  ========= */
@media print {
  .nav, footer, .lang-toggle { display: none; }
  body { background: white; color: black; }
  body:not(.lang-en) .lang-en,
  body.lang-en .lang-es { display: none !important; }
}

/* =========  UTIL  ========= */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}