/* Presión Arterial — landing page
   Reutiliza la identidad visual real de la PWA (tema oscuro):
   fondo azul marino "instrument screen", coral = sistólica, teal = diastólica / acción primaria. */

:root {
  /* Backgrounds */
  --bg-primary: #0D1728;
  --bg-secondary: #0A1220;
  --bg-card: #121E33;
  --bg-elevated: #1A2740;

  /* Text */
  --text-primary: #EDF2F9;
  --text-secondary: #92A2BE;

  /* Brand accents */
  --accent-coral: #FF6A52;
  --accent-teal: #2DD4B8;
  --accent-teal-hover: #52E0C8;

  /* Border */
  --border-color: #223151;

  /* Glows — el detalle de "pantalla de instrumento médico" del monitor del hero */
  --glow-coral: 0 0 26px rgba(255, 106, 82, 0.32);
  --glow-teal: 0 0 26px rgba(45, 212, 184, 0.32);

  /* Typography */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  --font-base: 18px;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 999px;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;

  /* Shadows */
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.35);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.45);
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--font-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 var(--spacing-sm);
  color: var(--text-primary);
}

p {
  margin: 0 0 var(--spacing-sm);
  color: var(--text-secondary);
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* Accessibility: visible keyboard focus everywhere */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent-teal);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--accent-teal);
  color: #06251F;
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 700;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

.section-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xxl) var(--spacing-lg);
}

.eyebrow {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-teal);
  margin-bottom: var(--spacing-xs);
}

/* Buttons */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.9rem 1.75rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.btn-primary {
  background-color: var(--accent-teal);
  color: #06251F;
}

.btn-primary:hover {
  background-color: var(--accent-teal-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary--compact {
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.btn-primary--large {
  padding: 1.1rem 2.25rem;
  font-size: 1.1rem;
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-teal);
  border: 2px solid var(--accent-teal);
}

.btn-secondary:hover {
  background-color: rgba(45, 212, 184, 0.12);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .btn-primary:hover,
  .btn-secondary:hover {
    transform: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 18, 32, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-primary);
  white-space: nowrap;
}

.site-nav {
  display: none;
  gap: var(--spacing-lg);
  flex: 1;
  justify-content: center;
}

.site-nav a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: var(--text-primary);
}

/* Hero */
.hero {
  background-color: var(--bg-primary);
  padding: var(--spacing-xl) 0 var(--spacing-xxl);
}

.hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero__copy {
  text-align: center;
  max-width: 40rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  margin-bottom: var(--spacing-md);
}

.hero__tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.hero__monitor {
  width: 100%;
  max-width: 24rem;
  display: flex;
  justify-content: center;
}

/* Signature element: réplica del panel LCD de un monitor de presión real */
.monitor-panel {
  width: 100%;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.monitor-panel__labels {
  display: flex;
  gap: 2.1em;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  align-self: flex-start;
}

.bp-readout {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(2.75rem, 10vw, 4rem);
}

.bp-readout .systolic {
  color: var(--accent-coral);
  text-shadow: var(--glow-coral);
}

.bp-readout .sep {
  color: var(--text-secondary);
  font-weight: 400;
  opacity: 0.7;
}

.bp-readout .diastolic {
  color: var(--accent-teal);
  text-shadow: var(--glow-teal);
}

.bp-readout .unit {
  font-family: var(--font-body);
  font-size: 0.28em;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-left: 0.35em;
  align-self: center;
}

.monitor-panel__pulse {
  width: 100%;
  height: 2rem;
}

.monitor-panel__pulse svg {
  width: 100%;
  height: 100%;
}

.monitor-panel__pulse polyline {
  fill: none;
  stroke: var(--accent-teal);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.75;
}

/* Features */
.features {
  background-color: var(--bg-secondary);
}

.features h2,
.how-it-works h2,
.professionals h2 {
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  max-width: 32rem;
}

.feature-grid {
  margin-top: var(--spacing-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border-top: 3px solid var(--accent-teal);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--spacing-xs);
}

.feature-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Cómo funciona */
.how-it-works {
  background-color: var(--bg-primary);
}

.steps {
  margin-top: var(--spacing-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.step {
  position: relative;
  padding-left: 4rem;
}

.step__number {
  position: absolute;
  left: 0;
  top: -0.2rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 2.5rem;
  color: var(--accent-teal);
  line-height: 1;
}

.step h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.step p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Profesionales */
.professionals {
  background-color: var(--bg-secondary);
}

.professionals__inner {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.professionals__copy p {
  margin-bottom: 0;
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.site-footer__inner {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.wordmark--footer {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.site-footer__tagline {
  max-width: 26rem;
  margin-bottom: 0;
  font-size: 0.9rem;
}

/* ---------- Tablet ---------- */
@media (min-width: 768px) {
  html {
    scroll-behavior: smooth;
  }

  .site-nav {
    display: flex;
  }

  .hero__inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
  }

  .hero__copy {
    text-align: left;
    flex: 1;
  }

  .hero__monitor {
    flex: 1;
    max-width: 22rem;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .professionals__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .professionals__copy {
    max-width: 34rem;
  }

  .site-footer__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ---------- Desktop ---------- */
@media (min-width: 1200px) {
  .feature-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .hero__copy {
    max-width: 34rem;
  }
}