/* =========================================================
   BIOSEP — hoja de estilos única del sitio
   Colores y tipografías oficiales: Manual de Identidad Gráfica 2019
   ========================================================= */

:root {
  /* Azules oficiales de marca */
  --color-b1: #005087; /* Pantone 7462C */
  --color-b2: #0096c1; /* Pantone 7703C */
  --color-b3: #00e4db; /* Pantone 3252C */
  --color-alt1: #0066f9; /* Pantone 285C */
  --color-alt2: #08dcff; /* Pantone 311C */

  --color-bg: #f4f8fb;
  --color-surface: #ffffff;
  --color-text: #0a2540;
  --color-text-muted: #4a6178;
  --color-border: #dbe6ee;
  --color-accent: var(--color-b1);

  --font-body: "Nunito", system-ui, -apple-system, sans-serif;
  --font-display: "League Spartan", var(--font-body);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --content-max-width: 1280px;
  --radius-md: 8px;
  --radius-lg: 16px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a1420;
    --color-surface: #10202f;
    --color-text: #eaf2f8;
    --color-text-muted: #9db3c4;
    --color-border: #1c3346;
    --color-accent: var(--color-alt2);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0a1420;
  --color-surface: #10202f;
  --color-text: #eaf2f8;
  --color-text-muted: #9db3c4;
  --color-border: #1c3346;
  --color-accent: var(--color-alt2);
  color-scheme: dark;
}

/* ---------- reset / base ---------- */
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img,
svg {
  display: block;
  max-width: 100%;
}
h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 var(--space-4);
}
h1 {
  font-size: clamp(2.25rem, 1.7rem + 2.5vw, 3.75rem);
}
h2 {
  font-size: clamp(1.75rem, 1.5rem + 1.2vw, 2.5rem);
}
h3 {
  font-size: clamp(1.15rem, 1.05rem + 0.4vw, 1.4rem);
}
p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-muted);
}
a {
  color: var(--color-accent);
}
.container {
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus {
  left: 0;
}
:focus-visible {
  outline: 3px solid var(--color-alt1);
  outline-offset: 2px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}
.brand {
  line-height: 0;
  display: inline-flex;
}
.brand img {
  height: 2.25rem;
  width: auto;
}
.logo-dark {
  display: none;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-light {
    display: none;
  }
  :root:not([data-theme="light"]) .logo-dark {
    display: block;
  }
}
:root[data-theme="dark"] .logo-light {
  display: none;
}
:root[data-theme="dark"] .logo-dark {
  display: block;
}

.nav-toggle {
  display: none;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  position: relative;
  cursor: pointer;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 25%;
  width: 50%;
  height: 2px;
  background: var(--color-text);
}
.nav-toggle-bars {
  top: 50%;
  transform: translateY(-50%);
}
.nav-toggle-bars::before {
  top: -6px;
}
.nav-toggle-bars::after {
  top: 6px;
}
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.primary-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 700;
  font-family: var(--font-display);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-left: var(--space-4);
  border-left: 1px solid var(--color-border);
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
}
.lang-switch a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
}
.lang-switch a[aria-current="page"] {
  color: var(--color-accent);
  background: var(--color-bg);
}
.lang-switch span {
  color: var(--color-border);
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}
.theme-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
}
.icon-moon {
  display: none;
}
:root[data-theme="dark"] .icon-sun {
  display: none;
}
:root[data-theme="dark"] .icon-moon {
  display: block;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  .primary-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6);
    display: none;
  }
  .primary-nav.is-open {
    display: flex;
  }
  .header-actions {
    border-left: none;
    padding-left: 0;
  }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(4rem, 8vw, 8rem);
  overflow: hidden;
}
.glow-backdrop {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}
.glow-backdrop::before,
.glow-backdrop::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
}
.glow-backdrop::before {
  width: 40vw;
  height: 40vw;
  top: -10%;
  left: -5%;
  background: var(--color-b2);
}
.glow-backdrop::after {
  width: 35vw;
  height: 35vw;
  bottom: -15%;
  right: -5%;
  background: var(--color-b3);
}
.hero-inner {
  max-width: 46rem;
}
.eyebrow {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-b2);
  margin-bottom: var(--space-4);
}
.subtitle {
  font-size: 1.15rem;
  margin-bottom: var(--space-8);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  background: var(--color-b1);
  color: #fff;
}
.btn:hover {
  background: var(--color-alt1);
}

/* ---------- sections ---------- */
.section {
  padding-block: var(--space-24);
  scroll-margin-top: 5rem;
}
.section-alt {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}
.section-intro {
  max-width: 42rem;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
}
.business-grid {
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .business-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.section-alt .card {
  background: var(--color-bg);
}
.card h3 {
  color: var(--color-b1);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .card h3 {
    color: var(--color-alt2);
  }
}
:root[data-theme="dark"] .card h3 {
  color: var(--color-alt2);
}
.card p {
  margin-bottom: 0;
}
.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
  padding: 0;
}
.contact-list dt {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-b1);
  margin-bottom: var(--space-1);
}
.contact-list dd {
  margin: 0;
  color: var(--color-text-muted);
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.footer-mark img {
  height: 1.75rem;
}
.rights {
  margin: 0;
  font-size: 0.9rem;
}
.footer-inner a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ---------- legal pages ---------- */
.legal {
  padding-block: var(--space-16);
  max-width: 48rem;
}
.legal-note {
  font-style: italic;
  font-size: 0.85rem;
}

/* ---------- 404 ---------- */
.not-found {
  text-align: center;
  padding-block: var(--space-24);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}