/* ==========================================================================
   SISTEMA DE DISEÑO — CalculaES
   Tokens, reset, tipografía, layout, componentes base
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS (CSS Custom Properties)
   -------------------------------------------------------------------------- */
:root {
  /* Colores de marca */
  --color-primary: #1a3c6e; /* Azul marino — confianza financiera */
  --color-primary-hover: #142f57;
  --color-primary-light: #2563eb;
  --color-primary-muted: #dbeafe;

  --color-secondary: #059669; /* Verde — crecimiento, positivo */
  --color-secondary-hover: #047857;
  --color-secondary-muted: #d1fae5;

  --color-accent: #d97706; /* Ámbar — CTAs secundarios */
  --color-accent-hover: #b45309;

  --color-danger: #dc2626;
  --color-danger-muted: #fee2e2;
  --color-warning: #f59e0b;
  --color-warning-muted: #fef3c7;
  --color-success: #10b981;
  --color-success-muted: #d1fae5;

  /* Neutrales */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-white: #ffffff;

  /* Superficies */
  --surface-page: var(--color-neutral-50);
  --surface-card: var(--color-white);
  --surface-input: var(--color-white);
  --surface-header: var(--color-primary);

  /* Texto */
  --text-primary: var(--color-neutral-900);
  --text-secondary: var(--color-neutral-600);
  --text-muted: var(--color-neutral-400);
  --text-inverse: var(--color-white);
  --text-link: var(--color-primary-light);

  /* Bordes */
  --border-color: var(--color-neutral-200);
  --border-focus: var(--color-primary-light);
  --border-radius-sm: 0.25rem;
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-full: 9999px;

  /* Tipografía */
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Espaciado (escala × 0.25rem) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg:
    0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl:
    0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  /* Transiciones */
  --transition-fast: 100ms ease;
  --transition: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --container-max: 1200px;
  --container-pad: var(--space-4);

  /* AdSense — reservar espacio para evitar CLS */
  --ad-height-leaderboard: 90px;
  --ad-height-rectangle: 250px;
  --ad-height-responsive: 100px;
}

/* --------------------------------------------------------------------------
   2. RESET
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--surface-page);
  min-height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

a {
  color: var(--text-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover {
  color: var(--color-primary);
}

ol,
ul {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

p {
  max-width: 72ch;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* --------------------------------------------------------------------------
   3. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-2 {
  gap: var(--space-2);
}
.gap-4 {
  gap: var(--space-4);
}
.gap-6 {
  gap: var(--space-6);
}

/* --------------------------------------------------------------------------
   4. HEADER Y NAV
   -------------------------------------------------------------------------- */
.site-header {
  background-color: var(--surface-header);
  color: var(--text-inverse);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.site-logo {
  font-size: var(--text-xl);
  font-weight: var(--font-extrabold);
  color: var(--text-inverse);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.site-logo span {
  color: #60a5fa;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.site-nav a {
  color: rgb(255 255 255 / 0.85);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  background-color: var(--color-secondary);
  color: var(--text-inverse) !important;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  transition: background-color var(--transition-fast) !important;
}

.nav-cta:hover {
  background-color: var(--color-secondary-hover) !important;
}

/* --------------------------------------------------------------------------
   5. BOTONES
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  line-height: 1;
}

.btn:focus-visible {
  outline: 3px solid var(--border-focus);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--text-inverse);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--text-inverse);
}
.btn-secondary:hover {
  background-color: var(--color-secondary-hover);
  color: var(--text-inverse);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover {
  background-color: var(--color-neutral-100);
  color: var(--text-primary);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   6. TARJETAS
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--transition),
    transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

/* --------------------------------------------------------------------------
   7. FORMULARIOS BASE
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--text-base);
  background-color: var(--surface-input);
  color: var(--text-primary);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

.form-input[aria-invalid="true"] {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgb(220 38 38 / 0.1);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  font-weight: var(--font-medium);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   8. BADGES Y ETIQUETAS
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.7em;
  border-radius: var(--border-radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: var(--color-primary-muted);
  color: var(--color-primary);
}
.badge-green {
  background: var(--color-secondary-muted);
  color: var(--color-secondary-hover);
}
.badge-amber {
  background: var(--color-warning-muted);
  color: var(--color-accent-hover);
}

/* --------------------------------------------------------------------------
   9. SLOTS ADSENSE (reserva de espacio para evitar CLS)
   -------------------------------------------------------------------------- */
.ad-slot {
  width: 100%;
  background-color: var(--color-neutral-100);
  border: 1px dashed var(--border-color);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--text-xs);
  overflow: hidden;
}

.ad-slot--leaderboard {
  min-height: var(--ad-height-leaderboard);
  margin-block: var(--space-6);
}

.ad-slot--rectangle {
  min-height: var(--ad-height-rectangle);
  margin-block: var(--space-8);
}

.ad-slot--responsive {
  min-height: var(--ad-height-responsive);
  margin-block: var(--space-6);
}

/* --------------------------------------------------------------------------
   10. BREADCRUMB
   -------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
  padding-block: var(--space-3);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--text-primary);
}
.breadcrumb-sep {
  color: var(--color-neutral-300);
}

/* --------------------------------------------------------------------------
   11. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-neutral-900);
  color: var(--color-neutral-400);
  padding-block: var(--space-12);
  margin-top: var(--space-20);
}

.site-footer a {
  color: var(--color-neutral-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.site-footer a:hover {
  color: var(--text-inverse);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-3);
  max-width: 28ch;
}

.footer-col h3 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-inverse);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-4);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col li a {
  font-size: var(--text-sm);
}

.footer-bottom {
  border-top: 1px solid var(--color-neutral-800);
  padding-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* --------------------------------------------------------------------------
   12. UTILIDADES GENERALES
   -------------------------------------------------------------------------- */
.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;
}

.text-center {
  text-align: center;
}
.text-right {
  text-align: right;
}
.text-sm {
  font-size: var(--text-sm);
}
.text-xs {
  font-size: var(--text-xs);
}
.text-lg {
  font-size: var(--text-lg);
}
.text-muted {
  color: var(--text-muted);
}
.text-secondary {
  color: var(--text-secondary);
}
.text-primary-color {
  color: var(--color-primary);
}
.text-success {
  color: var(--color-secondary);
}
.font-bold {
  font-weight: var(--font-bold);
}
.font-medium {
  font-weight: var(--font-medium);
}

.mt-4 {
  margin-top: var(--space-4);
}
.mt-6 {
  margin-top: var(--space-6);
}
.mt-8 {
  margin-top: var(--space-8);
}
.mb-4 {
  margin-bottom: var(--space-4);
}
.mb-6 {
  margin-bottom: var(--space-6);
}
.mb-8 {
  margin-bottom: var(--space-8);
}

.max-w-prose {
  max-width: 65ch;
}
.mx-auto {
  margin-inline: auto;
}

/* --------------------------------------------------------------------------
   13. HAMBURGER / MENÚ MÓVIL
   -------------------------------------------------------------------------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background: rgb(255 255 255 / 0.1);
}
.nav-toggle:focus-visible {
  outline: 2px solid #60a5fa;
  outline-offset: 2px;
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition:
    transform var(--transition),
    opacity var(--transition);
  transform-origin: center;
}

/* Animación a X cuando el menú está abierto */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   14. FRANJA DE ESTADÍSTICAS
   -------------------------------------------------------------------------- */
.stats-bar {
  background: var(--color-white);
  border-bottom: 1px solid var(--border-color);
  padding-block: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.stats-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.stats-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-inline: var(--space-8);
  position: relative;
}

.stats-item + .stats-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10%;
  height: 80%;
  width: 1px;
  background: var(--border-color);
}

.stats-number {
  font-size: var(--text-2xl);
  font-weight: var(--font-extrabold);
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.5px;
}

.stats-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: var(--font-medium);
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   15. ANIMACIÓN DE TARJETAS (IntersectionObserver — progressive enhancement)
   -------------------------------------------------------------------------- */
.card.animate-ready {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.45s ease,
    transform 0.45s ease;
}

.card.animate-ready.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Retardo escalonado para las tarjetas del grid */
.grid .card.animate-ready:nth-child(2) {
  transition-delay: 60ms;
}
.grid .card.animate-ready:nth-child(3) {
  transition-delay: 120ms;
}
.grid .card.animate-ready:nth-child(4) {
  transition-delay: 180ms;
}
.grid .card.animate-ready:nth-child(5) {
  transition-delay: 240ms;
}
.grid .card.animate-ready:nth-child(6) {
  transition-delay: 300ms;
}
.grid .card.animate-ready:nth-child(7) {
  transition-delay: 360ms;
}
.grid .card.animate-ready:nth-child(8) {
  transition-delay: 420ms;
}

/* --------------------------------------------------------------------------
   16. RESPONSIVE
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --text-4xl: 1.875rem;
    --text-5xl: 2.25rem;
    --container-pad: var(--space-4);
  }

  /* Hamburger visible, nav oculto por defecto */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-primary-hover);
    padding: var(--space-4);
    gap: var(--space-1);
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius);
    font-size: var(--text-base);
  }

  .site-nav a:hover {
    background: rgb(255 255 255 / 0.08);
  }

  .nav-cta {
    margin-top: var(--space-2);
    text-align: center;
  }

  /* Stats bar en móvil: 2 columnas */
  .stats-item {
    padding-inline: var(--space-4);
  }
  .stats-number {
    font-size: var(--text-xl);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .stats-list {
    gap: var(--space-2);
  }
  .stats-item + .stats-item::before {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}