/* ========================================
   Noxbi Landing Page — Styles
   Mobile-first CSS with custom properties
   ======================================== */

/* === Custom Properties === */
:root {
  --color-primary: #0D2240;
  --color-accent: #2B9FE8;
  --color-white: #FFFFFF;
  --color-bg-light: #F5F7FA;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-error: #D32F2F;
  --color-success: #2E7D32;
  --color-whatsapp: #25D366;

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                 Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  --max-width: 1200px;
  --nav-height: 60px;

  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-family);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3 {
  font-weight: 700;
  line-height: 1.2;
}

/* === Screen Reader Only === */
.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;
}

/* === Skip Link === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

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

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
}

.section--alt {
  background-color: var(--color-bg-light);
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.section__title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-lg);
  text-align: center;
  color: var(--color-primary);
}

.section--alt .section__title {
  color: var(--color-primary);
}

.section--dark .section__title {
  color: var(--color-white);
}

.section__lead {
  font-size: 1.125rem;
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-text-light);
}

.section--dark .section__lead {
  color: rgba(255, 255, 255, 0.85);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

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

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn--primary:hover {
  background-color: #2490d4;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(43, 159, 232, 0.3);
}

.btn--whatsapp {
  background-color: var(--color-whatsapp);
  color: var(--color-white);
}

.btn--whatsapp:hover {
  background-color: #20b858;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3);
}

/* === Navigation === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  height: var(--nav-height);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  height: var(--nav-height);
}

.nav__logo img {
  height: 28px;
  width: auto;
}

.nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 110;
}

.nav__toggle:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.nav__toggle-icon,
.nav__toggle-icon::before,
.nav__toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition-normal),
              opacity var(--transition-fast);
  position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.nav__toggle-icon::before {
  top: -7px;
}

.nav__toggle-icon::after {
  top: 7px;
}

/* Hamburger → X transition */
.nav__toggle[aria-expanded="true"] .nav__toggle-icon {
  background-color: transparent;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Mobile nav menu */
.nav__menu {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background-color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: var(--spacing-md) 0;
  flex-direction: column;
}

.nav__menu--open {
  display: flex;
}

.nav__link {
  display: flex;
  align-items: center;
  padding: 0.75rem var(--spacing-md);
  color: var(--color-primary);
  font-weight: 400;
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
  min-height: 44px;
}

.nav__link:hover {
  background-color: var(--color-bg-light);
}

.nav__link:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: -3px;
}

.nav__link--cta {
  font-weight: 700;
  color: var(--color-primary);
}

/* No-JS fallback: show menu without JS */
.no-js .nav__toggle {
  display: none;
}

.no-js .nav__menu {
  display: flex;
  position: static;
  box-shadow: none;
  padding: 0;
  flex-direction: row;
  gap: var(--spacing-sm);
}

/* === Hero === */
.hero {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: calc(var(--spacing-xl) * 2) 0;
  display: flex;
  align-items: center;
}

.hero .container {
  text-align: center;
}

.hero__title {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.15;
}

.hero__subtitle {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

/* === Pain Points (Problema) === */
.pain-points {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.pain-point {
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: 0.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.pain-point__title {
  font-size: 1.125rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.pain-point__desc {
  color: var(--color-text-light);
}

/* === Solution / Unification Visual === */
.unification-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) 0;
  max-width: 800px;
  margin: 0 auto;
}

.unification-sources {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.unification-source {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-radius: 0.5rem;
  min-width: 80px;
}

.unification-source svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.unification-source span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

.unification-arrow {
  color: var(--color-accent);
  font-size: 2rem;
  transform: rotate(90deg);
  line-height: 1;
}

.unification-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 0.5rem;
  border: 2px solid var(--color-accent);
}

.unification-result svg {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
}

.unification-result span {
  font-size: 0.875rem;
  font-weight: 700;
}

/* === Steps (Cómo Funciona) === */
.steps {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.step {
  text-align: center;
  padding: var(--spacing-lg);
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.step__title {
  font-size: 1.125rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.step__desc {
  color: var(--color-text-light);
}

/* === Qualification (¿Es Noxbi para vos?) === */
.qualification {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto var(--spacing-lg);
}

.qualification__card {
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: 0.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.qualification__title {
  font-size: 1.125rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.qualification__desc {
  color: var(--color-text-light);
}

.qualification__cta-wrapper {
  text-align: center;
}

/* === Features (Diferenciadores) === */
.features {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
}

.feature {
  padding: var(--spacing-lg);
  background-color: var(--color-bg-light);
  border-radius: 0.5rem;
  border-left: 4px solid var(--color-accent);
}

.feature__title {
  font-size: 1.063rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.feature__desc {
  color: var(--color-text-light);
}

/* === Testimonials (Prueba Social) === */
.testimonials {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.testimonial {
  padding: var(--spacing-lg);
  border-left: 4px solid var(--color-accent);
  background-color: var(--color-white);
  border-radius: 0 0.5rem 0.5rem 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.testimonial__text {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.testimonial__cite {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-text-light);
}

/* === Contact Section === */
.contact-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) auto;
  max-width: 400px;
  color: rgba(255, 255, 255, 0.7);
}

.contact-divider::before,
.contact-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.3);
}

/* === Contact Form === */
.contact-form {
  max-width: 500px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 700;
  font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid #ccc;
  border-radius: 0.375rem;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(43, 159, 232, 0.2);
}

.form-group input.input--error,
.form-group textarea.input--error {
  border-color: var(--color-error);
}

.form-error {
  display: block;
  min-height: 1.25rem;
  font-size: 0.8125rem;
  color: var(--color-error);
  margin-top: var(--spacing-xs);
}

.section--dark .form-error {
  color: #ff8a80;
}

.form-status {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: 0.375rem;
  text-align: center;
  display: none;
}

.form-status--success {
  display: block;
  background-color: rgba(46, 125, 50, 0.15);
  color: #a5d6a7;
  border: 1px solid #a5d6a7;
}

.form-status--error {
  display: block;
  background-color: rgba(211, 47, 47, 0.15);
  color: #ff8a80;
  border: 1px solid #ff8a80;
}

.form-status--sending {
  display: block;
  color: rgba(255, 255, 255, 0.7);
}

.contact-form .btn {
  width: 100%;
  margin-top: var(--spacing-sm);
}

/* === WhatsApp Float === */
.whatsapp-float {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  width: 56px;
  height: 56px;
  background-color: var(--color-whatsapp);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
  z-index: 90;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(37, 211, 102, 0.5);
}

.whatsapp-float:focus-visible {
  outline: 3px solid var(--color-white);
  outline-offset: 2px;
}

/* === Footer === */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer__brand {
  text-align: center;
}

.footer__brand img {
  height: 24px;
  width: auto;
  margin: 0 auto var(--spacing-sm);
}

.footer__tagline {
  font-size: 0.875rem;
  opacity: 0.8;
}

.footer__links ul {
  display: flex;
  gap: var(--spacing-md);
}

.footer__links a {
  font-size: 0.875rem;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer__links a:hover {
  opacity: 1;
}

.footer__links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.footer__copyright {
  text-align: center;
  font-size: 0.75rem;
  opacity: 0.6;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
}

/* ========================================
   Media Queries — Responsive Breakpoints
   ======================================== */

/* Tablet (≥ 768px) */
@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    display: flex;
    position: static;
    box-shadow: none;
    padding: 0;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-xs);
  }

  .nav__link {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }

  .nav__link:hover {
    background-color: transparent;
    color: var(--color-accent);
  }

  .nav__link--cta {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-radius: 0.375rem;
    padding: 0.5rem 1rem;
  }

  .nav__link--cta:hover {
    background-color: #2490d4;
    color: var(--color-white);
  }

  .hero__title {
    font-size: 2.75rem;
  }

  .hero__subtitle {
    font-size: 1.25rem;
  }

  .section__title {
    font-size: 2rem;
  }

  .pain-points {
    grid-template-columns: repeat(3, 1fr);
  }

  .unification-visual {
    flex-direction: row;
  }

  .unification-arrow {
    transform: rotate(0deg);
  }

  .steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .qualification {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .footer__content {
    flex-direction: row;
    justify-content: space-between;
  }

  .footer__brand {
    text-align: left;
  }

  .footer__brand img {
    margin: 0 0 var(--spacing-sm);
  }
}

/* Desktop (≥ 1024px) */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }

  .hero__title {
    font-size: 3.25rem;
  }

  .section {
    padding: 5rem 0;
  }

  .section__title {
    font-size: 2.25rem;
  }

  .features {
    grid-template-columns: repeat(3, 1fr);
  }
}