/* ============================================================ */
/* Design tokens — CSS variables for easy theming */
/* ============================================================ */

:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8f9;
  --color-text: #1a1a1a;
  --color-text-soft: #555555;
  --color-text-muted: #8a8a8a;
  --color-border: #e4e6e8;

  /* Accent — teal suave */
  --color-accent: #4A9B8E;
  --color-accent-dark: #3a7d72;
  --color-accent-soft: #edf5f3;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.65;
  --line-height-tight: 1.35;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;

  /* Layout */
  --container-max: 780px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition: 200ms ease;
}

/* ============================================================ */
/* Reset + base */
/* ============================================================ */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Respect user preferences */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}

/* Accessible focus states */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ============================================================ */
/* Layout — container */
/* ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================================ */
/* HERO */
/* ============================================================ */

.hero {
  padding: var(--space-lg) 0 var(--space-xl);
  background: linear-gradient(
    180deg,
    var(--color-accent-soft) 0%,
    var(--color-bg) 100%
  );
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.lang-switch {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-soft);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color var(--transition), color var(--transition);
}

.lang-switch:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}

.lang-switch-group {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.brand-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.brand-name {
  color: var(--color-text);
}

.hero-title {
  font-size: 2rem;
  line-height: var(--line-height-tight);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-soft);
  margin: 0 0 var(--space-lg);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-width: 380px;
}

/* ============================================================ */
/* Buttons */
/* ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition),
              border-color var(--transition),
              color var(--transition),
              transform var(--transition);
  text-align: center;
  min-height: 48px;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent-soft);
}

.btn-large {
  padding: 1.05rem 2rem;
  font-size: 1rem;
  min-height: 56px;
}

/* ============================================================ */
/* Sections */
/* ============================================================ */

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

.section-alt {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.section-intro {
  font-size: 1.05rem;
  color: var(--color-text-soft);
  margin: 0 0 var(--space-lg);
}

/* ============================================================ */
/* Features grid */
/* ============================================================ */

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

.feature {
  padding: var(--space-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: var(--space-xs);
  line-height: 1;
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  color: var(--color-text);
}

.feature-body {
  font-size: 0.95rem;
  color: var(--color-text-soft);
  margin: 0;
}

/* ============================================================ */
/* Check list (para quién) */
/* ============================================================ */

.check-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.check-list li {
  position: relative;
  padding-left: 1.75rem;
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.5;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ============================================================ */
/* Email capture form */
/* ============================================================ */

.email-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-width: 380px;
}

.email-form .hp-field {
  position: absolute;
  left: -9999px;
}

.email-form input[type="email"] {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  min-height: 48px;
  transition: border-color var(--transition);
}

.email-form input[type="email"]:focus {
  border-color: var(--color-accent);
  outline: none;
}

.email-form-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.checkbox-row input[type="checkbox"] {
  margin-top: 0.2rem;
  flex-shrink: 0;
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-accent);
}

/* ============================================================ */
/* Placeholder box (contact links pending real URLs/QR) */
/* ============================================================ */

.placeholder-box {
  padding: var(--space-md);
  margin-top: var(--space-xs);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.placeholder-box strong {
  display: block;
  color: var(--color-text-soft);
  margin-bottom: 0.15rem;
}

/* ============================================================ */
/* Disclaimer box */
/* ============================================================ */

.disclaimer-box {
  padding: var(--space-md);
  background-color: var(--color-accent-soft);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
}

.disclaimer-box p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}

.disclaimer-box ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--color-text-soft);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.disclaimer-box strong {
  color: var(--color-accent-dark);
}

/* ============================================================ */
/* Author block */
/* ============================================================ */

.author-block p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}

.author-block p:last-child {
  margin-bottom: 0;
}

.author-block strong {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.author-block a {
  color: var(--color-accent-dark);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
}

.author-block a:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

/* ============================================================ */
/* Blog / changelog */
/* ============================================================ */

.blog-post {
  padding-bottom: var(--space-lg);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.blog-post:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.blog-date {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  background-color: var(--color-accent-soft);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: var(--space-sm);
}

.blog-post-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.blog-entry-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: var(--space-md) 0 var(--space-xs);
  color: var(--color-accent-dark);
}

.blog-entry-body {
  font-size: 1rem;
  color: var(--color-text-soft);
  margin: 0 0 var(--space-sm);
}

.blog-entry-body:last-child {
  margin-bottom: 0;
}

/* ============================================================ */
/* Final CTA */
/* ============================================================ */

.cta-final {
  padding: var(--space-xl) 0;
  background: linear-gradient(
    180deg,
    var(--color-bg) 0%,
    var(--color-accent-soft) 100%
  );
  text-align: center;
}

.cta-final h2 {
  font-size: 1.5rem;
  margin: 0 0 var(--space-xs);
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.cta-final p {
  color: var(--color-text-soft);
  margin: 0 0 var(--space-md);
  font-size: 1rem;
}

/* ============================================================ */
/* Footer */
/* ============================================================ */

.footer {
  padding: var(--space-lg) 0;
  background-color: var(--color-text);
  color: white;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.footer-links a {
  color: white;
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.footer-links a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.footer-separator {
  color: rgba(255, 255, 255, 0.4);
}

.footer-copyright {
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.85rem;
  margin: 0;
}

/* ============================================================ */
/* Responsive — desktop */
/* ============================================================ */

@media (min-width: 640px) {
  .hero {
    padding: var(--space-xl) 0;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-actions {
    flex-direction: row;
    max-width: none;
  }

  .btn {
    flex: 1;
    max-width: 260px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .blog-post-title {
    font-size: 1.6rem;
  }

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

  .cta-final h2 {
    font-size: 1.75rem;
  }
}

@media (min-width: 900px) {
  .hero-title {
    font-size: 2.75rem;
  }
}