/* ==========================================================================
   Nekotech — Landing Page Styles
   Sistema minimalista B2B: navy + slate (identidad del logo) con un único
   acento verde reservado al servicio principal (AI + WhatsApp).
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fa;
  --color-bg-dark: #0f172a;
  --color-bg-dark-alt: #16213a;

  --color-text: #1f2937;
  --color-text-muted: #57657a;
  --color-text-inverse: #f1f5f9;
  --color-text-inverse-muted: #aab6c9;

  --color-border: #e3e8ef;
  --color-border-dark: #2a3752;

  --color-accent: #17a34a;
  --color-accent-dark: #128a3d;
  --color-accent-soft: #e8f6ee;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Courier New", Consolas, monospace;

  --container-width: 1180px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);

  color-scheme: light;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { max-width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }

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

.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 {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--color-bg-dark);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 1rem; }

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.container-narrow { max-width: 760px; }

.term { font-family: var(--font-mono); font-size: 0.94em; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

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

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

.btn-outline-inverse {
  color: var(--color-text-inverse);
  border-color: rgba(241, 245, 249, 0.35);
}
.btn-outline-inverse:hover { background: rgba(241, 245, 249, 0.08); }

.btn-large { padding: 1rem 2rem; font-size: 1.05rem; }
.btn-small { padding: 0.55rem 1.1rem; font-size: 0.9rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.brand-logo {
  height: 42px;
  width: auto;
}

.main-nav ul {
  display: flex;
  gap: 1.75rem;
}
.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.4rem 0.1rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.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; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: 5.5rem 0 4.5rem;
}
.hero-inner { max-width: 760px; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}
.eyebrow-inverse { color: var(--color-text-inverse-muted); }
.eyebrow-accent { color: var(--color-accent); }

.hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.15rem);
  line-height: 1.15;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.hero-subhead {
  font-size: 1.15rem;
  color: var(--color-text-inverse-muted);
  max-width: 620px;
  margin-bottom: 0.9rem;
}
.hero-subhead-secondary { margin-bottom: 2rem; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-inverse-muted);
}

/* ---------- Sections ---------- */
.section { padding: 5rem 0; }
.section-alt { background: var(--color-bg-alt); }

.section-header { margin-bottom: 2.75rem; }
.section-header-center { text-align: center; max-width: 640px; margin-inline: auto; margin-bottom: 3rem; }
.section-header-split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-lead {
  margin-top: 0.75rem;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.lead {
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.section > .container > p,
.container-narrow p {
  color: var(--color-text-muted);
  margin-bottom: 1.1rem;
  max-width: 68ch;
}
.container-narrow .lead { color: var(--color-text); max-width: 68ch; }

.badge-featured {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  border: 1px solid rgba(23, 163, 74, 0.25);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  white-space: nowrap;
}

/* ---------- Featured (AI + WhatsApp) ---------- */
.section-featured {
  background: linear-gradient(180deg, #ffffff 0%, var(--color-accent-soft) 130%);
  border-bottom: 1px solid var(--color-border);
}

.featured-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 3.5rem;
}

.featured-copy p { color: var(--color-text-muted); max-width: 54ch; }
.featured-copy .lead { color: var(--color-text); }

.featured-visual {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-md);
}

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}
.flow-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 72px;
  min-width: 0;
  flex-shrink: 1;
}
.flow-node span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
}
.flow-icon {
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.flow-node-ai .flow-icon {
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  border-color: rgba(23, 163, 74, 0.3);
}
.flow-line {
  flex: 1;
  height: 2px;
  min-width: 20px;
  background: repeating-linear-gradient(90deg, var(--color-border) 0 6px, transparent 6px 11px);
}
.flow-caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- Cards (casos de uso) ---------- */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  border-color: rgba(23, 163, 74, 0.35);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}
.card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  margin-bottom: 1rem;
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; font-weight: 600; }
.card p { color: var(--color-text-muted); font-size: 0.95rem; margin: 0; }

/* ---------- Steps (cómo funciona) ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.step {
  border-top: 3px solid var(--color-accent);
  padding-top: 1.25rem;
}
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: 0.75rem;
  font-size: 1.4rem;
}
.step h3 { font-size: 1.05rem; margin-bottom: 0.5rem; font-weight: 600; }
.step p { color: var(--color-text-muted); font-size: 0.95rem; }

/* ---------- Problemas ---------- */
.problems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.problem {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
}
.problem h3 {
  font-size: 1.02rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.problem p { color: var(--color-text-muted); font-size: 0.95rem; margin: 0; }
.problem-wide { grid-column: 1 / -1; }

/* ---------- Secondary services (Web / Mobile) ---------- */
.secondary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}
.secondary-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  background: var(--color-bg-alt);
}
.secondary-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.75rem; }
.secondary-card > p { color: var(--color-text-muted); margin-bottom: 1.25rem; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.tag-list li {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--color-text);
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
}

.secondary-tech {
  font-size: 0.9rem;
  color: var(--color-text-muted) !important;
  margin: 0 !important;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}
.secondary-tech strong { color: var(--color-text); }

/* ---------- Why (por qué trabajar con Nekotech) ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.why-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
}
.why-item h3 { font-size: 1.02rem; font-weight: 600; margin-bottom: 0.5rem; }
.why-item p { color: var(--color-text-muted); font-size: 0.95rem; margin: 0; }

/* ---------- Technologies ---------- */
.section-tech { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.section-tech .eyebrow { color: var(--color-text-inverse-muted); }
.section-tech .section-lead { color: var(--color-text-inverse-muted); }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.tech-group {
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  background: var(--color-bg-dark-alt);
}
.tech-group h3 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-inverse-muted);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}
.tech-list { display: flex; flex-direction: column; gap: 0.6rem; }
.tech-list li {
  font-size: 1rem;
  font-weight: 600;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--color-border-dark);
}
.tech-list li:last-child { border-bottom: none; padding-bottom: 0; }

/* ---------- CTA final ---------- */
.cta-final { background: var(--color-accent-soft); text-align: center; }
.cta-final-inner h2 { margin-bottom: 1rem; }
.cta-final-inner p { margin-inline: auto; margin-bottom: 2rem; color: var(--color-text-muted); }
.cta-final-inner .btn { margin-bottom: 2rem; }

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.75rem;
}
.contact-links a {
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}
.contact-links a:hover,
.contact-links a:focus-visible { border-bottom-color: var(--color-accent); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.footer-logo { height: 34px; }
.footer-nav ul { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.footer-nav a, .footer-contact a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.footer-nav a:hover, .footer-contact a:hover { color: var(--color-text); }
.footer-contact { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.footer-note {
  width: 100%;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 960px) {
  .featured-grid { grid-template-columns: 1fr; }
  .featured-visual { order: -1; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .usecases-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: 1fr; }
}

@media (max-width: 780px) {
  .header-cta { display: none; }
  .nav-toggle { display: flex; }

  .main-nav {
    position: fixed;
    inset: 64px 0 auto 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
  }
  .main-nav a {
    display: block;
    padding: 0.9rem 1.5rem;
    border-bottom: none;
  }
  .main-nav a:hover, .main-nav a:focus-visible {
    background: var(--color-bg-alt);
    border-bottom: none;
  }

  .usecases-grid { grid-template-columns: 1fr; }
  .problems-grid { grid-template-columns: 1fr; }
  .problem-wide { grid-column: auto; }
  .secondary-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 2rem; }

  .section { padding: 3.5rem 0; }
  .hero { padding: 3.5rem 0 3rem; }

  .footer-inner { flex-direction: column; align-items: flex-start; text-align: left; }
  .footer-note { text-align: left; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { text-align: center; }

  .featured-visual { padding: 1.5rem 1rem; }
  .flow-node { width: 64px; }
  .flow-icon { width: 36px; height: 36px; padding: 8px; }
  .flow-node span { font-size: 0.72rem; }
}