/* ============================================================
   SmartInventory AI — Landing design system
   Estilo: híbrido premium-claro
   Base clara (confianza, SEO) + secciones oscuras de impacto
   ============================================================ */

:root {
  --ink: #0a1628;          /* azul noche profundo (secciones dark) */
  --ink-soft: #122036;
  --paper: #ffffff;
  --tint: #f4f7f6;         /* gris verdoso muy claro */
  --text: #1c2733;
  --text-soft: #5a6876;
  --text-inverse: #eef3f1;
  --text-inverse-soft: #9fb0ac;
  --accent: #10b981;       /* esmeralda de marca */
  --accent-deep: #0a8f63;
  --accent-glow: rgba(16, 185, 129, 0.35);
  --gold: #c9a24b;         /* toque premium */
  --border: #e3e9e7;
  --border-dark: rgba(255, 255, 255, 0.09);
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 10px 40px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 24px 70px rgba(10, 22, 40, 0.16);
  --font-head: 'Sora', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 820px; }
.center { text-align: center; }
.lead { font-size: 1.15rem; color: var(--text-soft); margin-top: 1rem; }
.micro { font-size: 0.82rem; color: var(--text-soft); margin-top: 0.9rem; }
.prose { margin-top: 1rem; color: var(--text-soft); font-size: 1.04rem; }
.eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent-deep);
  margin-bottom: 0.8rem;
}

/* ---------- Secciones ---------- */
.section { padding: 96px 0; }
.section-tinted { background: var(--tint); }
.section-dark {
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(16, 185, 129, 0.13), transparent 60%),
    radial-gradient(800px 420px at 5% 110%, rgba(201, 162, 75, 0.07), transparent 60%),
    var(--ink);
  color: var(--text-inverse);
}
.section-dark .lead, .section-dark .micro, .section-dark p { color: var(--text-inverse-soft); }
.section-dark h1, .section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .eyebrow { color: var(--accent); }
.section-head { max-width: 720px; margin: 0 auto 56px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.site-header.scrolled { border-bottom-color: var(--border); box-shadow: 0 6px 24px rgba(10,22,40,0.06); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-head); font-weight: 700; font-size: 1.02rem; }
.main-nav { display: flex; gap: 28px; font-size: 0.92rem; font-weight: 500; }
.main-nav a { color: var(--text-soft); transition: color 0.2s; }
.main-nav a:hover { color: var(--accent-deep); }
.header-actions { display: flex; align-items: center; gap: 14px; }

/* selector de idioma */
.lang-switch { position: relative; }
.lang-btn {
  background: none; border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 14px; font-size: 0.8rem; font-weight: 600; cursor: pointer; color: var(--text-soft);
}
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px); list-style: none;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow); padding: 6px; min-width: 150px;
  opacity: 0; visibility: hidden; transform: translateY(-6px); transition: all 0.2s;
}
.lang-switch.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu a { display: block; padding: 8px 12px; border-radius: 8px; font-size: 0.88rem; }
.lang-menu a:hover { background: var(--tint); }
.lang-menu a.active { color: var(--accent-deep); font-weight: 600; }

/* hamburguesa */
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; }

/* ---------- Botones ---------- */
.btn {
  display: inline-block; font-weight: 600; font-family: var(--font-head);
  border-radius: 999px; padding: 12px 26px; font-size: 0.95rem;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s;
  cursor: pointer; border: none; text-align: center;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-deep));
  color: #fff; box-shadow: 0 8px 26px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 12px 34px var(--accent-glow); }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent-deep); }
.btn-ghost { background: rgba(255,255,255,0.08); color: #fff; border: 1px solid var(--border-dark); }
.btn-ghost:hover { background: rgba(255,255,255,0.15); }
.btn-sm { padding: 9px 20px; font-size: 0.85rem; }
.btn-lg { padding: 15px 34px; font-size: 1.02rem; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 1.8rem; }

/* ---------- Hero home ---------- */
.hero { position: relative; overflow: hidden; padding: 110px 0 130px; }
.hero-glow {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(700px 380px at 70% 20%, rgba(16,185,129,0.18), transparent 65%);
  animation: glowDrift 9s ease-in-out infinite alternate;
}
@keyframes glowDrift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(-40px, 30px) scale(1.08); }
}
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; position: relative; }
.badge {
  display: inline-block; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.06em;
  border: 1px solid var(--border-dark); border-radius: 999px; padding: 6px 14px;
  color: var(--accent); background: rgba(16,185,129,0.08); margin-bottom: 1.4rem;
}
.badge-light { border-color: var(--border); background: rgba(16,185,129,0.07); color: var(--accent-deep); }
.hero-stats { display: flex; gap: 40px; margin-top: 2.6rem; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat-num, .stat-suffix { font-family: var(--font-head); font-size: 1.9rem; font-weight: 800; color: #fff; display: inline; }
.stat .stat-num { display: inline; }
.stat-label { font-size: 0.82rem; color: var(--text-inverse-soft); margin-top: 2px; }

.hero-visual { position: relative; }
.hero-img {
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-dark);
}
.hero-phone {
  position: absolute; bottom: -34px; left: -30px; width: 168px;
  border-radius: 24px; box-shadow: var(--shadow-lg);
  animation: floatY 5s ease-in-out infinite;
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Hero cluster ---------- */
.cluster-hero { padding: 90px 0 70px; background: linear-gradient(180deg, var(--tint), var(--paper)); }
.cluster-img { border-radius: var(--radius); box-shadow: var(--shadow); }

/* ---------- Pasos ---------- */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.step-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; position: relative; transition: transform 0.25s, box-shadow 0.25s;
}
.step-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.step-card img { border-radius: var(--radius-sm); margin-bottom: 1.1rem; }
.step-card h3 { margin-bottom: 0.5rem; }
.step-card p { color: var(--text-soft); font-size: 0.95rem; }
.step-num {
  position: absolute; top: -16px; left: 24px; width: 34px; height: 34px;
  background: linear-gradient(120deg, var(--accent), var(--accent-deep)); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head); font-weight: 700; font-size: 0.95rem;
  box-shadow: 0 6px 16px var(--accent-glow);
}

/* ---------- Beneficios ---------- */
.benefits-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.benefit-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform 0.25s, box-shadow 0.25s;
}
.benefit-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.benefit-icon { font-size: 1.7rem; display: block; margin-bottom: 0.8rem; }
.benefit-card h3 { margin-bottom: 0.4rem; }
.benefit-card p { color: var(--text-soft); font-size: 0.94rem; }
.benefit-dark { background: var(--ink-soft); border-color: var(--border-dark); }
.benefit-dark p { color: var(--text-inverse-soft); }

/* ---------- Demo IA ---------- */
.demo-section { overflow: hidden; }
.demo-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; }
.check-list { list-style: none; margin: 1.6rem 0 2rem; }
.check-list li { padding-left: 30px; position: relative; margin-bottom: 0.7rem; color: var(--text-inverse-soft); }
.check-list li::before {
  content: '✓'; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 700;
}
.scan-card { position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); }
.scan-line {
  position: absolute; left: 0; right: 0; top: 0; height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 18px var(--accent);
  animation: scanMove 3.2s ease-in-out infinite;
}
@keyframes scanMove {
  0%, 100% { top: 4%; opacity: 0.9; }
  50% { top: 94%; opacity: 1; }
}

/* ---------- Casos de uso ---------- */
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.case-card {
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
  background: var(--paper); transition: transform 0.25s, box-shadow 0.25s; display: block;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-card img { width: 100%; }
.case-body { padding: 24px; }
.case-body p { color: var(--text-soft); font-size: 0.95rem; margin: 0.4rem 0 0.9rem; }
.case-link { color: var(--accent-deep); font-weight: 600; font-size: 0.9rem; }

/* ---------- Precios ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; align-items: stretch; }
.price-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 24px; display: flex; flex-direction: column; position: relative;
  transition: transform 0.25s, box-shadow 0.25s;
}
.price-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.price-card.featured {
  border: 2px solid var(--accent); box-shadow: 0 18px 50px rgba(16,185,129,0.18);
  transform: scale(1.03);
}
.price-flag {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(120deg, var(--accent), var(--accent-deep)); color: #fff;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 5px 14px; border-radius: 999px; white-space: nowrap;
}
.price { margin: 0.9rem 0 0.2rem; }
.price .amount { font-family: var(--font-head); font-size: 2.1rem; font-weight: 800; }
.price .period { color: var(--text-soft); font-size: 0.85rem; margin-left: 4px; }
.credits { color: var(--accent-deep); font-weight: 600; font-size: 0.9rem; margin-bottom: 1rem; }
.price-card ul { list-style: none; margin-bottom: 1.6rem; flex: 1; }
.price-card li { font-size: 0.88rem; color: var(--text-soft); padding: 5px 0 5px 24px; position: relative; }
.price-card li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--paper); padding: 0; overflow: hidden;
}
.faq-item summary {
  cursor: pointer; padding: 18px 22px; font-weight: 600; font-family: var(--font-head);
  font-size: 0.98rem; list-style: none; position: relative; padding-right: 48px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; position: absolute; right: 22px; top: 50%; transform: translateY(-50%);
  font-size: 1.3rem; color: var(--accent-deep); transition: transform 0.25s;
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item p { padding: 0 22px 18px; color: var(--text-soft); font-size: 0.95rem; }

/* ---------- Relacionados ---------- */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.related-card {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; display: block; transition: transform 0.25s, box-shadow 0.25s;
}
.related-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.related-card p { color: var(--text-soft); font-size: 0.9rem; margin: 0.4rem 0 0.8rem; }

/* ---------- CTA final ---------- */
.final-cta { padding: 110px 0; }
.final-cta .btn-lg { margin-top: 2rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--text-inverse-soft); padding: 70px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; border-bottom: 1px solid var(--border-dark); }
.footer-brand p { font-size: 0.9rem; margin-top: 1rem; max-width: 280px; }
.site-footer h4 { color: #fff; font-size: 0.9rem; margin-bottom: 1rem; }
.site-footer a { display: block; font-size: 0.88rem; padding: 4px 0; color: var(--text-inverse-soft); transition: color 0.2s; }
.site-footer a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-top: 26px; flex-wrap: wrap; }
.footer-bottom p { font-size: 0.82rem; }

/* ---------- Legal ---------- */
.legal-page h1 { margin-bottom: 0.4rem; }
.legal-page h2 { font-size: 1.25rem; margin-top: 2.2rem; }

/* ---------- Animaciones reveal ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-glow, .hero-phone, .scan-line { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid, .steps-grid, .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  .hero-grid, .demo-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 70px 0 90px; }
  .hero-phone { left: auto; right: 10px; bottom: -26px; width: 130px; }
  .main-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0; padding: 10px 24px 18px;
    border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 0; border-bottom: 1px solid var(--tint); }
  .menu-toggle { display: block; }
}
@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .benefits-grid, .steps-grid, .cases-grid, .pricing-grid, .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .price-card.featured { transform: none; }
  .hero-stats { gap: 24px; }
}