/* ============================================
   Constructora Andes — Sitio Institucional Clásico
   Plan Basic · Paleta clara: Blanco + Grises + Azul Pastel
   ============================================ */
:root {
  --bg-deep: #F8FAFC;
  --bg-panel: #F1F5F9;
  --bg-panel-2: #E8EEF5;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --accent: #3B82F6;
  --accent-light: #DBEAFE;
  --accent-dark: #1D4ED8;
  --accent-gradient: linear-gradient(135deg, #3B82F6, #60A5FA);
  --border: rgba(15, 23, 42, 0.06);
  --border-light: rgba(15, 23, 42, 0.03);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 20px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.08);
  --font-display: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 1.5rem; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; }
img { max-width: 100%; display: block; }

/* ── Header ── */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s ease;
}
header.scrolled {
  box-shadow: var(--shadow-sm);
}
header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}
.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
nav.main-nav a {
  position: relative;
  font-size: 0.87rem;
  color: var(--text-secondary);
  padding-bottom: 4px;
  font-weight: 500;
  transition: color 0.25s ease;
}
nav.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.25s ease;
  border-radius: 2px;
}
nav.main-nav a:hover {
  color: var(--text-primary);
}
nav.main-nav a:hover::after {
  transform: scaleX(1);
}
nav.main-nav a.active {
  color: var(--text-primary);
}
nav.main-nav a.active::after {
  transform: scaleX(1);
}

.nav-cta {
  background: var(--accent-gradient);
  color: #fff !important;
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.nav-cta::after {
  display: none !important;
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 0.4rem;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: 0.3s ease;
}

/* ── Hero genérico ── */
.page-hero {
  position: relative;
  padding: 5rem 0 4rem;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-panel) 100%);
}
.page-hero .wrap {
  position: relative;
  z-index: 2;
}
.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 0.2rem 0.8rem;
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.04);
  margin-bottom: 1.25rem;
}
.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 4.5vw, 3.2rem);
  letter-spacing: -0.02em;
  max-width: 680px;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}
.page-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.8;
}

/* ── Botones ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  padding: 0.9rem 2.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 12px 30px -10px rgba(59, 130, 246, 0.35);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -12px rgba(59, 130, 246, 0.45);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 0.9rem 2.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.04);
}

/* ── Secciones genéricas ── */
section {
  padding: 5rem 0;
}
section:not(:first-of-type) {
  border-top: 1px solid var(--border);
}

.section-head {
  max-width: 600px;
  margin-bottom: 3rem;
}
.section-head .eyebrow {
  margin-bottom: 0.8rem;
}
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}
.section-head p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* ── Tarjetas ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.card {
  padding: 2.25rem 1.75rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: var(--shadow-sm);
}
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(59, 130, 246, 0.15);
  box-shadow: var(--shadow-md);
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-gradient);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
}
.card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}
.card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Stats ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}
.stat-item .stat-number {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.5rem;
  color: var(--accent);
  line-height: 1.1;
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0 2.25rem;
  background: var(--bg-panel);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.25rem;
}
.footer-brand .logo {
  font-size: 1rem;
}
.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  max-width: 300px;
  line-height: 1.7;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  transition: color 0.2s ease;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ── Scroll-reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 680px) {
  nav.main-nav {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1.25rem;
    transform: translateY(-130%);
    transition: transform 0.3s ease;
    z-index: 49;
    box-shadow: var(--shadow-lg);
  }
  nav.main-nav.open {
    transform: translateY(0);
  }
  .nav-toggle {
    display: flex;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  .stat-item .stat-number {
    font-size: 2rem;
  }
  .page-hero {
    padding: 3rem 0 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}