/* 
  Estilos CSS Vainilla para CoreBasque.ia - Consultoría IA & SEO B2B
  Estética: Premium CEO, Dark Mode, High Contrast, Autoridad
*/

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Colors - Deep Rich Black & Charcoal */
  --bg-color: #000000;
  --bg-darker: #050505;
  --surface: #0a0a0a;
  --surface-light: rgba(255, 255, 255, 0.04);
  --border-color: rgba(255, 255, 255, 0.12);
  --text-main: #f5f5f7; /* Apple's off-white */
  --text-muted: #86868b; /* Apple's space gray text */
  
  /* Brand Accents - Premium Sapphire & Slate Blue */
  --accent-blue: #60a5fa; /* A clean, serious light blue */
  --accent-glow: rgba(96, 165, 250, 0.2); /* Subtle blue glow */
  --accent-gradient: linear-gradient(135deg, #93c5fd, #3b82f6, #1e3a8a); /* Deep corporate blue to soft metallic blue */
  
  /* Typography */
  --font-family: 'Outfit', system-ui, -apple-system, sans-serif;
  
  /* Transitions & Radii */
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

/* =========================================================================
   Typography & Utilities
   ========================================================================= */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

.text-accent {
  color: var(--accent-blue);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 600px;
}

.center {
  text-align: center;
}
.center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

.bg-darker {
  background-color: var(--bg-darker);
}

/* Glassmorphism Classes */
.glass-panel, .glass-card {
  background: var(--surface-light);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #000000; /* Dark text for contrast */
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.15), inset 0 1px 0 rgba(255,255,255,0.3);
  border-radius: 50px; /* Apple style pill button */
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  backdrop-filter: blur(8px);
  border-radius: 50px;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(255,255,255,0.05);
}

.btn-outline {
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-main);
}
.btn-outline:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* =========================================================================
   Navbar
   ========================================================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1rem 0;
  z-index: 100;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.05em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links a:hover {
  color: var(--text-main);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin-bottom: 5px;
  transition: var(--transition);
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* simple mobile hide for now, JS handles toggle if implemented */
  }
  .navbar .btn {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
}

/* =========================================================================
   Hero Section
   ========================================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 70vw;
  height: 70vw;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 50%);
  filter: blur(100px);
  z-index: -1;
  opacity: 1;
}

.hero-content {
  text-align: center;
  max-width: 800px;
}

.badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  background: var(--surface-light);
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-blue);
  margin-bottom: 2rem;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 4.5rem);
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

@media (max-width: 500px) {
  .hero-actions {
    flex-direction: column;
  }
}

/* =========================================================================
   Trust Badges
   ========================================================================= */
.trust-badges {
  padding: 4rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: var(--surface);
  text-align: center;
}

.trust-title {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}

.logos-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.logo-item {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text-muted);
  opacity: 0.5;
  filter: grayscale(100%);
  transition: var(--transition);
}

.logo-item:hover {
  opacity: 1;
  color: var(--text-main);
}

/* =========================================================================
   Split Layouts (Exclusividad / FAQ)
   ========================================================================= */
section {
  padding: 8rem 0;
}

.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.split-layout.align-start {
  align-items: start;
}

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

.check-list li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-blue);
  font-weight: bold;
}

.split-visual {
  padding: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.stat-box {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.stat-box:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-blue);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* =========================================================================
   Servicios (Cards Grid)
   ========================================================================= */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 4rem;
}

.card {
  padding: 2.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.6s ease;
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 40px var(--accent-glow);
}

.card-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card p {
  color: var(--text-muted);
}

/* =========================================================================
   FAQ
   ========================================================================= */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--surface);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.125rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--surface-light);
}

.faq-question .icon {
  font-size: 1.5rem;
  font-weight: 400;
  transition: var(--transition);
}

.faq-item.active .faq-question .icon {
  transform: rotate(45deg);
  color: var(--accent-blue);
}

.faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-answer {
  padding: 0 1.5rem 1.5rem 1.5rem;
}

/* =========================================================================
   Formulario de Admisión
   ========================================================================= */
.cta-form-section {
  position: relative;
}

.form-container {
  padding: 4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

@media (max-width: 900px) {
  .form-container {
    grid-template-columns: 1fr;
    padding: 2rem;
  }
}

.admission-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-group.full-width {
  grid-column: 1 / -1;
}

.admission-form label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.admission-form input,
.admission-form textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.admission-form input:focus,
.admission-form textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: rgba(0, 0, 0, 0.6);
  box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

.full-width.btn {
  grid-column: 1 / -1;
}

.form-note {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* =========================================================================
   Footer
   ========================================================================= */
footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  color: var(--text-muted);
  margin-top: 1rem;
  max-width: 300px;
}

.footer-links h4 {
  margin-bottom: 1.5rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text-main);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* =========================================================================
   Animations Utilities
   ========================================================================= */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in {
  opacity: 0;
  transition: opacity 1s ease;
}

.fade-up.visible,
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }