/* ============================================
   ROOT - VARIABLES GLOBALES
============================================ */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #DBEAFE;
  --dark: #0F172A;
  --dark-soft: #1E293B;
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-700: #334155;
  --success: #10B981;
  --warning: #F59E0B;
  --accent-green: #22C55E;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE / RESET
============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--white);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* ============================================
   TYPOGRAPHY
============================================ */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 800;
}

p {
  line-height: 1.7;
}

/* ============================================
   NAVBAR
============================================ */
.navbar {
  width: 100%;
  padding: 16px 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.5);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}

.nav-container {
  width: min(1200px, 92%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--dark);
  font-weight: 800;
  font-size: 1.05rem;
  white-space: nowrap;
  transition: var(--transition);
}

.nav-brand:hover {
  color: var(--primary);
}

.nav-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: contain;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  color: var(--gray-500);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--dark);
  cursor: pointer;
}

/* ============================================
   BOTONES
============================================ */
.btn-login,
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-weight: 700;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
}

.btn-login {
  padding: 12px 20px;
  background: var(--primary);
  color: var(--white);
}

.btn-login:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary {
  padding: 14px 28px;
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  padding: 14px 28px;
  border: 2px solid var(--gray-300);
  color: var(--dark);
  background: transparent;
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.course-link {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  transition: var(--transition);
}

.course-link:hover {
  gap: 12px;
  color: var(--primary-dark);
}

/* ============================================
   HERO
============================================ */
.hero {
  padding: 100px 0 80px;
  background:
    radial-gradient(circle at 100% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 0% 0%, rgba(34, 197, 94, 0.06) 0%, transparent 30%),
    linear-gradient(to bottom, var(--white) 0%, var(--gray-50) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
}

.hero-content {
  width: min(1200px, 92%);
  margin: 0 auto;
  text-align: center;
  animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 22px;
  animation: slideDown 0.6s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.08rem;
  color: var(--gray-500);
  max-width: 650px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 0 20px;
}

/* ============================================
   SECCIONES
============================================ */
section {
  padding: 90px 0;
  position: relative;
}

.section-head {
  width: min(1200px, 92%);
  margin: 0 auto 50px;
  text-align: center;
}

.section-head span {
  display: inline-block;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   WHY SECTION
============================================ */
.why {
  background: var(--white);
}

.why-grid {
  width: min(1200px, 92%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.why-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-green));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.why-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
  border-color: var(--primary-light);
}

.why-card:hover::before {
  opacity: 1;
}

.why-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 18px;
  transition: var(--transition);
}

.why-card:hover .why-icon {
  transform: scale(1.1);
  background: var(--primary);
  color: var(--white);
}

.why-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.why-card p {
  color: var(--gray-500);
  font-size: 0.95rem;
}

/* ============================================
   COURSES SECTION
============================================ */
.courses {
  background: var(--gray-50);
}

.course-grid {
  width: min(1200px, 92%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.course-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
  border-color: var(--primary-light);
}

.course-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
  width: fit-content;
}

.course-tag.popular {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.course-tag.nuevo {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
}

.course-tag.top {
  background: rgba(249, 158, 11, 0.1);
  color: var(--warning);
}

.course-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.course-card p {
  color: var(--gray-500);
  margin-bottom: auto;
  font-size: 0.95rem;
}

/* ============================================
   HOW SECTION
============================================ */
.how {
  background: var(--white);
}

.steps-grid {
  width: min(1200px, 92%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.step-card {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: 20px;
  padding: 28px;
  transition: var(--transition);
  position: relative;
}

.step-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.step-number {
  display: inline-block;
  color: var(--primary);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--dark);
}

.step-card p {
  color: var(--gray-500);
  font-size: 0.95rem;
}

/* ============================================
   CTA SECTION
============================================ */
.cta {
  padding: 60px 0;
}

.cta-box {
  width: min(1200px, 92%);
  margin: 0 auto;
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-soft) 100%);
  color: var(--white);
  border-radius: 28px;
  padding: 60px 30px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.2);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-box::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -30%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-box h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 24px;
  font-size: 1.05rem;
  position: relative;
  z-index: 1;
}

.cta-box .btn-primary {
  position: relative;
  z-index: 1;
}

/* ============================================
   FOOTER
============================================ */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: 70px 0 30px;
}

.footer-content {
  width: min(1200px, 92%);
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
}

.footer-col h3,
.footer-col h4 {
  margin-bottom: 14px;
  font-size: 1rem;
}

.footer-col p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 10px;
  font-size: 0.95rem;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--primary);
  margin-left: 4px;
}

.footer-bottom {
  width: min(1200px, 92%);
  margin: 0 auto;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE DESIGN
============================================ */
@media (max-width: 1024px) {
  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }

  .navbar {
    padding: 12px 0;
  }

  .hero {
    padding: 70px 0 50px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-secondary,
  .btn-login {
    width: 100%;
  }

  .why-grid,
  .course-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .cta-box {
    padding: 40px 20px;
  }

  .cta-box h2 {
    font-size: 1.6rem;
  }

  .footer-content {
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .nav-container {
    gap: 8px;
  }

  .nav-brand span {
    display: none;
  }

  .nav-logo {
    width: 36px;
    height: 36px;
  }

  .hero {
    padding: 60px 0 40px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .hero-badge {
    font-size: 0.75rem;
    padding: 8px 12px;
  }

  .why-card,
  .course-card,
  .step-card {
    padding: 20px;
  }

  .section-head {
    margin-bottom: 30px;
  }

  .section-head h2 {
    font-size: 1.4rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.hero-main-logo {
  width: min(520px, 90%);
  margin: 0 auto 28px;
  display: block;
  filter: drop-shadow(0 12px 30px rgba(37, 99, 235, 0.18));
}