/* Heatwave Preparedness Website - FrescoHogar CL */
/* Design System: Heatwave Mesh with Heat-Ripple Grid */

:root {
  /* Color Palette */
  --sunset-orange: #FF8A3D;
  --desert-sand: #E7D8B1;
  --deep-navy: #0B1220;
  --teal: #20C6B7;
  --soft-gray: #A7B0BD;
  --white: #ffffff;
  --black: #000000;
  
  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-sm: 0.833rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.2rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2.25rem;
  --font-size-3xl: 3.1rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Layout */
  --container-max: 1200px;
  --grid-gap: 20px;
  --card-radius: 16px;
  --card-shadow: 0 12px 28px rgba(0,0,0,.24);
  
  /* Motion */
  --transition-fast: 160ms ease;
  --transition-smooth: 220ms ease;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-system);
  line-height: 1.6;
  color: var(--deep-navy);
  background: linear-gradient(135deg, var(--desert-sand) 0%, var(--white) 100%);
  min-height: 100vh;
}

/* Heatwave Mesh Background Animation */
.heatwave-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: 
    linear-gradient(135deg, rgba(255, 138, 61, 0.1) 0%, rgba(231, 216, 177, 0.2) 100%),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,138,61,0.1)" stroke-width="0.5"/><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,138,61,0.05)" stroke-width="0.3"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  animation: heatwave-shimmer 20s ease-in-out infinite;
}

@keyframes heatwave-shimmer {
  0%, 100% { 
    background-position: 0% 50%, 0 0;
    opacity: 0.8;
  }
  25% { 
    background-position: 100% 50%, 20px 20px;
    opacity: 0.9;
  }
  50% { 
    background-position: 0% 50%, 40px 40px;
    opacity: 0.7;
  }
  75% { 
    background-position: -100% 50%, 60px 60px;
    opacity: 0.9;
  }
}

/* Container and Grid */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
  align-items: start;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 138, 61, 0.1);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: var(--container-max);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--sunset-orange);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--deep-navy);
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--sunset-orange);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--sunset-orange);
  transition: var(--transition-fast);
}

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

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.hamburger-line {
  width: 24px;
  height: 3px;
  background: var(--deep-navy);
  margin: 2px 0;
  transition: var(--transition-fast);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--desert-sand);
  padding: var(--spacing-lg);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  list-style: none;
}

.mobile-nav-link {
  text-decoration: none;
  color: var(--deep-navy);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
}

/* Typography */
h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: var(--transition-smooth);
  position: relative;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(0,0,0,.32);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--deep-navy);
}

.card-excerpt {
  color: var(--soft-gray);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: 8px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: var(--font-size-base);
}

.btn-primary {
  background: var(--sunset-orange);
  color: var(--white);
}

.btn-primary:hover {
  background: #e07a35;
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--teal);
  border: 2px solid var(--teal);
}

.btn-secondary:hover {
  background: var(--teal);
  color: var(--white);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-quick {
  background: var(--teal);
  color: var(--white);
}

.badge-energy {
  background: var(--sunset-orange);
  color: var(--white);
}

.badge-checklist {
  background: var(--soft-gray);
  color: var(--white);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--sunset-orange) 0%, var(--teal) 100%);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100"><defs><radialGradient id="heatwave" cx="50%" cy="50%" r="50%"><stop offset="0%" style="stop-color:rgba(255,255,255,0.1)"/><stop offset="100%" style="stop-color:rgba(255,255,255,0)"/></radialGradient></defs><rect width="100%" height="100%" fill="url(%23heatwave)"/></svg>');
  animation: heatwave-pulse 4s ease-in-out infinite;
}

@keyframes heatwave-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.1rem);
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  opacity: 0.9;
}

/* Statistics Section */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-3xl) 0;
}

.stat-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--white);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.stat-card:hover {
  transform: translateY(-4px);
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--sunset-orange);
  display: block;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--soft-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: var(--spacing-sm);
}

/* Filter Chips */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  justify-content: center;
}

.chip {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 2px solid var(--teal);
  border-radius: 25px;
  background: transparent;
  color: var(--teal);
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.chip:hover,
.chip.active {
  background: var(--teal);
  color: var(--white);
}

/* Grid Layouts */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--white);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  color: var(--teal);
}

/* Reviews Section */
.reviews {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
}

.review-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  position: relative;
}

.review-text {
  font-style: italic;
  margin-bottom: var(--spacing-md);
  color: var(--soft-gray);
}

.review-author {
  font-weight: 600;
  color: var(--deep-navy);
}

/* Newsletter */
.newsletter {
  background: linear-gradient(135deg, var(--teal) 0%, var(--sunset-orange) 100%);
  color: var(--white);
  padding: var(--spacing-3xl) var(--spacing-xl);
  border-radius: var(--card-radius);
  margin: var(--spacing-3xl) 0;
  text-align: center;
}

.newsletter-form {
  display: flex;
  max-width: 400px;
  margin: var(--spacing-lg) auto 0;
  gap: var(--spacing-sm);
}

.newsletter-input {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  border-radius: 8px;
  font-size: var(--font-size-base);
}

/* Footer */
.footer {
  background: var(--deep-navy);
  color: var(--white);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  color: var(--teal);
  margin-bottom: var(--spacing-md);
}

.footer-section a {
  color: var(--desert-sand);
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-sm);
  transition: var(--transition-fast);
}

.footer-section a:hover {
  color: var(--sunset-orange);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--soft-gray);
}

/* Scroll Reveal Animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background: var(--sunset-orange);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #e07a35;
  transform: translateY(-2px);
}

/* Preloader */
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--white);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-heatwave {
  width: 80px;
  height: 80px;
  border: 4px solid var(--desert-sand);
  border-top: 4px solid var(--sunset-orange);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-menu.active {
    display: block;
  }
  
  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .stats {
    grid-template-columns: 1fr;
  }
  
  .filter-chips {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
  }
  
  .chip {
    white-space: nowrap;
    flex-shrink: 0;
  }
}

/* Focus States for Accessibility */
*:focus {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

button:focus,
.btn:focus {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --card-shadow: 0 8px 16px rgba(0,0,0,0.8);
  }
  
  .card {
    border: 2px solid var(--deep-navy);
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .heatwave-bg {
    animation: none;
  }
}