/* CostaGuard CL - Coastal Corrosion Protection Website */
/* Design System with Salt-Spray Mesh Animation */

/* CSS Variables - Color Palette */
:root {
  --ocean-blue: #2F6B9A;
  --seafoam: #20C6B7;
  --sand: #E7D8B1;
  --graphite: #1A2230;
  --soft-gray: #A7B0BD;
  --white: #FFFFFF;
  --light-bg: #F8F9FA;
  --dark-bg: #1A2230;
  
  /* Typography Scale */
  --font-xs: 0.75rem;    /* 12px */
  --font-sm: 0.875rem;   /* 14px */
  --font-base: 1rem;     /* 16px */
  --font-lg: 1.125rem;   /* 18px */
  --font-xl: 1.25rem;    /* 20px */
  --font-2xl: 1.5rem;    /* 24px */
  --font-3xl: 2.25rem;   /* 36px */
  --font-4xl: 3.1rem;    /* 49.6px */
  
  /* Spacing */
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  
  /* Layout */
  --max-width: 1200px;
  --gutter: 20px;
  --border-radius: 16px;
  --shadow: 0 12px 28px rgba(0,0,0,.24);
  --transition: 160ms ease;
  --transition-slow: 220ms ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--graphite);
  background: var(--light-bg);
  overflow-x: hidden;
}

/* Salt-Spray Mesh Animated Background */
.salt-spray-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(135deg, var(--ocean-blue) 0%, var(--seafoam) 50%, var(--sand) 100%);
  opacity: 0.1;
}

.salt-spray-mesh::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(255,255,255,0.3) 2px, transparent 2px),
    radial-gradient(circle at 75% 75%, rgba(255,255,255,0.2) 1px, transparent 1px),
    radial-gradient(circle at 75% 25%, rgba(255,255,255,0.1) 1.5px, transparent 1.5px),
    radial-gradient(circle at 25% 75%, rgba(255,255,255,0.4) 1px, transparent 1px);
  background-size: 120px 120px, 80px 80px, 160px 160px, 200px 200px;
  animation: saltSprayFloat 20s infinite ease-in-out;
}

@keyframes saltSprayFloat {
  0%, 100% { 
    transform: translate(0, 0) rotate(0deg);
    opacity: 0.1;
  }
  25% { 
    transform: translate(-20px, -15px) rotate(1deg);
    opacity: 0.15;
  }
  50% { 
    transform: translate(15px, -25px) rotate(-0.5deg);
    opacity: 0.08;
  }
  75% { 
    transform: translate(-10px, 10px) rotate(0.8deg);
    opacity: 0.12;
  }
}

/* Typography */
h1 { font-size: var(--font-4xl); line-height: 1.2; font-weight: 700; }
h2 { font-size: var(--font-3xl); line-height: 1.3; font-weight: 600; }
h3 { font-size: var(--font-2xl); line-height: 1.4; font-weight: 600; }
h4 { font-size: var(--font-xl); line-height: 1.4; font-weight: 500; }
h5 { font-size: var(--font-lg); line-height: 1.5; font-weight: 500; }
h6 { font-size: var(--font-base); line-height: 1.5; font-weight: 500; }

p { font-size: var(--font-base); line-height: 1.6; margin-bottom: var(--space-4); }

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

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-12 {
  grid-template-columns: repeat(12, 1fr);
}

.grid-8 {
  grid-template-columns: repeat(8, 1fr);
}

.grid-6 {
  grid-template-columns: repeat(6, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

/* Header and Navigation */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
}

.logo {
  font-size: var(--font-2xl);
  font-weight: 700;
  color: var(--ocean-blue);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo::before {
  content: '';
  width: 32px;
  height: 32px;
  background: linear-gradient(45deg, var(--ocean-blue), var(--seafoam));
  border-radius: 50%;
  display: inline-block;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-8);
}

.nav-menu a {
  text-decoration: none;
  color: var(--graphite);
  font-weight: 500;
  transition: var(--transition);
  padding: var(--space-2) var(--space-4);
  border-radius: 8px;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--ocean-blue);
  background: rgba(47, 107, 154, 0.1);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.hamburger {
  width: 24px;
  height: 2px;
  background: var(--graphite);
  position: relative;
  transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--graphite);
  transition: var(--transition);
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

/* Hero Section */
.hero {
  background: linear-gradient(135deg, rgba(47, 107, 154, 0.9), rgba(32, 198, 183, 0.8)), url('../assets/images/modern_coastal_house_chile_seaside_hero_background.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--white);
  padding: var(--space-20) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: shimmer 15s infinite linear;
}

@keyframes shimmer {
  0% { transform: translateX(0); }
  100% { transform: translateX(50px); }
}

.hero h1 {
  margin-bottom: var(--space-6);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  font-size: var(--font-lg);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.btn {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  background: var(--seafoam);
  color: var(--white);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: var(--font-base);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn:hover {
  background: var(--ocean-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(47, 107, 154, 0.3);
}

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

.btn-outline:hover {
  background: var(--white);
  color: var(--ocean-blue);
}

.btn-large {
  padding: var(--space-6) var(--space-12);
  font-size: var(--font-lg);
}

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

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.card-content {
  padding: var(--space-6);
}

.card-title {
  font-size: var(--font-xl);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--graphite);
}

.card-excerpt {
  color: var(--soft-gray);
  margin-bottom: var(--space-4);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-sm);
  color: var(--soft-gray);
}

/* Sections */
.section {
  padding: var(--space-16) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: var(--font-3xl);
  color: var(--graphite);
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--font-lg);
  color: var(--soft-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Stats Section */
.stats {
  background: var(--ocean-blue);
  color: var(--white);
  padding: var(--space-12) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: var(--font-4xl);
  font-weight: 700;
  display: block;
  color: var(--seafoam);
}

.stat-label {
  font-size: var(--font-base);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: var(--space-2);
}

/* Advantages Grid */
.advantages {
  background: var(--light-bg);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
}

.advantage-item {
  background: var(--white);
  padding: var(--space-8);
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.advantage-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  background: linear-gradient(45deg, var(--ocean-blue), var(--seafoam));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--font-2xl);
}

/* Reviews Section */
.reviews {
  background: var(--dark-bg);
  color: var(--white);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
}

.review-item {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--space-8);
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
}

.review-text {
  font-style: italic;
  margin-bottom: var(--space-4);
  font-size: var(--font-lg);
  line-height: 1.7;
}

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

/* Newsletter Section */
.newsletter {
  background: linear-gradient(135deg, var(--ocean-blue), var(--seafoam));
  color: var(--white);
  text-align: center;
  padding: var(--space-12) 0;
}

.newsletter-form {
  display: flex;
  max-width: 500px;
  margin: var(--space-8) auto 0;
  gap: var(--space-4);
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-4);
  border: none;
  border-radius: 25px;
  font-size: var(--font-base);
}

.newsletter-form input:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}

.success-message {
  background: rgba(255,255,255,0.2);
  padding: var(--space-4);
  border-radius: 8px;
  margin-top: var(--space-4);
  display: none;
  animation: slideIn var(--transition);
}

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

/* Footer */
.footer {
  background: var(--graphite);
  color: var(--white);
  padding: var(--space-12) 0 var(--space-6);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h4 {
  margin-bottom: var(--space-4);
  color: var(--seafoam);
}

.footer-section p,
.footer-section a {
  color: var(--soft-gray);
  text-decoration: none;
  line-height: 1.8;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--space-6);
  border-top: 1px solid rgba(167, 176, 189, 0.2);
  color: var(--soft-gray);
}

/* Categories Section */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.category-card {
  background: var(--white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.category-card-image {
  height: 200px;
  background-size: cover;
  background-position: center;
}

.category-card-content {
  padding: var(--space-6);
}

/* Article Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--ocean-blue);
  color: var(--white);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  cursor: pointer;
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 1000;
}

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

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

/* Scroll Reveal Animation */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: var(--transition-slow);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --font-4xl: 2.5rem;
    --font-3xl: 1.875rem;
    --gutter: 16px;
  }
  
  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: var(--space-6);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
  }
  
  .nav-menu.active {
    top: 100%;
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .mobile-menu-toggle.active .hamburger {
    background: transparent;
  }
  
  .mobile-menu-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
  }
  
  .mobile-menu-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
  }
  
  .hero {
    padding: var(--space-16) 0;
    background-attachment: scroll;
  }
  
  .newsletter-form {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .grid-12,
  .grid-8,
  .grid-6,
  .grid-4,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --space-20: 3rem;
    --space-16: 2.5rem;
    --space-12: 2rem;
  }
  
  .hero h1 {
    font-size: var(--font-3xl);
  }
  
  .container {
    padding: 0 var(--space-3);
  }
}