/* PuffyAir Website Redesign - Main Stylesheet */

/* ===== VARIABLES ===== */
:root {
  /* Primary Colors */
  --sky-blue: #4CB9E7;
  --deep-blue: #3A86FF;
  --mint-green: #80ED99;
  
  /* Secondary Colors */
  --light-gray: #F8F9FA;
  --dark-gray: #343A40;
  --soft-purple: #9D4EDD;
  
  /* Functional Colors */
  --good: #38B000;
  --moderate: #FFD60A;
  --poor: #E5383B;
  
  /* Typography */
  --heading-font: 'Montserrat', sans-serif;
  --body-font: 'Inter', sans-serif;
  --mono-font: 'Roboto Mono', monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
}

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

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

body {
  font-family: var(--body-font);
  color: var(--dark-gray);
  background-color: var(--light-gray);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--dark-gray);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

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

a {
  color: var(--deep-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--sky-blue);
}

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

/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===== HEADER ===== */
.header {
  background: linear-gradient(135deg, var(--sky-blue), var(--deep-blue));
  color: white;
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

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

.logo {
  font-family: var(--heading-font);
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
}

.logo-img {
  height: 40px;
  width: auto;
  margin-right: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.logo-img-small {
  height: 30px;
  width: auto;
  margin-right: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.nav-menu {
  display: flex;
  list-style: none;
}

.nav-item {
  margin-left: var(--spacing-lg);
}

.nav-link {
  color: white;
  font-weight: 500;
  position: relative;
}

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

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

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

/* ===== HERO SECTION ===== */
.hero {
  background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)), 
              url('../images/air-pattern.svg');
  background-size: cover;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--deep-blue);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: var(--dark-gray);
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--deep-blue);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--sky-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: white;
  color: var(--deep-blue);
  border: 2px solid var(--deep-blue);
}

.btn-secondary:hover {
  background-color: var(--light-gray);
  transform: translateY(-2px);
}

/* ===== FEATURES SECTION ===== */
.features {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--deep-blue);
}

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

.feature-card {
  background-color: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin-bottom: var(--spacing-md);
  color: var(--sky-blue);
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

/* ===== HOW IT WORKS SECTION ===== */
.how-it-works {
  padding: var(--spacing-xl) 0;
  background-color: var(--light-gray);
}

.steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-top: var(--spacing-lg);
}

.step {
  flex: 1;
  min-width: 250px;
  text-align: center;
  padding: var(--spacing-md);
  position: relative;
}

.step:not(:last-child):after {
  content: '';
  position: absolute;
  top: 30px;
  right: 0;
  width: 50%;
  height: 2px;
  background-color: var(--sky-blue);
}

.step-number {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--sky-blue);
  color: white;
  font-weight: 700;
  margin: 0 auto var(--spacing-md);
  font-family: var(--mono-font);
}

.step-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

/* ===== BENEFITS SECTION ===== */
.benefits {
  padding: var(--spacing-xl) 0;
}

.benefits-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.benefit {
  flex: 1;
  min-width: 300px;
  display: flex;
  align-items: flex-start;
}

.benefit-icon {
  width: 50px;
  height: 50px;
  margin-right: var(--spacing-md);
  color: var(--mint-green);
}

.benefit-content h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

/* ===== COMMUNITY SECTION ===== */
.community {
  padding: var(--spacing-xl) 0;
  background-color: var(--light-gray);
  text-align: center;
}

.community-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.stat {
  background-color: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  min-width: 200px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--deep-blue);
  font-family: var(--mono-font);
}

.stat-label {
  font-size: 1rem;
  color: var(--dark-gray);
}

/* ===== CTA SECTION ===== */
.cta {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--sky-blue), var(--deep-blue));
  color: white;
  text-align: center;
}

.cta-content {
  max-width: 800px;
  margin: 0 auto;
}

.cta-title {
  color: white;
}

.app-badges {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.app-badge img {
  height: 50px;
}

/* ===== FOOTER ===== */
.footer {
  padding: var(--spacing-lg) 0;
  background-color: var(--dark-gray);
  color: white;
}

.footer-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.footer-logo {
  font-family: var(--heading-font);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
}

.footer-link {
  margin-bottom: var(--spacing-sm);
}

.footer-link a {
  color: var(--light-gray);
}

.footer-link a:hover {
  color: var(--sky-blue);
}

.footer-bottom {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--deep-blue);
    padding: var(--spacing-md) 0;
    flex-direction: column;
    align-items: center;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-item {
    margin: var(--spacing-sm) 0;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .cta-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .step:not(:last-child):after {
    display: none;
  }
  
  .footer-container {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--spacing-lg) 0;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .benefit {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .benefit-icon {
    margin-right: 0;
    margin-bottom: var(--spacing-sm);
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mt-4 {
  margin-top: var(--spacing-xl);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.mb-4 {
  margin-bottom: var(--spacing-xl);
}