/* ===================================
   Papai Solar - Landing Pages CSS
   Design System Otimizado para SEO
   =================================== */

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

:root {
  /* Cores */
  --primary: #0175C2;
  --primary-dark: #015A99;
  --secondary: #FF8C00;
  --secondary-dark: #E67E00;
  --text-dark: #1A1A1A;
  --text-medium: #4A4A4A;
  --text-light: #707070;
  --bg-light: #F5F7FB;
  --bg-white: #FFFFFF;
  --border-light: #E0E0E0;
  --success: #28A745;
  
  /* Tipografia */
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  
  /* Espaçamento */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Breakpoints */
  --mobile: 768px;
  --tablet: 1024px;
  --desktop: 1440px;
  
  /* Sombras */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
  
  /* Transições */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-system);
  color: var(--text-dark);
  line-height: var(--line-height-base);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Tipografia */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

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

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

a:hover {
  color: var(--primary-dark);
}

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

.container-narrow {
  max-width: 900px;
}

/* Header */
.header {
  background: var(--bg-white);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav a {
  font-weight: 500;
  color: var(--text-medium);
  transition: color var(--transition-fast);
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--bg-white);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--bg-white);
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.95);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-image {
  margin-top: var(--spacing-xl);
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  text-align: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--secondary);
  color: var(--bg-white);
}

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

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

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

.btn-large {
  padding: 1.25rem 2.5rem;
  font-size: 1.25rem;
}

/* Sections */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-alt {
  background: var(--bg-light);
}

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

.section-subtitle {
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Cards */
.card {
  background: var(--bg-white);
  border-radius: 12px;
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

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

/* Problem/Solution Section */
.problem-solution {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}

.problem-box {
  background: linear-gradient(135deg, #FFE5E5 0%, #FFD5D5 100%);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border-left: 4px solid #FF4444;
}

.solution-box {
  background: linear-gradient(135deg, #E5F5E5 0%, #D5EFD5 100%);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border-left: 4px solid var(--success);
}

/* Features List */
.features-list {
  list-style: none;
  padding: 0;
}

.features-list li {
  padding: var(--spacing-sm) 0;
  padding-left: 2rem;
  position: relative;
  color: var(--text-medium);
}

.features-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
  font-size: 1.5rem;
}

/* Steps */
.steps {
  counter-reset: step;
}

.step {
  position: relative;
  padding-left: 4rem;
  margin-bottom: var(--spacing-xl);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 3rem;
  height: 3rem;
  background: var(--primary);
  color: var(--bg-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  color: var(--text-medium);
  font-size: 1.125rem;
}

/* CTA Section */
.cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--bg-white);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  border-radius: 16px;
  margin: var(--spacing-2xl) 0;
}

.cta h2 {
  color: var(--bg-white);
}

.cta p {
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
}

/* Breadcrumbs */
.breadcrumbs {
  padding: var(--spacing-md) 0;
  color: var(--text-light);
  font-size: 0.875rem;
}

.breadcrumbs a {
  color: var(--text-light);
}

.breadcrumbs a:hover {
  color: var(--primary);
}

.breadcrumbs span {
  margin: 0 var(--spacing-xs);
}

/* Related Features */
.related-features {
  background: var(--bg-light);
  padding: var(--spacing-xl) 0;
}

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

.related-card {
  background: var(--bg-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  text-align: center;
  transition: transform var(--transition-normal);
}

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

.related-card h4 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
  background: var(--text-dark);
  color: var(--bg-white);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

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

.footer-section h4 {
  color: var(--bg-white);
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    gap: var(--spacing-md);
    font-size: 0.875rem;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .step {
    padding-left: 3.5rem;
  }
  
  .step::before {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.25rem;
  }
}

/* Utilities */
.text-center {
  text-align: center;
}

.text-primary {
  color: var(--primary);
}

.text-secondary {
  color: var(--secondary);
}

.mt-0 { margin-top: 0; }
.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-0 { margin-bottom: 0; }
.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); }

.hidden { display: none; }

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