:root {
  --color-pine: #2C3E2F;
  --color-granite: #7A8791;
  --color-amber: #C28F52;
  --color-sky: #8DAA9D;
  --color-canvas: #F5F3EE;
  
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  
  --transition-smooth: 160ms ease;
  --transition-bounce: 220ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  --shadow-card: 0 12px 28px rgba(0,0,0,0.22);
  --shadow-hover: 0 14px 30px rgba(0,0,0,0.24);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--color-pine);
  background-color: var(--color-canvas);
  overflow-x: hidden;
}

.topo-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.03;
  pointer-events: none;
}

.topo-lines {
  position: absolute;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 50px,
    var(--color-pine) 50px,
    var(--color-pine) 52px
  );
  animation: topo-flow 30s linear infinite;
}

.topo-lines::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 50px,
    var(--color-sky) 50px,
    var(--color-sky) 52px
  );
  animation: topo-flow 40s linear infinite reverse;
}

@keyframes topo-flow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(50px, 50px); }
}

.compass-glow {
  position: fixed;
  width: 4px;
  height: 4px;
  background: var(--color-amber);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-amber), 0 0 20px var(--color-amber);
  z-index: 1;
  animation: compass-pulse 3s ease-in-out infinite;
}

@keyframes compass-pulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.3);
  }
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 243, 238, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(44, 62, 47, 0.1);
  transition: all var(--transition-smooth);
}

.header-scrolled {
  box-shadow: var(--shadow-card);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-pine);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--color-amber);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-menu a {
  color: var(--color-pine);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-smooth);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-amber);
  transition: width var(--transition-smooth);
}

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

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

.burger-menu {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.burger-menu span {
  width: 25px;
  height: 3px;
  background: var(--color-pine);
  transition: all var(--transition-smooth);
}

main {
  position: relative;
  z-index: 2;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: linear-gradient(135deg, rgba(44, 62, 47, 0.05) 0%, rgba(141, 170, 157, 0.05) 100%);
}

.hero-content {
  max-width: 800px;
  padding: 3rem 0;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
  line-height: 1.1;
}

.hero p {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--color-granite);
  margin-bottom: 2.5rem;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: var(--color-pine);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-card);
}

.cta-button:hover {
  background: var(--color-amber);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  font-size: clamp(2rem, 4vw, 3.1rem);
  font-weight: 700;
  margin-bottom: 3rem;
  letter-spacing: -0.5px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.stat-card {
  text-align: center;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-smooth);
}

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

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-amber);
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--color-granite);
  font-size: 1.1rem;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.article-card {
  background: white;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-smooth);
  cursor: pointer;
}

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

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

.article-content {
  padding: 1.5rem;
}

.article-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.badge {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-sky);
  color: white;
}

.badge.advanced {
  background: var(--color-amber);
}

.badge.seasonal {
  background: var(--color-pine);
}

.article-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.article-card p {
  color: var(--color-granite);
  margin-bottom: 1rem;
}

.read-more {
  color: var(--color-pine);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition-smooth);
}

.read-more:hover {
  color: var(--color-amber);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.advantage-card {
  display: flex;
  gap: 1.5rem;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-smooth);
}

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

.advantage-icon {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
}

.advantage-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.advantage-content p {
  color: var(--color-granite);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.review-card {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-smooth);
}

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

.review-stars {
  color: var(--color-amber);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.review-text {
  font-style: italic;
  color: var(--color-granite);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

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

.newsletter {
  background: linear-gradient(135deg, var(--color-pine) 0%, var(--color-sky) 100%);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  border-radius: 20px;
  margin: 3rem 0;
}

.newsletter h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.newsletter p {
  margin-bottom: 2rem;
  opacity: 0.9;
}

.newsletter-form {
  display: flex;
  gap: 1rem;
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-form input {
  flex: 1;
  padding: 1rem;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
}

.newsletter-form button {
  padding: 1rem 2rem;
  background: var(--color-amber);
  color: white;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.newsletter-form button:hover {
  background: #d19a5f;
  transform: translateY(-2px);
}

.category-header {
  background: linear-gradient(135deg, var(--color-pine) 0%, var(--color-sky) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.category-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.category-description {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto;
  opacity: 0.9;
}

.category-filter {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 3rem 0;
}

.filter-chip {
  padding: 0.5rem 1.5rem;
  background: white;
  border: 2px solid var(--color-granite);
  border-radius: 25px;
  color: var(--color-granite);
  cursor: pointer;
  transition: all var(--transition-smooth);
  font-weight: 500;
}

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

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--color-pine);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--color-amber);
  transform: translateY(-3px);
}

footer {
  background: var(--color-pine);
  color: white;
  padding: 3rem 0 1rem;
  margin-top: 5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-amber);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  margin-bottom: 0.5rem;
  display: block;
  transition: color var(--transition-smooth);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: white;
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow-card);
    padding: 2rem 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .burger-menu {
    display: flex;
  }

  .burger-menu.active span:nth-child(2) {
    opacity: 0;
  }

  .burger-menu.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .burger-menu.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero {
    min-height: 70vh;
  }

  .articles-grid,
  .advantages-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .category-filter {
    gap: 0.5rem;
  }

  .filter-chip {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 3rem 0;
  }

  .hero-content {
    padding: 2rem 0;
  }

  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .article-card {
    max-width: 100%;
  }
}