:root {
  --color-primary: #2F3E46;
  --color-secondary: #354F52;
  --color-accent: #1A2A3A;
  --color-neutral: #F8F9FA;
  --color-text: #1a1a1a;
  --color-text-light: #555555;
  --color-white: #ffffff;
  
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'DM Serif Display', serif;
  
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 16px;
  --spacing-4: 24px;
  --spacing-5: 32px;
  --spacing-6: 48px;
  --spacing-7: 64px;
  --spacing-8: 96px;

  --border-radius: 8px;
}

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-neutral);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
p { margin-bottom: var(--spacing-3); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover, a:focus {
  color: var(--color-secondary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.btn {
  display: inline-block;
  background-color: var(--color-secondary);
  color: var(--color-white);
  padding: var(--spacing-3) var(--spacing-5);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  border: 2px solid var(--color-secondary);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn:hover, .btn:focus {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

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

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

.btn-primary-high-contrast {
  display: inline-block;
  background-color: var(--color-white);
  color: var(--color-accent);
  padding: var(--spacing-3) var(--spacing-5);
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  border: 2px solid var(--color-white);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary-high-contrast:hover, .btn-primary-high-contrast:focus {
  background-color: var(--color-neutral);
  color: var(--color-accent);
}

header {
  background-color: var(--color-white);
  padding: var(--spacing-3) 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--color-secondary);
}

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

.logo img {
  height: 40px;
  width: auto;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
}

nav a {
  font-weight: 500;
}

/* Sections */
section {
  padding: var(--spacing-8) 0;
}

.hero {
  position: relative;
  background-color: var(--color-primary);
  text-align: center;
  padding: 120px 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
}

.hero-video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(47, 62, 70, 0.5);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1, .hero h2 {
  color: var(--color-white);
}

.hero p {
  font-size: 1.25rem;
  max-width: 800px;
  margin: 0 auto var(--spacing-5);
  color: var(--color-neutral);
}

.hero .btn {
  /* Using specific classes now */
}

.problem {
  background-color: var(--color-white);
  text-align: center;
}

.problem h2 {
  color: var(--color-accent);
}

.features {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

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

.features-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
  margin-top: var(--spacing-6);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.feature-card {
  background: var(--color-white);
  color: var(--color-text);
  padding: var(--spacing-5);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  text-align: center;
  border-left: 4px solid var(--color-secondary);
}

.feature-card img {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-4);
}

.pricing {
  background-color: var(--color-white);
  text-align: center;
}

.pricing-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
  margin-top: var(--spacing-6);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background: var(--color-neutral);
  padding: var(--spacing-6);
  border-radius: var(--border-radius);
  border: 1px solid #e0e0e0;
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-2);
}

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.pricing-card ul {
  list-style: none;
  margin-bottom: var(--spacing-5);
  text-align: left;
}

.pricing-card li {
  margin-bottom: var(--spacing-2);
  padding-left: var(--spacing-4);
  position: relative;
}

.pricing-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
}

.faq {
  background-color: var(--color-neutral);
}

.faq-item {
  background: var(--color-white);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-3);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.faq-item h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-2);
}

.faq-item p {
  margin-bottom: 0;
  color: var(--color-text-light);
}

footer {
  background-color: var(--color-accent);
  color: var(--color-white);
  padding: var(--spacing-6) 0 var(--spacing-4);
  text-align: center;
}

footer a {
  color: var(--color-neutral);
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.footer-copy {
  color: #999;
  font-size: 0.875rem;
}

/* Accessibility classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-secondary);
  color: white;
  padding: 8px;
  z-index: 1000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* Responsiveness */
@media (max-width: 768px) {
  h1 { font-size: 2.25rem; line-height: 1.3; }
  h2 { font-size: 1.75rem; }
  
  .header-inner { flex-direction: row; justify-content: space-between; align-items: center; flex-wrap: wrap; }
  
  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
}

.features, .how-it-works, .problem {
  background-image: url('assets/background-topo.png');
  background-size: cover;
  background-position: center;
  background-blend-mode: overlay;
}

.how-it-works-timeline {
  position: relative;
  border-left: 3px solid var(--color-neutral);
  padding-left: var(--spacing-5);
  margin-left: var(--spacing-4);
}

.how-it-works-step {
  position: relative;
  margin-bottom: var(--spacing-5);
  background: var(--color-neutral);
  padding: var(--spacing-4);
  border-radius: var(--border-radius);
}

.how-it-works-step:last-child {
  margin-bottom: 0;
}

.how-it-works-number {
  position: absolute;
  left: calc(-1 * var(--spacing-5) - 20px);
  top: var(--spacing-4);
  width: 40px;
  height: 40px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.25rem;
  border: 4px solid var(--color-white);
}

@media (max-width: 768px) {
  .footer-links { flex-direction: column; align-items: center; gap: var(--spacing-3); }
  .footer-links a {
    white-space: nowrap;
  }
}

/* Inner pages padding */
main {
  padding-top: 64px;
}
main#main-content {
  padding-top: 0;
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-primary);
  padding: 8px;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .header-inner {
    flex-direction: row !important;
    flex-wrap: wrap;
  }

  nav[aria-label="Main Navigation"] {
    display: none;
    width: 100%;
    margin-top: var(--spacing-3);
    padding-top: var(--spacing-3);
    border-top: 1px solid #eee;
  }

  body.menu-open nav[aria-label="Main Navigation"] {
    display: block;
  }

  nav[aria-label="Main Navigation"] ul {
    flex-direction: column !important;
    width: 100%;
    gap: var(--spacing-4);
  }

  nav[aria-label="Main Navigation"] ul li {
    width: 100%;
    text-align: center;
  }

  nav[aria-label="Main Navigation"] ul li .btn {
    width: 100%;
  }
}