@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Colors */
  --midnight-navy: #0B1F3A;
  --bone-white: #F4EFE6;
  --signal-cyan: #00B8C4;
  --carbon: #0E0E12;
  --pure-white: #FFFFFF;
  --slate: #3A4150;
  
  /* Gradients */
  --bg-gradient: linear-gradient(135deg, var(--midnight-navy) 0%, var(--carbon) 100%);
  --cyan-glow: 0 0 20px rgba(0, 184, 196, 0.3);

  /* Typography */
  --font-base: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-base);
  color: var(--slate);
  background-color: var(--bone-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-base);
  color: var(--midnight-navy);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}
/* Contrast for dark background logos */
.logo-container img {
  background: var(--pure-white);
  padding: 4px 12px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transition: all var(--transition-fast);
}

.logo-container a:hover img {
  box-shadow: 0 4px 15px rgba(0, 184, 196, 0.4);
  transform: translateY(-1px);
}

.footer-logo img {
  background: var(--pure-white);
  padding: 2px 8px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.footer-logo:hover img {
  box-shadow: 0 4px 10px rgba(0, 184, 196, 0.4);
  transform: translateY(-1px);
}
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: var(--spacing-md); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: var(--spacing-sm); }
p { margin-bottom: var(--spacing-sm); }

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

section {
  padding: var(--spacing-xl) 0;
}

/* Theme Classes */
.bg-dark {
  background: var(--bg-gradient);
  color: var(--bone-white);
}

.bg-dark h1, .bg-dark h2, .bg-dark h3 {
  color: var(--pure-white);
}

.bg-light {
  background-color: var(--pure-white);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  min-height: 48px; /* Mobile touch target */
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--signal-cyan);
  color: var(--midnight-navy);
}

.btn-primary:hover {
  background-color: #009DA8;
  transform: translateY(-2px);
  box-shadow: var(--cyan-glow);
}

.btn-secondary {
  background-color: transparent;
  color: var(--pure-white);
  border-color: var(--pure-white);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(11, 31, 58, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: transform var(--transition-normal);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo-container svg {
  height: 32px;
  fill: var(--pure-white);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  color: var(--bone-white);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  padding: 0.5rem; /* Better touch target */
  display: block;
}

.nav-links a:hover {
  color: var(--signal-cyan);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--pure-white);
  font-size: 1.5rem;
  cursor: pointer;
  min-height: 48px; /* Mobile touch target */
  min-width: 48px;
  align-items: center;
  justify-content: center;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 100px; /* Offset for header */
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-slogan {
  color: var(--signal-cyan);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.9rem;
}

.hero-bajada {
  font-size: 1.25rem;
  color: var(--bone-white);
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
  max-width: 600px;
}

.hero-ctas {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.hero-support-text {
  font-size: 0.85rem;
  color: var(--slate);
  opacity: 0.8;
}

/* Hero Abstract Graphics */
.hero-graphics {
  position: absolute;
  top: 50%;
  right: -10%;
  transform: translateY(-50%);
  width: 60%;
  height: 80%;
  z-index: 1;
  pointer-events: none;
}

/* Cards & Grid */
.grid-3, .grid-4 {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.card {
  background: var(--pure-white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid rgba(11, 31, 58, 0.05);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(11, 31, 58, 0.1);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-sm);
  fill: var(--signal-cyan);
}

/* Dark Cards (for bg-dark sections) */
.bg-dark .card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--bone-white);
}

.bg-dark .card h3 {
  color: var(--pure-white);
}

.bg-dark .card:hover {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  border-color: rgba(0, 184, 196, 0.3);
}

/* System Diagram (Section 7) */
.system-diagram {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.system-column {
  flex: 1;
  background: rgba(255,255,255,0.03);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  text-align: center;
}

.system-column.processing {
  border-color: var(--signal-cyan);
  box-shadow: var(--cyan-glow);
}

.system-column ul {
  list-style: none;
  text-align: left;
  margin-top: var(--spacing-sm);
}

.system-column li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

.system-column li::before {
  content: '→';
  color: var(--signal-cyan);
  margin-right: 0.5rem;
}

/* Timeline (Section 8) */
.timeline {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-top: var(--spacing-lg);
}

.timeline::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 0;
  width: 100%;
  height: 2px;
  background: rgba(11, 31, 58, 0.1);
  z-index: 1;
}

.timeline-step {
  flex: 1;
  position: relative;
  z-index: 2;
  padding: 0 var(--spacing-xs);
  text-align: center;
}

.timeline-number {
  width: 50px;
  height: 50px;
  background: var(--pure-white);
  border: 2px solid var(--midnight-navy);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--midnight-navy);
  margin: 0 auto var(--spacing-sm);
  transition: all var(--transition-normal);
}

.timeline-step:hover .timeline-number {
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  color: var(--midnight-navy);
}

/* Comparison Table (Section 10) */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-md);
  background: var(--pure-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.comparison-table th, .comparison-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid rgba(11, 31, 58, 0.1);
}

.comparison-table th {
  background: var(--midnight-navy);
  color: var(--pure-white);
  font-weight: 600;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table td:nth-child(2) {
  color: var(--slate);
  background: #fafafa;
}

.comparison-table td:nth-child(3) {
  color: var(--midnight-navy);
  font-weight: 500;
  background: rgba(0, 184, 196, 0.05);
}

/* FAQ Accordion */
details {
  background: var(--pure-white);
  border: 1px solid rgba(11, 31, 58, 0.1);
  border-radius: 4px;
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
}

summary {
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: 48px; /* Mobile touch target */
  display: flex;
  align-items: center;
  font-weight: 600;
  color: var(--midnight-navy);
  cursor: pointer;
  list-style: none;
  position: relative;
  outline: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--signal-cyan);
  transition: transform var(--transition-fast);
}

details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

details[open] summary {
  border-bottom: 1px solid rgba(11, 31, 58, 0.1);
}

.faq-content {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--slate);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--pure-white);
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  min-height: 48px; /* Mobile touch target */
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
  color: var(--pure-white);
  border-radius: 4px;
  font-family: var(--font-base);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--signal-cyan);
  box-shadow: 0 0 0 2px rgba(0, 184, 196, 0.2);
}

.form-control::placeholder {
  color: rgba(255,255,255,0.5);
}

/* Select specific styling */
select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23F4EFE6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
  padding-right: 2.5rem;
}

select.form-control option {
  background-color: var(--midnight-navy);
  color: var(--bone-white);
  padding: 10px;
}

/* Footer */
footer {
  background: var(--carbon);
  color: var(--bone-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-logo svg {
  height: 24px;
  fill: var(--pure-white);
  margin-bottom: var(--spacing-sm);
}

.footer-links h4 {
  color: var(--pure-white);
  margin-bottom: var(--spacing-sm);
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(244, 239, 230, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--signal-cyan);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
  color: rgba(244, 239, 230, 0.5);
}

/* Accessibility & Utils */
:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* SVG Motion Graphics */
@keyframes pulse {
  0% { opacity: 0.5; r: 4; }
  50% { opacity: 1; r: 6; box-shadow: 0 0 10px var(--signal-cyan); }
  100% { opacity: 0.5; r: 4; }
}

@keyframes flow {
  0% { stroke-dashoffset: 100; }
  100% { stroke-dashoffset: 0; }
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

.node {
  animation: pulse 3s infinite ease-in-out;
}

.connection {
  stroke-dasharray: 10;
  animation: flow 20s linear infinite;
}

.floating-element {
  animation: float 6s infinite ease-in-out;
}

/* Responsive */
@media (max-width: 992px) {
  .system-diagram {
    flex-direction: column;
  }
  
  .hero-graphics {
    opacity: 0.3;
    right: -20%;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  
  .nav-links {
    display: none; /* Hide for mobile menu toggle */
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: rgba(11, 31, 58, 0.98);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .hero-ctas {
    flex-direction: column;
  }
  
  .timeline {
    flex-direction: column;
  }
  
  .timeline::before {
    left: 24px;
    top: 0;
    width: 2px;
    height: 100%;
  }
  
  .timeline-step {
    display: flex;
    text-align: left;
    margin-bottom: var(--spacing-md);
  }
  
  .timeline-number {
    margin: 0 var(--spacing-sm) 0 0;
    flex-shrink: 0;
  }
  
  /* Make comparison table responsive */
  .comparison-table, .comparison-table tbody, .comparison-table tr, .comparison-table td, .comparison-table th {
    display: block;
  }
  
  .comparison-table tr {
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(11, 31, 58, 0.1);
    border-radius: 8px;
  }
  
  .comparison-table th {
    display: none; /* Hide original headers */
  }
  
  .comparison-table td {
    border-bottom: 1px solid rgba(11, 31, 58, 0.05);
    position: relative;
    padding-left: 50%;
  }
  
  .comparison-table td::before {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 45%;
    font-weight: 600;
    content: attr(data-label);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}