:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-text: #1a202c;
  --color-text-muted: #4a5568;
  --color-accent: #0f172a;
  --color-accent-light: #e2e8f0;
  --color-border: #edf2f7;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --spacing-xxl: 6rem;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

p {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  max-width: 65ch;
  margin-bottom: var(--spacing-md);
}

a {
  color: #2563eb;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  text-decoration: underline;
  color: #1d4ed8;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

section:nth-child(even) {
  background-color: var(--color-bg-alt);
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  padding: var(--spacing-md) 0;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav.desktop-nav {
  display: flex;
  gap: var(--spacing-lg);
}

nav.desktop-nav a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav.desktop-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.mobile-menu-toggle {
  display: none;
}

.mobile-nav {
  display: none;
}

/* Overview Section */
.hero {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-text h1 {
  font-size: 3.25rem;
  line-height: 1.1;
  color: var(--color-accent);
}

.hero-text .subtitle {
  font-size: 1.25rem;
  font-weight: 400;
  margin-bottom: var(--spacing-lg);
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: #124a75;
  color: white;
  border: 1px solid #124a75;
}

.btn-primary:hover {
  background-color: #0f3e61;
  color: white;
  text-decoration: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid #cbd5e1;
}

.btn-secondary:hover {
  background-color: var(--color-bg-alt);
  border-color: var(--color-text-muted);
  text-decoration: none;
}

.key-characteristics {
  background-color: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.key-characteristics ul {
  list-style: none;
}

.key-characteristics li {
  display: flex;
  align-items: flex-start;
  text-align: left;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-accent);
}

.key-characteristics li::before {
  content: "—";
  color: #2563eb;
  font-weight: bold;
}

.hero-image {
  border-radius: 12px;
  overflow: hidden;
  background-color: transparent;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* Metric Block */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.metric-card {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: var(--spacing-sm);
}

.metric-label {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Two Column Layouts */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.feature-block {
  margin-bottom: var(--spacing-xl);
}

.feature-block h3 {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent-light);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.feature-image img {
  width: 100%;
  border-radius: 8px;
  display: block;
}

.feature-image.fade-right img {
  -webkit-mask-image: linear-gradient(to right, black 60%, transparent 100%);
  mask-image: linear-gradient(to right, black 60%, transparent 100%);
}

.feature-image.fade-left img {
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 40%);
  mask-image: linear-gradient(to right, transparent 0%, black 40%);
}

.feature-image.fade-bottom img {
  -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}

.feature-image-stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  justify-content: center;
  align-items: stretch;
}

.feature-image-stack .feature-image {
  width: 100%;
}

/* Lists */
.bullet-list {
  list-style-type: none;
}

.bullet-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-muted);
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #2563eb;
}

/* Grid Layout for Tech */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.card {
  background: white;
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
}

.card h3 {
  font-size: 1.25rem;
}

.card p {
  margin-bottom: 0;
  font-size: 1rem;
}

/* Vision Section */
.vision-box {
  text-align: center;
  padding: var(--spacing-xl);
  background-color: var(--color-accent);
  color: white;
  border-radius: 12px;
}

.vision-box h2 {
  color: white;
}

.vision-box p {
  color: #cbd5e1;
  margin: 0 auto;
  max-width: 800px;
  font-size: 1.25rem;
}

/* FAQ Section */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.faq-item {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.faq-item:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.faq-item summary {
  padding: 1.25rem var(--spacing-lg);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  list-style: none; /* Hide default triangle */
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none; /* Hide default triangle for WebKit */
}

/* Custom animated plus/minus icon using pseudo-elements */
.faq-item summary::after {
  content: "+";
  font-size: 1.5rem;
  color: #2563eb;
  transition: transform 0.3s ease;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 var(--spacing-lg) 1.25rem var(--spacing-lg);
}

.faq-content p {
  margin: 0;
  max-width: 100%;
}

/* Footer */
footer {
  background-color: var(--color-bg-alt);
  padding: var(--spacing-xxl) 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.footer-info p {
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.footer-info strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--color-accent);
}

.footer-contact {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}

.footer-contact a.email-link {
  color: var(--color-text-muted);
}

.footer-contact a.email-link:hover {
  text-decoration: underline;
  color: var(--color-accent);
}

.social-links a {
  color: var(--color-text-muted);
  transition: color 0.2s;
  display: inline-flex;
  margin-top: 0.25rem;
}

.social-links a:hover {
  color: #0077b5; /* LinkedIn Brand Blue */
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    background: linear-gradient(rgba(255, 255, 255, 0.93), rgba(255, 255, 255, 0.93)), url('assets/images/heatmap2.webp');
    background-size: cover;
    background-position: center;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 2.25rem;
  }

  .hero-text .subtitle {
    font-size: 1.125rem;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 300px;
  }

  .hero-image {
    display: none;
  }
  
  .two-column {
    grid-template-columns: 1fr;
  }
  
  nav.desktop-nav {
    display: none !important;
  }
  
  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1000;
  }

  .mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-accent);
    transition: all 0.3s ease;
  }
  
  .mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .mobile-nav {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 999;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    padding-top: 5rem;
  }
  
  .mobile-nav.open {
    transform: translateX(0);
  }

  .mobile-nav-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .mobile-nav-inner a {
    font-size: 1.5rem;
    color: var(--color-accent);
    font-weight: 500;
    text-decoration: none;
  }
  
  h1 { font-size: 2.25rem; }
  h2 { font-size: 2rem; }
}

/* Modals & Forms */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background-color: var(--color-bg);
  padding: var(--spacing-xl);
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  position: relative;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  animation: modalIn 0.3s ease cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
  from { transform: scale(0.95) translateY(10px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.close-modal {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: var(--color-text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.close-modal:hover {
  color: var(--color-accent);
}

.modal-content h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 400;
  cursor: pointer;
  color: var(--color-text);
}

.checkbox-group input[type="checkbox"] {
  cursor: pointer;
}