@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700;800&display=swap');

/* DESIGN SYSTEM VARIABLES */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  
  --primary: #4f46e5;       /* Indigo-600 */
  --primary-hover: #4338ca; /* Indigo-700 */
  --primary-light: #e0e7ff; /* Indigo-100 */
  --primary-dark: #312e81;  /* Indigo-900 */
  
  --accent: #2563eb;        /* Royal Blue */
  --accent-light: #dbeafe;  /* Blue-100 */
  
  --success: #10b981;       /* Emerald-500 */
  --success-hover: #059669; /* Emerald-600 */
  --success-light: #d1fae5; /* Emerald-100 */
  
  --danger: #ef4444;        /* Rose-500 */
  --danger-light: #fee2e2;  /* Rose-100 */
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
  
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-xl: 2rem;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

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

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--bg-primary);
  box-shadow: 0 4px 14px 0 rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(79, 70, 229, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary:active {
  transform: translateY(0);
}

/* BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  gap: 0.375rem;
}

.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* NAVBAR */
.navbar {
  position: sticky;
  top: 0;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: var(--transition-normal);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.nav-brand img {
  height: 2.25rem;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* HERO SECTION */
.hero {
  padding: 6rem 0 5rem 0;
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(224, 231, 255, 0.4) 0%, rgba(255, 255, 255, 0) 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-tagline {
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  width: 100%;
}

.hero-mockup {
  position: relative;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transition: var(--transition-normal);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
}

.hero-mockup:hover {
  transform: translateY(-5px) scale(1.01);
  box-shadow: 0 30px 40px -15px rgba(15, 23, 42, 0.15);
}

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

/* METRICS STRIP */
.metrics-strip {
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  padding: 2rem 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.metric-card h3 {
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.metric-card p {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

/* SECTION HEADER */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 4rem auto;
}

.section-header .badge {
  margin-bottom: 1rem;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* FEATURES SECTION */
.features {
  padding: 6rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.feature-icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  margin-bottom: 1.75rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  flex-grow: 1;
}

/* PARADIGM SHIFT SECTION */
.paradigm-section {
  padding: 6rem 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.paradigm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.paradigm-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
}

.paradigm-card.new-way {
  border: 2px solid var(--primary-light);
  box-shadow: var(--shadow-lg);
  background-color: var(--bg-primary);
}

.paradigm-card h3 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.paradigm-card .card-subtitle {
  font-size: 0.95rem;
  color: var(--text-tertiary);
  margin-bottom: 2rem;
  font-weight: 500;
}

.paradigm-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.paradigm-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.paradigm-item svg {
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.paradigm-item h4 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.paradigm-item p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* FAQ SECTION */
.faq-section {
  padding: 6rem 0;
  background-color: var(--bg-secondary);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Styled details and summary accordion */
details.faq-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  overflow: hidden;
}

details.faq-item[open] {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

summary.faq-question {
  padding: 1.5rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none; /* Hide default arrow */
  display: flex;
  justify-content: space-between;
  align-items: center;
  outline: none;
  user-select: none;
}

summary.faq-question::-webkit-details-marker {
  display: none; /* Hide Safari arrow */
}

summary.faq-question::after {
  content: '';
  display: block;
  width: 1.25rem;
  height: 1.25rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' stroke='%234f46e5' stroke-width='2.5' viewBox='0 0 24 24'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  transition: transform 0.25s ease;
}

details.faq-item[open] summary.faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.5rem 1.5rem 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-top: 1px solid var(--bg-tertiary);
  padding-top: 1.25rem;
}

/* HOW IT WORKS SECTION */
.architecture {
  padding: 6rem 0;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.arch-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.arch-diagram {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 900px;
  margin: 3rem 0;
  position: relative;
  flex-wrap: wrap;
  gap: 2rem;
}

.arch-node {
  background-color: var(--bg-primary);
  border: 2px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  width: 180px;
  text-align: center;
  position: relative;
  z-index: 10;
  transition: var(--transition-normal);
}

.arch-node:hover {
  transform: scale(1.05);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.arch-node.core {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.arch-node.core h4 {
  color: var(--primary-dark);
}

.arch-node h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.arch-node p {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.arch-arrow {
  flex-grow: 1;
  height: 2px;
  background-color: var(--border-color);
  position: relative;
  max-width: 80px;
  min-width: 20px;
}

.arch-arrow::after {
  content: '';
  position: absolute;
  right: -2px;
  top: -4px;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid var(--border-color);
}

.arch-grid-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  width: 100%;
  max-width: 900px;
  margin-top: 2rem;
}

.arch-detail-card h3 {
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.arch-detail-card p {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* LICENSING / PRICING SECTION */
.licensing {
  padding: 6rem 0;
  background-color: var(--bg-primary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition-normal);
}

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

.pricing-card.commercial {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.pricing-card.commercial::before {
  content: 'RECOMMENDED FOR OPERATORS';
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background-color: var(--primary);
  color: var(--bg-primary);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
}

.pricing-header h3 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.pricing-header p {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.price {
  font-family: 'Outfit', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-tertiary);
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
}

.pricing-features li svg {
  color: var(--success);
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

/* FOOTER */
.footer {
  background-color: var(--text-primary);
  color: var(--bg-tertiary);
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-about {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-about .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--bg-primary);
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
}

.footer-about .brand img {
  height: 2.25rem;
  filter: brightness(0) invert(1);
}

.footer-about p {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  max-width: 320px;
}

.footer-links h4 {
  color: var(--bg-primary);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--bg-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

/* RESPONSIVE DESIGN */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-content {
    align-items: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .paradigm-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .arch-diagram {
    justify-content: center;
  }
  
  .arch-arrow {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-secondary {
    display: none;
  }
  
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
  }
  
  .arch-grid-details {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}