/* Kortega AI — Public Landing Stylesheet */

:root {
  --bg-dark: #090d16;
  --bg-card: #131c2e;
  --bg-card-hover: #1a263d;
  --border-color: rgba(255, 255, 255, 0.1);
  --border-highlight: rgba(0, 210, 255, 0.3);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #00d2ff;
  --accent-blue: #3a7bd5;
  --accent-gradient: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
  --focus-ring: #00d2ff;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-glow: 0 0 25px rgba(0, 210, 255, 0.15);
  --max-width: 1100px;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
  font-family: var(--font-stack);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow-x: hidden;
}

/* Background subtlety */
body::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(0, 210, 255, 0.08) 0%, rgba(9, 13, 22, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

header, main, footer {
  position: relative;
  z-index: 1;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  padding: 2rem 0 1rem;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
}

.badge-tag {
  background: rgba(0, 210, 255, 0.1);
  border: 1px solid var(--border-highlight);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Section */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.hero-content {
  max-width: 760px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 2.5rem;
}

/* CTA Component */
.cta-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: var(--accent-gradient);
  color: #ffffff;
  font-weight: 600;
  font-size: 1.1rem;
  padding: 0.9rem 2.25rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: var(--shadow-glow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(0, 210, 255, 0.3);
}

.btn-primary:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 4px;
}

.btn-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
  transition: transform 0.2s ease;
}

.btn-primary:hover .btn-icon {
  transform: translateX(3px);
}

.cta-notice {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cta-notice::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
}

/* Pillars Section */
.features {
  padding: 3rem 0 5rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--border-highlight);
  background-color: var(--bg-card-hover);
  transform: translateY(-3px);
}

.card-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(0, 210, 255, 0.08);
  border: 1px solid rgba(0, 210, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent-cyan);
}

.card-icon-box svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Roadmap Specializations Card */
.card-wide {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(19, 28, 46, 0.9) 0%, rgba(26, 38, 61, 0.9) 100%);
  border: 1px solid rgba(0, 210, 255, 0.25);
}

.specializations-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.spec-badge {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: auto;
  background-color: rgba(9, 13, 22, 0.8);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .hero {
    padding: 2.5rem 0 2rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .btn-primary {
    width: 100%;
  }
}