html, body {
  scroll-behavior: smooth;
}

/* Landing page cards */
.landing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.landing-card {
  text-align: left;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
  padding: 0;
}
.landing-card:hover {
  transform: translateY(-6px);
  border-color: #bfdbfe;
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
}
.landing-card-media {
  background: radial-gradient(circle at top, #eff6ff 0%, #ffffff 70%);
  padding: 18px 18px 8px 18px;
}
.landing-card-media img {
  width: 100%;
  height: 200px;
  object-fit: contain;
  display: block;
}
.landing-card-body {
  padding: 0 18px 12px 18px;
}
.landing-card-body h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 6px;
}
.landing-card-body p {
  color: #475569;
  font-size: 0.95rem;
  line-height: 1.4;
}
.landing-card-cta {
  padding: 12px 18px 18px 18px;
  font-weight: 600;
  color: #2563eb;
}

/* HHHL host support cards */
.host-os-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 620px;
}

.host-os-card {
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  background: #ffffff;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  text-align: left;
}

.host-os-icon {
  width: 32px;
  height: 32px;
  margin: 0;
  object-fit: contain;
  display: block;
  flex: 0 0 32px;
}

.ubuntu-color {
  filter: invert(38%) sepia(82%) saturate(2055%) hue-rotate(350deg) brightness(96%) contrast(96%);
}

.windows-color {
  filter: invert(34%) sepia(98%) saturate(2384%) hue-rotate(190deg) brightness(98%) contrast(101%);
}

.host-os-text {
  text-align: left;
}

.host-os-text h3,
.host-os-text p {
  margin: 0;
}

.host-os-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
}

.host-os-card p {
  margin-top: 2px;
  color: #475569;
  font-size: 0.9rem;
}

.host-label {
  display: flex;
  align-items: center;
  gap: 6px;
}

.host-label-icon {
  width: 14px;
  height: 14px;
  object-fit: contain;
  display: inline-block;
}

/* Active navigation */
.nav-btn.active {
  font-weight: 600;
  color: #1d4ed8;
  background-color: #dbeafe;
}

/* Section fade-in animation */
.content-section {
  animation: fadeIn 0.4s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hotspots */
.hotspot {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #2563eb;
  color: white;
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 0 8px rgba(0,0,0,0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  z-index: 10;
}
.hotspot:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px rgba(37,99,235,0.4);
}

/* Tooltip styling */
.hotspot-tooltip {
  position: absolute;
  min-width: 200px;
  background: white;
  border-radius: 8px;
  padding: 10px 14px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.25);
  font-size: 14px;
  z-index: 1000;
  opacity: 0;
  transform: translateY(5px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.hotspot-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}
.hotspot-tooltip h4 {
  font-weight: 600;
  color: #1e3a8a;
  margin-bottom: 4px;
}
.hotspot-desc {
  color: #374151;
  font-weight: 400;
  line-height: 1.4;
}

/* Accordion styling */
.accordion-item + .accordion-item {
  margin-top: 8px;
}
.accordion-header .accordion-icon {
  transition: transform 0.3s ease;
}
.accordion-header.active .accordion-icon {
  transform: rotate(45deg);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  body {
    padding-top: 3.5rem; /* space for the menu button */
  }

  main {
    padding: 1.5rem;
  }

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

  .landing-card-media img {
    height: 180px;
  }

  .host-os-grid {
    max-width: 100%;
  }

  .hotspot {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }

  .content-section h1 {
    font-size: 1.75rem;
  }

  .content-section p {
    font-size: 0.95rem;
  }

  .next-btn {
    width: 100%;
    justify-content: center;
  }
}