:root {
  --yl-navy: #0f172a;
  --yl-navy-soft: #1e293b;
  --yl-accent: #6366f1;
  --yl-accent-hover: #4f46e5;
  --yl-surface: #f1f5f9;
  --yl-font-sans: "DM Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --yl-font-display: "Outfit", var(--yl-font-sans);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--yl-font-sans);
  color: var(--yl-navy);
  background: #fff;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1020;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.navbar-brand {
  font-family: var(--yl-font-display);
  font-weight: 600;
  color: var(--yl-navy) !important;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  background: linear-gradient(135deg, #a855f7, var(--yl-accent));
  box-shadow: 0 4px 14px rgba(168, 85, 247, 0.35);
}

.brand-mark--sm {
  width: 1.5rem;
  height: 1.5rem;
}

.navbar .nav-link {
  color: var(--yl-navy-soft);
  font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.active {
  color: var(--yl-accent);
}

.btn-primary {
  --bs-btn-bg: var(--yl-accent);
  --bs-btn-border-color: var(--yl-accent);
  --bs-btn-hover-bg: var(--yl-accent-hover);
  --bs-btn-hover-border-color: var(--yl-accent-hover);
}

.detail-liang {
  background: linear-gradient(135deg, #4c1d95 0%, #312e81 50%, var(--yl-navy) 100%);
  position: relative;
  overflow: hidden;
}

.detail-liang::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 10% 30%, rgba(192, 132, 252, 0.25), transparent 50%);
  pointer-events: none;
}

.py-lg-6 {
  padding-top: 4.5rem !important;
  padding-bottom: 4.5rem !important;
}

.device-frame {
  max-width: 22rem;
  position: relative;
}

.device-frame::after {
  content: "";
  position: absolute;
  inset: -8%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 65%);
  z-index: -1;
}

.section-muted {
  background: var(--yl-surface);
}

.section-title {
  font-family: var(--yl-font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-cta {
  background: linear-gradient(120deg, #5b21b6, #1e3a8a);
}

.cta-prose {
  max-width: 28rem;
}

.shot-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.shot-item {
  width: 100%;
}

.shot-item img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

@media (max-width: 991.98px) {
  .shot-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 575.98px) {
  .shot-strip {
    grid-template-columns: 1fr;
  }
}

.site-footer {
  background: #fff;
}

.skip-link:focus {
  z-index: 2000;
}

.navbar-toggler {
  padding: 0.35rem 0.55rem;
}