:root {
  --bili-blue: 195 100% 42%;
  --bili-pink: 340 96% 72%;
  --bili-light: 200 100% 95%;
  --bili-dark: 215 25% 27%;
  --background: 0 0% 100%;
  --foreground: 220 14% 4%;
  --card: 0 0% 100%;
  --card-foreground: 220 14% 4%;
  --muted: 210 20% 96%;
  --muted-foreground: 215 16% 47%;
  --border: 214 32% 91%;
  --radius: 1rem;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  transition: background-color 0.3s ease, color 0.3s ease;
}

.font-display { font-family: 'Outfit', 'Inter', sans-serif; }

.bili-blue { color: hsl(var(--bili-blue)); }
.bili-pink { color: hsl(var(--bili-pink)); }
.bili-dark { color: hsl(var(--bili-dark)); }
.bg-bili-blue { background-color: hsl(var(--bili-blue)); }
.bg-bili-pink { background-color: hsl(var(--bili-pink)); }
.bg-bili-light { background-color: hsl(var(--bili-light)); }
.bg-bili-dark { background-color: hsl(var(--bili-dark)); }
.border-bili-blue { border-color: hsl(var(--bili-blue)); }
.border-bili-pink { border-color: hsl(var(--bili-pink)); }

.gradient-text {
  background: linear-gradient(135deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
}

.gradient-text-animated {
  background: linear-gradient(135deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)), #a78bfa, hsl(var(--bili-blue)));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 300% 300%;
  animation: gradient-x 6s ease infinite;
}

.gradient-bg {
  background: linear-gradient(135deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
}

.gradient-bg-animated {
  background: linear-gradient(135deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)), #a78bfa, hsl(var(--bili-blue)));
  background-size: 300% 300%;
  animation: gradient-x 8s ease infinite;
}

.bili-card {
  background: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.bili-card:hover {
  border-color: hsla(var(--bili-blue), 0.3);
  box-shadow: 0 20px 40px -12px hsla(var(--bili-blue), 0.15), 0 0 0 1px hsla(var(--bili-blue), 0.05);
  transform: translateY(-4px);
}

/* Glassmorphism header */
.glass-header {
  background: hsla(var(--background), 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid hsla(var(--bili-blue), 0.08);
}

/* Scroll progress bar */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
  z-index: 100;
  width: 0%;
  transition: width 0.1s linear;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger children */
.stagger-children > *:nth-child(1) { transition-delay: 0s; }
.stagger-children > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children > *:nth-child(3) { transition-delay: 0.2s; }
.stagger-children > *:nth-child(4) { transition-delay: 0.3s; }
.stagger-children > *:nth-child(5) { transition-delay: 0.4s; }
.stagger-children > *:nth-child(6) { transition-delay: 0.5s; }

/* Floating blobs */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: hsl(var(--muted)); }
::-webkit-scrollbar-thumb { background: hsla(var(--bili-blue), 0.3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: hsla(var(--bili-blue), 0.5); }

/* Button glow */
.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: linear-gradient(135deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
  filter: blur(12px);
}

.btn-glow:hover::before { opacity: 0.6; }

/* Section divider */
.section-divider {
  height: 120px;
  overflow: hidden;
  position: relative;
}

.section-divider svg {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100%;
}

/* Back to top */
#back-to-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Mobile menu */
#mobile-menu {
  transform-origin: top;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Image hover zoom */
.img-zoom {
  overflow: hidden;
}

.img-zoom img {
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.img-zoom:hover img {
  transform: scale(1.05);
}

/* Timeline line (legacy, kept for backwards compat) */
.timeline-line::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
  transform: translateX(-50%);
}

@media (max-width: 768px) {
  .timeline-line::before { display: none; }
}

/* Nav link underline effect */
.nav-link-effect {
  position: relative;
}

.nav-link-effect::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateX(-50%);
  border-radius: 2px;
}

.nav-link-effect:hover::after,
.nav-link-effect.active::after {
  width: 80%;
}

/* Card shine effect */
.card-shine {
  position: relative;
  overflow: hidden;
}

.card-shine::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(255,255,255,0.1) 50%,
    transparent 100%
  );
  transform: rotate(30deg) translateX(-100%);
  transition: transform 0.6s ease;
}

.card-shine:hover::after {
  transform: rotate(30deg) translateX(100%);
}

/* Number counter style */
.counter-number {
  font-variant-numeric: tabular-nums;
}

/* Focus visible */
*:focus-visible {
  outline: 2px solid hsl(var(--bili-blue));
  outline-offset: 2px;
}

/* Phosphor Icons sizing fix */
.ph-duotone {
  line-height: 1;
  vertical-align: middle;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Map Tailwind width classes to font-size for Phosphor webfont icons */
.ph-duotone.w-3,
.ph-duotone.h-3 { font-size: 0.75rem; }
.ph-duotone.w-4,
.ph-duotone.h-4 { font-size: 1rem; }
.ph-duotone.w-5,
.ph-duotone.h-5 { font-size: 1.25rem; }
.ph-duotone.w-6,
.ph-duotone.h-6 { font-size: 1.5rem; }
.ph-duotone.w-7,
.ph-duotone.h-7 { font-size: 1.75rem; }
.ph-duotone.w-8,
.ph-duotone.h-8 { font-size: 2rem; }

.international-card .card-icon i.ph-duotone,
.version-card .card-icon i.ph-duotone {
  font-size: 1.75rem;
}

/* Feature cards icon containers (w-12/w-14) */
div.w-12.h-12 > i.ph-duotone,
div.w-14.h-14 > i.ph-duotone {
  font-size: 1.75rem;
}

.international-cta-card .check-circle i.ph-duotone {
  font-size: 1rem;
}

/* ===== INTERNACIONAL SECTION ENHANCEMENTS ===== */

.international-section {
  position: relative;
}

.international-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, hsla(var(--bili-blue), 0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, hsla(var(--bili-pink), 0.04) 0%, transparent 50%);
  pointer-events: none;
}

.international-card {
  background: linear-gradient(145deg, hsl(var(--card)), #f8fafc);
  border: 1px solid hsla(var(--bili-blue), 0.08);
  border-radius: 1.5rem;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.international-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, hsl(var(--bili-blue)), hsl(var(--bili-pink)));
  opacity: 0;
  transition: opacity 0.4s ease;
}

.international-card:hover {
  transform: translateY(-6px);
  border-color: hsla(var(--bili-blue), 0.2);
  box-shadow: 
    0 24px 48px -12px hsla(var(--bili-blue), 0.12),
    0 0 0 1px hsla(var(--bili-blue), 0.05);
}

.international-card:hover::before {
  opacity: 1;
}

.international-card .card-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
}

.international-card .card-icon::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  background: inherit;
  opacity: 0.3;
  filter: blur(12px);
  z-index: -1;
}

.international-feature-list .feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1rem;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
}

.international-feature-list .feature-item:hover {
  background: hsla(var(--bili-blue), 0.04);
}

.international-feature-list .feature-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
}

.international-feature-list .feature-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: inherit;
  opacity: 0.3;
  filter: blur(4px);
}

.international-cta-card {
  background: linear-gradient(135deg, hsl(var(--bili-blue)), #0088cc, hsl(var(--bili-blue)));
  background-size: 200% 200%;
  animation: gradient-x 8s ease infinite;
  border-radius: 2rem;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: 
    0 32px 64px -16px hsla(var(--bili-blue), 0.35),
    0 0 0 1px hsla(0, 0%, 100%, 0.1) inset;
}

.international-cta-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.1) 0%, transparent 40%),
    radial-gradient(circle at 70% 80%, rgba(255,255,255,0.08) 0%, transparent 40%);
  pointer-events: none;
}

.international-cta-card .cta-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image: 
    radial-gradient(circle at 1px 1px, white 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
}

.international-cta-card .check-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.5rem 0;
}

.international-cta-card .check-circle {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.2);
  transition: all 0.3s ease;
}

.international-cta-card:hover .check-circle {
  background: rgba(255,255,255,0.25);
  transform: scale(1.1);
}

.international-cta-card .cta-button {
  background: white;
  color: hsl(var(--bili-blue));
  font-weight: 700;
  padding: 1rem 2rem;
  border-radius: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  position: relative;
  overflow: hidden;
}

.international-cta-card .cta-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsla(var(--bili-blue), 0.1), hsla(var(--bili-pink), 0.1));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.international-cta-card .cta-button:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 16px 40px rgba(0,0,0,0.18);
}

.international-cta-card .cta-button:hover::before {
  opacity: 1;
}

.international-tip-card {
  background: linear-gradient(145deg, hsl(var(--card)), #f0fdf4);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: 1.5rem;
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: all 0.4s ease;
}

.international-tip-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, #22c55e, #16a34a);
  border-radius: 2px;
}

.international-tip-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px -8px rgba(34, 197, 94, 0.15);
}

.version-compare-section {
  background: linear-gradient(135deg, #0f172a, #1e3a5f, #0f172a);
  background-size: 200% 200%;
  animation: gradient-x 12s ease infinite;
  border-radius: 2rem;
  padding: 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 32px 64px -16px rgba(15, 23, 42, 0.4);
}

.version-compare-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(0, 161, 214, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(251, 114, 153, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.version-compare-section .cta-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: 
    radial-gradient(circle at 1px 1px, white 1px, transparent 0);
  background-size: 32px 32px;
  pointer-events: none;
}

.version-card {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1.5rem;
  padding: 2rem;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.version-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
}

.version-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-6px);
  box-shadow: 0 24px 48px -12px rgba(0,0,0,0.3);
}

.version-card .version-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.version-card .version-feature {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0;
}

.version-card .version-feature i {
  flex-shrink: 0;
}

.recommended-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #1f2937;
  font-size: 0.625rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  box-shadow: 0 4px 12px rgba(251, 191, 36, 0.3);
  z-index: 10;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, .reveal-left, .reveal-right, .reveal-scale {
    opacity: 1;
    transform: none;
  }
}