/* ==========================================================================
   BDIMEXPORT.COM — /zh 展会专属高定着陆页样式系统
   Design Tokens v2.1 (/zh Red-Gold Variant on Corporate Navy)
   ========================================================================== */

:root {
  /* Core Tokens from design-tokens.md */
  --c-primary: #1A2B4A;
  --c-primary-deep: #0B1528;
  --c-primary-mid: #13223C;
  --c-accent: #B91C1C;         /* Chinese Red — used on light surfaces */
  --c-accent-Soft: #FEE2E2;
  --c-highlight: #D4A017;      /* Imperial Gold — Primary CTA & dark surface accent */
  --c-highlight-bright: #F5C43F;
  --c-bg: #FAF8F5;             /* Warm ivory background */
  --c-surface: #FFFFFF;
  --c-border: #E5E1DA;
  --c-border-strong: #8A8478;
  --c-ink: #1F2937;
  --c-muted: #6B7280;
  --c-on-dark: #FAF8F5;
  --c-on-dark-muted: rgba(250, 248, 245, 0.80);
  --c-success: #2E7D32;
  --c-wechat: #07C160;

  --font-zh: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-zh);
  background-color: var(--c-bg);
  color: var(--c-ink);
  overflow-x: hidden;
}

body {
  background-color: var(--c-bg);
  color: var(--c-ink);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Top Scroll Progress Bar */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--c-accent), var(--c-highlight), var(--c-highlight-bright));
  z-index: 9999;
  transition: width 0.08s linear;
  box-shadow: 0 0 12px rgba(212, 160, 23, 0.6);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--c-primary-deep);
}
::-webkit-scrollbar-thumb {
  background: var(--c-highlight);
  border-radius: 4px;
}

/* Scroll Reveal Animations */
.reveal-up {
  opacity: 0;
  transform: translateY(44px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
  will-change: opacity, transform;
}

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

.reveal-scale {
  opacity: 0;
  transform: scale(0.92) translateY(28px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
  will-change: opacity, transform;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-48px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
}

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

.reveal-right {
  opacity: 0;
  transform: translateX(48px);
  transition: opacity 0.85s var(--ease-out-expo), transform 0.85s var(--ease-out-expo);
}

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

/* Stagger delays */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* Hero Silk-Road Background Aura */
.hero-dark-bg {
  background: radial-gradient(circle at 50% 0%, #243B67 0%, var(--c-primary) 45%, var(--c-primary-deep) 100%);
  position: relative;
  overflow: hidden;
}

.hero-grid-overlay {
  background-image: 
    linear-gradient(rgba(212, 160, 23, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 160, 23, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 40%, transparent 100%);
}

/* Primary CTA Button (Gold Fill + Primary Navy Text per K7 rule) */
.btn-gold-primary {
  background: linear-gradient(135deg, #F5C43F 0%, var(--c-highlight) 100%);
  color: var(--c-primary-deep);
  font-weight: 700;
  border-radius: 8px;
  padding: 15px 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: transform 0.25s var(--ease-spring), box-shadow 0.25s ease;
  box-shadow: 0 8px 24px -4px rgba(212, 160, 23, 0.45);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-gold-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px -4px rgba(212, 160, 23, 0.65);
}

.btn-wechat-outline {
  background: rgba(255, 255, 255, 0.06);
  color: var(--c-on-dark);
  border: 1.5px solid rgba(212, 160, 23, 0.55);
  border-radius: 8px;
  padding: 14px 28px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  backdrop-filter: blur(8px);
  transition: all 0.25s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-wechat-outline:hover {
  background: rgba(212, 160, 23, 0.14);
  border-color: var(--c-highlight-bright);
  transform: translateY(-2px);
}

/* Remotion Player Container Styling */
.remotion-player-shell {
  background: #080E1A;
  border: 1px solid rgba(212, 160, 23, 0.32);
  border-radius: 16px;
  box-shadow: 0 28px 70px -12px rgba(8, 14, 26, 0.75), 0 0 0 1px rgba(255, 255, 255, 0.05);
  overflow: hidden;
  position: relative;
}

.remotion-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  min-height: 380px;
  background: radial-gradient(circle at 75% 20%, #1B2E52 0%, #0B1426 60%, #060B14 100%);
  overflow: hidden;
  user-select: none;
}

@media (max-width: 768px) {
  .remotion-viewport {
    aspect-ratio: auto;
    min-height: 460px;
  }
}

/* Service Spotlight Cards */
.service-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  padding: 32px;
  position: relative;
  transition: transform 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo), border-color 0.35s ease;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-highlight));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px -15px rgba(26, 43, 74, 0.14);
  border-color: rgba(185, 28, 28, 0.35);
}

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

.service-card.featured-pillar {
  border: 1.5px solid rgba(185, 28, 28, 0.25);
  background: linear-gradient(180deg, #FFFFFF 0%, #FFFDF9 100%);
}

.service-card.featured-pillar::before {
  opacity: 1;
}

/* Scroll Timeline Progress Line */
.timeline-track {
  position: absolute;
  left: 23px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: var(--c-border);
  border-radius: 3px;
  overflow: hidden;
}

.timeline-fill {
  width: 100%;
  height: 0%;
  background: linear-gradient(180deg, var(--c-accent), var(--c-highlight));
  transition: height 0.15s ease-out;
}

/* Floating WeChat Action Button */
.floating-wechat-btn {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  background: linear-gradient(135deg, #07C160 0%, #059649 100%);
  color: #FFFFFF;
  border-radius: 999px;
  padding: 12px 22px;
  font-weight: 600;
  box-shadow: 0 10px 28px -4px rgba(7, 193, 96, 0.55);
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  border: 2px solid rgba(255, 255, 255, 0.25);
  transition: transform 0.25s var(--ease-spring), box-shadow 0.25s ease;
}

.floating-wechat-btn:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 14px 34px -4px rgba(7, 193, 96, 0.7);
}

/* Pulse Ring Animation */
@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(212, 160, 23, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 12px rgba(212, 160, 23, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(212, 160, 23, 0); }
}

.pulse-gold {
  animation: pulse-ring 2.4s infinite;
}

/* Modal Backdrop */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 21, 40, 0.82);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--c-surface);
  border-radius: 20px;
  max-width: 440px;
  width: 100%;
  padding: 32px;
  transform: translateY(24px) scale(0.95);
  transition: transform 0.35s var(--ease-spring);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.5);
  border-top: 5px solid var(--c-accent);
}

.modal-backdrop.active .modal-card {
  transform: translateY(0) scale(1);
}