/* 系统字体栈 - 不依赖外部字体 */
body {
  font-family: 
    -apple-system, 
    BlinkMacSystemFont, 
    "PingFang SC", 
    "Microsoft YaHei", 
    "Helvetica Neue", 
    Arial, 
    sans-serif !important;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 
    -apple-system, 
    BlinkMacSystemFont, 
    "Songti SC", 
    "SimSun", 
    "STSong", 
    serif !important;
}
/* ========================================
   深圳市莱特生物科技有限公司·京图瑞景 — 官网样式
   Design System: Bright Lab (洁净实验室风格)
   ======================================== */

/* ——— CSS Custom Properties ——— */
:root {
  /* ===== Color System (Logo Blue #1223a8) ===== */
  --color-primary: #1223a8;
  --color-primary-light: #1e3bd4;
  --color-primary-mid: #162cc0;
  --color-primary-dark: #0a1460;

  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-accent-dark: #1d4ed8;
  --color-accent-glow: rgba(37, 99, 235, 0.25);

  --color-gold: #2563eb;
  --color-gold-light: #60a5fa;
  --color-gold-dark: #1d4ed8;

  --color-surface: #ffffff;
  --color-surface-warm: #f8faff;
  --color-bg: #eff3ff;
  --color-bg-alt: #e4ebf8;
  --color-bg-gradient: linear-gradient(180deg, #eff3ff 0%, #e4ebf8 100%);

  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-border-accent: rgba(37, 99, 235, 0.2);

  /* ===== Typography ===== */
  --font-heading: 'Noto Serif SC', 'DM Serif Display', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* ===== Spacing (Refined) ===== */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 0.875rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3.5vw, 3.5rem);
  --space-xl: clamp(2.5rem, 5vw, 5.5rem);
  --space-2xl: clamp(4rem, 8vw, 9rem);

  /* ===== Layout ===== */
  --max-width: 1400px;
  --content-width: 1200px;
  --nav-height: 76px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --radius-full: 9999px;

  /* ===== Shadow System (Premium Depth) ===== */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.1), 0 8px 24px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.12);
  --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.04);

  /* ===== Transition System ===== */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 180ms;
  --duration-normal: 350ms;
  --duration-slow: 600ms;
  --duration-slower: 900ms;
}

/* ——— Reset & Base ——— */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.95rem + 0.15vw, 1.125rem);
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* Subtle texture overlay for premium feel */
  background-image:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(37, 99, 235, 0.03), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(201, 169, 110, 0.02), transparent);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-primary);
}

/* ——— Accessibility ——— */
.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: 10000;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: top var(--duration-fast);
}

.skip-link:focus {
  top: 16px;
  box-shadow: var(--shadow-md);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ——— Utility Classes ——— */
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-header.center {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-xl);
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  padding: 4px 12px;
  border-radius: 100px;
  background: oklch(0.58 0.14 195 / 0.1);
}

.section-tag.light {
  color: var(--color-accent-dark);
  background: rgba(37, 99, 235, 0.1);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section-title.light {
  color: var(--color-primary);
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: clamp(0.95rem, 1.1vw, 1.1rem);
  max-width: 640px;
}

.hide-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hide-mobile {
    display: inline;
  }
}

/* ——— Buttons ——— */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 100px;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-outline {
  color: var(--color-primary);
  border: 1.5px solid rgba(26, 54, 93, 0.25);
}

.btn-outline:hover {
  background: rgba(26, 54, 93, 0.06);
  border-color: rgba(26, 54, 93, 0.4);
}

/* ——— Navigation (Premium) ——— */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--duration-normal), box-shadow var(--duration-normal), border-color var(--duration-normal);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  z-index: 1001;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-primary);
  transition: opacity var(--duration-fast);
}

.brand-link:hover {
  opacity: 0.85;
}

.brand-logo {
  display: flex;
  align-items: center;
  color: var(--color-accent);
  transition: color var(--duration-normal);
}

.brand-logo-img {
  display: block;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}

.brand-logo-img:hover {
  transform: scale(1.05);
  transition: transform var(--duration-fast) var(--ease-out-back);
}

/* Full logo (icon + text) in navbar */
.brand-logo-full {
  border-radius: 0;
  height: 140px;
  width: auto;
}

.brand-logo-full:hover {
  transform: none;
  opacity: 0.85;
  transition: opacity var(--duration-fast);
}

/* — 深色背景页面导航栏：滚动前白色logo，滚动后恢复深色 — */
/* 深色hero页(.nav-inverse)：默认导航栏透明，logo通过滤镜变白 */
.nav-inverse:not(.scrolled) .brand-logo-full {
  filter: brightness(0) invert(1);
  transition: filter var(--duration-normal);
}

/* 滚动后导航栏白底出现，logo恢复本色 */
.nav-inverse.scrolled .brand-logo-full {
  filter: none;
  transition: filter var(--duration-normal);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand-sub {
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast);
  position: relative;
  padding: 4px 0;
  z-index: 1;
  pointer-events: auto;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width var(--duration-normal) var(--ease-out-expo);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link-cta {
  padding: 9px 22px;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-full);
  color: var(--color-accent);
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--duration-normal) var(--ease-out-expo);
  margin-left: var(--space-sm);
}

.nav-link-cta:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.25);
  transform: translateY(-1px);
}

.nav-link-cta::after {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  z-index: 1001;
}

.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal), opacity var(--duration-fast);
}

/* Mobile nav */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
    z-index: 100001;
  }

  .nav-menu {
    position: fixed;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    z-index: 99999 !important;
    background: #ffffff !important;
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 300ms ease, visibility 0s 300ms;
  }

  .nav-menu.active {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: all;
    z-index: 100000;
    transition: opacity 300ms ease, visibility 0s 0s;
  }

  /* 菜单打开时隐藏 header 自身的半透明背景和毛玻璃效果 */
  .site-header.menu-open {
    background: #ffffff !important;
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
    border-bottom: none !important;
    z-index: 100002;
  }

  .nav-link {
    font-size: 1.25rem;
    color: var(--color-primary) !important;
    position: relative;
    z-index: 1;
  }
}

/* ——— Hero (Premium Redesign) ——— */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  /* Subtle gradient overlay at top for header readability */
  background: linear-gradient(180deg, rgba(245,247,250,0.7) 0%, transparent 120px);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: brightness(0.82) saturate(0.85) contrast(1.02);
  transform: scale(1.02); /* Prevent white edges on scale */
  transition: transform 8s ease-out;
}

.hero:hover .hero-bg-img {
  transform: scale(1.06);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  /* Multi-stop gradient for depth */
  background: linear-gradient(
    180deg,
    rgba(245, 247, 250, 0.65) 0%,
    rgba(245, 247, 250, 0.35) 30%,
    rgba(245, 247, 250, 0.72) 75%,
    var(--color-bg) 100%
  );
  /* Subtle radial glow */
  background-blend-mode: normal;
}

/* Decorative top-right glow */
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.06), transparent 70%);
  z-index: 1;
  pointer-events: none;
}

/* Decorative bottom-left glow */
.hero::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(ellipse, rgba(201, 169, 110, 0.04), transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.hero-grid-pattern {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.035) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 120% 100% at 50% 50%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 120% 100% at 50% 50%, black 30%, transparent 75%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  padding: var(--space-lg);
  padding-top: calc(var(--nav-height) + var(--space-lg));
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(37, 99, 235, 0.15);
  color: var(--color-accent-dark);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.7s var(--ease-out-expo) 0.2s both;
  transition: background var(--duration-normal), border-color var(--duration-normal);
}

.hero-badge:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(37, 99, 235, 0.25);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 10px rgba(37, 99, 235, 0.5); }
  50% { opacity: 0.5; box-shadow: 0 0 20px rgba(37, 99, 235, 0.8); }
}

.hero-title {
  font-size: clamp(2.8rem, 6.5vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  color: var(--color-primary);
  line-height: 1.08;
  margin-bottom: var(--space-lg);
  /* Subtle text shadow for depth */
  text-shadow: 0 2px 40px rgba(37, 99, 235, 0.04);
}

.title-line {
  display: block;
  animation: fadeInUp 0.7s var(--ease-out-expo) 0.4s both;
}

.title-line.accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 50%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation-delay: 0.55s;
  position: relative;
}

/* Gold shimmer effect on accent text */
.title-line.accent::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { background-position: 200% center; }
  100% { background-position: -200% center; }
}

.hero-desc {
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-xl);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.7s var(--ease-out-expo) 0.7s both;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s var(--ease-out-expo) 0.85s both;
}

/* Premium button base */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 32px;
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3), 0 1px 3px rgba(0, 0, 0, 0.04);
}

.btn-primary::before {
  background: linear-gradient(135deg, var(--color-accent-dark) 0%, var(--color-accent) 100%);
}

.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(37, 99, 235, 0.4), 0 2px 8px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:active {
  transform: scale(0.98) translateY(0);
}

.btn-outline {
  color: var(--color-primary);
  border: 1.5px solid rgba(26, 54, 93, 0.2);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(26, 54, 93, 0.04);
  border-color: rgba(26, 54, 93, 0.35);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.hero-scroll {
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
  animation: float 2.5s ease-in-out infinite;
  transition: opacity var(--duration-normal);
}

.hero-scroll:hover {
  color: var(--color-accent);
}

.scroll-text {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ——— Promo Video Section ——— */
.promo-video-section {
  position: relative;
  z-index: 2;
}

.promo-video-container {
  width: 100%;
  padding: 0;
  margin: 0;
}

.promo-video {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  background: #000;
  object-fit: cover;
}

/* ——— Stats Bar (Premium Two-Row) ——— */
/* ======== Stats Bar (compact) ======== */
.stats-bar {
  background: linear-gradient(180deg, var(--color-bg) 0%, #f5f8ff 50%, var(--color-surface) 100%);
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
  z-index: 3;
  overflow: hidden;
}

.stats-bar::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -60px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(18,35,168,0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.stats-bar::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: -40px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(37,99,235,0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.stats-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  position: relative;
  z-index: 1;
}

.stats-row-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  max-width: 960px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
  padding: var(--space-md) var(--space-sm);
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(18,35,168,0.08);
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
  transition: transform 0.25s var(--ease-out-expo),
              box-shadow 0.25s var(--ease-out-expo),
              border-color 0.25s ease;
  cursor: default;
}

.stat-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(18,35,168,0.08), 0 2px 6px rgba(0,0,0,0.04);
  border-color: rgba(18,35,168,0.18);
}

.stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
  font-feature-settings: "tnum";
}

.stat-num small {
  font-size: 0.45em;
  font-weight: 500;
  opacity: 0.7;
  vertical-align: baseline;
  margin-left: 1px;
}

.stat-num--wide {
  font-size: clamp(0.9rem, 1.8vw, 1.15rem);
  letter-spacing: 0.04em;
}

.stat-desc {
  display: block;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}


@media (min-width: 768px) {
  .stats-container {
    padding: var(--space-xl) var(--space-xl);
  }

  .stats-row-grid {
    gap: var(--space-lg);
  }

  .stat-item {
    padding: var(--space-lg) var(--space-md);
  }

  .stat-num {
    font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  }

  .stat-num--wide {
    font-size: clamp(1rem, 1.6vw, 1.3rem);
  }

  .stat-desc {
    font-size: 0.78rem;
  }
}

@media (max-width: 639px) {
  .stats-row-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .stat-item {
    padding: var(--space-sm) var(--space-xs);
  }

  .stat-num {
    font-size: 1.25rem;
  }

  .stat-num--wide {
    font-size: 0.85rem;
  }

  .stat-desc {
    font-size: 0.68rem;
  }

  .stats-note {
    font-size: 0.7rem;
  }
}

.stats-note {
  text-align: center;
  max-width: 620px;
  margin: var(--space-md) auto 0;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  /* 默认可见，动画通过 animation 触发，避免永久空白 */
}

.stats-row-grid.prepared.visible ~ .stats-note {
  animation: noteFadeIn 0.5s ease 0.55s both;
}

@keyframes noteFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ——— About (Premium) ——— */
.about {
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
}

/* Subtle decorative element */
.about::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -15%;
  width: 50%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.02), transparent 70%);
  pointer-events: none;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
  position: relative;
  z-index: 1;
}

.about-lead {
  font-family: var(--font-heading);
  font-size: clamp(1.05rem, 1.3vw, 1.2rem);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
  line-height: 1.75;
}

.about-lead strong {
  color: var(--color-primary);
  font-weight: 600;
}

.about-text p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.85;
  font-size: 0.93rem;
}

/* ——— Value Cards (icon-top layout) ——— */
/* ——— About Values（核心优势标签行） ——— */
.about-values {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8eeff 50%, #f5f0ff 100%);
  border: 1px solid rgba(18,35,168,0.07);
}

.value-card {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  text-align: left;
  padding: 14px 18px;
  background: transparent;
  border: none;
  border-radius: 0;
  transition: background 0.3s ease;
  cursor: default;
  position: relative;
}

.value-card + .value-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(18,35,168,0.10);
}

.value-card:hover {
  background: rgba(255,255,255,0.55);
  transform: none;
  box-shadow: none;
  border-color: transparent;
}

.value-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  margin-bottom: 0;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 8px rgba(18,35,168,0.2);
}

.value-card:hover .value-icon {
  transform: scale(1) translateY(-1px);
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(18,35,168,0.3);
}

.value-card h4 {
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-primary-dark, #0a1460);
  margin: 0 0 1px;
  letter-spacing: 0.02em;
}

.value-card p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin: 0;
}

/* ——— About Visual ——— */
.about-visual {
  position: relative;
}

/* ——— Image Carousel ——— */
.about-carousel {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.about-carousel-track {
  width: 100%;
  height: 100%;
  position: relative;
}

.about-carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}

.about-carousel-slide.active {
  opacity: 1;
  pointer-events: auto;
}

.about-carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-carousel-label {
  position: absolute;
  bottom: 16px;
  left: 16px;
  padding: 6px 14px;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 6px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  color: var(--color-primary);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* Nav buttons */
.about-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.25s ease, background 0.25s ease;
  z-index: 3;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.about-carousel:hover .about-carousel-btn {
  opacity: 1;
}

.about-carousel-btn:hover {
  background: var(--color-primary);
  color: #fff;
}

.about-carousel-prev { left: 12px; }
.about-carousel-next { right: 12px; }

/* Dots */
.about-carousel-dots {
  position: absolute;
  bottom: 12px;
  right: 16px;
  display: flex;
  gap: 6px;
  z-index: 3;
}

.about-carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.45);
  cursor: pointer;
  padding: 0;
  transition: background 0.25s ease, transform 0.25s ease;
}

.about-carousel-dot.active {
  background: #fff;
  transform: scale(1.25);
}

.about-carousel-dot:hover {
  background: rgba(255,255,255,0.75);
}

/* ——— Responsive ——— */
@media (max-width: 767px) {
  .about-values {
    flex-direction: column;
    gap: 1px;
    border-radius: var(--radius-lg);
  }

  .value-card + .value-card::before {
    display: none;
  }

  .value-card {
    padding: 12px 16px;
  }

  .value-icon {
    width: 32px;
    height: 32px;
    min-width: 32px;
  }

  .value-card h4 {
    font-size: 0.88rem;
  }

  .value-card p {
    font-size: 0.72rem;
  }
}

@media (min-width: 768px) {
  .about-grid {
    max-width: 820px;
    margin: 0 auto;
  }
}

@media (min-width: 1024px) {
  .about-grid {
    gap: 64px;
  }
}

/* ——— Services (Premium) ——— */
.services {
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

/* Subtle decorative background */
.services::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 40%;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.015), transparent 70%);
  pointer-events: none;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  position: relative;
  z-index: 1;
}

.service-card {
  background: var(--color-surface);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition:
    transform var(--duration-normal) var(--ease-out-back),
    box-shadow var(--duration-normal) var(--ease-out-expo),
    border-color var(--duration-normal);
  position: relative;
  overflow: hidden;
}

/* Premium top accent line */
.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light), var(--color-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.service-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.03), transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-accent);
}

.service-card:hover::before {
  transform: scaleX(1);
}

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

/* Compact header: number badge + icon on same line */
.service-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.service-number {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  flex-shrink: 0;
  transition: transform var(--duration-normal) var(--ease-out-back);
}

.service-card:hover .service-number {
  transform: scale(1.1);
}

.service-icon-wrap {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  transition: background var(--duration-normal), color var(--duration-fast), transform var(--duration-normal) var(--ease-out-back);
}

.service-icon-wrap svg {
  width: 18px;
  height: 18px;
}

.service-card:hover .service-icon-wrap {
  background: var(--color-accent);
  color: #fff;
  transform: scale(1.05) rotate(-3deg);
}

.service-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 6px;
  line-height: 1.35;
}

.service-card h3 a {
  color: var(--color-primary);
  transition: color var(--duration-fast);
  display: inline-block;
}

.service-card h3 a:hover {
  color: var(--color-accent);
}

/* Always visible, compact link */
.card-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-top: 10px;
  opacity: 1;
  transform: translateX(0);
  transition: color var(--duration-fast), gap var(--duration-fast);
  text-decoration: none;
  cursor: pointer;
}

.card-more:hover {
  color: var(--color-primary);
  gap: 8px;
}

.card-more:hover span:last-child,
.card-more:hover svg {
  transform: translateX(4px);
}

.service-card:hover .card-more {
  opacity: 1;
  transform: translateX(0);
}

.service-card p {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* ======== 紧凑版服务卡片（业务范围） ======== */
.service-card-compact {
  padding: 14px 16px;
}

.service-card-compact .service-card-header {
  margin-bottom: 8px;
}

.service-card-compact h3 {
  font-size: 0.95rem;
  margin-bottom: 8px;
}

/* 关键词标签容器 */
.service-tags {
  display: inline-flex !important;
  flex-wrap: wrap !important;
  gap: 5px !important;
  margin-bottom: 10px !important;
}

/* 关键词标签 - pill胶囊样式 */
.service-tags span {
  display: inline-block !important;
  font-size: 0.72rem !important;
  color: #94a3b8 !important;
  background: #e4ebf8 !important;
  border: 1px solid #f1f5f9 !important;
  border-radius: 10px !important;
  padding: 2px 9px !important;
  line-height: 1.6 !important;
  white-space: nowrap !important;
  transition: all 0.15s ease !important;
}

.service-card:hover .service-tags span {
  background: rgba(37, 99, 235, 0.08) !important;
  border-color: rgba(37, 99, 235, 0.25) !important;
  color: #2563eb !important;
}

.service-card-compact .card-more {
  margin-top: auto;
}

/* ======== 移动端：横排紧凑行布局 ======== */
@media (max-width: 639px) {
  .services .section-header {
    margin-bottom: 20px;
    text-align: left;
  }

  .services .section-header.center {
    text-align: left;
  }

  .services .section-title {
    font-size: 1.3rem;
    line-height: 1.35;
  }

  .services .section-desc {
    display: none; /* 移动端隐藏副标题，节省空间 */
  }

  /* 网格改为紧凑列表 */
  .services-grid {
    grid-template-columns: 1fr !important;
    gap: 0 !important; /* 无间距，用边框分隔 */
  }

  /* 移动端卡片：竖向紧凑卡片（保持标签pill样式）*/
  .service-card-compact {
    padding: 14px 16px !important;
    border-radius: 0 !important;
    border-left: none !important;
    border-right: none !important;
  }

  /* 分割线效果 */
  .service-card-compact + .service-card-compact {
    border-top: 1px solid var(--color-border-light) !important;
  }

  /* 第一张卡片的顶部圆角 */
  .services-grid > .service-card-compact:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0 !important;
    border-top: 1px solid var(--color-border-light) !important;
  }

  /* 最后一张卡片的底部圆角 */
  .services-grid > .service-card-compact:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md) !important;
    border-bottom: 1px solid var(--color-border-light) !important;
  }

  /* 编号区横向排列 */
  .service-card-compact .service-card-header {
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  /* 编号徽章缩小 */
  .service-card-compact .service-number {
    width: 28px !important;
    height: 28px !important;
    font-size: 0.72rem !important;
    flex-shrink: 0;
  }

  /* 隐藏移动端header里的图标，只保留编号 */
  .service-card-compact .service-icon-wrap {
    display: none;
  }

  /* 标题紧凑 */
  .service-card-compact h3 {
    font-size: 0.88rem;
    margin-bottom: 6px;
    line-height: 1.3;
  }

  /* ======== 关键词标签：确保pill胶囊样式 ======== */
  .service-card-compact .service-tags {
    display: inline-flex !important;
    flex-wrap: wrap !important;
    gap: 5px !important;
    margin-bottom: 8px !important;
  }

  .service-card-compact .service-tags span {
    display: inline-block !important;
    font-size: 0.68rem !important;
    color: var(--color-text-muted) !important;
    background: var(--color-bg-alt) !important;
    border: 1px solid var(--color-border-light) !important;
    border-radius: 4px !important;
    padding: 2px 8px !important;
    line-height: 1.5 !important;
    white-space: nowrap !important;
  }

  /* 了解详情链接 */
  .service-card-compact .card-more {
    margin-top: 0;
    font-size: 0.78rem;
    opacity: 0.7;
    transition: opacity var(--duration-fast);
  }

  .service-card-compact:hover .card-more {
    opacity: 1;
  }

  /* hover效果简化 - 不做位移了 */
  .service-card-compact:hover {
    transform: none !important;
    box-shadow: none !important;
    background: rgba(18, 35, 168, 0.02) !important;
  }

  /* hover时标签变色 */
  .service-card-compact:hover .service-tags span {
    background: rgba(37, 99, 235, 0.06) !important;
    border-color: rgba(37, 99, 235, 0.2) !important;
    color: var(--color-accent) !important;
  }
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1000px;
    margin: 0 auto;
    gap: 20px;
  }
}

/* ——— Lab Services (Premium) ——— */
.lab-services {
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.lab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  position: relative;
  z-index: 1;
}

.lab-card {
  background: #fff;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition:
    transform var(--duration-normal) var(--ease-out-back),
    box-shadow var(--duration-normal),
    border-color var(--duration-normal);
}

.lab-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(18,35,168,0.08);
  border-color: rgba(18,35,168,0.15);
}

/* ——— Card visual: image carousel at top ——— */
.lab-card-visual {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-alt);
  position: relative;
  cursor: pointer;
}

.lab-carousel {
  width: 100%;
  height: 100%;
  position: relative;
}

.lab-carousel-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.lab-carousel-img.active {
  opacity: 1;
}

.lab-carousel-dots {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 5px;
  z-index: 2;
}

.lab-carousel-dots::before {
  content: '';
  display: flex;
  gap: 5px;
}

/* Dots rendered via JS — fallback styling */
.lab-carousel-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.45);
  transition: all var(--duration-normal);
  display: inline-block;
}

.lab-carousel-dot.active {
  background: #fff;
  width: 18px;
  border-radius: 3px;
}

/* ——— Lab carousel arrows ——— */
.lab-carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: rgba(255,255,255,0.18);
  backdrop-filter: blur(4px);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease, background 0.2s;
}
.lab-carousel:hover .lab-carousel-arrow { opacity: 1; }
.lab-carousel-arrow:hover { background: rgba(255,255,255,0.35); }
.lab-carousel-prev { left: 8px; }
.lab-carousel-next { right: 8px; }

/* ——— Lightbox ——— */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s 0.3s;
}
.lightbox-overlay.active { opacity: 1; visibility: visible; transition: opacity 0.3s ease, visibility 0s 0s; }
.lightbox-img-wrapper { max-width: 90vw; max-height: 80vh; display: flex; align-items: center; justify-content: center; }
.lightbox-img { max-width: 90vw; max-height: 80vh; object-fit: contain; border-radius: 6px; }
.lightbox-close { position: fixed; top: 12px; left: 12px; width: 44px; height: 44px; border: none; border-radius: 50%; background: rgba(255,255,255,0.12); color: #fff; font-size: 1.5rem; cursor: pointer; z-index: 100001; display: flex; align-items: center; justify-content: center; transition: background 0.2s; }
.lightbox-close:hover { background: rgba(255,255,255,0.25); }
.lightbox-nav { position: fixed; top: 50%; transform: translateY(-50%); width: 48px; height: 48px; border: none; border-radius: 50%; background: rgba(255,255,255,0.12); color: #fff; font-size: 1.8rem; cursor: pointer; z-index: 100001; display: flex; align-items: center; justify-content: center; transition: background 0.2s; }
.lightbox-nav:hover { background: rgba(255,255,255,0.25); }
.lightbox-nav.prev { left: 16px; }
.lightbox-nav.next { right: 16px; }
@media (max-width: 600px) {
  .lightbox-nav.prev { left: 6px; } .lightbox-nav.next { right: 6px; }
  .lightbox-nav { width: 40px; height: 40px; font-size: 1.5rem; }
  .lightbox-close { top: 8px; left: 8px; width: 38px; height: 38px; font-size: 1.3rem; }
}

/* ——— Card body: text below image ——— */
.lab-card-body {
  padding: var(--space-md) var(--space-md) var(--space-lg);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.lab-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.lab-card h3 a {
  color: inherit;
  text-decoration: none;
}

.lab-card h3 a:hover {
  color: var(--color-accent);
}

.lab-card p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin: 0;
  max-width: 280px;
}

.lab-card .card-more {
  margin-top: auto;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--duration-fast);
}

.lab-card .card-more:hover {
  gap: 8px;
}

/* Responsive */
@media (min-width: 768px) {
  .lab-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
/* ——— Workflow (Premium) ——— */
.workflow {
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

/* Subtle diagonal stripe decoration */
.workflow::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 60px,
    rgba(37, 99, 235, 0.008) 60px,
    rgba(37, 99, 235, 0.008) 61px
  );
  pointer-events: none;
}

.workflow .section-title {
  color: var(--color-primary);
}

.workflow .section-tag {
  color: var(--color-accent-dark);
  background: rgba(37, 99, 235, 0.1);
}

/* ——— Workflow / 流程步骤 ——— */
/* 紧凑横向步骤条，桌面端一行展示全部 5 步 */

.workflow-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: var(--space-lg);
  position: relative;
  z-index: 1;
}

.workflow-step {
  flex: 1;
  text-align: center;
  position: relative;
  padding: 0 var(--space-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 连接线（在数字之间） */
.workflow-step::after {
  content: '';
  position: absolute;
  top: 18px;          /* 圆圈中心 */
  left: calc(50% + 18px);
  width: calc(100% - 36px);
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), rgba(18,35,168,0.18));
  opacity: 0.35;
  z-index: 1;
}

/* 最后一步无连接线 */
.workflow-step:last-child::after {
  display: none;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  box-shadow: 0 3px 12px rgba(18,35,168,0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  flex-shrink: 0;
  margin-bottom: var(--space-sm);
}

.workflow-step:hover .step-number {
  transform: scale(1.15);
  background: var(--color-accent);
  box-shadow: 0 4px 16px rgba(37,99,235,0.4);
}

.step-line {
  display: none;      /* 用 ::after 伪元素替代 */
}

.workflow-step h4 {
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.3;
  transition: color 0.2s ease;
  margin-bottom: 2px;
}

.workflow-step:hover h4 {
  color: var(--color-primary);
}

.workflow-step p {
  color: var(--color-text-muted);
  font-size: 0.72rem;
  line-height: 1.45;
  max-width: 140px;
  margin: 0;
}

@media (max-width: 767px) {
  .workflow-steps {
    flex-wrap: wrap;
    gap: var(--space-md) 0;
  }

  .workflow-step {
    flex: 0 0 33.333%;
    padding: 0 var(--space-xs);
  }

  /* 第 4、5 步居中 */
  .workflow-step:nth-child(4),
  .workflow-step:nth-child(5) {
    flex: 0 0 50%;
  }

  .workflow-step::after,
  .workflow-step:nth-child(3)::after,
  .workflow-step:nth-child(5)::after {
    display: none;
  }
}

/* ——— Why Us (Premium) ——— */
/* ——— Comparison Section (行业对比) ——— */
.compare {
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
  padding: var(--space-3xl) 0;
}

.compare::before {
  content: '';
  position: absolute;
  top: -5%;
  right: -8%;
  width: 45%;
  height: 50%;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.03), transparent 70%);
  pointer-events: none;
}

.compare .section-header {
  margin-bottom: var(--space-xl);
}

/* ——— Comparison Grid ——— */
.compare-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
}

/* ——— Row: 3 cols (us | divider | them) ——— */
.compare-row {
  display: grid;
  grid-template-columns: 1.15fr auto 1fr;
  gap: var(--space-sm);
  align-items: stretch;
  transition: all var(--duration-normal);
  border-radius: var(--radius-lg);
  padding: 2px; /* space for hover border */
}

.compare-row:hover {
  background: rgba(18, 35, 168, 0.02);
  box-shadow: 0 4px 20px rgba(18, 35, 168, 0.04);
}

/* ——— Card Base ——— */
.compare-card {
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: all var(--duration-normal);
  overflow: hidden;
}

/* ——— Our Side (京图瑞景) — Stronger visual weight ——— */
.compare-card--us {
  background: linear-gradient(135deg, #eef2ff 0%, #f5f7ff 50%, #fff 100%);
  border: 1px solid rgba(18, 35, 168, 0.10);
  border-left: 3px solid var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  box-shadow: 0 1px 4px rgba(18, 35, 168, 0.04);
}

.compare-row:hover .compare-card--us {
  background: linear-gradient(135deg, #e8edfc 0%, #f0f3ff 50%, #fafbff 100%);
  border-color: rgba(18, 35, 168, 0.16);
  box-shadow: 0 4px 16px rgba(18, 35, 168, 0.08);
  transform: translateX(2px);
}

/* ——— Thumbnail ——— */
.compare-thumb {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: cover;
  display: block;
  border: none;
  box-shadow: none;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Left badge (京图瑞景) — premium brand feel */
.compare-thumb--us-badge {
  box-shadow: 0 2px 12px rgba(18, 35, 168, 0.10),
              0 1px 3px rgba(0, 0, 0, 0.04);
}
.compare-card--us:hover .compare-thumb--us-badge {
  transform: scale(1.05);
  box-shadow: 0 4px 20px rgba(18, 35, 168, 0.16),
              0 2px 6px rgba(0, 0, 0, 0.06);
}

/* Right badge (行业现状) — muted, recessed feel */
.compare-thumb--them {
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}
.compare-card--them:hover .compare-thumb--them {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.10);
}

/* ——— Check Icon (filled circle style) ——— */
.compare-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-normal);
}

.compare-icon--check {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
}

.compare-icon--check svg {
  filter: drop-shadow(0 1px 1px rgba(0,0,0,0.15));
}

.compare-card--us:hover .compare-icon--check {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.35);
}

/* ——— Their Side (痛点) — Muted, secondary feel ——— */
.compare-card--them {
  background: #f8f9fb;
  border: 1px solid rgba(0, 0, 0, 0.05);
  padding: var(--space-md) var(--space-lg);
}

.compare-card--them:hover {
  background: #f3f4f6;
  border-color: rgba(220, 38, 38, 0.08);
  transform: translateX(-2px);
}

.compare-icon--warn {
  background: rgba(239, 68, 68, 0.07);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.06);
}

.compare-card--them:hover .compare-icon--warn {
  background: rgba(239, 68, 68, 0.12);
  transform: scale(1.08);
}

/* ——— Text ——— */
.compare-text {
  flex: 1;
  min-width: 0;
}

.compare-text h4 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 3px;
  line-height: 1.35;
  transition: color var(--duration-fast);
}

.compare-card--us .compare-text h4 {
  color: var(--color-primary-dark);
}

.compare-text p {
  font-size: 0.81rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin: 0;
}

.compare-card--them .compare-text h4 {
  color: #4b5563;
  font-weight: 500;
}

.compare-card--them .compare-text p {
  color: #9ca3af;
  font-size: 0.79rem;
}

/* ——— Divider (VS) — More prominent ——— */
.compare-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  position: relative;
  flex-shrink: 0;
}

.compare-divider::before {
  content: '';
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent 0%, #d1d5db 20%, #d1d5db 80%, transparent 100%);
}

.compare-divider span {
  position: relative;
  z-index: 1;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #9ca3af;
  background: var(--color-bg);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid #d1d5db;
  transition: all var(--duration-normal);
  text-transform: uppercase;
}

.compare-row:hover .compare-divider span {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 2px 8px rgba(18, 35, 168, 0.12);
  transform: scale(1.05);
}

/* ——— CTA Summary Row — compact, breathes naturally ——— */
.compare-cta {
  position: relative;
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  background: transparent;
}

/* Decorative top separator line */
.compare-cta::before {
  content: '';
  display: block;
  width: 48px;
  height: 2px;
  background: var(--color-primary);
  margin: 0 auto var(--space-sm);
  border-radius: 1px;
  opacity: 0.5;
}

.compare-cta p {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  color: var(--color-primary-dark);
  letter-spacing: 0.02em;
  line-height: 1.7;
}

/* Brand tag */
.compare-cta p::before {
  content: '京图瑞景';
  display: inline;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(18, 35, 168, 0.1);
  padding: 3px 10px;
  border-radius: 4px;
  margin-right: 6px;
  vertical-align: 1px;
  letter-spacing: 0.05em;
}

/* ——— Responsive ——— */
@media (min-width: 768px) {
  .compare-grid {
    gap: var(--space-sm);
  }
  .compare-text h4 {
    font-size: 1rem;
  }
  .compare-text p {
    font-size: 0.83rem;
  }
  .compare-thumb {
    width: 68px;
    height: 68px;
  }

  .compare-cta {
    padding: var(--space-md) var(--space-lg);
  }
}

@media (max-width: 767px) {
  .compare-grid {
    gap: var(--space-md);
  }

  .compare-row {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    padding: var(--space-md);
    position: relative;
    overflow: hidden;
  }

  .compare-row::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-primary);
    border-radius: 3px 0 0 3px;
  }

  .compare-card {
    border-radius: var(--radius-sm);
    border: none !important;
    border-left: none !important;
  }

  .compare-card--us {
    background: rgba(18, 35, 168, 0.02);
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }

  .compare-thumb {
    width: 64px;
    height: 64px;
    border-radius: 16px;
  }

  .compare-icon {
    width: 32px;
    height: 32px;
  }

  .compare-card--them {
    background: #f9fafb;
    padding: var(--space-sm) var(--space-md);
  }

  .compare-divider {
    width: auto;
    height: 24px;
    justify-content: flex-start;
    padding-left: var(--space-md);
    margin-top: var(--space-xs);
  }

  .compare-divider::before {
    top: 50%;
    left: 0;
    bottom: auto;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent 5%, #e5e7eb 30%, #e5e7eb 70%, transparent 95%);
  }

  .compare-divider span {
    font-size: 0.55rem;
    width: 22px;
    height: 22px;
  }

  .compare-text p {
    font-size: 0.78rem;
  }

  .compare-cta {
    padding: var(--space-sm) var(--space-md);
    max-width: 100%;
  }

  .compare-cta p {
    font-size: 0.9rem;
  }

  .compare-cta p::before {
    font-size: 0.7rem;
    padding: 2px 8px;
  }
}

/* ——— CTA (Premium) ——— */
.cta {
  position: relative;
  padding: var(--space-2xl) var(--space-lg);
  min-height: 80vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-bg);
}

.cta::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -10%;
  width: 50%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(201, 169, 110, 0.025), transparent 70%);
  pointer-events: none;
}

.cta-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cta-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.5) saturate(0.35) blur(1px);
  transform: scale(1.02);
}

.cta-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(245, 247, 250, 0.94) 0%,
    rgba(255, 255, 255, 0.88) 50%,
    rgba(245, 247, 250, 0.92) 100%
  );
}

.cta-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  width: 100%;
}

.cta-desc {
  color: var(--color-text-secondary);
  font-size: clamp(0.9rem, 1.1vw, 1.05rem);
  margin-bottom: var(--space-lg);
  line-height: 1.75;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.cta-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.cta-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(226, 232, 240, 0.7);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--duration-normal),
    transform var(--duration-normal) var(--ease-out-back),
    border-color var(--duration-normal);
}

.cta-card:hover {
  background: var(--color-surface);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-accent);
}

.cta-card-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto var(--space-sm);
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(37,99,235,0.15));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  transition: transform var(--duration-normal) var(--ease-out-back), box-shadow var(--duration-normal);
}

.cta-card:hover .cta-card-icon {
  transform: scale(1.08);
  box-shadow: 0 0 24px rgba(37, 99, 235, 0.15);
}

.cta-card h4 {
  color: var(--color-primary);
  font-size: 1rem;
  margin-bottom: 4px;
}

.cta-card p {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  line-height: 1.55;
  margin-bottom: var(--space-sm);
}

.cta-card-contact {
  display: block;
  color: var(--color-accent-dark);
  font-weight: 500;
  font-size: 0.88rem;
  font-family: var(--font-heading);
  transition: color var(--duration-fast);
}

.cta-card-contact:hover {
  color: var(--color-accent);
}

/* ---- CTA 微信咨询卡片（点击展开二维码） ---- */
.cta-card-wechat {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-md);
}

.cta-card-body {
  flex: 1;
}

/* <details> 原生展开收起，无需 JS */
.wechat-qr-details {
  display: inline-block;
  margin-top: 6px;
}

.wechat-qr-details > summary {
  list-style: none; /* 隐藏默认三角箭头 */
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent-dark);
  font-weight: 500;
  font-size: 0.88rem;
  font-family: var(--font-heading);
  transition: color var(--duration-fast);
  user-select: none;
}

.wechat-qr-details > summary::-webkit-details-marker {
  display: none;
}

.wechat-qr-details > summary:hover {
  color: var(--color-accent);
}

.cta-card-qr {
  margin-top: 10px;
  display: flex;
  justify-content: center;
  animation: qrFadeIn 0.3s ease;
}

@keyframes qrFadeIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.cta-card-qr img {
  display: block;
  border-radius: 8px;
  width: 100px;
  height: 100px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.wechat-trigger-icon {
  flex-shrink: 0;
  color: var(--color-accent);
}

/* 联系我们页面二维码略小 */
.contact-info-item .cta-card-qr img {
  width: 90px;
  height: 90px;
}

@media (min-width: 640px) {
  .cta-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ——— Footer (Premium) ——— */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.65);
  padding: var(--space-2xl) var(--space-lg) var(--space-lg);
  position: relative;
  overflow: hidden;
}

/* Subtle top gradient for depth */
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.3), transparent);
}

/* Decorative glow */
.site-footer::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 50%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.04), transparent 70%);
  pointer-events: none;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand p {
  margin-top: var(--space-md);
}

.footer-logo-img {
  display: block;
  height: 80px;
  width: auto;
  object-fit: contain;
  border-radius: 0;
  opacity: 0.95;
  transition: opacity var(--duration-fast);
}

.footer-logo-img:hover {
  opacity: 1;
}

.footer-desc {
  font-size: 0.85rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.72);
  margin-top: var(--space-md);
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md) var(--space-lg);
  position: relative;
  z-index: 2;
}

.footer-col h4 {
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 6px;
}

/* Gold accent underline on column titles */
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--duration-fast), transform var(--duration-fast);
  display: inline-block;
  position: relative;
  z-index: 2;
  pointer-events: auto;
}

.footer-col a:hover {
  color: var(--color-accent-light);
  transform: translateX(2px);
}

/* Footer contact — detailed list */
.footer-contact {
  grid-column: auto;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.35);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.footer-contact-list a,
.footer-contact-list > li > span:last-child {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.84rem;
}

.footer-contact-list a:hover {
  color: var(--color-accent-light);
}

/* ======== WeChat QR Code (Footer) ======== */
.wechat-contact {
  display: flex;
  align-items: center;
  gap: 10px;
}

.wechat-contact > span {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.84rem;
}

.wechat-qr-wrap {
  position: relative;
  display: inline-flex;
  cursor: pointer;
  /* anchor for hover popup */
}

.wechat-qr {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  opacity: 0.75;
  transition: opacity 0.25s, transform 0.25s;
  object-fit: contain;
}

.wechat-qr-wrap:hover .wechat-qr {
  opacity: 1;
  transform: scale(1.15);
}

/* Enlarged QR popup on hover */
.wechat-qr-wrap::after {
  content: "";
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) scale(0.6);
  width: 160px;
  height: 160px;
  background: url("../assets/images/wechat-qr.jpg") center / contain no-repeat;
  background-color: #fff;
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 100;
}

.wechat-qr-wrap:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

.footer-bottom {
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.35);
}

.footer-beian a {
  color: rgba(255, 255, 255, 0.4);
  text-decoration: none;
  transition: color var(--duration-fast);
}

.footer-beian a:hover {
  color: rgba(255, 255, 255, 0.7);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1.2fr 2fr;
  }

  .footer-links {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-contact {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ——— Back to Top (Premium) ——— */
.back-to-top {
  position: fixed;
  bottom: 36px;
  right: 36px;
  z-index: 100;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md), 0 0 0 0 rgba(37, 99, 235, 0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px) scale(0.9);
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    transform var(--duration-normal) var(--ease-out-back),
    box-shadow var(--duration-normal),
    background var(--duration-fast);
  animation: none;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--color-accent-dark) 0%, var(--color-accent) 100%);
  box-shadow: var(--shadow-lg), 0 0 0 8px rgba(37, 99, 235, 0.15);
  transform: translateY(-3px) scale(1.05);
}

/* Pulse ring animation on hover */
.back-to-top::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(37, 99, 235, 0.2);
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.back-to-top:hover::after {
  opacity: 1;
  animation: pulse-ring 1.5s ease-out infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.5); opacity: 0; }
}

/* ——— Animations (Premium) ——— */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(37, 99, 235, 0.4); }
  50% { opacity: 0.4; box-shadow: 0 0 20px rgba(37, 99, 235, 0.7); }
}

/* ——— Scroll Reveal (Enhanced) ——— */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.75s var(--ease-out-expo),
    transform 0.75s var(--ease-out-expo);
}

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

/* Reveal from left */
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition:
    opacity 0.75s var(--ease-out-expo),
    transform 0.75s var(--ease-out-expo);
}

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

/* Reveal from right */
.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition:
    opacity 0.75s var(--ease-out-expo),
    transform 0.75s var(--ease-out-expo);
}

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

/* Reveal scale */
.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition:
    opacity 0.75s var(--ease-out-expo),
    transform 0.75s var(--ease-out-expo);
}

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

/* ——— Stagger Children ——— */
/*
  安全动画策略：
  1. 默认完全可见（无 opacity:0）
  2. JS 先加 .prepared → 元素立即隐藏（opacity:0）
  3. JS 再加 .visible → 触发 animation 滑入（不依赖 transition 状态变化）
  4. 如果 JS 完全失效，内容仍然可见，只是没有动画
*/
.stagger > * {
  will-change: opacity, transform;
}

/* .prepared：隐藏状态，等待动画触发 */
.stagger.prepared > * {
  opacity: 0;
  transform: translateY(28px);
}

/* .visible 触发后，播放滑入动画（用 animation 而非 transition，
   避免浏览器合并样式计算导致动画不触发） */
.stagger.prepared.visible > *:nth-child(1) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 0ms   forwards; }
.stagger.prepared.visible > *:nth-child(2) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 90ms  forwards; }
.stagger.prepared.visible > *:nth-child(3) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 180ms forwards; }
.stagger.prepared.visible > *:nth-child(4) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 270ms forwards; }
.stagger.prepared.visible > *:nth-child(5) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 360ms forwards; }
.stagger.prepared.visible > *:nth-child(6) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 450ms forwards; }
.stagger.prepared.visible > *:nth-child(7) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 540ms forwards; }
.stagger.prepared.visible > *:nth-child(8) { animation: staggerSlideIn 0.55s var(--ease-out-expo) 630ms forwards; }

@keyframes staggerSlideIn {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ——— About 区域专属动画 ——— */

/* 阶段 1（.prepared 已加，.visible 尚未加）：
   隐藏 .value-card，等待 .visible 触发再滑入 */
.about-text.stagger.prepared:not(.visible) .about-values .value-card {
  opacity: 0;
  transform: translateX(-20px);
}

/* 阶段 2（.visible 已加）：
   .about-values 容器通过通用 .stagger.prepared.visible > *
   规则滑入；内部 .value-card 紧随其后依次从左侧滑入 */
.about-text.stagger.prepared.visible .about-values .value-card:nth-child(1) {
  animation: valueSlideIn 1s var(--ease-out-expo) 600ms forwards;
}
.about-text.stagger.prepared.visible .about-values .value-card:nth-child(2) {
  animation: valueSlideIn 1s var(--ease-out-expo) 950ms forwards;
}
.about-text.stagger.prepared.visible .about-values .value-card:nth-child(3) {
  animation: valueSlideIn 1s var(--ease-out-expo) 1300ms forwards;
}

@keyframes valueSlideIn {
  from { opacity: 0; transform: translateX(-32px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ——— 统计数字弹启动画 ——— */
@keyframes statNumBounce {
  0%   { opacity: 0; transform: scale(0.5); }
  50%  { opacity: 1; transform: scale(1.12); }
  70%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}

.stagger.prepared.visible .stat-num {
  animation: statNumBounce 0.45s var(--ease-out-expo) both;
}
.stagger.prepared.visible .stat-item:nth-child(1) .stat-num { animation-delay: 0ms;   }
.stagger.prepared.visible .stat-item:nth-child(2) .stat-num { animation-delay: 190ms; }
.stagger.prepared.visible .stat-item:nth-child(3) .stat-num { animation-delay: 280ms; }
.stagger.prepared.visible .stat-item:nth-child(4) .stat-num { animation-delay: 370ms; }
.stagger.prepared.visible .stat-item:nth-child(5) .stat-num { animation-delay: 460ms; }
.stagger.prepared.visible .stat-item:nth-child(6) .stat-num { animation-delay: 550ms; }
.stagger.prepared.visible .stat-item:nth-child(7) .stat-num { animation-delay: 640ms; }
.stagger.prepared.visible .stat-item:nth-child(8) .stat-num { animation-delay: 730ms; }

/* ——— Scroll Progress Bar ——— */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light), var(--color-gold));
  z-index: 10001;
  transition: width 80ms linear;
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.scroll-progress.visible {
  opacity: 1;
}

/* ——— Reduced Motion ——— */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .reveal-scale {
    opacity: 1 !important;
    transform: none !important;
  }

  .stagger > * {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ——— cases — 科研服务案例 (Premium) ——— */
.cases {
  background: var(--color-bg);
}

.cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.case-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  transition:
    transform var(--duration-normal) var(--ease-out-back),
    box-shadow var(--duration-normal) var(--ease-out-expo),
    border-color var(--duration-normal);
  position: relative;
  overflow: hidden;
}

.case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light), var(--color-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-accent);
}

.case-card:hover::before {
  transform: scaleX(1);
}

.case-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.case-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-accent-dark);
}

.case-year {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.case-title {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
  line-height: 1.35;
}

.case-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.case-tech-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-light);
  font-weight: 400;
  transition: border-color var(--duration-fast);
}

.case-tech-tag:hover {
  border-color: var(--color-border-accent);
}

.cases-more {
  text-align: center;
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.cases-more-text {
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* ——— lab-gallery — 实验操作展示 (Premium) ——— */
.lab-gallery {
  background: var(--color-surface);
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-normal);
}

.gallery-item:hover {
  box-shadow: var(--shadow-lg);
}

.gallery-item-wide {
  aspect-ratio: 16/9;
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slower) var(--ease-out-expo);
}

.gallery-item:hover .gallery-img {
  transform: scale(1.06);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg);
  background: linear-gradient(0deg, rgba(10, 22, 40, 0.85) 0%, rgba(10, 22, 40, 0.3) 70%, transparent 100%);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: background var(--duration-normal);
}

.gallery-item:hover .gallery-overlay {
  background: linear-gradient(0deg, rgba(10, 22, 40, 0.92) 0%, rgba(10, 22, 40, 0.5) 70%, rgba(10, 22, 40, 0.1) 100%);
}

.gallery-label {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
}

.gallery-sub {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.7);
}

.gallery-note {
  text-align: center;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

/* ——— news — 公司新闻动态 (Premium) ——— */
.news {
  background: var(--color-bg);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.news-item {
  display: flex;
  gap: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition:
    transform var(--duration-normal) var(--ease-out-back),
    box-shadow var(--duration-normal),
    border-color var(--duration-normal);
  align-items: flex-start;
}

.news-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-accent);
}

.news-date-wrap {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 68px;
  height: 76px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: border-color var(--duration-fast);
}

.news-item:hover .news-date-wrap {
  border-color: var(--color-border-accent);
}

.news-month {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  letter-spacing: 0.05em;
}

.news-day {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
}

.news-year {
  font-size: 0.68rem;
  color: var(--color-text-muted);
}

.news-body {
  flex: 1;
}

.news-meta {
  margin-bottom: 6px;
}

.news-category {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-accent-dark);
}

.news-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  margin-bottom: var(--space-sm);
  line-height: 1.35;
}

.news-title a {
  color: var(--color-primary);
  transition: color var(--duration-fast);
}

.news-title a:hover {
  color: var(--color-accent);
}

.news-excerpt {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.news-more {
  text-align: center;
  margin-top: var(--space-xl);
}

/* ——— Button Variants (Premium) ——— */
.btn-outline-primary {
  color: var(--color-accent-dark);
  border: 1.5px solid rgba(37, 99, 235, 0.3);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 13px 30px;
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.btn-outline-primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
  transform: translateY(-2px);
}

/* ——— cases/lab-gallery/news responsive ——— */
@media (min-width: 640px) {
  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery-item-wide {
    grid-column: span 2;
  }

  .news-item {
    gap: var(--space-xl);
    padding: var(--space-xl);
  }
}

@media (min-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ——— Print Styles ——— */
@media print {
  .site-header,
  .hero-scroll,
  .back-to-top {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 40px 0;
  }

  .hero-bg-img {
    display: none;
  }

  .hero-title {
    color: var(--color-primary);
  }

  .hero-desc {
    color: var(--color-text);
  }

}