/* ==========================================================================
   Yixi Technology (意曦科技) — Main Stylesheet
   Ultra-minimal tech style, blue color scheme
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  --navy-900: #0D1B2A;
  --navy-800: #152232;
  --navy-700: #1C2D3E;
  --blue-600: #0040A0;
  --blue-500: #0052CC;
  --blue-400: #1A6DDD;
  --blue-50:  #EEF4FF;
  --cyan-500: #0099D4;
  --cyan-400: #00C3FF;
  --cyan-300: #4FDEFF;
  --gray-50:  #F8F9FA;
  --gray-100: #F0F2F5;
  --gray-200: #E2E7ED;
  --gray-300: #C9D0DA;
  --text-dark: #111827;
  --text-body: #374151;
  --text-secondary: #4B5563;
  --text-muted: #6B7280;
  --white: #fff;

  --font-cn: 'Noto Sans SC', sans-serif;
  --font-en: 'Space Grotesk', 'Inter', sans-serif;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 40px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 12px rgba(0,99,204,0.07);
  --shadow-md: 0 8px 30px rgba(0,99,204,0.10);
  --shadow-lg: 0 16px 50px rgba(0,99,204,0.14);
  --shadow-xl: 0 28px 80px rgba(0,99,204,0.18);

  --transition: 0.28s cubic-bezier(0.4,0,0.2,1);

  --nav-h: 72px;
  --max-w: 1280px;
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-cn);
  color: var(--text-body);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul,
ol {
  list-style: none;
}

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

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-cn);
  color: var(--text-dark);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }
h4 { font-size: 1rem; }

p { line-height: 1.8; }

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue-500);
  margin-bottom: 16px;
}

.section-heading {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.8;
}

.gradient-text {
  background: linear-gradient(135deg, var(--cyan-400), var(--blue-400));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* --------------------------------------------------------------------------
   4. Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
  width: 100%;
}

.section {
  padding: 108px 0;
}

.section--alt {
  background: var(--gray-100);
}

.section--dark {
  background: var(--navy-900);
  color: var(--white);
}

.section--dark .section-heading {
  color: var(--white);
}

.section--dark .section-sub {
  color: rgba(255,255,255,0.6);
}

.section-header {
  margin-bottom: 60px;
}

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

.section-header--center .section-sub {
  margin: 0 auto;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* --------------------------------------------------------------------------
   5. Navbar
   -------------------------------------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

/* Transparent state on hero pages */
body.has-hero .site-nav {
  background: transparent;
}

body.has-hero .site-nav .nav-links a,
body.has-hero .site-nav .nav-lang-btn {
  color: rgba(255,255,255,0.85);
}

body.has-hero .site-nav .nav-links a:hover,
body.has-hero .site-nav .nav-links a.active {
  color: var(--cyan-400);
}

body.has-hero .site-nav:not(.scrolled) .nav-logo img {
  filter: brightness(0) invert(1);
}

/* Scrolled state */
.site-nav.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(0,99,204,0.08), var(--shadow-sm);
}

body.has-hero .site-nav.scrolled .nav-links a {
  color: var(--text-body);
}

body.has-hero .site-nav.scrolled .nav-lang-btn {
  color: var(--text-body);
}

body.has-hero .site-nav.scrolled .nav-links a:hover,
body.has-hero .site-nav.scrolled .nav-links a.active {
  color: var(--blue-500);
}

/* Non-hero pages: always styled */
body:not(.has-hero) .site-nav {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(0,99,204,0.08), var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-dark);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  height: 36px;
  width: auto;
  transition: filter var(--transition);
}

.site-footer .nav-logo img {
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding-bottom: 4px;
  white-space: nowrap;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--blue-500);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--blue-500);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Language toggle */
.nav-lang {
  display: flex;
  align-items: center;
  background: rgba(0,99,204,0.07);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}

.nav-lang-btn,
.nav-lang a {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.nav-lang-btn.active,
.nav-lang-btn:hover,
.nav-lang a.active,
.nav-lang a:hover {
  background: var(--blue-500);
  color: var(--white);
}

body.has-hero .site-nav:not(.scrolled) .nav-lang a {
  color: rgba(255,255,255,0.7);
}
body.has-hero .site-nav:not(.scrolled) .nav-lang a.active,
body.has-hero .site-nav:not(.scrolled) .nav-lang a:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

/* CTA button in nav */
.nav-cta .btn-sm {
  padding: 9px 20px;
  font-size: 0.82rem;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   6. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: var(--navy-900);
  overflow: hidden;
  padding-top: var(--nav-h);
}

#particles-js {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: auto;
  /* Feather edges: soft vignette so particles fade toward the border */
  -webkit-mask-image: radial-gradient(
    ellipse 108% 92% at 50% 46%,
    #000 0%,
    #000 38%,
    rgba(0, 0, 0, 0.48) 66%,
    transparent 100%
  );
  mask-image: radial-gradient(
    ellipse 108% 92% at 50% 46%,
    #000 0%,
    #000 38%,
    rgba(0, 0, 0, 0.48) 66%,
    transparent 100%
  );
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  mask-mode: alpha;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  align-items: center;
  width: 100%;
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
}

.hero-content {
  padding: 60px 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  color: rgba(255,255,255,0.85);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.05;
  text-wrap: balance;
  margin-bottom: 24px;
}

.hero h1 .gradient-text {
  display: inline-block;
  max-width: 100%;
  background: linear-gradient(135deg, #93C5FD, #60A5FA);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero p {
  color: rgba(255,255,255,0.7);
  font-size: 1.1rem;
  max-width: 520px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-img-frame {
  position: relative;
  width: 100%;
  max-width: 520px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 40px 100px rgba(0,0,0,0.5);
  border: 1px solid rgba(0,195,255,0.2);
}

.hero-img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-img-frame::before {
  content: '';
  position: absolute;
  inset: -40px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(0,195,255,0.12) 0%, transparent 70%);
  animation: heroGlow 4s ease-in-out infinite alternate;
  z-index: -1;
  pointer-events: none;
}

.hero-img-frame::after {
  content: '';
  position: absolute;
  inset: -70px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(0,128,255,0.08) 0%, transparent 70%);
  animation: heroGlow 4s ease-in-out infinite alternate-reverse;
  z-index: -1;
  pointer-events: none;
}

@keyframes heroGlow {
  from { opacity: 0.5; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.08); }
}

/* --------------------------------------------------------------------------
   7. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
  text-decoration: none;
  line-height: 1;
}

.btn-sm {
  padding: 9px 20px;
  font-size: 0.82rem;
}

.btn--primary {
  background: var(--blue-500);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(0,82,204,0.30);
}

.btn--primary:hover {
  background: var(--blue-600);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(0,82,204,0.35);
  color: var(--white);
}

.btn--outline {
  border: 2px solid var(--blue-500);
  color: var(--blue-500);
  background: transparent;
}

.btn--outline:hover {
  background: var(--blue-500);
  color: var(--white);
  transform: translateY(-2px);
}

.btn--ghost {
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--white);
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.16);
  transform: translateY(-2px);
}

.btn--dark {
  background: var(--navy-900);
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.12);
}

.btn--dark:hover {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   8. Labels / Pills
   -------------------------------------------------------------------------- */
.label {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.label--blue {
  background: var(--blue-50);
  color: var(--blue-500);
  border: 1px solid rgba(0,82,204,0.18);
}

.label--white {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.9);
  border: 1px solid rgba(255,255,255,0.2);
}

.label--navy {
  background: rgba(0,99,204,0.1);
  color: var(--blue-500);
  border: 1px solid rgba(0,99,204,0.15);
}

/* --------------------------------------------------------------------------
   9. Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0,99,204,0.08);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: var(--blue-500);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
  border-radius: 3px 0 0 3px;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,99,204,0.16);
}

.card:hover::before {
  transform: scaleY(1);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--blue-50);
  color: var(--blue-500);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  flex-shrink: 0;
}

.card h3 {
  margin-bottom: 10px;
  color: var(--text-dark);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   10. Product Cards
   -------------------------------------------------------------------------- */
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,99,204,0.08);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.product-card-img {
  height: 220px;
  overflow: hidden;
  position: relative;
  background: var(--gray-100);
}

.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.4,0,0.2,1);
  transform: scale(1.01);
}

.product-card:hover .product-card-img img {
  transform: scale(1.07);
}

.product-card-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, rgba(2,13,27,0.55), transparent);
  pointer-events: none;
}

.product-card--no-img .product-card-body {
  padding: 28px 28px 24px;
}

.product-card-body {
  padding: 24px 28px;
}

.product-card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--blue-50);
  color: var(--blue-500);
  border: 1px solid rgba(0,82,204,0.15);
  margin-bottom: 10px;
}

.product-card-body h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text-dark);
}

.product-card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blue-500);
  font-size: 0.875rem;
  font-weight: 600;
  transition: gap var(--transition), color var(--transition);
}

.product-card-link:hover {
  gap: 10px;
  color: var(--blue-400);
}

/* --------------------------------------------------------------------------
   11. App Cards
   -------------------------------------------------------------------------- */
.app-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,99,204,0.08);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.app-card-img {
  height: 260px;
  overflow: hidden;
  position: relative;
  background: var(--gray-100);
}

.app-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.4,0,0.2,1), filter 0.4s ease;
}

@media (hover: hover) and (pointer: fine) {
  .app-card-img img {
    filter: grayscale(1) brightness(0.97);
  }

  .app-card:hover .app-card-img img {
    filter: none;
    transform: scale(1.06);
  }
}

.app-card-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(2,13,27,0.7), transparent 50%);
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 20px;
}

.app-card:hover .app-card-img-overlay {
  opacity: 1;
}

.app-card--no-img .app-card-body {
  padding: 26px 26px 22px;
  border-top: 2px solid var(--blue-500);
}

.app-card-body {
  padding: 22px 26px;
}

.app-card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--blue-50);
  color: var(--blue-500);
  border: 1px solid rgba(0,82,204,0.15);
  margin-bottom: 10px;
}

.app-card-body h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text-dark);
}

.app-card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   12. News Cards
   -------------------------------------------------------------------------- */
.news-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,99,204,0.08);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.news-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.news-card-img {
  height: 200px;
  overflow: hidden;
  position: relative;
  background: var(--gray-100);
}

.news-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(1);
  transition:
    transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    filter 0.45s ease;
}

.news-card:hover .news-card-img img,
.news-card:focus-within .news-card-img img {
  transform: scale(1.06);
  filter: grayscale(0);
}

@media (prefers-reduced-motion: reduce) {
  .news-card-img img {
    transition: none;
    filter: grayscale(0);
  }

  .news-card:hover .news-card-img img,
  .news-card:focus-within .news-card-img img {
    transform: none;
  }
}

.news-card-body {
  padding: 22px 24px;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.news-meta-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-en);
}

.news-meta-cat {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--cyan-500);
  background: rgba(0,195,255,0.10);
  border: 1px solid rgba(0,195,255,0.2);
  padding: 2px 9px;
  border-radius: var(--radius-full);
}

.news-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.4;
  margin-bottom: 10px;
  transition: color var(--transition);
}

.news-card:hover .news-card-title {
  color: var(--blue-500);
}

.news-card-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

a.news-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

a.news-card:focus-visible {
  outline: 2px solid var(--primary, #0063cc);
  outline-offset: 3px;
}

a.news-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--text-dark);
  transition: color var(--transition);
}

a.news-card:hover h3 {
  color: var(--blue-500);
}

a.news-card .news-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

a.news-card .news-card-body p:last-of-type {
  flex: 1;
}

/* News article detail */
.news-article-wrap {
  padding: 48px 0 80px;
}

.news-article {
  max-width: 720px;
  margin: 0 auto;
}

.news-article-header .label {
  margin-bottom: 12px;
}

.news-article-header h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text-dark);
}

.news-article-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.news-article .lead {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.news-article h2 {
  font-size: 1.2rem;
  margin: 36px 0 14px;
  color: var(--text-dark);
}

.news-article p,
.news-article li {
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.news-article ul,
.news-article ol {
  margin: 0 0 18px;
  padding-left: 1.25rem;
}

.news-article .note {
  font-size: 0.88rem;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--gray-100);
  color: var(--text-muted);
  margin-top: 32px;
}

.news-article-hero-img {
  margin: 8px 0 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0, 99, 204, 0.08);
  background: var(--gray-100);
}

.news-article-hero-img img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(1);
  transition: filter 0.45s ease;
}

.news-article-hero-img:hover img,
.news-article-hero-img:focus-within img {
  filter: grayscale(0);
}

@media (prefers-reduced-motion: reduce) {
  .news-article-hero-img img {
    transition: none;
    filter: grayscale(0);
  }
}

/* In-page target: news detail body (below fixed nav) */
#article {
  scroll-margin-top: calc(var(--nav-h) + 24px);
  outline: none;
}

/* --------------------------------------------------------------------------
   13. Stats
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.stat-item {
  text-align: center;
  padding: 36px 24px;
  position: relative;
}

.stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 25%;
  height: 50%;
  width: 1px;
  background: rgba(0,99,204,0.12);
}

.section--dark .stat-item + .stat-item::before {
  background: rgba(255,255,255,0.1);
}

.stat-num {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-en);
  color: var(--blue-500);
  line-height: 1;
  display: block;
}

.section--dark .stat-num {
  color: var(--cyan-400);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 8px;
  display: block;
}

.section--dark .stat-label {
  color: rgba(255,255,255,0.5);
}

/* --------------------------------------------------------------------------
   14. Service Blocks
   -------------------------------------------------------------------------- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
  padding: 72px 0;
  border-bottom: 1px solid rgba(0,99,204,0.06);
}

.service-block:last-child {
  border-bottom: none;
}

.service-block:nth-child(even),
.service-block--reverse {
  direction: rtl;
}

.service-block:nth-child(even) > *,
.service-block--reverse > * {
  direction: ltr;
}

.service-block-img {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  position: relative;
}

.service-block-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
  filter: grayscale(1);
  transition:
    transform 0.55s cubic-bezier(0.4, 0, 0.2, 1),
    filter 0.45s ease;
}

.service-block:hover .service-block-img img,
.service-block:focus-within .service-block-img img {
  transform: scale(1.04);
  filter: grayscale(0);
}

.service-block-content h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.service-block-content p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

.service-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-body);
}

.service-features li::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  min-width: 6px;
  border-radius: 50%;
  background: var(--blue-500);
  margin-top: 7px;
  flex-shrink: 0;
}

@media (prefers-reduced-motion: reduce) {
  .service-block-img img {
    transition: none;
    filter: grayscale(0);
  }

  .service-block:hover .service-block-img img,
  .service-block:focus-within .service-block-img img {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   15. Page Hero (inner pages)
   -------------------------------------------------------------------------- */
.page-hero {
  background: var(--navy-900);
  padding: 150px 0 90px;
  position: relative;
  overflow: hidden;
}

.page-hero > #particles-js {
  position: absolute;
  inset: 0;
  z-index: 0;
  /* 底部与白色区域衔接：粒子在末端渐隐，避免与遮罩“顶边”生硬 */
  -webkit-mask-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 1) 40%,
    rgba(0, 0, 0, 0.72) 62%,
    rgba(0, 0, 0, 0.28) 82%,
    rgba(0, 0, 0, 0.06) 93%,
    rgba(0, 0, 0, 0) 100%
  );
  mask-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 1) 40%,
    rgba(0, 0, 0, 0.72) 62%,
    rgba(0, 0, 0, 0.28) 82%,
    rgba(0, 0, 0, 0.06) 93%,
    rgba(0, 0, 0, 0) 100%
  );
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  mask-mode: alpha;
}

.page-hero > .container {
  position: relative;
  z-index: 2;
}

.page-hero::before {
  display: none;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: min(200px, 26vw);
  pointer-events: none;
  z-index: 1;
  /* 多段羽化：深蓝粒子区 → 白底，避免线性硬棱 */
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0) 8%,
    rgba(255, 255, 255, 0.02) 22%,
    rgba(255, 255, 255, 0.08) 38%,
    rgba(255, 255, 255, 0.22) 55%,
    rgba(255, 255, 255, 0.48) 72%,
    rgba(255, 255, 255, 0.82) 88%,
    rgba(255, 255, 255, 0.96) 96%,
    var(--white) 100%
  );
}

.page-hero.page-hero--alt::after {
  background: linear-gradient(
    to bottom,
    rgba(240, 242, 245, 0) 0%,
    rgba(240, 242, 245, 0) 8%,
    rgba(240, 242, 245, 0.03) 22%,
    rgba(240, 242, 245, 0.12) 38%,
    rgba(240, 242, 245, 0.32) 55%,
    rgba(240, 242, 245, 0.62) 72%,
    rgba(240, 242, 245, 0.88) 88%,
    rgba(240, 242, 245, 0.97) 96%,
    var(--gray-100) 100%
  );
}

.page-hero h1 {
  color: var(--white);
  margin-bottom: 16px;
}

.page-hero .section-heading--hero-blue {
  color: var(--blue-400);
  text-shadow: 0 0 32px rgba(26, 109, 221, 0.4);
}

.page-hero p {
  color: rgba(255,255,255,0.65);
  font-size: 1.05rem;
  max-width: 560px;
}

/* About page — company profile visual: particles + brand text */
@keyframes about-brand-line-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.about-brand-visual {
  position: relative;
  width: 100%;
  min-height: 260px;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: linear-gradient(145deg, #111827 0%, #1b2838 48%, #151f2e 100%);
  border: none;
  outline: none;
  isolation: isolate;
  /* 外缘柔白光：融入浅色区块，无实线描边感 */
  box-shadow:
    0 0 56px 28px rgba(255, 255, 255, 0.45),
    0 0 24px rgba(255, 255, 255, 0.28);
  -webkit-mask-image: radial-gradient(
    ellipse 122% 118% at 50% 50%,
    #000 0%,
    #000 34%,
    rgba(0, 0, 0, 0.9) 44%,
    rgba(0, 0, 0, 0.62) 56%,
    rgba(0, 0, 0, 0.34) 68%,
    rgba(0, 0, 0, 0.14) 80%,
    rgba(0, 0, 0, 0.04) 90%,
    transparent 100%
  );
  mask-image: radial-gradient(
    ellipse 122% 118% at 50% 50%,
    #000 0%,
    #000 34%,
    rgba(0, 0, 0, 0.9) 44%,
    rgba(0, 0, 0, 0.62) 56%,
    rgba(0, 0, 0, 0.34) 68%,
    rgba(0, 0, 0, 0.14) 80%,
    rgba(0, 0, 0, 0.04) 90%,
    transparent 100%
  );
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  mask-mode: alpha;
}

/* 四向边缘线性渐变 + 径向光晕（压在粒子上、在文案下） */
.about-brand-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.55) 0%,
      rgba(255, 255, 255, 0.12) 22%,
      transparent 48%
    ),
    linear-gradient(
      to top,
      rgba(255, 255, 255, 0.52) 0%,
      rgba(255, 255, 255, 0.1) 20%,
      transparent 46%
    ),
    linear-gradient(
      to right,
      rgba(255, 255, 255, 0.42) 0%,
      rgba(255, 255, 255, 0.08) 18%,
      transparent 44%
    ),
    linear-gradient(
      to left,
      rgba(255, 255, 255, 0.42) 0%,
      rgba(255, 255, 255, 0.08) 18%,
      transparent 44%
    ),
    radial-gradient(
      ellipse 98% 95% at 50% 50%,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0) 50%,
      rgba(255, 255, 255, 0.12) 70%,
      rgba(255, 255, 255, 0.38) 86%,
      rgba(255, 255, 255, 0.62) 96%,
      rgba(255, 255, 255, 0.78) 100%
    );
}

.about-brand-visual__particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 1;
  border: none;
  outline: none;
  /* 羽化只在父级做一次，避免双层 mask 错开形成圈边 */
}

.about-brand-visual__particles canvas {
  display: block;
  border: none;
  outline: none;
}

.about-brand-visual__text {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  pointer-events: none;
  padding: clamp(16px, 4vw, 28px);
}

.about-brand-visual__zh {
  font-family: var(--font-cn);
  font-size: clamp(2rem, 5.5vw, 2.85rem);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.96);
  letter-spacing: 0.14em;
  line-height: 1.3;
  text-shadow:
    0 0 28px rgba(0, 195, 255, 0.45),
    0 2px 16px rgba(0, 0, 0, 0.45);
  animation: about-brand-line-float 3.6s ease-in-out infinite;
  will-change: transform;
}

.about-brand-visual__en {
  font-family: var(--font-en);
  font-size: clamp(1rem, 2.85vw, 1.35rem);
  font-weight: 600;
  letter-spacing: 0.42em;
  color: rgba(0, 195, 255, 0.9);
  text-transform: uppercase;
  line-height: 1.2;
  text-shadow: 0 0 20px rgba(0, 195, 255, 0.35);
  animation: about-brand-line-float 3s ease-in-out 0.2s infinite;
  will-change: transform;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--cyan-400);
}

.breadcrumb-sep {
  opacity: 0.4;
}

.trust-section {
  background: var(--gray-100);
  padding: 72px 0;
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}

.trust-section .section-eyebrow,
.trust-section h2 {
  color: var(--text-dark);
}

.trust-logo-item {
  border: 1px solid var(--gray-200);
  padding: 16px 32px;
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  background: var(--white);
  transition: border-color var(--transition), color var(--transition), box-shadow var(--transition);
  cursor: default;
}

.trust-logo-item:hover {
  border-color: var(--blue-500);
  color: var(--blue-500);
  box-shadow: var(--shadow-sm);
}

.trust-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   17. CTA Banner
   -------------------------------------------------------------------------- */
.cta-banner {
  background: var(--navy-900);
  border-radius: var(--radius-xl);
  padding: 80px 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
}

.cta-banner::before { display: none; }
.cta-banner::after  { display: none; }

.cta-banner h2 {
  color: var(--white);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  margin-bottom: 36px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}

.cta-banner .cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* --------------------------------------------------------------------------
   18. Contact
   -------------------------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: start;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid rgba(0,99,204,0.08);
  padding: 20px 0;
}

.contact-info-item:first-of-type {
  padding-top: 0;
}

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: var(--radius-sm);
  background: var(--blue-500);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.contact-info-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact-info-value {
  font-size: 0.9rem;
  color: var(--text-dark);
  font-weight: 500;
}

.contact-form-card {
  background: var(--white);
  padding: 44px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,99,204,0.06);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid rgba(0,99,204,0.12);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--gray-50);
  color: var(--text-dark);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus {
  border-color: var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(0,195,255,0.10);
}

.form-input.error {
  border-color: #e53e3e;
  box-shadow: 0 0 0 3px rgba(229,62,62,0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-success,
.form-error {
  display: none;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  margin-top: 16px;
}

.form-success {
  background: rgba(0,195,255,0.08);
  border: 1px solid rgba(0,195,255,0.25);
  color: var(--cyan-500);
}

.form-error {
  background: rgba(229,62,62,0.07);
  border: 1px solid rgba(229,62,62,0.2);
  color: #c53030;
}

.form-success.visible,
.form-error.visible {
  display: block;
}

/* --------------------------------------------------------------------------
   19. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--navy-900);
  color: var(--white);
  padding: 70px 0 0;
  border-top: 1px solid rgba(0,195,255,0.08);
}

.site-footer__particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.5) 0%,
    #000 18%,
    #000 82%,
    rgba(0, 0, 0, 0.45) 100%
  );
  mask-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.5) 0%,
    #000 18%,
    #000 82%,
    rgba(0, 0, 0, 0.45) 100%
  );
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  mask-repeat: no-repeat;
}

.site-footer__particles canvas {
  pointer-events: none;
}

.site-footer > .container {
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .nav-logo {
  color: var(--white);
  margin-bottom: 16px;
}

.footer-brand p {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  line-height: 1.8;
}

.footer-heading {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links li a {
  color: rgba(255,255,255,0.55);
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-links li a:hover {
  color: var(--cyan-400);
}

.footer-contact-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: rgba(255,255,255,0.55);
  font-size: 0.875rem;
  margin-bottom: 12px;
  line-height: 1.6;
}

.footer-contact-row:last-child {
  margin-bottom: 0;
}

.footer-contact-icon {
  color: rgba(255,255,255,0.45);
  margin-top: 2px;
  flex-shrink: 0;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  padding: 24px 0;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.3);
}

.footer-bottom-icp {
  color: rgba(255, 255, 255, 0.3);
  transition: color var(--transition);
}

.footer-bottom-icp:hover {
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255,255,255,0.3);
  transition: color var(--transition);
}

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

/* Legal / policy documents */
.legal-doc {
  max-width: 720px;
  margin: 0 auto;
}

.legal-doc h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.legal-doc h2:first-of-type {
  margin-top: 0;
}

.legal-doc p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  font-size: 0.9375rem;
}

.legal-doc ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 0.9375rem;
}

.legal-doc li + li {
  margin-top: 0.35rem;
}

.legal-doc ul a {
  color: var(--cyan-500);
  font-weight: 500;
}

.legal-doc ul a:hover {
  text-decoration: underline;
}

.legal-doc .legal-updated {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.legal-doc nav.legal-internal {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(0, 99, 204, 0.12);
  font-size: 0.875rem;
}

.legal-doc nav.legal-internal a {
  color: var(--cyan-500);
  font-weight: 500;
}

.legal-doc nav.legal-internal a:hover {
  text-decoration: underline;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.footer-social-link:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
  background: rgba(0,195,255,0.07);
}

/* --------------------------------------------------------------------------
   20. Animations
   -------------------------------------------------------------------------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

.stagger > *:nth-child(1) { transition-delay: 0s; }
.stagger > *:nth-child(2) { transition-delay: 0.08s; }
.stagger > *:nth-child(3) { transition-delay: 0.16s; }
.stagger > *:nth-child(4) { transition-delay: 0.24s; }
.stagger > *:nth-child(5) { transition-delay: 0.32s; }
.stagger > *:nth-child(6) { transition-delay: 0.40s; }

/* --------------------------------------------------------------------------
   21. Utility
   -------------------------------------------------------------------------- */

/* ---- Homepage: Product Feature Grid ---- */
.product-feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--gray-200);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.product-feature-item {
  background: var(--white);
  padding: 40px 44px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background var(--transition);
  text-decoration: none;
  position: relative;
}

.product-feature-item:hover {
  background: var(--gray-50);
}

.product-feature-num {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--blue-500);
  text-transform: uppercase;
}

.product-feature-item h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
  line-height: 1.3;
}

.product-feature-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin: 0;
  flex: 1;
}

.product-feature-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-500);
  margin-top: 4px;
  transition: gap var(--transition);
}

.product-feature-item:hover .product-feature-link {
  gap: 10px;
}

/* ---- Products Page: Brand Section ---- */
.brand-section {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--gray-200);
}

.brand-section:last-of-type {
  border-bottom: none;
}

.brand-intro {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 60px;
  align-items: start;
  padding-bottom: 56px;
}

.brand-intro-left {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.brand-intro-label {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--blue-500);
  margin-bottom: 10px;
  display: block;
}

.brand-intro-name {
  font-size: clamp(1.6rem, 2.5vw, 2rem);
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.15;
  margin-bottom: 0;
}

.brand-intro-right {
  border-left: 2px solid var(--gray-200);
  padding-left: 48px;
}

.brand-intro-right p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}

.brand-intro-right p:last-child {
  margin-bottom: 0;
}

.brand-products {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.brand-products--1col {
  grid-template-columns: 1fr;
}

/* 产品类目标题锚点：避开固定导航 */
.brand-product-card[id] {
  scroll-margin-top: calc(var(--nav-h) + 24px);
}

.brand-product-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  transition: border-color var(--transition), box-shadow var(--transition);
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(120px, min(44%, 340px));
  gap: 20px 28px;
  align-items: end;
}

.brand-product-card__body {
  min-width: 0;
  align-self: start;
}

.brand-product-card__media {
  border-radius: var(--radius-md);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  min-width: 0;
  width: 100%;
  max-width: 340px;
  align-self: end;
  justify-self: end;
  box-sizing: border-box;
}

.brand-product-card__media img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: min(360px, 50vh);
  min-height: 0;
  object-fit: contain;
  object-position: center bottom;
  display: block;
  transition: filter 0.4s ease;
}

@media (hover: hover) and (pointer: fine) {
  .brand-product-card__media img {
    filter: grayscale(1) brightness(0.97);
  }

  .brand-product-card:hover .brand-product-card__media img {
    filter: none;
  }
}

/* Larger product visuals: interferometer, optics, optical systems, electrochemistry */
.brand-product-card--media-xl {
  grid-template-columns: minmax(0, 1fr) minmax(120px, min(52%, 420px));
}

.brand-product-card--media-xl .brand-product-card__media {
  max-width: 420px;
}

.brand-product-card--media-xl .brand-product-card__media img {
  max-height: min(440px, 58vh);
}

.brand-product-card:hover {
  border-color: var(--blue-500);
  box-shadow: var(--shadow-md);
}

.brand-product-category {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--blue-500);
  background: var(--blue-50);
  border: 1px solid rgba(0,82,204,0.15);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 16px;
}

.brand-product-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
  line-height: 1.3;
}

.brand-product-card__body > p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.brand-product-card .service-features {
  margin-bottom: 24px;
}

.brand-product-card .service-features li {
  font-size: 0.875rem;
  color: var(--text-body);
}

/* ---- Utility classes ---- */
.text-white  { color: var(--white); }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.gap-16 { gap: 16px; }
.hidden { display: none !important; }

/* Grid pattern background utility */
.bg-grid {
  background-image:
    linear-gradient(rgba(0,195,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,195,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* --------------------------------------------------------------------------
   22. Map / Embed
   -------------------------------------------------------------------------- */
.map-embed {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 320px;
  border: 1px solid rgba(0,99,204,0.08);
  box-shadow: var(--shadow-sm);
  margin-top: 28px;
}

.map-embed iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* --------------------------------------------------------------------------
   23. Responsive — 1024px
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner {
    max-width: 100%;
    text-align: center;
  }

  .hero p {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .brand-intro {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .brand-intro-left {
    position: static;
  }

  .brand-intro-right {
    border-left: none;
    border-top: 2px solid var(--gray-200);
    padding-left: 0;
    padding-top: 32px;
  }

  .product-feature-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    justify-content: center;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .service-block {
    gap: 48px;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .stat-item:nth-child(odd) + .stat-item::before {
    display: none;
  }

  .stat-item:nth-child(3)::before,
  .stat-item:nth-child(4)::before {
    top: 0;
    height: 1px;
    width: 80%;
    left: 10%;
    background: rgba(0,99,204,0.12);
  }
}

/* --------------------------------------------------------------------------
   24. Responsive — 768px (Mobile)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .brand-products {
    grid-template-columns: 1fr;
  }

  .brand-product-card {
    grid-template-columns: 1fr;
    padding: 24px 20px;
    gap: 20px;
    align-items: stretch;
  }

  .brand-product-card--media-xl {
    grid-template-columns: 1fr;
  }

  .brand-product-card__body {
    align-self: stretch;
  }

  .brand-product-card__media {
    order: 1;
    justify-self: end;
    max-width: min(100%, 380px);
    margin-top: 4px;
  }

  .brand-product-card__media img {
    max-height: min(260px, 55vw);
  }

  .brand-product-card--media-xl .brand-product-card__media {
    max-width: min(100%, 400px);
  }

  .brand-product-card--media-xl .brand-product-card__media img {
    max-height: min(300px, 62vw);
  }

  .product-feature-item {
    padding: 28px 24px;
  }

  .page-hero {
    padding: 120px 0 60px;
  }

  /* Mobile nav */
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 24px 28px;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
    z-index: 999;
    overflow-y: auto;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.05rem;
    padding: 16px 0;
    border-bottom: 1px solid rgba(0,99,204,0.07);
    color: var(--text-body);
  }

  .nav-links a::after {
    display: none;
  }

  .nav-links a.active,
  .nav-links a:hover {
    color: var(--blue-500);
  }

  body.has-hero .site-nav.scrolled .nav-links a,
  body.has-hero .site-nav .nav-links a {
    color: var(--text-body);
  }

  body.has-hero .site-nav.scrolled .nav-links a.active,
  body.has-hero .site-nav .nav-links a.active,
  body.has-hero .site-nav.scrolled .nav-links a:hover,
  body.has-hero .site-nav .nav-links a:hover {
    color: var(--blue-500);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  body.has-hero .site-nav:not(.scrolled) .nav-toggle {
    color: var(--white);
  }

  /* Grids to single column */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0;
  }

  .service-block:nth-child(even) {
    direction: ltr;
  }

  .cta-banner {
    padding: 40px 24px;
    border-radius: var(--radius-lg);
  }

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

  .stat-item + .stat-item::before {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand {
    max-width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .contact-form-card {
    padding: 28px 20px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .nav-lang {
    display: none;
  }

  .hero h1 {
    font-size: clamp(2.2rem, 9vw, 3.5rem);
  }

  .hero h1 .gradient-text {
    font-size: clamp(1.2rem, 3.35vw + 0.75rem, 3.5rem);
  }

  .hero-badge {
    font-size: 0.7rem;
  }

  .hero-content {
    padding: 40px 0 30px;
  }

  .hero-inner {
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --nav-h: 64px;
  }

  .container {
    padding: 0 18px;
  }

  .section {
    padding: 52px 0;
  }

  .stat-num {
    font-size: 2.4rem;
  }

  .trust-logo-item {
    padding: 12px 20px;
    font-size: 0.78rem;
  }
}

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

  .site-footer__particles {
    display: none !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .about-brand-visual__zh,
  .about-brand-visual__en {
    animation: none;
  }

  .hero-img-frame::before,
  .hero-img-frame::after {
    animation: none;
  }
}