:root {
  --jiuyi-primary: #e94560;
  --jiuyi-primary-dark: #c73650;
  --jiuyi-primary-light: #ff6b81;
  --jiuyi-secondary: #0f3460;
  --jiuyi-secondary-light: #1a4a7a;
  --jiuyi-bg: #f5f6fa;
  --jiuyi-bg-alt: #ffffff;
  --jiuyi-bg-card: #ffffff;
  --jiuyi-bg-glass: rgba(255, 255, 255, 0.72);
  --jiuyi-bg-glass-border: rgba(255, 255, 255, 0.35);
  --jiuyi-text: #1a1a2e;
  --jiuyi-text-secondary: #4a4a5a;
  --jiuyi-text-muted: #7a7a8a;
  --jiuyi-border: #e2e4ea;
  --jiuyi-shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --jiuyi-shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --jiuyi-shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --jiuyi-shadow-glow: 0 8px 32px rgba(233, 69, 96, 0.28);
  --jiuyi-radius-sm: 8px;
  --jiuyi-radius-md: 14px;
  --jiuyi-radius-lg: 22px;
  --jiuyi-radius-xl: 32px;
  --jiuyi-transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --jiuyi-transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --jiuyi-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --jiuyi-max-width: 1200px;
}

html.dark-mode {
  --jiuyi-bg: #12121f;
  --jiuyi-bg-alt: #1a1a2e;
  --jiuyi-bg-card: #1e1e34;
  --jiuyi-bg-glass: rgba(26, 26, 46, 0.78);
  --jiuyi-bg-glass-border: rgba(255, 255, 255, 0.08);
  --jiuyi-text: #eaeaf0;
  --jiuyi-text-secondary: #b0b0c0;
  --jiuyi-text-muted: #7a7a90;
  --jiuyi-border: #2a2a44;
  --jiuyi-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --jiuyi-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --jiuyi-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --jiuyi-shadow-glow: 0 8px 32px rgba(233, 69, 96, 0.4);
}

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

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

body {
  font-family: var(--jiuyi-font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--jiuyi-text);
  background: var(--jiuyi-bg);
  transition: background-color var(--jiuyi-transition), color var(--jiuyi-transition);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--jiuyi-primary);
  text-decoration: none;
  transition: color var(--jiuyi-transition), opacity var(--jiuyi-transition);
}

a:hover {
  color: var(--jiuyi-primary-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--jiuyi-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

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

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--jiuyi-bg-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--jiuyi-bg-glass-border);
  transition: background var(--jiuyi-transition), box-shadow var(--jiuyi-transition), border-color var(--jiuyi-transition);
}

#site-header.scrolled {
  box-shadow: var(--jiuyi-shadow-md);
}

.header-inner {
  max-width: var(--jiuyi-max-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--jiuyi-text);
  font-weight: 700;
}

.logo svg {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  transition: transform var(--jiuyi-transition);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.logo-text {
  font-size: 1.35rem;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, var(--jiuyi-primary), var(--jiuyi-primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#main-nav {
  flex: 1;
  min-width: 0;
}

#main-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

#main-nav a {
  display: inline-block;
  padding: 7px 12px;
  border-radius: var(--jiuyi-radius-sm);
  font-size: 0.9rem;
  color: var(--jiuyi-text-secondary);
  font-weight: 500;
  position: relative;
  transition: color var(--jiuyi-transition), background var(--jiuyi-transition), transform var(--jiuyi-transition);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--jiuyi-primary), var(--jiuyi-primary-light));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--jiuyi-transition);
}

#main-nav a:hover {
  color: var(--jiuyi-primary);
  background: rgba(233, 69, 96, 0.08);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  width: 60%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.search-form {
  display: flex;
  align-items: center;
  background: var(--jiuyi-bg-alt);
  border: 1px solid var(--jiuyi-border);
  border-radius: 999px;
  overflow: hidden;
  transition: border-color var(--jiuyi-transition), box-shadow var(--jiuyi-transition), background var(--jiuyi-transition);
}

.search-form:focus-within {
  border-color: var(--jiuyi-primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.15);
}

.search-form input[type="search"] {
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--jiuyi-text);
  width: 150px;
  outline: none;
  font-family: inherit;
}

.search-form input[type="search"]::placeholder {
  color: var(--jiuyi-text-muted);
}

.search-form button {
  border: none;
  background: linear-gradient(135deg, var(--jiuyi-primary), var(--jiuyi-primary-dark));
  color: #fff;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--jiuyi-transition), transform var(--jiuyi-transition);
}

.search-form button:hover {
  opacity: 0.9;
  transform: scale(1.03);
}

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--jiuyi-border);
  background: var(--jiuyi-bg-alt);
  color: var(--jiuyi-text);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition), border-color var(--jiuyi-transition), box-shadow var(--jiuyi-transition);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: scale(1.1) rotate(8deg);
  border-color: var(--jiuyi-primary);
  box-shadow: var(--jiuyi-shadow-sm);
}

#menu-toggle {
  display: none;
}

#mobile-nav {
  border-top: 1px solid var(--jiuyi-border);
  background: var(--jiuyi-bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  animation: slideDown 0.3s ease;
}

#mobile-nav[hidden] {
  display: none;
}

#mobile-nav ul {
  list-style: none;
  padding: 10px 20px 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

#mobile-nav a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--jiuyi-radius-sm);
  color: var(--jiuyi-text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
  transition: background var(--jiuyi-transition), color var(--jiuyi-transition);
}

#mobile-nav a:hover {
  background: rgba(233, 69, 96, 0.1);
  color: var(--jiuyi-primary);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#main-content {
  max-width: var(--jiuyi-max-width);
  margin: 0 auto;
  padding: 0 20px 60px;
}

#breadcrumb {
  padding: 18px 0 8px;
}

#breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--jiuyi-text-muted);
}

#breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 6px;
  color: var(--jiuyi-text-muted);
}

#breadcrumb a {
  color: var(--jiuyi-text-secondary);
}

#breadcrumb a:hover {
  color: var(--jiuyi-primary);
}

#breadcrumb [aria-current="page"] {
  color: var(--jiuyi-primary);
  font-weight: 600;
}

section {
  margin-bottom: 56px;
  scroll-margin-top: 90px;
}

section > h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  position: relative;
  padding-left: 18px;
  letter-spacing: 0.02em;
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--jiuyi-primary), var(--jiuyi-primary-light));
  box-shadow: 0 0 12px rgba(233, 69, 96, 0.5);
}

section h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--jiuyi-text);
  letter-spacing: 0.01em;
}

section h4 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 20px 0 8px;
  color: var(--jiuyi-primary);
}

section p {
  margin-bottom: 14px;
  color: var(--jiuyi-text-secondary);
  line-height: 1.85;
}

section a {
  font-weight: 500;
}

#hero {
  position: relative;
  margin-top: 12px;
  padding: clamp(36px, 6vw, 72px) clamp(24px, 5vw, 60px);
  border-radius: var(--jiuyi-radius-xl);
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 35%, #0f3460 70%, #e94560 160%);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--jiuyi-shadow-lg);
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.45), transparent 70%);
  filter: blur(20px);
  z-index: -1;
  animation: floatOrb 9s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -80px;
  left: -40px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 52, 96, 0.7), transparent 70%);
  filter: blur(24px);
  z-index: -1;
  animation: floatOrb 11s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-18px, 22px) scale(1.08);
  }
}

#hero h1 {
  font-size: clamp(1.6rem, 4.4vw, 2.9rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, #ffffff 30%, #ffd6dd 70%, #e94560 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: fadeUp 0.8s ease both;
}

.hero-lead {
  font-size: clamp(0.98rem, 2vw, 1.12rem);
  color: rgba(255, 255, 255, 0.9) !important;
  max-width: 820px;
  margin-bottom: 14px !important;
  animation: fadeUp 0.8s ease 0.1s both;
}

.hero-sub {
  font-size: clamp(0.9rem, 1.8vw, 1rem);
  color: rgba(255, 255, 255, 0.72) !important;
  max-width: 820px;
  margin-bottom: 28px !important;
  animation: fadeUp 0.8s ease 0.2s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
  animation: fadeUp 0.8s ease 0.3s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform var(--jiuyi-transition), box-shadow var(--jiuyi-transition), background var(--jiuyi-transition), color var(--jiuyi-transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--jiuyi-primary), var(--jiuyi-primary-dark));
  color: #fff;
  box-shadow: var(--jiuyi-shadow-glow);
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 14px 40px rgba(233, 69, 96, 0.45);
  color: #fff;
}

.btn-primary:hover::after {
  transform: translateX(100%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: translateY(-3px);
  color: #fff;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  animation: fadeUp 0.8s ease 0.4s both;
}

.stat-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--jiuyi-radius-md);
  padding: 18px 14px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition), box-shadow var(--jiuyi-transition);
}

.stat-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.stat-number {
  display: inline-block;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.stat-unit {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--jiuyi-primary-light);
  margin-left: 2px;
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 6px;
  letter-spacing: 0.06em;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#banner-carousel {
  position: relative;
  margin-top: 24px;
  border-radius: var(--jiuyi-radius-lg);
  overflow: hidden;
  box-shadow: var(--jiuyi-shadow-md);
  background: var(--jiuyi-bg-card);
}

.carousel-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.carousel-slide {
  flex: 0 0 100%;
  min-width: 100%;
  padding: 0;
  overflow: hidden;
}

.carousel-slide svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
}

.carousel-controls {
  position: absolute;
  bottom: 14px;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  pointer-events: none;
}

.carousel-prev,
.carousel-next {
  pointer-events: auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(26, 26, 46, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition);
}

.carousel-prev:hover,
.carousel-next:hover {
  background: var(--jiuyi-primary);
  transform: scale(1.12);
}

.carousel-dots {
  display: flex;
  gap: 8px;
  pointer-events: auto;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  padding: 0;
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition), width var(--jiuyi-transition);
}

.carousel-dots button[aria-selected="true"] {
  background: var(--jiuyi-primary);
  width: 26px;
  border-radius: 999px;
  box-shadow: 0 0 12px rgba(233, 69, 96, 0.6);
}

.carousel-dots button:hover {
  transform: scale(1.25);
}

#brand-intro,
#products,
#solutions,
#applications,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#friend-links,
#legal {
  background: var(--jiuyi-bg-card);
  border-radius: var(--jiuyi-radius-lg);
  padding: clamp(24px, 4vw, 44px);
  box-shadow: var(--jiuyi-shadow-sm);
  border: 1px solid var(--jiuyi-border);
  transition: background var(--jiuyi-transition), border-color var(--jiuyi-transition), box-shadow var(--jiuyi-transition);
}

#brand-intro:hover,
#products:hover,
#solutions:hover,
#applications:hover,
#cases:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#friend-links:hover,
#legal:hover {
  box-shadow: var(--jiuyi-shadow-md);
}

.news-item,
.article-card {
  background: var(--jiuyi-bg-alt);
  border: 1px solid var(--jiuyi-border);
  border-radius: var(--jiuyi-radius-md);
  padding: 22px 24px;
  margin-bottom: 18px;
  transition: transform var(--jiuyi-transition), box-shadow var(--jiuyi-transition), border-color var(--jiuyi-transition), background var(--jiuyi-transition);
  position: relative;
  overflow: hidden;
}

.news-item::before,
.article-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--jiuyi-primary), var(--jiuyi-secondary-light));
  opacity: 0;
  transition: opacity var(--jiuyi-transition);
}

.news-item:hover,
.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--jiuyi-shadow-md);
  border-color: rgba(233, 69, 96, 0.35);
}

.news-item:hover::before,
.article-card:hover::before {
  opacity: 1;
}

.news-item h3,
.article-card h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  line-height: 1.5;
}

.news-item h3 a,
.article-card h3 a {
  color: var(--jiuyi-text);
  transition: color var(--jiuyi-transition);
}

.news-item h3 a:hover,
.article-card h3 a:hover {
  color: var(--jiuyi-primary);
}

.news-item time,
.article-card time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--jiuyi-text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  background: rgba(233, 69, 96, 0.08);
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.news-item p,
.article-card p {
  font-size: 0.92rem;
  color: var(--jiuyi-text-secondary);
  margin-bottom: 10px;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--jiuyi-primary);
  transition: gap var(--jiuyi-transition), color var(--jiuyi-transition);
}

.read-more:hover {
  gap: 10px;
  color: var(--jiuyi-primary-dark);
}

.faq-item {
  background: var(--jiuyi-bg-alt);
  border: 1px solid var(--jiuyi-border);
  border-radius: var(--jiuyi-radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--jiuyi-transition), border-color var(--jiuyi-transition), background var(--jiuyi-transition);
}

.faq-item[open] {
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--jiuyi-shadow-sm);
}

.faq-item summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--jiuyi-text);
  list-style: none;
  position: relative;
  padding-right: 52px;
  transition: color var(--jiuyi-transition), background var(--jiuyi-transition);
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(233, 69, 96, 0.1);
  color: var(--jiuyi-primary);
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition), color var(--jiuyi-transition);
}

.faq-item[open] summary::after {
  content: "−";
  background: var(--jiuyi-primary);
  color: #fff;
  transform: translateY(-50%) rotate(180deg);
}

.faq-item summary:hover {
  color: var(--jiuyi-primary);
  background: rgba(233, 69, 96, 0.04);
}

.faq-answer {
  padding: 0 22px 20px;
  animation: faqOpen 0.35s ease;
}

.faq-answer p {
  font-size: 0.92rem;
  color: var(--jiuyi-text-secondary);
  line-height: 1.85;
  margin: 0;
}

@keyframes faqOpen {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#sitemap nav ul,
#friend-links ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

#sitemap nav a,
#friend-links a {
  display: block;
  padding: 10px 16px;
  border-radius: var(--jiuyi-radius-sm);
  background: var(--jiuyi-bg-alt);
  border: 1px solid var(--jiuyi-border);
  color: var(--jiuyi-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform var(--jiuyi-transition), background var(--jiuyi-transition), color var(--jiuyi-transition), border-color var(--jiuyi-transition), box-shadow var(--jiuyi-transition);
}

#sitemap nav a:hover,
#friend-links a:hover {
  transform: translateY(-3px);
  background: linear-gradient(135deg, var(--jiuyi-primary), var(--jiuyi-primary-dark));
  color: #fff;
  border-color: transparent;
  box-shadow: var(--jiuyi-shadow-glow);
}

#contact p {
  font-size: 0.95rem;
}

#contact a {
  word-break: break-all;
}

#site-footer {
  background: linear-gradient(160deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
  color: rgba(255, 255, 255, 0.82);
  padding: 52px 20px 28px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.22), transparent 70%);
  filter: blur(30px);
  pointer-events: none;
}

.footer-inner {
  max-width: var(--jiuyi-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
  position: relative;
  z-index: 1;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 0.98rem;
  color: #fff;
  line-height: 1.5;
}

.footer-brand svg {
  flex-shrink: 0;
  border-radius: 8px;
}

#site-footer nav ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

#site-footer nav a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.88rem;
  transition: color var(--jiuyi-transition), padding-left var(--jiuyi-transition);
  display: inline-block;
}

#site-footer nav a:hover {
  color: var(--jiuyi-primary-light);
  padding-left: 5px;
}

.footer-contact p {
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.68);
  margin-bottom: 8px;
  line-height: 1.7;
}

.footer-copyright {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 22px;
  margin-top: 6px;
}

.footer-copyright p {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 6px;
  line-height: 1.7;
}

#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--jiuyi-primary), var(--jiuyi-primary-dark));
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--jiuyi-shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity var(--jiuyi-transition), visibility var(--jiuyi-transition), transform var(--jiuyi-transition), box-shadow var(--jiuyi-transition);
  z-index: 999;
}

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

#back-to-top:hover {
  transform: translateY(-5px) scale(1.08);
  box-shadow: 0 14px 40px rgba(233, 69, 96, 0.5);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.96);
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

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

@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 1024px) {
  #main-nav {
    display: none;
  }
  #menu-toggle {
    display: flex;
  }
  .search-form input[type="search"] {
    width: 120px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  .header-inner {
    padding: 10px 14px;
    gap: 10px;
  }
  .logo-text {
    font-size: 1.15rem;
  }
  #main-content {
    padding: 0 14px 48px;
  }
  section {
    margin-bottom: 40px;
    scroll-margin-top: 80px;
  }
  section > h2 {
    padding-left: 14px;
    margin-bottom: 18px;
  }
  #hero {
    padding: 32px 20px;
    border-radius: var(--jiuyi-radius-lg);
  }
  .hero-actions {
    flex-direction: column;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .stat-item {
    padding: 14px 10px;
  }
  .carousel-controls {
    bottom: 8px;
    gap: 10px;
  }
  .carousel-prev,
  .carousel-next {
    width: 32px;
    height: 32px;
    font-size: 1.1rem;
  }
  #brand-intro,
  #products,
  #solutions,
  #applications,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #friend-links,
  #legal {
    padding: 22px 18px;
    border-radius: var(--jiuyi-radius-md);
  }
  .news-item,
  .article-card {
    padding: 18px;
  }
  .faq-item summary {
    padding: 15px 16px;
    padding-right: 48px;
    font-size: 0.94rem;
  }
  .faq-answer {
    padding: 0 16px 16px;
  }
  #sitemap nav ul,
  #friend-links ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  #site-footer {
    padding: 40px 16px 24px;
  }
  .footer-inner {
    gap: 24px;
  }
  #site-footer nav ul {
    grid-template-columns: repeat(2, 1fr);
  }
  #back-to-top {
    right: 14px;
    bottom: 18px;
    width: 42px;
    height: 42px;
    font-size: 1.15rem;
  }
  .search-form {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-number {
    font-size: 1.35rem;
  }
  #sitemap nav ul,
  #friend-links ul {
    grid-template-columns: 1fr;
  }
  #mobile-nav ul {
    grid-template-columns: 1fr;
  }
  section h3 {
    font-size: 1.08rem;
  }
}

@media print {
  #site-header,
  #banner-carousel,
  #back-to-top,
  #site-footer,
  .hero-actions {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
  #hero {
    background: none;
    color: #000;
    box-shadow: none;
  }
  #hero h1 {
    -webkit-text-fill-color: #000;
    color: #000;
  }
  .hero-lead,
  .hero-sub {
    color: #333 !important;
  }
  section {
    box-shadow: none;
    border: none;
    page-break-inside: avoid;
  }
}