:root {
  --brand-primary: #e63946;
  --brand-secondary: #2a9d8f;
  --brand-dark: #264653;
  --brand-accent: #f4a261;
  --brand-light: #f1faee;
  --bg-body: #f7f8fa;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --text-primary: #1d2433;
  --text-secondary: #4a5568;
  --text-muted: #7b8794;
  --shadow-sm: 0 2px 8px rgba(29, 36, 51, 0.06);
  --shadow-md: 0 8px 24px rgba(29, 36, 51, 0.1);
  --shadow-lg: 0 16px 48px rgba(29, 36, 51, 0.14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --gradient-hero: linear-gradient(135deg, #e63946 0%, #f4a261 50%, #2a9d8f 100%);
  --gradient-brand: linear-gradient(135deg, #e63946, #c1121f);
  --gradient-teal: linear-gradient(135deg, #2a9d8f, #1d7a6f);
  --gradient-dark: linear-gradient(135deg, #264653, #1a3038);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.25));
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
  --max-width: 1200px;
  --header-height: 72px;
}

[data-theme="dark"] {
  --bg-body: #0f1419;
  --bg-card: #1a2129;
  --bg-glass: rgba(26, 33, 41, 0.78);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text-primary: #e8edf2;
  --text-secondary: #a8b4c0;
  --text-muted: #6b7885;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --gradient-glass: linear-gradient(135deg, rgba(40, 50, 62, 0.7), rgba(26, 33, 41, 0.4));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

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

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

a:hover {
  color: var(--brand-secondary);
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition-base);
}

h1 { font-size: clamp(1.6rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.4rem); }
h4 { font-size: clamp(1rem, 1.8vw, 1.15rem); }

p {
  color: var(--text-secondary);
  margin-bottom: 1em;
}

time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5em;
}

blockquote {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-glass-border);
  border-left: 4px solid var(--brand-primary);
  border-radius: var(--radius-md);
  padding: 1.5em 1.8em;
  margin: 1.5em 0;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 0.8em;
}

blockquote footer {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: normal;
}

blockquote footer::before {
  content: "— ";
}

details {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  margin-bottom: 1em;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

details:hover {
  box-shadow: var(--shadow-md);
}

details[open] {
  box-shadow: var(--shadow-md);
}

details summary {
  padding: 1.1em 1.4em;
  font-weight: 600;
  font-size: 1.02rem;
  cursor: pointer;
  color: var(--text-primary);
  position: relative;
  list-style: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: "+";
  position: absolute;
  right: 1.4em;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--brand-primary);
  transition: transform var(--transition-base);
}

details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

details summary:hover {
  background: rgba(230, 57, 70, 0.06);
}

details > p,
details > div {
  padding: 0 1.4em 1.2em;
  animation: fadeSlideIn var(--transition-slow) both;
}

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

address {
  font-style: normal;
}

::selection {
  background: var(--brand-primary);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 10px;
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.logo:hover {
  transform: scale(1.04);
}

.logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 6px rgba(230, 57, 70, 0.3));
  transition: filter var(--transition-base), transform var(--transition-base);
}

.logo:hover svg {
  filter: drop-shadow(0 4px 12px rgba(230, 57, 70, 0.5));
  transform: rotate(-8deg);
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}

#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
}

#main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

#main-nav a:hover {
  color: var(--brand-primary);
  background: rgba(230, 57, 70, 0.08);
  transform: translateY(-2px);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

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

.site-search:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
}

.site-search input {
  border: none;
  outline: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--text-primary);
  width: 160px;
  font-family: inherit;
  transition: width var(--transition-base);
}

.site-search input::placeholder {
  color: var(--text-muted);
}

.site-search input:focus {
  width: 200px;
}

.site-search button {
  border: none;
  background: var(--gradient-brand);
  color: #fff;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

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

.site-search button:active {
  transform: scale(0.97);
}

#theme-toggle,
#menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--bg-glass-border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1.15rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

#theme-toggle:hover,
#menu-toggle:hover {
  transform: rotate(15deg) scale(1.1);
  background: var(--brand-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.4);
}

#menu-toggle {
  display: none;
}

.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px 0;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
}

.breadcrumb li {
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 6px;
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb a {
  color: var(--brand-primary);
  font-weight: 500;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

main > section {
  margin-top: 48px;
  animation: sectionReveal var(--transition-slow) both;
}

@keyframes sectionReveal {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > section > h2 {
  position: relative;
  padding-left: 20px;
  margin-bottom: 1.2em;
}

main > section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 80%;
  background: var(--gradient-brand);
  border-radius: 6px;
}

main > section > h3 {
  margin-top: 1.6em;
  margin-bottom: 0.6em;
  color: var(--brand-primary);
}

.hero {
  position: relative;
  margin-top: 32px;
  padding: 48px 40px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: gradientShift 12s ease infinite;
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatBlob 8s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatBlob 10s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero h1 {
  position: relative;
  z-index: 1;
  color: #fff;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
  margin-bottom: 0.5em;
}

.hero-summary {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.02rem;
  max-width: 820px;
  line-height: 1.85;
  margin-bottom: 2em;
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 2.5em;
}

.stat-item {
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-6px) scale(1.03);
  background: rgba(255, 255, 255, 0.26);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.stat-number {
  display: block;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.stat-label {
  display: block;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 4px;
}

.hero-banner {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  background: rgba(0, 0, 0, 0.1);
}

.banner-slide {
  display: none;
  animation: bannerFade var(--transition-slow) both;
}

.banner-slide.active {
  display: block;
}

@keyframes bannerFade {
  from { opacity: 0; transform: scale(1.02); }
  to { opacity: 1; transform: scale(1); }
}

.banner-slide svg {
  width: 100%;
  height: auto;
  display: block;
}

.anchor-nav {
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.anchor-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.anchor-nav a {
  display: inline-block;
  padding: 7px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: 999px;
  transition: all var(--transition-fast);
}

.anchor-nav a:hover {
  color: #fff;
  background: var(--gradient-brand);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(230, 57, 70, 0.35);
}

#brand-intro,
#history,
#culture,
#products,
#advantages,
#solutions,
#industry,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#friend-links {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base);
}

#brand-intro:hover,
#history:hover,
#culture:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#industry:hover,
#cases:hover,
#reviews:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#friend-links:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

#news article,
#articles article {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-bottom: 18px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-brand);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform var(--transition-base);
}

#news article:hover,
#articles article:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(230, 57, 70, 0.3);
}

#news article:hover::before,
#articles article:hover::before {
  transform: scaleY(1);
}

#news article h3,
#articles article h3 {
  margin-bottom: 0.3em;
  transition: color var(--transition-fast);
}

#news article:hover h3,
#articles article:hover h3 {
  color: var(--brand-primary);
}

#news article a,
#articles article a {
  display: inline-block;
  margin-top: 0.6em;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(230, 57, 70, 0.1);
  color: var(--brand-primary);
  transition: all var(--transition-fast);
}

#news article a:hover,
#articles article a:hover {
  background: var(--gradient-brand);
  color: #fff;
  transform: translateX(4px);
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.35);
}

#howto ol {
  counter-reset: step-counter;
  padding-left: 0;
}

#howto ol > li {
  counter-increment: step-counter;
  position: relative;
  padding: 20px 24px 20px 68px;
  margin-bottom: 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#howto ol > li::before {
  content: counter(step-counter);
  position: absolute;
  left: 20px;
  top: 20px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.35);
  transition: transform var(--transition-base);
}

#howto ol > li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#howto ol > li:hover::before {
  transform: scale(1.15) rotate(360deg);
}

#howto ol > li h4 {
  margin-bottom: 0.4em;
  color: var(--brand-primary);
}

#howto ul {
  padding-left: 0;
}

#howto ul li {
  position: relative;
  padding: 8px 0 8px 28px;
  color: var(--text-secondary);
}

#howto ul li::before {
  content: "◆";
  position: absolute;
  left: 0;
  top: 8px;
  color: var(--brand-secondary);
  font-size: 0.75rem;
}

#contact address {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 1.5em;
}

#contact address p {
  margin-bottom: 0.6em;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#contact address a {
  font-weight: 600;
  position: relative;
}

#contact address a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  transition: width var(--transition-base);
}

#contact address a:hover::after {
  width: 100%;
}

#contact ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 1em;
}

#contact ul li {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#contact ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

#sitemap nav ul,
#friend-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap nav a,
#friend-links a {
  display: inline-block;
  padding: 8px 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#sitemap nav a:hover,
#friend-links a:hover {
  color: #fff;
  background: var(--gradient-teal);
  border-color: transparent;
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 6px 18px rgba(42, 157, 143, 0.35);
}

footer[role="contentinfo"] {
  background: var(--gradient-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: 56px 24px 0;
  margin-top: 64px;
  position: relative;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(230, 57, 70, 0.2), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

footer[role="contentinfo"] > section {
  max-width: var(--max-width);
  margin: 0 auto 32px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: background var(--transition-base), transform var(--transition-base);
}

footer[role="contentinfo"] > section:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}

footer[role="contentinfo"] h2 {
  color: #fff;
  font-size: 1.15rem;
  margin-bottom: 0.8em;
  position: relative;
  padding-left: 16px;
}

footer[role="contentinfo"] h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  background: var(--brand-primary);
  border-radius: 4px;
}

footer[role="contentinfo"] p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
  margin-bottom: 0.6em;
}

footer[role="contentinfo"] a {
  color: var(--brand-accent);
  font-weight: 500;
}

footer[role="contentinfo"] a:hover {
  color: #fff;
  text-decoration: underline;
}

footer[role="contentinfo"] address p {
  margin-bottom: 0.4em;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.4em;
}

.footer-bottom p:first-child {
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
}

#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

#back-to-top:hover {
  transform: translateY(-6px) scale(1.1);
  box-shadow: 0 12px 32px rgba(230, 57, 70, 0.6);
}

#back-to-top:active {
  transform: translateY(-2px) scale(1.02);
}

@media (max-width: 1024px) {
  .header-inner {
    padding: 0 16px;
  }

  #main-nav a {
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  .site-search input {
    width: 120px;
  }

  .site-search input:focus {
    width: 150px;
  }

  .hero {
    padding: 36px 28px;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  #main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--bg-glass-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-base);
    box-shadow: var(--shadow-md);
  }

  #main-nav.open {
    max-height: 80vh;
    overflow-y: auto;
    padding: 16px 0;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding: 0 16px;
  }

  #main-nav a {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  #main-nav a::after {
    display: none;
  }

  #menu-toggle {
    display: flex;
  }

  .site-search input {
    width: 100px;
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  .site-search input:focus {
    width: 120px;
  }

  .site-search button {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .breadcrumb {
    padding: 12px 16px 0;
  }

  main {
    padding: 0 16px 40px;
  }

  main > section {
    margin-top: 32px;
  }

  #brand-intro,
  #history,
  #culture,
  #products,
  #advantages,
  #solutions,
  #industry,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #friend-links {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  .hero {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .hero-summary {
    font-size: 0.95rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-item {
    padding: 14px 10px;
  }

  .anchor-nav {
    padding: 12px 14px;
  }

  .anchor-nav a {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  blockquote {
    padding: 1.2em 1.3em;
  }

  details summary {
    padding: 1em 1.2em;
    font-size: 0.95rem;
  }

  details summary::after {
    right: 1.2em;
  }

  details > p,
  details > div {
    padding: 0 1.2em 1em;
  }

  #howto ol > li {
    padding: 16px 18px 16px 58px;
  }

  #howto ol > li::before {
    left: 14px;
    top: 16px;
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  #contact address {
    padding: 18px 20px;
  }

  #contact ul {
    grid-template-columns: 1fr;
  }

  footer[role="contentinfo"] {
    padding: 40px 16px 0;
    margin-top: 48px;
  }

  footer[role="contentinfo"] > section {
    padding: 20px 18px;
  }

  .footer-bottom {
    padding: 20px 0 28px;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
    font-size: 1.15rem;
  }
}

@media (max-width: 480px) {
  .header-inner {
    gap: 8px;
  }

  .logo-text {
    font-size: 1.1rem;
  }

  .logo svg {
    width: 30px;
    height: 30px;
  }

  .site-search {
    display: none;
  }

  .hero {
    padding: 24px 16px;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat-number {
    font-size: 1.4rem;
  }

  .stat-label {
    font-size: 0.75rem;
  }

  .anchor-nav ul {
    gap: 6px;
  }

  #news article,
  #articles article {
    padding: 16px 18px;
  }

  #news article:hover,
  #articles article:hover {
    transform: translateY(-3px);
  }
}

@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;
  }
}

@media print {
  #site-header,
  #back-to-top,
  .anchor-nav,
  .hero-banner,
  .site-search,
  #theme-toggle,
  #menu-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }
}