:root {
  --brand: #c0392b;
  --brand-dark: #7b241c;
  --brand-light: #e74c3c;
  --brand-soft: #fdf2f0;
  --accent: #e8b4ae;
  --accent-warm: #d98880;
  --bg: #faf7f5;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #2c1810;
  --text-secondary: #6b4c42;
  --text-muted: #9b7b72;
  --border: rgba(192, 57, 43, 0.12);
  --border-strong: rgba(192, 57, 43, 0.22);
  --shadow-sm: 0 2px 8px rgba(123, 36, 28, 0.06);
  --shadow-md: 0 8px 24px rgba(123, 36, 28, 0.10);
  --shadow-lg: 0 16px 48px rgba(123, 36, 28, 0.14);
  --shadow-glow: 0 0 0 3px rgba(192, 57, 43, 0.15);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --header-h: 68px;
  --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);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --gradient-brand: linear-gradient(135deg, #c0392b 0%, #e74c3c 40%, #d98880 100%);
  --gradient-soft: linear-gradient(135deg, #fdf2f0 0%, #fce4e0 50%, #f8d7d0 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.55) 100%);
  --gradient-dark: linear-gradient(135deg, #1a0f0c 0%, #2c1810 50%, #3d1f18 100%);
}

[data-theme="dark"] {
  --brand: #e74c3c;
  --brand-dark: #ff6b5b;
  --brand-light: #ff8a7a;
  --brand-soft: #2a1512;
  --accent: #8b3a30;
  --accent-warm: #a04a3e;
  --bg: #120a08;
  --bg-alt: #1a0f0c;
  --surface: rgba(42, 21, 18, 0.72);
  --surface-solid: #241410;
  --text: #f5e6e2;
  --text-secondary: #c9a89f;
  --text-muted: #8b6b62;
  --border: rgba(231, 76, 60, 0.15);
  --border-strong: rgba(231, 76, 60, 0.3);
  --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);
  --shadow-glow: 0 0 0 3px rgba(231, 76, 60, 0.25);
  --gradient-brand: linear-gradient(135deg, #e74c3c 0%, #ff6b5b 40%, #a04a3e 100%);
  --gradient-soft: linear-gradient(135deg, #2a1512 0%, #1f0f0c 50%, #1a0a08 100%);
  --gradient-glass: linear-gradient(135deg, rgba(42,21,18,0.85) 0%, rgba(42,21,18,0.55) 100%);
  --gradient-dark: linear-gradient(135deg, #0d0605 0%, #120a08 50%, #1a0f0c 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --brand: #e74c3c;
    --brand-dark: #ff6b5b;
    --brand-light: #ff8a7a;
    --brand-soft: #2a1512;
    --accent: #8b3a30;
    --accent-warm: #a04a3e;
    --bg: #120a08;
    --bg-alt: #1a0f0c;
    --surface: rgba(42, 21, 18, 0.72);
    --surface-solid: #241410;
    --text: #f5e6e2;
    --text-secondary: #c9a89f;
    --text-muted: #8b6b62;
    --border: rgba(231, 76, 60, 0.15);
    --border-strong: rgba(231, 76, 60, 0.3);
    --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);
    --shadow-glow: 0 0 0 3px rgba(231, 76, 60, 0.25);
    --gradient-brand: linear-gradient(135deg, #e74c3c 0%, #ff6b5b 40%, #a04a3e 100%);
    --gradient-soft: linear-gradient(135deg, #2a1512 0%, #1f0f0c 50%, #1a0a08 100%);
    --gradient-glass: linear-gradient(135deg, rgba(42,21,18,0.85) 0%, rgba(42,21,18,0.55) 100%);
    --gradient-dark: linear-gradient(135deg, #0d0605 0%, #120a08 50%, #1a0f0c 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

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

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul,
ol {
  list-style: none;
}

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

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

#site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-brand);
  opacity: 0.06;
  pointer-events: none;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--brand-dark);
  letter-spacing: -0.02em;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.brand:hover {
  transform: scale(1.03);
  color: var(--brand);
}

.brand svg {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 2px 6px rgba(192, 57, 43, 0.3));
  transition: transform var(--transition-base);
}

.brand:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

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

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

#main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: calc(100% - 28px);
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

#main-nav a:hover {
  color: var(--brand);
  background: var(--brand-soft);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

#site-search {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  flex-shrink: 0;
}

#site-search:focus-within {
  border-color: var(--brand);
  box-shadow: var(--shadow-glow);
}

#site-search input {
  border: none;
  background: transparent;
  padding: 9px 16px;
  font-size: 0.875rem;
  color: var(--text);
  width: 180px;
  outline: none;
  font-family: inherit;
}

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

#site-search button {
  border: none;
  background: var(--gradient-brand);
  color: #fff;
  padding: 9px 18px;
  font-size: 0.875rem;
  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(1.02);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--brand);
  border-color: var(--brand);
  background: var(--brand-soft);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
}

nav[aria-label="面包屑导航"] {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px 0;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--text-muted);
  font-weight: 700;
}

nav[aria-label="面包屑导航"] a {
  color: var(--text-secondary);
  font-weight: 500;
}

nav[aria-label="面包屑导航"] a:hover {
  color: var(--brand);
}

nav[aria-label="面包屑导航"] [aria-current="page"] {
  color: var(--brand);
  font-weight: 700;
}

main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

main > section {
  margin-bottom: 48px;
  opacity: 0;
  transform: translateY(32px);
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

main > section:nth-child(1) { animation-delay: 0.05s; }
main > section:nth-child(2) { animation-delay: 0.1s; }
main > section:nth-child(3) { animation-delay: 0.15s; }
main > section:nth-child(4) { animation-delay: 0.2s; }
main > section:nth-child(5) { animation-delay: 0.25s; }
main > section:nth-child(6) { animation-delay: 0.3s; }
main > section:nth-child(7) { animation-delay: 0.35s; }
main > section:nth-child(8) { animation-delay: 0.4s; }
main > section:nth-child(9) { animation-delay: 0.45s; }
main > section:nth-child(10) { animation-delay: 0.5s; }
main > section:nth-child(11) { animation-delay: 0.55s; }
main > section:nth-child(12) { animation-delay: 0.6s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

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

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(192, 57, 43, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(192, 57, 43, 0); }
}

#intro {
  position: relative;
  background: var(--gradient-brand);
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-top: 8px;
}

#intro::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#intro::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#intro h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

#intro p {
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 16px;
  opacity: 0.95;
  position: relative;
  z-index: 1;
  max-width: 900px;
}

#intro figure {
  margin-top: 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 16px;
  position: relative;
  z-index: 1;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

#intro figure:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 24px 60px rgba(0,0,0,0.25);
}

#intro figure svg {
  border-radius: var(--radius-md);
  width: 100%;
}

#intro figcaption {
  margin-top: 12px;
  font-size: 0.85rem;
  text-align: center;
  opacity: 0.85;
  font-style: italic;
}

#brand,
#products,
#solutions,
#cases,
#news,
#howto,
#faq,
#contact,
#sitemap,
#links {
  background: var(--surface);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

#brand:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#howto:hover,
#faq:hover,
#contact:hover,
#sitemap:hover,
#links:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

main > section h2 {
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 800;
  color: var(--brand-dark);
  margin-bottom: 24px;
  padding-bottom: 14px;
  position: relative;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

main > section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

main > section:hover h2::after {
  width: 96px;
}

main > section h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin: 28px 0 12px;
  padding-left: 14px;
  border-left: 4px solid var(--brand);
  line-height: 1.5;
  transition: border-color var(--transition-fast), padding-left var(--transition-fast);
}

main > section h3:hover {
  border-left-color: var(--brand-light);
  padding-left: 18px;
}

main > section h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--brand-dark);
  margin: 20px 0 8px;
  display: inline-block;
  padding: 4px 12px;
  background: var(--brand-soft);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

main > section h4:hover {
  background: var(--accent);
  transform: translateX(4px);
}

main > section p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.9;
  font-size: 0.95rem;
}

#products h3,
#solutions h3,
#cases h3 {
  margin-top: 32px;
}

#products h4 {
  margin-top: 20px;
}

#cases blockquote {
  background: var(--gradient-soft);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 16px 0;
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  top: -8px;
  left: 12px;
  font-size: 3rem;
  color: var(--brand);
  opacity: 0.25;
  font-family: Georgia, serif;
  line-height: 1;
}

#cases blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}

#cases blockquote p {
  color: var(--text);
  font-style: italic;
  margin: 0;
  position: relative;
  z-index: 1;
}

#news article {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#news article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-brand);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-base);
  border-radius: var(--radius-full);
}

#news article:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

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

#news article h3 {
  margin: 0 0 8px;
  padding-left: 0;
  border-left: none;
  font-size: 1.05rem;
  color: var(--brand-dark);
  transition: color var(--transition-fast);
}

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

#news article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#news article p:nth-of-type(2) {
  font-size: 0.9rem;
  margin-bottom: 12px;
}

#news article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--brand);
  padding: 6px 16px;
  border: 2px solid var(--brand);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

#news article a::after {
  content: "→";
  transition: transform var(--transition-fast);
}

#news article a:hover {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

#news article a:hover::after {
  transform: translateX(4px);
}

#howto ol {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 16px 20px 16px 64px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(192, 57, 43, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.15) rotate(-8deg);
  box-shadow: 0 6px 20px rgba(192, 57, 43, 0.45);
}

#faq details {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

#faq details:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

#faq details[open] {
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}

#faq summary {
  padding: 18px 24px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 50%;
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

#faq details[open] summary {
  background: var(--brand-soft);
  color: var(--brand-dark);
}

#faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
  background: var(--gradient-brand);
  color: #fff;
}

#faq summary:hover {
  background: var(--brand-soft);
}

#faq details p {
  padding: 0 24px 20px;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--text-secondary);
  animation: fadeInUp 0.35s ease forwards;
}

#contact p {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

#contact h3 {
  margin-top: 24px;
}

#contact p:has(+ p) {
  margin-bottom: 4px;
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

#sitemap li a,
#links li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#sitemap li a::before,
#links li a::before {
  content: "◆";
  font-size: 0.6rem;
  color: var(--brand);
  transition: transform var(--transition-fast);
}

#sitemap li a:hover,
#links li a:hover {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

#sitemap li a:hover::before,
#links li a:hover::before {
  color: #fff;
  transform: rotate(90deg);
}

footer {
  background: var(--gradient-dark);
  color: #e8d5d0;
  padding: 56px 24px 32px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-brand);
}

footer > section {
  max-width: 1280px;
  margin: 0 auto 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

footer > section:last-of-type {
  border-bottom: none;
}

footer h2 {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

footer h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
}

footer h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  margin: 16px 0 8px;
}

footer p {
  font-size: 0.875rem;
  line-height: 1.9;
  color: rgba(232, 213, 208, 0.75);
  margin-bottom: 8px;
}

footer > p {
  max-width: 1280px;
  margin: 24px auto 0;
  text-align: center;
  font-size: 0.8rem;
  color: rgba(232, 213, 208, 0.5);
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.1;
  padding: 6px;
  font-family: inherit;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  animation: pulseGlow 2.5s ease-in-out infinite;
}

#back-to-top::before {
  content: "↑";
  position: absolute;
  top: -2px;
  font-size: 1rem;
  font-weight: 900;
}

#back-to-top:hover {
  transform: translateY(-6px) scale(1.1);
  box-shadow: 0 12px 32px rgba(192, 57, 43, 0.5);
  animation: none;
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

@media (max-width: 1024px) {
  .header-inner {
    padding: 0 18px;
    gap: 12px;
  }

  #main-nav a {
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  #site-search input {
    width: 130px;
  }

  #intro {
    padding: 44px 32px;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links {
    padding: 32px 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 60px;
  }

  .header-inner {
    padding: 0 14px;
    gap: 8px;
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-h);
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .brand {
    font-size: 1.05rem;
  }

  .brand svg {
    width: 32px;
    height: 32px;
  }

  #main-nav {
    order: 10;
    flex-basis: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }

  #main-nav::-webkit-scrollbar {
    display: none;
  }

  #main-nav ul {
    gap: 2px;
  }

  #main-nav a {
    padding: 6px 12px;
    font-size: 0.8rem;
    white-space: nowrap;
  }

  #site-search {
    flex: 1;
    min-width: 0;
  }

  #site-search input {
    width: 100%;
    min-width: 0;
    padding: 8px 12px;
    font-size: 0.82rem;
  }

  #site-search button {
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 10px;
    font-size: 0.72rem;
  }

  #menu-toggle {
    display: block;
  }

  nav[aria-label="面包屑导航"] {
    padding: 12px 14px 0;
  }

  main {
    padding: 16px 14px 48px;
  }

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

  #intro {
    padding: 32px 20px;
    border-radius: var(--radius-lg);
  }

  #intro h1 {
    font-size: 1.5rem;
  }

  #intro p {
    font-size: 0.9rem;
  }

  #intro figure {
    padding: 10px;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #howto,
  #faq,
  #contact,
  #sitemap,
  #links {
    padding: 24px 18px;
    border-radius: var(--radius-lg);
  }

  main > section h2 {
    font-size: 1.25rem;
  }

  main > section h3 {
    font-size: 1.05rem;
  }

  #news article {
    padding: 18px 20px;
  }

  #news article:hover {
    transform: translateX(4px);
  }

  #howto ol li {
    padding: 14px 16px 14px 56px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
    left: 14px;
  }

  #faq summary {
    padding: 14px 18px;
    font-size: 0.88rem;
  }

  #faq details p {
    padding: 0 18px 16px;
    font-size: 0.85rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
  }

  #sitemap li a,
  #links li a {
    padding: 10px 14px;
    font-size: 0.82rem;
  }

  footer {
    padding: 40px 18px 24px;
  }

  #back-to-top {
    width: 42px;
    height: 42px;
    bottom: 20px;
    right: 20px;
    font-size: 0.62rem;
  }
}

@media (max-width: 480px) {
  #intro h1 {
    font-size: 1.3rem;
  }

  main > section h2 {
    font-size: 1.15rem;
  }

  #site-search button {
    padding: 8px 10px;
  }

  #theme-toggle {
    display: none;
  }

  #cases blockquote {
    padding: 16px 18px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
  }
}

@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;
  }

  main > section {
    opacity: 1;
    transform: none;
  }
}

@media print {
  #site-header,
  #back-to-top,
  #theme-toggle,
  #menu-toggle,
  #site-search {
    display: none;
  }

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

  main > section {
    opacity: 1;
    transform: none;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}