:root {
  --primary: #8B5E3C;
  --primary-light: #A9744F;
  --primary-dark: #6B3F1D;
  --accent: #C4956A;
  --bg: #FAF6F1;
  --bg-alt: #F5E6D3;
  --surface: #FFFFFF;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-border: rgba(139, 94, 60, 0.18);
  --text: #2C1E12;
  --text-secondary: #5C4A38;
  --text-muted: #8A7562;
  --border: rgba(139, 94, 60, 0.16);
  --shadow-sm: 0 2px 8px rgba(107, 63, 29, 0.08);
  --shadow-md: 0 8px 24px rgba(107, 63, 29, 0.12);
  --shadow-lg: 0 16px 48px rgba(107, 63, 29, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #8B5E3C 0%, #A9744F 40%, #C4956A 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(245,230,211,0.6));
  --gradient-accent: linear-gradient(90deg, #8B5E3C, #C4956A);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", Georgia, serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --header-h: 72px;
}

[data-theme="dark"] {
  --primary: #C4956A;
  --primary-light: #D4A87A;
  --primary-dark: #A9744F;
  --accent: #E0B88A;
  --bg: #1A1410;
  --bg-alt: #241C15;
  --surface: #2A2119;
  --surface-glass: rgba(42, 33, 25, 0.78);
  --surface-glass-border: rgba(196, 149, 106, 0.22);
  --text: #F0E6DA;
  --text-secondary: #C8B8A6;
  --text-muted: #9A8875;
  --border: rgba(196, 149, 106, 0.16);
  --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-hero: linear-gradient(135deg, #2A2119 0%, #3D2E20 40%, #5C4430 100%);
  --gradient-card: linear-gradient(145deg, rgba(42,33,25,0.9), rgba(36,28,21,0.6));
  --gradient-accent: linear-gradient(90deg, #C4956A, #E0B88A);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 15% 20%, rgba(139, 94, 60, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(196, 149, 106, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
  min-height: 100vh;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 15% 20%, rgba(196, 149, 106, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(224, 184, 138, 0.04) 0%, transparent 50%);
}

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

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

a:hover {
  color: var(--primary-dark);
  opacity: 0.85;
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 5px;
  border: 2px solid var(--bg-alt);
}

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

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

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

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo svg {
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

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

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

#site-header 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), background var(--transition);
}

#site-header nav a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

#site-header nav a:hover {
  color: var(--primary);
  background: rgba(139, 94, 60, 0.06);
  opacity: 1;
}

#site-header nav a:hover::after {
  transform: scaleX(1);
}

#site-header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

#site-header form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#site-header input[type="search"] {
  width: 180px;
  padding: 9px 14px;
  font-size: 0.88rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  outline: none;
  transition: width var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#site-header input[type="search"]::placeholder {
  color: var(--text-muted);
}

#site-header input[type="search"]:focus {
  width: 220px;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(139, 94, 60, 0.12);
}

#site-header form[role="search"] button {
  padding: 9px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
}

#site-header form[role="search"] button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(139, 94, 60, 0.3);
}

#site-header form[role="search"] button:active {
  transform: translateY(0);
}

#theme-toggle {
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(139, 94, 60, 0.08);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

#theme-toggle:hover {
  background: rgba(139, 94, 60, 0.16);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

#menu-toggle {
  display: none;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(139, 94, 60, 0.3);
}

main {
  display: block;
  overflow-x: hidden;
}

main > section,
main > nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 64px 24px;
  position: relative;
}

main > section {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

main > section:nth-of-type(even) {
  background: var(--bg-alt);
  border-radius: var(--radius-xl);
  margin-top: 8px;
  margin-bottom: 8px;
}

#hero {
  max-width: 100%;
  padding: 80px 24px 72px;
  background: var(--gradient-hero);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  color: #fff;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.08) 0%, transparent 45%),
    repeating-linear-gradient(45deg, transparent, transparent 40px, rgba(255,255,255,0.02) 40px, rgba(255,255,255,0.02) 42px);
  z-index: -1;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  border: 2px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  z-index: -1;
  animation: float 12s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-20px, -20px) scale(1.05); }
}

#hero > * {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
}

#hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.02em;
  text-align: center;
  margin-bottom: 24px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
  animation: fadeInUp 0.8s var(--transition-slow) both;
}

#hero > p {
  max-width: 900px;
  margin: 0 auto 40px;
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  line-height: 1.9;
  text-align: center;
  color: rgba(255, 255, 255, 0.92);
  animation: fadeInUp 0.8s 0.15s var(--transition-slow) both;
}

#hero figure {
  max-width: 860px;
  margin: 0 auto 48px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.8s 0.3s var(--transition-slow) both;
  transition: transform var(--transition);
}

#hero figure:hover {
  transform: translateY(-6px) scale(1.01);
}

#hero figure svg {
  width: 100%;
  height: auto;
  display: block;
}

#hero figcaption {
  padding: 16px 24px;
  font-size: 0.88rem;
  text-align: center;
  color: var(--text-secondary);
  background: rgba(245, 230, 211, 0.6);
  border-top: 1px solid var(--border);
}

.hero-banner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
  animation: fadeInUp 0.8s 0.45s var(--transition-slow) both;
}

.hero-banner article {
  padding: 28px 24px;
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.hero-banner article:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.22);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.2);
}

.hero-banner article h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.hero-banner article p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
}

#hero ul[aria-label="平台数据"] {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  animation: fadeInUp 0.8s 0.6s var(--transition-slow) both;
}

#hero ul[aria-label="平台数据"] li {
  text-align: center;
  padding: 24px 16px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.85);
  transition: transform var(--transition), background var(--transition);
}

#hero ul[aria-label="平台数据"] li:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.18);
}

#hero ul[aria-label="平台数据"] strong {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 6px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main > nav[aria-label="面包屑导航"] {
  padding: 20px 24px 0;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] li {
  display: flex;
  align-items: center;
  gap: 8px;
}

main > nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.5;
}

main > nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--text-secondary);
  font-weight: 600;
}

main > nav[aria-label="页内锚点导航"] {
  padding: 16px 24px;
}

main > nav[aria-label="页内锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 20px;
  background: var(--surface-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

main > nav[aria-label="页内锚点导航"] a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(139, 94, 60, 0.06);
  border-radius: 999px;
  transition: all var(--transition);
}

main > nav[aria-label="页内锚点导航"] a:hover {
  color: #fff;
  background: var(--gradient-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 94, 60, 0.25);
  opacity: 1;
}

main > section h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 28px;
  padding-bottom: 16px;
  position: relative;
  letter-spacing: 0.02em;
}

main > section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

main > section h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 700;
  color: var(--text);
  margin: 36px 0 16px;
  padding-left: 16px;
  position: relative;
  letter-spacing: 0.01em;
}

main > section h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25em;
  bottom: 0.25em;
  width: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

main > section p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

main > section ul,
main > section ol {
  margin: 20px 0 24px;
  padding-left: 0;
}

main > section ul li,
main > section ol li {
  position: relative;
  padding: 10px 0 10px 32px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: padding-left var(--transition), color var(--transition);
}

main > section ul li:last-child,
main > section ol li:last-child {
  border-bottom: none;
}

main > section ul li:hover,
main > section ol li:hover {
  padding-left: 40px;
  color: var(--text);
}

main > section ul li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 1.15em;
  width: 8px;
  height: 8px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: rotate(45deg);
  transition: transform var(--transition);
}

main > section ul li:hover::before {
  transform: rotate(45deg) scale(1.3);
}

main > section ol {
  counter-reset: item;
}

main > section ol li {
  counter-increment: item;
  padding-left: 44px;
}

main > section ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 12px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(139, 94, 60, 0.25);
}

main > section strong {
  color: var(--text);
  font-weight: 700;
}

#about,
#history,
#culture,
#products,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links,
#legal,
#author-info {
  animation: fadeInUp 0.7s var(--transition-slow) both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

@supports not (animation-timeline: view()) {
  #about,
  #history,
  #culture,
  #products,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links,
  #legal,
  #author-info {
    animation: none;
  }
}

#news article,
#articles article {
  padding: 28px;
  margin-bottom: 20px;
  background: var(--gradient-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

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

#news article:hover,
#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

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

#news article h3,
#articles article h3 {
  margin: 0 0 10px;
  padding-left: 0;
  font-size: 1.15rem;
}

#news article h3::before,
#articles article h3::before {
  display: none;
}

#news time,
#articles time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 3px 12px;
  background: rgba(139, 94, 60, 0.08);
  border-radius: 999px;
}

#news article p,
#articles article p {
  font-size: 0.95rem;
  line-height: 1.85;
  margin-bottom: 14px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  padding: 8px 18px;
  background: rgba(139, 94, 60, 0.08);
  border-radius: 999px;
  transition: all var(--transition);
}

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

#articles article a:hover {
  color: #fff;
  background: var(--gradient-accent);
  transform: translateX(4px);
  box-shadow: 0 4px 14px rgba(139, 94, 60, 0.3);
  opacity: 1;
}

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

#reviews blockquote {
  padding: 28px 32px;
  margin-bottom: 20px;
  background: var(--gradient-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

#reviews blockquote::before {
  content: "\201C";
  position: absolute;
  top: 8px;
  left: 20px;
  font-family: var(--font-serif);
  font-size: 4rem;
  line-height: 1;
  color: var(--primary-light);
  opacity: 0.25;
  pointer-events: none;
}

#reviews blockquote:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

#reviews blockquote p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-style: italic;
}

#reviews blockquote footer {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  text-align: right;
}

#faq details {
  margin-bottom: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

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

#faq details:hover {
  border-color: var(--primary-light);
}

#faq summary {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background var(--transition), color var(--transition);
  position: relative;
}

#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;
  font-size: 1.2rem;
  font-weight: 400;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

#faq summary:hover {
  background: rgba(139, 94, 60, 0.05);
  color: var(--primary);
}

#faq details p {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin: 0;
  border-top: 1px solid var(--border);
  padding-top: 18px;
  animation: fadeInUp 0.4s var(--transition-slow) both;
}

#contact address {
  font-style: normal;
  padding: 28px 32px;
  background: var(--gradient-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

#contact address p {
  margin-bottom: 12px;
  padding-left: 24px;
  position: relative;
  font-size: 0.98rem;
}

#contact address p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: rotate(45deg);
}

#contact address a {
  font-weight: 600;
  border-bottom: 1px dashed var(--primary-light);
  padding-bottom: 1px;
}

#contact address a:hover {
  border-bottom-style: solid;
}

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

#sitemap ul li,
#links ul li {
  padding: 12px 18px;
  border-bottom: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

#sitemap ul li:hover,
#links ul li:hover {
  padding-left: 24px;
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

#sitemap ul li::before,
#links ul li::before {
  display: none;
}

#sitemap ul li a,
#links ul li a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  color: var(--primary);
}

#legal p {
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--text-secondary);
}

#legal time {
  font-weight: 600;
  color: var(--primary);
}

#author-info p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--text-secondary);
  padding-left: 24px;
  position: relative;
  margin-bottom: 12px;
}

#author-info p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transform: rotate(45deg);
}

#author-info time {
  font-weight: 600;
  color: var(--primary);
}

footer {
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.9);
  padding: 56px 24px 32px;
  margin-top: 40px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.06) 0%, transparent 40%);
  pointer-events: none;
}

footer nav {
  max-width: 1280px;
  margin: 0 auto 32px;
  position: relative;
}

footer nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
}

footer nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}

footer nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.6);
  transform: scaleX(0);
  transition: transform var(--transition);
}

footer nav a:hover {
  color: #fff;
  opacity: 1;
}

footer nav a:hover::after {
  transform: scaleX(1);
}

footer > p {
  max-width: 1280px;
  margin: 0 auto 10px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  position: relative;
}

#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.9);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  text-align: center;
  line-height: 1.2;
  padding: 4px;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 12px 32px rgba(139, 94, 60, 0.4);
}

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

@media (max-width: 1024px) {
  .header-inner {
    gap: 12px;
    padding: 0 16px;
  }

  #site-header nav a {
    padding: 8px 10px;
    font-size: 0.86rem;
  }

  #site-header input[type="search"] {
    width: 140px;
  }

  #site-header input[type="search"]:focus {
    width: 170px;
  }

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

  #hero ul[aria-label="平台数据"] {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  body {
    font-size: 15px;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }

  .logo {
    font-size: 1.2rem;
  }

  .logo svg {
    width: 40px;
    height: 40px;
  }

  #menu-toggle {
    display: block;
    margin-left: auto;
  }

  #site-header nav {
    order: 10;
    flex-basis: 100%;
    display: none;
    justify-content: flex-start;
  }

  #site-header nav.open {
    display: block;
    animation: fadeInUp 0.3s var(--transition-slow) both;
  }

  #site-header nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0;
  }

  #site-header nav a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  #site-header nav a::after {
    display: none;
  }

  #site-header form[role="search"] {
    order: 11;
    flex-basis: 100%;
    display: none;
    padding: 8px 0;
  }

  #site-header form[role="search"].open {
    display: flex;
    animation: fadeInUp 0.3s var(--transition-slow) both;
  }

  #site-header input[type="search"] {
    flex: 1;
    width: auto;
  }

  #site-header input[type="search"]:focus {
    width: auto;
  }

  #theme-toggle {
    order: 2;
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  main > section,
  main > nav {
    padding: 40px 16px;
  }

  #hero {
    padding: 56px 16px 48px;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }

  #hero h1 {
    font-size: 1.6rem;
  }

  #hero > p {
    font-size: 0.92rem;
    text-align: left;
  }

  #hero figure {
    margin-bottom: 32px;
  }

  #hero figcaption {
    padding: 12px 16px;
    font-size: 0.82rem;
  }

  .hero-banner {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-bottom: 32px;
  }

  .hero-banner article {
    padding: 22px 20px;
  }

  #hero ul[aria-label="平台数据"] {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  #hero ul[aria-label="平台数据"] li {
    padding: 18px 12px;
    font-size: 0.8rem;
  }

  main > nav[aria-label="页内锚点导航"] ul {
    padding: 12px 14px;
    gap: 6px;
  }

  main > nav[aria-label="页内锚点导航"] a {
    padding: 5px 12px;
    font-size: 0.8rem;
  }

  main > section h2 {
    font-size: 1.4rem;
    margin-bottom: 22px;
  }

  main > section h3 {
    font-size: 1.1rem;
    margin: 28px 0 12px;
  }

  main > section p {
    font-size: 0.94rem;
    line-height: 1.85;
  }

  main > section ul li,
  main > section ol li {
    font-size: 0.92rem;
    padding: 8px 0 8px 28px;
  }

  main > section ol li {
    padding-left: 38px;
  }

  main > section ol li::before {
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
  }

  #news article,
  #articles article {
    padding: 20px;
  }

  #news article h3,
  #articles article h3 {
    font-size: 1.05rem;
  }

  #reviews blockquote {
    padding: 22px 20px 22px 28px;
  }

  #reviews blockquote::before {
    font-size: 3rem;
    left: 10px;
  }

  #faq summary {
    padding: 16px 18px;
    font-size: 0.94rem;
  }

  #faq summary::after {
    width: 24px;
    height: 24px;
    font-size: 1rem;
  }

  #faq details p {
    padding: 14px 18px 18px;
    font-size: 0.9rem;
  }

  #contact address {
    padding: 22px 20px;
  }

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

  #sitemap ul li,
  #links ul li {
    padding: 10px 14px;
  }

  footer {
    padding: 40px 16px 24px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  footer nav ul {
    gap: 6px 16px;
  }

  footer nav a {
    font-size: 0.86rem;
  }

  footer > p {
    font-size: 0.78rem;
  }

  #back-to-top {
    right: 16px;
    bottom: 16px;
    width: 46px;
    height: 46px;
    font-size: 0.65rem;
  }
}

@media (max-width: 480px) {
  #hero h1 {
    font-size: 1.35rem;
  }

  #hero ul[aria-label="平台数据"] {
    grid-template-columns: 1fr 1fr;
  }

  #hero ul[aria-label="平台数据"] strong {
    font-size: 1.4rem;
  }

  .logo span {
    font-size: 1.05rem;
  }

  #theme-toggle {
    padding: 7px 12px;
    font-size: 0.75rem;
  }

  #menu-toggle {
    padding: 7px 12px;
    font-size: 0.75rem;
  }
}

@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,
  #menu-toggle,
  #theme-toggle,
  main > nav[aria-label="页内锚点导航"] {
    display: none;
  }

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

  main > section {
    page-break-inside: avoid;
  }
}