:root {
  --color-primary: #6B4A2B;
  --color-primary-light: #8B6A4B;
  --color-primary-dark: #4A3018;
  --color-accent: #C49A6C;
  --color-accent-light: #E0C4A8;
  --color-bg: #FAF7F2;
  --color-bg-alt: #F0EAE0;
  --color-surface: #FFFFFF;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-text: #2C2418;
  --color-text-secondary: #5C5040;
  --color-text-muted: #8A7E6E;
  --color-border: #E0D8CC;
  --color-border-light: #EDE6DC;
  --color-shadow: rgba(107, 74, 43, 0.08);
  --color-shadow-md: rgba(107, 74, 43, 0.12);
  --color-shadow-lg: rgba(107, 74, 43, 0.18);
  --gradient-hero: linear-gradient(135deg, #6B4A2B 0%, #8B6A4B 40%, #C49A6C 100%);
  --gradient-hero-overlay: linear-gradient(180deg, rgba(107, 74, 43, 0.85) 0%, rgba(74, 48, 24, 0.92) 100%);
  --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #FAF7F2 100%);
  --gradient-accent: linear-gradient(135deg, #C49A6C 0%, #E0C4A8 100%);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --max-width: 1160px;
  --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(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #C49A6C;
    --color-primary-light: #D4B08C;
    --color-primary-dark: #8B6A4B;
    --color-accent: #E0C4A8;
    --color-accent-light: #F0DCC4;
    --color-bg: #1A1510;
    --color-bg-alt: #221C15;
    --color-surface: #2A231B;
    --color-surface-glass: rgba(42, 35, 27, 0.72);
    --color-text: #EDE6DC;
    --color-text-secondary: #C8BEAE;
    --color-text-muted: #8A7E6E;
    --color-border: #3A3228;
    --color-border-light: #332C23;
    --color-shadow: rgba(0, 0, 0, 0.25);
    --color-shadow-md: rgba(0, 0, 0, 0.35);
    --color-shadow-lg: rgba(0, 0, 0, 0.45);
    --gradient-hero: linear-gradient(135deg, #2A231B 0%, #4A3018 40%, #8B6A4B 100%);
    --gradient-hero-overlay: linear-gradient(180deg, rgba(26, 21, 16, 0.88) 0%, rgba(26, 21, 16, 0.95) 100%);
    --gradient-card: linear-gradient(145deg, #2A231B 0%, #221C15 100%);
  }
}

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

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

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

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

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

a:hover {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 0.75rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  border-radius: var(--radius-full);
  background: var(--gradient-accent);
  transition: width var(--transition-slow);
}

section:hover > h2::after {
  width: 88px;
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  margin-bottom: 0.75rem;
  margin-top: 1.75rem;
}

h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  margin-top: 1.25rem;
  color: var(--color-primary);
}

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

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

blockquote {
  position: relative;
  margin: 1.5rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2.5rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent);
  box-shadow: 0 2px 12px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

blockquote:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--color-shadow-md);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  top: 0.25rem;
  left: 0.75rem;
  font-family: var(--font-serif);
  font-size: 3rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.4;
}

blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header:hover {
  box-shadow: 0 4px 24px var(--color-shadow);
}

.brand-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.5rem 0.5rem;
}

.brand-bar strong {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  letter-spacing: 0.15em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--color-primary);
}

.brand-bar span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

nav[aria-label="主导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

nav[aria-label="主导航"]::-webkit-scrollbar {
  display: none;
}

nav[aria-label="主导航"] ul {
  display: flex;
  gap: 0.25rem;
  flex-wrap: nowrap;
  padding-bottom: 0.35rem;
}

nav[aria-label="主导航"] li {
  flex-shrink: 0;
}

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

nav[aria-label="主导航"] a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
  transform: translateY(-1px);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

nav[aria-label="面包屑导航"] {
  padding: 1rem 0;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--color-border);
}

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

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

section {
  margin-bottom: 3rem;
  scroll-margin-top: 120px;
}

section > p:first-of-type {
  color: var(--color-text-secondary);
}

#hero {
  position: relative;
  margin: 1.5rem 0 3rem;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.5rem, 4vw, 3rem);
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  background-size: 200% 200%;
  animation: heroGradient 12s ease infinite;
  overflow: hidden;
  box-shadow: 0 12px 48px var(--color-shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-hero-overlay);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  top: -150px;
  right: -100px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(224, 196, 168, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

#hero h1 {
  position: relative;
  z-index: 1;
  color: #FFFFFF;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  margin-bottom: 1.5rem;
}

#hero p {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  line-height: 1.85;
  max-width: 820px;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.2);
}

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

#about,
#history,
#culture,
#products,
#advantages,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#howto,
#faq,
#contact,
#author,
#sitemap,
#links,
#legal {
  background: var(--gradient-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: 0 2px 16px var(--color-shadow);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

#about:hover,
#history:hover,
#culture:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#applications:hover,
#cases:hover,
#reviews:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#howto:hover,
#faq:hover,
#contact:hover,
#author:hover,
#sitemap:hover,
#links:hover,
#legal:hover {
  box-shadow: 0 8px 36px var(--color-shadow-md);
  border-color: var(--color-border);
}

#products h3,
#advantages h3,
#solutions h3,
#applications h3,
#cases h3 {
  padding-left: 1rem;
  border-left: 3px solid var(--color-accent);
  transition: border-color var(--transition-fast), padding-left var(--transition-base);
}

#products h3:hover,
#advantages h3:hover,
#solutions h3:hover,
#applications h3:hover,
#cases h3:hover {
  border-left-color: var(--color-primary);
  padding-left: 1.25rem;
}

#cases h3 {
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-accent);
  margin-top: 1.5rem;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#cases h3:hover {
  background: var(--color-surface);
  transform: translateX(4px);
  box-shadow: 0 4px 16px var(--color-shadow);
}

#reviews blockquote {
  margin: 1.25rem 0;
}

#reviews blockquote:nth-child(2) {
  margin-left: auto;
  max-width: 92%;
}

#reviews blockquote:nth-child(3) {
  margin-right: auto;
  max-width: 92%;
}

#news h3 {
  display: inline-block;
  margin-bottom: 0.35rem;
}

#news h3 + p:first-of-type {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

#news h3 + p + p {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

#articles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

#articles > h2 {
  grid-column: 1 / -1;
}

#articles article {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 2px 10px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

#articles article:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px var(--color-shadow-md);
  border-color: var(--color-accent);
}

#articles article:hover::before {
  transform: scaleX(1);
}

#articles article h3 {
  margin-top: 0;
  font-size: 1.15rem;
  transition: color var(--transition-fast);
}

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

#articles article > p:nth-of-type(1) {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

#articles article > p:nth-of-type(2) {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 0.35rem 0;
  position: relative;
}

#articles article a::after {
  content: "\2192";
  transition: transform var(--transition-fast);
}

#articles article a:hover {
  color: var(--color-accent);
}

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

#knowledge h3 {
  color: var(--color-primary);
  margin-top: 1.5rem;
}

#howto h4 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--color-border-light);
  transition: padding-left var(--transition-fast), border-color var(--transition-fast);
}

#howto h4:hover {
  padding-left: 0.5rem;
  border-color: var(--color-accent);
}

#howto h4::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-accent);
  flex-shrink: 0;
}

#faq h3 {
  color: var(--color-text);
  margin-top: 1.75rem;
  padding-left: 1rem;
  border-left: 3px solid var(--color-accent);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  cursor: default;
}

#faq h3:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

#faq h3 + p {
  padding-left: 1rem;
  color: var(--color-text-secondary);
}

#contact p {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 0;
  transition: padding-left var(--transition-fast), background var(--transition-fast);
}

#contact p:hover {
  padding-left: 0.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
}

#contact p:last-child {
  border-bottom: none;
}

#author p {
  font-size: 0.92rem;
  margin-bottom: 0.5rem;
}

#author p:first-of-type {
  color: var(--color-primary);
  font-weight: 600;
}

#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#sitemap li,
#links li {
  flex: 0 0 auto;
}

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  font-size: 0.88rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-shadow-md);
}

#legal h2 {
  font-size: 1.15rem;
  margin-top: 1.75rem;
}

#legal h2:first-child {
  margin-top: 0;
}

#legal h2::after {
  width: 32px;
  height: 2px;
}

#legal p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: 2rem;
}

footer p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
}

footer p:last-child {
  margin-bottom: 0;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
}

@media (prefers-color-scheme: dark) {
  footer {
    background: #120E0A;
  }
}

@supports (animation-timeline: view()) {
  section,
  #articles article,
  blockquote {
    animation: fadeUp linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 30%;
  }

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

@supports not (animation-timeline: view()) {
  section,
  #articles article,
  blockquote {
    opacity: 1;
    transform: none;
  }
}

@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;
  }

  #hero {
    animation: none;
  }
}

@media (min-width: 640px) {
  #articles {
    grid-template-columns: repeat(2, 1fr);
  }

  #articles article:first-of-type {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  #articles {
    grid-template-columns: repeat(2, 1fr);
  }

  #articles article:first-of-type {
    grid-column: 1 / -1;
  }

  #articles article:first-of-type h3 {
    font-size: 1.35rem;
  }

  header {
    position: sticky;
  }

  nav[aria-label="主导航"] ul {
    justify-content: center;
  }

  .brand-bar {
    justify-content: center;
    text-align: center;
  }
}

@media (min-width: 1024px) {
  #articles {
    grid-template-columns: repeat(3, 1fr);
  }

  #articles article:first-of-type {
    grid-column: span 2;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  main {
    padding: 0 1rem 2rem;
  }

  .brand-bar {
    padding: 0.75rem 1rem 0.4rem;
  }

  .brand-bar strong {
    font-size: 1.2rem;
  }

  .brand-bar span {
    font-size: 0.75rem;
  }

  nav[aria-label="主导航"] {
    padding: 0 1rem 0.4rem;
  }

  nav[aria-label="主导航"] a {
    font-size: 0.82rem;
    padding: 0.35rem 0.7rem;
  }

  #hero {
    padding: 1.75rem 1.25rem;
    border-radius: var(--radius-lg);
  }

  section {
    margin-bottom: 2rem;
  }

  #sitemap a,
  #links a {
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
  }

  blockquote {
    padding: 1.25rem 1rem 1.25rem 2rem;
  }
}

::selection {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}