:root {
  --color-primary: #8B4513;
  --color-primary-dark: #5C2E0E;
  --color-primary-light: #C8A97E;
  --color-accent: #B8860B;
  --color-bg: #FAF3E8;
  --color-bg-alt: #F5EBDD;
  --color-surface: #FFFFFF;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-text: #3A2A1A;
  --color-text-soft: #6B5540;
  --color-text-inverse: #FDF8F0;
  --color-border: rgba(139, 69, 19, 0.18);
  --color-shadow: rgba(92, 46, 14, 0.14);
  --gradient-banner: linear-gradient(135deg, #8B4513 0%, #B8860B 45%, #C8A97E 100%);
  --gradient-soft: linear-gradient(135deg, rgba(139, 69, 19, 0.08), rgba(200, 169, 126, 0.16));
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 8px 24px var(--color-shadow);
  --shadow-lg: 0 16px 44px rgba(92, 46, 14, 0.18);
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --max-width: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A1410;
    --color-bg-alt: #221A14;
    --color-surface: #2A2018;
    --color-surface-glass: rgba(42, 32, 24, 0.68);
    --color-text: #EDE0CE;
    --color-text-soft: #C4B29A;
    --color-text-inverse: #1A1410;
    --color-border: rgba(200, 169, 126, 0.22);
    --color-shadow: rgba(0, 0, 0, 0.45);
    --gradient-banner: linear-gradient(135deg, #4A2510 0%, #6B4515 45%, #8B6B3E 100%);
    --gradient-soft: linear-gradient(135deg, rgba(200, 169, 126, 0.1), rgba(139, 69, 19, 0.16));
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 44px rgba(0, 0, 0, 0.6);
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(circle at 12% 8%, rgba(200, 169, 126, 0.14), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(139, 69, 19, 0.1), transparent 38%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

a:hover,
a:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--color-primary-dark);
  line-height: 1.35;
  margin: 0 0 0.6em;
  letter-spacing: 0.02em;
}

@media (prefers-color-scheme: dark) {
  h1,
  h2,
  h3,
  h4 {
    color: var(--color-primary-light);
  }
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  padding-bottom: 0.4em;
  position: relative;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-banner);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
}

p {
  margin: 0 0 1em;
  color: var(--color-text-soft);
}

ul,
ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  color: var(--color-text-soft);
}

li {
  margin-bottom: 0.45em;
}

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

@media (prefers-color-scheme: dark) {
  strong {
    color: var(--color-primary-light);
  }
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

blockquote p {
  margin: 0.4em 0;
  font-style: italic;
  color: var(--color-text);
}

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--color-text-soft);
  opacity: 0.85;
}

/* ============ 布局容器 ============ */

header,
main,
footer {
  width: 100%;
}

main > section,
main > nav,
header > .brand-bar,
header > .main-header,
header > nav,
footer > section {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ============ 顶部品牌条 ============ */

header {
  position: relative;
}

.brand-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 10px;
  padding-bottom: 10px;
  background: var(--gradient-banner);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.brand-slogan {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--color-text-inverse);
  opacity: 0.95;
}

.brand-bar nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.brand-bar nav a {
  font-size: 0.82rem;
  color: var(--color-text-inverse);
  opacity: 0.9;
}

.brand-bar nav a:hover {
  opacity: 1;
  color: #FFF6E5;
  text-decoration: underline;
}

/* ============ 主导航 ============ */

.main-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 14px;
  padding-top: 12px;
  padding-bottom: 12px;
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.logo-area a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary-dark);
}

.logo-area a:hover {
  text-decoration: none;
  opacity: 0.85;
}

.logo-area svg {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.logo-area a:hover svg {
  transform: rotate(-6deg) scale(1.05);
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

@media (prefers-color-scheme: dark) {
  .logo-area a {
    color: var(--color-primary-light);
  }
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: inline-block;
  padding: 6px 13px;
  font-size: 0.88rem;
  color: var(--color-text);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--color-text-inverse);
  background: var(--gradient-banner);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ============ 面包屑 ============ */

header > nav[aria-label="面包屑导航"] {
  padding-top: 12px;
  padding-bottom: 4px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: var(--color-primary-light);
}

.breadcrumb a {
  color: var(--color-text-soft);
}

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

/* ============ Hero 渐变 Banner ============ */

#hero {
  position: relative;
  margin-top: 20px;
  padding: 44px 32px 36px;
  background: var(--gradient-banner);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 65%);
  border-radius: 50%;
  z-index: -1;
  animation: floatGlow 12s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -50% -12%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(255, 246, 229, 0.18), transparent 68%);
  border-radius: 50%;
  z-index: -1;
  animation: floatGlow 16s ease-in-out infinite alternate-reverse;
}

@keyframes floatGlow {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-24px, 20px, 0) scale(1.08);
  }
}

#hero h1 {
  color: #FFF9F0;
  text-shadow: 0 2px 12px rgba(60, 28, 8, 0.35);
  max-width: 20em;
}

.hero-lead {
  max-width: 62em;
  color: rgba(255, 249, 240, 0.94);
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 1.4em;
}

#hero figure {
  margin: 0 0 1.4em;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

#hero figure:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

#hero figure svg {
  border-radius: var(--radius-sm);
}

#hero figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  text-align: center;
  color: rgba(255, 249, 240, 0.88);
  letter-spacing: 0.06em;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-facts li {
  margin: 0;
  padding: 14px 18px;
  font-size: 0.9rem;
  color: #FFF9F0;
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: var(--radius-md);
  transition: transform var(--transition), background var(--transition);
}

.hero-facts li::before {
  content: "◆";
  margin-right: 8px;
  font-size: 0.7em;
  color: #FFE9C4;
}

.hero-facts li:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.24);
}

/* ============ 内容导航 ============ */

main > nav[aria-label="页面内部锚点导航"] {
  margin-top: 26px;
  padding: 24px 28px;
  background: var(--color-surface-glass);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

main > nav[aria-label="页面内部锚点导航"] h2 {
  font-size: 1.15rem;
  margin-bottom: 0.8em;
}

main > nav[aria-label="页面内部锚点导航"] ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 8px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

main > nav[aria-label="页面内部锚点导航"] li {
  margin: 0;
}

main > nav[aria-label="页面内部锚点导航"] a {
  display: block;
  padding: 8px 12px;
  font-size: 0.88rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition);
}

main > nav[aria-label="页面内部锚点导航"] a::before {
  content: "→ ";
  color: var(--color-accent);
  opacity: 0.7;
}

main > nav[aria-label="页面内部锚点导航"] a:hover {
  color: var(--color-primary);
  background: var(--gradient-soft);
  border-color: var(--color-border);
  text-decoration: none;
  transform: translateX(4px);
}

/* ============ 通用内容区块 ============ */

main > section {
  margin-top: 28px;
  padding: 32px 30px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 40%;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

main > section h3 {
  margin-top: 1.2em;
}

main > section > h3:first-of-type {
  margin-top: 0.4em;
}

/* 企业信息列表 */
#about ul,
#contact ul,
#history ul,
#services ul,
#products ul,
#howto ul,
#howto ol,
#sitemap ul,
#links ul {
  padding: 18px 22px 18px 2.4em;
  background: var(--gradient-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 4px 20px;
  padding-left: 2.4em;
}

#sitemap li,
#links li {
  margin-bottom: 0.2em;
}

/* ============ 新闻/文章卡片 ============ */

#news,
#articles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

#news > article,
#articles > article {
  position: relative;
  margin: 0 0 18px;
  padding: 22px 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news > article:last-of-type,
#articles > article:last-of-type {
  margin-bottom: 0;
}

#news > article::before,
#articles > article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-banner);
  opacity: 0.85;
}

#news > article:hover,
#articles > article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

#news > article h3,
#articles > article h3 {
  margin-bottom: 0.35em;
  font-size: 1.12rem;
}

#news > article p,
#articles > article p {
  margin-bottom: 0.5em;
}

#articles > article a {
  display: inline-block;
  margin-top: 4px;
  padding: 5px 16px;
  font-size: 0.84rem;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  transition: all var(--transition);
}

#articles > article a:hover {
  color: var(--color-text-inverse);
  background: var(--gradient-banner);
  border-color: transparent;
  text-decoration: none;
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

/* 文章网格（宽屏分栏） */
@media (min-width: 860px) {
  #articles {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    align-items: stretch;
  }

  #articles > article {
    margin-bottom: 0;
  }

  #articles > article:last-of-type {
    margin-bottom: 0;
  }
}

/* ============ FAQ 手风琴 ============ */

#faq details {
  margin-bottom: 12px;
  padding: 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

#faq details:last-of-type {
  margin-bottom: 0;
}

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

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

#faq summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition), color var(--transition);
}

@media (prefers-color-scheme: dark) {
  #faq summary {
    color: var(--color-primary-light);
  }
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.15rem;
  color: var(--color-primary-light);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
  background: var(--gradient-banner);
  color: var(--color-text-inverse);
  border-color: transparent;
}

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

#faq details > p {
  margin: 0;
  padding: 0 22px 18px;
  animation: fadeIn 0.4s ease both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ 教程区块 ============ */

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 22px;
}

#howto ol li {
  position: relative;
  padding-left: 40px;
  margin-bottom: 0.7em;
  counter-increment: step;
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-inverse);
  background: var(--gradient-banner);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

/* ============ 页脚 ============ */

footer {
  margin-top: 44px;
  padding: 40px 0 28px;
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
  border-top: 1px solid var(--color-border);
}

footer > section {
  padding-top: 22px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--color-border);
}

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

footer > section:first-of-type {
  padding-top: 0;
}

footer h2 {
  font-size: 1.05rem;
  margin-bottom: 0.6em;
}

footer h2::after {
  width: 40px;
  height: 2px;
}

footer h3 {
  font-size: 0.92rem;
  margin-top: 1em;
  margin-bottom: 0.3em;
  color: var(--color-text);
}

footer p {
  font-size: 0.86rem;
  margin-bottom: 0.6em;
}

footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.86rem;
}

footer li {
  margin-bottom: 0.35em;
  color: var(--color-text-soft);
}

footer[role="contentinfo"] > section[aria-labelledby="footer-meta-title"] ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 4px 20px;
}

footer[role="contentinfo"] > section[aria-labelledby="footer-meta-title"] li {
  padding: 8px 12px;
  background: var(--color-surface-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

/* ============ 响应式 ============ */

@media (max-width: 860px) {
  .main-header {
    border-radius: var(--radius-md);
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .main-nav {
    width: 100%;
    gap: 2px 4px;
  }

  .main-nav a {
    padding: 5px 10px;
    font-size: 0.82rem;
  }

  #hero {
    padding: 32px 22px 28px;
  }

  main > section {
    padding: 26px 20px;
    border-radius: var(--radius-md);
  }

  main > nav[aria-label="页面内部锚点导航"] {
    padding: 20px 18px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .brand-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  }

  .brand-slogan {
    font-size: 0.76rem;
    letter-spacing: 0.06em;
  }

  .brand-bar nav ul {
    gap: 2px 14px;
  }

  .main-header {
    margin-top: 10px;
    gap: 8px;
  }

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

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

  #hero {
    margin-top: 14px;
    padding: 26px 16px 22px;
    border-radius: var(--radius-md);
  }

  .hero-facts {
    grid-template-columns: 1fr;
  }

  main > section,
  main > nav[aria-label="页面内部锚点导航"] {
    margin-top: 18px;
    padding: 20px 16px;
  }

  main > nav[aria-label="页面内部锚点导航"] ul {
    grid-template-columns: 1fr;
  }

  #news > article,
  #articles > article {
    padding: 18px 16px 18px 20px;
  }

  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.94rem;
  }

  #faq details > p {
    padding: 0 16px 16px;
  }

  footer {
    margin-top: 28px;
    padding: 28px 0 20px;
  }

  footer > section {
    padding-left: 16px;
    padding-right: 16px;
  }
}

/* ============ 动效降级 ============ */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============ 打印 ============ */

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .main-header,
  .brand-bar,
  main > nav[aria-label="页面内部锚点导航"],
  footer {
    display: none;
  }

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