:root {
  --brand: #c8102e;
  --brand-dark: #9e0c24;
  --brand-light: #e63950;
  --accent: #f5b301;
  --accent-soft: rgba(245, 179, 1, 0.15);
  --bg: #f6f4f1;
  --bg-alt: #ffffff;
  --bg-soft: rgba(255, 255, 255, 0.72);
  --text: #1f1c1a;
  --text-soft: #5a544f;
  --text-mute: #8a827b;
  --border: rgba(31, 28, 26, 0.1);
  --shadow: 0 18px 45px rgba(31, 28, 26, 0.1);
  --shadow-sm: 0 8px 22px rgba(31, 28, 26, 0.08);
  --radius: 20px;
  --radius-sm: 14px;
  --radius-lg: 30px;
  --maxw: 1180px;
  --header-h: 72px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121013;
    --bg-alt: #1a171b;
    --bg-soft: rgba(26, 23, 27, 0.72);
    --text: #f2eeea;
    --text-soft: #c7bfb8;
    --text-mute: #948b84;
    --border: rgba(242, 238, 234, 0.12);
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 8px 22px rgba(0, 0, 0, 0.4);
    --brand-light: #ff4d63;
    --accent-soft: rgba(245, 179, 1, 0.2);
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 10% -10%, rgba(200, 16, 46, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(245, 179, 1, 0.12), transparent 55%),
    radial-gradient(1000px 700px at 50% 120%, rgba(200, 16, 46, 0.08), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

a:hover,
a:focus-visible {
  color: var(--brand-light);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.7rem, 1.2rem + 2.2vw, 2.9rem);
  margin: 0 0 1.2rem;
}

h2 {
  font-size: clamp(1.4rem, 1.1rem + 1.3vw, 2.05rem);
  margin: 0 0 1rem;
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
}

h3 {
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  margin: 1.8rem 0 0.7rem;
}

h4 {
  font-size: 1.05rem;
  margin: 1.4rem 0 0.5rem;
}

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

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

li {
  margin-bottom: 0.45rem;
}

li::marker {
  color: var(--brand);
}

blockquote {
  margin: 1.2rem 0;
  padding: 1.1rem 1.4rem;
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-soft);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

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

/* ---------- Header ---------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-soft);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 6px 24px rgba(31, 28, 26, 0.06);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--text);
  padding: 8px 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  position: relative;
}

.logo::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.logo:hover {
  color: var(--brand);
}

#site-header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

#site-header nav a {
  display: inline-block;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 0.92rem;
  color: var(--text-soft);
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

#site-header nav a:hover,
#site-header nav a:focus-visible {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(200, 16, 46, 0.3);
}

/* ---------- Main ---------- */
main {
  display: block;
}

main > section,
main > nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

main > section {
  padding-top: 56px;
  padding-bottom: 24px;
}

main > section > * {
  animation: fadeUp 0.7s var(--ease) both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Hero ---------- */
#hero {
  max-width: none;
  padding: 0;
  margin: 0;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(200, 16, 46, 0.92) 0%, rgba(158, 12, 36, 0.88) 45%, rgba(31, 28, 26, 0.92) 100%),
    radial-gradient(800px 400px at 80% 10%, rgba(245, 179, 1, 0.5), transparent 60%);
  color: #fff;
  border-bottom: 1px solid var(--border);
}

#hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 15% 90%, rgba(245, 179, 1, 0.35), transparent 65%),
    radial-gradient(500px 260px at 90% 20%, rgba(255, 255, 255, 0.18), transparent 70%);
  pointer-events: none;
}

#hero > * {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

#hero h1 {
  padding-top: 72px;
  color: #fff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  animation: fadeUp 0.8s var(--ease) both;
}

#hero p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 880px;
  font-size: 1.02rem;
  animation: fadeUp 0.8s 0.1s var(--ease) both;
}

#hero p:last-of-type {
  padding-bottom: 64px;
  animation-delay: 0.2s;
}

/* ---------- Anchor Nav ---------- */
main > nav[aria-label="页面锚点导航"] {
  margin-top: -28px;
  position: relative;
  z-index: 5;
  padding-top: 0;
  padding-bottom: 0;
}

main > nav[aria-label="页面锚点导航"] ul {
  list-style: none;
  margin: 0;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--bg-soft);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

main > nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text-soft);
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.25s var(--ease);
}

main > nav[aria-label="页面锚点导航"] a:hover,
main > nav[aria-label="页面锚点导航"] a:focus-visible {
  color: var(--brand);
  background: var(--accent-soft);
  border-color: rgba(245, 179, 1, 0.4);
  transform: translateY(-2px);
}

/* ---------- Section Cards ---------- */
main > section[id]:not(#hero) {
  position: relative;
}

main > section[id]:not(#hero) > h2 {
  margin-top: 0;
}

main > section[id]:not(#hero) h3 + p,
main > section[id]:not(#hero) p + h3 {
  margin-top: 1.2rem;
}

/* Card-like inner blocks for articles, news, faq */
#news article,
#articles article,
#reviews blockquote,
#knowledge h3,
#howto h3,
#faq h3,
#advantages h3,
#solutions h3,
#scenarios h3,
#cases h3,
#products h3,
#history h3,
#culture h3,
#about h3 {
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

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

#news article::before,
#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(200, 16, 46, 0.25);
}

#news article:hover::before,
#articles article:hover::before {
  opacity: 1;
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  color: var(--text);
}

#news article p,
#articles article p {
  margin-bottom: 0.6rem;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  box-shadow: 0 6px 16px rgba(200, 16, 46, 0.25);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

#articles article a::after {
  content: "→";
  transition: transform 0.25s var(--ease);
}

#articles article a:hover,
#articles article a:focus-visible {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(200, 16, 46, 0.35);
  background: linear-gradient(135deg, var(--brand-light), var(--brand));
}

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

/* FAQ items */
#faq h3 {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 0 0 0.6rem;
  box-shadow: var(--shadow-sm);
  font-size: 1.02rem;
  position: relative;
  padding-left: 46px;
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#faq h3 + p {
  background: var(--bg-soft);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-top: 0;
  margin-bottom: 1.2rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#faq h3:hover {
  transform: translateX(4px);
  border-color: rgba(200, 16, 46, 0.3);
  box-shadow: var(--shadow);
}

/* Reviews */
#reviews blockquote {
  position: relative;
  padding-left: 3.4rem;
}

#reviews blockquote::before {
  content: "“";
  position: absolute;
  left: 14px;
  top: 6px;
  font-size: 3.4rem;
  line-height: 1;
  color: var(--brand);
  opacity: 0.35;
  font-family: Georgia, "Times New Roman", serif;
}

#reviews blockquote:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

/* Cases / Solutions / Scenarios / Products / Advantages cards */
#cases h3,
#solutions h3,
#scenarios h3,
#products h3,
#advantages h3 {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border-left: 4px solid var(--brand);
  box-shadow: var(--shadow-sm);
}

#cases h3:hover,
#solutions h3:hover,
#scenarios h3:hover,
#products h3:hover,
#advantages h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

/* Knowledge & Howto */
#knowledge h3,
#howto h3 {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

#knowledge h3:hover,
#howto h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: rgba(200, 16, 46, 0.25);
}

#howto ol li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}

#howto ol li:last-child {
  border-bottom: none;
}

/* About info list */
#about ul {
  list-style: none;
  padding: 18px 20px;
  margin: 0 0 1.2rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 8px;
}

#about ul li {
  margin: 0;
  padding-left: 22px;
  position: relative;
  color: var(--text-soft);
}

#about ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--accent));
}

/* Contact & Sitemap & Links */
#contact ul,
#sitemap ul,
#links ul {
  list-style: none;
  padding: 18px 20px;
  margin: 0 0 1.2rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 6px;
}

#sitemap ul {
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#links ul li {
  margin: 0;
}

#links ul a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-soft);
  transition: all 0.25s var(--ease);
}

#links ul a:hover,
#links ul a:focus-visible {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(200, 16, 46, 0.3);
}

#sitemap ul a {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 0.92rem;
  transition: all 0.25s var(--ease);
}

#sitemap ul a:hover,
#sitemap ul a:focus-visible {
  background: var(--accent-soft);
  color: var(--brand);
  transform: translateX(3px);
}

#contact ul li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}

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

#contact h3 {
  margin-top: 1.6rem;
}

/* ---------- Footer ---------- */
footer {
  margin-top: 64px;
  padding: 56px 20px 32px;
  background:
    linear-gradient(180deg, rgba(31, 28, 26, 0.96), rgba(18, 16, 19, 0.98)),
    radial-gradient(700px 300px at 20% 0%, rgba(200, 16, 46, 0.35), transparent 60%);
  color: rgba(255, 255, 255, 0.82);
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--brand), var(--accent), var(--brand)) 1;
}

footer section {
  max-width: var(--maxw);
  margin: 0 auto 28px;
}

footer h2 {
  color: #fff;
  font-size: 1.1rem;
  padding-left: 14px;
  margin: 0 0 0.7rem;
}

footer h2::before {
  width: 4px;
  background: linear-gradient(180deg, var(--accent), var(--brand-light));
}

footer p,
footer li {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

footer ul li {
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

footer ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}

footer > p {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
}

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

footer a:hover {
  color: #fff;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .header-inner {
    padding: 10px 16px;
    min-height: auto;
  }

  #site-header nav ul {
    gap: 2px;
  }

  #site-header nav a {
    padding: 6px 10px;
    font-size: 0.85rem;
  }

  main > section {
    padding-top: 44px;
  }

  #hero h1 {
    padding-top: 52px;
  }

  #hero p:last-of-type {
    padding-bottom: 52px;
  }

  main > nav[aria-label="页面锚点导航"] {
    margin-top: -20px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  #site-header nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  #site-header nav::-webkit-scrollbar {
    display: none;
  }

  #site-header nav ul {
    flex-wrap: nowrap;
    width: max-content;
  }

  #site-header nav a {
    white-space: nowrap;
  }

  main > section,
  main > nav {
    padding-left: 16px;
    padding-right: 16px;
  }

  #hero > * {
    padding-left: 16px;
    padding-right: 16px;
  }

  #hero h1 {
    padding-top: 40px;
  }

  #hero p:last-of-type {
    padding-bottom: 44px;
  }

  main > nav[aria-label="页面锚点导航"] {
    margin-top: -16px;
  }

  main > nav[aria-label="页面锚点导航"] ul {
    padding: 10px 12px;
    gap: 6px;
  }

  main > nav[aria-label="页面锚点导航"] a {
    padding: 5px 11px;
    font-size: 0.82rem;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

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

  #faq h3 {
    padding: 12px 14px 12px 42px;
  }

  #faq h3::before {
    left: 12px;
    width: 22px;
    height: 22px;
    font-size: 0.72rem;
  }

  #reviews blockquote {
    padding-left: 2.6rem;
  }

  #reviews blockquote::before {
    left: 10px;
    font-size: 2.8rem;
  }

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
  }

  footer {
    padding: 40px 16px 24px;
  }
}

@media (max-width: 380px) {
  #sitemap ul {
    grid-template-columns: 1fr;
  }
}

/* ---------- Reduced motion ---------- */
@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;
  }
}

/* ---------- Print ---------- */
@media print {
  #site-header,
  main > nav,
  footer {
    display: none;
  }

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

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

  #hero h1,
  #hero p {
    color: #000;
  }
}