:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --secondary: #457b9d;
  --accent: #a8dadc;
  --dark: #1d3557;
  --light: #f1faee;
  --bg: #f8f9fb;
  --bg-elevated: #ffffff;
  --text: #1a1a2e;
  --text-soft: #4a4a5e;
  --text-muted: #7a7a92;
  --border: rgba(29, 53, 87, 0.1);
  --glass: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
  --shadow-sm: 0 2px 8px rgba(29, 53, 87, 0.06);
  --shadow-md: 0 8px 24px rgba(29, 53, 87, 0.1);
  --shadow-lg: 0 16px 48px rgba(29, 53, 87, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --gradient-hero: linear-gradient(135deg, #1d3557 0%, #2a4a6f 40%, #e63946 100%);
  --gradient-accent: linear-gradient(135deg, #e63946 0%, #f77f00 100%);
  --gradient-cool: linear-gradient(135deg, #457b9d 0%, #a8dadc 100%);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1522;
    --bg-elevated: #1a2233;
    --text: #e8ecf4;
    --text-soft: #b8c1d4;
    --text-muted: #7f8aa3;
    --border: rgba(168, 218, 220, 0.12);
    --glass: rgba(26, 34, 51, 0.65);
    --glass-border: rgba(168, 218, 220, 0.15);
    --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, 0.55);
    --gradient-hero: linear-gradient(135deg, #0a1220 0%, #1d3557 50%, #9d1f2c 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 20%, rgba(230, 57, 70, 0.08), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(69, 123, 157, 0.1), transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(168, 218, 220, 0.1), transparent 50%);
  pointer-events: none;
}

img,
svg {
  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);
}

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

/* ============ Header / Nav ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

nav[aria-label="主导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  padding: 10px 0;
  overflow-x: auto;
  scrollbar-width: none;
}

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

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

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  outline: none;
}

/* ============ Main layout ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 56px 0;
  animation: fadeUp 0.7s ease both;
}

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

section:nth-of-type(odd) {
  animation-delay: 0.05s;
}

/* ============ Hero ============ */
#hero {
  position: relative;
  margin-top: 32px;
  padding: 64px 48px;
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  top: -200px;
  right: -120px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  width: 320px;
  height: 320px;
  bottom: -160px;
  left: -80px;
  background: radial-gradient(circle, rgba(168, 218, 220, 0.25), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

#hero h1 {
  position: relative;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #fff 0%, #f1faee 50%, #a8dadc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#hero > p {
  position: relative;
  max-width: 820px;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 32px;
}

#hero figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

#hero figure:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: var(--shadow-lg);
}

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

#hero figcaption {
  padding: 12px 20px;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

/* ============ Headings ============ */
h2 {
  position: relative;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.3px;
  margin-bottom: 28px;
  padding-left: 20px;
  color: var(--text);
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 1.1em;
  border-radius: 999px;
  background: var(--gradient-accent);
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  font-weight: 700;
  line-height: 1.45;
  margin: 32px 0 14px;
  color: var(--text);
}

h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 22px 0 10px;
  color: var(--secondary);
}

p {
  margin-bottom: 16px;
  color: var(--text-soft);
}

p:last-child {
  margin-bottom: 0;
}

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

/* ============ Cards (generic content sections) ============ */
#brand,
#about,
#history,
#culture,
#products,
#advantages,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#faq,
#howto,
#sitemap,
#contact,
#team,
#credentials {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

#brand:hover,
#about:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#applications:hover,
#cases:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#faq:hover,
#howto:hover {
  box-shadow: var(--shadow-md);
}

/* ============ Reviews blockquotes ============ */
#reviews blockquote {
  position: relative;
  margin: 0 0 16px;
  padding: 22px 24px 22px 56px;
  background: var(--bg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

#reviews blockquote:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-left-color: var(--secondary);
}

#reviews blockquote::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 3rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--primary);
  opacity: 0.35;
}

#reviews blockquote p {
  margin: 0;
  font-size: 1rem;
  color: var(--text-soft);
  font-style: italic;
}

/* ============ News & Articles ============ */
#news article,
#articles article {
  position: relative;
  padding: 24px;
  margin-bottom: 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

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

#news article h3,
#articles article h3 {
  margin-top: 0;
  margin-bottom: 8px;
}

#news article time,
#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(230, 57, 70, 0.1);
  padding: 2px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(69, 123, 157, 0.1);
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

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

#articles article a:hover {
  background: var(--secondary);
  color: #fff;
  transform: translateY(-2px);
}

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

/* ============ FAQ details ============ */
#faq details {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition),
    background var(--transition);
}

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

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

#faq summary {
  position: relative;
  padding: 18px 52px 18px 22px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition), background var(--transition);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  line-height: 26px;
  text-align: center;
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--primary);
  border-radius: 50%;
  background: rgba(230, 57, 70, 0.1);
  transition: transform var(--transition), background var(--transition),
    color var(--transition);
}

#faq details[open] summary::after {
  content: "\2212";
  background: var(--primary);
  color: #fff;
  transform: translateY(-50%) rotate(180deg);
}

#faq details[open] summary {
  color: var(--primary);
  background: rgba(230, 57, 70, 0.04);
}

#faq details > p {
  padding: 0 22px 20px;
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-soft);
  animation: fadeUp 0.4s ease both;
}

/* ============ Lists (sitemap / footer links) ============ */
#sitemap ul,
footer ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

#sitemap li a,
footer ul li a {
  display: block;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  transition: background var(--transition), color var(--transition),
    transform var(--transition), border-color var(--transition);
}

#sitemap li a:hover,
footer ul li a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-3px);
}

/* ============ Contact address ============ */
#contact address {
  font-style: normal;
  display: grid;
  gap: 10px;
  padding: 24px;
  background: var(--bg);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border);
  margin-bottom: 20px;
}

#contact address p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-soft);
  padding-left: 26px;
  position: relative;
}

#contact address p::before {
  content: "\25CF";
  position: absolute;
  left: 6px;
  top: 0;
  color: var(--primary);
  font-size: 0.6rem;
  line-height: 1.75;
}

/* ============ Footer ============ */
footer[role="contentinfo"] {
  margin-top: 48px;
  padding: 56px 24px 32px;
  background: var(--dark);
  color: rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  position: relative;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
}

footer[role="contentinfo"] > section {
  max-width: var(--max-width);
  margin: 0 auto 36px;
  padding: 0;
  animation: none;
}

footer[role="contentinfo"] h2 {
  color: #fff;
  font-size: 1.15rem;
  margin-bottom: 18px;
  padding-left: 0;
}

footer[role="contentinfo"] h2::before {
  display: none;
}

footer[role="contentinfo"] p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  line-height: 1.8;
}

footer[role="contentinfo"] ul {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

footer[role="contentinfo"] ul li a {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.85);
}

footer[role="contentinfo"] ul li a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

footer[role="contentinfo"] > p {
  max-width: var(--max-width);
  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);
}

/* ============ Focus visibility ============ */
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(69, 123, 157, 0.35);
  border-radius: 999px;
  border: 2px solid var(--bg);
}

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

/* ============ Responsive ============ */
@media (max-width: 900px) {
  #hero {
    padding: 48px 32px;
  }

  #brand,
  #about,
  #history,
  #culture,
  #products,
  #advantages,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #sitemap,
  #contact,
  #team,
  #credentials {
    padding: 36px 28px;
  }
}

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

  section {
    padding: 36px 0;
  }

  main {
    padding: 0 16px;
  }

  nav[aria-label="主导航"] {
    padding: 0 12px;
  }

  nav[aria-label="主导航"] ul {
    padding: 8px 0;
    gap: 2px;
  }

  nav[aria-label="主导航"] a {
    padding: 7px 12px;
    font-size: 13px;
  }

  #hero {
    margin-top: 16px;
    padding: 36px 22px;
    border-radius: var(--radius-lg);
  }

  #hero > p {
    font-size: 0.95rem;
  }

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

  #brand,
  #about,
  #history,
  #culture,
  #products,
  #advantages,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #sitemap,
  #contact,
  #team,
  #credentials {
    padding: 28px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
  }

  h2 {
    padding-left: 16px;
    margin-bottom: 22px;
  }

  h2::before {
    width: 5px;
  }

  h3 {
    margin-top: 24px;
  }

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

  #reviews blockquote {
    padding: 18px 18px 18px 46px;
  }

  #reviews blockquote::before {
    left: 12px;
    font-size: 2.4rem;
  }

  #faq summary {
    padding: 15px 48px 15px 18px;
    font-size: 0.95rem;
  }

  #faq details > p {
    padding: 0 18px 16px;
  }

  #sitemap ul,
  footer ul {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
  }

  footer[role="contentinfo"] {
    padding: 40px 16px 24px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
}

@media (max-width: 380px) {
  #hero {
    padding: 28px 16px;
  }

  #brand,
  #about,
  #history,
  #culture,
  #products,
  #advantages,
  #solutions,
  #applications,
  #cases,
  #reviews,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #sitemap,
  #contact,
  #team,
  #credentials {
    padding: 22px 16px;
  }
}

/* ============ Reduced motion ============ */
@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;
  }
}

/* ============ Print ============ */
@media print {
  header[role="banner"],
  footer[role="contentinfo"] {
    display: none;
  }

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

  section {
    box-shadow: none;
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }
}