:root {
  --color-primary: #e63946;
  --color-primary-dark: #c1121f;
  --color-primary-light: #ff6b81;
  --color-secondary: #f4a261;
  --color-accent: #2a9d8f;
  --color-deep: #264653;
  --color-bg: #fffaf9;
  --color-bg-alt: #fff5f5;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-border: rgba(230, 57, 70, 0.14);
  --color-text: #2b2b33;
  --color-text-soft: #5a5a66;
  --color-text-muted: #8a8a96;
  --color-heading: #1f1f28;
  --color-link: #c1121f;
  --color-link-hover: #e63946;
  --shadow-sm: 0 2px 8px rgba(38, 70, 83, 0.06);
  --shadow-md: 0 8px 24px rgba(38, 70, 83, 0.1);
  --shadow-lg: 0 18px 48px rgba(38, 70, 83, 0.16);
  --shadow-glow: 0 0 0 4px rgba(230, 57, 70, 0.12);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --gradient-banner: linear-gradient(135deg, #e63946 0%, #f4a261 48%, #2a9d8f 100%);
  --gradient-soft: linear-gradient(135deg, rgba(230, 57, 70, 0.08), rgba(42, 157, 143, 0.08));
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --content-width: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12141a;
    --color-bg-alt: #171a22;
    --color-surface: #1c1f28;
    --color-surface-glass: rgba(28, 31, 40, 0.72);
    --color-border: rgba(255, 107, 129, 0.18);
    --color-text: #e6e6ec;
    --color-text-soft: #b4b4c0;
    --color-text-muted: #85858f;
    --color-heading: #f4f4f8;
    --color-link: #ff8595;
    --color-link-hover: #ffb3bd;
    --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 18px 48px rgba(0, 0, 0, 0.55);
    --shadow-glow: 0 0 0 4px rgba(255, 107, 129, 0.18);
    --gradient-soft: linear-gradient(135deg, rgba(230, 57, 70, 0.16), rgba(42, 157, 143, 0.16));
  }
}

*,
*::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(230, 57, 70, 0.06),
      transparent 42%
    ),
    radial-gradient(circle at 88% 18%, rgba(42, 157, 143, 0.06), transparent 40%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

h1,
h2,
h3,
h4 {
  color: var(--color-heading);
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--gradient-banner);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin-top: 1.4em;
}

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: 0.4em;
}

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

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  background: var(--gradient-soft);
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 0.6em;
  letter-spacing: 0.02em;
}

blockquote {
  margin: 0 0 1.2em;
  padding: 18px 22px;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

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

figure {
  margin: 2em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--color-surface);
}

figcaption {
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-surface);
}

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.brand-bar {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 16px 24px 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
}

.brand-bar a {
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--gradient-banner);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  transition: filter var(--transition-fast);
}

.brand-bar a:hover {
  filter: brightness(1.15) saturate(1.2);
}

.brand-bar p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

header nav[role="navigation"] {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

header nav[role="navigation"] > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

header nav[role="navigation"] > ul li {
  margin: 0;
}

header nav[role="navigation"] > ul a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  border-radius: var(--radius-pill);
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

header nav[role="navigation"] > ul a:hover,
header nav[role="navigation"] > ul a:focus-visible {
  background: var(--gradient-soft);
  color: var(--color-primary);
  transform: translateY(-1px);
}

form[role="search"] {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 1 auto;
}

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

form[role="search"] input[type="search"] {
  width: clamp(160px, 26vw, 260px);
  padding: 8px 16px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast);
}

form[role="search"] input[type="search"]::placeholder {
  color: var(--color-text-muted);
}

form[role="search"] input[type="search"]:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  background: var(--color-surface);
  outline: none;
}

form[role="search"] button {
  padding: 8px 20px;
  font-size: 0.88rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-banner);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.32);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    filter var(--transition-fast);
}

form[role="search"] button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(230, 57, 70, 0.42);
  filter: brightness(1.06);
}

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

main {
  display: block;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

main > section {
  margin: 48px 0;
  padding: 36px clamp(20px, 4vw, 48px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  animation: fadeUp var(--transition-slow) both;
  animation-timeline: view();
  animation-range: entry 0% entry 60%;
}

main > section:hover {
  box-shadow: var(--shadow-md);
}

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

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(36px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#hero {
  position: relative;
  margin-top: 32px;
  padding: clamp(32px, 6vw, 64px) clamp(22px, 5vw, 56px);
  background: var(--gradient-banner);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  color: #fff;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      circle at 18% 20%,
      rgba(255, 255, 255, 0.28),
      transparent 46%
    ),
    radial-gradient(circle at 82% 78%, rgba(255, 255, 255, 0.18), transparent 44%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -12%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  filter: blur(8px);
  pointer-events: none;
  animation: floatSlow 9s ease-in-out infinite;
}

@keyframes floatSlow {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-24px, 20px) scale(1.08);
  }
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  color: #fff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.18);
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  max-width: 60ch;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.12);
}

#hero figure {
  background: rgba(255, 255, 255, 0.14);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow: none;
}

#hero figcaption {
  background: rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.92);
}

#hero nav[aria-label="页面锚点导航"] ul {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#hero nav[aria-label="页面锚点导航"] li {
  margin: 0;
}

#hero nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.82rem;
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-pill);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

#hero nav[aria-label="页面锚点导航"] a:hover {
  background: rgba(255, 255, 255, 0.32);
  transform: translateY(-2px);
  color: #fff;
}

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

nav[aria-label="面包屑导航"] ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: flex;
  align-items: center;
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-text-muted);
  opacity: 0.6;
}

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);
}

#products,
#advantages,
#solutions,
#applications,
#cases,
#reviews,
#news,
#articles,
#knowledge,
#faq,
#howto {
  background: var(--color-surface);
}

#products h3,
#advantages h3,
#solutions h3,
#applications h3,
#cases h3,
#culture h3,
#knowledge h3,
#howto h3 {
  padding-left: 14px;
  border-left: 3px solid var(--color-secondary);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

#products h3:hover,
#advantages h3:hover,
#solutions h3:hover,
#applications h3:hover,
#cases h3:hover,
#culture h3:hover,
#knowledge h3:hover,
#howto h3:hover {
  border-color: var(--color-primary);
  transform: translateX(4px);
}

#articles article,
#news article {
  position: relative;
  margin: 0 0 20px;
  padding: 24px 26px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base), background var(--transition-base);
}

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

#articles article:hover,
#news article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(230, 57, 70, 0.3);
  background: var(--color-surface);
}

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

#articles article h3,
#news article h3 {
  margin-top: 0;
  font-size: 1.12rem;
  transition: color var(--transition-fast);
}

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

#articles article a[href^="#article"] {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--gradient-soft);
  border: 1px solid var(--color-border);
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

#articles article a[href^="#article"]::after {
  content: "→";
  transition: transform var(--transition-fast);
}

#articles article a[href^="#article"]:hover {
  background: var(--gradient-banner);
  color: #fff;
  transform: translateX(2px);
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.3);
}

#articles article a[href^="#article"]:hover::after {
  transform: translateX(4px);
}

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

#faq details[open] {
  background: var(--color-surface);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-sm);
}

#faq details:hover {
  border-color: rgba(230, 57, 70, 0.28);
}

#faq summary {
  position: relative;
  padding: 16px 52px 16px 22px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-heading);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-primary);
  background: var(--gradient-soft);
  border-radius: 50%;
  transition: transform var(--transition-base), background var(--transition-base),
    color var(--transition-base);
}

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

#faq summary:hover {
  color: var(--color-primary);
}

#faq details p {
  padding: 0 22px 18px;
  margin: 0;
  animation: fadeIn var(--transition-base) both;
}

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

#howto ol,
#howto ul {
  padding-left: 1.5em;
}

#howto ol li,
#howto ul li {
  padding-left: 4px;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

#howto ol li:hover,
#howto ul li:hover {
  color: var(--color-primary);
  transform: translateX(3px);
}

#contact ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

#contact ul li {
  margin: 0;
  padding: 14px 18px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--color-text-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

#contact ul li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(230, 57, 70, 0.3);
}

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

#sitemap ul li,
#links ul li {
  margin: 0;
}

#sitemap ul a,
#links ul a {
  display: block;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--color-text-soft);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap ul a:hover,
#links ul a:hover {
  background: var(--gradient-banner);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(230, 57, 70, 0.28);
}

#legal h3,
#eeat h3 {
  color: var(--color-primary-dark);
}

#eeat ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

#eeat ul li {
  margin: 0;
  padding: 10px 16px;
  font-size: 0.88rem;
  color: var(--color-text-soft);
  background: var(--gradient-soft);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

footer[role="contentinfo"] {
  margin-top: 64px;
  padding: 48px 24px 40px;
  background: linear-gradient(180deg, transparent, rgba(38, 70, 83, 0.06));
  border-top: 1px solid var(--color-border);
  text-align: center;
}

footer[role="contentinfo"] p {
  max-width: var(--content-width);
  margin: 0 auto 10px;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

footer[role="contentinfo"] a {
  color: var(--color-text-soft);
  font-weight: 500;
}

footer[role="contentinfo"] a:hover {
  color: var(--color-primary);
}

@media (max-width: 900px) {
  header nav[role="navigation"] {
    flex-direction: column;
    align-items: stretch;
  }

  header nav[role="navigation"] > ul {
    justify-content: center;
  }

  form[role="search"] {
    justify-content: center;
  }

  form[role="search"] input[type="search"] {
    width: 100%;
    max-width: 320px;
  }
}

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

  .brand-bar {
    padding: 12px 16px 6px;
    flex-direction: column;
    gap: 2px;
  }

  header nav[role="navigation"] {
    padding: 0 16px 12px;
  }

  header nav[role="navigation"] > ul {
    gap: 2px;
  }

  header nav[role="navigation"] > ul a {
    padding: 5px 10px;
    font-size: 0.82rem;
  }

  main {
    padding: 0 14px;
  }

  main > section {
    margin: 28px 0;
    padding: 24px 18px;
    border-radius: var(--radius-md);
  }

  #hero {
    margin-top: 20px;
    padding: 28px 20px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 4px;
  }

  nav[aria-label="面包屑导航"] {
    padding: 0 16px;
  }

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

  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.92rem;
  }

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

  form[role="search"] button {
    padding: 8px 16px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

@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 {
  header[role="banner"],
  footer[role="contentinfo"],
  #hero nav,
  form[role="search"] {
    display: none;
  }

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

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