:root {
  --primary: #e94560;
  --primary-light: #ff6b81;
  --primary-dark: #c23152;
  --accent: #0f3460;
  --accent-light: #1a4a7a;
  --bg: #f5f6fa;
  --bg-alt: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #7a7a9a;
  --border: rgba(26, 26, 46, 0.08);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.14);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --header-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d1a;
    --bg-alt: #14142b;
    --bg-card: rgba(26, 26, 46, 0.72);
    --bg-glass: rgba(20, 20, 43, 0.6);
    --text: #eaeaf2;
    --text-secondary: #b0b0c8;
    --text-muted: #7a7a9a;
    --border: rgba(255, 255, 255, 0.08);
    --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, 0.5);
  }
}

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

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

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

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-light);
}

ul {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  letter-spacing: -0.01em;
  margin-bottom: 1.2rem;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

h3 {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  margin-top: 1.6rem;
  margin-bottom: 0.6rem;
  color: var(--text);
}

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

time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== Header ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}

#site-header nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

#site-header nav > a {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary), var(--accent-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
  flex-shrink: 0;
  transition: transform var(--transition), filter var(--transition);
}

#site-header nav > a:hover {
  transform: scale(1.04);
  filter: brightness(1.15);
}

#site-header nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 4px 0;
}

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

#site-header nav ul li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#site-header nav ul li a:hover {
  background: rgba(233, 69, 96, 0.1);
  color: var(--primary);
  transform: translateY(-1px);
}

/* ===== Main layout ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

main > section {
  margin-bottom: 56px;
  animation: fadeUp 0.8s ease both;
}

main > section:nth-child(odd) {
  animation-delay: 0.05s;
}

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

@supports (animation-timeline: view()) {
  main > section {
    animation: fadeUp linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 40%;
  }
}

/* ===== Banner ===== */
#banner {
  position: relative;
  margin-top: 24px;
  padding: 48px 40px 40px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 75%, #e94560 140%);
  color: #fff;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.45), transparent 70%);
  pointer-events: none;
  animation: floatGlow 8s ease-in-out infinite alternate;
}

#banner::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 52, 96, 0.6), transparent 70%);
  pointer-events: none;
  animation: floatGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes floatGlow {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(-30px, 30px) scale(1.1); }
}

#banner h1 {
  position: relative;
  z-index: 2;
  color: #fff;
  margin-bottom: 1rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

#banner > p {
  position: relative;
  z-index: 2;
  max-width: 800px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1rem;
  margin-bottom: 2rem;
}

#banner .slides {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

#banner .slide {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#banner .slide:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  border-color: rgba(233, 69, 96, 0.5);
}

#banner .slide svg {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== Cards / Sections ===== */
#brand-intro,
#products,
#advantages,
#solutions,
#industries,
#cases,
#testimonials,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

#brand-intro:hover,
#products:hover,
#advantages:hover,
#solutions:hover,
#industries:hover,
#cases:hover,
#testimonials:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#faq:hover,
#howto:hover,
#contact:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.2);
}

/* ===== Articles & News ===== */
#news article,
#articles article {
  padding: 20px 22px;
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article:last-child,
#articles article:last-child {
  margin-bottom: 0;
}

#news article:hover,
#articles article:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--primary-light);
}

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

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(233, 69, 96, 0.1);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

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

#articles article a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}

#articles article a:hover::after {
  transform: translateX(3px);
}

/* ===== FAQ ===== */
#faq h3 {
  padding: 14px 18px;
  margin-top: 12px;
  margin-bottom: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.08), rgba(15, 52, 96, 0.06));
  border-left: 3px solid var(--primary);
  font-size: 1rem;
  cursor: default;
  transition: background var(--transition);
}

#faq h3:hover {
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.14), rgba(15, 52, 96, 0.1));
}

#faq h3 + p {
  padding: 14px 18px;
  margin-bottom: 12px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-top: none;
  font-size: 0.95rem;
}

/* ===== Testimonials ===== */
#testimonials h3 {
  margin-top: 1.4rem;
}

#testimonials h3 + p {
  position: relative;
  padding: 16px 20px 16px 48px;
  margin-bottom: 12px;
  border-radius: var(--radius-md);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-style: italic;
  color: var(--text-secondary);
  transition: transform var(--transition), box-shadow var(--transition);
}

#testimonials h3 + p::before {
  content: "\201C";
  position: absolute;
  left: 16px;
  top: 8px;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.4;
  font-family: Georgia, serif;
}

#testimonials h3 + p:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

/* ===== Sitemap & Links ===== */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

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

#sitemap ul li a:hover,
#links ul li a:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(233, 69, 96, 0.3);
}

/* ===== Contact ===== */
#contact p {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}

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

#contact h3 {
  margin-top: 1.8rem;
}

/* ===== Footer ===== */
footer {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-top: 1px solid var(--border);
  padding: 48px 24px 32px;
  margin-top: 24px;
}

footer > section {
  max-width: 1200px;
  margin: 0 auto 28px;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

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

footer > section h2 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}

footer > section h2::after {
  width: 36px;
  height: 3px;
}

footer > section p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

footer > p {
  max-width: 1200px;
  margin: 0 auto 8px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer > p a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 16px rgba(233, 69, 96, 0.3);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

footer > p a::before {
  content: "↑";
  font-size: 1rem;
}

footer > p a:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
  filter: brightness(1.1);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  #site-header nav {
    padding: 0 16px;
  }

  #site-header nav ul li a {
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  main {
    padding: 0 16px 48px;
  }

  #banner {
    padding: 32px 24px 28px;
    border-radius: var(--radius-lg);
  }

  #brand-intro,
  #products,
  #advantages,
  #solutions,
  #industries,
  #cases,
  #testimonials,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  #banner .slides {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 600px) {
  :root {
    --header-h: 56px;
  }

  body {
    font-size: 15px;
  }

  #site-header nav > a {
    font-size: 1.15rem;
  }

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

  #site-header nav ul li a {
    padding: 6px 8px;
    font-size: 0.8rem;
  }

  #banner {
    padding: 24px 16px 20px;
    border-radius: var(--radius-md);
    margin-top: 16px;
  }

  #banner h1 {
    font-size: 1.4rem;
  }

  #banner > p {
    font-size: 0.9rem;
  }

  main > section {
    margin-bottom: 36px;
  }

  #brand-intro,
  #products,
  #advantages,
  #solutions,
  #industries,
  #cases,
  #testimonials,
  #news,
  #articles,
  #knowledge,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    padding: 20px 16px;
  }

  h2 {
    font-size: 1.25rem;
  }

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

  #testimonials h3 + p {
    padding: 14px 16px 14px 40px;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 8px 10px;
    font-size: 0.82rem;
    text-align: center;
  }

  footer {
    padding: 32px 16px 24px;
  }

  footer > section {
    padding: 18px 16px;
  }
}

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

/* ===== Accessibility & 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;
  }
}

::selection {
  background: rgba(233, 69, 96, 0.3);
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 5px;
  border: 2px solid var(--bg);
}

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