:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #ec4899;
  --accent: #06b6d4;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.25);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.78);
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.35);
  }
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  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;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(99, 102, 241, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 10%, rgba(236, 72, 153, 0.06), transparent),
    radial-gradient(ellipse 50% 60% at 50% 100%, rgba(6, 182, 212, 0.05), transparent);
  pointer-events: none;
  z-index: 0;
}

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

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

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

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

ul,
ol {
  list-style: none;
}

/* ===== HEADER ===== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  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-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

header:hover {
  box-shadow: var(--shadow-md);
}

nav[aria-label="主导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

nav[aria-label="主导航"] > a {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  letter-spacing: -0.02em;
  transition: opacity var(--transition), transform var(--transition);
}

nav[aria-label="主导航"] > a:hover {
  opacity: 0.85;
  transform: scale(1.03);
}

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

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

nav[aria-label="主导航"] ul li a {
  display: block;
  padding: 6px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  white-space: nowrap;
  transition: color var(--transition), background-color var(--transition), transform var(--transition);
}

nav[aria-label="主导航"] ul li a:hover {
  color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-1px);
}

/* ===== MAIN ===== */
main {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ===== BREADCRUMB ===== */
nav[aria-label="面包屑导航"] {
  padding: 20px 0 8px;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

nav[aria-label="面包屑导航"] ol li {
  display: flex;
  align-items: center;
  gap: 8px;
}

nav[aria-label="面包屑导航"] ol li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.5;
}

nav[aria-label="面包屑导航"] ol li a {
  color: var(--text-secondary);
  font-weight: 500;
}

nav[aria-label="面包屑导航"] ol li a:hover {
  color: var(--primary);
}

/* ===== H1 ===== */
h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 16px 0 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.7s ease-out both;
}

/* ===== SECTIONS ===== */
section {
  margin-bottom: 48px;
  animation: fadeInUp 0.6s ease-out both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

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

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

section > h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  padding-left: 18px;
  position: relative;
  color: var(--text);
}

section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 1.2em;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
}

section h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}

section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--primary);
}

section p {
  margin-bottom: 14px;
  color: var(--text-secondary);
  line-height: 1.85;
}

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

/* ===== INTRO SECTION ===== */
#intro {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

#intro::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

#intro h2 {
  padding-left: 0;
}

#intro h2::before {
  display: none;
}

/* ===== BRAND SECTION ===== */
#brand {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

/* ===== PRODUCTS SECTION ===== */
#products {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#products h4 {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.08));
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--primary);
  margin-top: 24px;
}

/* ===== SOLUTIONS SECTION ===== */
#solutions {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

/* ===== CASES SECTION ===== */
#cases {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#cases h3 {
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(6, 182, 212, 0.04));
  border-radius: var(--radius-md);
  border-left: 3px solid var(--primary);
  margin-top: 20px;
  transition: transform var(--transition), box-shadow var(--transition);
}

#cases h3:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

/* ===== NEWS SECTION ===== */
#news {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#news h3 {
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}

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

#news p:first-of-type {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* ===== ARTICLES SECTION ===== */
#articles {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#articles article {
  padding: 24px;
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

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

#articles article h3 {
  margin-top: 0;
  font-size: 1.1rem;
  transition: color var(--transition);
}

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

#articles article p:first-of-type {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 8px;
  transition: gap var(--transition), color var(--transition);
}

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

#articles article a:hover {
  gap: 8px;
  color: var(--primary-dark);
}

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

/* ===== FAQ SECTION ===== */
#faq {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#faq h3 {
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--border);
  font-size: 1.05rem;
  position: relative;
  padding-left: 28px;
  cursor: default;
  transition: color var(--transition);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 0;
  top: 16px;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#faq h3:hover {
  color: var(--primary);
}

#faq p {
  padding: 12px 0 12px 28px;
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* ===== HOWTO SECTION ===== */
#howto {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#howto h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  margin: 16px 0 8px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(6, 182, 212, 0.04));
  border-radius: var(--radius-md);
  border-left: 3px solid var(--primary);
  font-size: 1rem;
  color: var(--text);
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto h4:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

#howto h4::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  flex-shrink: 0;
}

/* ===== KNOWLEDGE SECTION ===== */
#knowledge {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.06), rgba(236, 72, 153, 0.04), rgba(6, 182, 212, 0.06));
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

/* ===== CONTACT SECTION ===== */
#contact {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#contact h3 {
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

#contact p {
  font-size: 0.9375rem;
}

/* ===== SITEMAP SECTION ===== */
#sitemap {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

#sitemap ul li a {
  display: block;
  padding: 10px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  transition: all var(--transition);
}

#sitemap ul li a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ===== LINKS SECTION ===== */
#links {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#links ul li a {
  display: inline-block;
  padding: 8px 20px;
  background: var(--bg);
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

#links ul li a:hover {
  color: var(--primary);
  border-color: var(--primary-light);
  background: rgba(99, 102, 241, 0.06);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ===== FOOTER ===== */
footer {
  position: relative;
  z-index: 1;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
  animation: none;
}

footer > section + section {
  border-top: 1px solid var(--border);
}

footer h2 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  padding-left: 0;
}

footer h2::before {
  display: none;
}

footer p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== SCROLL ANIMATION ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  main {
    padding: 0 20px 60px;
  }

  nav[aria-label="主导航"] {
    padding: 0 20px;
  }

  #intro,
  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #knowledge,
  #contact,
  #sitemap,
  #links {
    padding: 28px 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 56px;
  }

  body {
    font-size: 15px;
  }

  nav[aria-label="主导航"] {
    padding: 0 16px;
    gap: 10px;
  }

  nav[aria-label="主导航"] > a {
    font-size: 1.05rem;
  }

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

  nav[aria-label="主导航"] ul li a {
    padding: 5px 10px;
    font-size: 0.8125rem;
  }

  main {
    padding: 0 16px 48px;
  }

  h1 {
    margin: 12px 0 28px;
  }

  section {
    margin-bottom: 32px;
  }

  section > h2 {
    font-size: 1.25rem;
    margin-bottom: 18px;
    padding-left: 14px;
  }

  section > h2::before {
    width: 4px;
  }

  section h3 {
    font-size: 1.05rem;
    margin: 22px 0 10px;
  }

  #intro,
  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #knowledge,
  #contact,
  #sitemap,
  #links {
    padding: 22px 18px;
    border-radius: var(--radius-md);
  }

  #articles article {
    padding: 18px;
    border-radius: var(--radius-sm);
  }

  #articles article:hover {
    transform: translateY(-2px);
  }

  #faq h3 {
    font-size: 0.9375rem;
    padding-left: 26px;
    padding-top: 14px;
    padding-bottom: 10px;
  }

  #faq h3::before {
    top: 14px;
    width: 18px;
    height: 18px;
    font-size: 0.625rem;
  }

  #faq p {
    padding-left: 26px;
    font-size: 0.875rem;
  }

  #howto h4 {
    font-size: 0.9375rem;
    padding: 12px 14px;
  }

  #sitemap ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap ul li a {
    padding: 8px 12px;
    font-size: 0.8125rem;
  }

  #links ul {
    gap: 8px;
  }

  #links ul li a {
    padding: 6px 14px;
    font-size: 0.8125rem;
  }

  footer > section {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

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

  nav[aria-label="主导航"] > a {
    font-size: 0.95rem;
  }

  nav[aria-label="主导航"] ul li a {
    padding: 4px 8px;
    font-size: 0.75rem;
  }

  main {
    padding: 0 12px 40px;
  }

  h1 {
    font-size: 1.5rem;
    margin: 10px 0 22px;
  }

  section {
    margin-bottom: 24px;
  }

  section > h2 {
    font-size: 1.15rem;
    margin-bottom: 14px;
  }

  #intro,
  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #knowledge,
  #contact,
  #sitemap,
  #links {
    padding: 18px 14px;
  }

  #articles article {
    padding: 14px;
  }

  #sitemap ul {
    grid-template-columns: 1fr;
  }

  #links ul {
    flex-direction: column;
  }

  #links ul li a {
    text-align: center;
  }
}

/* ===== 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;
  }

  section {
    opacity: 1;
    transform: none;
  }
}

/* ===== PRINT ===== */
@media print {
  header,
  footer,
  nav[aria-label="面包屑导航"] {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  body::before {
    display: none;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

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

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}