:root {
  --primary: #ff5a3c;
  --primary-dark: #e63e1f;
  --primary-light: #ff8a6c;
  --secondary: #7c3aed;
  --secondary-light: #a78bfa;
  --accent: #06b6d4;
  --bg: #faf8f6;
  --bg-alt: #f0ece8;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-border: rgba(255, 255, 255, 0.5);
  --text: #1a1614;
  --text-secondary: #5c5550;
  --text-muted: #8a827c;
  --border: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 8px 32px rgba(255, 90, 60, 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);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #ff6b4a;
    --primary-dark: #ff5a3c;
    --primary-light: #ff9a80;
    --secondary: #a78bfa;
    --secondary-light: #c4b5fd;
    --accent: #22d3ee;
    --bg: #0f0d0c;
    --bg-alt: #1a1715;
    --surface: #1e1b19;
    --surface-glass: rgba(30, 27, 25, 0.78);
    --surface-glass-border: rgba(255, 255, 255, 0.08);
    --text: #f5f0ec;
    --text-secondary: #b8b0aa;
    --text-muted: #7a726c;
    --border: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 8px 32px rgba(255, 107, 74, 0.3);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

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

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

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

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

ul {
  list-style: none;
}

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

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface-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);
}

header nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

header nav > a:first-child {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  transition: opacity var(--transition);
}

header nav > a:first-child:hover {
  opacity: 0.85;
}

header nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

header nav ul li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

header nav ul li a:hover {
  color: var(--primary);
  background: rgba(255, 90, 60, 0.08);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 64px 0;
  scroll-margin-top: 80px;
}

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

section#home {
  padding: 80px 0 72px;
  text-align: center;
  position: relative;
}

section#home::before {
  content: "";
  position: absolute;
  top: -64px;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: calc(100% + 64px);
  background: linear-gradient(135deg, rgba(255, 90, 60, 0.08) 0%, rgba(124, 58, 237, 0.06) 50%, rgba(6, 182, 212, 0.05) 100%);
  z-index: -1;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

section#home h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

section#home p {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

section h2 {
  font-size: clamp(1.375rem, 3.5vw, 1.875rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  position: relative;
  padding-bottom: 16px;
}

section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

section h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}

section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

section p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 12px;
}

section#about,
section#products,
section#solutions,
section#cases,
section#news,
section#articles,
section#howto,
section#faq,
section#contact,
section#sitemap,
section#links,
section#privacy,
section#disclaimer,
section#copyright,
section#author {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin: 24px 0;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
}

section#about:hover,
section#products:hover,
section#solutions:hover,
section#cases:hover,
section#news:hover,
section#articles:hover,
section#howto:hover,
section#faq:hover,
section#contact:hover,
section#sitemap:hover,
section#links:hover,
section#privacy:hover,
section#disclaimer:hover,
section#copyright:hover,
section#author:hover {
  box-shadow: var(--shadow-md);
}

section#about + section,
section#products + section,
section#solutions + section,
section#cases + section,
section#news + section,
section#articles + section,
section#howto + section,
section#faq + section,
section#contact + section,
section#sitemap + section,
section#links + section,
section#privacy + section,
section#disclaimer + section,
section#copyright + section,
section#author + section {
  border-top: none;
}

section#cases p {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  border-left: 3px solid var(--primary);
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
}

section#cases p:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

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

section#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 90, 60, 0.2);
}

section#articles article h3 {
  margin-top: 0;
  font-size: 1.0625rem;
  color: var(--text);
}

section#articles article p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

section#articles article p:last-child {
  margin-bottom: 0;
  margin-top: 12px;
}

section#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(255, 90, 60, 0.08);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

section#articles article a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateX(4px);
}

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

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

section#howto h3 {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, rgba(255, 90, 60, 0.1), rgba(124, 58, 237, 0.08));
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 24px;
  margin-bottom: 12px;
}

section#howto h3:first-of-type {
  margin-top: 0;
}

section#faq h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 24px;
  margin-bottom: 8px;
  padding-left: 16px;
  border-left: 3px solid var(--primary);
  transition: border-color var(--transition);
}

section#faq h3:hover {
  border-left-color: var(--secondary);
}

section#faq h3:first-of-type {
  margin-top: 0;
}

section#contact p {
  font-size: 0.9375rem;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 0;
}

section#contact p:last-of-type {
  border-bottom: none;
}

section#contact p a {
  font-weight: 500;
}

section#sitemap ul,
section#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
}

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

section#sitemap ul li a:hover,
section#links ul li a:hover {
  color: var(--primary);
  background: rgba(255, 90, 60, 0.06);
  border-color: rgba(255, 90, 60, 0.2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

section#privacy p,
section#disclaimer p,
section#copyright p,
section#author p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.8;
}

section#copyright p:first-child {
  font-weight: 600;
  color: var(--text-secondary);
}

footer {
  max-width: 1200px;
  margin: 48px auto 0;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1.7;
}

footer p:first-child {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

footer a {
  color: var(--primary);
  font-weight: 500;
  transition: color var(--transition);
}

footer a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  animation: fadeInUp 0.6s ease both;
}

section:nth-child(1) { animation-delay: 0.05s; }
section:nth-child(2) { animation-delay: 0.1s; }
section:nth-child(3) { animation-delay: 0.15s; }
section:nth-child(4) { animation-delay: 0.2s; }
section:nth-child(5) { animation-delay: 0.25s; }
section:nth-child(6) { animation-delay: 0.3s; }
section:nth-child(7) { animation-delay: 0.35s; }
section:nth-child(8) { animation-delay: 0.4s; }
section:nth-child(9) { animation-delay: 0.45s; }

@media (max-width: 900px) {
  header nav {
    flex-direction: column;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }

  header nav ul {
    justify-content: center;
    gap: 2px;
  }

  header nav ul li a {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }

  main {
    padding: 0 16px;
  }

  section {
    padding: 40px 0;
  }

  section#home {
    padding: 48px 0 40px;
  }

  section#home::before {
    top: -48px;
    height: calc(100% + 48px);
  }

  section#about,
  section#products,
  section#solutions,
  section#cases,
  section#news,
  section#articles,
  section#howto,
  section#faq,
  section#contact,
  section#sitemap,
  section#links,
  section#privacy,
  section#disclaimer,
  section#copyright,
  section#author {
    padding: 28px 20px;
    border-radius: var(--radius-md);
    margin: 16px 0;
  }

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

  footer {
    padding: 32px 16px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  header nav > a:first-child {
    font-size: 1.125rem;
  }

  header nav ul li a {
    padding: 5px 8px;
    font-size: 0.75rem;
  }

  section#home h1 {
    font-size: 1.5rem;
  }

  section#home p {
    font-size: 0.9375rem;
  }

  section h2 {
    font-size: 1.25rem;
  }

  section h3 {
    font-size: 1rem;
  }

  section#articles article {
    padding: 18px 16px;
  }

  section#contact p {
    font-size: 0.875rem;
    flex-direction: column;
    gap: 2px;
  }

  section#sitemap ul,
  section#links ul {
    grid-template-columns: repeat(2, 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;
  }
}

@supports not (backdrop-filter: blur(20px)) {
  header {
    background: var(--surface);
  }
}

@media print {
  header {
    position: static;
    background: none;
    backdrop-filter: none;
  }

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

  section#home::before {
    display: none;
  }
}