:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #4a9af5;
  --accent: #ff6b35;
  --accent-dark: #e55a2b;
  --gradient-start: #1a73e8;
  --gradient-mid: #6c3ce0;
  --gradient-end: #ff6b35;
  --bg: #f5f7fb;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.5);
  --text: #1a1a2e;
  --text-secondary: #5a5a72;
  --text-muted: #8a8aa0;
  --border: #e2e6f0;
  --shadow-sm: 0 2px 8px rgba(26, 115, 232, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 115, 232, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 115, 232, 0.15);
  --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", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-card: #161b22;
    --bg-glass: rgba(22, 27, 34, 0.78);
    --bg-glass-border: rgba(255, 255, 255, 0.08);
    --text: #e6edf3;
    --text-secondary: #b1bac4;
    --text-muted: #7d8590;
    --border: #30363d;
    --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);
    --primary-light: #58a6ff;
  }
}

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

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

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

img {
  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(--accent);
}

ul, ol {
  list-style: none;
}

/* ========== HEADER / NAV ========== */
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(--bg-glass-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), background var(--transition);
}

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

header nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

header nav > a:first-child {
  font-size: 1.35rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
  white-space: nowrap;
  transition: transform var(--transition), filter var(--transition);
}

header nav > a:first-child:hover {
  transform: scale(1.05);
  filter: brightness(1.15);
  -webkit-text-fill-color: transparent;
}

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);
  position: relative;
  transition: all var(--transition);
}

header nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

header nav ul li a:hover {
  color: var(--primary);
  background: rgba(26, 115, 232, 0.06);
}

header nav ul li a:hover::after {
  width: 60%;
}

/* ========== MAIN ========== */
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

/* ========== BREADCRUMB ========== */
main > nav[aria-label="面包屑"] {
  padding: 16px 0;
}

main > nav[aria-label="面包屑"] ol {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

main > nav[aria-label="面包屑"] ol li:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
  opacity: 0.5;
}

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

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

/* ========== H1 BANNER ========== */
main > h1 {
  position: relative;
  margin: 8px 0 40px;
  padding: 56px 40px;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
  text-align: center;
  letter-spacing: -0.5px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
  box-shadow: 0 20px 60px rgba(26, 115, 232, 0.35);
  overflow: hidden;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

main > h1::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.18) 0%, transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.12) 0%, transparent 45%);
  animation: floatGlow 12s ease-in-out infinite;
  pointer-events: none;
}

main > h1::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  pointer-events: none;
}

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

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(3%, -3%) rotate(2deg); }
  66% { transform: translate(-2%, 2%) rotate(-2deg); }
}

/* ========== SECTIONS ========== */
main > section {
  margin-bottom: 40px;
  padding: 36px 32px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  opacity: 0;
  transform: translateY(24px);
  animation: fadeInUp 0.7s ease forwards;
}

main > section:nth-child(1) { animation-delay: 0.05s; }
main > section:nth-child(2) { animation-delay: 0.1s; }
main > section:nth-child(3) { animation-delay: 0.15s; }
main > section:nth-child(4) { animation-delay: 0.2s; }
main > section:nth-child(5) { animation-delay: 0.25s; }
main > section:nth-child(6) { animation-delay: 0.3s; }
main > section:nth-child(7) { animation-delay: 0.35s; }
main > section:nth-child(8) { animation-delay: 0.4s; }
main > section:nth-child(9) { animation-delay: 0.45s; }
main > section:nth-child(10) { animation-delay: 0.5s; }
main > section:nth-child(11) { animation-delay: 0.55s; }
main > section:nth-child(12) { animation-delay: 0.6s; }

main > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: rgba(26, 115, 232, 0.2);
}

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

/* ========== HEADINGS ========== */
main > section > h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 24px;
  padding-bottom: 12px;
  position: relative;
  letter-spacing: -0.3px;
}

main > section > h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin: 24px 0 12px;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin: 16px 0 8px;
}

p {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

/* ========== INTRO SECTION ========== */
#intro {
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.04), rgba(108, 60, 224, 0.04));
  border-left: 4px solid var(--primary);
}

/* ========== PRODUCTS ========== */
#products h4 {
  padding: 12px 16px;
  background: rgba(26, 115, 232, 0.05);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  transition: background var(--transition), transform var(--transition);
}

#products h4:hover {
  background: rgba(26, 115, 232, 0.1);
  transform: translateX(4px);
}

#products h4 + p {
  padding-left: 16px;
  margin-bottom: 16px;
}

/* ========== CASES / BLOCKQUOTE ========== */
blockquote {
  position: relative;
  margin: 16px 0;
  padding: 20px 24px 20px 56px;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.04), rgba(255, 107, 53, 0.04));
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
  transition: transform var(--transition), box-shadow var(--transition);
}

blockquote::before {
  content: '\201C';
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 3rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.25;
  font-family: Georgia, serif;
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

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

/* ========== NEWS & ARTICLES ========== */
#news article,
#articles article {
  padding: 20px 24px;
  margin-bottom: 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

#news article::before,
#articles article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--gradient-start), var(--gradient-end));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#news article:hover::before,
#articles article:hover::before {
  transform: scaleY(1);
}

#news article:hover,
#articles article:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: rgba(26, 115, 232, 0.2);
}

#news article h3,
#articles article h3 {
  margin-top: 0;
  font-size: 1.05rem;
  transition: color var(--transition);
}

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

#news article p:first-of-type,
#articles article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

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

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

#news article a:hover,
#articles article a:hover {
  color: var(--accent);
  gap: 8px;
}

#news article a:hover::after,
#articles article a:hover::after {
  transform: translateX(2px);
}

/* ========== FAQ ========== */
#faq dl {
  display: grid;
  gap: 12px;
}

#faq dt {
  font-weight: 600;
  color: var(--text);
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.06), rgba(108, 60, 224, 0.06));
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border-left: 3px solid var(--primary);
  cursor: default;
  transition: background var(--transition);
  position: relative;
}

#faq dt:hover {
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.1), rgba(108, 60, 224, 0.1));
}

#faq dd {
  padding: 14px 20px;
  margin-bottom: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.925rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#faq dd:hover {
  border-color: rgba(26, 115, 232, 0.2);
  box-shadow: var(--shadow-sm);
}

/* ========== HOWTO ========== */
#howto ol {
  counter-reset: howto;
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 16px 20px 16px 64px;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  color: var(--text-secondary);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto ol li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 115, 232, 0.25);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 6px 18px rgba(26, 115, 232, 0.45);
}

/* ========== CONTACT ========== */
#contact {
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.03), rgba(255, 107, 53, 0.03));
}

#contact p {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  transition: padding-left var(--transition);
}

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

#contact p:hover {
  padding-left: 8px;
}

/* ========== SITEMAP & LINKS ========== */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap ul li a,
#links ul li a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 50px;
  transition: all var(--transition);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.3);
}

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

footer > section {
  max-width: 1280px;
  margin: 0 auto 24px;
  padding: 0 24px;
}

footer > section > h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  padding-bottom: 6px;
  position: relative;
  display: inline-block;
}

footer > section > h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  border-radius: 2px;
  opacity: 0.5;
}

footer > section > p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.8;
}

footer > p:last-of-type {
  max-width: 1280px;
  margin: 32px auto 0;
  padding: 20px 24px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  header nav {
    padding: 0 16px;
  }

  header nav ul li a {
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 16px 40px;
  }

  main > h1 {
    padding: 44px 28px;
  }

  main > section {
    padding: 28px 24px;
  }
}

@media (max-width: 768px) {
  header nav {
    height: auto;
    flex-direction: column;
    padding: 12px 16px;
    gap: 8px;
  }

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

  header nav ul li a {
    padding: 6px 10px;
    font-size: 0.78rem;
  }

  main > h1 {
    padding: 36px 20px;
    font-size: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 28px;
  }

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

  main > section > h2 {
    font-size: 1.2rem;
  }

  blockquote {
    padding: 16px 16px 16px 44px;
  }

  blockquote::before {
    font-size: 2.2rem;
    left: 12px;
  }

  #howto ol li {
    padding: 14px 16px 14px 54px;
  }

  #howto ol li::before {
    width: 28px;
    height: 28px;
    left: 12px;
    font-size: 0.78rem;
  }

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

  footer > section {
    padding: 0 8px;
  }
}

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

  header nav ul {
    gap: 0;
  }

  header nav ul li a {
    padding: 5px 8px;
    font-size: 0.72rem;
  }

  main > h1 {
    padding: 28px 16px;
    font-size: 1.3rem;
  }

  main > section {
    padding: 20px 14px;
  }

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

  #faq dt {
    padding: 12px 14px;
    font-size: 0.9rem;
  }

  #faq dd {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}

/* ========== 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;
  }

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

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--gradient-start), var(--gradient-mid));
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--gradient-mid), var(--gradient-end));
}

/* ========== SELECTION ========== */
::selection {
  background: rgba(26, 115, 232, 0.2);
  color: var(--text);
}

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