:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #ec4899;
  --secondary-dark: #db2777;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --bg: #f8fafc;
  --bg-alt: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: rgba(148, 163, 184, 0.25);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.14);
  --shadow-xl: 0 24px 64px rgba(15, 23, 42, 0.18);
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 40%, #ec4899 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 35%, #4c1d95 70%, #831843 100%);
  --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.6) 100%);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-alt: #111827;
    --bg-card: rgba(30, 41, 59, 0.72);
    --bg-glass: rgba(30, 41, 59, 0.55);
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border: rgba(148, 163, 184, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.45);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.55);
    --gradient-card: linear-gradient(145deg, rgba(30,41,59,0.9) 0%, rgba(30,41,59,0.6) 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(236, 72, 153, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 10% 60%, rgba(6, 182, 212, 0.06), transparent);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary-dark), var(--secondary-dark));
}

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

a:hover {
  color: var(--secondary);
}

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

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

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  position: relative;
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  transition: width var(--transition-slow);
}

section:hover > h2::after {
  width: 96px;
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

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

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

header {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 4vw, 2rem) clamp(2.5rem, 6vw, 4rem);
  background: var(--gradient-hero);
  color: #f8fafc;
  overflow: hidden;
  isolation: isolate;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.4), transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(236, 72, 153, 0.3), transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(6, 182, 212, 0.25), transparent 50%);
  z-index: -1;
  animation: heroGlow 12s ease-in-out infinite alternate;
}

header::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: -1;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 80%);
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.08); }
}

header h1 {
  max-width: var(--max-width);
  margin: 0 auto 1.25rem;
  color: #ffffff;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

header > p {
  max-width: var(--max-width);
  margin: 0 auto 2rem;
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  line-height: 1.9;
  color: rgba(248, 250, 252, 0.85);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.15s both;
}

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

nav[aria-label="主导航"] {
  position: sticky;
  top: 0;
  z-index: 100;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.3s both;
  transition: box-shadow var(--transition), background var(--transition);
}

nav[aria-label="主导航"]:hover {
  box-shadow: var(--shadow-lg);
}

nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem;
}

nav[aria-label="主导航"] li {
  flex: 0 0 auto;
}

nav[aria-label="主导航"] a {
  display: block;
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: all var(--transition-fast);
  position: relative;
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  color: #ffffff;
  background: var(--gradient-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 2rem);
}

section {
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--gradient-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: sectionReveal 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
  animation-timeline: view();
  animation-range: entry 0% entry 60%;
}

@keyframes sectionReveal {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.3);
}

section ul,
section ol {
  margin-bottom: 1.25rem;
  padding-left: 0;
}

section ul li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.75rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

section ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

section ul li:hover {
  color: var(--text);
  transform: translateX(4px);
}

section ul li:hover::before {
  transform: scale(1.4);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.6);
}

section ol {
  counter-reset: step-counter;
  list-style: none;
}

section ol li {
  position: relative;
  padding: 0.6rem 0 0.6rem 2.75rem;
  color: var(--text-secondary);
  counter-increment: step-counter;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

section ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--gradient-primary);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

section ol li:hover {
  color: var(--text);
  transform: translateX(4px);
}

section ol li:hover::before {
  transform: scale(1.15);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.55);
}

article {
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

article:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.35);
}

article:hover::before {
  transform: scaleY(1);
}

article h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

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

article > p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
  transition: all var(--transition-fast);
}

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

article a:hover {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

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

#faq h3 {
  cursor: pointer;
  padding: 1rem 1.25rem;
  margin-top: 0.75rem;
  margin-bottom: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1.05rem;
  transition: all var(--transition);
  position: relative;
  padding-right: 3rem;
  user-select: none;
}

#faq h3::after {
  content: "+";
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform var(--transition), color var(--transition);
  line-height: 1;
}

#faq h3:hover {
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow);
  background: var(--bg-glass);
}

#faq h3:hover::after {
  transform: translateY(-50%) rotate(90deg);
}

#faq h3 + p {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  padding: 0 1.25rem;
  border: 1px solid transparent;
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: max-height var(--transition-slow), opacity var(--transition), padding var(--transition), margin var(--transition);
}

#faq h3:focus + p,
#faq h3:active + p {
  max-height: 500px;
  opacity: 1;
  padding: 1rem 1.25rem;
  margin-top: -0.25rem;
  background: var(--bg-card);
  border-color: var(--border);
}

#faq h3:focus::after,
#faq h3:active::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

#news ul li {
  padding: 0.75rem 0 0.75rem 2rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-fast), padding-left var(--transition-fast);
}

#news ul li:last-child {
  border-bottom: none;
}

#news ul li::before {
  top: 1.3rem;
  width: 10px;
  height: 10px;
  background: var(--gradient-accent);
}

#news ul li:hover {
  background: rgba(99, 102, 241, 0.05);
  padding-left: 2.5rem;
  border-radius: var(--radius-sm);
}

#news strong {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  margin-right: 0.5rem;
  letter-spacing: 0.02em;
}

#contact ul li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.6rem 0 0.6rem 1.75rem;
  border-bottom: 1px dashed var(--border);
}

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

#contact ul li::before {
  top: 1.15rem;
  background: var(--gradient-accent);
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}

#sitemap ul li {
  padding: 0.5rem 0 0.5rem 1.75rem;
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#links ul li {
  padding: 0;
}

#links ul li::before {
  display: none;
}

#links a {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

#links a:hover {
  color: #ffffff;
  background: var(--gradient-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

#updates ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#updates ul li {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
}

#updates ul li::before {
  display: none;
}

#updates ul li:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

footer {
  position: relative;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 4vw, 2rem);
  background: var(--gradient-hero);
  color: rgba(248, 250, 252, 0.8);
  text-align: center;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(99, 102, 241, 0.25), transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(236, 72, 153, 0.2), transparent 50%);
  pointer-events: none;
}

footer p {
  position: relative;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: rgba(248, 250, 252, 0.75);
}

footer p:first-child {
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

footer p:last-child {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(248, 250, 252, 0.12);
  font-size: 0.8rem;
  color: rgba(248, 250, 252, 0.5);
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  body {
    font-size: 15px;
  }

  header {
    padding: 2.5rem 1rem 2rem;
  }

  nav[aria-label="主导航"] {
    border-radius: var(--radius);
    padding: 0.5rem;
    margin: 0 0.5rem;
  }

  nav[aria-label="主导航"] ul {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    gap: 0.25rem;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: 2px;
  }

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

  nav[aria-label="主导航"] a {
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
  }

  main {
    padding: 1.5rem 0.75rem;
  }

  section {
    padding: 1.25rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 2rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  h2::after {
    width: 48px;
    height: 3px;
  }

  article {
    padding: 1.15rem;
  }

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

  #links ul {
    gap: 0.5rem;
  }

  #links a {
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
  }

  #faq h3 {
    padding: 0.85rem 1rem;
    padding-right: 2.5rem;
    font-size: 0.95rem;
  }

  #faq h3::after {
    right: 1rem;
    font-size: 1.2rem;
  }

  #faq h3 + p {
    padding: 0 1rem;
  }

  #faq h3:focus + p,
  #faq h3:active + p {
    padding: 0.85rem 1rem;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 1.5rem;
  }

  header > p {
    font-size: 0.9rem;
    line-height: 1.8;
  }

  section h2 {
    font-size: 1.2rem;
  }

  h3 {
    font-size: 1.05rem;
  }

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

  #updates ul li {
    font-size: 0.78rem;
    padding: 0.4rem 0.8rem;
  }

  section ul li {
    padding-left: 1.5rem;
    font-size: 0.9rem;
  }

  section ol li {
    padding-left: 2.25rem;
    font-size: 0.9rem;
  }

  section ol li::before {
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
    top: 0.7rem;
  }
}

@media (hover: none) {
  section:hover {
    transform: none;
    box-shadow: var(--shadow);
  }

  article:hover {
    transform: none;
  }

  nav[aria-label="主导航"] a:hover {
    transform: none;
  }
}

@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;
  }

  header::before {
    animation: none;
  }
}

@media print {
  header,
  nav,
  footer {
    background: none;
    color: #000;
  }

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

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