:root {
  --brand-primary: #6c5ce7;
  --brand-secondary: #a29bfe;
  --brand-accent: #fd79a8;
  --brand-warm: #fdcb6e;
  --brand-cool: #74b9ff;
  --bg-body: #f5f6fa;
  --bg-card: #ffffff;
  --bg-card-hover: #fafbff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.45);
  --bg-header: rgba(255, 255, 255, 0.82);
  --bg-code: #f0f1f6;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --text-muted: #b2bec3;
  --text-inverse: #ffffff;
  --border-color: #e8eaf0;
  --border-light: #f0f1f6;
  --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.06);
  --shadow-md: 0 4px 20px rgba(108, 92, 231, 0.10);
  --shadow-lg: 0 8px 40px rgba(108, 92, 231, 0.14);
  --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.18);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --gradient-brand: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 50%, #fd79a8 100%);
  --gradient-banner: linear-gradient(135deg, #2c3e50 0%, #6c5ce7 40%, #a29bfe 70%, #fd79a8 100%);
  --gradient-warm: linear-gradient(135deg, #fdcb6e 0%, #fd79a8 100%);
  --gradient-cool: linear-gradient(135deg, #74b9ff 0%, #6c5ce7 100%);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Consolas, monospace;
  --max-width: 1200px;
  --header-height: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-body: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #1f1f38;
    --bg-glass: rgba(26, 26, 46, 0.78);
    --bg-glass-border: rgba(108, 92, 231, 0.18);
    --bg-header: rgba(15, 15, 26, 0.85);
    --bg-code: #16162a;
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #5a5a78;
    --text-inverse: #ffffff;
    --border-color: #2a2a45;
    --border-light: #1f1f38;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.45);
    --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.25);
    --gradient-brand: linear-gradient(135deg, #6c5ce7 0%, #8b7cf7 50%, #fd79a8 100%);
    --gradient-banner: linear-gradient(135deg, #0f0f1a 0%, #1a1a3e 30%, #2d1b69 60%, #6c5ce7 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: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

::selection {
  background: rgba(108, 92, 231, 0.25);
  color: var(--text-primary);
}

body::-webkit-scrollbar {
  width: 8px;
}

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

body::-webkit-scrollbar-thumb {
  background: var(--brand-secondary);
  border-radius: 4px;
}

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

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: background var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

header[role="banner"]:hover {
  box-shadow: var(--shadow-md);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  min-height: var(--header-height);
  padding: 8px 0;
}

header nav ul li {
  flex-shrink: 0;
}

header nav ul li a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
  position: relative;
}

header nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 1px;
  transform: translateX(-50%);
  transition: width var(--transition-smooth);
}

header nav ul li a:hover {
  color: var(--brand-primary);
  background: rgba(108, 92, 231, 0.08);
  transform: translateY(-1px);
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 60px;
}

section {
  margin-bottom: 48px;
  padding: 36px 32px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-smooth), transform var(--transition-smooth), background var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

section:hover::before {
  opacity: 1;
}

#brand {
  background: var(--gradient-banner);
  color: var(--text-inverse);
  border: none;
  padding: 60px 40px;
  margin-top: 32px;
  position: relative;
  overflow: hidden;
}

#brand::before {
  display: none;
}

#brand::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatOrb 12s ease-in-out infinite;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 20px) scale(1.1); }
}

#brand h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
  position: relative;
  z-index: 1;
}

#brand p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 16px;
  max-width: 800px;
  position: relative;
  z-index: 1;
}

#brand figure {
  margin-top: 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  z-index: 1;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

#brand figure:hover {
  transform: scale(1.015);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.35);
}

#brand figure svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

#brand figcaption {
  padding: 12px 16px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  padding-bottom: 14px;
  position: relative;
  letter-spacing: -0.01em;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 4px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transition: width var(--transition-smooth);
}

section:hover h2::after {
  width: 80px;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--brand-primary);
  margin: 28px 0 12px;
  padding-left: 14px;
  position: relative;
  letter-spacing: -0.005em;
}

h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background: var(--gradient-brand);
  border-radius: 2px;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 10px;
  padding-left: 12px;
  border-left: 3px solid var(--brand-secondary);
}

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

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

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

a:hover {
  color: var(--brand-accent);
}

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

ul, ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 6px;
  color: var(--text-secondary);
  line-height: 1.75;
}

blockquote {
  margin: 20px 0;
  padding: 20px 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-left: 4px solid var(--brand-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  position: relative;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
  border-left-color: var(--brand-accent);
}

blockquote p {
  font-style: italic;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.8;
}

blockquote footer {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: normal;
  font-weight: 500;
}

article {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: padding-left var(--transition-smooth), background var(--transition-smooth);
  border-radius: var(--radius-sm);
}

article:last-child {
  border-bottom: none;
}

article:hover {
  padding-left: 8px;
}

article h3 {
  margin-top: 0;
}

article time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

article p {
  font-size: 0.95rem;
}

article a {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background: rgba(108, 92, 231, 0.08);
  transition: background var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

article a:hover {
  background: var(--brand-primary);
  color: var(--text-inverse);
  transform: translateX(4px);
}

address {
  font-style: normal;
  padding: 20px 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin-bottom: 20px;
  transition: box-shadow var(--transition-smooth);
}

address:hover {
  box-shadow: var(--shadow-sm);
}

address p {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

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

#faq h3 {
  font-size: 1.05rem;
  margin-top: 24px;
  padding: 12px 16px;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--brand-secondary);
  transition: background var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
  cursor: default;
}

#faq h3:hover {
  background: rgba(108, 92, 231, 0.08);
  transform: translateX(4px);
  border-left-color: var(--brand-primary);
}

#faq h3::before {
  display: none;
}

#faq p {
  padding: 0 16px 8px;
  font-size: 0.93rem;
}

#howto h3 {
  margin-top: 32px;
}

#howto h4 {
  margin-top: 24px;
  font-size: 0.98rem;
  color: var(--brand-primary);
  border-left-color: var(--brand-accent);
}

#howto p {
  font-size: 0.93rem;
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
  list-style: none;
  padding-left: 0;
}

#sitemap ul li a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-light);
  font-size: 0.88rem;
  font-weight: 500;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

#sitemap ul li a:hover {
  background: var(--gradient-brand);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  list-style: none;
  padding-left: 0;
}

#links ul li a {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 50px;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-light);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}

#links ul li a:hover {
  background: var(--gradient-cool);
  color: var(--text-inverse);
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--shadow-md);
}

#legal h2 {
  margin-top: 32px;
}

#legal h2:first-child {
  margin-top: 0;
}

#author {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-glass-border);
}

#author p {
  font-size: 0.92rem;
}

footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 40px;
  text-align: center;
  border-top: 1px solid var(--border-light);
  transition: border-color var(--transition-smooth);
}

footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.6;
}

footer a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.3);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(108, 92, 231, 0);
  }
}

section {
  animation: fadeInUp 0.6s ease-out 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; }
section:nth-child(10) { animation-delay: 0.5s; }
section:nth-child(11) { animation-delay: 0.55s; }
section:nth-child(12) { animation-delay: 0.6s; }
section:nth-child(13) { animation-delay: 0.65s; }
section:nth-child(14) { animation-delay: 0.7s; }
section:nth-child(15) { animation-delay: 0.75s; }
section:nth-child(16) { animation-delay: 0.8s; }
section:nth-child(17) { animation-delay: 0.85s; }
section:nth-child(18) { animation-delay: 0.9s; }

@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;
  }
}

@media (max-width: 1024px) {
  :root {
    --max-width: 100%;
  }

  #brand h1 {
    font-size: 2rem;
  }

  section {
    padding: 28px 24px;
  }

  #brand {
    padding: 48px 28px;
  }
}

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

  body {
    font-size: 15px;
  }

  header nav {
    padding: 0 16px;
  }

  header nav ul {
    gap: 2px;
    padding: 6px 0;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  header nav ul li a {
    padding: 5px 10px;
    font-size: 12px;
  }

  main {
    padding: 0 16px 40px;
  }

  section {
    padding: 24px 18px;
    margin-bottom: 32px;
    border-radius: var(--radius-md);
  }

  #brand {
    padding: 36px 20px;
    margin-top: 20px;
    border-radius: var(--radius-md);
  }

  #brand h1 {
    font-size: 1.5rem;
    margin-bottom: 16px;
  }

  #brand p {
    font-size: 0.95rem;
  }

  h2 {
    font-size: 1.3rem;
    margin-bottom: 18px;
    padding-bottom: 12px;
  }

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

  h4 {
    font-size: 0.95rem;
  }

  p {
    font-size: 0.93rem;
    line-height: 1.8;
  }

  blockquote {
    padding: 16px 18px;
    margin: 16px 0;
  }

  blockquote p {
    font-size: 0.9rem;
  }

  article {
    padding: 16px 0;
  }

  #sitemap ul {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 6px;
  }

  #sitemap ul li a {
    padding: 6px 10px;
    font-size: 0.82rem;
  }

  #links ul {
    gap: 8px;
  }

  #links ul li a {
    padding: 6px 14px;
    font-size: 0.84rem;
  }

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

  footer p {
    font-size: 0.78rem;
  }

  address {
    padding: 16px 18px;
  }

  #faq h3 {
    font-size: 0.95rem;
    padding: 10px 12px;
  }

  #faq p {
    padding: 0 12px 6px;
    font-size: 0.88rem;
  }
}

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

  #brand h1 {
    font-size: 1.25rem;
  }

  #brand {
    padding: 28px 16px;
  }

  section {
    padding: 20px 14px;
    margin-bottom: 24px;
  }

  h2 {
    font-size: 1.15rem;
  }

  h3 {
    font-size: 0.98rem;
  }

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

  #links ul {
    flex-direction: column;
  }

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

@media print {
  header[role="banner"],
  footer {
    display: none;
  }

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

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

  #brand {
    background: #f5f5f5 !important;
    color: #000 !important;
  }

  #brand h1,
  #brand p {
    color: #000 !important;
  }

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