:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(30, 30, 50, 0.72);
  --bg-card-hover: rgba(40, 40, 65, 0.85);
  --bg-glass: rgba(26, 26, 46, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text-primary: #eaeaf0;
  --text-secondary: #a0a0b8;
  --text-muted: #6c6c85;
  --accent-start: #e94560;
  --accent-mid: #903749;
  --accent-end: #533483;
  --accent-glow: rgba(233, 69, 96, 0.35);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 35%, #533483 70%, #e94560 100%);
  --gradient-accent: linear-gradient(135deg, #e94560, #533483);
  --gradient-card: linear-gradient(145deg, rgba(30, 30, 50, 0.8), rgba(20, 20, 40, 0.6));
  --gradient-nav: linear-gradient(180deg, rgba(15, 15, 26, 0.95), rgba(15, 15, 26, 0.78));
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.2);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --blur-sm: 8px;
  --blur-md: 16px;
  --blur-lg: 24px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --max-width: 1200px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.78);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --bg-glass: rgba(255, 255, 255, 0.6);
    --bg-glass-border: rgba(0, 0, 0, 0.06);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --accent-start: #d63851;
    --accent-mid: #7a2e3e;
    --accent-end: #4a2d75;
    --accent-glow: rgba(214, 56, 81, 0.2);
    --gradient-hero: linear-gradient(135deg, #e8e8f0 0%, #dce4f0 35%, #c8b8e0 70%, #e8a0b0 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(245, 245, 250, 0.7));
    --gradient-nav: linear-gradient(180deg, rgba(245, 245, 250, 0.95), rgba(245, 245, 250, 0.78));
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px rgba(214, 56, 81, 0.1);
  }
}

*, *::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-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(233, 69, 96, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(83, 52, 131, 0.08), transparent);
  pointer-events: none;
  z-index: 0;
}

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--accent-mid);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-start);
}

header {
  position: relative;
  background: var(--gradient-hero);
  padding: 100px 24px 80px;
  text-align: center;
  overflow: hidden;
  z-index: 1;
}

header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(233, 69, 96, 0.15), transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(83, 52, 131, 0.15), transparent 50%);
  animation: headerGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes headerGlow {
  0% { transform: translate(0, 0) scale(1); opacity: 0.6; }
  50% { transform: translate(2%, -2%) scale(1.05); opacity: 1; }
  100% { transform: translate(-2%, 2%) scale(1); opacity: 0.6; }
}

header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 120px;
  background: linear-gradient(to top, var(--bg-primary), transparent);
  pointer-events: none;
  z-index: 1;
}

header h1 {
  position: relative;
  z-index: 2;
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  max-width: 900px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, #fff 0%, #e0c8ff 50%, #ffb8c8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
  animation: fadeInUp 0.8s var(--transition-slow) both;
}

@media (prefers-color-scheme: light) {
  header h1 {
    background: linear-gradient(135deg, #1a1a2e 0%, #533483 50%, #d63851 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

header p {
  position: relative;
  z-index: 2;
  font-size: clamp(0.9rem, 1.8vw, 1.05rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto;
  line-height: 1.9;
  animation: fadeInUp 0.8s var(--transition-slow) 0.15s both;
}

@media (prefers-color-scheme: light) {
  header p {
    color: #4a4a6a;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--gradient-nav);
  backdrop-filter: blur(var(--blur-md)) saturate(1.8);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(1.8);
  border-bottom: 1px solid var(--bg-glass-border);
  padding: 0 16px;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 4px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

nav ul li {
  flex-shrink: 0;
}

nav ul li a {
  display: block;
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

nav ul li a:hover {
  color: #fff;
  background: var(--gradient-accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 15px var(--accent-glow);
}

@media (prefers-color-scheme: light) {
  nav ul li a:hover {
    color: #fff;
  }
}

main {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 80px;
}

section {
  margin-top: 56px;
  padding: 40px 32px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--bg-glass-border);
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  animation: sectionReveal 0.7s ease-out both;
  animation-timeline: view();
  animation-range: entry 0% entry 30%;
}

@keyframes sectionReveal {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

section h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 14px;
  position: relative;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

section p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.85;
}

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

section a {
  color: var(--accent-start);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast), text-decoration var(--transition-fast);
}

section a:hover {
  color: var(--accent-end);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

section ol li,
section ul li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.8;
}

section ol li::marker {
  color: var(--accent-start);
  font-weight: 700;
}

section ul li::marker {
  color: var(--accent-start);
}

blockquote {
  position: relative;
  padding: 20px 24px 20px 32px;
  margin: 16px 0;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-glass-border);
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

blockquote::before {
  content: '"';
  position: absolute;
  top: 4px;
  left: 12px;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent-start);
  opacity: 0.4;
  font-family: Georgia, serif;
}

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

blockquote p {
  font-style: italic;
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.95rem;
}

article {
  padding: 24px;
  margin-bottom: 16px;
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-glass-border);
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  animation: cardReveal 0.6s ease-out both;
  animation-timeline: view();
  animation-range: entry 0% entry 25%;
}

@keyframes cardReveal {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: rgba(233, 69, 96, 0.25);
  background: var(--bg-card-hover);
}

article h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

article time {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding: 2px 10px;
  background: var(--bg-glass);
  border-radius: 20px;
  border: 1px solid var(--bg-glass-border);
}

article p {
  font-size: 0.92rem;
  margin-bottom: 10px;
}

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

article a {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-start);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid var(--accent-start);
  transition: all var(--transition-fast);
  text-decoration: none;
}

article a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: translateY(-1px);
  text-decoration: none;
}

#faq h3 {
  padding: 14px 18px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-start);
  margin-top: 20px;
  margin-bottom: 8px;
  font-size: 1rem;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  cursor: default;
}

#faq h3:hover {
  background: var(--bg-card-hover);
  border-left-color: var(--accent-end);
}

#faq h3 + p {
  padding: 0 18px 8px;
  margin-bottom: 4px;
}

#howto ol {
  counter-reset: howto-counter;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  counter-increment: howto-counter;
  position: relative;
  padding: 14px 16px 14px 52px;
  margin-bottom: 10px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-glass-border);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

#howto ol li::before {
  content: counter(howto-counter);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
  box-shadow: 0 2px 8px var(--accent-glow);
}

#howto ol li:hover {
  transform: translateX(6px);
  background: var(--bg-card-hover);
}

#contact p {
  padding: 8px 0;
  border-bottom: 1px solid var(--bg-glass-border);
  font-size: 0.92rem;
}

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

#contact p:first-of-type {
  font-weight: 600;
  color: var(--text-primary);
}

#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  list-style: none;
  padding-left: 0;
}

#sitemap ul li,
#links ul li {
  margin-bottom: 0;
}

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-glass-border);
  text-decoration: none;
  transition: all var(--transition-fast);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  color: #fff;
  background: var(--gradient-accent);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-glow);
  text-decoration: none;
}

@media (prefers-color-scheme: light) {
  #sitemap ul li a:hover,
  #links ul li a:hover {
    color: #fff;
  }
}

footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--bg-glass-border);
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
}

footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1.7;
}

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

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  header {
    padding: 72px 18px 56px;
  }

  header h1 {
    font-size: clamp(1.3rem, 5.5vw, 1.8rem);
    margin-bottom: 16px;
  }

  header p {
    font-size: 0.88rem;
    line-height: 1.8;
  }

  nav {
    padding: 0 8px;
  }

  nav ul {
    padding: 6px 0;
    gap: 2px;
  }

  nav ul li a {
    padding: 8px 12px;
    font-size: 0.78rem;
  }

  main {
    padding: 0 12px 56px;
  }

  section {
    margin-top: 36px;
    padding: 28px 18px;
    border-radius: var(--radius-md);
  }

  section h2 {
    font-size: 1.2rem;
    margin-bottom: 18px;
    padding-bottom: 10px;
  }

  section h3 {
    font-size: 1rem;
    margin-top: 22px;
  }

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

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

  article h3 {
    font-size: 0.98rem;
  }

  article p {
    font-size: 0.88rem;
  }

  blockquote {
    padding: 16px 18px 16px 28px;
  }

  blockquote p {
    font-size: 0.88rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 6px;
  }

  #sitemap ul li a,
  #links ul li a {
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  #faq h3 {
    padding: 12px 14px;
    font-size: 0.92rem;
  }

  #faq h3 + p {
    padding: 0 14px 6px;
    font-size: 0.88rem;
  }

  #howto ol li {
    padding: 12px 12px 12px 46px;
    font-size: 0.88rem;
  }

  #howto ol li::before {
    left: 10px;
    width: 24px;
    height: 24px;
    font-size: 0.72rem;
  }

  footer {
    padding: 32px 18px;
  }

  footer p {
    font-size: 0.8rem;
  }
}

@media (max-width: 380px) {
  html {
    font-size: 14px;
  }

  header {
    padding: 60px 14px 48px;
  }

  section {
    padding: 22px 14px;
  }

  nav ul li a {
    padding: 7px 10px;
    font-size: 0.74rem;
  }
}

@media (min-width: 1200px) {
  section {
    padding: 48px 44px;
  }

  header {
    padding: 120px 40px 96px;
  }
}

@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,
  article {
    opacity: 1;
    transform: none;
  }
}

@media print {
  nav,
  footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

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