:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(26, 26, 46, 0.72);
  --bg-card-hover: rgba(34, 34, 58, 0.86);
  --bg-glass: rgba(255, 255, 255, 0.06);
  --bg-glass-strong: rgba(255, 255, 255, 0.1);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-glass-hover: rgba(255, 255, 255, 0.22);
  --text-primary: #f0f0f5;
  --text-secondary: #b8b8cc;
  --text-muted: #8888a0;
  --accent-start: #6c5ce7;
  --accent-end: #00cec9;
  --accent-glow: rgba(108, 92, 231, 0.35);
  --accent-secondary: #fd79a8;
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #16213e 30%, #0f3460 60%, #1a1a2e 100%);
  --gradient-accent: linear-gradient(135deg, #6c5ce7, #00cec9);
  --gradient-accent-hover: linear-gradient(135deg, #7d6ef0, #1ee0db);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 24px rgba(108, 92, 231, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;
  --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", "Fira Mono", "Roboto Mono", monospace;
  --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);
  --max-width: 1200px;
  --header-height: 64px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f6fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.78);
    --bg-card-hover: rgba(255, 255, 255, 0.92);
    --bg-glass: rgba(255, 255, 255, 0.55);
    --bg-glass-strong: rgba(255, 255, 255, 0.72);
    --border-glass: rgba(0, 0, 0, 0.08);
    --border-glass-hover: rgba(0, 0, 0, 0.16);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --accent-start: #5b4cdb;
    --accent-end: #00b4b0;
    --accent-glow: rgba(91, 76, 219, 0.2);
    --gradient-banner: linear-gradient(135deg, #e8eaf6 0%, #e0f7fa 30%, #e8eaf6 60%, #f3e5f5 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.14);
    --shadow-glow: 0 0 24px rgba(91, 76, 219, 0.12);
  }
}

*,
*::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);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(108, 92, 231, 0.12), transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 90%, rgba(0, 206, 201, 0.08), transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(253, 121, 168, 0.05), transparent 60%);
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

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

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-glass);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-glass-hover);
}

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

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.25rem;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1.25rem;
  position: relative;
  padding-bottom: 0.75rem;
}

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

section:hover > h2::after {
  width: 88px;
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

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

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

header:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

header nav a {
  flex-shrink: 0;
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

header nav a::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: -1;
}

header nav a:hover {
  color: #fff;
  transform: translateY(-1px);
}

header nav a:hover::before {
  opacity: 1;
  transform: scale(1);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 80px;
}

section {
  margin-bottom: 48px;
  padding: 36px 28px;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: background var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth), transform var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  pointer-events: none;
}

section:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

section#home {
  background: var(--gradient-banner);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 64px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-top: 24px;
}

section#home::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 400px at 20% 30%, rgba(108, 92, 231, 0.2), transparent),
    radial-gradient(circle 300px at 80% 70%, rgba(0, 206, 201, 0.15), transparent);
  pointer-events: none;
  animation: bannerGlow 8s ease-in-out infinite alternate;
}

@keyframes bannerGlow {
  0% { opacity: 0.6; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}

section#home h1 {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

section#home p {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.05rem;
  color: var(--text-secondary);
}

section#home p:last-of-type {
  margin-bottom: 0;
}

article {
  padding: 24px;
  margin-bottom: 20px;
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: background var(--transition-smooth), border-color var(--transition-smooth), transform var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--gradient-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: height var(--transition-smooth);
}

article:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glass-hover);
  transform: translateX(6px);
  box-shadow: var(--shadow-card);
}

article:hover::before {
  height: 100%;
}

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

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

article p {
  font-size: 0.925rem;
  margin-bottom: 0.75rem;
}

article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-end);
  padding: 6px 14px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}

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

article a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

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

section#faq h3 {
  padding: 20px 24px 8px;
  margin-bottom: 0;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  cursor: default;
  transition: background var(--transition-fast);
  font-size: 1rem;
}

section#faq h3:hover {
  background: var(--bg-glass-strong);
}

section#faq h3 + p {
  padding: 0 24px 20px;
  margin-bottom: 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-size: 0.925rem;
  transition: background var(--transition-fast);
}

section#faq h3 + p:hover {
  background: var(--bg-glass-strong);
}

section#faq h3 + p:last-child {
  margin-bottom: 0;
}

section#howto h3 {
  color: var(--accent-end);
  font-size: 1.05rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

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

section#howto p {
  font-size: 0.95rem;
}

section#contact p {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-glass);
  transition: padding-left var(--transition-fast), border-color var(--transition-fast);
}

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

section#contact p:hover {
  padding-left: 8px;
  border-color: var(--accent-end);
}

section#sitemap ul,
section#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

section#sitemap ul li a,
section#links ul li a {
  display: block;
  padding: 12px 18px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  transition: all var(--transition-fast);
}

section#sitemap ul li a:hover,
section#links ul li a:hover {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

section#legal h2 {
  font-size: 1.15rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

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

section#legal h2::after {
  width: 32px;
  height: 2px;
}

section#legal p {
  font-size: 0.9rem;
}

section#legal p:last-child {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-glass);
  padding: 32px 20px;
  text-align: center;
  transition: background var(--transition-smooth);
}

footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

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

footer p:last-child {
  margin-bottom: 0;
  font-size: 0.8rem;
}

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

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

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; }

article {
  animation: fadeInLeft 0.5s ease-out both;
}

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

@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%;
  }

  main {
    padding: 0 16px 60px;
  }

  section {
    padding: 28px 22px;
    margin-bottom: 36px;
  }

  section#home {
    padding: 48px 28px;
  }
}

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

  body {
    font-size: 15px;
  }

  header nav {
    padding: 0 12px;
    gap: 2px;
  }

  header nav a {
    padding: 6px 10px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 12px 48px;
  }

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

  section#home {
    padding: 36px 20px;
    border-radius: var(--radius-lg);
    margin-top: 16px;
  }

  section#home p {
    font-size: 0.95rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.05rem;
  }

  article {
    padding: 18px;
    margin-bottom: 14px;
  }

  article:hover {
    transform: translateX(3px);
  }

  section#faq h3 {
    padding: 16px 18px 6px;
    font-size: 0.95rem;
  }

  section#faq h3 + p {
    padding: 0 18px 16px;
    font-size: 0.875rem;
  }

  section#sitemap ul,
  section#links ul {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
  }

  section#sitemap ul li a,
  section#links ul li a {
    padding: 10px 12px;
    font-size: 0.825rem;
  }

  section#contact p {
    font-size: 0.875rem;
    flex-wrap: wrap;
  }

  footer {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
    line-height: 1.7;
  }

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

  main {
    padding: 0 10px 40px;
  }

  section {
    padding: 20px 14px;
    margin-bottom: 22px;
    border-radius: var(--radius-sm);
  }

  section#home {
    padding: 28px 16px;
    border-radius: var(--radius-md);
  }

  h1 {
    font-size: 1.35rem;
  }

  h2 {
    font-size: 1.15rem;
    padding-bottom: 0.5rem;
  }

  h2::after {
    width: 40px;
    height: 2px;
  }

  h3 {
    font-size: 0.975rem;
  }

  article {
    padding: 14px;
    border-radius: var(--radius-sm);
  }

  article a {
    font-size: 0.8rem;
    padding: 5px 10px;
  }

  section#faq h3 {
    padding: 14px 14px 5px;
    font-size: 0.9rem;
  }

  section#faq h3 + p {
    padding: 0 14px 14px;
    font-size: 0.825rem;
  }

  section#sitemap ul,
  section#links ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
  }

  section#sitemap ul li a,
  section#links ul li a {
    padding: 8px 10px;
    font-size: 0.775rem;
  }

  footer p {
    font-size: 0.8rem;
  }

  footer p:last-child {
    font-size: 0.75rem;
  }
}

@media (min-width: 1400px) {
  :root {
    --max-width: 1320px;
  }

  section {
    padding: 44px 36px;
  }

  section#home {
    padding: 80px 48px;
  }
}

@media print {
  header,
  footer,
  section#sitemap,
  section#links {
    display: none;
  }

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

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

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