:root {
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --primary-lighter: #c4b5fd;
  --primary-lightest: #ddd6fe;
  --primary-dark: #5b21b6;
  --primary-darker: #4c1d95;
  --accent: #f472b6;
  --accent-soft: #fbcfe8;
  --bg: #f8f7fc;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.65);
  --bg-glass-strong: rgba(255, 255, 255, 0.82);
  --text: #1e1b2e;
  --text-secondary: #5b5670;
  --text-muted: #8a8499;
  --border: rgba(124, 58, 237, 0.14);
  --border-strong: rgba(124, 58, 237, 0.28);
  --shadow-sm: 0 2px 8px rgba(76, 29, 149, 0.06);
  --shadow-md: 0 8px 24px rgba(76, 29, 149, 0.1);
  --shadow-lg: 0 16px 48px rgba(76, 29, 149, 0.16);
  --shadow-glow: 0 0 0 3px rgba(124, 58, 237, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;
  --gradient-banner: linear-gradient(135deg, #7c3aed 0%, #a855f7 45%, #f472b6 100%);
  --gradient-banner-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(244, 114, 182, 0.08) 100%);
  --gradient-text: linear-gradient(120deg, #7c3aed 0%, #a855f7 50%, #f472b6 100%);
  --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 247, 252, 0.7) 100%);
  --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);
  --header-height: 68px;
  --content-max: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0b16;
    --bg-elevated: #16121f;
    --bg-glass: rgba(28, 23, 42, 0.6);
    --bg-glass-strong: rgba(28, 23, 42, 0.82);
    --text: #f2eefb;
    --text-secondary: #b8b0cc;
    --text-muted: #7d7590;
    --border: rgba(167, 139, 250, 0.16);
    --border-strong: rgba(167, 139, 250, 0.32);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 0 3px rgba(167, 139, 250, 0.25);
    --gradient-banner: linear-gradient(135deg, #4c1d95 0%, #7c3aed 45%, #db2777 100%);
    --gradient-banner-soft: linear-gradient(135deg, rgba(124, 58, 237, 0.16) 0%, rgba(244, 114, 182, 0.12) 100%);
    --gradient-card: linear-gradient(160deg, rgba(34, 28, 50, 0.9) 0%, rgba(22, 18, 31, 0.7) 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(124, 58, 237, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 95% 5%, rgba(244, 114, 182, 0.1), transparent);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

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

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin: 0 0 1rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: gradientShift 8s ease infinite;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin: 0 0 1.25rem;
  position: relative;
  padding-bottom: 0.75rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--gradient-banner);
  transition: width var(--transition-base);
}

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

h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  margin: 1.75rem 0 0.75rem;
}

h4 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--primary);
}

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

ul, ol {
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.4rem;
}

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

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

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.35); }
  50% { box-shadow: 0 0 0 12px rgba(124, 58, 237, 0); }
}

/* ============ Header / Navigation ============ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

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

header nav {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

header nav > a:first-child {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  transition: transform var(--transition-fast);
}

header nav > a:first-child:hover {
  transform: scale(1.04);
}

header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

header nav ul li a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  position: relative;
}

header nav ul li a::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  background: var(--gradient-banner-soft);
  opacity: 0;
  transform: scale(0.85);
  transition: all var(--transition-fast);
  z-index: -1;
}

header nav ul li a:hover {
  color: var(--primary);
  transform: translateY(-1px);
}

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

/* ============ Main Layout ============ */
main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px 64px;
}

section {
  margin: 0 0 32px;
  padding: 32px;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

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

section:nth-of-type(2) { animation-delay: 0.05s; }
section:nth-of-type(3) { animation-delay: 0.1s; }
section:nth-of-type(4) { animation-delay: 0.15s; }
section:nth-of-type(5) { animation-delay: 0.2s; }
section:nth-of-type(6) { animation-delay: 0.25s; }
section:nth-of-type(7) { animation-delay: 0.3s; }
section:nth-of-type(8) { animation-delay: 0.35s; }

/* ============ Hero / Banner ============ */
#hero {
  position: relative;
  margin-top: 24px;
  padding: 56px 40px;
  background: var(--gradient-banner);
  border: none;
  border-radius: var(--radius-xl);
  overflow: hidden;
  color: #ffffff;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.22), transparent 42%),
    radial-gradient(circle at 85% 80%, rgba(255, 255, 255, 0.16), transparent 45%),
    radial-gradient(circle at 60% 10%, rgba(255, 255, 255, 0.1), transparent 35%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -140px;
  top: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), transparent 70%);
  animation: floatY 9s ease-in-out infinite;
  pointer-events: none;
}

#hero h1 {
  position: relative;
  z-index: 1;
  color: #ffffff;
  -webkit-text-fill-color: #ffffff;
  background: none;
  text-shadow: 0 2px 18px rgba(76, 29, 149, 0.35);
}

#hero h1::after {
  display: none;
}

#hero p {
  position: relative;
  z-index: 1;
  max-width: 780px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.02rem;
  line-height: 1.85;
}

#hero figure {
  position: relative;
  z-index: 1;
  margin: 32px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(76, 29, 149, 0.35);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

#hero figure:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 28px 64px rgba(76, 29, 149, 0.45);
}

#hero figure svg {
  width: 100%;
  height: auto;
  display: block;
}

#hero figcaption {
  padding: 12px 16px;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(76, 29, 149, 0.35);
  text-align: center;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

/* ============ Breadcrumb ============ */
main > nav[aria-label="面包屑导航"] {
  margin: 0 0 24px;
  padding: 0 4px;
}

main > nav[aria-label="面包屑导航"] ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] ol li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

main > nav[aria-label="面包屑导航"] ol li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.6;
}

main > nav[aria-label="面包屑导航"] ol li[aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

/* ============ Cards for articles / news ============ */
article {
  position: relative;
  margin: 0 0 18px;
  padding: 24px 26px;
  background: var(--gradient-card);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base),
    border-color var(--transition-base);
  overflow: hidden;
}

article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-banner);
  opacity: 0;
  transition: opacity var(--transition-base);
}

article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

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

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

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

article p {
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

article p:first-of-type {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

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

article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--gradient-banner-soft);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
}

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

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

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

/* ============ FAQ Accordion-style blocks ============ */
#faq h3 {
  position: relative;
  padding: 16px 20px 16px 48px;
  margin: 0 0 8px;
  font-size: 1.02rem;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: default;
  transition: all var(--transition-base);
}

#faq h3::before {
  content: "?";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: #ffffff;
  background: var(--gradient-banner);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

#faq h3:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

#faq h3 + p {
  padding: 0 20px 16px 48px;
  margin: 0 0 12px;
  font-size: 0.95rem;
  border-bottom: 1px dashed var(--border);
}

/* ============ HowTo / Steps ============ */
#howto h4 {
  position: relative;
  padding: 12px 18px 12px 44px;
  background: var(--gradient-banner-soft);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--primary);
  font-size: 1rem;
}

#howto h4::before {
  content: "▸";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 1.1rem;
}

#howto h3 {
  display: inline-block;
  padding: 4px 14px;
  background: var(--gradient-banner);
  color: #ffffff;
  font-size: 0.92rem;
  border-radius: var(--radius-full);
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
}

/* ============ Contact & Lists ============ */
#contact ul,
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: grid;
  gap: 10px;
}

#contact ul {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

#contact ul li {
  padding: 14px 18px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#contact ul li:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--text);
}

#sitemap ul,
#links ul {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

#sitemap ul li a,
#links ul li a {
  display: block;
  padding: 10px 16px;
  background: var(--gradient-banner-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
  transition: all var(--transition-fast);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  background: var(--gradient-banner);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============ Legal ============ */
#legal h3 {
  color: var(--primary);
  font-size: 1.05rem;
}

#legal p {
  font-size: 0.94rem;
}

#legal p:last-child {
  padding: 14px 18px;
  background: var(--gradient-banner-soft);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent);
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ============ Footer ============ */
footer {
  position: relative;
  margin-top: 24px;
  padding: 40px 24px;
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-top: 1px solid var(--border);
  text-align: center;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-banner);
  background-size: 200% auto;
  animation: gradientShift 6s ease infinite;
}

footer p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

footer a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 8px 22px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--gradient-banner);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

footer a::before {
  content: "↑";
  font-weight: 800;
}

footer a:hover {
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  animation: pulseGlow 1.8s ease infinite;
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

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

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

::selection {
  background: rgba(124, 58, 237, 0.22);
  color: var(--text);
}

/* ============ Responsive: Tablet ============ */
@media (max-width: 900px) {
  main {
    padding: 0 18px 48px;
  }

  section {
    padding: 26px 22px;
    border-radius: var(--radius-md);
  }

  #hero {
    padding: 44px 26px;
    border-radius: var(--radius-lg);
  }

  header nav {
    padding: 0 18px;
    gap: 12px;
  }

  header nav ul li a {
    padding: 7px 11px;
    font-size: 0.85rem;
  }
}

/* ============ Responsive: Mobile ============ */
@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  :root {
    --header-height: 60px;
  }

  header nav {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 16px;
    gap: 10px;
  }

  header nav ul {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  header nav ul li {
    flex: 0 0 auto;
  }

  main {
    padding: 0 14px 40px;
  }

  section {
    padding: 22px 16px;
    margin-bottom: 20px;
    border-radius: var(--radius-md);
  }

  #hero {
    margin-top: 16px;
    padding: 32px 18px;
    border-radius: var(--radius-md);
  }

  #hero p {
    font-size: 0.94rem;
  }

  #hero figure {
    margin-top: 22px;
  }

  h2 {
    font-size: 1.3rem;
  }

  h2::after {
    width: 44px;
    height: 3px;
  }

  h3 {
    font-size: 1.05rem;
  }

  article {
    padding: 18px 16px;
  }

  #faq h3 {
    padding: 14px 14px 14px 42px;
    font-size: 0.96rem;
  }

  #faq h3 + p {
    padding: 0 14px 14px 42px;
    font-size: 0.9rem;
  }

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

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

  footer {
    padding: 30px 16px;
  }

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

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

/* ============ Print ============ */
@media print {
  header,
  footer,
  #hero::before,
  #hero::after {
    display: none;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

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