:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(30, 30, 52, 0.65);
  --bg-card-hover: rgba(40, 40, 68, 0.85);
  --bg-glass: rgba(26, 26, 46, 0.55);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text-primary: #eaeaf2;
  --text-secondary: #a8a8c0;
  --text-muted: #6e6e8a;
  --accent: #e94560;
  --accent-light: #ff6b81;
  --accent-dark: #c23152;
  --accent-glow: rgba(233, 69, 96, 0.35);
  --gradient-1: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e94560 130%);
  --gradient-2: linear-gradient(135deg, #e94560 0%, #533483 100%);
  --gradient-3: linear-gradient(120deg, #0f3460 0%, #1a1a2e 50%, #533483 100%);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 30%, #0f3460 60%, #2d1b69 100%);
  --gradient-text: linear-gradient(135deg, #ff6b81 0%, #e94560 40%, #a855f7 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 32px var(--accent-glow);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --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);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1200px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eeeef6;
    --bg-card: rgba(255, 255, 255, 0.72);
    --bg-card-hover: rgba(255, 255, 255, 0.92);
    --bg-glass: rgba(255, 255, 255, 0.55);
    --bg-glass-border: rgba(0, 0, 0, 0.06);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #8a8aa8;
    --accent: #d6335a;
    --accent-light: #e94560;
    --accent-dark: #b02445;
    --accent-glow: rgba(214, 51, 90, 0.25);
    --gradient-hero: linear-gradient(135deg, #e8e8f5 0%, #dde4f5 30%, #d0daf0 60%, #e8d5f5 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 32px var(--accent-glow);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-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;
  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%;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 10% 0%, rgba(233, 69, 96, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 90% 20%, rgba(83, 52, 131, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 50% 100%, rgba(15, 52, 96, 0.12) 0%, transparent 60%);
}

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

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

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

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

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);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  margin-bottom: 1.25rem;
  position: relative;
  padding-left: 1rem;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 4px;
  border-radius: 4px;
  background: var(--gradient-2);
}

h3 {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: clamp(0.925rem, 1.5vw, 1rem);
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.75rem clamp(1rem, 4vw, 3rem);
  background: var(--bg-glass);
  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-base), box-shadow var(--transition-base);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  font-weight: 700;
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.brand svg {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--accent-glow), var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.brand:hover svg {
  transform: rotate(-8deg) scale(1.08);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-glow);
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

header nav a {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

header nav a::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.25rem;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

header nav a:hover {
  color: var(--text-primary);
  background: rgba(233, 69, 96, 0.1);
  transform: translateY(-1px);
}

header nav a:hover::after {
  transform: scaleX(1);
}

nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 3rem) 0;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

nav[aria-label="面包屑导航"] li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

nav[aria-label="面包屑导航"] a {
  color: var(--text-secondary);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

nav[aria-label="面包屑导航"] a:hover {
  color: var(--accent-light);
  background: rgba(233, 69, 96, 0.08);
}

nav[aria-label="面包屑导航"] [aria-current="page"] {
  color: var(--accent-light);
  font-weight: 600;
}

main {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 3rem) 4rem;
}

main > section {
  margin-top: 2.5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.15);
}

main > section:nth-child(2) { animation-delay: 0.05s; }
main > section:nth-child(3) { animation-delay: 0.1s; }
main > section:nth-child(4) { animation-delay: 0.15s; }
main > section:nth-child(5) { animation-delay: 0.2s; }
main > section:nth-child(6) { animation-delay: 0.25s; }

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

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

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

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

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 24px 4px var(--accent-glow); }
}

#hero {
  position: relative;
  margin-top: 1.5rem;
  padding: clamp(2rem, 6vw, 4rem) clamp(1.5rem, 5vw, 3.5rem);
  background: var(--gradient-hero);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.18) 0%, transparent 65%);
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 50%;
  height: 150%;
  background: radial-gradient(circle, rgba(83, 52, 131, 0.22) 0%, transparent 65%);
  pointer-events: none;
  animation: float 10s ease-in-out infinite reverse;
}

#hero h1 {
  position: relative;
  z-index: 1;
  margin-bottom: 1.25rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  background-size: 200% auto;
  animation: shimmer 6s linear infinite;
}

#hero p {
  position: relative;
  z-index: 1;
  max-width: 780px;
  color: var(--text-secondary);
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.85;
}

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

#articles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

#articles h2 {
  grid-column: 1 / -1;
}

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

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(233, 69, 96, 0.25);
  background: var(--bg-card-hover);
}

#articles article:hover::before {
  transform: scaleX(1);
}

#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  transition: color var(--transition-fast);
}

#articles article:hover h3 {
  color: var(--accent-light);
}

#articles article p:nth-of-type(1) {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

#articles article p:nth-of-type(1)::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

#articles article p:nth-of-type(2) {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
  line-height: 1.7;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-light);
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  background: rgba(233, 69, 96, 0.1);
  border: 1px solid rgba(233, 69, 96, 0.2);
  transition: all var(--transition-fast);
}

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

#articles article a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 4px 16px var(--accent-glow);
}

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

#faq h3 {
  position: relative;
  padding: 1rem 1.25rem;
  margin-top: 0.75rem;
  margin-bottom: 0;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  font-size: clamp(0.95rem, 1.7vw, 1.05rem);
  cursor: default;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

#faq h3::before {
  content: "Q";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-right: 0.6rem;
  font-size: 0.7rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-2);
  border-radius: 50%;
  vertical-align: middle;
  flex-shrink: 0;
}

#faq h3:hover {
  background: var(--bg-card-hover);
  border-color: rgba(233, 69, 96, 0.2);
}

#faq h3 + p {
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--bg-glass-border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 0.925rem;
  line-height: 1.75;
  color: var(--text-secondary);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

#faq h3 + p:hover {
  background: var(--bg-card-hover);
  border-color: rgba(233, 69, 96, 0.15);
}

#howto {
  counter-reset: howto-step;
}

#howto h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

#howto h3::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-2);
  flex-shrink: 0;
}

#cases p,
#contact p {
  font-size: 0.95rem;
}

#cases p:nth-of-type(odd) {
  color: var(--text-secondary);
}

#cases p:nth-of-type(even) {
  padding: 0.75rem 1rem;
  background: var(--bg-glass);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

#contact h3 {
  color: var(--accent-light);
}

#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

#sitemap li a,
#links li a {
  display: inline-block;
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--bg-glass-border);
  border-radius: 50px;
  transition: all var(--transition-fast);
}

#sitemap li a:hover,
#links li a:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

footer {
  position: relative;
  z-index: 1;
  margin-top: 3rem;
  padding: clamp(2rem, 5vw, 3rem) clamp(1rem, 4vw, 3rem) 1.5rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--bg-glass-border);
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-2);
  opacity: 0.6;
}

footer section {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

footer section:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.15);
}

footer h2 {
  font-size: clamp(1rem, 2vw, 1.15rem);
  margin-bottom: 0.75rem;
  padding-left: 0.75rem;
}

footer h2::before {
  width: 3px;
}

footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

footer > p:last-child {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--bg-glass-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

#author-info p:nth-of-type(1),
#author-info p:nth-of-type(2) {
  color: var(--text-secondary);
}

#author-info p:nth-of-type(3),
#author-info p:nth-of-type(4) {
  display: inline-block;
  margin-right: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

#legal h2 {
  margin-top: 1rem;
}

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

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

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

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

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-dark), var(--accent));
  border-radius: 10px;
  border: 2px solid var(--bg-primary);
}

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

@media (min-width: 640px) {
  #articles {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  #articles {
    grid-template-columns: repeat(3, 1fr);
  }

  #articles article:first-of-type {
    grid-column: span 2;
  }

  #articles article:first-of-type h3 {
    font-size: 1.3rem;
  }
}

@media (max-width: 900px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }

  header nav {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

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

  header nav ul {
    flex-wrap: nowrap;
    gap: 0.15rem;
    padding-bottom: 0.25rem;
  }

  header nav a {
    white-space: nowrap;
    font-size: 0.82rem;
    padding: 0.35rem 0.6rem;
  }
}

@media (max-width: 600px) {
  html {
    scroll-padding-top: 120px;
  }

  body {
    font-size: 15px;
    line-height: 1.7;
  }

  main {
    padding: 0 0.85rem 2.5rem;
  }

  main > section {
    margin-top: 1.5rem;
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }

  #hero {
    margin-top: 1rem;
    padding: 1.75rem 1.25rem;
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
    padding-left: 0.85rem;
  }

  h3 {
    font-size: 1.02rem;
  }

  #articles {
    gap: 1rem;
  }

  #articles article {
    padding: 1.15rem;
  }

  #faq h3 {
    padding: 0.85rem 1rem;
    font-size: 0.9rem;
  }

  #faq h3 + p {
    padding: 0.85rem 1rem;
    font-size: 0.875rem;
  }

  #sitemap li a,
  #links li a {
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
  }

  footer {
    padding: 1.5rem 0.85rem 1rem;
  }

  footer section {
    padding: 1rem;
  }

  nav[aria-label="面包屑导航"] {
    padding: 0.75rem 0.85rem 0;
  }
}

@media (max-width: 380px) {
  header nav a {
    font-size: 0.78rem;
    padding: 0.3rem 0.5rem;
  }

  #hero h1 {
    font-size: 1.3rem;
  }
}

@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 print {
  body::before,
  header,
  footer::before {
    display: none;
  }

  main > section,
  #hero,
  footer section {
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
    animation: none;
  }

  a {
    color: #000;
  }
}