:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-card: rgba(30, 30, 55, 0.65);
  --bg-card-hover: rgba(40, 40, 70, 0.8);
  --bg-glass: rgba(26, 26, 46, 0.55);
  --bg-glass-border: rgba(233, 69, 96, 0.18);
  --text-primary: #f0f0f5;
  --text-secondary: #b8b8cc;
  --text-muted: #7a7a95;
  --accent-primary: #e94560;
  --accent-secondary: #ff6b81;
  --accent-tertiary: #c62a47;
  --accent-glow: rgba(233, 69, 96, 0.35);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e94560 100%);
  --gradient-card: linear-gradient(145deg, rgba(233, 69, 96, 0.08), rgba(15, 52, 96, 0.12));
  --gradient-btn: linear-gradient(135deg, #e94560, #c62a47);
  --gradient-btn-hover: linear-gradient(135deg, #ff6b81, #e94560);
  --gradient-text: linear-gradient(135deg, #e94560, #ff6b81, #ffa07a);
  --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 30px rgba(233, 69, 96, 0.2);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;
  --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(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --max-width: 1200px;
  --header-height: 68px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef0f6;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-card-hover: rgba(255, 255, 255, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.6);
    --bg-glass-border: rgba(233, 69, 96, 0.15);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.08);
    --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.1);
    --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.12);
    --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.12);
    --gradient-hero: linear-gradient(135deg, #eef0f6 0%, #e0e4f0 40%, #d0d8ee 70%, #f0d0d8 100%);
    --gradient-card: linear-gradient(145deg, rgba(233, 69, 96, 0.04), rgba(15, 52, 96, 0.06));
  }
}

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

html {
  scroll-behavior: smooth;
  -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-primary);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(233, 69, 96, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(15, 52, 96, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(233, 69, 96, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.4rem); }

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

strong {
  color: var(--text-primary);
  font-weight: 600;
}

blockquote {
  border-left: 3px solid var(--accent-primary);
  padding: 1rem 1.5rem;
  margin: 1.25rem 0;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-secondary);
}

blockquote p {
  margin-bottom: 0;
}

time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  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);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-height);
  flex-wrap: wrap;
}

header nav > div:first-child {
  flex-shrink: 0;
}

header nav > div:first-child a {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}

header nav > div:first-child a:hover {
  opacity: 0.85;
  -webkit-text-fill-color: transparent;
}

header nav > ul {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  flex-wrap: wrap;
}

header nav > ul li a {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

header nav > ul li a:hover {
  color: var(--text-primary);
  background: rgba(233, 69, 96, 0.12);
  transform: translateY(-1px);
}

header nav form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

header nav form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

header nav form[role="search"] input[type="search"] {
  width: 200px;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), width var(--transition-base);
}

header nav form[role="search"] input[type="search"]::placeholder {
  color: var(--text-muted);
}

header nav form[role="search"] input[type="search"]:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
  width: 260px;
}

header nav form[role="search"] button[type="submit"] {
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-btn);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}

header nav form[role="search"] button[type="submit"]:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

header nav form[role="search"] button[type="submit"]:active {
  transform: translateY(0);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

section {
  margin-bottom: 4rem;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
  opacity: 0;
  transform: translateY(24px);
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

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; }

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

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

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(233, 69, 96, 0.15); }
  50% { box-shadow: 0 0 40px rgba(233, 69, 96, 0.3); }
}

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

#hero {
  position: relative;
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2.5rem;
  margin-bottom: 3rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border: 1px solid var(--bg-glass-border);
}

#hero::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) 0%, transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(15, 52, 96, 0.2) 0%, transparent 40%);
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(15, 15, 26, 0.4) 100%);
  pointer-events: none;
  border-radius: var(--radius-xl);
}

#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;
  text-shadow: 0 2px 20px rgba(233, 69, 96, 0.2);
}

#hero p {
  position: relative;
  z-index: 1;
  max-width: 780px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.85;
}

#hero p strong {
  color: var(--accent-secondary);
  font-weight: 700;
}

#hero figure {
  position: relative;
  z-index: 1;
  margin-top: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

#hero figure:hover {
  transform: scale(1.015) translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(233, 69, 96, 0.15);
}

#hero figure img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

#hero figure:hover img {
  transform: scale(1.03);
}

#hero figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem 1.5rem 1rem;
  background: linear-gradient(transparent, rgba(15, 15, 26, 0.85));
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

nav[aria-label="面包屑导航"] {
  margin-bottom: 2rem;
}

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

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

nav[aria-label="面包屑导航"] ol li:not(:last-child)::after {
  content: "/";
  color: var(--text-muted);
  opacity: 0.5;
}

nav[aria-label="面包屑导航"] ol li a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

nav[aria-label="面包屑导航"] ol li a:hover {
  color: var(--accent-primary);
}

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

nav[aria-label="页面锚点导航"] {
  margin-bottom: 3rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

nav[aria-label="页面锚点导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

nav[aria-label="页面锚点导航"] ul li a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(233, 69, 96, 0.06);
  border: 1px solid rgba(233, 69, 96, 0.12);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

nav[aria-label="页面锚点导航"] ul li a:hover {
  color: #fff;
  background: var(--gradient-btn);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px var(--accent-glow);
}

section > h2 {
  position: relative;
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
}

section > h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--gradient-btn);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

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

section > h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  padding-left: 0.85rem;
  border-left: 3px solid var(--accent-primary);
}

section > ul,
section > ol {
  margin: 1rem 0 1.5rem;
  padding-left: 0;
}

section > ul li {
  position: relative;
  padding: 0.55rem 0 0.55rem 1.6rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

section > ul li::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 1rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient-btn);
  box-shadow: 0 0 8px var(--accent-glow);
  transition: transform var(--transition-fast);
}

section > ul li:hover {
  color: var(--text-primary);
  transform: translateX(4px);
}

section > ul li:hover::before {
  transform: scale(1.4);
}

section > ol {
  counter-reset: step-counter;
}

section > ol li {
  position: relative;
  padding: 0.65rem 0 0.65rem 2.6rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  counter-increment: step-counter;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

section > ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 1.7rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-btn);
  border-radius: 50%;
  box-shadow: 0 2px 10px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

section > ol li:hover {
  color: var(--text-primary);
  transform: translateX(4px);
}

section > ol li:hover::before {
  transform: scale(1.15);
  box-shadow: 0 4px 18px var(--accent-glow);
}

section > ol li strong {
  color: var(--accent-secondary);
}

article {
  position: relative;
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.25rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

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

article:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: rgba(233, 69, 96, 0.3);
  box-shadow: var(--shadow-md), 0 0 30px rgba(233, 69, 96, 0.1);
}

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

article h3 {
  margin-bottom: 0.5rem;
  padding-left: 0;
  border-left: none;
}

article h3 a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
  background-image: linear-gradient(var(--accent-primary), var(--accent-primary));
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: left bottom;
  transition: color var(--transition-fast), background-size var(--transition-base);
}

article h3 a:hover {
  color: var(--accent-secondary);
  background-size: 100% 2px;
}

article time {
  margin-bottom: 0.75rem;
  display: block;
}

article p {
  font-size: 0.92rem;
  line-height: 1.8;
  margin-bottom: 0.75rem;
}

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

article p a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--accent-primary);
  transition: color var(--transition-fast), gap var(--transition-fast);
}

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

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

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

#faq h3 {
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  font-size: 1.05rem;
  padding: 0.75rem 1rem 0.75rem 1.1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  cursor: default;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

#faq h3:hover {
  background: var(--bg-card-hover);
  border-left-color: var(--accent-secondary);
  transform: translateX(4px);
}

#faq p {
  padding-left: 1.1rem;
  font-size: 0.93rem;
  line-height: 1.85;
}

#cases blockquote {
  position: relative;
  padding-left: 2.5rem;
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 0.75rem;
  top: 0.25rem;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent-primary);
  opacity: 0.4;
  font-family: Georgia, serif;
}

#contact ul li {
  padding: 0.55rem 0 0.55rem 1.6rem;
}

#contact ul li strong {
  color: var(--text-primary);
}

#contact ul li a {
  color: var(--accent-primary);
  border-bottom: 1px dashed rgba(233, 69, 96, 0.4);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

#contact ul li a:hover {
  color: var(--accent-secondary);
  border-bottom-color: var(--accent-secondary);
}

#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
}

#sitemap ul li {
  padding: 0.5rem 0;
}

#sitemap ul li a {
  display: block;
  padding: 0.45rem 0.75rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

#sitemap ul li a:hover {
  color: var(--accent-primary);
  background: var(--bg-card-hover);
  border-color: var(--bg-glass-border);
  transform: translateX(4px);
}

#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

#links ul li {
  padding: 0;
}

#links ul li::before {
  display: none;
}

#links ul li a {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

#links ul li a:hover {
  color: #fff;
  background: var(--gradient-btn);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

#privacy p,
#disclaimer p,
#copyright p,
#security p,
#author p {
  font-size: 0.93rem;
  line-height: 1.85;
  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);
  margin-bottom: 1rem;
}

#author p {
  border-left: 3px solid var(--accent-primary);
}

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

footer {
  position: relative;
  background: var(--bg-secondary);
  border-top: 1px solid var(--bg-glass-border);
  padding: 3rem 1.25rem 2rem;
  margin-top: 2rem;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  opacity: 0.5;
}

footer nav {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
}

footer nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
}

footer nav ul li a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

footer nav ul li a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-primary);
  transition: width var(--transition-base);
}

footer nav ul li a:hover {
  color: var(--accent-primary);
}

footer nav ul li a:hover::after {
  width: 100%;
}

footer > p {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

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

@media (max-width: 900px) {
  header nav {
    height: auto;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  header nav > ul {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 0.15rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--bg-glass-border);
  }

  header nav > ul li a {
    font-size: 0.82rem;
    padding: 0.35rem 0.6rem;
  }

  header nav form[role="search"] {
    margin-left: auto;
  }

  header nav form[role="search"] input[type="search"] {
    width: 160px;
  }

  header nav form[role="search"] input[type="search"]:focus {
    width: 200px;
  }

  #hero {
    padding: 2.5rem 1.75rem;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  header nav {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  header nav > div:first-child a {
    font-size: 1.15rem;
  }

  header nav form[role="search"] {
    order: 2;
    width: 100%;
    margin-left: 0;
  }

  header nav form[role="search"] input[type="search"] {
    flex: 1;
    width: auto;
    min-width: 0;
  }

  header nav form[role="search"] input[type="search"]:focus {
    width: auto;
  }

  header nav form[role="search"] button[type="submit"] {
    padding: 0.5rem 0.9rem;
    font-size: 0.8rem;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  section {
    margin-bottom: 3rem;
  }

  #hero {
    padding: 2rem 1.25rem;
    border-radius: var(--radius-lg);
  }

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

  #hero figure {
    margin-top: 1.5rem;
    border-radius: var(--radius-md);
  }

  #hero figcaption {
    font-size: 0.78rem;
    padding: 1rem 1rem 0.75rem;
  }

  nav[aria-label="页面锚点导航"] {
    padding: 1rem;
  }

  nav[aria-label="页面锚点导航"] ul li a {
    font-size: 0.78rem;
    padding: 0.3rem 0.7rem;
  }

  article {
    padding: 1.25rem 1.25rem;
    border-radius: var(--radius-md);
  }

  article h3 {
    font-size: 1.05rem;
  }

  #faq h3 {
    font-size: 0.98rem;
    padding: 0.65rem 0.85rem 0.65rem 0.95rem;
  }

  #faq p {
    padding-left: 0.95rem;
    font-size: 0.88rem;
  }

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

  #sitemap ul li a {
    font-size: 0.82rem;
    padding: 0.4rem 0.6rem;
  }

  #links ul {
    gap: 0.5rem;
  }

  #links ul li a {
    font-size: 0.8rem;
    padding: 0.4rem 0.9rem;
  }

  blockquote {
    padding: 0.85rem 1.1rem;
  }

  #cases blockquote {
    padding-left: 2rem;
  }

  #cases blockquote::before {
    font-size: 2rem;
    left: 0.5rem;
  }

  footer {
    padding: 2rem 1rem 1.5rem;
  }

  footer nav ul {
    gap: 0.4rem 1rem;
  }

  footer nav ul li a {
    font-size: 0.82rem;
  }

  footer > p {
    font-size: 0.78rem;
  }
}

@media (max-width: 380px) {
  header nav > ul li a {
    font-size: 0.75rem;
    padding: 0.3rem 0.5rem;
  }

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

  #hero {
    padding: 1.5rem 1rem;
  }
}

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

@media print {
  header,
  footer,
  nav[aria-label="页面锚点导航"],
  nav[aria-label="面包屑导航"],
  #links,
  #sitemap {
    display: none;
  }

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

  section {
    opacity: 1;
    transform: none;
    page-break-inside: avoid;
  }

  article {
    border: 1px solid #ccc;
    box-shadow: none;
    background: #fff;
  }

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

::selection {
  background: rgba(233, 69, 96, 0.35);
  color: var(--text-primary);
}

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

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

::-webkit-scrollbar-thumb {
  background: rgba(233, 69, 96, 0.35);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(233, 69, 96, 0.55);
}

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