:root {
  --primary: #2E3192;
  --primary-light: #4A4EB8;
  --primary-dark: #1A1D5E;
  --accent: #FF6B9D;
  --accent-light: #FF9BBF;
  --accent-glow: rgba(255, 107, 157, 0.4);
  --secondary: #00C9DB;
  --secondary-light: #5EE7F0;
  --bg-body: #F5F6FA;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAFBFF;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-border: rgba(255, 255, 255, 0.5);
  --bg-elevated: #FFFFFF;
  --text-primary: #1A1D2E;
  --text-secondary: #4A4D6A;
  --text-muted: #8B8FA8;
  --text-inverse: #FFFFFF;
  --border-color: rgba(46, 49, 146, 0.1);
  --border-light: rgba(46, 49, 146, 0.06);
  --shadow-sm: 0 1px 3px rgba(46, 49, 146, 0.06), 0 1px 2px rgba(46, 49, 146, 0.04);
  --shadow-md: 0 4px 16px rgba(46, 49, 146, 0.1), 0 2px 6px rgba(46, 49, 146, 0.06);
  --shadow-lg: 0 12px 40px rgba(46, 49, 146, 0.14), 0 4px 12px rgba(46, 49, 146, 0.08);
  --shadow-glow: 0 0 30px rgba(255, 107, 157, 0.3);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
}

[data-theme="dark"] {
  --primary: #6B6FF0;
  --primary-light: #8B8FFF;
  --primary-dark: #4A4EB8;
  --accent: #FF6B9D;
  --accent-light: #FF9BBF;
  --accent-glow: rgba(255, 107, 157, 0.25);
  --secondary: #33D9E8;
  --secondary-light: #66E5F0;
  --bg-body: #0F1020;
  --bg-card: #1A1B35;
  --bg-card-hover: #22234A;
  --bg-glass: rgba(26, 27, 53, 0.78);
  --bg-glass-border: rgba(107, 111, 240, 0.15);
  --bg-elevated: #22234A;
  --text-primary: #EAEBF5;
  --text-secondary: #A8AAC8;
  --text-muted: #6B6E8A;
  --text-inverse: #0F1020;
  --border-color: rgba(107, 111, 240, 0.15);
  --border-light: rgba(107, 111, 240, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(107, 111, 240, 0.25);
}

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

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-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

#app::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 20%, rgba(46, 49, 146, 0.04) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 107, 157, 0.03) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(0, 201, 219, 0.02) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
  transition: opacity var(--transition-base);
}

[data-theme="dark"] #app::before {
  background: radial-gradient(circle at 20% 20%, rgba(107, 111, 240, 0.06) 0%, transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255, 107, 157, 0.04) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(0, 201, 219, 0.03) 0%, transparent 60%);
}

a {
  color: var(--primary);
  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: 2px;
  border-radius: 2px;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
  color: inherit;
  transition: all var(--transition-fast);
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.01em;
  position: relative;
  padding-bottom: 0.6rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width var(--transition-slow);
}

section:hover > h2::after {
  width: 80px;
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  margin-top: 1.5rem;
}

h4 {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  margin-top: 1.2rem;
  color: var(--text-secondary);
}

p {
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  transition: color var(--transition-base);
}

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

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);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

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

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header nav > div:first-child a {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast);
}

header nav > div:first-child a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

header nav > div:first-child a:hover::after {
  transform: scaleX(1);
}

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

header nav ul li a {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

header nav ul li a::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  background: var(--primary);
  opacity: 0;
  transform: scale(0.85);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

header nav ul li a:hover {
  color: var(--text-inverse);
}

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

header nav ul li a span {
  position: relative;
  z-index: 1;
}

header nav > button {
  padding: 0.45rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-color);
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

header nav > button:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(46, 49, 146, 0.06);
  transform: translateY(-1px);
}

header nav > button:last-of-type {
  display: none;
}

main {
  flex: 1;
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

section {
  padding: 3.5rem 0;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

section[aria-label="首屏介绍"] {
  position: relative;
  padding: 4rem 2.5rem;
  margin-top: 1.5rem;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #2E3192 0%, #4A4EB8 30%, #6B3FA0 60%, #FF6B9D 100%);
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
  overflow: hidden;
  color: #fff;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

section[aria-label="首屏介绍"]::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: float 6s ease-in-out infinite;
}

section[aria-label="首屏介绍"]::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 201, 219, 0.2) 0%, transparent 70%);
  pointer-events: none;
  animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(20px, -20px) scale(1.05); }
}

section[aria-label="首屏介绍"] h1 {
  color: #fff;
  margin-bottom: 1.25rem;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

section[aria-label="首屏介绍"] p {
  color: rgba(255, 255, 255, 0.88);
  max-width: 720px;
  position: relative;
  z-index: 1;
  font-size: 1.05rem;
}

section[aria-label="首屏介绍"] nav {
  position: relative;
  z-index: 1;
  margin-top: 1.5rem;
}

section[aria-label="首屏介绍"] nav ol {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  flex-wrap: wrap;
}

section[aria-label="首屏介绍"] nav ol li {
  color: rgba(255, 255, 255, 0.7);
}

section[aria-label="首屏介绍"] nav ol li a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: underline;
  text-underline-offset: 3px;
}

section[aria-label="首屏介绍"] nav ol li a:hover {
  color: #fff;
}

section[aria-label="首屏介绍"] nav ol li + li::before {
  content: '/';
  margin-right: 0.5rem;
  color: rgba(255, 255, 255, 0.4);
}

section#about {
  padding: 3.5rem 2.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  margin-top: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

section#products {
  padding: 3.5rem 0;
}

section#products h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

section#products h4 {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-top: 0.75rem;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

section#products h4::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(46, 49, 146, 0.04), rgba(255, 107, 157, 0.03));
  opacity: 0;
  transition: opacity var(--transition-base);
}

section#products h4:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

section#products h4:hover::before {
  opacity: 1;
}

section#products h4 + p {
  padding: 0 1.5rem 0.5rem;
  margin-top: 0.5rem;
}

section#solutions {
  padding: 3.5rem 2.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

section#solutions h3 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

section#solutions h3::before {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  flex-shrink: 0;
}

section#cases {
  padding: 3.5rem 0;
}

section#cases h3 {
  margin-bottom: 1rem;
}

section#cases p {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--secondary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
}

section#cases p:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

section#news {
  padding: 3.5rem 0;
}

section#news article {
  padding: 1.75rem 2rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

section#news article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

section#news article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

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

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

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

section#news article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

section#news article p a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

section#news article p a:hover {
  color: var(--accent);
  gap: 0.6rem;
}

section#news article p a:hover::after {
  transform: translateX(3px);
}

section#articles {
  padding: 3.5rem 0;
}

section#articles > p {
  margin-bottom: 1.5rem;
}

section#articles article {
  padding: 1.5rem 1.75rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

section#articles article::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, rgba(46, 49, 146, 0.06), transparent 70%);
  border-radius: 0 0 0 80px;
  transition: width var(--transition-slow), height var(--transition-slow);
}

section#articles article:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: rgba(46, 49, 146, 0.15);
}

section#articles article:hover::after {
  width: 120px;
  height: 120px;
}

section#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  transition: color var(--transition-fast);
}

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

section#articles article p:first-of-type {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

section#articles article p a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

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

section#articles article p a:hover {
  color: var(--accent);
  gap: 0.6rem;
}

section#articles article p a:hover::after {
  transform: translateX(3px);
}

section#howto {
  padding: 3.5rem 2.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

section#howto ol {
  counter-reset: step-counter;
  margin: 1.25rem 0;
  padding: 0;
}

section#howto ol li {
  counter-increment: step-counter;
  position: relative;
  padding: 1rem 1.25rem 1rem 3.5rem;
  margin-bottom: 0.75rem;
  background: var(--bg-body);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

section#howto ol li::before {
  content: counter(step-counter);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(46, 49, 146, 0.25);
}

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

section#faq {
  padding: 3.5rem 0;
}

section#faq article {
  padding: 1.25rem 1.75rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  margin-bottom: 0.875rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

section#faq article::before {
  content: 'Q';
  position: absolute;
  top: 1rem;
  left: 1.75rem;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--primary);
  background: rgba(46, 49, 146, 0.08);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

section#faq article:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(46, 49, 146, 0.15);
}

section#faq article:hover::before {
  background: var(--primary);
  color: #fff;
}

section#faq article h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  padding-left: 2rem;
  font-size: 1.05rem;
  transition: color var(--transition-fast);
}

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

section#faq article p {
  padding-left: 2rem;
  margin-bottom: 0;
  font-size: 0.925rem;
}

section#contact {
  padding: 3.5rem 2.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  margin-top: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

section#contact dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.6rem 1.5rem;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: var(--bg-body);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

section#contact dt {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
  white-space: nowrap;
}

section#contact dd {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

section#contact dd a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

section#contact dd a:hover {
  color: var(--accent);
}

section[aria-label="网站地图"],
section[aria-label="友情链接"] {
  padding: 2.5rem 0;
}

section[aria-label="网站地图"] ul,
section[aria-label="友情链接"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 1rem;
}

section[aria-label="网站地图"] ul li a,
section[aria-label="友情链接"] ul li a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

section[aria-label="网站地图"] ul li a:hover,
section[aria-label="友情链接"] ul li a:hover {
  color: var(--text-inverse);
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(46, 49, 146, 0.25);
}

footer {
  position: relative;
  z-index: 1;
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  margin-top: 3rem;
  padding: 3rem 0 2rem;
  transition: background var(--transition-base), border-color var(--transition-base);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 1.5rem;
  opacity: 1;
  transform: none;
}

footer > section h2 {
  font-size: 1.05rem;
  padding-bottom: 0.4rem;
  margin-bottom: 0.6rem;
}

footer > section h2::after {
  width: 28px;
  height: 2px;
}

footer > section p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

footer > p {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.8;
}

footer > p:last-child {
  margin-top: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
}

footer > p:last-child::before {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  margin: 0 auto 1rem;
}

@media (max-width: 900px) {
  :root {
    --header-height: 60px;
  }

  header nav {
    flex-wrap: wrap;
    height: auto;
    padding: 0.75rem 1.25rem;
    gap: 0.5rem;
  }

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

  header nav ul li a {
    font-size: 0.8rem;
    padding: 0.35rem 0.6rem;
  }

  section[aria-label="首屏介绍"] {
    padding: 3rem 1.75rem;
    margin-top: 1rem;
  }

  section#about,
  section#solutions,
  section#howto,
  section#contact {
    padding: 2.5rem 1.75rem;
    border-radius: var(--radius-lg);
  }

  section#contact dl {
    grid-template-columns: 1fr;
    gap: 0.25rem 0;
  }

  section#contact dt {
    margin-top: 0.6rem;
  }
}

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

  main {
    padding: 0 1rem;
  }

  section {
    padding: 2.5rem 0;
  }

  section[aria-label="首屏介绍"] {
    padding: 2.25rem 1.25rem;
    border-radius: var(--radius-lg);
  }

  section[aria-label="首屏介绍"] h1 {
    font-size: 1.5rem;
  }

  section[aria-label="首屏介绍"] p {
    font-size: 0.925rem;
  }

  section#about,
  section#solutions,
  section#howto,
  section#contact {
    padding: 2rem 1.25rem;
    border-radius: var(--radius-lg);
  }

  section#news article,
  section#articles article,
  section#faq article {
    padding: 1.25rem 1.25rem;
    border-radius: var(--radius-md);
  }

  section#faq article::before {
    left: 1.25rem;
  }

  section#faq article h3,
  section#faq article p {
    padding-left: 1.75rem;
  }

  section#howto ol li {
    padding: 0.85rem 1rem 0.85rem 3rem;
  }

  section#howto ol li::before {
    left: 0.75rem;
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
  }

  section[aria-label="网站地图"] ul,
  section[aria-label="友情链接"] ul {
    gap: 0.4rem 0.6rem;
  }

  section[aria-label="网站地图"] ul li a,
  section[aria-label="友情链接"] ul li a {
    font-size: 0.8rem;
    padding: 0.3rem 0.7rem;
  }

  footer {
    padding: 2rem 0 1.5rem;
  }

  footer > section {
    padding: 0 1rem 1.25rem;
  }

  footer > p {
    padding: 0 1rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 400px) {
  header nav ul li a {
    font-size: 0.75rem;
    padding: 0.3rem 0.45rem;
  }

  section[aria-label="首屏介绍"] {
    padding: 1.75rem 1rem;
  }

  section[aria-label="首屏介绍"] h1 {
    font-size: 1.35rem;
  }
}

@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,
  section[aria-label="网站地图"],
  section[aria-label="友情链接"] {
    display: none;
  }

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

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