:root {
  --primary: #e94560;
  --primary-dark: #c73a52;
  --primary-light: #ff6b84;
  --secondary: #f2c94c;
  --secondary-dark: #d4a832;
  --accent: #0f3460;
  --accent-light: #1a4a7a;
  --bg-deep: #1a1a2e;
  --bg-mid: #16213e;
  --bg-light: #f8f9fc;
  --bg-card: #ffffff;
  --bg-card-alt: #f0f2f8;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888a0;
  --text-inverse: #ffffff;
  --border-color: #e2e5ef;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 4px 20px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 8px 40px rgba(26, 26, 46, 0.16);
  --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.3);
  --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: 0.3s 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;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
  --header-height: 72px;
  --max-width: 1200px;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: 20px;
}

[data-theme="dark"] {
  --primary: #ff6b84;
  --primary-dark: #e94560;
  --primary-light: #ff8fa3;
  --secondary: #f2c94c;
  --secondary-dark: #d4a832;
  --accent: #1a4a7a;
  --accent-light: #2a6aaa;
  --bg-deep: #0d0d1a;
  --bg-mid: #12122a;
  --bg-light: #1a1a2e;
  --bg-card: #1e1e36;
  --bg-card-alt: #252545;
  --text-primary: #eaeaf5;
  --text-secondary: #a8a8c8;
  --text-muted: #6a6a8a;
  --text-inverse: #1a1a2e;
  --border-color: #2e2e4e;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(255, 107, 132, 0.25);
  --glass-bg: rgba(30, 30, 54, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);
}

*,
*::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%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(233, 69, 96, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(15, 52, 96, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body::before {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(255, 107, 132, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(42, 106, 170, 0.04) 0%, transparent 50%);
}

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(--primary-dark);
}

[data-theme="dark"] a:hover {
  color: var(--primary-light);
}

ul,
ol {
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.4em;
}

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

h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
h2 { font-size: clamp(1.3rem, 3vw, 1.8rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.35rem); }
h4 { font-size: 1.1rem; }

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

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

time {
  font-size: 0.875rem;
  color: var(--text-muted);
}

blockquote {
  margin: 1.2em 0;
  padding: 1.2em 1.5em;
  border-left: 4px solid var(--primary);
  background: var(--bg-card-alt);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

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

details {
  margin-bottom: 0.75em;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

details:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

details[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

summary {
  padding: 1em 1.25em;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast);
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 1.3em;
  font-weight: 400;
  color: var(--primary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: 1em;
}

details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

summary:hover {
  background: var(--bg-card-alt);
}

details > p,
details > div {
  padding: 0 1.25em 1.25em;
  margin-bottom: 0;
  animation: fadeSlideIn 0.3s ease forwards;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

header#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand svg {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.brand:hover svg {
  transform: rotate(15deg) scale(1.05);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-slogan {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
}

nav#main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

nav#main-nav ul {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 2px;
  flex-wrap: wrap;
}

nav#main-nav li {
  margin: 0;
}

nav#main-nav a {
  display: block;
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

nav#main-nav a::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-base), left var(--transition-base);
  border-radius: 2px;
}

nav#main-nav a:hover {
  color: var(--primary);
  background: rgba(233, 69, 96, 0.06);
}

nav#main-nav a:hover::after {
  width: 60%;
  left: 20%;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

form#site-search {
  display: flex;
  align-items: center;
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

form#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.12);
}

form#site-search input {
  border: none;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text-primary);
  width: 160px;
  outline: none;
  font-family: inherit;
}

form#site-search input::placeholder {
  color: var(--text-muted);
}

form#site-search button {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
  font-family: inherit;
  white-space: nowrap;
}

form#site-search button:hover {
  background: var(--primary-dark);
}

button#theme-toggle,
button#menu-toggle {
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  white-space: nowrap;
}

button#theme-toggle:hover,
button#menu-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(233, 69, 96, 0.06);
  transform: translateY(-1px);
}

button#menu-toggle {
  display: none;
}

nav[aria-label="面包屑导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 20px 0;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 0.8rem;
}

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

nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin: 0 8px;
  color: var(--text-muted);
  font-size: 1em;
}

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

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 60px;
  position: relative;
  z-index: 1;
}

main > section {
  margin-top: 48px;
  padding: 32px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
  opacity: 0;
  transform: translateY(30px);
}

main > section.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1), box-shadow var(--transition-base), border-color var(--transition-base);
}

main > section:hover {
  box-shadow: var(--shadow-md);
}

main > section > h2 {
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

main > section > h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

main > section > h3 {
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

main > section > h3:first-of-type {
  margin-top: 16px;
}

#hero {
  margin-top: 24px;
  padding: 40px 32px;
  background: linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-mid) 40%, var(--accent) 100%);
  border: none;
  color: var(--text-inverse);
  position: relative;
  overflow: hidden;
}

#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(242, 201, 76, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 50% 80%, rgba(15, 52, 96, 0.2) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(2%, -2%) scale(1.05); }
  100% { transform: translate(-2%, 2%) scale(1); }
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  color: #ffffff;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

#hero > p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  max-width: 900px;
  margin-bottom: 28px;
  line-height: 1.8;
}

#banner-carousel {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 28px;
  box-shadow: var(--shadow-lg);
  background: rgba(0, 0, 0, 0.2);
}

#banner-carousel .slide {
  display: none;
  animation: slideFadeIn 0.6s ease forwards;
}

#banner-carousel .slide.active {
  display: block;
}

@keyframes slideFadeIn {
  from {
    opacity: 0;
    transform: scale(1.02);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

#banner-carousel svg {
  width: 100%;
  height: auto;
  display: block;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-stats li {
  text-align: center;
  padding: 18px 12px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
  transition: all var(--transition-base);
  margin: 0;
}

.hero-stats li:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.hero-stats strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 4px;
  text-shadow: 0 0 20px rgba(242, 201, 76, 0.4);
}

#intro ol {
  counter-reset: timeline;
  list-style: none;
  padding: 0;
  position: relative;
}

#intro ol::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), var(--secondary), var(--accent));
  border-radius: 2px;
}

#intro ol li {
  counter-increment: timeline;
  position: relative;
  padding-left: 36px;
  margin-bottom: 16px;
  padding-bottom: 4px;
}

#intro ol li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--primary);
  transition: all var(--transition-fast);
}

#intro ol li:hover::before {
  background: var(--secondary);
  box-shadow: 0 0 0 2px var(--secondary), 0 0 16px rgba(242, 201, 76, 0.5);
  transform: scale(1.2);
}

#intro ol li strong {
  color: var(--primary);
  margin-right: 4px;
}

#products h3 {
  padding-left: 14px;
  border-left: 3px solid var(--primary);
}

#advantages h3 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

#advantages h3::before {
  content: "✦";
  color: var(--secondary);
  font-size: 0.9em;
}

#solutions ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

#solutions ul li {
  padding: 14px 18px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  margin: 0;
}

#solutions ul li:hover {
  border-left-color: var(--primary);
  background: rgba(233, 69, 96, 0.06);
  transform: translateX(4px);
}

#cases blockquote {
  position: relative;
  padding-left: 3em;
}

#cases blockquote::before {
  content: "\201C";
  position: absolute;
  left: 12px;
  top: 8px;
  font-size: 3em;
  line-height: 1;
  color: var(--primary);
  opacity: 0.3;
  font-family: Georgia, serif;
}

#news ul {
  list-style: none;
  padding: 0;
}

#news ul li {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

#news ul li:last-child {
  border-bottom: none;
}

#news ul li:hover {
  background: var(--bg-card-alt);
  padding-left: 24px;
  color: var(--text-primary);
}

#news ul li time {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--primary);
  font-weight: 600;
  min-width: 90px;
}

#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

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

#articles article {
  padding: 24px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
  background: var(--bg-card);
}

#articles article h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

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

#articles article p {
  font-size: 0.875rem;
  flex: 1;
  margin-bottom: 12px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.875rem;
  margin-top: auto;
  transition: gap var(--transition-fast);
}

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

#articles article a:hover {
  gap: 10px;
}

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

#knowledge h3 {
  margin-top: 24px;
  color: var(--accent);
}

[data-theme="dark"] #knowledge h3 {
  color: var(--primary-light);
}

#faq details {
  margin-bottom: 10px;
}

#howto ol {
  counter-reset: howto;
  list-style: none;
  padding: 0;
}

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: 14px 16px 14px 56px;
  margin-bottom: 10px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: 0.9rem;
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}

#howto ol li:hover {
  background: rgba(233, 69, 96, 0.06);
  transform: translateX(4px);
}

#howto ul {
  list-style: none;
  padding: 0;
}

#howto ul li {
  padding: 8px 0 8px 24px;
  position: relative;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

#howto ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

#howto h3:last-of-type + p {
  padding: 20px;
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.08), rgba(242, 201, 76, 0.08));
  border-radius: var(--radius-md);
  border: 1px solid rgba(233, 69, 96, 0.15);
  font-weight: 500;
  color: var(--text-primary);
}

#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

#contact address p {
  padding: 14px 18px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-sm);
  margin: 0;
  font-size: 0.9rem;
  border-left: 3px solid var(--primary);
  transition: all var(--transition-fast);
}

#contact address p:hover {
  border-left-color: var(--secondary);
  background: rgba(242, 201, 76, 0.06);
}

#contact address a {
  font-weight: 600;
}

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap ul li,
#links ul li {
  margin: 0;
}

#sitemap ul a,
#links ul a {
  display: inline-block;
  padding: 8px 18px;
  background: var(--bg-card-alt);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

#sitemap ul a:hover,
#links ul a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(233, 69, 96, 0.3);
}

#editorial p {
  padding: 20px;
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  border-left: 3px solid var(--secondary);
}

footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.75);
  padding: 48px 20px 24px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent), var(--primary));
  background-size: 300% 100%;
  animation: gradientShift 6s linear infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 28px;
}

footer h2 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 8px;
}

footer h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

footer p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.875rem;
  line-height: 1.8;
  margin-bottom: 8px;
}

footer small {
  display: block;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
}

button#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
  z-index: 999;
}

button#back-to-top::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  border-top: 2px solid #fff;
  border-left: 2px solid #fff;
  transform: translate(-50%, -30%) rotate(45deg);
}

button#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

button#back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(233, 69, 96, 0.5);
}

button#back-to-top:active {
  transform: translateY(-2px) scale(0.95);
}

@media (max-width: 1024px) {
  :root {
    --header-height: 64px;
  }

  nav#main-nav ul {
    gap: 0;
  }

  nav#main-nav a {
    padding: 6px 8px;
    font-size: 0.8rem;
  }

  form#site-search input {
    width: 120px;
  }
}

@media (max-width: 900px) {
  button#menu-toggle {
    display: block;
  }

  nav#main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 20px;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
  }

  nav#main-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  nav#main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  nav#main-nav a {
    padding: 12px 16px;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
  }

  nav#main-nav a::after {
    display: none;
  }

  form#site-search input {
    width: 100px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  #articles {
    grid-template-columns: 1fr;
  }

  main > section {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  #hero {
    padding: 28px 20px;
  }
}

@media (max-width: 600px) {
  :root {
    --header-height: 56px;
  }

  html {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 12px;
    gap: 10px;
  }

  .brand-text {
    display: none;
  }

  .brand svg {
    width: 34px;
    height: 34px;
  }

  form#site-search {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  button#theme-toggle,
  button#menu-toggle {
    padding: 7px 12px;
    font-size: 0.75rem;
  }

  nav[aria-label="面包屑导航"] {
    padding: 10px 12px 0;
    font-size: 0.75rem;
  }

  main {
    padding: 0 12px 40px;
  }

  main > section {
    margin-top: 28px;
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }

  #hero {
    margin-top: 16px;
    padding: 24px 16px;
  }

  #hero h1 {
    font-size: 1.35rem;
  }

  #hero > p {
    font-size: 0.9rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .hero-stats li {
    padding: 14px 8px;
    font-size: 0.75rem;
  }

  .hero-stats strong {
    font-size: 1.4rem;
  }

  #banner-carousel svg {
    height: 160px;
  }

  #knowledge h3 {
    font-size: 1rem;
  }

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

  #sitemap ul a,
  #links ul a {
    padding: 6px 14px;
    font-size: 0.8rem;
  }

  #news ul li {
    flex-direction: column;
    gap: 4px;
  }

  #news ul li time {
    min-width: auto;
  }

  button#back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  footer {
    padding: 32px 16px 20px;
  }
}

@media (max-width: 380px) {
  .hero-stats {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .hero-stats li {
    padding: 10px 6px;
  }

  .hero-stats strong {
    font-size: 1.2rem;
  }

  button#theme-toggle,
  button#menu-toggle {
    padding: 6px 10px;
    font-size: 0.7rem;
  }
}

@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;
  }

  main > section {
    opacity: 1;
    transform: none;
  }
}

@media print {
  header#site-header,
  nav#main-nav,
  button#back-to-top,
  button#theme-toggle,
  button#menu-toggle,
  form#site-search,
  #banner-carousel {
    display: none !important;
  }

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

  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    opacity: 1;
    transform: none;
  }
}

::selection {
  background: rgba(233, 69, 96, 0.25);
  color: var(--text-primary);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

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

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

@supports not (backdrop-filter: blur(20px)) {
  header#site-header {
    background: var(--bg-card);
  }

  nav#main-nav {
    background: var(--bg-card);
  }
}