```css
/* ---------- 51爆料 专属样式系统 ---------- */
:root {
  --bg-page: #FFF9F0;
  --bg-soft: #FFF3E0;
  --bg-card: #FFFFFF;
  --bg-header: rgba(255, 255, 255, 0.85);
  --bg-footer: #1A1A2E;
  --text-strong: #2D1B4E;
  --text-body: #3D2C5A;
  --text-secondary: #5D4A7A;
  --text-tertiary: #7A6A8A;
  --text-link: #FF6B6B;
  --text-link-hover: #E74C3C;
  --text-button: #FFFFFF;
  --bg-button: linear-gradient(135deg, #FF6B6B, #FF8E53);
  --border-color: rgba(255, 107, 107, 0.2);
  --shadow-color: rgba(255, 107, 107, 0.12);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --footer-text: #E8D5F5;
  --footer-text-secondary: #C9B8D8;
  --banner-gradient: linear-gradient(145deg, #FFF0E6 0%, #FFE0D1 50%, #FFD1C1 100%);
  --svg-bg: #FFE8D6;
  --svg-fill: #FF6B6B;
  --accent-light: #FFE0D1;
  --accent-mid: #FFB199;
  --accent-glow: rgba(255, 107, 107, 0.25);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-page: #1A1025;
  --bg-soft: #2D1B4E;
  --bg-card: #2A1B3E;
  --bg-header: rgba(26, 16, 37, 0.85);
  --bg-footer: #0F0717;
  --text-strong: #F3E8FF;
  --text-body: #E8D5F5;
  --text-secondary: #C9B8D8;
  --text-tertiary: #A995BC;
  --text-link: #FF8E8E;
  --text-link-hover: #FFB199;
  --text-button: #1A1025;
  --bg-button: linear-gradient(135deg, #FFB199, #FF6B6B);
  --border-color: rgba(255, 142, 142, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.4);
  --nav-bg: rgba(26, 16, 37, 0.85);
  --footer-text: #F3E8FF;
  --footer-text-secondary: #C9B8D8;
  --banner-gradient: linear-gradient(145deg, #2D1B4E 0%, #3D2C5A 50%, #4A3A6A 100%);
  --svg-bg: #3D2C5A;
  --svg-fill: #FFB199;
  --accent-light: #3D2C5A;
  --accent-mid: #FF6B6B;
  --accent-glow: rgba(255, 107, 107, 0.2);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.3s ease, transform 0.3s ease, opacity 0.3s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-page);
  background-image: radial-gradient(circle at 15% 20%, var(--accent-glow) 0%, transparent 40%),
                    radial-gradient(circle at 85% 75%, var(--accent-glow) 0%, transparent 35%);
  background-attachment: fixed;
  color: var(--text-body);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-soft); }
::-webkit-scrollbar-thumb { 
  background: linear-gradient(180deg, var(--accent-mid), var(--text-link));
  border-radius: 10px;
  border: 2px solid var(--bg-page);
}
::-webkit-scrollbar-thumb:hover { background: var(--text-link); }

/* ---------- 标题系统 ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-strong);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  position: relative;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  background: linear-gradient(135deg, var(--text-strong) 0%, var(--text-link) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  padding-left: 1rem;
  border-left: 5px solid var(--text-link);
  margin: 2.5rem 0 1.5rem;
  overflow: hidden;
}

h2::after {
  content: '';
  display: inline-block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--text-link), transparent);
  border-radius: 4px;
  vertical-align: middle;
  margin-left: 1rem;
  opacity: 0.6;
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  margin-bottom: 0.8rem;
}

h4 {
  font-size: clamp(1.1rem, 1.8vw, 1.25rem);
  margin-bottom: 0.6rem;
  font-weight: 700;
}

p {
  color: var(--text-body);
  margin-bottom: 1.2rem;
  line-height: 1.8;
}

/* ---------- 链接 ---------- */
a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
  border-bottom: 2px solid transparent;
}

a:hover {
  color: var(--text-link-hover);
  border-bottom-color: var(--text-link);
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  padding: 0.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.logo {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text-strong);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  border-bottom: none;
}

.logo span {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo:hover { transform: scale(1.02); }

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  color: var(--text-body);
  font-weight: 600;
  border-bottom: none;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  position: relative;
  transition: var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--text-link), #FF8E53);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--text-link);
  background: var(--accent-light);
}

.nav-links a:hover::after { width: 80%; }

#themeToggle {
  background: var(--accent-light);
  border: 2px solid var(--border-color);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-strong);
}

#themeToggle:hover {
  transform: rotate(10deg) scale(1.05);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-strong);
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 8px;
  transition: var(--transition);
}

.menu-toggle:hover { background: var(--accent-light); }

/* ---------- Banner ---------- */
.banner {
  background: var(--banner-gradient);
  padding: 3.5rem;
  border-radius: 30px;
  margin: 2rem 0;
  box-shadow: 0 20px 40px var(--shadow-color);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.banner::before {
  content: '🍉';
  position: absolute;
  font-size: 12rem;
  opacity: 0.08;
  right: -2rem;
  bottom: -3rem;
  transform: rotate(-15deg);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(-15deg); }
  50% { transform: translateY(-15px) rotate(-15deg); }
}

.banner h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 1.2rem;
  -webkit-text-fill-color: initial;
  background: none;
  color: var(--text-strong);
}

.banner p {
  font-size: 1.2rem;
  max-width: 800px;
  color: var(--text-body);
  opacity: 0.9;
}

.banner strong {
  color: var(--text-link);
  font-weight: 700;
}

/* ---------- 卡片通用 ---------- */
.card, .article-card, .faq-item, .case-card, .info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 8px 30px var(--shadow-color);
  color: var(--text-body);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.card::before, .article-card::before, .case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--text-link), #FF8E53);
  opacity: 0;
  transition: var(--transition);
}

.card:hover, .article-card:hover, .case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 40px var(--accent-glow);
  border-color: var(--text-link);
}

.card:hover::before, .article-card:hover::before, .case-card:hover::before {
  opacity: 1;
}

.card h3, .card h4, .article-card h3, .faq-item h4 {
  color: var(--text-strong);
  margin-bottom: 0.8rem;
}

/* ---------- 网格布局 ---------- */
.grid-2, .grid-3 {
  display: grid;
  gap: 1.8rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* ---------- 服务卡片 ---------- */
#services .card {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

#services .card h4 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

#services .card h4::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--text-link), #FF8E53);
  border-radius: 3px;
  transform: scaleX(0);
  transition: var(--transition);
}

#services .card:hover h4::after { transform: scaleX(1); }

/* ---------- 解决方案区块 ---------- */
#services + section > div {
  background: var(--bg-soft);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

#services + section > div::after {
  content: '💡';
  position: absolute;
  right: 1rem;
  top: 1rem;
  font-size: 4rem;
  opacity: 0.1;
  transform: rotate(15deg);
}

/* ---------- 文章卡片 ---------- */
.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition);
}

.article-card p:first-of-type {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.article-card p:not(:first-of-type) {
  flex-grow: 1;
  color: var(--text-body);
}

.article-card a {
  margin-top: 1rem;
  align-self: flex-start;
  color: var(--text-link);
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  background: var(--accent-light);
  transition: var(--transition);
}

.article-card a:hover {
  background: linear-gradient(135deg, var(--text-link), #FF8E53);
  color: white;
  transform: translateX(5px);
}

/* ---------- FAQ ---------- */
.faq-item {
  margin-bottom: 1rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  transition: var(--transition);
  border-left: 4px solid transparent;
}

.faq-item:hover {
  border-left-color: var(--text-link);
  transform: translateX(5px);
}

.faq-item h4 {
  font-size: 1.05rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.faq-answer {
  color: var(--text-body);
  padding: 0.8rem 1rem;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  margin-top: 0.5rem;
  font-size: 0.95rem;
  border-left: 3px solid var(--text-link);
  opacity: 0.9;
}

/* ---------- HowTo 教程 ---------- */
#howto .card {
  background: var(--bg-card);
  border-left: 6px solid var(--text-link);
}

#howto ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

#howto ol li {
  margin-bottom: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

#howto ol li:hover {
  transform: translateX(5px);
  background: var(--accent-light);
}

/* ---------- 搜索区 ---------- */
section > div[style*="display: flex"] {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  padding: 0.5rem;
  box-shadow: 0 4px 15px var(--shadow-color);
}

input[type="text"] {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-body);
  font-size: 1rem;
  padding: 0.8rem 1.2rem;
}

input[type="text"]::placeholder {
  color: var(--text-tertiary);
}

input[type="text"]:focus {
  box-shadow: 0 0 0 2px var(--text-link);
  border-radius: 50px;
}

/* ---------- 按钮 ---------- */
.btn, button, .tag {
  background: var(--bg-button);
  color: var(--text-button);
  padding: 0.7rem 1.6rem;
  border-radius: 50px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn:hover, button:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px var(--accent-glow);
  opacity: 0.95;
}

.btn:active, button:active {
  transform: translateY(0) scale(0.98);
}

section > div[style*="display: flex"] button {
  background: linear-gradient(135deg, var(--text-link), #FF8E53);
  color: white;
}

/* ---------- 表格 ---------- */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--bg-card);
  color: var(--text-body);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 4px 15px var(--shadow-color);
}

th {
  background: var(--bg-soft);
  color: var(--text-strong);
  font-weight: 700;
  text-align: left;
  padding: 1rem 1.5rem;
  border-bottom: 2px solid var(--border-color);
}

td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-body);
}

tr:hover td {
  background: var(--accent-light);
  transition: var(--transition);
}

tr:last-child td { border-bottom: none; }

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(135deg, var(--text-link), #FF8E53);
  color: white;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: 0 8px 20px var(--accent-glow);
  z-index: 999;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

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

.back-to-top:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: 0 12px 30px var(--accent-glow);
}

/* ---------- 页脚 ---------- */
footer {
  background: var(--bg-footer);
  color: var(--footer-text);
  padding: 3.5rem 2rem 1.5rem;
  margin-top: 4rem;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--text-link), #FF8E53, var(--text-link));
  background-size: 200% 100%;
  animation: gradientMove 3s ease infinite;
}

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

footer a {
  color: var(--footer-text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

footer a:hover {
  color: #FFB199;
  border-bottom-color: #FFB199;
}

.footer-flex {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.footer-col {
  flex: 1;
  min-width: 250px;
}

.footer-col h4 {
  color: #FFFFFF;
  border-bottom: 2px solid #FF6B6B;
  padding-bottom: 0.5rem;
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.footer-col p, .footer-col li {
  color: var(--footer-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.footer-col ul {
  list-style: none;
  padding-left: 0;
}

.footer-col ul li {
  margin-bottom: 0.5rem;
}

.footer-col ul li a {
  padding: 0.2rem 0;
  display: inline-block;
}

.copyright {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--footer-text-secondary);
  font-size: 0.9rem;
}

.copyright p {
  color: var(--footer-text-secondary);
  margin-bottom: 0.5rem;
}

.copyright a {
  color: var(--footer-text-secondary);
  margin: 0 0.5rem;
  font-size: 0.9rem;
}

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 暗色模式适配 ---------- */
[data-theme="dark"] .card,
[data-theme="dark"] .article-card,
[data-theme="dark"] .faq-item {
  background: var(--bg-card);
  color: var(--text-body);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] footer {
  background: var(--bg-footer);
}

[data-theme="dark"] .banner {
  background: var(--banner-gradient);
  border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .banner h1,
[data-theme="dark"] .banner p {
  color: var(--text-strong);
}

[data-theme="dark"] .nav-links a {
  color: var(--text-body);
}

[data-theme="dark"] .nav-links a:hover {
  color: var(--text-link);
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .logo {
  color: var(--text-strong);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0.8rem 1rem;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 1rem;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px var(--shadow-color);
    margin-top: 1rem;
  }
  
  .nav-links.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }
  
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  
  .menu-toggle {
    display: block;
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  
  .banner {
    padding: 2rem;
    border-radius: 20px;
  }
  
  .banner::before {
    font-size: 6rem;
    opacity: 0.05;
  }
  
  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
  }
  
  .footer-flex {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .copyright {
    margin-top: 2rem;
    padding-top: 1rem;
  }
  
  .card, .article-card, .faq-item, .case-card, .info-card {
    padding: 1.5rem;
  }
  
  section > div[style*="display: flex"] {
    flex-direction: column;
    border-radius: 20px;
  }
  
  section > div[style*="display: flex"] input {
    width: 100%;
  }
  
  section > div[style*="display: flex"] button {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  
  .container, main {
    padding: 0 0.8rem;
  }
  
  .card, .article-card, .faq-item {
    padding: 1.2rem;
    border-radius: 16px;
  }
  
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.15rem; }
  
  .banner {
    padding: 1.5rem;
    margin: 1rem 0;
  }
  
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
  
  .nav-links a {
    padding: 0.6rem 1rem;
  }
  
  footer {
    padding: 2rem 1rem 1rem;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* ---------- 打印 ---------- */
@media print {
  .navbar, .back-to-top, #themeToggle, .menu-toggle {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card, .article-card, .faq-item {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}
```