```css
:root {
  --bg-body: #f8f5f0;
  --bg-soft: #f0e6d6;
  --bg-card: rgba(255, 255, 255, 0.85);
  --text-primary: #2d1b0e;
  --text-secondary: #4a3b2a;
  --text-accent: #b45309;
  --border-light: #d4c4a8;
  --nav-bg: rgba(255, 255, 255, 0.8);
  --footer-bg: #1a1208;
  --footer-text: #e8dcc8;
  --shadow-sm: 0 2px 8px rgba(45, 27, 14, 0.06);
  --shadow-md: 0 4px 20px rgba(45, 27, 14, 0.08);
  --shadow-lg: 0 8px 32px rgba(45, 27, 14, 0.12);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.8);
  --gradient-hero: linear-gradient(135deg, #fdf6ec 0%, #f5e1c0 50%, #e8c9a0 100%);
}

[data-theme="dark"] {
  --bg-body: #0f0c08;
  --bg-soft: #1a140e;
  --bg-card: rgba(30, 24, 18, 0.85);
  --text-primary: #f0e6d8;
  --text-secondary: #d0c4b4;
  --text-accent: #fbbf24;
  --border-light: #3a2f24;
  --nav-bg: rgba(15, 12, 8, 0.85);
  --footer-bg: #0a0806;
  --footer-text: #c8beb0;
  --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 32px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(30, 24, 18, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --gradient-hero: linear-gradient(135deg, #1a140e 0%, #2a1f14 50%, #3a2a1a 100%);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--text-accent) var(--bg-soft);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.4s ease, color 0.3s ease;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse at 20% 50%, rgba(180, 83, 9, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(180, 83, 9, 0.02) 0%, transparent 50%);
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.02'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.5;
}

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

::-webkit-scrollbar-track {
  background: var(--bg-soft);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--text-accent);
  border-radius: 4px;
  opacity: 0.7;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-accent);
  opacity: 1;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.5rem); }
h4 { font-size: clamp(1rem, 2.5vw, 1.25rem); }

p, li, .article-card, .faq-item, .howto-step, .case-item, .meta-info, .breadcrumb, .footer a, .description, .news-snippet {
  color: var(--text-secondary);
}

a {
  color: var(--text-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease, text-shadow 0.3s ease;
  position: relative;
}

a:hover {
  color: var(--text-accent);
  text-shadow: 0 0 20px rgba(180, 83, 9, 0.2);
}

[data-theme="dark"] a {
  color: #fbbf24;
}

[data-theme="dark"] a:hover {
  color: #fcd34d;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Glass effect utility */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

/* Buttons */
.btn {
  background: linear-gradient(135deg, #b45309, #d97706);
  color: #fff;
  padding: 0.7rem 1.8rem;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 15px rgba(180, 83, 9, 0.3);
  letter-spacing: 0.03em;
  font-size: 0.95rem;
  display: inline-block;
  text-align: center;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(180, 83, 9, 0.4);
}

.btn:hover::before {
  left: 100%;
}

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

[data-theme="dark"] .btn {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: #0f172a;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

[data-theme="dark"] .btn:hover {
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
}

/* Header & Navigation */
header {
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s ease;
}

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 24px;
  max-width: 1280px;
  margin: 0 auto;
  position: relative;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary), var(--text-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo::before {
  content: '⚡';
  font-size: 1.8rem;
  -webkit-text-fill-color: initial;
}

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

.nav-links li {
  position: relative;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
  transition: color 0.3s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--text-accent);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

.nav-links a:hover::after {
  width: 100%;
}

[data-theme="dark"] .nav-links a {
  color: #f8fafc;
}

[data-theme="dark"] .nav-links a:hover {
  color: #fbbf24;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: transform 0.3s ease;
  padding: 0.5rem;
}

.menu-toggle:hover {
  transform: rotate(90deg);
}

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--border-light);
  border-radius: 50px;
  padding: 0.4rem 1rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  background: var(--bg-soft);
  transform: scale(1.05);
}

/* Mobile Menu */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .menu-toggle {
    display: block;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero Section */
.hero {
  background: var(--gradient-hero);
  padding: 5rem 0;
  border-radius: 0 0 40px 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '☯';
  position: absolute;
  bottom: 20px;
  right: 40px;
  font-size: 8rem;
  opacity: 0.05;
  animation: spin 30s linear infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

[data-theme="dark"] .hero {
  background: var(--gradient-hero);
}

.hero-content {
  position: relative;
  z-index: 2;
  animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-content p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 800px;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  margin-top: 2rem;
  gap: 3rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: 1.5rem 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 16px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s ease;
  min-width: 150px;
}

.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.stat-item h3 {
  font-size: 2.5rem;
  color: var(--text-accent);
  margin-bottom: 0.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-accent), #d97706);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item span {
  font-size: 0.9rem;
  opacity: 0.8;
}

.svg-placeholder {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 16px;
  width: 100%;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-weight: 500;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  margin-top: 2rem;
  transition: all 0.4s ease;
  overflow: hidden;
}

.svg-placeholder:hover {
  box-shadow: var(--shadow-md);
  transform: scale(1.01);
}

/* Sections */
.section-title {
  margin: 4rem 0 2rem;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  border-left: 5px solid var(--text-accent);
  padding-left: 1.5rem;
  position: relative;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 1.5rem;
  bottom: -8px;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--text-accent), transparent);
  border-radius: 3px;
}

[data-theme="dark"] .section-title {
  border-color: #fbbf24;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2.5rem 0;
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 2rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--text-accent), #d97706, var(--text-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--text-accent);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
  position: relative;
}

.card p {
  font-size: 1rem;
  line-height: 1.8;
}

/* Article List */
.article-list {
  list-style: none;
}

.article-item {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
  position: relative;
  padding-left: 1.5rem;
}

.article-item::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--text-accent);
  transition: transform 0.3s ease;
}

.article-item:hover {
  padding-left: 2rem;
  background: var(--bg-soft);
  border-radius: 8px;
}

.article-item:hover::before {
  transform: translateX(5px);
}

.article-item a {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.article-item a:hover {
  color: var(--text-accent);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  opacity: 0.8;
  margin-top: 0.3rem;
}

/* FAQ */
.faq-item {
  margin-bottom: 1rem;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  background: var(--bg-card);
}

.faq-item:hover {
  border-color: var(--text-accent);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--text-primary);
  padding: 1.2rem 1.5rem;
  transition: all 0.3s ease;
  background: transparent;
}

.faq-question:hover {
  background: var(--bg-soft);
}

.faq-question span {
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  display: inline-block;
  color: var(--text-accent);
}

.faq-question:hover span {
  transform: rotate(90deg);
}

.faq-answer {
  padding: 0 1.5rem 1.2rem;
  color: var(--text-secondary);
  line-height: 1.8;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Content blocks */
.content-block {
  margin: 2rem 0;
  padding: 2rem;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-light);
}

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--text-accent), transparent, var(--text-accent));
}

footer .footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
}

footer h4 {
  color: #f8fafc;
  margin-bottom: 1.2rem;
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 0.8rem;
}

footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--text-accent);
}

[data-theme="dark"] footer h4 {
  color: #ffffff;
}

footer a {
  color: #cbd5e1;
  transition: all 0.3s ease;
  display: inline-block;
  padding: 0.2rem 0;
}

footer a:hover {
  color: #fbbf24;
  transform: translateX(5px);
}

[data-theme="dark"] footer a {
  color: #e2e8f0;
}

footer p {
  color: #cbd5e1;
  line-height: 1.8;
}

.copyright {
  border-top: 1px solid #334155;
  margin-top: 3rem;
  padding-top: 2rem;
  text-align: center;
  color: #cbd5e1;
  font-size: 0.9rem;
}

[data-theme="dark"] .copyright {
  color: #94a3b8;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--text-accent), #d97706);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  border: none;
  z-index: 100;
  box-shadow: 0 4px 15px rgba(180, 83, 9, 0.3);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  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 8px 25px rgba(180, 83, 9, 0.4);
}

[data-theme="dark"] .back-to-top {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: #0f172a;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.9rem;
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 30px;
  display: inline-block;
  border: 1px solid var(--glass-border);
}

/* Search box */
.search-box {
  display: flex;
  gap: 0.5rem;
  margin: 1rem 0;
}

.search-box input {
  flex: 1;
  padding: 0.8rem 1.5rem;
  border: 1px solid var(--border-light);
  border-radius: 50px;
  background: var(--bg-card);
  color: var(--text-primary);
  transition: all 0.3s ease;
  outline: none;
}

.search-box input:focus {
  border-color: var(--text-accent);
  box-shadow: 0 0 0 3px rgba(180, 83, 9, 0.1);
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Additional utilities */
.text-muted {
  color: #6b7280 !important;
}

[data-theme="dark"] .text-muted {
  color: #9ca3af !important;
}

.small-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Dark mode specific */
[data-theme="dark"] .svg-placeholder {
  background-color: #1e293b;
  color: #e2e8f0;
}

/* Contact section */
#contact p {
  margin-bottom: 0.8rem;
  padding: 0.8rem 1rem;
  background: var(--bg-soft);
  border-radius: 8px;
  border-left: 3px solid var(--text-accent);
}

/* News section */
.news-snippet {
  padding: 1rem;
  border-left: 3px solid var(--text-accent);
  background: var(--bg-soft);
  border-radius: 8px;
  margin-bottom: 0.8rem;
}

/* Enhanced interactive elements */
button:focus-visible {
  outline: 2px solid var(--text-accent);
  outline-offset: 2px;
}

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

/* Responsive enhancements */
@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 3rem 0;
    border-radius: 0 0 24px 24px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 1rem;
  }
  
  .stat-item {
    min-width: auto;
    padding: 1rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .article-item a {
    font-size: 1rem;
  }
  
  .faq-question {
    font-size: 1rem;
    padding: 1rem;
  }
  
  .faq-answer {
    padding: 0 1rem 1rem;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
  
  .section-title {
    margin: 3rem 0 1.5rem;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
}

/* Print styles */
@media print {
  header, footer, .back-to-top, .theme-toggle, .menu-toggle {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero {
    background: none;
    padding: 1rem 0;
  }
}

/* Loading state */
.loading {
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  border: 3px solid var(--text-accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Scroll progress bar */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--text-accent), #d97706);
  transform-origin: left;
  transform: scaleX(0);
  z-index: 10000;
  transition: transform 0.1s ease;
}
```