```css
/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', sans-serif;
  line-height: 1.7;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ===== CSS Variables ===== */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-footer: #0f172a;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-heading: #0f172a;
  --text-footer: #cbd5e1;
  --border-color: #e2e8f0;
  --accent-color: #4f46e5;
  --accent-hover: #4338ca;
  --accent-gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
  --button-text: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-footer: #0f172a;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-heading: #f8fafc;
  --text-footer: #94a3b8;
  --border-color: #334155;
  --accent-color: #818cf8;
  --accent-hover: #6366f1;
  --accent-gradient: linear-gradient(135deg, #6366f1, #a855f7);
  --button-text: #ffffff;
  --nav-bg: rgba(15, 23, 42, 0.85);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ===== Header & Navigation ===== */
.site-header {
  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);
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.logo a {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: var(--transition);
}

.logo span {
  -webkit-text-fill-color: var(--accent-color);
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
  transition: var(--transition);
}

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

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 50px;
  padding: 4px 8px 4px 16px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  max-width: 200px;
}

.search-box:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px 4px;
  color: var(--text-primary);
  outline: none;
  width: 100%;
  font-size: 0.9rem;
}

.search-box input::placeholder {
  color: var(--text-secondary);
}

.search-box button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1.1rem;
  padding: 8px;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.search-box button:hover {
  color: var(--accent-color);
}

.dark-toggle, .menu-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.dark-toggle:hover, .menu-toggle:hover {
  background: var(--accent-color);
  color: var(--button-text);
  border-color: var(--accent-color);
  transform: rotate(10deg);
}

.menu-toggle {
  display: none;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 8px 0;
  animation: slideDown 0.3s ease;
}

.mobile-nav a {
  padding: 14px 24px;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--border-color);
  font-weight: 500;
  transition: var(--transition);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  background: var(--bg-secondary);
  color: var(--accent-color);
  padding-left: 32px;
}

.mobile-nav.show {
  display: flex;
}

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

/* ===== Hero Banner ===== */
.hero {
  padding: 48px 0;
  position: relative;
}

.banner-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  display: flex;
  align-items: center;
  gap: 32px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 0.6s ease;
}

.banner-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: var(--accent-gradient);
  border-radius: 50%;
  opacity: 0.1;
  filter: blur(60px);
  animation: float 6s ease-in-out infinite;
}

.banner-card::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -20%;
  width: 300px;
  height: 300px;
  background: var(--accent-color);
  border-radius: 50%;
  opacity: 0.05;
  filter: blur(80px);
  animation: float 8s ease-in-out infinite reverse;
}

.banner-text {
  flex: 1;
  position: relative;
  z-index: 1;
}

.banner-text h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -1px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.banner-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-cta {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.btn {
  background: var(--accent-gradient);
  color: var(--button-text);
  border: none;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.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: var(--transition);
}

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

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
  box-shadow: none;
}

.btn-outline:hover {
  background: var(--accent-color);
  color: var(--button-text);
  box-shadow: var(--shadow-md);
}

.svg-placeholder {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-weight: 600;
  min-width: 200px;
  height: 140px;
  position: relative;
  z-index: 1;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.svg-placeholder:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ===== Section Titles ===== */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-heading);
  margin: 48px 0 24px;
  border-left: 6px solid var(--accent-color);
  padding-left: 20px;
  position: relative;
  letter-spacing: -0.5px;
  animation: fadeInUp 0.6s ease;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 20px;
  width: 60px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

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

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

.card h3 {
  color: var(--text-heading);
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 700;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card .link {
  color: var(--accent-color);
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  margin-top: 16px;
  position: relative;
  transition: var(--transition);
}

.card .link:hover {
  color: var(--accent-hover);
  padding-left: 8px;
}

/* ===== Article List ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-item {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-gradient);
  transform: scaleY(0);
  transform-origin: top;
  transition: var(--transition);
}

.article-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.article-item:hover::before {
  transform: scaleY(1);
}

.article-item h4 {
  color: var(--text-heading);
  font-size: 1.15rem;
  margin-bottom: 8px;
  font-weight: 600;
  transition: var(--transition);
}

.article-item:hover h4 {
  color: var(--accent-color);
}

.article-item .meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-item p {
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.article-item a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-item a:hover {
  gap: 8px;
  color: var(--accent-hover);
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  overflow: hidden;
}

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

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  color: var(--accent-color);
  background: var(--bg-secondary);
}

.faq-question span {
  font-size: 1.5rem;
  font-weight: 300;
  transition: var(--transition);
  display: inline-block;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.faq-item.open .faq-question span {
  transform: rotate(45deg);
  background: var(--accent-color);
  color: var(--button-text);
  border-color: var(--accent-color);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-primary);
  border-top: 1px solid var(--border-color);
  display: none;
  line-height: 1.8;
  animation: fadeIn 0.3s ease;
}

.faq-item.open .faq-answer {
  display: block;
  padding-top: 16px;
}

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

/* ===== HowTo ===== */
.howto-steps {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.howto-steps:hover {
  box-shadow: var(--shadow-lg);
}

.howto-steps h3 {
  color: var(--text-heading);
  margin-bottom: 16px;
  font-weight: 700;
}

.howto-steps ol {
  padding-left: 24px;
  color: var(--text-primary);
  counter-reset: step;
}

.howto-steps ol li {
  margin-bottom: 12px;
  position: relative;
  padding-left: 8px;
  transition: var(--transition);
}

.howto-steps ol li:hover {
  color: var(--accent-color);
  transform: translateX(4px);
}

.howto-steps ul {
  color: var(--text-primary);
  margin-left: 24px;
  list-style-type: disc;
}

.howto-steps ul li {
  margin-bottom: 8px;
  padding-left: 4px;
}

.howto-steps p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.howto-steps strong {
  color: var(--accent-color);
}

/* ===== Info Table ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
}

.info-table th, .info-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.info-table th {
  background: var(--bg-secondary);
  color: var(--text-heading);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-table td {
  color: var(--text-primary);
}

.info-table tr:hover td {
  background: var(--bg-secondary);
}

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

/* ===== Contact Section ===== */
#contact .container > div {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

#contact .container > div:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

#contact h4 {
  color: var(--text-heading);
  margin-bottom: 16px;
  font-weight: 700;
}

#contact p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 4px;
}

#contact a {
  color: var(--accent-color);
  display: block;
  margin-bottom: 8px;
  transition: var(--transition);
  position: relative;
  padding-left: 0;
}

#contact a:hover {
  color: var(--accent-hover);
  padding-left: 8px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer);
  color: var(--text-footer);
  padding: 48px 0 24px;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.footer-grid h4 {
  color: #ffffff;
  margin-bottom: 16px;
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-grid p {
  color: var(--text-footer);
  line-height: 1.8;
  margin-bottom: 8px;
}

.footer-grid a {
  color: var(--text-footer);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  transition: var(--transition);
  position: relative;
  padding-left: 0;
}

.footer-grid a:hover {
  color: #ffffff;
  padding-left: 8px;
}

.copyright {
  border-top: 1px solid #334155;
  margin-top: 32px;
  padding-top: 24px;
  text-align: center;
  color: #94a3b8;
  font-size: 0.9rem;
}

/* ===== Back to Top ===== */
#backTop {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: var(--accent-gradient);
  color: var(--button-text);
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  z-index: 999;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

#backTop.show {
  opacity: 1;
  transform: translateY(0);
}

#backTop:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* ===== Utility Classes ===== */
.text-secondary {
  color: var(--text-secondary);
}

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

/* ===== Scroll Animation ===== */
@keyframes scrollReveal {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-reveal {
  animation: scrollReveal 0.6s ease both;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .banner-card {
    padding: 40px 32px;
  }
  
  .banner-text h1 {
    font-size: 2.5rem;
  }
  
  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .mobile-nav.show {
    display: flex;
  }
  
  .banner-card {
    flex-direction: column;
    text-align: center;
    padding: 32px 24px;
  }
  
  .banner-text h1 {
    font-size: 2rem;
  }
  
  .banner-text p {
    font-size: 1rem;
  }
  
  .banner-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .search-box {
    max-width: 140px;
  }
  
  .search-box input {
    width: 80px;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .svg-placeholder {
    min-width: 100%;
    height: 120px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-grid a {
    display: inline-block;
    margin: 4px 8px;
  }
  
  #backTop {
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .banner-text h1 {
    font-size: 1.75rem;
  }
  
  .banner-card {
    padding: 24px 20px;
  }
  
  .nav-wrap {
    height: 64px;
  }
  
  .logo a {
    font-size: 1.4rem;
  }
  
  .search-box {
    display: none;
  }
  
  .section-title {
    font-size: 1.3rem;
    padding-left: 16px;
  }
  
  .howto-steps {
    padding: 20px;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== Print Styles ===== */
@media print {
  .site-header,
  .site-footer,
  #backTop,
  .search-box,
  .dark-toggle,
  .menu-toggle {
    display: none !important;
  }
  
  body {
    background: #ffffff;
    color: #000000;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
  
  .card,
  .article-item,
  .faq-item,
  .howto-steps {
    break-inside: avoid;
    border: 1px solid #ddd;
    box-shadow: none;
  }
}
```