```css
:root {
  --bg-primary: #F8FAFC;
  --bg-secondary: #FFFFFF;
  --bg-header: rgba(255, 255, 255, 0.85);
  --bg-footer: #1F2937;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-code: #F1F5F9;
  --text-primary: #17202A;
  --text-secondary: #243447;
  --text-title: #0F172A;
  --text-heading: #1E293B;
  --text-footer: #E2E8F0;
  --text-footer-secondary: #CBD5E1;
  --text-link: #1D4ED8;
  --text-btn: #FFFFFF;
  --text-card-title: #0F172A;
  --text-card-body: #1F2937;
  --border-color: rgba(203, 213, 225, 0.6);
  --accent: #2563EB;
  --accent-dark: #1E40AF;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-blur: 12px;
  --gradient-banner: linear-gradient(135deg, #1E293B 0%, #4C1D95 50%, #2563EB 100%);
  --radius-card: 16px;
  --radius-btn: 30px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-header: rgba(17, 24, 39, 0.85);
  --bg-footer: #0B1120;
  --bg-card: rgba(30, 41, 59, 0.8);
  --bg-code: #1E293B;
  --text-primary: #E2E8F0;
  --text-secondary: #CBD5E1;
  --text-title: #F8FAFC;
  --text-heading: #F1F5F9;
  --text-footer: #E2E8F0;
  --text-footer-secondary: #94A3B8;
  --text-link: #93C5FD;
  --text-btn: #FFFFFF;
  --text-card-title: #F8FAFC;
  --text-card-body: #E2E8F0;
  --border-color: rgba(51, 65, 85, 0.7);
  --accent: #3B82F6;
  --accent-dark: #2563EB;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.4);
  --gradient-banner: linear-gradient(135deg, #0F172A 0%, #1E3A5F 50%, #1E293B 100%);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--text-title);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 2.2rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.8rem;
  margin-top: 2rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.3rem;
  margin-top: 1.5rem;
  color: var(--text-heading);
}

h4 {
  font-size: 1.1rem;
  color: var(--text-heading);
}

p {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.navbar {
  background-color: var(--bg-header);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-sm);
  padding: 0.8rem 0;
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-title);
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent), #F59E0B);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  transition: color 0.2s;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--accent);
  text-decoration: none;
}

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

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--text-btn);
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-btn);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease;
}

.btn:hover {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.card {
  background-color: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  box-shadow: var(--shadow-glass);
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.card:hover::before {
  opacity: 1;
}

.card-title {
  color: var(--text-card-title);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  transition: color 0.3s ease;
}

.card-text {
  color: var(--text-card-body);
}

.hero {
  background: var(--gradient-banner);
  padding: 4rem 0;
  margin-top: 0;
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

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

.hero h1, .hero p {
  color: #F8FAFC;
  position: relative;
  z-index: 1;
}

.hero .btn {
  background-color: #F59E0B;
  color: #111827;
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.hero .btn:hover {
  background-color: #D97706;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

th, td {
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  text-align: left;
  color: var(--text-primary);
}

th {
  background-color: var(--bg-code);
  font-weight: 600;
  color: var(--text-title);
}

.breadcrumb {
  background-color: var(--bg-secondary);
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--text-link);
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  transition: background-color 0.3s ease;
}

.faq-item:hover {
  background-color: rgba(37, 99, 235, 0.05);
}

.faq-question {
  font-weight: 600;
  color: var(--text-title);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.2s ease;
}

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

.faq-question span {
  display: inline-block;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  margin-top: 0.5rem;
  color: var(--text-primary);
}

.footer {
  background-color: var(--bg-footer);
  color: var(--text-footer);
  padding: 2.5rem 0 1rem;
  margin-top: 3rem;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #F59E0B, var(--accent));
}

.footer a {
  color: var(--text-footer-secondary);
  transition: color 0.2s ease;
}

.footer a:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.footer p, .footer li {
  color: var(--text-footer);
}

.text-secondary {
  color: var(--text-secondary);
}

.bg-white {
  background-color: var(--bg-secondary);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.mt-4 {
  margin-top: 2rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 0.3rem 0.8rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.4rem 0.6rem;
  color: var(--text-primary);
  outline: none;
  width: 160px;
  transition: width 0.3s ease;
}

.search-box input:focus {
  width: 200px;
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-title);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 0.3rem 1rem;
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.05);
}

@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  .nav-links {
    gap: 1rem;
    width: 100%;
    justify-content: center;
  }
  h1 {
    font-size: 1.8rem;
  }
  .search-box input {
    width: 120px;
  }
  .search-box input:focus {
    width: 150px;
  }
  .navbar .container {
    flex-direction: column;
    gap: 0.8rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.card {
  animation: fadeInUp 0.6s ease both;
}

.card:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3) {
  animation-delay: 0.2s;
}

.card:nth-child(4) {
  animation-delay: 0.3s;
}

.card:nth-child(5) {
  animation-delay: 0.4s;
}

.card:nth-child(6) {
  animation-delay: 0.5s;
}

.card:nth-child(7) {
  animation-delay: 0.6s;
}

.card:nth-child(8) {
  animation-delay: 0.7s;
}

.card:nth-child(9) {
  animation-delay: 0.8s;
}

.card:nth-child(10) {
  animation-delay: 0.9s;
}

article.card {
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

article.card:hover {
  transform: translateX(8px);
  border-left: 3px solid var(--accent);
}

article.card .card-title {
  transition: color 0.3s ease;
}

article.card:hover .card-title {
  color: var(--accent);
}

.footer .grid-3 {
  gap: 2rem;
}

.footer h4 {
  color: #F8FAFC;
  margin-bottom: 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

.footer p {
  margin-bottom: 0.5rem;
}

hr {
  border-color: #334155;
  margin: 1.5rem 0;
  opacity: 0.6;
}

a[href="#"] {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--accent);
  color: white;
  padding: 10px 14px;
  border-radius: 50%;
  font-weight: bold;
  text-decoration: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  z-index: 100;
}

a[href="#"]:hover {
  background: var(--accent-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

section {
  scroll-margin-top: 80px;
}

#howto ol {
  margin-left: 1.5rem;
  color: var(--text-primary);
}

#howto ol li {
  margin-bottom: 0.5rem;
  position: relative;
}

#howto ol li::marker {
  color: var(--accent);
  font-weight: bold;
}

#contact .grid-2 p {
  margin-bottom: 0.8rem;
}

#contact strong {
  color: var(--text-title);
}

::selection {
  background: var(--accent);
  color: white;
}

::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
}

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