:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #121218;
  --bg-tertiary: #1a1a24;
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --info: #3b82f6;
  --info-bg: rgba(59, 130, 246, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(180deg, #05060a, #080b14);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* Header */
.header {
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: opacity 0.3s;
}

.logo:hover {
  opacity: 0.8;
}

.logo-img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.header-nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-link:hover {
  color: var(--text-primary);
}

/* Hero */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: radial-gradient(ellipse 1000px 400px at 50% 0%, rgba(99, 102, 241, 0.2), transparent);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, #e5e7eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.hero-desc {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-weight: 500;
}

/* Search Box */
.search-box {
  max-width: 680px;
  margin: 0 auto 32px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  color: var(--accent-primary);
  pointer-events: none;
  z-index: 2;
}

.search-input {
  width: 100%;
  padding: 20px 24px 20px 60px;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(99, 102, 241, 0.2);
  border-radius: 16px;
  color: var(--text-primary);
  font-size: 17px;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), 0 8px 30px rgba(99, 102, 241, 0.2);
  background: rgba(255, 255, 255, 0.1);
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
  font-weight: 400;
}

/* Quick Links */
.quick-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.quick-links-label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.quick-link {
  padding: 8px 16px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 8px;
  color: #a5b4fc;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.quick-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.quick-link:hover::before {
  left: 100%;
}

.quick-link:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
  font-size: 14px;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s;
}

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

.breadcrumb svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

.breadcrumb span {
  color: var(--text-primary);
  font-weight: 600;
}

/* Layout */
.main {
  padding: 40px 0 80px;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.sidebar-section {
  margin-bottom: 32px;
}

.sidebar-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s;
}

.sidebar-link svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke-width: 2;
  transition: all 0.3s;
}

.sidebar-link:hover svg {
  transform: translateX(2px);
}

.sidebar-link.active svg {
  stroke: var(--accent-primary);
}

.sidebar-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
}

/* Contact Card */
.contact-card {
  padding: 24px;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 12px;
  text-align: center;
}

.contact-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 102, 241, 0.2);
  border-radius: 50%;
  color: var(--accent-primary);
}

.contact-icon svg {
  width: 24px;
  height: 24px;
}

.contact-card h4 {
  font-size: 16px;
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--accent-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s;
}

.contact-btn:hover {
  background: var(--accent-secondary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

.contact-btn svg {
  width: 18px;
  height: 18px;
}

/* Articles */
.articles {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.article-category {
  scroll-margin-top: 100px;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 36px;
  color: var(--text-primary);
  padding-bottom: 16px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
  position: relative;
}

.category-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), transparent);
}

.category-title svg {
  width: 36px;
  height: 36px;
  color: var(--accent-primary);
  stroke-width: 2;
  filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.3));
}

.articles-grid {
  display: grid;
  gap: 24px;
}

/* Article Card */
.article-card {
  padding: 32px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.article-card:hover {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.03));
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15), 0 0 0 1px rgba(99, 102, 241, 0.1);
}

.article-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 12px;
  font-size: 24px;
  margin-bottom: 20px;
  transition: all 0.3s;
}

.article-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--accent-primary);
  stroke-width: 2;
}

.article-card:hover .article-icon {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(139, 92, 246, 0.3));
}

.article-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color 0.3s;
}

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

.article-excerpt {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
  align-items: center;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-meta svg {
  stroke: var(--accent-primary);
  opacity: 0.7;
}

.article-date::before,
.article-views::before {
  content: none !important;
}

/* Article Content (Hidden by default) */
.article-content {
  display: none;
  margin-top: 28px;
  padding-top: 28px;
  border-top: 2px solid rgba(99, 102, 241, 0.2);
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

.article-card.expanded .article-content {
  display: block;
  animation: slideDown 0.4s ease-out;
}

.article-card.expanded {
  background: linear-gradient(145deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.05));
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 16px 50px rgba(99, 102, 241, 0.2), 0 0 0 1px rgba(99, 102, 241, 0.2);
}

.article-card.expanded::before {
  transform: scaleX(1);
}

@keyframes slideDown {
  from { 
    opacity: 0; 
    transform: translateY(-20px);
    max-height: 0;
  }
  to { 
    opacity: 1; 
    transform: translateY(0);
    max-height: 3000px;
  }
}

.article-content h4 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.article-content h4:first-child {
  margin-top: 0;
}

.article-content p {
  margin-bottom: 16px;
  line-height: 1.8;
}

.article-content ul,
.article-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.8;
}

.article-content code {
  padding: 2px 6px;
  background: rgba(99, 102, 241, 0.15);
  border-radius: 4px;
  color: var(--accent-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
}

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

/* Device Grid */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.device-category {
  padding: 20px;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 12px;
  transition: all 0.3s;
}

.device-category:hover {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.device-category > strong {
  display: block;
  font-size: 16px;
  color: var(--accent-primary);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

.device-category ul {
  margin: 0;
  padding-left: 20px;
}

.device-category li {
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.6;
}

/* Alerts */
.alert {
  padding: 16px 20px;
  border-radius: 8px;
  margin: 20px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  line-height: 1.6;
}

.alert strong {
  font-weight: 600;
}

.alert-info {
  background: var(--info-bg);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #93c5fd;
}

.alert-info strong {
  color: #60a5fa;
}

.alert-success {
  background: var(--success-bg);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

.alert-success strong {
  color: #34d399;
}

.alert-warning {
  background: var(--warning-bg);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fcd34d;
}

.alert-warning strong {
  color: #fbbf24;
}

/* Pricing Table */
.pricing-table {
  margin: 20px 0;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
}

.pricing-row {
  display: flex;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-row:last-child {
  border-bottom: none;
}

.pricing-row:hover {
  background: rgba(255, 255, 255, 0.02);
}

.pricing-amount {
  font-weight: 600;
  color: var(--text-primary);
}

.pricing-price {
  font-weight: 700;
  color: var(--accent-primary);
}

/* Payment Methods */
.payment-methods {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 20px 0;
}

.payment-method {
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
}

.payment-method strong {
  display: block;
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.payment-method p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.footer-logo span {
  font-size: 18px;
  font-weight: 700;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
  }
  
  .sidebar-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 36px;
  }
  
  .hero-desc {
    font-size: 16px;
  }
  
  .header-nav {
    display: none;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .sidebar-nav {
    grid-template-columns: 1fr;
  }
  
  .quick-links {
    flex-direction: column;
  }
}

/* Hidden Class */
.hidden {
  display: none !important;
}