/* ==========================================================================
   肥猫云机场 (Feimaoyun Airport) - 苹果硬件级奢华 UI 设计系统
   Aesthetic: Dark Titanium Luxury, Cinematic Glow, Backdrop Blur Glassmorphism
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-primary: #07080b;
  --bg-secondary: #0d0f15;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(18, 20, 29, 0.7);
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-active: rgba(168, 85, 247, 0.4);
  --border-glow: rgba(236, 72, 153, 0.3);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-purple: #a855f7;
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  
  --gradient-brand: linear-gradient(135deg, #c084fc 0%, #6366f1 50%, #38bdf8 100%);
  --gradient-gold: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  --gradient-dark: linear-gradient(180deg, rgba(15, 23, 42, 0.6) 0%, rgba(7, 8, 11, 0.95) 100%);
  
  --shadow-glow: 0 0 50px -10px rgba(168, 85, 247, 0.25);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --font-main: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  background: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(168, 85, 247, 0.15), transparent 60%),
    radial-gradient(circle at 85% 30%, rgba(99, 102, 241, 0.08), transparent 50%),
    radial-gradient(circle at 15% 70%, rgba(6, 182, 212, 0.06), transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding-top: 8rem;
  padding-bottom: 8rem;
}

@media (max-width: 768px) {
  .section-padding {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }
}

/* Header & Glass Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(7, 8, 11, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-smooth);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #a855f7, #6366f1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.35);
  transition: var(--transition-smooth);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(168, 85, 247, 0.5);
  filter: brightness(1.1);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  position: relative;
  padding-top: 11rem;
  padding-bottom: 6rem;
  text-align: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.25);
  color: #c084fc;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 4rem;
}

/* Feature Highlights Grid */
.hero-specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  backdrop-filter: blur(10px);
}

.spec-val {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
}

.spec-lbl {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* Hardware Showcase Card (SVG Mockup) */
.showcase-wrapper {
  margin-top: 4rem;
  position: relative;
}

.hardware-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 2rem;
  backdrop-filter: blur(25px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.mockup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 1.5rem;
}

.window-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.mockup-title {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem;
}

.section-tag {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-purple);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* Advantages Grid */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-smooth);
  backdrop-filter: blur(15px);
  position: relative;
  overflow: hidden;
}

.adv-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
}

.adv-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #c084fc;
  margin-bottom: 1.5rem;
}

.adv-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.adv-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Pricing Section */
.billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.switch-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}

.switch-label.active {
  color: var(--text-main);
}

.discount-badge {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-amber);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
  backdrop-filter: blur(15px);
}

.pricing-card.featured {
  border-color: var(--accent-purple);
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.08) 0%, rgba(13, 15, 21, 0.8) 100%);
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.2);
  transform: scale(1.03);
}

.pricing-popular-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #fff;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pricing-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pricing-subtitle {
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.pricing-price {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.15rem;
  line-height: 1;
}

.pricing-price .price-currency {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-right: 2px;
}

.pricing-price .price-val {
  font-size: 3.5rem;
  font-weight: 900;
  color: #ffffff;
  letter-spacing: -0.03em;
}

.pricing-price .price-period {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 0.2rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.925rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.pricing-features li svg {
  width: 18px;
  height: 18px;
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* Audience Grid */
.audience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  gap: 1.25rem;
  backdrop-filter: blur(15px);
}

.audience-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.audience-info h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.audience-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Tutorial Interactive Tab Component */
.tab-container {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  backdrop-filter: blur(20px);
}

.tab-nav {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  overflow-x: auto;
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-smooth);
}

.tab-btn.active {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(168, 85, 247, 0.3);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

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

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

.step-box {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.step-num {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-purple);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.step-box h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.step-box p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Speed Test Metrics Table */
.speed-table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.speed-table th {
  background: rgba(255, 255, 255, 0.04);
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-light);
}

.speed-table td {
  padding: 1.15rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.95rem;
}

.speed-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.node-name {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
}

.flag-icon {
  font-size: 1.2rem;
}

.ping-good {
  color: var(--accent-emerald);
  font-weight: 700;
  font-family: monospace;
}

.speed-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  width: 120px;
}

.speed-fill {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
}

/* Testimonials Wall */
.testi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  backdrop-filter: blur(15px);
}

.testi-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.testi-name {
  font-weight: 700;
  font-size: 1rem;
}

.testi-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.stars {
  color: var(--accent-amber);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.testi-quote {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(15px);
  transition: var(--transition-smooth);
}

.faq-item.active {
  border-color: var(--border-active);
  background: rgba(255, 255, 255, 0.04);
}

.faq-question {
  width: 100%;
  padding: 1.5rem;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
  color: var(--accent-purple);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 1.5rem;
  transition: max-height 0.35s cubic-bezier(1, 0, 1, 0);
}

/* Article Cards Grid */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  backdrop-filter: blur(15px);
}

.article-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5);
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.article-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-light);
  padding-top: 1rem;
}

.read-more {
  color: var(--accent-purple);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Dedicated Article Page Styles */
.article-page-header {
  padding-top: 10rem;
  padding-bottom: 3rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.breadcrumb a:hover {
  color: var(--accent-purple);
}

.article-body-wrapper {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  align-items: start;
}

.article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 3rem;
  backdrop-filter: blur(20px);
}

.article-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.25;
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 2.5rem 0 1.25rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 1.75rem 0 1rem;
  color: #e2e8f0;
}

.article-content p {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.article-content ul, .article-content ol {
  margin: 0 0 1.5rem 1.5rem;
  color: #cbd5e1;
}

.article-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.15) 0%, rgba(99, 102, 241, 0.15) 100%);
  border: 1px solid var(--accent-purple);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 3rem 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: #fff;
}

.sidebar-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(15px);
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

/* Footer Section */
.footer {
  background: #040507;
  border-top: 1px solid var(--border-light);
  padding-top: 5rem;
  padding-bottom: 3rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  margin-top: 1rem;
  max-width: 320px;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a:hover {
  color: var(--accent-purple);
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Modal Windows */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(15px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-smooth);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-window {
  background: #0d0f17;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  max-width: 700px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-card);
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title { font-size: 3rem; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-specs { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .article-body-wrapper { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .hero-title { font-size: 2.25rem; }
  .hero-subtitle { font-size: 1rem; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero-specs { grid-template-columns: repeat(2, 1fr); }
  .tutorial-step-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; width: 100%; }
  .hero-cta .btn-primary, .hero-cta .btn-secondary { width: 100%; }
}