/* ==========================================================================
   TAG ACCELERATOR - Pure Native CSS Stylesheet (Business Minimalist Style)
   Design: Sleek Business Minimalist & Dark Cyber Tech Edition
   Optimized for ultra-fast loading, mobile priority & dynamic CSS keyframes
   ========================================================================== */

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111726;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(26, 36, 56, 0.9);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(56, 189, 248, 0.4);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-accent: #38bdf8;
  
  --primary-cyan: #00f2fe;
  --primary-blue: #3b82f6;
  --primary-purple: #8b5cf6;
  
  --gradient-primary: linear-gradient(135deg, #00f2fe 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);
  --gradient-text: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #38bdf8 100%);
  
  --glow-primary: 0 0 25px rgba(0, 242, 254, 0.3);
  --glow-purple: 0 0 25px rgba(139, 92, 246, 0.3);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --container-max: 1240px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.1) 0%, rgba(0, 242, 254, 0.04) 35%, var(--bg-primary) 75%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography Utilities */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-accent {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--text-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: var(--text-main);
}

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

/* Buttons & CTA */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #050811;
  box-shadow: var(--glow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.55);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

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

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 1.1rem 2.5rem;
  font-size: 1.125rem;
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.85rem;
  font-weight: 900;
  letter-spacing: -0.5px;
}

.brand-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #050811;
  box-shadow: var(--glow-primary);
}

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

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

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Hero Section (Split 2-Column Layout with Dynamic Elements) */
.hero {
  padding: 160px 0 90px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--text-accent);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.75rem;
  animation: pulse-glow 3s infinite alternate;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 10px rgba(59, 130, 246, 0.2); }
  100% { box-shadow: 0 0 22px rgba(0, 242, 254, 0.35); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-title .brand-name-tag {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  padding-right: 4px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.stat-box h4 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-cyan);
}

.stat-box p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Hero Right: Dynamic Elements & Dashboard Card */
.hero-visual {
  position: relative;
}

.visual-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
}

.visual-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.08) 0%, transparent 60%);
  pointer-events: none;
  animation: rotate-bg 15s linear infinite;
}

@keyframes rotate-bg {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.status-dot-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #10b981;
}

.status-dot {
  width: 10px;
  height: 10px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: blink 1.8s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.speed-meter {
  font-size: 0.85rem;
  color: var(--text-accent);
  font-weight: 700;
  background: rgba(56, 189, 248, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

/* Dynamic Floating Node Items */
.nodes-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.node-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.node-item:nth-child(1) {
  animation: float-item 4s ease-in-out infinite alternate;
}
.node-item:nth-child(2) {
  animation: float-item 4s ease-in-out 1.3s infinite alternate;
}
.node-item:nth-child(3) {
  animation: float-item 4s ease-in-out 2.6s infinite alternate;
}

@keyframes float-item {
  0% { transform: translateY(0px); border-color: rgba(255, 255, 255, 0.05); }
  100% { transform: translateY(-6px); border-color: rgba(0, 242, 254, 0.3); background: rgba(30, 41, 64, 0.7); }
}

.node-flag-info {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.node-icon-bg {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  font-weight: 800;
  font-size: 0.85rem;
}

.node-details h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-details p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-metrics {
  text-align: right;
}

.ping-tag {
  color: #10b981;
  font-size: 0.85rem;
  font-weight: 700;
}

.bandwidth-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Floating Feature Badges around Dashboard */
.floating-badge {
  position: absolute;
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid rgba(0, 242, 254, 0.3);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  backdrop-filter: blur(12px);
  z-index: 2;
}

.badge-top-right {
  top: -18px;
  right: -10px;
  animation: float-badge 5s ease-in-out infinite alternate;
}

.badge-bottom-left {
  bottom: -18px;
  left: -10px;
  animation: float-badge 5s ease-in-out 2.5s infinite alternate;
}

@keyframes float-badge {
  0% { transform: translateY(0); }
  100% { transform: translateY(-10px); }
}

/* Core Advantages Section */
.advantages {
  padding: 100px 0;
}

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition);
}

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

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

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.6;
}

/* Streaming & AI Support Section */
.support-section {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(17, 23, 38, 0.6) 50%, transparent 100%);
}

.category-group {
  margin-bottom: 3rem;
}

.category-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.category-title svg {
  color: var(--primary-cyan);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.support-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(26, 36, 56, 0.95);
}

.support-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.support-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.support-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Pricing Section (Real Accelerator Plans) */
.pricing {
  padding: 100px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(22, 30, 46, 0.98) 0%, rgba(59, 130, 246, 0.15) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: var(--glow-primary);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: #050811;
  padding: 0.25rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 1.25rem;
  text-align: center;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.plan-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  min-height: 40px;
}

.plan-price {
  margin: 1.25rem 0 1.75rem 0;
  text-align: center;
}

.price-currency {
  font-size: 1.35rem;
  font-weight: 700;
  vertical-align: super;
  color: var(--primary-cyan);
}

.price-amount {
  font-size: 2.85rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  color: var(--text-muted);
  font-size: 0.85rem;
}

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

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
  color: var(--text-main);
  font-size: 0.875rem;
}

.feature-item svg {
  color: var(--primary-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   SEO Articles Section (Placed directly below Pricing)
   ========================================================================== */
.articles-section {
  padding: 80px 0 100px 0;
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.4) 0%, transparent 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.article-card-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.2);
  color: var(--primary-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  transition: var(--transition);
}

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

.article-card-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-read-link {
  color: var(--text-accent);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
}

.article-card:hover .article-read-link {
  color: var(--primary-cyan);
  transform: translateX(3px);
}

/* Detailed Article Page Layout */
.article-layout {
  padding: 150px 0 100px 0;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3.5rem 3rem;
  box-shadow: var(--shadow-card);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-tag-label {
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary-cyan);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.8rem;
}

.article-main-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 2rem;
  color: var(--text-main);
}

.article-body-content {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-cyan);
  margin: 2.5rem 0 1.25rem 0;
  padding-left: 0.75rem;
  border-left: 4px solid var(--primary-cyan);
}

.article-body-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 1.75rem 0 1rem 0;
}

.article-body-content p {
  margin-bottom: 1.25rem;
}

.article-body-content ul, .article-body-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

.article-body-content li {
  margin-bottom: 0.5rem;
}

.article-body-content a.internal-link {
  color: var(--primary-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-body-content a.internal-link:hover {
  color: var(--text-accent);
}

.article-cta-box {
  margin: 3rem 0 1rem 0;
  padding: 2.5rem;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-md);
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.975rem;
}

/* User Reviews */
.reviews {
  padding: 100px 0;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.review-stars {
  color: #f59e0b;
  display: flex;
  gap: 0.25rem;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: auto;
}

.user-avatar {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #050811;
  font-weight: 800;
  font-size: 1.05rem;
}

.user-info h5 {
  font-size: 0.95rem;
  font-weight: 700;
}

.user-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* FAQ Section */
.faq {
  padding: 100px 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--bg-card-hover);
}

.faq-summary {
  padding: 1.5rem 2rem;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
  color: var(--primary-cyan);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 2rem 1.5rem 2rem;
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.5rem;
  padding-top: 1rem;
}

/* Strictly Compliant Footer */
.site-footer {
  margin-top: auto;
  background: #06090e;
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.footer-link {
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 600;
  transition: var(--transition);
  padding: 0.5rem;
}

.footer-link:hover {
  color: var(--primary-cyan);
}

.footer-bottom {
  text-align: center;
  color: rgba(148, 163, 184, 0.5);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1.5rem;
}

/* Sub-page Specific Styles */
.page-header {
  padding: 160px 0 60px 0;
  text-align: center;
}

.page-title {
  font-size: 2.75rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.page-content {
  padding: 40px 0 100px 0;
}

.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.content-box h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-cyan);
  margin: 2rem 0 1rem 0;
}

.content-box h2:first-child {
  margin-top: 0;
}

.content-box p {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.8;
  font-size: 1rem;
}

.content-box ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

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

/* Sitemap List */
.sitemap-grid {
  display grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  color: var(--text-main);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sitemap-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sitemap-card li {
  margin-bottom: 0.75rem;
}

.sitemap-card a {
  color: var(--text-accent);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.sitemap-card a:hover {
  color: var(--primary-cyan);
  text-decoration: underline;
}

/* Responsive Layout Breakpoints */
@media (max-width: 1100px) {
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-content { text-align: center; }
  .hero-title { font-size: 2.85rem; }
  .hero-actions { justify-content: center; }
  .hero-stats-row { justify-content: center; }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-card.popular { transform: none; }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 130px 0 60px 0; }
  .hero-title { font-size: 2.25rem; }
  .hero-subtitle { font-size: 1.05rem; }
  .hero-stats-row { flex-direction: column; gap: 1.25rem; }
  
  .advantages-grid, .pricing-grid, .reviews-grid, .articles-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: repeat(2, 1fr); }
  .sitemap-grid { grid-template-columns: 1fr; }
  
  .section-title { font-size: 1.75rem; }
  .content-box { padding: 2rem 1.5rem; }
  .article-container { padding: 2rem 1.5rem; }
  .article-main-title { font-size: 1.75rem; }
  .footer-nav { flex-direction: column; gap: 1.25rem; }
  .floating-badge { display: none; }
}

@media (max-width: 480px) {
  .support-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
}