/* ===================================================================
   隐云 (YinYun.buzz) - 官方极速网络加速落地页样式系统
   纯原生高能 CSS3 | 零依赖秒级加载 | 移动端深度适配 | 同排套餐网格
   =================================================================== */

:root {
  --bg-primary: #070b14;
  --bg-secondary: #0b1120;
  --bg-card: rgba(15, 23, 42, 0.72);
  --bg-card-hover: rgba(22, 33, 58, 0.88);
  --bg-card-featured: linear-gradient(165deg, rgba(20, 35, 68, 0.9), rgba(12, 20, 42, 0.95));
  --bg-glass: rgba(11, 17, 32, 0.75);

  --primary: #00f2fe;
  --primary-glow: rgba(0, 242, 254, 0.4);
  --secondary: #4facfe;
  --accent-purple: #a855f7;
  --accent-purple-glow: rgba(168, 85, 247, 0.35);
  --accent-green: #10b981;
  --accent-orange: #f59e0b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.35);
  --border-purple: rgba(168, 85, 247, 0.4);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-highlight: #38bdf8;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  --container-max: 1240px;
  --container-narrow: 920px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.6);
  --shadow-hover: 0 20px 45px -8px rgba(0, 242, 254, 0.25);
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  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;
  position: relative;
  min-height: 100vh;
}

/* Background Dynamic Canvas & Cloud Ambiance */
.bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  display: block;
}

/* Ambient Floating Cloud Glows (云朵流光氛围) */
.cloud-ambient-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -2;
  overflow: hidden;
}

.cloud-mist {
  position: absolute;
  border-radius: 50%;
  filter: blur(85px);
  opacity: 0.32;
  pointer-events: none;
  animation: driftCloud 20s ease-in-out infinite alternate;
}

.cloud-mist-1 {
  width: 680px;
  height: 390px;
  top: -8%;
  left: 10%;
  background: radial-gradient(ellipse at center, rgba(0, 242, 254, 0.45) 0%, rgba(56, 189, 248, 0.18) 50%, transparent 75%);
  animation-duration: 22s;
}

.cloud-mist-2 {
  width: 760px;
  height: 440px;
  top: 35%;
  right: -10%;
  background: radial-gradient(ellipse at center, rgba(168, 85, 247, 0.4) 0%, rgba(129, 140, 248, 0.15) 50%, transparent 75%);
  animation-duration: 26s;
  animation-delay: -5s;
}

.cloud-mist-3 {
  width: 580px;
  height: 340px;
  bottom: 5%;
  left: -5%;
  background: radial-gradient(ellipse at center, rgba(0, 242, 254, 0.38) 0%, rgba(14, 165, 233, 0.12) 50%, transparent 75%);
  animation-duration: 20s;
  animation-delay: -10s;
}

@keyframes driftCloud {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(45px, 28px) scale(1.1);
  }
  100% {
    transform: translate(-35px, 18px) scale(0.94);
  }
}

/* Containers */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===================================================================
   Navigation Bar
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
  transition: var(--transition);
}

.brand-logo:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 16px var(--primary-glow);
}

.brand-text {
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 40%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(0, 242, 254, 0.12);
  color: var(--primary);
  border: 1px solid rgba(0, 242, 254, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  -webkit-text-fill-color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: #fff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent-purple));
  transition: width 0.25s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 69px;
  left: 0;
  width: 100%;
  background: rgba(7, 11, 20, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 24px;
  flex-direction: column;
  gap: 18px;
  z-index: 999;
}

.mobile-nav-drawer.active {
  display: flex;
}

.mobile-nav-drawer .nav-link {
  font-size: 1.1rem;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===================================================================
   Buttons
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  color: #040812;
  box-shadow: 0 4px 18px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 242, 254, 0.5);
  filter: brightness(1.08);
}

.btn-purple {
  background: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--accent-purple-glow);
}

.btn-purple:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(168, 85, 247, 0.5);
  filter: brightness(1.1);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-1px);
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* ===================================================================
   Hero Section
   =================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 60px;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
}

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

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

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 780px;
  margin: 0 auto 36px;
  color: var(--text-muted);
  font-size: 1.12rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.badge-item svg {
  color: var(--accent-green);
}

/* ===================================================================
   Live Network Telemetry Panel
   =================================================================== */
.telemetry-card {
  max-width: 900px;
  margin: 0 auto 70px;
  background: rgba(13, 20, 36, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  box-shadow: var(--shadow-card);
}

.telemetry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.telemetry-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-badge {
  color: var(--accent-green);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
}

.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.telemetry-node {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: left;
}

.node-region {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

.node-loss {
  font-size: 0.76rem;
  color: var(--accent-green);
}

/* ===================================================================
   Section Universal Styles
   =================================================================== */
.section {
  padding: 70px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-desc {
  max-width: 650px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ===================================================================
   Core Features (3 Columns)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.feature-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-card:nth-child(2) .feature-icon-wrap {
  background: rgba(168, 85, 247, 0.1);
  border-color: rgba(168, 85, 247, 0.25);
  color: var(--accent-purple);
}

.feature-title {
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ===================================================================
   PRICING SECTION: 所有价格同排 (Same Row on Desktop)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.pricing-card.featured {
  background: var(--bg-card-featured);
  border: 1.5px solid var(--primary);
  box-shadow: 0 12px 40px -10px var(--primary-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-4px);
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  color: #040812;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.plan-header {
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-sub {
  font-size: 0.88rem;
  color: var(--text-dim);
  min-height: 40px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.plan-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.plan-amount {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: #fff;
  font-family: var(--font-mono);
}

.plan-cycle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.plan-feature-item svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-card.featured .plan-feature-item svg {
  color: var(--primary);
}

.plan-btn {
  width: 100%;
  margin-top: auto;
  padding: 12px;
}

/* ===================================================================
   Articles Section (3 Columns)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  text-decoration: none;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.article-card-tag {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 12px;
  transition: var(--transition);
}

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

.article-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.article-card-link {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===================================================================
   User Reviews & Testimonials
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(168, 85, 247, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.review-user-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: #fff;
}

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

.review-stars {
  color: #facc15;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===================================================================
   FAQ Accordion
   =================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.faq-item.active {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-icon {
  font-size: 1.3rem;
  color: var(--primary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 22px;
}

/* ===================================================================
   CTA Banner
   =================================================================== */
.cta-section {
  padding: 80px 0 100px;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(16, 27, 56, 0.85) 0%, rgba(26, 17, 48, 0.85) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  text-align: center;
  box-shadow: 0 20px 60px -15px var(--primary-glow);
}

.cta-banner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 14px;
  color: #fff;
}

.cta-banner p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 30px;
}

/* ===================================================================
   Footer
   =================================================================== */
.footer {
  background: #04070e;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

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

.footer-brand p {
  color: var(--text-muted);
  margin-top: 12px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ===================================================================
   Article Details Page Styles
   =================================================================== */
.article-page .article-main {
  padding: 40px 0 80px;
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

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

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

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-tag {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.article-section {
  margin-bottom: 36px;
}

.article-section h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #e2e8f0;
  margin: 22px 0 10px;
}

.article-section p {
  color: #cbd5e1;
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-section ul, .article-section ol {
  color: #cbd5e1;
  font-size: 1rem;
  line-height: 1.8;
  margin-left: 24px;
  margin-bottom: 18px;
}

.article-section li {
  margin-bottom: 8px;
}

.inline-link {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: var(--transition);
}

.inline-link:hover {
  color: #7dd3fc;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(16, 24, 48, 0.9) 0%, rgba(24, 16, 48, 0.9) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.cta-inner h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

.cta-inner p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.cta-btns {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.article-related {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
}

.article-related h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

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

.related-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  display: inline-block;
  transition: var(--transition);
}

.related-list a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.table-responsive {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.tech-table th, .tech-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.tech-table th {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
  font-weight: 600;
}

.tech-table td {
  color: var(--text-muted);
}

/* ===================================================================
   RESPONSIVE DESIGN & MOBILE ADAPTATION
   =================================================================== */
@media (max-width: 991px) {
  .nav-links, .nav-actions .btn {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .container, .container-narrow {
    padding: 0 16px;
  }
  .hero-section {
    padding: 50px 0 40px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-desc {
    font-size: 0.95rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .telemetry-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .plan-amount {
    font-size: 2.5rem;
  }
}