/* ==========================================================================
   飞鸟云机场 (Feiniaoyun Airport) - 官方网站核心样式表
   Design Language: Distinct Nordic Ice Slate & Electric Sapphire Palette, Bento Grid, Modern Chinese Typography
   ========================================================================== */

/* 1. CSS Custom Properties / Design Tokens */
:root {
  /* Distinct Brand & Layout Palette (Fresh Nordic Ice & Sapphire Blue) */
  --bg-main: #F0F4F8;            /* Fresh Crisp Ice Slate / Mist White */
  --bg-card: #FFFFFF;            /* Pure White Card */
  --bg-card-green: #E0F2FE;      /* Card 01 - Refreshing Ice Sky Blue (AI & Work) */
  --bg-card-pink: #EDE9FE;       /* Card 02 - Elegant Lavender Iris (Global Media) */
  --bg-card-sand: #E2E8F0;       /* Card 03 - Cool Nordic Slate (Multi-Device) */
  --bg-card-light: #F8FAFC;      /* Subtle Cool Light Card */
  
  --text-main: #0F172A;          /* Deep Slate Black */
  --text-sub: #475569;           /* Slate Grey */
  --text-muted: #94A3B8;         /* Light Muted Slate */
  
  --text-green: #0369A1;         /* Deep Sky Blue for Card 01 */
  --text-pink: #5B21B6;          /* Deep Iris Violet for Card 02 */
  --text-sand: #334155;          /* Dark Slate for Card 03 */

  --primary-accent: #0F172A;     /* Deep Slate Pill CTA */
  --primary-accent-hover: #2563EB; /* Vibrant Royal Sapphire Blue */
  --brand-orange: #0284C7;       /* Flying Bird Electric Sapphire Blue */
  
  --border-light: rgba(148, 163, 184, 0.15);
  --border-medium: rgba(148, 163, 184, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  
  --shadow-sm: 0 4px 14px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.1);

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

/* 2. Global Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 880px;
}

/* Section Header Styles */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(2, 132, 199, 0.08);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-orange);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-sub);
  max-width: 680px;
  margin: 0 auto;
}

/* Button Component */
.btn-primary {
  background: var(--primary-accent);
  color: #FFFFFF;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary:hover {
  background: var(--primary-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #FFFFFF;
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-main);
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(15, 23, 42, 0.1);
  transform: translateY(-2px);
}

/* Header & Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(240, 244, 248, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  padding: 16px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0284C7, #2563EB);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
}

.nav-links a:hover {
  color: var(--brand-orange);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--text-main);
}

/* Hero Section */
.hero {
  padding: 64px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--brand-orange);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--brand-orange);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(2, 132, 199, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title span {
  background: linear-gradient(135deg, #0284C7, #2563EB);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-sub);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-features-strip {
  display: flex;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.feature-pill-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-sub);
}

.feature-pill-item svg {
  width: 18px;
  height: 18px;
  color: var(--brand-orange);
}

/* Hero Visual Box / Simulated Interactive Tool */
.hero-visual-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.latency-sim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.latency-sim-title {
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-list-preview {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--bg-main);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.node-item:hover {
  border-color: var(--border-medium);
  background: #FFF;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.node-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.node-protocol {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--brand-orange);
  font-weight: 600;
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #0284C7;
  font-family: var(--font-mono);
}

.ping-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #0284C7;
}

/* ==========================================================================
   3. Bento Grid Section (Distinct Cool Ice & Iris Theme)
   ========================================================================== */
.bento-section {
  padding: 60px 0;
}

.bento-grid-top {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.bento-grid-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.bento-grid-sub-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.bento-card {
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
  min-height: 280px;
}

.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* Bento Card 01 - Refreshing Ice Sky Blue (AI & Remote Work) */
.bento-card-green {
  background-color: var(--bg-card-green);
  color: var(--text-green);
}

/* Bento Card 02 - Elegant Iris Violet (Global Media & 4K Streaming) */
.bento-card-pink {
  background-color: var(--bg-card-pink);
  color: var(--text-pink);
}

/* Bento Card 03 - Cool Nordic Slate (Multi-Device) */
.bento-card-sand {
  background-color: var(--bg-card-sand);
  color: var(--text-sand);
}

/* Bento Card 04 - Device Grid Box */
.bento-card-devices {
  background-color: #FFFFFF;
  color: var(--text-main);
  padding: 0;
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  border: 1px solid var(--border-light);
}

.bento-card-number {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  opacity: 0.75;
  margin-bottom: 16px;
}

.bento-card-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.bento-card-desc {
  font-size: 1rem;
  line-height: 1.65;
  opacity: 0.88;
  margin-bottom: 24px;
  max-width: 460px;
}

.bento-pills-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: auto;
}

.bento-pill {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(0, 0, 0, 0.04);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  color: inherit;
}

/* Background Watermark Graphics */
.bird-watermark {
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 220px;
  height: 220px;
  opacity: 0.08;
  pointer-events: none;
}

/* Devices Sub-grid inside Bento */
.device-text-side {
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.device-icons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  background: var(--bg-main);
  border-left: 1px solid var(--border-medium);
}

.device-icon-box {
  padding: 32px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-right: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  transition: background 0.25s ease;
}

.device-icon-box:hover {
  background: rgba(255, 255, 255, 0.8);
}

.device-icon-box svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
  opacity: 0.8;
}

.device-icon-box span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
}

.device-icon-box.bird-box {
  background: var(--bg-card-green);
  color: var(--brand-orange);
}

/* ==========================================================================
   4. Pricing Plans Section
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  background: rgba(240, 244, 248, 0.5);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.plan-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.plan-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-medium);
}

.plan-card.popular {
  border: 2px solid var(--brand-orange);
  box-shadow: var(--shadow-md);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand-orange);
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 20px;
  min-height: 40px;
}

.plan-price-box {
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

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

.plan-features-list {
  list-style: none;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-features-list li {
  font-size: 0.9rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features-list li svg {
  width: 16px;
  height: 16px;
  color: #0284C7;
  flex-shrink: 0;
}

.plan-btn {
  margin-top: auto;
  width: 100%;
  text-align: center;
  justify-content: center;
}

/* ==========================================================================
   5. Target Audience & Features Carousel/Grid
   ========================================================================== */
.audience-section {
  padding: 80px 0;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.audience-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease;
}

.audience-card:hover {
  transform: translateY(-4px);
}

.audience-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.audience-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.audience-desc {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* Client Setup Cards */
.clients-section {
  padding: 80px 0;
  background: #FFF;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.25s ease;
}

.client-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-3px);
}

.client-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.client-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: var(--shadow-sm);
}

.client-name {
  font-weight: 700;
  font-size: 1.05rem;
}

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

.client-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
}

.client-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand-orange);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   6. Testimonials Section
   ========================================================================== */
.testimonials-section {
  padding: 80px 0;
  background: var(--bg-main);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 20px;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar-initial {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card-green);
  color: var(--text-green);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

/* ==========================================================================
   7. FAQ Accordion Section
   ========================================================================== */
.faq-section {
  padding: 80px 0;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.faq-item.active {
  border-color: var(--brand-orange);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: left;
}

.faq-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  background: rgba(240, 244, 248, 0.4);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding: 0 28px 24px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ==========================================================================
   8. Articles Directory / Blog Cards Section
   ========================================================================== */
.articles-section {
  padding: 80px 0;
  background: var(--bg-card-light);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.article-tag {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--brand-orange);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.read-more-link {
  font-weight: 600;
  color: var(--brand-orange);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   9. Article Detail Page Layout (SEO Article Styling)
   ========================================================================== */
.article-header {
  padding: 60px 0 32px;
  background: #FFF;
  border-bottom: 1px solid var(--border-light);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}

.breadcrumbs a:hover {
  color: var(--brand-orange);
}

.article-main-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-body-wrapper {
  padding: 60px 0;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
}

.article-content {
  background: #FFF;
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  font-size: 1.05rem;
  line-height: 1.8;
  color: #1E293B;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--bg-main);
  color: var(--text-main);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-main);
}

.article-content p {
  margin-bottom: 20px;
}

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

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

.article-content blockquote {
  background: var(--bg-card-green);
  border-left: 4px solid var(--brand-orange);
  padding: 16px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-green);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-medium);
  text-align: left;
  font-size: 0.95rem;
}

.article-content th {
  background: var(--bg-main);
  font-weight: 700;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.sidebar-widget {
  background: #FFF;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border-light);
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

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

.toc-list a {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.4;
}

.toc-list a:hover {
  color: var(--brand-orange);
}

.cta-widget {
  background: linear-gradient(135deg, #E0F2FE, #EDE9FE);
  border-radius: var(--radius-md);
  padding: 24px;
  color: var(--text-main);
  text-align: center;
}

.cta-widget h4 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.cta-widget p {
  font-size: 0.88rem;
  margin-bottom: 18px;
  opacity: 0.9;
}

/* ==========================================================================
   10. Footer Section (Deep Slate Black Footer)
   ========================================================================== */
.footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.4rem;
  color: #FFF;
}

.footer-desc {
  font-size: 0.9rem;
  color: #94A3B8;
  line-height: 1.65;
  max-width: 340px;
}

.footer-title {
  color: #FFF;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 20px;
}

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

.footer-links a {
  font-size: 0.9rem;
  color: #94A3B8;
}

.footer-links a:hover {
  color: #FFF;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

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

.footer-legal-links a {
  color: #64748B;
}

.footer-legal-links a:hover {
  color: #FFF;
}

/* Keywords Footer Tag Cloud */
.keywords-cloud {
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.kw-tag {
  font-size: 0.78rem;
  color: #94A3B8;
  background: rgba(255, 255, 255, 0.05);
  padding: 3px 10px;
  border-radius: 4px;
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brand-orange);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  background: #2563EB;
}

/* ==========================================================================
   11. Responsive Media Queries
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .bento-grid-top {
    grid-template-columns: 1fr;
  }

  .bento-card-devices {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

  .device-icons-grid {
    border-left: none;
    border-top: 1px solid var(--border-medium);
  }

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

  .audience-grid, .testimonials-grid, .articles-grid, .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-body-wrapper {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .mobile-nav-active .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #F0F4F8;
    padding: 24px;
    border-bottom: 1px solid var(--border-medium);
    box-shadow: var(--shadow-md);
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .bento-card-title {
    font-size: 1.6rem;
  }

  .pricing-grid, .audience-grid, .testimonials-grid, .articles-grid, .clients-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}