:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --secondary: #0f172a;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --success: #10b981;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --nav-height: 70px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  width: 100%;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -999px;
  left: 1rem;
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus {
  top: 1rem;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--primary-hover);
}

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
}
.brand-logo svg {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
  flex-shrink: 0;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}
.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-main);
  padding: 0.5rem 0.25rem;
}
.nav-menu a:hover {
  color: var(--primary);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 1.25rem;
  background-color: var(--primary);
  color: #fff !important;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, transform 0.1s ease;
}
.nav-cta:hover {
  background-color: var(--primary-hover);
}

/* Section Common */
section {
  padding: 4.5rem 0;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem;
}
.section-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 9999px;
  margin-bottom: 0.75rem;
}
.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Hero Section (3D Dynamic Visuals & Background Waves) */
.hero-section {
  position: relative;
  overflow: hidden;
  padding: 4.5rem 0 4rem;
  background: linear-gradient(180deg, #ffffff 0%, #f7faff 35%, #ebf4fe 80%, #f3f8fd 100%);
  width: 100%;
}
.hero-bg-effects {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}
.hero-ambient-glow {
  position: absolute;
  top: 8%;
  right: -4%;
  width: 660px;
  height: 660px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(186, 230, 253, 0.6) 0%, rgba(224, 242, 254, 0.35) 45%, rgba(248, 250, 252, 0) 72%);
  filter: blur(45px);
}
.hero-wave-svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 290px;
  pointer-events: none;
}
.hero-container {
  display: grid;
  grid-template-columns: 55fr 45fr;
  align-items: center;
  gap: 2.25rem;
  position: relative;
  z-index: 2;
  width: 100%;
}
.hero-content {
  min-width: 0;
  width: 100%;
  text-align: left;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #fff;
  border: 1px solid #bfdbfe;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}
.hero-title {
  font-size: clamp(1.9rem, 2.7vw, 2.55rem);
  font-weight: 800;
  color: var(--secondary);
  letter-spacing: -0.02em;
  line-height: 1.28;
  margin-bottom: 1.25rem;
  word-break: break-word;
}
.hero-title .highlight {
  color: var(--primary);
  background: linear-gradient(135deg, #1d4ed8, #2563eb, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 580px;
}
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff !important;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.45);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.75rem;
  background-color: #fff;
  color: var(--secondary) !important;
  font-size: 1.05rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}
.btn-secondary:hover {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
}
.hero-highlights {
  display: flex;
  justify-content: flex-start;
  gap: 1.75rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
}
.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
}
.highlight-item svg {
  color: var(--success);
  width: 18px;
  height: 18px;
}

/* 3D Globe Visual Container */
.hero-visual {
  position: relative;
  min-width: 0;
  width: 100%;
  height: 480px;
  max-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.globe-canvas-wrap {
  width: 100%;
  height: 100%;
  position: relative;
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}
.globe-canvas-wrap canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  outline: none;
  filter: drop-shadow(0 15px 30px rgba(37, 99, 235, 0.12));
  position: relative;
  z-index: 2;
}

/* Ground Pedestal Light Flare & Reflection */
.globe-ground-glow {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 380px;
  height: 60px;
  pointer-events: none;
  z-index: 1;
}
.ground-glow-diffuse {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 44px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(56, 189, 248, 0.55) 0%, rgba(96, 165, 250, 0.25) 45%, rgba(37, 99, 235, 0) 75%);
  filter: blur(14px);
}
.ground-glow-beam {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 340px;
  height: 2.5px;
  border-radius: 9999px;
  background: linear-gradient(90deg, transparent 0%, rgba(147, 197, 253, 0.3) 15%, rgba(255, 255, 255, 0.95) 50%, rgba(147, 197, 253, 0.3) 85%, transparent 100%);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.85), 0 0 32px rgba(96, 165, 250, 0.5);
}

/* WebGL Fallback Graphic */
.globe-fallback {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 320px;
  height: 320px;
}
.fallback-globe-circle {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #93c5fd 0%, #3b82f6 55%, #1e40af 100%);
  box-shadow: 0 0 50px rgba(59, 130, 246, 0.4), inset -20px -20px 40px rgba(15, 23, 42, 0.6);
  position: relative;
}
.fallback-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 2px solid rgba(96, 165, 250, 0.5);
  transform: translate(-50%, -50%);
}
.fallback-ring-1 {
  width: 135%;
  height: 70%;
  transform: translate(-50%, -50%) rotate(-25deg);
}
.fallback-ring-2 {
  width: 155%;
  height: 55%;
  transform: translate(-50%, -50%) rotate(35deg);
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
}
.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 0.75rem;
}
.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1rem;
}
.feature-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}
.feature-tag {
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: #f1f5f9;
  color: #475569;
}

/* Streaming & AI Section */
.streaming-section {
  background-color: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.streaming-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.capability-card {
  background-color: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
}
.capability-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.capability-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: #fef3c7;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.capability-icon.ai {
  background-color: #e0e7ff;
  color: #4f46e5;
}
.capability-icon svg {
  width: 24px;
  height: 24px;
}
.capability-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--secondary);
}
.capability-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}
.service-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: #fff;
  border: 1px solid var(--border);
  padding: 0.45rem 0.9rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}
.pill-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
}

/* Pricing Table */
.pricing-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  align-items: stretch;
}
.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease;
}
.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}
.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.9rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.pricing-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 0.5rem;
}
.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.75rem;
}
.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--secondary);
}
.price-amount {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1;
}
.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--text-main);
  padding: 0.5rem 0;
  border-bottom: 1px dashed #f1f5f9;
}
.pricing-features li svg {
  color: var(--success);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.pricing-card .btn-primary, .pricing-card .btn-secondary {
  width: 100%;
}

/* Reviews Section */
.reviews-section {
  background-color: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.review-card {
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}
.review-rating {
  display: flex;
  gap: 0.2rem;
  color: #f59e0b;
  margin-bottom: 0.75rem;
}
.review-rating svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}
.review-content {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #475569;
}
.author-info h4 {
  font-size: 0.95rem;
  color: var(--secondary);
}
.author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* FAQ Section (Default Open details/summary) */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
details.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
details.faq-item[open] {
  border-color: #bfdbfe;
}
details.faq-item summary {
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--secondary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
details.faq-item summary::-webkit-details-marker {
  display: none;
}
details.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  line-height: 1;
  color: var(--primary);
  font-weight: 400;
  margin-left: 1rem;
  transition: transform 0.2s ease;
}
details.faq-item[open] summary::after {
  content: "−";
}
.faq-answer {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  border-top: 1px solid #f8fafc;
}
.faq-answer a {
  font-weight: 600;
  text-decoration: underline;
}

/* Footer Section */
.site-footer {
  background-color: var(--secondary);
  color: #94a3b8;
  padding: 2.5rem 0 2rem;
  border-top: none;
  position: relative;
}

/* ==========================================================================
   Footer Transition (自然柔和蓝雾渐变过渡)
   ========================================================================== */
.footer-transition {
  width: 100%;
  height: 90px;
  background: linear-gradient(180deg, transparent 0%, rgba(11, 19, 41, 0.4) 45%, var(--secondary) 100%);
  position: relative;
  pointer-events: none;
  overflow: hidden;
  margin-top: 2rem;
}

/* 微弱柔和淡蓝色雾化光晕，无任何线条与硬分界 */
.footer-transition::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 55px;
  background: radial-gradient(ellipse 60% 50% at 50% 100%, rgba(56, 189, 248, 0.12) 0%, rgba(37, 99, 235, 0.05) 50%, transparent 80%);
  filter: blur(18px);
  pointer-events: none;
}

@media (max-width: 768px) {
  .footer-transition {
    height: 60px;
    margin-top: 1rem;
  }
}
.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  text-align: center;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.footer-brand svg {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  flex-shrink: 0;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  list-style: none;
  flex-wrap: wrap;
}
.footer-links a {
  color: #cbd5e1;
  font-size: 0.95rem;
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
}
.footer-links a:hover {
  color: #60a5fa;
}
.footer-copy {
  font-size: 0.85rem;
  color: #64748b;
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  width: 100%;
}

/* Subpage / Article Common Layout */
.article-header {
  padding: 3.5rem 0 2rem;
  background: linear-gradient(180deg, #f0f7ff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--border);
}
.article-breadcrumbs {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.article-breadcrumbs a {
  color: var(--text-muted);
}
.article-breadcrumbs a:hover {
  color: var(--primary);
}
.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.article-container {
  max-width: 840px;
  margin: 3rem auto;
  padding: 0 1.25rem;
}
.article-content {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-main);
}
.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #f1f5f9;
}
.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--secondary);
  margin: 1.5rem 0 0.75rem;
}
.article-content p {
  margin-bottom: 1.25rem;
}
.article-content ul, .article-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}
.article-content li {
  margin-bottom: 0.4rem;
}
.article-content blockquote {
  background: #f8fafc;
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  color: #475569;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.article-cta-box {
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: center;
  margin: 2.5rem 0;
}
.article-cta-box h3 {
  color: #1e3a8a;
  margin: 0 0 0.5rem;
}
.article-cta-box p {
  color: #3b82f6;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

/* Knowledge Hub Grid */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.article-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.card-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  align-self: flex-start;
  margin-bottom: 0.75rem;
}
.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}
.card-title a {
  color: inherit;
}
.card-title a:hover {
  color: var(--primary);
}
.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #94a3b8;
  border-top: 1px solid #f1f5f9;
  padding-top: 0.75rem;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 52fr 48fr;
    gap: 1.75rem;
  }
  .hero-visual {
    height: 420px;
  }
  .features-grid, .pricing-container, .reviews-grid, .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
}

@media (max-width: 860px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    text-align: center;
  }
  .hero-content {
    order: 1;
    max-width: 100%;
    text-align: center;
    margin: 0 auto;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-highlights {
    justify-content: center;
    gap: 1.25rem;
  }
  .hero-visual {
    order: 2;
    height: 330px;
    max-width: 360px;
    margin: 0 auto;
    width: 100%;
  }
  .hero-wave-svg {
    height: 200px;
  }
  .globe-ground-glow {
    width: 300px;
    height: 50px;
    bottom: 8px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }
  .nav-menu {
    gap: 0.75rem;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .features-grid, .streaming-grid, .pricing-container, .reviews-grid, .knowledge-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .article-content {
    padding: 1.5rem;
  }
  .footer-links {
    gap: 1rem;
    flex-direction: column;
  }
  .hero-highlights {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
    line-height: 1.3;
  }
  .hero-visual {
    height: 270px;
    max-width: 300px;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}