/* FlyingBird - Landing Page Stylesheet */
:root {
  --primary: #1e6091;
  --primary-hover: #1a537f;
  --accent: #22d3ee;
  --accent-glow: rgba(34, 211, 238, 0.25);
  --btn-blue: #2563eb;
  --btn-blue-hover: #1d4ed8;
  --text-dark: #0f172a;
  --text-muted: #475569;
  --bg-light: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 10px 25px -5px rgba(37, 99, 235, 0.1), 0 8px 10px -6px rgba(37, 99, 235, 0.05);
  --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  background-color: var(--bg-light);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  position: relative;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 5%;
  transition: var(--transition);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 700;
  font-size: 1.4rem;
  cursor: pointer;
  user-select: none;
}

.logo-img {
  width: 32px;
  height: auto;
  display: block;
  transition: var(--transition);
}

.logo:hover .logo-img {
  transform: scale(1.1) rotate(-5deg);
}

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

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--btn-blue);
}

.nav-cta {
  background: var(--btn-blue);
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--btn-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

/* Side Scroll Navigator */
.side-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.side-nav-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--btn-blue);
  font-size: 1.2rem;
  transition: var(--transition);
  outline: none;
}

.side-nav-btn:hover {
  background: var(--btn-blue);
  color: #ffffff;
  border-color: var(--btn-blue);
  transform: scale(1.12);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.side-nav-btn:active {
  transform: scale(0.95);
}

/* Sections Common */
section {
  padding: 5rem 5%;
  max-width: 1280px;
  margin: 0 auto;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-dark);
  letter-spacing: -0.5px;
  margin-bottom: 0.8rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* Hero Section */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding-top: 4rem;
  padding-bottom: 5rem;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-dark);
  margin-bottom: 1.2rem;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn-primary {
  background: var(--btn-blue);
  color: #ffffff;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--btn-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.btn-recommend {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #ffffff;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(2, 132, 199, 0.45);
}

.btn-secondary {
  background: #ffffff;
  color: var(--btn-blue);
  border: 1px solid #bfdbfe;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: #eff6ff;
  border-color: var(--btn-blue);
  transform: translateY(-2px);
}

/* Hero Dynamic Illustration */
.hero-visual {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
}

.hero-card-box {
  width: 100%;
  max-width: 520px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.hero-card-box::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.2) 0%, rgba(255, 255, 255, 0) 70%);
  border-radius: 50%;
}

.ping-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.ping-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.speed-meter {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.speed-num {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-dark);
  letter-spacing: -1px;
}

.speed-unit {
  font-size: 1.1rem;
  color: var(--btn-blue);
  font-weight: 700;
}

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

.node-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

.node-name {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-latency {
  color: #10b981;
  font-weight: 600;
  font-family: monospace;
}

/* Core Advantages Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.2rem 1.8rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #eff6ff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--btn-blue);
  margin-bottom: 1.4rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--text-dark);
}

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

/* Streaming & AI Cards */
.media-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.media-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.media-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.media-badge-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: #f1f5f9;
}

.media-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

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

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.pricing-card.popular {
  border: 2px solid var(--btn-blue);
  box-shadow: var(--shadow-md);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--btn-blue);
  color: #ffffff;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.pricing-plan {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--btn-blue);
  margin-bottom: 0.3rem;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.8rem;
}

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

.pricing-features li {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li svg {
  color: #10b981;
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
  text-align: center;
  background: var(--bg-light);
  color: var(--text-dark);
  border: 1px solid var(--border);
  padding: 0.85rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-weight: 700;
  transition: var(--transition);
  display: block;
}

.pricing-card.popular .pricing-cta,
.pricing-cta:hover {
  background: var(--btn-blue);
  color: #ffffff;
  border-color: var(--btn-blue);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

/* Articles Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.article-tag {
  display: inline-block;
  background: #eff6ff;
  color: var(--btn-blue);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.article-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.article-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.read-btn {
  color: var(--btn-blue);
  background: transparent;
  border: none;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  transition: var(--transition);
}

.read-btn:hover {
  gap: 10px;
}

/* Modal Popup for Articles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

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

.modal-box {
  background: #ffffff;
  width: 100%;
  max-width: 860px;
  max-height: 85vh;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: #f1f5f9;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}

.modal-close:hover {
  background: #e2e8f0;
  color: var(--text-dark);
}

.modal-article-content h2 {
  font-size: 1.8rem;
  margin-top: 1.5rem;
  margin-bottom: 0.8rem;
  color: var(--text-dark);
}

.modal-article-content h3 {
  font-size: 1.3rem;
  margin-top: 1.2rem;
  margin-bottom: 0.6rem;
  color: var(--text-dark);
}

.modal-article-content p {
  font-size: 0.95rem;
  color: #334155;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.modal-cta-box {
  margin: 2rem 0;
  padding: 1.5rem;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  text-align: center;
}

/* FAQ Section */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.faq-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

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

/* Testimonials / Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
  font-style: italic;
  line-height: 1.6;
}

.review-user {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-dark);
}

/* Footer & SEO Link Footprint */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 4rem 5% 2rem;
  border-top: 1px solid #1e293b;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid #1e293b;
}

.footer-link {
  color: #e2e8f0;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  transition: var(--transition);
}

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

.pbn-footer-box {
  text-align: center;
  font-size: 0.9rem;
  color: #64748b;
  line-height: 1.8;
}

.pbn-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.8rem;
}

.pbn-a {
  color: #38bdf8;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.pbn-a:hover {
  color: #7dd3fc;
  text-decoration: underline;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-btns {
    justify-content: center;
  }

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

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

@media (max-width: 768px) {
  .header {
    padding: 0.8rem 1rem;
  }

  .nav-menu {
    display: none;
  }

  .hero-section {
    padding-top: 2rem;
    padding-bottom: 3rem;
  }

  .hero-content h1 {
    font-size: 2.1rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .features-grid,
  .pricing-grid,
  .articles-grid,
  .reviews-grid,
  .media-grid {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1.2rem;
  }

  .side-nav {
    right: 12px;
  }
  
  .side-nav-btn {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }
}