:root {
  --primary: #0EA5E9;
  --secondary: #14B8A6;
  --accent: #F59E0B;
  --bg-dark: #0C4A6E;
  --bg-light: #F0F9FF;
  --bg-card: rgba(255, 255, 255, 0.92);
  --text-main: #1E293B;
  --text-muted: #64748B;
}

* {
  box-sizing: border-box;
}

html, body {
  overflow-x: hidden;
}

body {
  font-family: 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-main);
  background-color: var(--bg-light);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
}

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

.cloud-float {
  animation: cloudFloat 5s ease-in-out infinite;
}

.cloud-float-delay {
  animation: cloudFloat 6s ease-in-out infinite 1s;
}

@keyframes cloudFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.glow-pulse {
  animation: glowPulse 2.5s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.35); }
  50% { box-shadow: 0 0 18px 6px rgba(245, 158, 11, 0.2); }
}

.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease-out, transform 0.55s ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.btn-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-radius: 9999px;
  padding: 0.875rem 2rem;
  font-weight: 600;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.25);
}

.btn-gradient:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px rgba(14, 165, 233, 0.38);
}

.btn-capsule {
  background: #fff;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 9999px;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  transition: all 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-capsule:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(14, 165, 233, 0.25);
}

.card-glass {
  background: var(--bg-card);
  border: 1px solid rgba(14, 165, 233, 0.14);
  border-radius: 1rem;
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-glass:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(14, 165, 233, 0.14);
}

.card-solid {
  background: #fff;
  border-radius: 1rem;
  border: 1px solid #E2E8F0;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.card-solid:hover {
  transform: scale(1.02);
  border-color: var(--primary);
}

.heading-line::after {
  content: '';
  display: block;
  width: 3rem;
  height: 0.25rem;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 9999px;
  margin-top: 0.75rem;
}

.heading-icon::before {
  content: '';
  display: inline-block;
  width: 0.45rem;
  height: 1.4rem;
  background: linear-gradient(180deg, var(--accent), var(--primary));
  border-radius: 9999px;
  margin-right: 0.5rem;
  vertical-align: middle;
}

.nav-link {
  position: relative;
  color: var(--text-main);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
}

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

.footer-link {
  color: rgba(255, 255, 255, 0.75);
  transition: color 0.2s ease;
}

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

.mobile-menu {
  display: none;
}

.mobile-menu.open {
  display: flex;
}

@media (min-width: 768px) {
  .mobile-menu {
    display: flex !important;
  }
  .hamburger {
    display: none;
  }
}