.demo-page {
  background: #FFFDF8;
  color: #334155;
}
/* Hero */
.demo-hero {
  background: linear-gradient(135deg, #111827 0%, #2D1B69 100%);
  padding: 90px 20px;
  text-align: center;
  color: #fff;
}
.demo-hero .hero-content {
  max-width: 820px;
  margin: auto;
}
.demo-hero .hero-badge {
  display: inline-block;
  background: #FFD54A;
  color: #111827;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 700;
  margin-bottom: 24px;
}
.demo-hero h1 {
  color: #FFD54A;
  font-size: 48px;
  margin-bottom: 20px;
}
.demo-hero .hero-desc {
  font-size: 20px;
  line-height: 1.9;
  color: #F8FAFC;
}
/* 快速入口 */
.demo-nav {
  max-width: 1200px;
  margin: -40px auto 70px;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.nav-card {
  background: #fff;
  border-radius: 22px;
  padding: 28px 20px;
  text-align: center;
  text-decoration: none;
  color: #111827;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
  transition: 0.25s;
}
.nav-card:hover {
  transform: translateY(-6px);
}
.nav-card span {
  font-size: 42px;
  display: block;
  margin-bottom: 12px;
}
.nav-card strong {
  display: block;
  font-size: 18px;
  margin-bottom: 6px;
}
.nav-card small {
  color: #64748B;
}
.nav-card.yellow {
  border-top: 6px solid #FFD54A;
}
.nav-card.green {
  border-top: 6px solid #16A34A;
}
.nav-card.purple {
  border-top: 6px solid #5B21B6;
}
/* Section */
.demo-section {
  max-width: 1200px;
  margin: auto;
  padding: 80px 20px;
}
.demo-section.dark {
  background: #111827;
  border-radius: 36px;
  color: #fff;
  margin-bottom: 70px;
}
.demo-section.dark .section-header h2 {
  color: #FFD54A;
}
.demo-section.dark .section-header p {
  color: #E2E8F0;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header .section-icon {
  font-size: 36px;
}
.section-header .section-subtitle {
  display: block;
  color: #CA8A04;
  font-weight: 700;
  margin: 12px 0;
  letter-spacing: 1px;
}
.section-header h2 {
  font-size: 38px;
  margin-bottom: 14px;
  color: #111827;
}
.section-header p {
  font-size: 18px;
  color: #64748B;
  max-width: 760px;
  margin: auto;
  line-height: 1.8;
}
/* Video */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.video-card {
  background: #fff;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
}
.video-card h3 {
  font-size: 20px;
  padding: 22px 22px 10px;
  color: #111827;
}
.video-card p {
  padding: 0 22px 24px;
  color: #64748B;
  line-height: 1.8;
}
.video-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
}
.video-box iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
/* CTA */
.demo-footer {
  padding: 90px 20px;
}
.demo-footer .footer-card {
  max-width: 900px;
  margin: auto;
  background: linear-gradient(135deg, #111827, #312E81);
  color: #fff;
  border-radius: 36px;
  padding: 50px 40px;
  text-align: center;
  font-size: 18px;
}
.demo-footer h2 {
  color: #FFD54A;
  font-size: 36px;
  margin-bottom: 20px;
}
.demo-footer p {
  color: #E2E8F0;
  font-size: 18px;
  margin-bottom: 32px;
}
.footer-buttons {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}
/* 共用按鈕 */
.btn-yellow,
.btn-dark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: 0.25s;
}
.btn-yellow {
  background: #FFD54A;
  color: #111827;
}
.btn-dark {
  background: #1F2937;
  color: #fff;
}
.btn-yellow:hover,
.btn-dark:hover {
  transform: translateY(-3px);
}
/* Mobile */
@media (max-width: 750px) {
  .demo-hero {
    padding: 70px 20px;
  }
  .demo-hero h1 {
    font-size: 34px;
  }
  .demo-hero .hero-desc {
    font-size: 17px;
  }
  .demo-nav {
    grid-template-columns: 1fr;
    margin-top: -30px;
  }
  .video-grid {
    grid-template-columns: 1fr;
  }
  .section-header h2 {
    font-size: 30px;
  }
  .section-header p {
    font-size: 16px;
  }
  .demo-footer .footer-card {
    padding: 36px 24px;
  }
  .demo-footer h2 {
    font-size: 28px;
  }
}