* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: #172033;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid #e4e8f0;
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 2;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  overflow: hidden;
  display: block;
  border: 1px solid #e3e8f0;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(23, 32, 51, 0.14);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-text strong {
  color: #172033;
  font-size: 18px;
  line-height: 1;
  font-weight: 900;
}

.brand-text small {
  color: #667287;
  font-size: 12px;
  line-height: 1.2;
  font-weight: 700;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: #526078;
  font-size: 14px;
}

.hero {
  display: grid;
  align-items: end;
  min-height: 42vh;
  padding: 72px clamp(20px, 7vw, 96px) 42px;
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.74)),
    url("https://images.unsplash.com/photo-1497366754035-f200968a6e72?auto=format&fit=crop&w=1800&q=80") center/cover;
}

.eyebrow {
  margin: 0 0 12px;
  color: #0b7f78;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  max-width: 680px;
  margin: 18px 0 0;
  color: #4f5e75;
  font-size: 18px;
  line-height: 1.8;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 28px clamp(20px, 7vw, 96px) 72px;
}

.demo-card {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 12px;
  padding: 28px;
  border: 1px solid #e1e6ee;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 18px 48px rgba(28, 42, 68, 0.08);
}

.demo-card span {
  color: #0b7f78;
  font-size: 13px;
  font-weight: 800;
}

.demo-card h2 {
  margin: 0;
  font-size: 26px;
}

.demo-card p {
  margin: 0;
  color: #627087;
  line-height: 1.7;
}

.demo-card a {
  width: fit-content;
  margin-top: 8px;
  padding: 10px 16px;
  color: #ffffff;
  font-weight: 700;
  border-radius: 6px;
  background: #172033;
}

@media (max-width: 900px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }
}