* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: #2b2140;
  background: linear-gradient(160deg, rgba(222, 205, 255, 0.88), rgba(255, 255, 255, 0.92));
  min-height: 100vh;
  position: relative;
}

.page-bg {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(160deg, rgba(233, 223, 255, 0.78), rgba(255, 255, 255, 0.8)), url("https://images.unsplash.com/photo-1492144534655-ae79c964c9d7?auto=format&fit=crop&w=2000&q=80");
  background-size: cover;
  background-position: center;
  z-index: -1;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.62);
  border-bottom: 1px solid rgba(150, 121, 210, 0.25);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #37235d;
  font-weight: 700;
  font-size: 1.05rem;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(164, 130, 227, 0.5);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 16px;
}

.nav a {
  text-decoration: none;
  color: #4a3575;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 8px;
  border-radius: 999px;
  transition: background 0.25s ease;
}

.nav a:hover {
  background: rgba(191, 163, 245, 0.22);
}

main {
  width: min(1120px, 92%);
  margin: 24px auto 48px;
  display: grid;
  gap: 42px;
}

.banner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 28px;
  padding: 30px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.64);
  border: 1px solid rgba(164, 130, 227, 0.28);
  box-shadow: 0 14px 36px rgba(124, 95, 178, 0.18);
}

.tag {
  display: inline-block;
  margin: 0 0 12px;
  font-weight: 700;
  color: #6648a5;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.15;
}

.banner-text p {
  margin: 14px 0 0;
  font-size: 1.03rem;
  line-height: 1.7;
  color: #4b3f66;
}

.banner-image-wrap {
  display: flex;
  justify-content: center;
}

.phone-image {
  width: min(100%, 280px);
  aspect-ratio: 9 / 20;
  object-fit: cover;
  border-radius: 28px;
  border: 4px solid rgba(255, 255, 255, 0.82);
  box-shadow: 0 18px 34px rgba(88, 56, 145, 0.24);
}

.intro-features,
.screenshot {
  padding: 28px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.67);
  border: 1px solid rgba(164, 130, 227, 0.24);
  box-shadow: 0 12px 30px rgba(116, 87, 167, 0.16);
}

h2 {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
}

.section-subtitle {
  margin: 8px 0 0;
  color: #594c73;
  line-height: 1.65;
}

.feature-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 16px;
  align-items: center;
  padding: 16px;
  border-radius: 20px;
  background: linear-gradient(160deg, rgba(244, 237, 255, 0.92), rgba(255, 255, 255, 0.95));
  border: 1px solid rgba(171, 136, 237, 0.26);
}

.card-media {
  display: flex;
  justify-content: center;
}

.card-content h3 {
  margin: 0;
  font-size: 1.08rem;
  color: #3e276b;
}

.card-content p {
  margin: 10px 0 0;
  color: #5c4d7b;
  line-height: 1.68;
  font-size: 0.95rem;
}

.screenshot-frame {
  margin-top: 22px;
  display: flex;
  justify-content: center;
}

.screenshot-frame img {
  width: min(100%, 860px);
  border-radius: 22px;
  border: 4px solid rgba(255, 255, 255, 0.82);
  box-shadow: 0 16px 34px rgba(101, 73, 152, 0.2);
}

.footer {
  padding: 26px 20px 34px;
  text-align: center;
  background: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(157, 122, 224, 0.3);
}

.footer-nav {
  justify-content: center;
  margin-bottom: 12px;
}

.footer p {
  margin: 8px 0;
  color: #4c3a72;
}

.footer a {
  color: #5f44a1;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

@media (max-width: 980px) {
  .banner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .banner-image-wrap {
    order: -1;
  }

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

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    justify-content: flex-start;
  }

  main {
    width: 94%;
    gap: 26px;
    margin: 16px auto 34px;
  }

  .banner,
  .intro-features,
  .screenshot {
    padding: 18px;
    border-radius: 18px;
  }

  .feature-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .phone-image {
    width: min(100%, 230px);
  }
}