:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "PingFang HK", "Microsoft JhengHei", sans-serif;
  background: #eef7f8;
  color: #16343c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(155deg, #e9f8f7 0%, #eff3fb 55%, #fbeef5 100%);
}

main {
  width: min(100%, 1160px);
  margin: 0 auto;
  padding: 28px 16px 42px;
}

h1, p { margin-top: 0; }

.heading { text-align: center; }
.heading h1 { margin-bottom: 8px; font-size: clamp(1.5rem, 5vw, 2.4rem); }
.heading p { color: #4c6870; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr));
  gap: 22px;
}

.card, .poster-shell {
  overflow: hidden;
  border: 1px solid rgba(27, 90, 101, .12);
  border-radius: 18px;
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 16px 45px rgba(48, 82, 95, .14);
}

.card img, .poster-shell img {
  display: block;
  width: 100%;
  height: auto;
}

.card-content { padding: 16px 18px 19px; }
.card h2 { margin: 0 0 12px; font-size: 1.15rem; }

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 10px 18px;
  background: #176b7c;
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.poster-page { width: min(100%, 840px); }
.poster-page .heading { margin-bottom: 16px; }
.poster-page .button { margin-top: 15px; }

@media (max-width: 520px) {
  main { padding: 14px 10px 28px; }
  .poster-shell, .card { border-radius: 12px; }
}