/* === base === */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
}

/* === hero === */
.hero {
  min-height: 100svh;
  position: relative;
  display: grid;
  place-items: center;
  padding: 24px;
  isolation: isolate;
  background:
    radial-gradient(1200px 800px at 50% 20%, rgba(0,0,0,.25), rgba(0,0,0,.55)),
    #000 center/cover no-repeat;
  background-position: center center;
  background-size: cover;

  /* 既定＝PC横長用 */
  background-image: url("ready_pc.jpg");
}

/* 画面が縦長（スマホ想定）なら1080x1920に切替 */
@media (max-aspect-ratio: 3/4) {
  .hero {
    background-image: url("ready_sp.jpg"); /* ＝1080x1920 */
    background-position: center top;
  }
}

/* === text block === */
.hero__inner {
  text-align: center;
  padding: 24px 20px;
  border-radius: 16px;
  backdrop-filter: blur(4px);
  background: rgba(0,0,0,.25);
  max-width: min(92vw, 800px);
}
.hero__title {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: .04em;
  font-weight: 800;
}
.hero__subtitle {
  margin: 0 0 20px;
  font-size: clamp(14px, 2.6vw, 18px);
  line-height: 1.6;
  opacity: .95;
}
.hero__btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.5);
  color: #fff; text-decoration: none; font-weight: 700;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease;
  background: rgba(255,255,255,.08);
}
.hero__btn:hover { transform: translateY(-1px); background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.75); }

/* === footer === */
.hero__footer {
  position: absolute;
  inset: auto 16px 12px auto;
  opacity: .85;
  font-size: 12px;
}

/* === spacing tweak on wide === */
@media (min-width: 992px) {
  .hero__inner { padding: 32px 28px; }
}