/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  color: #0e202e;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, Arial, sans-serif;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

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

/* ===== Layout ===== */
.cover {
  min-height: 100vh;
  min-height: calc(var(--vh, 1vh) * 100);
  position: relative;
  overflow: hidden;
}

/* 背景 */
.cover__bg {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.cover__bg__picture,
.cover__bg__img {
  width: 100%;
  height: 100%;
  display: block;
}

.cover__bg__img {
  object-fit: cover;
  object-position: center;
}

/* 白いベール（80%でしっかり白） */
.cover__veil {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
}

/* 中央配置 */
.cover__main {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  text-align: center;
}

.cover__main__inner {
  max-width: 760px;
  width: 100%;
}

/* テキスト */
.cover__kicker {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: rgba(23, 60, 95, 0.7);
}

.cover__title {
  margin: 18px 0 0;
  font-size: 32px;
  line-height: 1.28;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: #12263a;

  /* 日本語の不自然な分割防止 */
  word-break: keep-all;
  overflow-wrap: anywhere;
}

/* リード：大きめ＋太字 */
.cover__lead {
  margin: 20px auto 0;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: rgba(18, 38, 58, 0.9);
}

/* CTA */
.cover__cta {
  margin: 26px auto 0;
  max-width: 320px;
}

.btn-start {
  display: block;
  height: 64px;
  line-height: 64px;
  border-radius: 999px;
  background: #18344d;
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.04em;
  transition: opacity 0.2s ease;
}

.btn-start:hover {
  opacity: 0.85;
}

/* 注意文 */
.cover__note {
  margin: 18px 0 0;
  font-size: 12px;
  color: rgba(18, 38, 58, 0.7);
}

/* ===== SP改行制御 ===== */
.br-sp {
  display: none;
}

@media (max-width: 768px) {
  .br-sp {
    display: inline;
  }

  .cover__title {
    line-height: 1.22;
  }
}

/* ===== PC ===== */
@media (min-width: 769px) {
  .cover__kicker {
    font-size: 17px;
  }

  .cover__title {
    font-size: 40px;
    margin-top: 22px;
  }

  .cover__lead {
    font-size: 17px;
  }

  .cover__cta {
    margin-top: 30px;
    max-width: 360px;
  }

  .btn-start {
    height: 72px;
    line-height: 72px;
    font-size: 22px;
  }
}