/* =======================
   ■ 基本リセット
   ======================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: #1A3557;
  background: #f7fbff;
  line-height: 1.6;
  position: relative;
}

/* 両サイドの光ライン */
body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 14px;
  background: linear-gradient(
    to bottom,
    rgba(180, 210, 250, 0.3),
    rgba(210, 230, 255, 0.6),
    rgba(180, 210, 250, 0.3)
  );
  backdrop-filter: blur(3px);
  z-index: 9999;
}

body::before {
  left: 0;
}

body::after {
  right: 0;
}

/* =======================
   ■ ヘッダー
   ======================= */
.site-header {
  background: #ffffff;
  padding: 0.6rem 1.2rem;
  border-bottom: 1px solid #d5e2f2;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.site-nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: #2A6FBF;
  font-weight: 600;
}

/* =======================
   ■ HERO
   ======================= */
.hero {
  padding: 3.5rem 1.5rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-label {
  font-size: 0.95rem;
  color: #6ea7e8;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: bold;
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
}

/* ボタン */
.btn {
  padding: 0.8rem 1.4rem;
  border-radius: 8px;
  text-decoration: none;
  text-align: center;
  font-weight: 600;
}

.btn.primary {
  background: #2A6FBF;
  color: #fff;
}

.btn.secondary {
  background: #e7f2ff;
  color: #2A6FBF;
}

/* マリアちゃん立ち絵 */
.hero-placeholder {
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  padding: 0;
  border: none;
  background: none;
}

.maria-img {
  width: 100%;
  height: auto;
  display: block;
}

/* =======================
   ■ セクション
   ======================= */
.section {
  padding: 3rem 1.5rem;
}

/* =======================
   ■ YouTube埋め込み
   ======================= */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1.6rem;
}

.video-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid #cdd8ea;
  box-shadow: 0 3px 8px rgba(100, 140, 200, 0.25);
}

/* アスペクト比固定（16:9） */
.video-inner {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
}

.video-inner iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

/* =======================
   ■ スマホ最適化
   ======================= */
@media (max-width: 768px) {

  /* サイド光ラインを少し細く */
  body::before,
  body::after {
    width: 8px;
  }

  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }

  .site-nav a {
    margin-left: 0;
    margin-right: 0.75rem;
    font-size: 0.9rem;
  }

  /* HERO縦レイアウト */
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .hero-visual {
    order: -1;
    display: flex;
    justify-content: center;
  }

  .hero {
    padding: 2.2rem 1rem 2rem;
  }

  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-desc {
    font-size: 0.92rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-placeholder {
    max-width: 260px;
  }

  .maria-img {
    width: 100%;
  }

  .section {
    padding: 2rem 1.2rem;
  }
}