/* =========================
   CTA全体
========================= */
.cta {
  position: relative;
  padding: 120px 20px;
  text-align: center;
  color: #fff;
  overflow: hidden;
  background:
    linear-gradient(rgba(5,15,30,0.85), rgba(5,15,30,0.95)),
    url("../images/hero.png") center/cover no-repeat;
}

/* グラデで下に馴染ませる */
.cta::after {
  content: "";
  position: absolute;
  bottom: 0;
  width: 100%;
}

/* コンテンツ */
.cta .container {
  position: relative;
  z-index: 2;
}

/* 見出し */
.cta h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 30px;
  letter-spacing: 1px;
}

/* =========================
   ボタン
========================= */
.cta .btn {
  display: inline-block;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  color: #fff;

  background: linear-gradient(135deg, #4da3ff, #0b2a4a);
  box-shadow: 0 10px 30px rgba(77,163,255,0.3);

  transition: all 0.3s ease;
}

/* hover */
.cta .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(77,163,255,0.5);
}

/* =========================
   光エフェクト
========================= */
.cta::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(77,163,255,0.2), transparent 70%);
  z-index: 1;
}