@charset "UTF-8";

.black {
    background-color: #000;
    color: #fff;
}

/* かっこいいデザイン追加 */
:root{
  --bg1: #0f1724;
  --bg2: #071021;
  --accent1: #00e5ff;
  --accent2: #7c4dff;
  --glass: rgba(255,255,255,0.06);
  --glass-2: rgba(255,255,255,0.08);
}

*{box-sizing:border-box}

html,body{
  height:100%;
  margin:0;
  font-family: "Hiragino Kaku Gothic Pro","Yu Gothic","Noto Sans JP",sans-serif;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(124,77,255,0.08), transparent),
              linear-gradient(180deg,var(--bg1),var(--bg2));
  color:#e6f7ff;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:40px 16px;
}

/* 全体カード */
.container{
  width:100%;
  max-width:720px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:18px;
  padding:36px;
  box-shadow: 0 20px 60px rgba(2,6,23,0.6), inset 0 1px 0 rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.03);
  text-align:center;
}

/* 見出し */
header h1{
  margin:0 0 12px 0;
  font-size:1.9rem;
  letter-spacing:0.06em;
  background: linear-gradient(90deg,var(--accent1),var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 6px 30px rgba(124,77,255,0.08);
}

/* 補助テキスト */
p#text{
  margin-top:18px;
  font-size:1.05rem;
  color: #d8f6ff;
  display:inline-block;
  padding:12px 20px;
  border-radius:999px;
  background: linear-gradient(90deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid var(--glass-2);
  box-shadow: 0 6px 24px rgba(2,6,23,0.45);
  min-width:200px;
}

/* ボタン */
#btn{
  margin-top:14px;
  background: linear-gradient(90deg, rgba(0,229,255,0.12), rgba(124,77,255,0.12));
  color: white;
  border: none;
  padding:18px 46px;
  font-size:1.1rem;
  font-weight:700;
  border-radius:40px;
  cursor:pointer;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6), 0 2px 8px rgba(0,229,255,0.06);
  position:relative;
  overflow:hidden;
  transition: transform .18s cubic-bezier(.2,.9,.3,1), box-shadow .18s;
}

/* ボタン上の光るライン */
#btn::before{
  content:'';
  position:absolute;
  left:-60%;
  top:0;
  width:60%;
  height:100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.18), transparent);
  transform: skewX(-20deg);
  transition: left .6s ease;
  pointer-events:none;
}
#btn:hover::before{ left:120%; }

/* ホバー・アクティブ効果 */
#btn:hover{
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0,0,0,0.6), 0 6px 24px rgba(124,77,255,0.14);
}
#btn:active{ transform: translateY(-2px) scale(.99); }

/* 小さい装飾要素 */
.ribbon{
  display:inline-block;
  margin-left:10px;
  padding:6px 10px;
  border-radius:999px;
  background: linear-gradient(90deg,#ffd966,#ff8a65);
  color:#1b0b00;
  font-weight:700;
  font-size:0.85rem;
  box-shadow: 0 6px 18px rgba(255,138,101,0.12);
}

/* アニメーション */
@keyframes pulse {
  0%{ transform: scale(1); opacity:1 }
  50%{ transform: scale(1.03); opacity:0.92 }
  100%{ transform: scale(1); opacity:1 }
}
#btn.pulse{ animation: pulse 1.8s infinite; }

/* レスポンシブ調整 */
@media (max-width:480px){
  .container{ padding:20px; border-radius:14px; }
  header h1{ font-size:1.4rem; }
  #btn{ padding:14px 28px; font-size:1rem; }
  p#text{ font-size:0.95rem; padding:10px 14px; min-width:150px; }
}