/* 背景とベース */

body{
  margin:0;
  padding:0;
  background-color:#000;
  color:#f0f0f0;
  font-family:"Yu Mincho","Hiragino Mincho ProN",serif;
  overflow-x:hidden;
}

/* 発光ヒエログリフ背景（cover） */

.bg-cover{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;

  background-image:url("/ukon/assets/horus/hieroglyph_bg.png");
  background-size:cover;          /* ← 画面に１枚だけ貼る */
  background-repeat:no-repeat;    /* ← タイル禁止 */
  background-position:center;     /* ← 壁画の中心を基準に配置 */

  z-index:-2;
  opacity:0.30;                   /* ← 壁画としての存在感を薄める */
  filter:blur(6px) brightness(0.9) contrast(1.1);
}

/* 読みやすさのための黒ベール */

.bg-mask{
  position:fixed;
  inset:0;
  background:radial-gradient(
    circle at center,
    rgba(0,0,0,0.0) 0%,
    rgba(0,0,0,0.25) 55%,
    rgba(0,0,0,0.45) 100%
  );
  z-index:-1;
  pointer-events:none;
}

/* 中央レイアウト */

.index-main{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding:32px 16px 40px;
}

/* 「神視色環」ロゴ部分 */

.index-header{
  text-align:center;
  margin-bottom:30px;
}

.logo-title{
  margin:0;
  font-size:30px;
  letter-spacing:0.3em;
  text-indent:0.3em;
  background:linear-gradient(90deg,#f5e0a8,#fff7cf,#f5e0a8);
  -webkit-background-clip:text;
  color:transparent;
  text-shadow:0 0 14px rgba(0,0,0,0.8);
}

.logo-sub{
  display:block;
  margin-top:6px;
  font-size:11px;
  letter-spacing:0.22em;
  text-indent:0.22em;
  color:#f3e0b5;
}

.logo-lead{
  margin:12px 0 0;
  font-size:13px;
  color:#e6e0d2;
}

/* 4つのカード */

.link-grid{
  width:100%;
  max-width:900px;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:18px;
}

.card{
  display:block;
  padding:16px 14px 18px;
  text-decoration:none;
  color:#f5f5f5;
  background:rgba(0,0,0,0.78);
  border-radius:14px;
  border:1px solid rgba(255,220,160,0.5);
  box-shadow:0 0 20px rgba(0,0,0,0.9);
  backdrop-filter:blur(4px);
  transition:
    transform .24s ease,
    box-shadow .24s ease,
    border-color .24s ease,
    background .24s ease;
}

.card-label{
  font-size:11px;
  letter-spacing:0.22em;
  text-transform:uppercase;
  color:#ffdca0;
  margin-bottom:4px;
}

.card-title{
  font-size:16px;
  margin-bottom:4px;
}

.card-text{
  font-size:13px;
  line-height:1.8;
  color:#e2dfd2;
}

/* ホバー時の発光 */

.card:hover{
  transform:translateY(-4px);
  border-color:rgba(255,240,190,0.92);
  box-shadow:0 0 24px rgba(255,230,170,0.7);
  background:rgba(0,0,0,0.9);
}

/* スマホ調整 */

@media(max-width:600px){
  .index-main{
    padding:24px 10px 32px;
  }
}