@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@400;700&display=swap');

/* --- リセット & 基本設定 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Serif JP', serif;
    background-color: #050505; /* 案3の深い黒 */
    color: #ffffff;
    overflow-x: hidden;
    line-height: 1.8;
}

/* --- ヘッダー（中央ロゴスタイル） --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 180px;
    /*
    display: flex;
    justify-content: center;
    align-items: center;
    */
    z-index: 1000;
    
    /* logo_2.jpg のグラデーションを再現 */
    /* 上部：ほぼ純粋な黒(#000000)から、下部：わずかに明るいチャコールグレー(#1a1a1a)へ */
    background: linear-gradient(to bottom, #000000 0%, #1a1a1a 100%);
    
    /* opacity 1 (透過なし) */
    opacity: 0.8;
    
    /* 案3の重厚感を出すための境界線 */
    border-bottom: 1px solid #222;
}

.logo {
  height: auto;
  width: 100px;
  transition: transform 0.3s ease;
  margin: 0 auto 20px;
}

.logo img{
    max-width: 100%;
}

/* --- サイドナビ（縦書き・案3の肝） --- */
.side-nav {
    z-index: 1000;
}

.side-nav ul {
    display: flex;
    gap:20px;
    justify-content: center;
    flex-wrap: wrap;
}

.side-nav li{
    list-style: none;
}

.side-nav a {
    color: #d4af37; /* ゴールド */
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.4em; /* 文字を離して優雅に */
    transition: all 0.4s ease;
    padding-right: 15px;
    border-right: 1px solid #d4af37;
}

.side-nav li:last-child  a{
    border-right:none;
}    

.side-nav a:hover {
    color: #ffffff;
    /*border-right: 1px solid #d4af37;*/
}

/* --- メインビジュアル（Hero） --- */
.hero {
  position: relative;
  height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.4)), url('../img/common/main.jpg') center/cover no-repeat;
  /*margin-top: 140px;
    height: calc(100vh - 140px);*/
}

/* --- キャッチコピーエリア --- */
.hero-content {
  z-index: 2;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 10vh;
  margin: auto;
  height: 300px;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 0.2em;
    margin-bottom: 40px;
    text-shadow: 2px 2px 15px rgba(0,0,0,1);
    
    /* 案3の象徴：左の太い金色の縦線 */
    /*border-left: 10px solid #d4af37;*/
    color: #d4af37;
}

.hero p {
    font-size: 1.4rem;
    letter-spacing: 0.3em;
    margin-bottom: 60px;
    color: #e0e0e0;
    font-weight: 400;
}

/* --- 案3のボタン：ミニマルな枠線スタイル --- */
.btn-gold {
    display: inline-block;
    padding: 16px 70px;
    border: 1px solid #d4af37;
    color: #d4af37;
    text-decoration: none;
    font-size: 0.9rem;
    letter-spacing: 0.5em; /* 文字間隔を広く */
    transition: all 0.5s cubic-bezier(0.2, 1, 0.3, 1);
    background: rgba(0, 0, 0, 0.3);
}

.btn-gold:hover {
    background: #d4af37;
    color: #000;
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.3);
    transform: translateY(-3px);
}

/* --- レスポンシブ設定 --- */
@media (max-width: 1024px) {
    .hero h1 { font-size: 2.8rem; }
    .side-nav { right: 20px; }
}

@media (max-width: 768px) {

    header{
        height: auto;
    }

    .logo{
        margin: 0 auto;
    }


    .side-nav ul {    
        border-top: 1px solid #d4af37;
        gap: 0;

    }        
  .side-nav li {
    width: 50%;
    border-bottom: 1px solid #d4af37;
    text-align: center;
    border-right: 1px solid #d4af37;
    height: 40px;
    align-items: center;
    display: flex;
    justify-content: center;
  }

    .side-nav a{
        border-right: none;
    }

    .hero-content {
        bottom: 18vh;
    }


}