/* ===== 基本設定 ===== */
*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

html{
  scroll-behavior:smooth;
}

:root{
  --bg:#f4efe7;
  --card:rgba(255,255,255,.82);
  --line:rgba(60,60,60,.12);
  --text:#1d1d1d;
  --main:#1f2d3d;
  --accent:#8a6f4d;
  --accent2:#b89b78;
  --shadow:0 12px 30px rgba(0,0,0,.08);
  --radius:18px;
  --max:1200px;
}

body{
  font-family:"Noto Serif JP", serif;
  color:var(--text);
  line-height:1.9;
  background:
    linear-gradient(rgba(244,239,231,.74), rgba(244,239,231,.74)),
    url(back/2.jpg)
  background-size:cover;
  background-attachment:fixed;
}

h1,h2,h3,p,a,li,summary,th,td{
  font-family:"Noto Serif JP", serif;
}

a{
  color:inherit;
  text-decoration:none;
}

img{
  max-width:100%;
  display:block;
}

/* ===== ヘッダー ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.header-inner{
  max-width:var(--max);
  margin:0 auto;
  padding:10px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}

.logo img{
  width:64px;
  height:auto;
}

.header-nav{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.header-nav a{
  display:inline-block;
  padding:10px 14px;
  border-radius:999px;
  background:rgba(255,255,255,.6);
  border:1px solid var(--line);
  transition:.25s;
  font-size:.95rem;
}

.header-nav a:hover{
  transform:translateY(-2px);
  background:rgba(31,45,61,.08);
}

.nav-button{
  background:var(--main) !important;
  color:#fff !important;
  border-color:transparent !important;
}

/* ===== ヒーロー ===== */
.hero{
  position:relative;
  min-height:clamp(380px, 52vw, 580px);
  overflow:hidden;
  display:grid;
  place-items:end center;
}

.slides,
.hero-overlay{
  position:absolute;
  inset:0;
}

.slide{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:0;
  animation:fade 35s infinite;
}

.slide:nth-child(1){animation-delay:0s;}
.slide:nth-child(2){animation-delay:5s;}
.slide:nth-child(3){animation-delay:10s;}
.slide:nth-child(4){animation-delay:15s;}
.slide:nth-child(5){animation-delay:20s;}
.slide:nth-child(6){animation-delay:25s;}
.slide:nth-child(7){animation-delay:30s;}

@keyframes fade{
  0%{opacity:0;}
  5%{opacity:1;}
  14%{opacity:1;}
  19%{opacity:0;}
  100%{opacity:0;}
}

.hero-overlay{
  background:linear-gradient(180deg, rgba(0,0,0,.12), rgba(0,0,0,.46));
}

.hero-inner{
  position:relative;
  z-index:2;
  width:min(92%, var(--max));
  margin-bottom:18px;
  padding:24px;
  color:#fff;
  border-radius:24px;
  background:rgba(14,18,24,.28);
  border:1px solid rgba(255,255,255,.18);
  box-shadow:var(--shadow);
  display:grid;
  grid-template-columns:1.6fr .9fr;
  gap:18px;
  align-items:end;
}

.hero-copy{
  text-align:left;
}

.hero-subtitle{
  font-size:.95rem;
  letter-spacing:.08em;
  margin-bottom:6px;
}

.hero-inner h2{
  font-size:clamp(2rem, 4vw, 3.6rem);
  line-height:1.1;
  color:#fff;
  margin-bottom:10px;
}

.hero-text{
  font-size:clamp(1rem, 1.8vw, 1.2rem);
}

.hero-links{
  display:flex;
  flex-direction:column;
  gap:10px;
}

.hero-links a{
  display:block;
  padding:12px 14px;
  border-radius:14px;
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.16);
  color:#fff;
  text-align:center;
  transition:.25s;
}

.hero-links a:hover{
  transform:translateY(-2px);
  background:rgba(255,255,255,.24);
}

/* ===== ページ全体 ===== */
.page{
  max-width:var(--max);
  margin:0 auto;
  padding:18px 16px 60px;
  display:grid;
  grid-template-columns:280px 1fr;
  gap:18px;
  align-items:start;
}

.sidebar{
  position:sticky;
  top:92px;
  display:grid;
  gap:18px;
}

.content{
  min-width:0;
  display:grid;
  gap:18px;
}

/* ===== カード ===== */
.card,
.mini-card,
.notice{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter:blur(6px);
}

.card{
  padding:22px;
}

.small-text a{
  text-decoration: underline;
  color:palevioletred;
}

.mini-card{
  padding:18px;
}

.notice{
  padding:12px 16px;
  text-align:center;
}

/* ===== 見出し ===== */
.card h2,
.mini-card h2{
  font-size:clamp(1.3rem, 2vw, 1.8rem);
  color:var(--main);
  margin-bottom:12px;
}

.card h3{
  font-size:1.1rem;
  color:var(--accent);
  margin:16px 0 8px;
}

.accent-card{
  border-left:6px solid var(--accent);
}

/* ===== 目次 ===== */
.toc-links{
  display:grid;
  gap:10px;
}

.toc-links a{
  display:block;
  padding:11px 12px;
  border-radius:12px;
  background:rgba(255,255,255,.62);
  border:1px solid var(--line);
  transition:.2s;
}

.toc-links a:hover{
  transform:translateX(4px);
  background:rgba(31,45,61,.06);
}

.toc-note{
  margin-top:12px;
  font-size:.92rem;
  color:#666;
}

.notice-mini p{
  margin-bottom:6px;
  font-size:.95rem;
}

.side-button{
  display:block;
  text-align:center;
  padding:12px 14px;
  border-radius:14px;
  margin-top:10px;
  background:var(--main);
  color:#fff;
  transition:.25s;
}

.side-button:hover{
  background:#111a24;
  transform:translateY(-2px);
}

/* ===== 共通テキスト ===== */
.card p{
  margin-bottom:10px;
}

.small-text{
  font-size:.95rem;
  color:#666;
}

/* ===== 便利なリンク ===== */
.link-center{
  text-align:center;
}

.link-center a{
  display:inline-block;
  padding:10px 16px;
  border-radius:999px;
  background:rgba(31,45,61,.08);
  border:1px solid var(--line);
  transition:.25s;
}

.link-center a:hover{
  transform:translateY(-2px);
  background:rgba(31,45,61,.14);
}

/* ===== グリッド ===== */
.feature-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  margin-top:14px;
}

.info-box{
  background:rgba(255,255,255,.62);
  border:1px solid var(--line);
  border-radius:16px;
  padding:16px;
}

.info-box img{
  width:min(280px, 100%);
  margin:10px auto 0;
}

.list{
  padding-left:1.2em;
}

.list li{
  list-style:disc;
  margin-bottom:6px;
}

/* ===== 地図 ===== */
.map-wrap{
  margin:12px 0 18px;
  border-radius:16px;
  overflow:hidden;
  border:1px solid var(--line);
}

.map-wrap iframe{
  width:100%;
  height:280px;
  border:0;
  display:block;
}

/* ===== テーブル ===== */
.data-table{
  width:100%;
  border-collapse:collapse;
  margin:10px 0 18px;
  overflow:hidden;
  border-radius:14px;
}

.data-table th,
.data-table td{
  border:1px solid var(--line);
  padding:12px 10px;
  text-align:left;
  vertical-align:top;
  font-size:.95rem;
}

.data-table th{
  width:34%;
  background:rgba(31,45,61,.06);
  color:var(--main);
  font-weight:700;
}

/* ===== iframe ===== */
.sheet-wrap{
  margin-top:14px;
  border:1px solid var(--line);
  border-radius:16px;
  overflow:hidden;
  background:#fff;
}

.sheet-wrap iframe{
  width:100%;
  height:60vh;
  border:0;
  display:block;
}

/* ===== details ===== */
details{
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(255,255,255,.55);
  padding:10px 14px;
  margin-bottom:10px;
}

summary{
  cursor:pointer;
  font-weight:700;
  color:var(--main);
}

details p{
  margin-top:10px;
}

.section-label{
  margin-top:16px;
  font-weight:700;
  color:var(--accent);
}

/* ===== リンクカード ===== */
.link-cards{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  margin-top:18px;
}

.link-card{
  text-align:center;
  border:1px solid var(--line);
  border-radius:16px;
  background:rgba(255,255,255,.62);
  padding:16px;
}

.link-card img{
  width:min(140px, 60%);
  margin:12px auto 0;
}

/* ===== お知らせカード ===== */
.notice-card{
  text-align:center;
}

/* ===== フッター ===== */
.site-footer{
  background:var(--main);
  color:#fff;
  text-align:center;
  line-height:1.8;
  padding-top: 10px;
}

footer img{
  width: 60px;
  display: inline;
}

/* ===== トップへ戻る ===== */
.back-to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  width:48px;
  height:48px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:var(--main);
  color:#fff;
  box-shadow:var(--shadow);
  z-index:1200;
  transition:.25s;
}

.back-to-top:hover{
  transform:translateY(-2px);
  background:#111a24;
}

/* ===== OK画像 ===== */
.OK{
  position:fixed;
  right:16px;
  bottom:66px;
  z-index:1199;
}

.OK img{
  width:42px;
}

/* ===== レスポンシブ ===== */
@media (min-width: 768px){
  .feature-grid{
    grid-template-columns:1fr 1fr;
  }

  .link-cards{
    grid-template-columns:1fr 1fr;
  }

  .card{
    padding:28px;
  }
}

@media (max-width: 1024px){
  .page{
    grid-template-columns:1fr;
  }

  .sidebar{
    position:static;
  }

  .hero-inner{
    grid-template-columns:1fr;
  }
}

@media (max-width: 767px){
  .header-inner{
    flex-direction:column;
    align-items:flex-start;
  }

  .header-nav{
    justify-content:flex-start;
  }

  .header-nav a{
    font-size:.88rem;
    padding:8px 11px;
  }

  .hero{
    min-height:360px;
  }

  .hero-inner{
    padding:18px;
  }

  .card{
    padding:18px;
  }

  .data-table th,
  .data-table td{
    display:block;
    width:100%;
  }

  .data-table tr{
    display:block;
    margin-bottom:10px;
    border:1px solid var(--line);
    border-radius:12px;
    overflow:hidden;
  }

  .data-table th{
    border-bottom:none;
  }
}

/* ===== ハンバーガー ===== */
.menu-icon{
  display:none;
  flex-direction:column;
  cursor:pointer;
}

.menu-icon span{
  width:26px;
  height:2px;
  background:var(--main);
  margin:5px 0;
  transition:.3s;
}


#menu-btn{
  display:none;
}

/* ===== スマホ用（上書き） ===== */
@media (max-width: 767px){

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


  .menu-icon{
    display:flex;
  }


  .header-nav{
    position:absolute;
    top:70px;
    left:0;
    width:100%;
    background:rgba(255,255,255,.95);
    backdrop-filter:blur(10px);
    flex-direction:column;
    display:none;
    padding:10px 0;
    border-top:1px solid var(--line);
  }

  .header-nav a{
    width:90%;
    margin:6px auto;
    text-align:center;
    border-radius:10px;
  }


  #menu-btn:checked ~ .header-nav{
    display:flex;
  }


  #menu-btn:checked + .menu-icon span:nth-child(1){
    transform:rotate(45deg) translate(5px,5px);
  }

  #menu-btn:checked + .menu-icon span:nth-child(2){
    opacity:0;
  }

  #menu-btn:checked + .menu-icon span:nth-child(3){
    transform:rotate(-45deg) translate(6px,-6px);
  }
}