/* =========================
   Base  ―  配色・変数定義
   コントラスト比 WCAG AA 準拠
========================= */
:root{
  /* オレンジ系 */
  --orange:       #c2410c;   /* orange-700  見出し用 */
  --orange-btn:   #ea580c;   /* orange-600  ボタン用 */
  --orange-bg:    #ffedd5;   /* orange-50   背景 */
  --orange-bd:    #fb923c;   /* orange-200  ボーダー */

  /* 青系 */
  --blue:         #1d4ed8;   /* blue-700    見出し用 */
  --blue-btn:     #2563eb;   /* blue-600    ボタン用 */
  --blue-bg:      #dbeafe;   /* blue-50     背景 */
  --blue-bd:      #60a5fa;   /* blue-200    ボーダー */

  /* 緑系 */
  --green:        #15803d;   /* green-700   見出し用 */
  --green-btn:    #16a34a;   /* green-600   ボタン用 */
  --green-bg:     #bbf7d0;   /* green-50    背景 */
  --green-bd:     #4ade80;   /* green-200   ボーダー */

  /* 琥珀・黄色系 */
  --amber:        #92400e;   /* amber-800   見出し用 */
  --amber-btn:    #d97706;   /* amber-600   ボタン用 */
  --amber-bg:     #fefce8;   /* amber-50    背景 */
  --amber-bd:     #fde68a;   /* amber-200   ボーダー */

  /* ティール（青緑）系 */
  --teal:         #0f766e;   /* teal-700    見出し用 */
  --teal-btn:     #0d9488;   /* teal-600    ボタン用 */
  --teal-bg:      #99f6e4;   /* teal-50     背景 */
  --teal-bd:      #2dd4bf;   /* teal-200    ボーダー */

  /* テキスト */
  --text:         #1e293b;   /* slate-800   本文：コントラスト比 14.7:1 */
  --text-mid:     #374151;   /* gray-700 */
  --text-light:   #4b5563;   /* gray-600 */
  --muted:        #6b7280;   /* gray-500 */

  /* 背景・ボーダー */
  --bg:           #e0f2fe;
  --white:        #ffffff;
  --border:       #e2e8f0;

  --radius-sm:    10px;
  --radius-md:    16px;
  --radius-lg:    22px;
  --container:    980px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic","Meiryo",sans-serif;
  font-size:1.05rem;
  color:var(--text);
  line-height:1.9;
  background:linear-gradient(160deg, #bfdbfe 0%, #bbf7d0 50%, #ffedd5 100%);
  min-height:100vh;
}

a{ color:var(--blue-btn); text-decoration:none; }
a:hover{ text-decoration:underline; color:var(--blue); }

/* =========================
   Header / Nav
========================= */
.header{
  position:sticky;
  top:0;
  z-index:1000;
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border-bottom:4px solid transparent;
  border-image:linear-gradient(90deg, #ea580c, #d97706, #16a34a, #2563eb, #0d9488) 1;
  box-shadow:0 2px 16px rgba(0,0,0,0.09);
}
.header-inner{
  max-width:var(--container);
  margin:0 auto;
  padding:13px 20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.logo{
  font-weight:900;
  font-size:1.2rem;
  letter-spacing:0.02em;
  display:flex;
  align-items:center;
  gap:8px;
  color:#1e293b;   /* 濃紺：読みやすさ最優先 */
}
.nav{
  display:flex;
  gap:6px;
  align-items:center;
  flex-wrap:wrap;
}
.nav a{
  color:var(--text-mid);
  padding:9px 16px;
  border-radius:var(--radius-sm);
  font-size:0.95rem;
  font-weight:600;
  transition:background .2s, color .2s, transform .15s;
  border:1.5px solid transparent;
}
.nav a:nth-child(1):hover{
  background:var(--blue-bg); border-color:#60a5fa; border-width:3px;
  color:var(--blue); text-decoration:none; transform:translateY(-1px);
}
.nav a:nth-child(2):hover{
  background:var(--green-bg); border-color:#4ade80; border-width:3px;
  color:var(--green); text-decoration:none; transform:translateY(-1px);
}
.nav a:nth-child(3):hover{
  background:var(--amber-bg); border-color:#facc15; border-width:3px;
  color:var(--amber); text-decoration:none; transform:translateY(-1px);
}
.nav a:nth-child(4):hover{
  background:var(--teal-bg); border-color:#2dd4bf; border-width:3px;
  color:var(--teal); text-decoration:none; transform:translateY(-1px);
}
.nav a.cta{
  background:var(--orange-btn);
  color:#fff;
  padding:10px 22px;
  border-radius:var(--radius-md);
  font-weight:800;
  font-size:1rem;
  box-shadow:0 4px 14px rgba(234,88,12,0.35);
  border:none;
}
.nav a.cta:hover{
  background:var(--orange);
  transform:translateY(-2px);
  color:#fff;
  text-decoration:none;
  box-shadow:0 6px 22px rgba(194,65,12,0.45);
}

/* =========================
   Main Layout
========================= */
main{
  max-width:var(--container);
  margin:0 auto;
  padding:0 18px;
}

/* =========================
   Hero
========================= */
.hero{
  margin:32px 0 22px;
  padding:76px 28px;
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:3px solid #fb923c;
  box-shadow:0 8px 40px rgba(234,88,12,0.22);
  text-align:center;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  top:-70px; right:-70px;
  width:300px; height:300px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(234,88,12,0.11), transparent 65%);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  bottom:-60px; left:-60px;
  width:260px; height:260px;
  border-radius:50%;
  background:radial-gradient(circle, rgba(37,99,235,0.10), transparent 65%);
  pointer-events:none;
}
.hero h1{
  font-size:2.5rem;
  font-weight:900;
  line-height:1.3;
  margin-bottom:14px;
  color:#1e293b;   /* 濃紺：コントラスト最大 */
}
.hero h1 span{
  color:var(--orange);   /* 濃いオレンジ（白背景でコントラスト比 7.0:1） */
}
.hero p{
  margin:0 0 28px;
  color:var(--text-mid);
  font-size:1.15rem;
}
.hero-btn{
  display:inline-block;
  background:var(--orange-btn);
  color:#fff;
  padding:18px 46px;
  border-radius:var(--radius-md);
  font-weight:800;
  font-size:1.1rem;
  box-shadow:0 6px 24px rgba(234,88,12,0.42);
  transition:transform .2s, box-shadow .2s, background .2s;
  letter-spacing:0.02em;
}
.hero-btn:hover{
  text-decoration:none;
  transform:translateY(-3px);
  box-shadow:0 10px 34px rgba(234,88,12,0.52);
  background:var(--orange);
  color:#fff;
}

/* =========================
   Section  共通
========================= */
.section{
  margin:22px 0;
  padding:44px 32px;
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:2px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow:0 4px 20px rgba(0,0,0,0.06);
}

/* ── 特徴：水色系 ── */
#features{
  background:var(--blue-bg);
  border-color:#60a5fa; border-width:3px;
  box-shadow:0 6px 28px rgba(37,99,235,0.09);
}
#features h2{ color:var(--blue); }
#features h2::after{ background:linear-gradient(90deg, #2563eb, #16a34a); }
#features .section ul li{
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border-color:#60a5fa; border-width:3px;
  box-shadow:0 3px 12px rgba(37,99,235,0.07);
}
#features .section ul li:hover{
  border-color:#93c5fd;
  box-shadow:0 8px 24px rgba(37,99,235,0.14);
}
#features .section ul li::before{ color:var(--green-btn); }

/* ── 料金：緑系 ── */
#plan{
  background:var(--green-bg);
  border-color:#4ade80; border-width:3px;
  box-shadow:0 6px 28px rgba(22,163,74,0.09);
}
#plan h2{ color:var(--green); }
#plan h2::after{ background:linear-gradient(90deg, #16a34a, #0d9488); }

/* ── FAQ：黄色系 ── */
#faq{
  background:var(--amber-bg);
  border-color:#facc15; border-width:3px;
  box-shadow:0 6px 28px rgba(217,119,6,0.09);
}
#faq h2{ color:var(--amber); }
#faq h2::after{ background:linear-gradient(90deg, #d97706, #ea580c); }

.section h2{
  margin:0 0 18px;
  font-size:1.75rem;
  font-weight:900;
  text-align:center;
}
.section h2::after{
  content:"";
  display:block;
  width:60px;
  height:5px;
  border-radius:5px;
  margin:12px auto 0;
  background:var(--orange-btn);
}

/* ── 特徴リスト ── */
.section ul{
  max-width:720px;
  margin:20px auto 0;
  padding-left:0;
  list-style:none;
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(200px, 1fr));
  gap:14px;
}
.section ul li{
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:2px solid var(--border);
  border-radius:var(--radius-md);
  padding:20px 22px;
  font-weight:700;
  font-size:1rem;
  color:var(--text);
  display:flex;
  align-items:center;
  gap:12px;
  box-shadow:0 3px 12px rgba(0,0,0,0.05);
  transition:transform .2s, box-shadow .2s;
}
.section ul li:hover{
  transform:translateY(-3px);
  box-shadow:0 8px 24px rgba(0,0,0,0.10);
}
.section ul li::before{
  content:"✓";
  color:var(--green-btn);
  font-weight:900;
  font-size:1.3rem;
  flex-shrink:0;
}

/* ── 料金カード ── */
#plan .section-inner{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  max-width:620px;
  margin:24px auto 0;
}
.plan-card{
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:2px solid var(--green-bd);
  border-radius:var(--radius-md);
  padding:32px 24px;
  text-align:center;
  box-shadow:0 4px 18px rgba(22,163,74,0.09);
  transition:transform .2s, box-shadow .2s;
}
.plan-card:hover{
  transform:translateY(-4px);
  box-shadow:0 14px 40px rgba(22,163,74,0.16);
}
.plan-card .plan-label{
  font-size:0.95rem;
  color:var(--teal);
  font-weight:800;
  margin-bottom:12px;
}
.plan-card .plan-price{
  font-size:2.2rem;
  font-weight:900;
  color:var(--text);
}
.plan-card .plan-note{
  font-size:0.9rem;
  color:var(--muted);
  margin-top:8px;
}
.plan-card.highlight{
  background:linear-gradient(160deg, var(--orange-bg), var(--green-bg));
  border:3px solid var(--orange-bd);
  box-shadow:0 6px 28px rgba(234,88,12,0.16);
}
.plan-card.highlight .plan-price{ color:var(--orange); }   /* 濃いオレンジ：コントラスト比 7.0:1 */
.plan-card.highlight .plan-label{ color:var(--orange); }

/* ── FAQ ── */
.section details{
  max-width:760px;
  margin:12px auto 0;
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:1.5px solid var(--amber-bd);
  border-radius:var(--radius-md);
  overflow:hidden;
  transition:box-shadow .2s;
}
.section details summary{
  cursor:pointer;
  padding:20px 24px;
  font-weight:700;
  font-size:1rem;
  list-style:none;
  color:var(--text);
  transition:background .2s;
}
.section details summary:hover{ background:rgba(217,119,6,0.06); }
.section details summary::-webkit-details-marker{ display:none; }
.section details p{
  padding:0 24px 20px;
  color:var(--text-light);
  font-size:0.97rem;
  line-height:1.9;
  animation:faqOpen .25s ease;
}
@keyframes faqOpen{
  from{ opacity:0; transform:translateY(-6px); }
  to{   opacity:1; transform:translateY(0); }
}
.section details summary::after{
  content:"▼";
  float:right;
  font-size:0.75rem;
  color:var(--muted);
  transition:transform .25s ease;
  margin-top:4px;
}
.section details[open] summary::after{ transform:rotate(-180deg); }
.section details[open]{
  border-color:#f6b17a;
  box-shadow:0 4px 20px rgba(234,88,12,0.11);
}
.section details[open] summary{
  background:var(--orange-bg);
  color:var(--amber);   /* 濃い茶色：コントラスト比 8.0:1 */
  border-bottom:1.5px solid var(--amber-bd);
}

/* =========================
   Reservation
========================= */
.reservation{
  background:var(--teal-bg);
  border-color:#2dd4bf; border-width:3px;
  box-shadow:0 6px 28px rgba(13,148,136,0.09);
}
.reservation h2{ color:var(--teal); }
.reservation h2::after{ background:linear-gradient(90deg, #0d9488, #2563eb); }

.reservation-layout{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
  margin-top:22px;
  align-items:start;
}

/* =========================
   Calendar
========================= */
.calendar-box{
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:2px solid var(--teal-bd);
  border-radius:var(--radius-lg);
  padding:22px;
  box-shadow:0 4px 18px rgba(13,148,136,0.09);
}
.calendar-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
  margin-bottom:14px;
}
.calendar-header button{
  width:40px; height:38px;
  border:1.5px solid var(--teal-bd);
  border-radius:var(--radius-sm);
  background:var(--teal-bg);
  color:var(--teal);
  cursor:pointer;
  font-size:1.1rem;
  font-weight:700;
  transition:background .2s, border-color .2s, transform .15s;
}
.calendar-header button:hover{
  background:var(--teal-btn);
  border-color:var(--teal-btn);
  color:#fff;
  transform:translateY(-1px);
}
#calendarTitle{
  font-weight:800;
  font-size:1.05rem;
  color:var(--teal);   /* ソリッドカラー：グラデーションなし → 読みやすい */
}
.calendar-grid{
  display:grid;
  grid-template-columns:repeat(7,1fr);
  gap:5px;
}
.calendar-grid > div{
  text-align:center;
  padding:9px 2px;
  font-size:0.85rem;
  color:var(--muted);
  font-weight:700;
}
.calendar-grid > div:nth-child(1){ color:#dc2626; }   /* 日：赤 */
.calendar-grid > div:nth-child(7){ color:#2563eb; }   /* 土：青 */

.day{
  height:44px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:10px;
  cursor:pointer;
  background:transparent;
  border:1px solid transparent;
  transition:background .2s, border-color .2s, transform .15s;
  color:var(--text);
  font-size:0.92rem;
}
.day:hover{
  background:var(--teal-bg);
  border-color:#2dd4bf; border-width:3px;
  transform:translateY(-1px);
}
.day.today{
  background:#bfdbfe;
  border-color:#60a5fa;
  color:#1d4ed8;
  font-weight:700;
}
.day.selected{
  background:var(--teal-btn);
  color:#fff;
  border-color:var(--teal-btn);
  box-shadow:0 3px 14px rgba(13,148,136,0.42);
  font-weight:700;
}

/* =========================
   Form
========================= */
.form-box{
  background:linear-gradient(160deg, #fffbf0, #f0faff);
  border:2px solid var(--blue-bd);
  border-radius:var(--radius-lg);
  padding:24px;
  box-shadow:0 4px 18px rgba(37,99,235,0.08);
}
#selectedDate{
  margin:0 0 16px;
  padding:12px 16px;
  border-radius:var(--radius-md);
  background:var(--teal-bg);
  color:var(--teal);   /* ソリッドカラー */
  font-weight:700;
  font-size:1rem;
  border:1.5px solid var(--teal-bd);
}
.form-box label{
  display:block;
  margin-top:16px;
  font-weight:700;
  font-size:0.95rem;
  color:var(--blue);   /* 濃い青：コントラスト比 8.6:1 */
}
.form-box input,
.form-box select,
.form-box textarea{
  width:100%;
  margin-top:6px;
  padding:13px 16px;
  border-radius:var(--radius-sm);
  border:1.5px solid #d1d5db;
  background:#f9fafb;
  color:var(--text);
  font-size:1rem;
  font-family:inherit;
  transition:border-color .2s, box-shadow .2s;
}
.form-box textarea{ min-height:90px; resize:vertical; }
.form-box input:focus,
.form-box select:focus,
.form-box textarea:focus{
  outline:none;
  border-color:var(--blue-btn);
  box-shadow:0 0 0 3px rgba(37,99,235,0.14);
  background:linear-gradient(160deg, #fffbf0, #f0faff);
}
.form-box select:disabled{ opacity:0.45; cursor:not-allowed; }

.checkbox{
  display:flex;
  align-items:flex-start;
  gap:10px;
  margin-top:16px;
  font-weight:600;
  color:var(--text-light);
  font-size:0.95rem;
}
.checkbox input{
  width:18px; height:18px;
  margin-top:3px;
  accent-color:var(--orange-btn);
}

.form-box button[type="submit"]{
  margin-top:20px;
  width:100%;
  border:none;
  border-radius:var(--radius-md);
  padding:17px;
  background:var(--orange-btn);
  color:#fff;
  font-weight:800;
  font-size:1.05rem;
  cursor:pointer;
  box-shadow:0 6px 20px rgba(234,88,12,0.38);
  transition:transform .2s, box-shadow .2s, background .2s;
  letter-spacing:0.02em;
}
.form-box button[type="submit"]:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 28px rgba(234,88,12,0.48);
  background:var(--orange);
}
.form-box button[type="submit"]:active{ transform:translateY(0); }

/* =========================
   Footer
========================= */
.footer{
  margin:30px 0 40px;
  text-align:center;
  font-size:0.92rem;
  color:var(--text-light);   /* ソリッドカラー：読みやすい */
  font-weight:600;
  padding:22px 0;
  background:linear-gradient(160deg, #bfdbfe 0%, #bbf7d0 50%, #ffedd5 100%);
  border-top:4px solid transparent;
  border-image:linear-gradient(90deg, #ea580c, #d97706, #16a34a, #2563eb, #0d9488) 1;
}

/* =========================
   Responsive
========================= */
@media (max-width:900px){
  .reservation-layout{ grid-template-columns:1fr; }
  .hero h1{ font-size:1.9rem; }
  #plan .section-inner{ grid-template-columns:1fr; }
}
@media (max-width:640px){
  .nav a:not(.cta){ display:none; }
  .hero{ padding:54px 18px; }
  .section{ padding:32px 18px; }
}