* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #000;
  color: #fff;
  position: relative;
  overflow-x: hidden;
}

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

/* ===== 光背景 ===== */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,215,0,0.15), transparent 40%),
    radial-gradient(circle at 70% 70%, rgba(255,215,0,0.1), transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(255,255,255,0.05), transparent 50%);
  animation: glowMove 15s infinite alternate;
  pointer-events: none;
  z-index: -1;
}

@keyframes glowMove {
  0% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-5%, 5%) scale(1.1); }
  100% { transform: translate(5%, -5%) scale(1); }
}

/* ===== ヘッダー ===== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: rgba(0,0,0,0.9);
  border-bottom: 1px solid gold;
  position: relative;
  z-index: 100;
}

h1 {
  color: gold;
  letter-spacing: 2px;
  margin: 0;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav a {
  color: #ccc;
  text-decoration: none;
  transition: 0.3s;
}

nav a:hover {
  color: gold;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
}

.hero-slider {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-slide {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transform: scale(1.05);
  transition: opacity 1.5s ease, transform 6s ease;
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1.1);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.3), #000);
  z-index: 5;
}

.hero-text {
  position: relative;
  z-index: 10;
  top: 50%;
  transform: translateY(-50%);
  text-align: center;
  padding: 0 20px;
}

.hero h2 {
  font-size: 50px;
  color: gold;
  margin: 0 0 16px;
}

.hero p {
  color: #ccc;
  margin: 0;
}

/* ===== ROOM ===== */
.rooms {
  padding: 80px 20px;
  text-align: center;
}

.rooms h2 {
  color: gold;
  margin-bottom: 40px;
}

.room-slider {
  max-width: 1000px;
  margin: auto;
  overflow: hidden;
  position: relative;
  padding: 0 48px;
}

.room-track {
  display: flex;
  gap: 20px;
  transition: transform 0.5s ease;
}

.room-card {
  min-width: calc((100% - 40px) / 3);
  flex-shrink: 0;
  height: 250px;
  border-radius: 15px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  position: relative;
  overflow: hidden;
  padding-bottom: 24px;
  transition: transform 0.3s;
}

.room-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 60%;
  width: 100%;
  background: linear-gradient(transparent, rgba(0,0,0,0.9));
  border-radius: 15px;
  z-index: 1;
}

.room-card {
  z-index: 1;
}

.room-card:hover {
  transform: scale(1.03);
  z-index: 2;
}

/* 矢印 */
.prev,
.next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  background: rgba(0,0,0,0.7);
  border: 1px solid gold;
  color: gold;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  z-index: 10;
}

.prev { left: 0; }
.next { right: 0; }

/* ===== PRICE ===== */
.price {
  padding: 80px 20px;
  text-align: center;
}

.price h2 {
  color: gold;
}

.price-image {
  max-width: 1000px;
  margin: 0 auto;
}

.price img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid gold;
}

/* ===== BUSINESS ===== */
.business-box {
  display: block;
  margin: 60px auto;
  max-width: 700px;
  padding: 30px;
  border: 1px solid gold;
  border-radius: 15px;
  text-align: center;
  text-decoration: none;
  color: #fff;
  transition: 0.3s;
}

.business-box h3,
.business-box p {
  margin-left: 0;
  margin-right: 0;
}

.business-box:hover {
  background: rgba(255,215,0,0.1);
}

/* ===== INSTAGRAM ===== */
.insta-box {
  display: block;
  margin: 60px auto;
  max-width: 700px;
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(
    45deg,
    #feda75,
    #fa7e1e,
    #d62976,
    #962fbf,
    #4f5bd5
  );
  transition: 0.3s;
}

.insta-box h3 {
  font-size: 28px;
  margin-bottom: 10px;
}

.insta-box p {
  opacity: 0.9;
}

.insta-box h3::before {
  content: "📷 ";
}

.insta-box:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 30px rgba(0,0,0,0.7);
}

/* ===== ACCESS ===== */
.access {
  padding: 80px 20px;
  text-align: center;
}

.access h2 {
  color: gold;
}

.access-info {
  margin: 20px auto;
  text-align: left;
  display: block;
  max-width: 400px;
  color: #ccc;
  line-height: 1.8;
  font-size: 16px;
}

.tel-btn {
  display: inline-block;
  margin: 20px 0;
  padding: 15px 30px;
  background: linear-gradient(135deg, gold, orange);
  color: #000;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  box-shadow: 0 0 15px rgba(255,215,0,0.35);
}

.access iframe {
  width: 100%;
  height: 300px;
  border: 0;
  border-radius: 10px;
}

/* ===== ビジネスページ ===== */
.business-hero {
  min-height: 420px;
  padding: 120px 20px;
  text-align: center;
  background:
    linear-gradient(rgba(0,0,0,0.55), rgba(0,0,0,0.9)),
    url('bg.jpg') center / cover;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.business-hero h2 {
  color: gold;
  font-size: 48px;
  letter-spacing: 4px;
  margin: 0 0 16px;
}

.business-hero p {
  color: #ccc;
  margin: 0;
}

.business-detail {
  padding: 80px 20px;
  text-align: center;
}

.business-detail h2,
.business-cta h2 {
  color: gold;
}

.business-detail p {
  color: #ddd;
  line-height: 2;
}

.business-features {
  max-width: 900px;
  margin: 40px auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature {
  border: 1px solid gold;
  border-radius: 12px;
  padding: 20px 10px;
  background: rgba(255,215,0,0.08);
}

.receipt-box {
  max-width: 900px;
  margin: 50px auto 0;
}

.receipt-box h3 {
  color: gold;
}

.receipt-box img {
  margin: 0 auto;
  border: 1px solid gold;
  border-radius: 10px;
}

.business-cta {
  padding: 60px 20px 80px;
  text-align: center;
}

/* ===== フッター ===== */
footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid gold;
  color: #888;
}

/* ===== 見出し強化 ===== */
.rooms h2,
.price h2,
.access h2,
.business-detail h2,
.business-cta h2 {
  font-size: 48px;
  letter-spacing: 5px;
  text-shadow:
    0 0 5px rgba(255,215,0,0.5),
    0 0 15px rgba(255,215,0,0.4),
    0 0 30px rgba(255,215,0,0.3);
  animation: glowText 3s ease-in-out infinite alternate;
}

.rooms h2::after,
.price h2::after,
.access h2::after,
.business-detail h2::after,
.business-cta h2::after {
  content: "";
  display: block;
  width: 80px;
  height: 2px;
  margin: 15px auto 0;
  background: linear-gradient(to right, transparent, gold, transparent);
}

@keyframes glowText {
  0% {
    text-shadow:
      0 0 5px rgba(255,215,0,0.4),
      0 0 10px rgba(255,215,0,0.3);
  }
  100% {
    text-shadow:
      0 0 10px rgba(255,215,0,0.8),
      0 0 25px rgba(255,215,0,0.6),
      0 0 40px rgba(255,215,0,0.4);
  }
}

/* ===== タブレット ===== */
@media (max-width: 900px) {
  .business-features {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== スマホ ===== */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    text-align: center;
    padding: 16px 12px;
  }

  h1 {
    font-size: 24px;
  }

  nav {
    margin-top: 12px;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 16px;
  }

  nav a {
    font-size: 14px;
  }

  .hero {
    height: 86vh;
    min-height: 520px;
  }

  .hero h2 {
    font-size: 34px;
    line-height: 1.25;
  }

  .hero p {
    font-size: 15px;
  }

  .rooms,
  .price,
  .access,
  .business-detail {
    padding: 56px 14px;
  }

  .rooms h2,
  .price h2,
  .access h2,
  .business-detail h2,
  .business-cta h2 {
    font-size: 34px;
    letter-spacing: 3px;
  }

  .room-slider {
    padding: 0 42px;
  }

  .room-track {
    gap: 14px;
  }

  .room-card {
    min-width: 100%;
    height: 230px;
  }

  .prev,
  .next {
    width: 38px;
    height: 38px;
    font-size: 26px;
  }

  .business-box,
  .insta-box {
    margin: 40px 14px;
    padding: 24px 16px;
  }

  .access-info {
    max-width: 100%;
    font-size: 15px;
  }

  .tel-btn {
    width: min(100%, 320px);
    text-align: center;
  }

  .access iframe {
    height: 260px;
  }

  .business-hero {
    min-height: 360px;
    padding: 90px 20px;
  }

  .business-hero h2 {
    font-size: 36px;
  }

  .business-features {
    grid-template-columns: 1fr;
  }
}

/* ===== 小さいスマホ ===== */
@media (max-width: 420px) {
  h1 {
    font-size: 22px;
  }

  nav a {
    font-size: 13px;
  }

  .hero h2 {
    font-size: 30px;
  }

  .rooms h2,
  .price h2,
  .access h2,
  .business-detail h2,
  .business-cta h2 {
    font-size: 30px;
  }

  .room-slider {
    padding: 0 36px;
  }

  .room-card {
    height: 210px;
  }
}