/* ============================================
   Oh studio Hiroshima — Style
   Reference: SCAI THE BATHHOUSE
   Monochrome, whitespace-driven, art-first
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%; /* 1rem = 10px */
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  font-family: "Helvetica Neue", Helvetica, Arial, "Yu Gothic", "YuGothic", "メイリオ", Meiryo, sans-serif;
  font-size: 1.5rem;
  line-height: 1.8;
  color: #333;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: #333;
  text-decoration: none;
  transition: color 0.4s ease;
}

a:hover {
  color: #999;
}

/* --- Container --- */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 30px;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #fff;
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 30px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0 16px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #000;
}

.logo:hover {
  color: #000;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sns-link {
  color: #555;
  display: flex;
  align-items: center;
}

.sns-link:hover {
  color: #999;
}

/* Nav */
.nav {
  display: flex;
  gap: 0;
  padding-bottom: 16px;
  border-bottom: 1px solid #eee;
}

.nav-link {
  font-size: 1.4rem;
  font-weight: 500;
  color: #555;
  letter-spacing: 0.06em;
  padding: 4px 16px 4px 0;
  transition: color 0.4s ease;
}

.nav-link:first-child {
  padding-left: 0;
}

.nav-link:hover {
  color: #999;
}

/* Hamburger */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
  z-index: 200;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 1px;
  background: #333;
  position: absolute;
  left: 0;
  transition: all 0.3s ease;
}

.hamburger span:first-child {
  top: 4px;
}

.hamburger span:last-child {
  bottom: 4px;
}

.hamburger.active span:first-child {
  top: 50%;
  transform: rotate(45deg);
}

.hamburger.active span:last-child {
  bottom: 50%;
  transform: rotate(-45deg);
}

/* Mobile Nav */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 150;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-nav-overlay.active {
  display: block;
  opacity: 1;
}

.mobile-nav {
  position: fixed;
  top: 0;
  right: -260px;
  width: 260px;
  height: 100vh;
  background: #fff;
  z-index: 160;
  padding: 80px 30px 40px;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-nav.active {
  right: 0;
}

.mobile-nav-link {
  font-size: 1.6rem;
  font-weight: 500;
  color: #333;
  letter-spacing: 0.06em;
  padding: 14px 0;
  border-bottom: 1px dotted #ddd;
}

.mobile-nav-link:hover {
  color: #999;
}

/* --- Hero --- */
.hero {
  margin-top: 110px;
  padding: 60px 0 90px;
}

.hero-image {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 30px;
}

.hero-image img {
  width: 100%;
}

.hero-text {
  text-align: center;
  margin-top: 40px;
  padding: 0 30px;
}

.hero-label {
  font-size: 1.2rem;
  font-weight: 500;
  color: #999;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  line-height: 1.3;
  color: #000;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: #787878;
  letter-spacing: 0.04em;
}

/* --- Section --- */
.section {
  padding: 80px 0;
}

.section-header {
  border-bottom: 1px solid #999;
  padding-bottom: 12px;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.0rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: #000;
}

.section-intro {
  margin-bottom: 40px;
}

/* --- Two Column Layout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.two-col--reverse .col-image {
  order: -1;
}

.col-image img {
  width: 100%;
}

.col-image img.illust {
  max-width: 320px;
  margin: 0 auto;
}

/* --- Typography --- */
.concept-lead {
  font-size: 2.2rem;
  font-weight: 300;
  line-height: 1.7;
  color: #000;
  margin-bottom: 30px;
  letter-spacing: 0.04em;
}

.body-text {
  font-size: 1.5rem;
  line-height: 2.0;
  color: #333;
  margin-bottom: 20px;
}

.body-text-small {
  font-size: 1.3rem;
  line-height: 1.8;
  color: #787878;
}

.body-text-small a {
  color: #333;
  border-bottom: 1px solid #ccc;
}

.body-text-small a:hover {
  color: #999;
  border-color: #999;
}

/* --- Floor Blocks --- */
.floor-block {
  margin-bottom: 70px;
  position: relative;
}

.floor-block:last-child {
  margin-bottom: 0;
}

.floor-label {
  font-size: 1.2rem;
  font-weight: 600;
  color: #333;
  letter-spacing: 0.1em;
  border: 1px solid #333;
  display: inline-block;
  padding: 3px 12px;
  margin-bottom: 24px;
}

.floor-name {
  font-size: 1.8rem;
  font-weight: 600;
  color: #000;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

/* --- Artist All Link (TOP page) --- */
.artist-all-link-wrap {
  margin-top: 48px;
}

.artist-all-link {
  display: inline-block;
  font-size: 4.8rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: #000;
  text-decoration: none;
  border-bottom: 1px solid #000;
  padding-bottom: 4px;
  line-height: 1.2;
  transition: color 0.4s ease, border-color 0.4s ease;
}

.artist-all-arrow {
  display: inline-block;
  margin-left: 16px;
  font-size: 3.2rem;
  opacity: 0.4;
  transition: opacity 0.4s ease, transform 0.4s ease;
  vertical-align: middle;
}

.artist-all-link:hover {
  color: #555;
  border-color: #555;
}

.artist-all-link:hover .artist-all-arrow {
  opacity: 1;
  transform: translateX(8px);
}

@media (max-width: 768px) {
  .artist-all-link { font-size: 3.2rem; }
  .artist-all-link::after { font-size: 2.4rem; }
}

/* --- Artist List --- */
.artist-list {
  display: flex;
  flex-direction: column;
}

.artist-item {
  padding: 20px 0;
  border-bottom: 1px dotted #ccc;
  transition: background-color 0.3s ease;
}

.artist-item:first-child {
  border-top: 1px dotted #ccc;
}

.artist-item:hover {
  background-color: #f8f8f8;
}

.artist-name {
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: #333;
}

.artist-note {
  margin-top: 40px;
}

/* --- Info List --- */
.info-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.info-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px dotted #ddd;
}

.info-row:first-child {
  border-top: 1px dotted #ddd;
}

.info-row dt {
  font-size: 1.3rem;
  font-weight: 600;
  color: #555;
  letter-spacing: 0.04em;
}

.info-row dd {
  font-size: 1.4rem;
  color: #333;
  line-height: 1.8;
}

/* --- Full Width Image --- */
.full-image {
  width: 100%;
  overflow: hidden;
}

.full-image img {
  width: 100%;
  height: 50vh;
  object-fit: cover;
}

/* --- Map --- */
.col-map {
  width: 100%;
}

.col-map iframe {
  display: block;
}

/* --- Contact --- */
.contact-body {
  max-width: 560px;
}

.contact-links {
  margin-top: 30px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.4rem;
  font-weight: 500;
  color: #333;
  border: 1px solid #333;
  padding: 12px 28px;
  letter-spacing: 0.06em;
  transition: all 0.4s ease;
}

.contact-btn:hover {
  background: #333;
  color: #fff;
}

.contact-btn svg {
  flex-shrink: 0;
}

.contact-qr {
  margin-top: 40px;
}

.qr-image {
  width: 140px;
  height: 140px;
  object-fit: contain;
  margin-bottom: 8px;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid #eee;
  padding: 30px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 1.2rem;
  color: #999;
  letter-spacing: 0.04em;
}

.back-to-top {
  color: #999;
  display: flex;
  align-items: center;
  transition: color 0.4s ease;
}

.back-to-top:hover {
  color: #333;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  html {
    scroll-padding-top: 80px;
  }

  .container {
    padding: 0 20px;
  }

  /* Header */
  .header-inner {
    padding: 0 20px;
  }

  .header-top {
    padding: 16px 0 12px;
  }

  .nav {
    display: none;
  }

  .hamburger {
    display: block;
  }

  /* Hero */
  .hero {
    margin-top: 60px;
    padding: 30px 0 60px;
  }

  .hero-image {
    padding: 0 20px;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .hero-text {
    padding: 0 20px;
  }

  /* Sections */
  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 36px;
  }

  /* Two Col → Stack */
  .two-col {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .two-col--reverse .col-image {
    order: 0;
  }

  /* Concept */
  .concept-lead {
    font-size: 1.8rem;
  }

  /* Floor */
  .floor-block {
    margin-bottom: 50px;
  }

  /* Info List */
  .info-row {
    grid-template-columns: 100px 1fr;
    gap: 12px;
  }

  /* Full Image */
  .full-image img {
    height: 35vh;
  }

  /* Access */
  .col-map iframe {
    height: 280px;
  }

  /* Footer */
  .footer-copy {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.4rem;
  }

  .concept-lead {
    font-size: 1.6rem;
  }

  .floor-name {
    font-size: 1.6rem;
  }

  .artist-name {
    font-size: 1.6rem;
  }

  .info-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .full-image img {
    height: 28vh;
  }
}