/* ===========================================================
   KDC Dance Club — Main Stylesheet (v2: dark / gradient theme)
   Palette:  Base #17121e / Text #f1f1f1
             Gradient: #d43f8d → #0250c5 (signature accent)
   Type:     Zen Kaku Gothic New (JP display, black weight)
             Archivo Black (EN poster words) / Noto Sans JP (body)
   =========================================================== */

:root{
  --bg:         #17121e;
  --bg-soft:    #1f1829;
  --bg-card:    #241c30;
  --ink:        #f1f1f1;
  --ink-soft:   rgba(241,241,241,0.66);
  --ink-faint:  rgba(241,241,241,0.4);
  --pink:       #d43f8d;
  --blue:       #0250c5;
  --grad:       linear-gradient(120deg, #d43f8d 0%, #a54bab 45%, #0250c5 100%);
  --grad-soft:  linear-gradient(120deg, rgba(212,63,141,0.18), rgba(2,80,197,0.18));
  --line:       rgba(241,241,241,0.14);
  --radius-lg:  28px;
  --radius-md:  18px;
  --radius-sm:  10px;
  --shadow-pop: 0 18px 40px rgba(0,0,0,0.45);
  --maxw: 1160px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Noto Sans JP","Zen Kaku Gothic New","Hiragino Sans",sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{
  font-family:"Zen Kaku Gothic New",sans-serif;
  font-weight:900;
  margin:0;
  line-height:1.4;
  letter-spacing:.01em;
}
.poster{ font-family:"Archivo Black","Zen Kaku Gothic New",sans-serif; font-weight:400; }
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 24px; }
:focus-visible{ outline:3px solid var(--pink); outline-offset:3px; }
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

/* ---------- Eyebrow / section label ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:"Archivo Black",sans-serif;
  font-size:.72rem;
  letter-spacing:.18em;
  color:#fff;
  background:var(--grad);
  border-radius:999px;
  padding:8px 18px;
}

.section-head{ text-align:center; max-width:640px; margin:0 auto 48px; }
.section-head h2{ font-size:clamp(1.7rem,4vw,2.6rem); margin-top:18px; color:var(--ink); }
.section-head p{ color:var(--ink-soft); margin-top:14px; }

section{ position:relative; padding:100px 0; }

/* ---------- Gradient beam divider (signature element) ---------- */
.beam-divider{
  position:relative;
  height:4px;
  margin:0 auto;
  max-width:var(--maxw);
  z-index:2;
}
.beam-divider::before{
  content:"";
  position:absolute; inset:0;
  background:var(--grad);
  border-radius:999px;
  opacity:.9;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(23,18,30,0.97);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  min-height:82px;
  overflow:visible;
}
.brand{ display:flex; align-items:center; gap:12px; flex-shrink:0; }
.brand img{ height:44px; width:auto; }
.brand .custom-logo-link{ display:flex; align-items:center; }
.brand .custom-logo-link img.custom-logo{ height:44px; width:auto; max-height:44px; max-width:200px; object-fit:contain; }
.brand-logo-badge{
  display:inline-flex; align-items:center; justify-content:center;
  background:#fff;
  border-radius:0;
  padding:4px 7px;
  flex-shrink:0;
}
.brand-logo-badge .brand-logo{ height:36px; width:auto; max-width:none; display:block; }
.brand-text{ font-family:"Archivo Black",sans-serif; font-weight:400; font-size:1.3rem; letter-spacing:.02em; }
.brand-text span{
  display:block; font-family:"Zen Kaku Gothic New",sans-serif; font-weight:700;
  font-size:.6rem; letter-spacing:.08em; color:var(--ink-soft); margin-top:2px;
}

.main-nav ul{ display:flex; gap:4px; align-items:center; }
.main-nav a{
  font-family:"Archivo Black",sans-serif;
  font-size:.8rem;
  letter-spacing:.05em;
  padding:10px 16px;
  border-radius:999px;
  color:var(--ink-soft);
  transition:color .15s ease, background .15s ease;
}
.main-nav a:hover{ color:#fff; background:rgba(241,241,241,0.08); }
.nav-cta{
  background:var(--grad) !important; color:#fff !important;
  padding:8px 14px !important;
  font-size:.72rem !important;
}
.nav-cta:hover{ filter:brightness(1.1); }

.menu-toggle{ display:none; }

/* ---------- Hero / メインビジュアル ---------- */
.hero{
  position:relative;
  min-height:88vh;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
}
.hero-bg{
  position:absolute; inset:0; z-index:0;
}
.hero-bg-slide{
  position:absolute; inset:0;
  width:100%; height:100%; object-fit:cover; object-position:center 30%;
  opacity:0;
  animation:heroSlideFade 24s ease-in-out infinite;
}
.hero-bg-slide:nth-of-type(1){ animation-delay:0s; }
.hero-bg-slide:nth-of-type(2){ animation-delay:-8s; }
.hero-bg-slide:nth-of-type(3){ animation-delay:-16s; }
@keyframes heroSlideFade{
  0%{ opacity:0; }
  6.25%{ opacity:1; }
  27.08%{ opacity:1; }
  33.33%{ opacity:0; }
  100%{ opacity:0; }
}
@media (prefers-reduced-motion: reduce){
  .hero-bg-slide{ animation:none; opacity:0; }
  .hero-bg-slide:nth-of-type(1){ opacity:1; }
}
.hero-bg::after{
  content:"";
  position:absolute; inset:0;
  z-index:1;
  background:
    linear-gradient(180deg, rgba(23,18,30,.35) 0%, rgba(23,18,30,.55) 55%, var(--bg) 100%),
    linear-gradient(120deg, rgba(212,63,141,.28), rgba(2,80,197,.28));
}
.hero .wrap{
  position:relative;
  z-index:2;
  width:100%;
  padding:120px 24px 80px;
  max-width:760px;
}
@media (min-width:761px){
  .hero .wrap{ max-width:var(--maxw); }
}
.hero-eyebrow{ margin-bottom:20px; }
.hero h1{
  font-size:clamp(2.3rem,5.2vw,3.7rem);
}
.hero h1 em{
  font-style:normal;
  position:relative;
  white-space:nowrap;
}
.hero h1 em::after{
  content:"";
  position:absolute; left:0; right:0; bottom:.06em; height:.28em;
  background:var(--grad); opacity:.55; z-index:-1;
}
.hero-lead{ margin-top:24px; font-size:1.05rem; color:var(--ink-soft); max-width:46ch; }
@media (min-width:761px){
  .hero-lead{ max-width:none; }
}
.hero-actions{ margin-top:36px; display:flex; gap:14px; flex-wrap:wrap; }
.hero-actions .btn{ padding:12px 32px; }

.btn{
  font-family:"Archivo Black",sans-serif;
  font-size:.85rem;
  letter-spacing:.03em;
  padding:16px 32px;
  border-radius:999px;
  display:inline-block;
  transition:transform .15s ease, filter .15s ease, box-shadow .15s ease;
}
.btn-primary{ background:var(--grad); color:#fff; box-shadow:var(--shadow-pop); }
.btn-primary:hover{ transform:translateY(-3px); filter:brightness(1.08); }
.btn-ghost{ background:transparent; color:var(--ink); border:1px solid var(--line); }
.btn-ghost:hover{ border-color:var(--pink); color:#fff; transform:translateY(-3px); }

/* ---------- News / ニュース・告知 ---------- */
.news-section{ background:var(--bg-soft); }
.news-tabs{ display:flex; gap:14px; justify-content:center; margin-bottom:40px; flex-wrap:wrap; }
.news-tab{
  font-family:"Archivo Black",sans-serif;
  font-size:.78rem;
  letter-spacing:.04em;
  padding:12px 26px;
  border-radius:999px;
  background:var(--bg-card);
  border:1px solid var(--line);
  color:var(--ink-soft);
}
.news-tab.is-active{ background:var(--grad); color:#fff; border-color:transparent; }

.news-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:26px;
}
.news-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  overflow:hidden;
  box-shadow:var(--shadow-pop);
  transition:transform .18s ease, border-color .18s ease;
  display:flex; flex-direction:column;
}
.news-card:hover{ transform:translateY(-6px); border-color:var(--pink); }
.news-thumb{ position:relative; aspect-ratio:16/10; background:#000; overflow:hidden; }
.news-thumb img{ width:100%; height:100%; object-fit:cover; opacity:.92; }
.news-tag{
  position:absolute; top:14px; left:14px;
  font-family:"Archivo Black",sans-serif;
  font-size:.68rem; letter-spacing:.04em;
  padding:6px 14px; border-radius:999px;
  background:var(--grad); color:#fff;
}
.news-body{ padding:22px 24px 28px; flex:1; display:flex; flex-direction:column; }
.news-date{ font-family:"Archivo Black",sans-serif; color:var(--ink-faint); font-size:.75rem; letter-spacing:.06em; }
.news-title{ font-size:1.05rem; margin-top:10px; font-weight:700; color:var(--ink); }
.news-excerpt{ margin-top:12px; font-size:.88rem; color:var(--ink-soft); flex:1; }
.news-more{ margin-top:18px; font-family:"Archivo Black",sans-serif; font-size:.72rem; letter-spacing:.04em; }
.news-more span{ background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.news-empty{
  text-align:center; padding:44px; border:1px dashed var(--line); border-radius:var(--radius-md); color:var(--ink-soft);
}
.news-footer{ text-align:center; margin-top:44px; }
.news-footer .btn{ padding:12px 32px; }

/* ---------- About / Dance Club KDC について ---------- */
.about-section .wrap{
  display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center;
}
.about-image{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  aspect-ratio:3/2;
  background:var(--bg-card);
  border:1px solid var(--line);
}
.about-image::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(180deg, transparent 50%, rgba(23,18,30,.7) 100%);
}
.about-image img{ width:100%; height:100%; object-fit:cover; object-position:center 25%; display:block; }
.about-copy h2{ font-size:clamp(1.6rem,3.6vw,2.3rem); color:var(--ink); }
.about-copy .catch{
  margin:22px 0 26px;
  font-size:1.1rem;
  font-weight:700;
  color:#fff;
  border-left:3px solid transparent;
  border-image:var(--grad) 1;
  padding-left:20px;
}
.about-copy p{ color:var(--ink-soft); }
.about-stats{ display:flex; gap:32px; margin-top:36px; flex-wrap:wrap; }
.about-stat b{
  font-family:"Archivo Black",sans-serif; font-weight:400; font-size:2rem; display:block;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent;
}
.about-stat span{ font-size:.82rem; color:var(--ink-soft); }

/* ---------- Class list / クラス一覧 ---------- */
.class-section{ background:var(--bg); }
.class-days{ display:grid; gap:36px; }
.class-day{
  background:var(--bg-card);
  border:1px solid rgba(212,63,141,.5);
  border-radius:var(--radius-md);
  padding:30px 32px;
}
.class-day h3{
  font-family:"Archivo Black","Zen Kaku Gothic New",sans-serif;
  font-weight:400;
  color:var(--ink);
  font-size:1.05rem;
  letter-spacing:.03em;
  margin-bottom:20px;
  display:flex; align-items:center; gap:12px;
  flex-wrap:wrap;
}
.class-day h3::before{ content:""; width:26px; height:3px; background:var(--grad); border-radius:2px; }
.class-list{ display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:16px; }
.class-item{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  padding:20px 22px;
  overflow:hidden;
  position:relative;
  cursor:pointer;
  transition:border-color .15s ease, background .15s ease;
}
.class-item:hover,
.class-item:focus-visible{
  border-color:var(--pink);
  background:var(--bg-card);
}
.class-thumb{
  margin:-20px -22px 16px;
  aspect-ratio:16/10;
  overflow:hidden;
  background:#000;
}
.class-thumb img{ width:100%; height:100%; object-fit:cover; }
.class-item-top{ display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; }
.class-time{ font-family:"Archivo Black",sans-serif; font-weight:400; font-size:.85rem;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.class-studio-group{ display:flex; gap:6px; flex-wrap:wrap; justify-content:flex-end; }
.class-studio{
  font-family:"Archivo Black",sans-serif; font-size:.62rem; letter-spacing:.03em;
  color:rgba(241,241,241,0.88); border:1px solid rgba(241,241,241,0.35); border-radius:999px; padding:4px 10px;
}
.class-name{ font-weight:700; margin-top:8px; color:var(--ink); font-size:1.02rem; }
.class-meta{ font-size:.82rem; color:var(--ink-soft); margin-top:4px; }
.class-desc{ font-size:.85rem; color:var(--ink-soft); margin-top:12px; line-height:1.75; white-space:pre-line; }
.class-link{
  display:inline-block; margin-top:14px;
  font-family:"Archivo Black",sans-serif; font-size:.72rem; letter-spacing:.03em;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent;
}
.class-link:hover{ text-decoration:underline; }

/* ---------- Instructors / 講師一覧 ---------- */
.inst-grid{
  display:grid; grid-template-columns:repeat(6,1fr); gap:24px;
}
.inst-card{ text-align:center; }
.inst-photo{
  position:relative;
  aspect-ratio:1/1;
  border-radius:50%;
  padding:3px;
  background:var(--grad);
}
.inst-photo-inner{
  width:100%; height:100%; border-radius:50%; overflow:hidden; background:var(--bg-card);
}
.inst-photo img{ width:100%; height:100%; object-fit:cover; }
.inst-name{ margin-top:16px; font-family:"Archivo Black",sans-serif; font-weight:400; color:var(--ink); }
.inst-role{ font-size:.78rem; color:var(--ink-soft); margin-top:4px; white-space:pre-line; }

/* ---------- KDC Creative ---------- */
.creative-section{ background:var(--bg-soft); }
.creative-section .wrap{
  display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center;
}
.creative-video{
  border-radius:var(--radius-lg);
  overflow:hidden;
  aspect-ratio:16/9;
  background:#000;
  border:1px solid var(--line);
}
.creative-video iframe,.creative-video img{ width:100%; height:100%; border:0; object-fit:cover; }

/* ---------- Contact / お問い合わせ ---------- */
.contact-section .wrap{ max-width:720px; }
.contact-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:46px;
}
.form-row{ margin-bottom:22px; }
.form-row label{ display:block; font-weight:700; margin-bottom:9px; font-size:.9rem; color:var(--ink); }
.form-row input,.form-row textarea{
  width:100%;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  padding:13px 16px;
  font-family:inherit;
  font-size:.95rem;
  background:var(--bg-soft);
  color:var(--ink);
  transition:border-color .15s ease;
}
.form-row input::placeholder,.form-row textarea::placeholder{ color:var(--ink-faint); }
.form-row input:focus,.form-row textarea:focus{ border-color:var(--pink); outline:none; }
.form-row textarea{ resize:vertical; min-height:130px; }
.form-note{ font-size:.8rem; color:var(--ink-faint); margin-top:8px; }
.contact-alt{ text-align:center; margin-top:30px; color:var(--ink-soft); font-size:.9rem; }
.contact-alt a{ color:#fff; font-weight:700; border-bottom:1px solid var(--pink); }
.form-success{
  background:var(--grad); color:#fff; border-radius:var(--radius-md);
  padding:20px 24px; font-weight:700; margin-bottom:26px;
}

/* ---------- Footer ---------- */
.site-footer{
  background:#0f0c15;
  color:var(--ink);
  padding:70px 0 30px;
  border-top:1px solid var(--line);
}
.footer-top{
  display:flex; justify-content:space-between; align-items:flex-start; gap:40px; flex-wrap:wrap;
  padding-bottom:36px; border-bottom:1px solid var(--line);
}
.footer-brand{ font-family:"Archivo Black",sans-serif; font-size:1.4rem; }
.footer-addr{ margin-top:16px; color:var(--ink-soft); font-size:.9rem; max-width:34ch; }
.footer-nav{ display:flex; gap:36px; flex-wrap:wrap; }
.footer-nav-col h4{ font-family:"Archivo Black",sans-serif; font-weight:400; font-size:.72rem; letter-spacing:.1em; margin-bottom:16px;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.footer-nav-col ul{ display:flex; flex-direction:column; gap:11px; font-size:.9rem; color:var(--ink-soft); }
.footer-nav-col a:hover{ color:#fff; }
.footer-social{ display:flex; gap:14px; }
.footer-social a{
  width:44px; height:44px; border-radius:50%;
  border:1px solid var(--line);
  display:flex; align-items:center; justify-content:center;
  transition:background .15s ease, border-color .15s ease;
}
.footer-social a:hover{ background:var(--grad); border-color:transparent; }
.footer-social svg{ width:19px; height:19px; fill:var(--ink); }
.footer-bottom{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;
  padding-top:26px; font-size:.8rem; color:var(--ink-faint);
}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .about-section .wrap,.creative-section .wrap{ grid-template-columns:1fr; }
  .about-image{ order:-1; }
  .news-grid{ grid-template-columns:repeat(2,1fr); }
  .inst-grid{ grid-template-columns:repeat(3,1fr); }
}
@media (max-width:760px){
  .hero{ min-height:70vh; }
  .hero .wrap{ padding:100px 24px 60px; }
  .site-header .wrap{ position:relative; }
  .main-nav{
    position:fixed; inset:82px 0 0 0; background:var(--bg);
    transform:translateY(-110%); transition:transform .25s ease;
    padding:30px 24px; border-top:1px solid var(--line);
  }
  .main-nav.open{ transform:translateY(0); }
  .main-nav ul{ flex-direction:column; align-items:flex-start; gap:4px; }
  .main-nav a{ width:100%; padding:14px 10px; }
  .menu-toggle{
    display:flex; flex-direction:column; gap:5px; justify-content:center;
    width:44px; height:44px; border:1px solid var(--line); border-radius:12px; background:var(--bg-card);
    flex-shrink:0;
  }
  .menu-toggle span{ width:20px; height:2px; background:var(--ink); margin:0 auto; }
  .news-grid{ grid-template-columns:1fr; }
  .inst-grid{ grid-template-columns:repeat(2,1fr); }
  section{ padding:64px 0; }
  .contact-card{ padding:28px; }
  .footer-top{ flex-direction:column; }
}

/* ---------- Class detail popup modal ---------- */
.class-modal{
  position:fixed; inset:0; z-index:200;
  display:flex; align-items:center; justify-content:center;
  padding:24px;
  opacity:0; visibility:hidden;
  pointer-events:none;
  transition:opacity .2s ease, visibility .2s ease;
}
.class-modal.open{ opacity:1; visibility:visible; pointer-events:auto; }
.class-modal-overlay{
  position:absolute; inset:0;
  background:rgba(10,8,14,.82);
  backdrop-filter:blur(4px);
}
.class-modal-panel{
  position:relative; z-index:2;
  width:100%; max-width:800px;
  max-height:92vh; overflow-y:auto;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:0 30px 70px rgba(0,0,0,.6);
  transform:translateY(24px) scale(.98);
  transition:transform .25s ease;
}
.class-modal.open .class-modal-panel{ transform:translateY(0) scale(1); }
.class-modal-close{
  position:absolute; top:14px; right:14px; z-index:3;
  width:38px; height:38px; border-radius:50%;
  background:rgba(0,0,0,.55); color:#fff;
  border:1px solid rgba(255,255,255,.25);
  font-size:1.4rem; line-height:1; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
}
.class-modal-close:hover{ background:var(--pink); border-color:var(--pink); }
.class-modal-gallery{
  position:relative;
  background:#000;
  min-height:480px;
  max-height:72vh;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
}
.gallery-slide{
  position:absolute; inset:0;
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden;
  transition:opacity .25s ease;
}
.gallery-slide.active{ opacity:1; visibility:visible; }
.gallery-slide img{
  display:block;
  max-width:100%;
  max-height:100%;
  width:auto;
  height:auto;
  margin:0 auto;
}
.gallery-nav{
  position:absolute; top:50%; transform:translateY(-50%);
  width:38px; height:38px; border-radius:50%;
  background:rgba(0,0,0,.55); color:#fff;
  border:1px solid rgba(255,255,255,.3);
  font-size:1.1rem; line-height:1; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  z-index:3;
}
.gallery-nav:hover{ background:var(--pink); border-color:var(--pink); }
.gallery-nav.prev{ left:12px; }
.gallery-nav.next{ right:12px; }
.gallery-dots{
  position:absolute; bottom:12px; left:0; right:0; z-index:3;
  display:flex; justify-content:center; gap:7px;
}
.gallery-dot{
  width:8px; height:8px; border-radius:50%;
  background:rgba(255,255,255,.4);
  border:none; padding:0; cursor:pointer;
  transition:background .15s ease, transform .15s ease;
}
.gallery-dot.active{ background:#fff; transform:scale(1.2); }
.class-modal-body{ padding:28px 30px 34px; }
.class-modal-top{ display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; }
.class-modal-time{ font-family:"Archivo Black",sans-serif; font-size:1rem;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }
.class-modal-studio-group{ display:flex; gap:6px; flex-wrap:wrap; }
.class-modal-studio{
  font-family:"Archivo Black",sans-serif; font-size:.68rem; letter-spacing:.03em;
  color:rgba(241,241,241,0.88); border:1px solid rgba(241,241,241,0.35); border-radius:999px; padding:4px 12px;
}
.class-modal-name{ margin-top:16px; font-size:1.35rem; color:var(--ink); }
.class-modal-meta{ margin-top:8px; color:var(--ink-soft); font-size:.9rem; }
.class-modal-desc{ margin-top:18px; color:var(--ink-soft); font-size:.95rem; line-height:1.85; white-space:pre-line; }

@media (max-width:600px){
  .class-modal-gallery{ min-height:300px; max-height:55vh; }
  .class-modal-body{ padding:24px 22px 28px; }
}