/* ============================================
   HEADER（最小限・透明感）
============================================ */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(245,241,232,0.85);
  backdrop-filter:blur(20px);
  border-bottom:1px solid var(--rule);
  transition:all 0.3s ease;
}
.nav{
  max-width:var(--container-wide);margin:0 auto;
  padding:18px 40px;
  display:flex;align-items:center;gap:40px;
}
.brand{display:flex;align-items:center;gap:16px;flex-shrink:0;}
.brand-mark{
  width:52px;height:52px;
  background:var(--indigo);
  color:var(--amber-soft);
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  font-family:var(--serif);
  font-weight:700;
  border-radius:2px;
  line-height:1;
  padding:6px 0;
  position:relative;
  box-shadow:inset 0 0 0 1px var(--amber-soft);
}
.brand-mark .mark-main{font-size:22px;line-height:1;}
.brand-mark .mark-sub{
  font-family:var(--serif-en);
  font-size:7px;font-weight:400;
  letter-spacing:0.25em;
  margin-top:4px;
  font-style:italic;
  
}
.brand-text{line-height:1.2;}
.brand-text .en{
  font-family:var(--serif-en);
  font-size:10px;
  letter-spacing:0.35em;
  color:var(--amber);
  text-transform:uppercase;
  font-style:italic;
  font-weight:500;
}
.brand-text .jp{
  font-size:18px;
  font-weight:600;
  letter-spacing:0.12em;
  color:var(--indigo);
  margin-top:2px;
}
.nav-links{
  display:flex;gap:32px;margin-left:auto;align-items:center;
}
.nav-links a{
  font-size:12px;
  letter-spacing:0.2em;
  font-weight:500;
  color:var(--indigo-2);
  position:relative;padding:4px 0;
}
.nav-links a:hover{color:var(--amber);}
.nav-links .nav-school{
  color:var(--wine);
}
.nav-school::before{
  content:"";
  display:inline-block;
  width:5px;height:5px;
  background:var(--wine);
  border-radius:50%;
  margin-right:8px;
  vertical-align:middle;
}
.nav-cta{
  padding:12px 28px;
  background:var(--indigo);
  color:var(--ivory);
  font-size:12px;
  letter-spacing:0.2em;
  font-weight:600;
  transition:all 0.35s ease;
  border:1px solid var(--indigo);
}
.nav-cta:hover{
  background:transparent;color:var(--indigo);
}
.menu-toggle{display:none;font-size:24px;}

/* モバイルメニュー展開時 */
.nav-links.open{
  display:flex;
  position:absolute;
  top:100%;
  left:0;
  right:0;
  flex-direction:column;
  background:var(--ivory);
  padding:var(--sp-md);
  border-bottom:1px solid var(--rule);
  gap:18px;
  z-index:100;
  box-shadow:0 8px 24px rgba(0,0,0,0.1);
}

/* ============================================
   HERO（静謐の美学）
============================================ */
.hero{
  position:relative;
  padding:60px 40px 120px;
  background:var(--ivory);
  overflow:hidden;
}
/* 余白に漂う光の粒子 */
.hero::before{
  content:"";position:absolute;
  top:15%;right:-10%;
  width:700px;height:700px;
  background:radial-gradient(circle, rgba(176,136,84,0.08), transparent 60%);
  border-radius:50%;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;
  bottom:-10%;left:-10%;
  width:500px;height:500px;
  background:radial-gradient(circle, rgba(26,35,51,0.05), transparent 60%);
  border-radius:50%;pointer-events:none;
}
.hero-inner{
  max-width:var(--container-wide);margin:0 auto;
  position:relative;z-index:2;
  display:grid;
  grid-template-columns:1.2fr 0.8fr;
  gap:80px;align-items:stretch;
}
.hero-content{
  display:flex;flex-direction:column;justify-content:center;
}
.hero-kicker{
  display:inline-flex;align-items:center;gap:18px;
  font-family:var(--serif-en);
  font-size:13px;
  letter-spacing:0.4em;
  color:var(--amber);
  text-transform:uppercase;
  margin-bottom:40px;
  font-style:italic;
  font-weight:500;
}
.hero-kicker::before,.hero-kicker::after{
  content:"";
  width:50px;height:1px;
  background:var(--amber);
  opacity:0.5;
}
.hero-title{
  font-family:var(--serif);
  font-size:clamp(34px, 4.8vw, 68px);
  font-weight:600;
  line-height:1.4;
  letter-spacing:0.04em;
  margin-bottom:40px;
  color:var(--indigo);
}
.hero-title .line-break{display:block;}
.hero-title .emphasis{
  color:var(--wine);
  font-weight:700;
  position:relative;
}
.hero-title .emphasis::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-4px;
  height:1px;
  background:var(--amber-soft);
}
.hero-title .thin{
  font-weight:400;
  color:var(--indigo-3);
  font-size:0.7em;
  letter-spacing:0.1em;
}
.hero-desc{
  font-size:17px;
  max-width:580px;
  color:var(--indigo-2);
  margin-bottom:48px;
  line-height:2.1;
  font-weight:400;
}
.hero-desc strong{
  color:var(--indigo);
  font-weight:600;
  border-bottom:1px solid var(--amber-soft);
  padding-bottom:1px;
}
.hero-cta-wrap{
  display:flex;flex-direction:column;gap:16px;
  max-width:440px;
}
.btn-primary{
  display:flex;align-items:center;gap:16px;
  padding:24px 36px;
  background:var(--indigo);
  color:var(--ivory);
  border-radius:2px;
  transition:all 0.4s ease;
  position:relative;
  overflow:hidden;
}
.btn-primary::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
  transform:translateX(-100%);transition:transform 0.8s ease;
}
.btn-primary:hover::before{transform:translateX(100%);}
.btn-primary:hover{
  background:var(--wine);
  transform:translateY(-2px);
  box-shadow:var(--shadow-soft);
}
.btn-primary .icon{
  width:44px;height:44px;
  background:rgba(255,255,255,0.1);
  border-radius:50%;
  display:grid;place-items:center;
  font-size:18px;flex-shrink:0;
}
.btn-primary .content{flex:1;text-align:left;}
.btn-primary .content .label{
  font-size:11px;
  letter-spacing:0.25em;
  color:var(--amber-soft);
  display:block;margin-bottom:4px;
  font-family:var(--serif-en);
  font-style:italic;
}
.btn-primary .content .main{
  font-size:17px;font-weight:600;
  letter-spacing:0.08em;
}
.btn-primary .arrow{font-size:18px;opacity:0.6;}
.btn-secondary{
  display:flex;align-items:center;gap:16px;
  padding:24px 36px;
  background:transparent;
  color:var(--indigo);
  border:1px solid var(--indigo);
  border-radius:2px;
  transition:all 0.4s ease;
}
.btn-secondary:hover{
  background:var(--indigo);color:var(--ivory);
  transform:translateY(-2px);
}
.btn-secondary .icon{
  width:44px;height:44px;
  background:var(--amber);
  color:var(--ivory);
  border-radius:50%;
  display:grid;place-items:center;
  font-size:18px;flex-shrink:0;
}
.btn-secondary .content{flex:1;text-align:left;}
.btn-secondary .content .label{
  font-size:11px;
  letter-spacing:0.25em;
  color:var(--amber);
  display:block;margin-bottom:4px;
  font-family:var(--serif-en);
  font-style:italic;
}
.btn-secondary .content .main{
  font-size:17px;font-weight:600;
  letter-spacing:0.08em;
}
.btn-secondary .arrow{font-size:18px;opacity:0.4;}

/* Hero visual side */
.hero-visual{
  position:relative;
  aspect-ratio:4/5;
  background:#000;
  overflow:hidden;
  box-shadow:var(--shadow-strong);
}
/* バイオリン画像層：はっきり表示 */
.hero-visual::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url(/images/kaitorido-hero-violin.jpg?v=20260703);
  background-size:cover;
  background-position:center center;
  background-repeat:no-repeat;
  z-index:1;
}
/* 上下グラデーションオーバーレイ：テキスト可読性確保 */
.hero-visual::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(180deg, 
      rgba(15,23,36,0.75) 0%, 
      rgba(15,23,36,0.35) 25%,
      rgba(15,23,36,0.15) 50%,
      rgba(15,23,36,0.35) 75%,
      rgba(15,23,36,0.75) 100%
    );
  z-index:2;
  pointer-events:none;
}
/* 縦線テクスチャ層 */
.hero-visual-texture{
  position:absolute;
  inset:0;
  background:
    repeating-linear-gradient(
      180deg,
      transparent 0,
      transparent 40px,
      rgba(176,136,84,0.05) 40px,
      rgba(176,136,84,0.05) 41px
    );
  z-index:3;
  pointer-events:none;
}
.hero-visual-text{
  position:absolute;
  top:20%;left:50%;
  transform:translate(-50%,0);
  text-align:center;
  color:var(--amber-light);
  width:85%;
  z-index:4;
  text-shadow:0 2px 20px rgba(0,0,0,0.9), 0 0 40px rgba(0,0,0,0.7);
}
.hero-visual-text .small-label{
  font-family:var(--serif-en);
  font-size:10px;
  letter-spacing:0.5em;
  color:var(--amber-soft);
  margin-bottom:14px;
  font-style:italic;
  text-transform:uppercase;
}
.hero-visual-text .jp-label{
  font-size:12px;
  letter-spacing:0.4em;
  color:rgba(229,208,174,0.85);
  margin-bottom:16px;
  font-weight:500;
}
.hero-visual-text .main-kanji{
  font-size:clamp(54px, 7vw, 88px);
  font-weight:600;
  line-height:1.15;
  letter-spacing:0.08em;
  color:var(--amber-light);
  margin-bottom:14px;
  text-shadow:0 3px 30px rgba(0,0,0,0.95), 0 0 60px rgba(0,0,0,0.9);
}
.hero-visual-text .main-kanji span{
  display:block;
  font-size:0.28em;
  letter-spacing:0.6em;
  color:var(--amber-soft);
  font-style:italic;
  font-family:var(--serif-en);
  font-weight:400;
  margin-top:8px;
}
.hero-visual-text .quote{
  display:none;
}
.hero-visual-corner{
  position:absolute;
  font-family:var(--serif-en);
  font-size:10px;
  letter-spacing:0.3em;
  color:rgba(229,208,174,0.85);
  text-transform:uppercase;
  font-style:italic;
  z-index:4;
  text-shadow:0 1px 6px rgba(0,0,0,0.9);
}
.hero-visual-corner.tl{top:24px;left:24px;}
.hero-visual-corner.tr{top:24px;right:24px;text-align:right;}
.hero-visual-corner.bl{bottom:24px;left:24px;}
.hero-visual-corner.br{bottom:24px;right:24px;text-align:right;}

/* バイオリン画像キャプション */
.hero-visual-caption{
  position:absolute;
  bottom:56px;
  left:50%;
  transform:translateX(-50%);
  z-index:4;
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
}
.caption-line{
  width:40px;
  height:1px;
  background:linear-gradient(90deg, transparent, var(--amber-soft), transparent);
}
.caption-text{
  display:flex;
  flex-direction:column;
  gap:4px;
}
.caption-en{
  font-family:var(--serif-en);
  font-size:10px;
  letter-spacing:0.4em;
  color:var(--amber-light);
  font-style:italic;
  text-transform:uppercase;
  font-weight:500;
  text-shadow:0 1px 8px rgba(0,0,0,0.9);
}
.caption-jp{
  font-size:11px;
  letter-spacing:0.3em;
  color:rgba(229,208,174,0.85);
  font-weight:500;
  text-shadow:0 1px 8px rgba(0,0,0,0.9);
}

/* Hero stats bar (下部バー) */
.hero-stats-bar{
  max-width:var(--container-wide);margin:80px auto 0;
  padding:40px 40px;
  position:relative;z-index:2;
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:0;
  background:var(--pearl);
  border:1px solid var(--rule);
  box-shadow:var(--shadow-soft);
}
.hero-stat{
  padding:0 40px;
  border-right:1px solid var(--rule);
  position:relative;
}
.hero-stat:last-child{border-right:none;}
.hero-stat-en{
  font-family:var(--serif-en);
  font-size:11px;
  letter-spacing:0.3em;
  color:var(--amber);
  margin-bottom:10px;
  text-transform:uppercase;
  font-style:italic;
}
.hero-stat-num{
  font-family:var(--serif);
  font-size:36px;
  font-weight:600;
  color:var(--indigo);
  line-height:1;
  margin-bottom:8px;
  letter-spacing:-0.01em;
}
.hero-stat-num .unit{
  font-size:16px;
  color:var(--silver);
  margin-left:4px;
  font-weight:500;
}
.hero-stat-label{
  font-size:12px;
  letter-spacing:0.12em;
  color:var(--indigo-2);
  line-height:1.5;
}

/* ============================================
   SECTION BASE
============================================ */
.section{
  padding:var(--sp-section);
  position:relative;
}
.section-inner{max-width:var(--container-wide);margin:0 auto;}
.section-head{text-align:center;margin-bottom:80px;}
.section-kicker{
  display:inline-flex;align-items:center;gap:18px;
  font-family:var(--serif-en);
  font-size:12px;
  letter-spacing:0.45em;
  color:var(--amber);
  text-transform:uppercase;
  margin-bottom:28px;
  font-style:italic;
  font-weight:500;
}
.section-kicker::before,.section-kicker::after{
  content:"";
  width:40px;height:1px;
  background:var(--amber);
  opacity:0.5;
}
.section-title{
  font-size:clamp(30px, 3.8vw, 48px);
  font-weight:600;
  line-height:1.5;
  letter-spacing:0.04em;
  margin-bottom:24px;
  color:var(--indigo);
}
.section-title .accent{
  color:var(--wine);
  font-weight:700;
}
.section-sub{
  font-size:16px;
  color:var(--indigo-2);
  max-width:var(--container-narrow);
  margin:0 auto;
  line-height:2.1;
  font-weight:400;
}

--container-narrow);
  margin:0 auto;
  line-height:2.1;
  font-weight:400;
}
/*a11y-20260703*/.brand-mark{background:#C9A96E}.brand-text .en{color:#7D6234}