/* ============================================
   みやこ磨き — ブランド共通スタイル
   ============================================ */

:root{
  /* ── Core palette ── */
  --navy:#1B2A4A;
  --navy-dark:#0F1C35;
  --navy-mid:#243358;
  --navy-ink:#0A1326;

  --gold:#C9A84C;
  --gold-lt:#E2C97A;
  --gold-dk:#9A7A30;

  --cream:#F5F0E8;
  --cream-dk:#EAE3D5;
  --white:#FDFAF6;

  /* ── 伝統色（アクセント） ── */
  --ai:#1F3A5F;       /* 藍 */
  --akane:#B7433B;    /* 茜 */
  --matcha:#7B8F4E;   /* 抹茶 */
  --sumi:#1A1A1A;     /* 墨 */

  --text:#2C2C2C;
  --text-lt:#5A5A5A;

  /* ── Typography ── */
  --font-serif:'Noto Serif JP','Yu Mincho','Hiragino Mincho ProN',serif;
  --font-sans:'Zen Kaku Gothic New','Hiragino Kaku Gothic ProN',-apple-system,sans-serif;

  /* ── Layout ── */
  --maxw:1200px;
  --maxw-narrow:720px;

  /* ── Shadow ── */
  --shadow-gold:0 4px 20px rgba(201,168,76,0.25);
  --shadow-deep:0 8px 40px rgba(0,0,0,0.35);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:var(--font-sans);
  background:var(--navy-dark);
  color:var(--white);
  line-height:1.95;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
@media(min-width:860px){body{font-size:16px;}}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;border:0;background:none;cursor:pointer;color:inherit;}

/* ============================================
   ヘッダー／ナビ
   ============================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(15,28,53,0.85);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(201,168,76,0.2);
  transition:background 0.3s ease;
}
.site-header__inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 clamp(1rem,4vw,2rem);
  height:72px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand__mark{
  width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;
  background:url('logo-dark.svg') center/contain no-repeat;
  flex-shrink:0;
}
.brand__mark > *{display:none;}
.site-footer .brand__mark{width:52px;height:52px;}
.brand__name{
  font-family:var(--font-serif);
  font-size:1.15rem;
  color:var(--white);
  letter-spacing:0.12em;
  line-height:1.2;
}
.brand__name small{
  display:block;
  font-family:var(--font-sans);
  font-size:0.55rem;
  color:var(--gold-lt);
  letter-spacing:0.28em;
  margin-top:2px;
}

.nav{display:flex;align-items:center;gap:clamp(1rem,2.5vw,2rem);}
.nav a{
  font-family:var(--font-serif);
  font-size:1.05rem;
  color:rgba(255,255,255,0.82);
  letter-spacing:0.1em;
  position:relative;
  transition:color 0.2s;
}
.nav a::after{
  content:'';position:absolute;left:0;bottom:-6px;
  width:0;height:1px;background:var(--gold);
  transition:width 0.3s;
}
.nav a:hover{color:var(--gold-lt);}
.nav a:hover::after{width:100%;}
.nav__cta{
  display:inline-flex;align-items:center;gap:6px;
  padding:0.7rem 1.3rem;
  background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dk) 100%);
  color:var(--navy-dark) !important;
  border-radius:3px;
  font-weight:700;
  font-family:var(--font-sans) !important;
  font-size:0.9rem !important;
  letter-spacing:0.1em;
  box-shadow:var(--shadow-gold);
}
.nav__cta::after{display:none;}
.nav__cta:hover{color:var(--navy-dark) !important;transform:translateY(-1px);}

.nav-toggle{
  display:none;
  width:32px;height:32px;
  flex-direction:column;justify-content:center;gap:6px;
}
.nav-toggle span{
  width:24px;height:1px;background:var(--gold-lt);
  transition:0.25s;
}

@media (max-width:860px){
  .nav{
    position:fixed;inset:72px 0 0 0;
    background:var(--navy-dark);
    flex-direction:column;justify-content:flex-start;
    padding:3rem 2rem;gap:2rem;
    transform:translateX(100%);transition:transform 0.35s ease;
  }
  .nav.open{transform:translateX(0);}
  .nav a{font-size:1.2rem;}
  .nav-toggle{display:flex;}
  .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .nav-toggle.open span:nth-child(2){opacity:0;}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
}

/* ============================================
   セクション共通
   ============================================ */
.section{
  padding:clamp(4rem,9vw,7rem) clamp(1rem,4vw,2rem);
  max-width:var(--maxw);
  margin:0 auto;
}
.section--narrow{max-width:var(--maxw-narrow);}
.section-head{
  text-align:center;
  margin-bottom:clamp(2.5rem,5vw,4rem);
}
.section-head__label{
  display:inline-block;
  font-size:0.7rem;
  letter-spacing:0.35em;
  color:var(--gold-lt);
  margin-bottom:1rem;
}
.section-head__label::before,
.section-head__label::after{
  content:'';display:inline-block;
  width:28px;height:1px;
  background:var(--gold);
  vertical-align:middle;
  margin:0 0.75rem;
  opacity:0.6;
}
.section-head__title{
  font-family:var(--font-serif);
  font-size:clamp(1.6rem,3.8vw,2.4rem);
  font-weight:400;
  letter-spacing:0.12em;
  line-height:1.5;
}
.section-head__title span{color:var(--gold);}
.section-head__sub{
  margin-top:1.2rem;
  font-size:1.02rem;
  color:rgba(255,255,255,0.72);
  line-height:2;
}

/* ============================================
   ボタン
   ============================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:1.15rem 2.4rem;
  min-height:56px;
  font-family:var(--font-serif);
  font-size:1.05rem;font-weight:500;
  letter-spacing:0.1em;
  border-radius:3px;
  transition:all 0.25s ease;
  cursor:pointer;
}
.btn--primary{
  background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dk) 100%);
  color:var(--navy-dark);
  box-shadow:var(--shadow-gold);
  font-weight:700;
}
.btn--primary:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 28px rgba(201,168,76,0.5);
}
.btn--ghost{
  background:transparent;
  border:1px solid rgba(201,168,76,0.45);
  color:var(--gold-lt);
}
.btn--ghost:hover{
  border-color:var(--gold);
  background:rgba(201,168,76,0.08);
  color:var(--gold);
}
.btn--line{
  background:#06C755;
  color:#fff;
  box-shadow:0 4px 20px rgba(6,199,85,0.35);
}
.btn--line:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(6,199,85,0.5);}

/* ============================================
   Footer
   ============================================ */
.site-footer{
  background:var(--navy-ink);
  border-top:1px solid rgba(201,168,76,0.2);
  padding:4rem clamp(1rem,4vw,2rem) 2rem;
  margin-top:4rem;
}
.site-footer__inner{
  max-width:var(--maxw);margin:0 auto;
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr;
  gap:3rem;
  padding-bottom:3rem;
  border-bottom:1px solid rgba(201,168,76,0.15);
}
.site-footer__brand .brand{margin-bottom:1.25rem;}
.site-footer__desc{
  font-size:0.8rem;color:rgba(255,255,255,0.55);
  line-height:1.9;max-width:360px;
}
.site-footer h4{
  font-family:var(--font-serif);
  font-size:0.85rem;color:var(--gold-lt);
  letter-spacing:0.2em;margin-bottom:1.2rem;font-weight:500;
}
.site-footer ul{list-style:none;}
.site-footer li{margin-bottom:0.7rem;}
.site-footer a{
  font-size:0.82rem;color:rgba(255,255,255,0.6);
  transition:color 0.2s;
}
.site-footer a:hover{color:var(--gold-lt);}
.site-footer__bottom{
  max-width:var(--maxw);margin:0 auto;
  padding-top:2rem;
  display:flex;justify-content:space-between;align-items:center;
  font-size:0.72rem;color:rgba(255,255,255,0.4);
  letter-spacing:0.1em;
}
@media(max-width:720px){
  .site-footer__inner{grid-template-columns:1fr;gap:2rem;}
  .site-footer__bottom{flex-direction:column;gap:0.75rem;}
}

/* ============================================
   和風装飾モチーフ
   ============================================ */
.kamon-divider{
  display:flex;align-items:center;justify-content:center;
  gap:1rem;margin:clamp(2rem,4vw,3rem) auto;
  opacity:0.6;
}
.kamon-divider::before,.kamon-divider::after{
  content:'';flex:1;max-width:120px;
  height:1px;background:var(--gold);opacity:0.5;
}
.kamon-divider svg{width:20px;height:20px;fill:var(--gold);}

/* ノイズ／和紙テクスチャ */
.washi-bg{
  position:relative;
  background-color:var(--navy-dark);
  background-image:
    radial-gradient(ellipse at 20% 0%,rgba(201,168,76,0.08) 0%,transparent 50%),
    radial-gradient(ellipse at 80% 100%,rgba(31,58,95,0.4) 0%,transparent 50%);
}
.washi-bg::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  opacity:0.04;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2'/></filter><rect width='200' height='200' filter='url(%23n)' opacity='0.6'/></svg>");
}

/* 縦書き */
.vertical-rl{
  writing-mode:vertical-rl;
  -webkit-writing-mode:vertical-rl;
  text-orientation:mixed;
}

/* スクロール時のフェードイン */
.reveal{opacity:0;transform:translateY(24px);transition:opacity 0.9s ease,transform 0.9s ease;}
.reveal.visible{opacity:1;transform:translateY(0);}