/* ============================================
   case-study-yuakari.css
   湯灯商會 Tourism WordPress — Warm Traditional · 2026
   ============================================ */
:root{
    --ya-bg:#17110D;
    --ya-bg-mid:#241A14;
    --ya-paper:#F2E8D6;
    --ya-paper-dk:#D8C8A8;
    --ya-ink:#F6EFE0;
    --ya-ink-mid:#BDAF95;
    --ya-ink-lt:#7E7362;
    --ya-ember:#C4623A;
    --ya-ember-dk:#8B3F22;
    --ya-lantern:#E8B56E;
    --ya-night:#2D1410;
    --ya-line:rgba(246,239,224,.14);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
    background:var(--ya-bg);
    color:var(--ya-ink);
    font-family:'Noto Serif JP',serif;
    font-weight:300;
    line-height:1.9;
    overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}

/* Grain */
body::after{
    content:'';position:fixed;inset:0;pointer-events:none;z-index:9998;
    background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
    opacity:.6
}

/* ランタンの光 */
.ya-lantern-glow{
    position:absolute;pointer-events:none;z-index:0;
    width:500px;height:500px;border-radius:50%;
    background:radial-gradient(circle,rgba(232,181,110,.18),transparent 60%);
    filter:blur(40px);
}

/* NAV */
.ya-nav{
    position:fixed;top:0;left:0;right:0;z-index:200;
    display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
    padding:clamp(.9rem,1.5vw,1.2rem) clamp(1rem,3vw,2.5rem);
    background:rgba(23,17,13,.82);
    backdrop-filter:blur(12px);
    border-bottom:1px solid var(--ya-line);
}
.ya-nav__logo{font-family:'Noto Serif JP',serif;font-weight:500;letter-spacing:.08em;font-size:1.1rem}
.ya-nav__logo span{color:var(--ya-lantern)}
.ya-nav__center{text-align:center;font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.3em;color:var(--ya-lantern);text-transform:uppercase}
.ya-nav__back{justify-self:end;font-family:'Noto Serif JP',serif;font-size:.9rem;letter-spacing:.08em;color:var(--ya-ink-mid);transition:.3s}
.ya-nav__back:hover{color:var(--ya-lantern)}

/* Container */
.ya-wrap{max-width:1260px;margin:0 auto;padding:0 clamp(1rem,3vw,2rem);position:relative}

/* HERO */
.ya-hero{padding:clamp(7rem,12vw,10rem) 0 clamp(3rem,6vw,5rem);position:relative;overflow:hidden}
.ya-hero::before{
    content:'湯';position:absolute;top:80px;left:-40px;
    font-family:'Noto Serif JP',serif;font-weight:900;
    font-size:clamp(16rem,34vw,38rem);
    color:rgba(196,98,58,.08);line-height:1;
    pointer-events:none;user-select:none;z-index:0;
}
.ya-hero__inner{position:relative;z-index:1}
.ya-hero__stamp{
    display:inline-flex;align-items:center;gap:.6rem;
    padding:.5rem 1.1rem;border:1px solid var(--ya-lantern);
    font-family:'DM Mono',monospace;font-size:.75rem;letter-spacing:.25em;
    color:var(--ya-lantern);text-transform:uppercase;margin-bottom:2rem;
}
.ya-hero__stamp::before{content:'';width:6px;height:6px;background:var(--ya-ember);border-radius:50%}
.ya-hero__no{font-family:'DM Mono',monospace;font-size:.85rem;letter-spacing:.3em;color:var(--ya-lantern);margin-bottom:.8rem}
.ya-hero__title{
    font-family:'Noto Serif JP',serif;font-weight:500;
    font-size:clamp(2.6rem,7vw,6.2rem);line-height:1.15;letter-spacing:.02em;
    margin-bottom:1.5rem;
}
.ya-hero__title em{font-family:'Noto Serif JP',serif;font-weight:600;font-style:normal;color:var(--ya-ember)}
.ya-hero__en{
    font-family:'Playfair Display',serif;font-style:italic;font-weight:400;
    font-size:clamp(1.1rem,2vw,1.6rem);color:var(--ya-lantern);
    margin-bottom:3rem;letter-spacing:.05em;
}
.ya-hero__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(2rem,5vw,4rem);align-items:end}
.ya-hero__lead{
    font-size:clamp(.95rem,1.2vw,1rem);line-height:2.2;color:var(--ya-ink-mid);max-width:min(480px,100%);
    border-left:2px solid var(--ya-ember);padding-left:clamp(1.2rem,2vw,1.6rem);
}
.ya-hero__image{
    border:1px solid var(--ya-lantern);padding:8px;background:var(--ya-bg-mid);position:relative;
}
.ya-hero__image::before{
    content:'';position:absolute;top:-20px;right:-20px;width:60px;height:60px;
    background:radial-gradient(circle,var(--ya-lantern),transparent 60%);
    filter:blur(15px);opacity:.7;
}
.ya-hero__image img{width:100%;aspect-ratio:4/3;object-fit:cover}

/* Section base */
.ya-sec{padding:clamp(4rem,8vw,7rem) 0;position:relative}
.ya-sec + .ya-sec{border-top:1px solid var(--ya-line)}
.ya-sec__label{
    font-family:'DM Mono',monospace;font-size:.78rem;letter-spacing:.3em;
    color:var(--ya-lantern);text-transform:uppercase;margin-bottom:1.2rem;
    display:flex;align-items:center;gap:1rem;
}
.ya-sec__label::before{content:'';width:40px;height:1px;background:var(--ya-lantern)}
.ya-sec__title{
    font-family:'Noto Serif JP',serif;font-weight:500;
    font-size:clamp(2rem,4.5vw,3.6rem);line-height:1.3;margin-bottom:2.5rem;letter-spacing:.02em;
}
.ya-sec__title em{font-style:normal;color:var(--ya-ember);font-weight:600}
.ya-sec__title .glow{color:var(--ya-lantern)}

/* OVERVIEW */
.ya-overview__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);gap:clamp(2.5rem,6vw,5rem);align-items:start}
.ya-overview__lead{font-size:clamp(1rem,1.3vw,1.15rem);line-height:2.2;color:var(--ya-ink);margin-bottom:2rem}
.ya-overview__body p{color:var(--ya-ink-mid);line-height:2.1;margin-bottom:1.4rem}
.ya-meta{border-top:1px solid var(--ya-line);margin-top:clamp(1.75rem,3.5vw,2.5rem)}
.ya-meta dl{
    display:grid;grid-template-columns:clamp(105px,13vw,130px) minmax(0,1fr);
    padding:1.2rem 0;border-bottom:1px solid var(--ya-line);
}
.ya-meta dt{font-family:'DM Mono',monospace;color:var(--ya-lantern);letter-spacing:.15em;text-transform:uppercase;font-size:.72rem}
.ya-meta dd{color:var(--ya-ink);line-height:1.7}

/* CHALLENGE */
.ya-challenge{background:var(--ya-night)}
.ya-challenge__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(2.5rem,6vw,5rem);align-items:center;position:relative}
.ya-challenge__grid::before{
    content:'';position:absolute;left:45%;top:-30px;bottom:-30px;width:500px;
    background:radial-gradient(ellipse at center,rgba(232,181,110,.08),transparent 60%);
    filter:blur(40px);pointer-events:none;
}
.ya-challenge__text{position:relative;z-index:1}
.ya-challenge__text p{color:var(--ya-ink-mid);line-height:2.1;margin-bottom:1.4rem}
.ya-challenge__text h3{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.4rem;margin-bottom:1rem;color:var(--ya-lantern)}

.ya-target{position:relative;z-index:1}
.ya-target__item{
    padding:2rem;background:rgba(246,239,224,.04);border-left:3px solid var(--ya-ember);
    margin-bottom:1.2rem;
}
.ya-target__label{
    font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.2em;
    color:var(--ya-lantern);text-transform:uppercase;margin-bottom:.6rem;
}
.ya-target__title{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.15rem;margin-bottom:.6rem;color:var(--ya-ink)}
.ya-target__desc{color:var(--ya-ink-mid);font-size:.95rem;line-height:1.95}

/* DESIGN */
.ya-design__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(2rem,5vw,4rem);align-items:start}
.ya-design__text h3{
    font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.3rem;
    margin-bottom:1rem;margin-top:2rem;color:var(--ya-lantern);
}
.ya-design__text h3:first-child{margin-top:0}
.ya-design__text p{color:var(--ya-ink-mid);line-height:2.1;margin-bottom:1.2rem}

.ya-palette{display:grid;grid-template-columns:repeat(2,1fr);gap:.6rem}
.ya-palette__item{
    padding:1.3rem;min-height:140px;
    display:flex;flex-direction:column;justify-content:space-between;
    font-family:'DM Mono',monospace;font-size:.78rem;letter-spacing:.08em;
}
.ya-palette__item span:first-child{font-family:'Noto Serif JP',serif;font-weight:500;font-size:.95rem;letter-spacing:.05em}
.ya-type{margin-top:2rem;border:1px solid var(--ya-line);padding:1.8rem}
.ya-type__label{font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.2em;color:var(--ya-lantern);text-transform:uppercase;margin-bottom:.8rem}
.ya-type__sample{font-family:'Noto Serif JP',serif;font-size:2rem;line-height:1.4}
.ya-type__sample--en{font-family:'Playfair Display',serif;font-style:italic;font-size:1.8rem;color:var(--ya-ember)}

/* WP */
.ya-wp{background:var(--ya-ember-dk);color:var(--ya-paper)}
.ya-wp .ya-sec__label{color:var(--ya-paper-dk)}
.ya-wp .ya-sec__label::before{background:var(--ya-paper-dk)}
.ya-wp .ya-sec__title{color:#fff}
.ya-wp__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:clamp(1rem,2vw,1.5rem);margin-top:clamp(2rem,4vw,3rem)}
.ya-wp__card{
    padding:clamp(1.5rem,2.5vw,2rem);background:rgba(0,0,0,.2);border:1px solid rgba(255,255,255,.12);
    border-top:3px solid var(--ya-lantern);
}
.ya-wp__num{font-family:'DM Mono',monospace;color:var(--ya-lantern);font-size:.85rem;letter-spacing:.15em;margin-bottom:.8rem}
.ya-wp__title{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.2rem;margin-bottom:.8rem;color:#fff}
.ya-wp__desc{color:rgba(255,255,255,.82);line-height:2;font-size:.95rem}

/* IMPLEMENTATION */
.ya-impl__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(1rem,2vw,1.5rem);margin-top:clamp(2rem,4vw,3rem)}
.ya-impl__card{
    padding:clamp(1.6rem,2.5vw,2.2rem);background:var(--ya-bg-mid);border:1px solid var(--ya-line);
    transition:.3s;display:grid;grid-template-columns:60px minmax(0,1fr);gap:1.4rem;
}
.ya-impl__card:hover{border-color:var(--ya-ember);transform:translateY(-4px)}
.ya-impl__num{
    font-family:'Playfair Display',serif;font-style:italic;
    font-size:2.2rem;color:var(--ya-lantern);line-height:1;
}
.ya-impl__title{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.15rem;margin-bottom:.7rem;color:var(--ya-ink)}
.ya-impl__desc{color:var(--ya-ink-mid);font-size:.93rem;line-height:2}

.ya-tech{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:clamp(2rem,4vw,3rem)}
.ya-tech__tag{
    padding:.55rem 1.1rem;border:1px solid var(--ya-lantern);color:var(--ya-lantern);
    font-family:'DM Mono',monospace;font-size:.78rem;letter-spacing:.1em;
}

/* LEARNING */
.ya-learning__list{margin-top:clamp(1.5rem,3vw,2rem)}
.ya-learning__item{
    display:grid;grid-template-columns:clamp(80px,12vw,120px) minmax(0,1fr);gap:clamp(1.5rem,3vw,3rem);
    padding:clamp(1.75rem,3vw,2.5rem) 0;border-bottom:1px solid var(--ya-line);align-items:start;
}
.ya-learning__num{font-family:'Playfair Display',serif;font-style:italic;font-weight:400;font-size:clamp(2.5rem,5vw,4rem);color:var(--ya-lantern);line-height:1}
.ya-learning__title{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.3rem;margin-bottom:1rem;color:var(--ya-ink)}
.ya-learning__desc{color:var(--ya-ink-mid);line-height:2.1}

/* CTA */
.ya-cta{text-align:center;padding:clamp(5rem,11vw,10rem) 0;position:relative;overflow:hidden}
.ya-cta::before{
    content:'灯';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
    font-family:'Noto Serif JP',serif;font-weight:900;font-size:28rem;
    color:rgba(232,181,110,.05);pointer-events:none;
}
.ya-cta__inner{position:relative;z-index:1}
.ya-cta__title{
    font-family:'Noto Serif JP',serif;font-weight:500;font-size:clamp(1.8rem,4vw,3rem);
    margin-bottom:2rem;line-height:1.5;
}
.ya-cta__title em{font-style:normal;color:var(--ya-ember);font-weight:600}
.ya-cta__buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}
.ya-btn{
    display:inline-flex;align-items:center;gap:.6rem;
    padding:1rem 2.4rem;font-family:'Noto Serif JP',serif;font-weight:500;font-size:.95rem;
    letter-spacing:.08em;transition:.3s;border:1px solid;
}
.ya-btn--primary{background:var(--ya-ember);color:#fff;border-color:var(--ya-ember)}
.ya-btn--primary:hover{background:var(--ya-bg);border-color:var(--ya-lantern);color:var(--ya-lantern)}
.ya-btn--outline{border-color:var(--ya-lantern);color:var(--ya-lantern)}
.ya-btn--outline:hover{background:var(--ya-lantern);color:var(--ya-bg)}

/* FOOTER */
.ya-foot{padding:clamp(2rem,4vw,3rem) 0;border-top:1px solid var(--ya-line);font-family:'DM Mono',monospace;font-size:.78rem;color:var(--ya-ink-lt)}
.ya-foot__row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;align-items:center}
.ya-foot__row a{color:var(--ya-ink-mid);transition:.3s}
.ya-foot__row a:hover{color:var(--ya-lantern)}

/* RESPONSIVE
   ※ ほとんどは auto-fit / clamp() で自動追従。レイアウト切替だけ定義 */
@media(max-width:767px){
    .ya-nav{grid-template-columns:auto 1fr auto}
    .ya-nav__center{display:none}
    .ya-overview__grid{grid-template-columns:1fr}
    .ya-learning__item{grid-template-columns:1fr;gap:1rem}
}

/* ============================================
   KPI Block (added for conversion signal)
============================================ */
.kpi-block {
  margin: clamp(2rem,4vw,3rem) auto;
  max-width: min(900px,100%);
  padding: clamp(1.75rem,3vw,2.5rem) clamp(1.25rem,2.5vw,1.75rem);
  background: #FFFDF8;
  border: 1px solid rgba(45,41,38,.12);
  border-left: 4px solid #D63426;
  border-radius: 6px;
}
.kpi-block__label {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  color: #D63426;
  letter-spacing: .08em;
  margin-bottom: .6rem;
}
.kpi-block__title {
  font-size: clamp(1.2rem,2vw,1.5rem);
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #2D2926;
}
.kpi-block__lead {
  font-size: .92rem;
  line-height: 1.9;
  color: #2D2926;
  opacity: .8;
  margin-bottom: 1.5rem;
}
.kpi-block__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(.75rem,1.5vw,1rem);
}
.kpi-item {
  padding: 1.1rem .85rem;
  background: #F2EFE9;
  border-radius: 4px;
  text-align: center;
}
.kpi-item__num {
  font-size: 1.5rem;
  font-weight: 700;
  color: #D63426;
  line-height: 1.2;
}
.kpi-item__label {
  font-size: .78rem;
  color: #2D2926;
  opacity: .75;
  margin-top: .4rem;
  line-height: 1.5;
}
.kpi-block__note {
  margin-top: 1.25rem;
  font-size: .72rem;
  color: #2D2926;
  opacity: .55;
  font-family: 'DM Mono', monospace;
  line-height: 1.7;
}
/* ※ kpi-block は auto-fit と clamp() で自動追従 */