/* ============================================
   case-study-kaze.css
   KAZE COFFEE — Brand Minimal · 2026
   ============================================ */
:root{
    --kz-bg:#F6F3EC;
    --kz-bg-dk:#EDE8DC;
    --kz-ink:#1F2A22;
    --kz-ink-mid:#3E4A40;
    --kz-ink-lt:#7A8278;
    --kz-accent:#5B7A54;
    --kz-accent-dk:#3E5838;
    --kz-line:rgba(31,42,34,.12);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
    background:var(--kz-bg);
    color:var(--kz-ink);
    font-family:'Noto Sans JP','Helvetica Neue',sans-serif;
    font-weight:300;
    line-height:1.8;
    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='0.03'/%3E%3C/svg%3E");
    opacity:.5
}

/* NAV */
.cs-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,1.1rem) clamp(1rem,3vw,2.5rem);
    background:rgba(246,243,236,.82);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--kz-line);
    font-family:'Space Grotesk','Noto Sans JP',sans-serif;
}
.cs-nav__logo{font-weight:700;letter-spacing:.02em;font-size:1.05rem}
.cs-nav__logo-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--kz-accent);margin-right:.5rem;vertical-align:middle}
.cs-nav__center{text-align:center;font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.22em;color:var(--kz-ink-lt);text-transform:uppercase}
.cs-nav__back{justify-self:end;font-family:'DM Mono',monospace;font-size:.78rem;letter-spacing:.15em;color:var(--kz-ink-mid);transition:.3s}
.cs-nav__back:hover{color:var(--kz-accent)}

/* Container */
.cs-wrap{max-width:1240px;margin:0 auto;padding:0 clamp(1rem,3vw,2rem)}

/* HERO */
.cs-hero{padding:clamp(7rem,13vw,11rem) 0 clamp(3.5rem,7vw,6rem);position:relative}
.cs-hero__meta{
    display:flex;align-items:center;gap:1rem;
    font-family:'DM Mono',monospace;font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;
    color:var(--kz-ink-lt);margin-bottom:2rem;
}
.cs-hero__meta span:first-child{color:var(--kz-accent);font-weight:500}
.cs-hero__divider{width:40px;height:1px;background:var(--kz-line)}
.cs-hero__title{
    font-family:'Noto Serif JP','Playfair Display',serif;
    font-weight:400;
    font-size:clamp(2.6rem,6vw,5.8rem);
    line-height:1.1;letter-spacing:-.01em;
    margin-bottom:1.8rem;
}
.cs-hero__title em{font-style:italic;color:var(--kz-accent);font-family:'Playfair Display',serif;font-weight:600}
.cs-hero__lead{
    max-width:min(680px,100%);font-size:clamp(.95rem,1.2vw,1.05rem);color:var(--kz-ink-mid);line-height:2;
    padding-left:clamp(1.2rem,2.5vw,2rem);border-left:2px solid var(--kz-accent);
    margin-top:clamp(2rem,4vw,3rem);
}
.cs-hero__tags{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:2.2rem}
.cs-hero__tag{
    padding:.4rem 1rem;border:1px solid var(--kz-ink);border-radius:99px;
    font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
}
.cs-hero__tag--fill{background:var(--kz-ink);color:var(--kz-bg)}

/* FV画像 */
.cs-hero__image{
    margin-top:clamp(2.5rem,5vw,4.5rem);border-radius:6px;overflow:hidden;
    box-shadow:0 40px 80px rgba(31,42,34,.18);
    position:relative;
}
.cs-hero__image::before{
    content:'01 / 05';position:absolute;top:1.2rem;left:1.2rem;z-index:2;
    font-family:'DM Mono',monospace;font-size:.7rem;letter-spacing:.15em;
    color:#fff;background:rgba(0,0,0,.4);padding:.3rem .8rem;border-radius:99px;
}
.cs-hero__image img{width:100%;aspect-ratio:16/9;object-fit:cover}

/* Section base */
.cs-sec{padding:clamp(4rem,8vw,7rem) 0;border-top:1px solid var(--kz-line)}
.cs-sec__label{
    font-family:'DM Mono',monospace;font-size:.78rem;letter-spacing:.25em;
    color:var(--kz-accent);text-transform:uppercase;margin-bottom:1.2rem;
}
.cs-sec__title{
    font-family:'Noto Serif JP',serif;font-weight:400;
    font-size:clamp(2rem,4vw,3.2rem);line-height:1.3;margin-bottom:2.5rem;
}
.cs-sec__title em{font-style:italic;color:var(--kz-accent)}

/* OVERVIEW */
.cs-overview__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(2rem,5vw,4rem);align-items:start}
.cs-overview__lead{font-size:clamp(1rem,1.3vw,1.15rem);line-height:2;color:var(--kz-ink);margin-bottom:2.2rem}
.cs-overview__body{color:var(--kz-ink-mid);line-height:2}
.cs-meta-table{border-top:1px solid var(--kz-line);margin-top:clamp(2rem,4vw,3rem)}
.cs-meta-table dl{
    display:grid;grid-template-columns:clamp(110px,14vw,140px) minmax(0,1fr);
    padding:1.2rem 0;border-bottom:1px solid var(--kz-line);
    font-family:'DM Mono',monospace;font-size:.85rem;
}
.cs-meta-table dt{color:var(--kz-ink-lt);letter-spacing:.1em;text-transform:uppercase;font-size:.72rem}
.cs-meta-table dd{color:var(--kz-ink);font-family:'Noto Sans JP',sans-serif;line-height:1.7}

/* CONCEPT */
.cs-concept{background:var(--kz-bg-dk)}
.cs-concept__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(2.5rem,6vw,5rem);align-items:center}
.cs-concept__text h3{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.6rem;margin-bottom:1rem;line-height:1.5}
.cs-concept__text p{color:var(--kz-ink-mid);line-height:2;margin-bottom:1.2rem}
.cs-concept__list{list-style:none;margin-top:2rem}
.cs-concept__list li{
    padding:1rem 0;border-bottom:1px dashed var(--kz-line);
    display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:center;
}
.cs-concept__list li::before{
    content:'';width:8px;height:8px;border-radius:50%;background:var(--kz-accent);
}

/* カラーパレット表示 */
.cs-palette{display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem}
.cs-palette__item{
    padding:1.2rem;border-radius:4px;color:#fff;
    font-family:'DM Mono',monospace;font-size:.8rem;min-height:130px;
    display:flex;flex-direction:column;justify-content:space-between;
}
.cs-palette__item span:last-child{font-weight:600;letter-spacing:.05em}

/* TYPOGRAPHY サンプル */
.cs-type{margin-top:3rem}
.cs-type__sample{
    padding:2rem;background:var(--kz-bg);border:1px solid var(--kz-line);
    border-radius:4px;margin-bottom:1rem;
}
.cs-type__label{font-family:'DM Mono',monospace;font-size:.7rem;letter-spacing:.15em;color:var(--kz-ink-lt);text-transform:uppercase;margin-bottom:.6rem}
.cs-type__ja{font-family:'Noto Serif JP',serif;font-size:2rem;font-weight:400}
.cs-type__en{font-family:'Playfair Display',serif;font-style:italic;font-size:2rem;color:var(--kz-accent)}

/* IMPLEMENTATION */
.cs-impl__list{
    display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:clamp(1.25rem,2.5vw,2rem);margin-top:clamp(2rem,4vw,3rem);
}
.cs-impl__item{
    padding:clamp(1.5rem,2.5vw,2rem);background:var(--kz-bg-dk);border-radius:6px;
    border-left:3px solid var(--kz-accent);
}
.cs-impl__num{font-family:'DM Mono',monospace;color:var(--kz-accent);font-size:.85rem;letter-spacing:.1em;margin-bottom:.8rem}
.cs-impl__title{font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.15rem;margin-bottom:.8rem}
.cs-impl__desc{color:var(--kz-ink-mid);font-size:.95rem;line-height:1.9}

.cs-tech{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:clamp(2rem,4vw,3rem)}
.cs-tech__tag{
    padding:.5rem 1rem;background:var(--kz-bg);border:1px solid var(--kz-line);
    border-radius:4px;font-family:'DM Mono',monospace;font-size:.8rem;
}

/* LEARNING */
.cs-learning{background:var(--kz-ink);color:var(--kz-bg)}
.cs-learning .cs-sec__label{color:#C4D5BD}
.cs-learning .cs-sec__title{color:var(--kz-bg)}
.cs-learning__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(2rem,4vw,3rem)}
.cs-learning__item h3{
    font-family:'Noto Serif JP',serif;font-weight:500;font-size:1.3rem;
    color:#fff;margin-bottom:1rem;
}
.cs-learning__item p{color:rgba(246,243,236,.75);line-height:2}
.cs-learning__num{
    display:inline-block;font-family:'Playfair Display',serif;font-style:italic;
    font-size:3rem;color:#C4D5BD;line-height:1;margin-bottom:1rem;
}

/* CTA */
.cs-cta{text-align:center;padding:clamp(4.5rem,10vw,9rem) 0}
.cs-cta__title{
    font-family:'Noto Serif JP',serif;font-weight:400;font-size:clamp(1.8rem,3.5vw,2.8rem);
    margin-bottom:2rem;line-height:1.5;
}
.cs-cta__title em{font-style:italic;color:var(--kz-accent)}
.cs-cta__buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}
.cs-btn{
    display:inline-flex;align-items:center;gap:.6rem;
    padding:1rem 2.2rem;border-radius:99px;
    font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:.95rem;
    transition:.3s;
}
.cs-btn--primary{background:var(--kz-accent);color:#fff}
.cs-btn--primary:hover{background:var(--kz-accent-dk);transform:translateY(-2px)}
.cs-btn--outline{border:1px solid var(--kz-ink);color:var(--kz-ink)}
.cs-btn--outline:hover{background:var(--kz-ink);color:var(--kz-bg)}

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

/* 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){
    .cs-nav{grid-template-columns:auto 1fr auto}
    .cs-nav__center{display:none}
    .cs-overview__grid{grid-template-columns:1fr}
}

/* ============================================
   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: .78rem;
  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: .78rem;
  color: #2D2926;
  opacity: .75;
  font-family: 'DM Mono', monospace;
  line-height: 1.7;
}
/* ※ kpi-block は auto-fit と clamp() で自動追従 */