/* ============================================
   case-study-juku.css
   Juku / School LP — Trustworthy Academic · 2026
   ============================================ */
:root{
    --jk-bg:#FAF9F4;
    --jk-bg-mid:#F0EEE4;
    --jk-ink:#1A2E26;
    --jk-ink-mid:#3D5348;
    --jk-ink-lt:#76887E;
    --jk-teal:#1A3828;
    --jk-teal-lt:#5BAD92;
    --jk-yellow:#F4C430;
    --jk-line:rgba(26,46,38,.14);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
    background:var(--jk-bg);
    color:var(--jk-ink);
    font-family:'Noto Sans JP',sans-serif;
    font-weight:400;
    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='0.025'/%3E%3C/svg%3E");
    opacity:.5
}

/* NAV */
.jk-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(250,249,244,.88);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--jk-line);
}
.jk-nav__logo{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.1rem}
.jk-nav__logo-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--jk-yellow);margin-right:.5rem;vertical-align:middle}
.jk-nav__center{text-align:center;font-family:'DM Mono',monospace;font-size:.72rem;letter-spacing:.22em;color:var(--jk-ink-lt);text-transform:uppercase}
.jk-nav__back{justify-self:end;font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:.9rem;color:var(--jk-ink-mid);transition:.3s}
.jk-nav__back:hover{color:var(--jk-teal-lt)}

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

/* HERO */
.jk-hero{padding:clamp(7rem,12vw,10rem) 0 clamp(3rem,6vw,5rem);position:relative;overflow:hidden}
.jk-hero__bg{
    position:absolute;top:-100px;right:-100px;
    width:500px;height:500px;border-radius:50%;
    background:radial-gradient(circle,rgba(244,196,48,.15),transparent 70%);
    z-index:0;
}
.jk-hero__inner{position:relative;z-index:1}
.jk-hero__pill{
    display:inline-flex;align-items:center;gap:.5rem;
    padding:.5rem 1.2rem;background:var(--jk-yellow);color:var(--jk-ink);
    font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:.78rem;
    letter-spacing:.12em;text-transform:uppercase;border-radius:99px;margin-bottom:2rem;
}
.jk-hero__pill::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--jk-teal)}
.jk-hero__title{
    font-family:'Noto Sans JP',sans-serif;font-weight:800;
    font-size:clamp(2.6rem,6vw,5.4rem);
    line-height:1.25;letter-spacing:-.01em;margin-bottom:2rem;color:var(--jk-teal);
}
.jk-hero__title .accent{
    background:linear-gradient(transparent 70%,rgba(244,196,48,.55) 70%);
    padding:0 .1em;
}
.jk-hero__title .en{
    font-family:'Space Grotesk',sans-serif;font-weight:500;font-size:.4em;
    display:block;color:var(--jk-teal-lt);letter-spacing:.1em;margin-top:1rem;
}
.jk-hero__lead{
    max-width:min(680px,100%);font-size:clamp(.95rem,1.2vw,1.05rem);line-height:2;color:var(--jk-ink-mid);
    padding:clamp(1.3rem,2.5vw,1.8rem) clamp(1.3rem,2.5vw,2rem);background:rgba(91,173,146,.08);border-left:4px solid var(--jk-teal-lt);
    margin-top:clamp(1.8rem,3vw,2.5rem);border-radius:0 6px 6px 0;
}
.jk-hero__image{
    margin-top:clamp(3rem,6vw,5rem);position:relative;border-radius:12px;overflow:hidden;
    box-shadow:0 30px 60px rgba(26,56,40,.2);
}
.jk-hero__image-inner{
    aspect-ratio:8/5;
    background:linear-gradient(135deg,#1A3828 0%,#5BAD92 100%);
    display:flex;align-items:center;justify-content:center;
    position:relative;overflow:hidden;
}
.jk-hero__image-inner img{width:100%;height:100%;object-fit:cover;object-position:top;display:block}
.jk-hero__image-inner::after{
    content:'';position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(26,56,40,.04),rgba(26,56,40,.22));
}
.jk-hero__image-text{
    font-family:'Space Grotesk',sans-serif;font-weight:800;
    font-size:clamp(3rem,6vw,5.5rem);color:rgba(250,249,244,.9);
    letter-spacing:.02em;z-index:1;position:relative;text-align:center;line-height:1.1;
}
.jk-hero__image-text span{
    display:block;font-size:.35em;font-weight:500;letter-spacing:.2em;
    color:var(--jk-yellow);margin-top:.6rem;
}
.jk-hero__caption{
    margin:0;padding:.75rem 1rem;background:var(--jk-teal);color:rgba(255,255,255,.88);
    font-size:.78rem;line-height:1.7;text-align:center;letter-spacing:.03em;
}

/* Section base */
.jk-sec{padding:clamp(4rem,8vw,7rem) 0;position:relative}
.jk-sec__label{
    display:inline-flex;align-items:center;gap:.6rem;
    font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:.78rem;
    letter-spacing:.18em;text-transform:uppercase;color:var(--jk-teal-lt);
    margin-bottom:1.2rem;
}
.jk-sec__label::before{content:'';width:30px;height:2px;background:var(--jk-teal-lt)}
.jk-sec__title{
    font-family:'Noto Sans JP',sans-serif;font-weight:800;color:var(--jk-teal);
    font-size:clamp(2rem,4vw,3.2rem);line-height:1.4;margin-bottom:2rem;
}
.jk-sec__title .accent{
    background:linear-gradient(transparent 70%,rgba(244,196,48,.55) 70%);
    padding:0 .1em;
}

/* OVERVIEW */
.jk-overview__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:clamp(2rem,5vw,4rem);align-items:start}
.jk-overview__lead{font-size:1.15rem;line-height:2;color:var(--jk-ink);margin-bottom:2rem;font-weight:500}
.jk-overview__body p{color:var(--jk-ink-mid);line-height:2;margin-bottom:1.3rem}

.jk-meta{
    background:#fff;border-radius:12px;padding:clamp(1.5rem,2.5vw,2rem);
    box-shadow:0 4px 20px rgba(26,56,40,.08);
    border-top:4px solid var(--jk-yellow);
}
.jk-meta dl{
    display:grid;grid-template-columns:clamp(90px,12vw,110px) minmax(0,1fr);
    padding:.9rem 0;border-bottom:1px dashed var(--jk-line);
}
.jk-meta dl:last-child{border-bottom:none}
.jk-meta dt{font-family:'Space Grotesk',sans-serif;font-weight:700;color:var(--jk-teal);font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;padding-top:.2rem}
.jk-meta dd{color:var(--jk-ink);line-height:1.7;font-size:.95rem}

/* PERSONA */
.jk-persona{background:var(--jk-teal);color:#fff;border-radius:0;margin:0}
.jk-persona .jk-sec__label{color:var(--jk-yellow)}
.jk-persona .jk-sec__label::before{background:var(--jk-yellow)}
.jk-persona .jk-sec__title{color:#fff}
.jk-persona__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(1.5rem,3vw,2.5rem);margin-top:clamp(2rem,4vw,3rem)}
.jk-persona__card{
    padding:clamp(1.75rem,3vw,2.5rem);background:rgba(255,255,255,.06);border-radius:12px;
    border:1px solid rgba(255,255,255,.1);
}
.jk-persona__title{font-size:.85rem;letter-spacing:.15em;color:var(--jk-yellow);margin-bottom:.6rem;font-family:'Space Grotesk',sans-serif;font-weight:700;text-transform:uppercase}
.jk-persona__name{font-family:'Noto Sans JP',sans-serif;font-weight:700;font-size:1.4rem;margin-bottom:1rem;color:#fff}
.jk-persona__desc{color:rgba(255,255,255,.8);line-height:2}
.jk-persona__need{
    margin-top:1.5rem;padding-top:1.5rem;border-top:1px dashed rgba(255,255,255,.2);
}
.jk-persona__need-label{font-family:'Space Grotesk',sans-serif;font-weight:700;color:var(--jk-yellow);font-size:.75rem;letter-spacing:.1em;margin-bottom:.5rem;text-transform:uppercase}
.jk-persona__need-text{color:#fff;line-height:1.9}

/* CONCEPT */
.jk-concept__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:clamp(2rem,5vw,4rem);align-items:center}
.jk-concept__text p{color:var(--jk-ink-mid);line-height:2.1;margin-bottom:1.2rem}
.jk-concept__text h3{font-family:'Noto Sans JP',sans-serif;font-weight:700;font-size:1.3rem;margin-bottom:1rem;margin-top:2rem;color:var(--jk-teal)}
.jk-concept__text h3:first-child{margin-top:0}

.jk-palette{display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem}
.jk-palette__item{
    padding:1.5rem;border-radius:12px;aspect-ratio:1.3;
    display:flex;flex-direction:column;justify-content:space-between;
    font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:.95rem;
}
.jk-palette__item span:last-child{font-family:'DM Mono',monospace;font-size:.75rem;font-weight:400;letter-spacing:.05em}

.jk-type{margin-top:2rem;padding:2rem;background:#fff;border-radius:12px;border:1px solid var(--jk-line)}
.jk-type__label{font-family:'Space Grotesk',sans-serif;font-weight:700;color:var(--jk-teal-lt);font-size:.72rem;letter-spacing:.15em;text-transform:uppercase;margin-bottom:.8rem}
.jk-type__sample{font-family:'Noto Sans JP',sans-serif;font-weight:800;font-size:1.8rem;line-height:1.4;color:var(--jk-teal)}

/* STRUCTURE */
.jk-structure{background:var(--jk-bg-mid)}
.jk-structure__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:clamp(1rem,2vw,1.5rem);margin-top:clamp(2rem,4vw,3rem)}
.jk-structure__card{
    padding:clamp(1.6rem,2.5vw,2.2rem);background:#fff;border-radius:12px;
    border-top:4px solid var(--jk-teal-lt);position:relative;
    transition:.3s;
}
.jk-structure__card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(26,56,40,.1)}
.jk-structure__num{font-family:'Space Grotesk',sans-serif;font-weight:800;font-size:2rem;color:var(--jk-yellow);line-height:1}
.jk-structure__title{font-family:'Noto Sans JP',sans-serif;font-weight:700;font-size:1.15rem;margin:1rem 0 .8rem;color:var(--jk-teal)}
.jk-structure__desc{color:var(--jk-ink-mid);font-size:.93rem;line-height:1.9}

/* IMPLEMENTATION */
.jk-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)}
.jk-impl__card{
    padding:clamp(1.5rem,2.5vw,2rem);background:#fff;border-radius:10px;
    border:1px solid var(--jk-line);display:grid;grid-template-columns:50px minmax(0,1fr);gap:1.2rem;
}
.jk-impl__icon{
    width:50px;height:50px;background:var(--jk-teal-lt);color:#fff;
    border-radius:12px;display:flex;align-items:center;justify-content:center;
    font-family:'Space Grotesk',sans-serif;font-weight:800;font-size:1.2rem;
}
.jk-impl__title{font-family:'Noto Sans JP',sans-serif;font-weight:700;font-size:1.1rem;margin-bottom:.5rem;color:var(--jk-teal)}
.jk-impl__desc{color:var(--jk-ink-mid);font-size:.92rem;line-height:1.9}

.jk-tech{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:clamp(2rem,4vw,3rem)}
.jk-tech__tag{
    padding:.55rem 1.2rem;background:var(--jk-teal);color:#fff;
    font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:.8rem;
    letter-spacing:.05em;border-radius:99px;
}

/* LEARNING */
.jk-learning__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(1.25rem,2.5vw,2rem);margin-top:clamp(1.5rem,3vw,2rem)}
.jk-learning__item{
    padding:clamp(1.75rem,3vw,2.5rem);background:#fff;border-radius:12px;
    border:1px solid var(--jk-line);
}
.jk-learning__num{
    display:inline-block;
    font-family:'Space Grotesk',sans-serif;font-weight:800;font-size:1.8rem;color:var(--jk-yellow);
    line-height:1;margin-bottom:1rem;
}
.jk-learning__title{font-family:'Noto Sans JP',sans-serif;font-weight:700;font-size:1.2rem;margin-bottom:.8rem;color:var(--jk-teal)}
.jk-learning__desc{color:var(--jk-ink-mid);line-height:2}

/* CTA */
.jk-cta{text-align:center;padding:clamp(4rem,9vw,8rem) 0;background:var(--jk-teal);color:#fff;border-radius:0}
.jk-cta__title{
    font-family:'Noto Sans JP',sans-serif;font-weight:800;color:#fff;
    font-size:clamp(1.8rem,4vw,3rem);line-height:1.4;margin-bottom:2rem;
}
.jk-cta__title .accent{
    background:linear-gradient(transparent 70%,rgba(244,196,48,.55) 70%);
    padding:0 .1em;
}
.jk-cta__sub{color:rgba(255,255,255,.75);max-width:520px;margin:0 auto 2.5rem}
.jk-cta__buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.jk-btn{
    display:inline-flex;align-items:center;gap:.6rem;
    padding:1rem 2.2rem;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:.95rem;
    transition:.3s;border-radius:99px;
}
.jk-btn--primary{background:var(--jk-yellow);color:var(--jk-teal)}
.jk-btn--primary:hover{background:#fff;transform:translateY(-2px)}
.jk-btn--outline{border:2px solid rgba(255,255,255,.4);color:#fff}
.jk-btn--outline:hover{background:rgba(255,255,255,.1);border-color:#fff}

/* FOOTER */
.jk-foot{padding:clamp(2rem,4vw,3rem) 0;border-top:1px solid var(--jk-line);font-family:'Space Grotesk',sans-serif;font-size:.85rem;color:var(--jk-ink-lt)}
.jk-foot__row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem}
.jk-foot__row a{color:var(--jk-ink-mid);transition:.3s}
.jk-foot__row a:hover{color:var(--jk-teal-lt)}

/* 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){
    .jk-nav{grid-template-columns:auto 1fr auto}
    .jk-nav__center{display:none}
    .jk-overview__grid{grid-template-columns:1fr}
    .jk-persona{margin-left:0;margin-right:0}
}

/* ============================================
   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 */