:root{
  --color-base:#313131;
  --color-base-soft:#4A4A4A;
  --color-base-mute:#8A8A8A;
  --color-accent:#0B8A80;
  --color-accent-hover:#14998A;
  --color-accent-dark:#076E66;
  --color-accent-soft:#E2F2EF;
  --color-bg:#FFFFFF;
  --color-bg-alt:#F7FAF9;
  --color-line:#E5E5E5;
  --color-line-soft:#EFEFEF;
  --color-mute:#6B7775;
  --font-sans:"Noto Sans JP",-apple-system,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;
  --font-serif:"Noto Serif JP","Hiragino Mincho ProN","Yu Mincho",serif;
  --maxw:1100px;
  --radius:6px;
  --space-section:clamp(4rem,3rem + 4vw,7rem);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{overflow-x:hidden}
body{margin:0;background:var(--color-bg);color:var(--color-base);font-family:var(--font-sans);font-size:16px;line-height:1.8;font-feature-settings:"palt";-webkit-font-smoothing:antialiased}

.high-lp{overflow-x:hidden}
.high-lp .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.high-lp a{color:inherit;text-decoration:none}
.high-lp img{max-width:100%;display:block}

/* ───── shared ───── */
.high-lp section{padding:var(--space-section) 0}
.high-lp .h2{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:clamp(1.6rem,1.2rem + 1.6vw,2.4rem);
  line-height:1.4;
  letter-spacing:.02em;
  margin:0 0 .9rem;
}
.high-lp .h2::after{
  content:"";
  display:block;
  width:56px;height:3px;
  background:var(--color-accent);
  margin-top:1.1rem;
}
.high-lp .lead{
  font-size:clamp(1rem,.95rem + .2vw,1.125rem);
  color:var(--color-base);
  margin:1.6rem 0 0;
  max-width:48em;
  text-wrap:pretty;
}
.high-lp .note{
  font-size:.85rem;
  color:var(--color-mute);
  margin-top:1.5rem;
  line-height:1.7;
}
.high-lp .section-num{
  font-family:var(--font-serif);
  font-size:.74rem;letter-spacing:.32em;
  color:var(--color-accent);
  font-weight:700;
  margin:0 0 1rem;
  display:flex;align-items:center;gap:14px;
}
.high-lp .section-num::before{
  content:"";display:inline-block;
  width:24px;height:1px;background:var(--color-accent);
}

/* ───── header ───── */
.lp-chrome{
  border-bottom:1px solid var(--color-line);
  background:var(--color-bg);
  position:sticky;top:0;z-index:50;
}
.lp-chrome__inner{
  max-width:var(--maxw);margin:0 auto;
  padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.lp-brand{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:1.1rem;
  letter-spacing:.04em;
}
.lp-brand small{
  display:block;
  font-family:var(--font-sans);
  font-weight:400;
  font-size:.7rem;
  color:var(--color-mute);
  letter-spacing:.1em;
  margin-top:2px;
}
.lp-nav{display:flex;gap:24px;font-size:.88rem}
.lp-nav a{color:var(--color-mute);min-height:48px;display:inline-flex;align-items:center}
@media (hover:hover){
  .lp-nav a:hover{color:var(--color-accent)}
}
@media (max-width:720px){
  .lp-nav{display:none}
}

/* ───── breadcrumb ───── */
.crumb{
  font-size:.78rem;
  color:var(--color-mute);
  padding:18px 0 0;
}
.crumb a{color:var(--color-mute);border-bottom:1px solid transparent}
@media (hover:hover){.crumb a:hover{color:var(--color-accent);border-bottom-color:currentColor}}
.crumb span[aria-current]{color:var(--color-base)}

/* ───── hero ───── */
.hero{
  padding-top:clamp(2.5rem,2rem + 3vw,5rem);
  padding-bottom:clamp(3rem,2rem + 4vw,6rem);
  position:relative;
}
.hero__grid{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:clamp(2rem,1rem + 4vw,5rem);
  align-items:center;
}
.hero__h1{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:clamp(2.4rem,1.6rem + 4vw,4.4rem);
  line-height:1.15;
  letter-spacing:.04em;
  margin:0;
}
.hero__h1 .ruby{
  display:block;
  font-family:var(--font-sans);
  font-size:.78rem;
  color:var(--color-accent);
  letter-spacing:.32em;
  font-weight:700;
  margin-bottom:1.4rem;
}
.hero__rule{
  width:56px;height:3px;background:var(--color-accent);
  margin:1.8rem 0 1.4rem;
}
.hero__copy{
  font-family:var(--font-serif);
  font-size:clamp(1.05rem,.95rem + .5vw,1.35rem);
  font-weight:500;
  line-height:1.85;
  margin:0 0 1.4rem;
  text-wrap:pretty;
}
.hero__sub{
  display:flex;flex-wrap:wrap;gap:8px;
  font-size:.8rem;color:var(--color-mute);
  margin:0;
  list-style:none;padding:0;
}
.hero__sub li{
  border:1px solid var(--color-line);
  padding:6px 12px;border-radius:999px;
  background:#fff;
}

/* hero diagram — 4 parallel tracks */
.tracks{
  position:relative;
  width:100%;
  max-width:440px;
  margin-left:auto;
  aspect-ratio: 1 / 1;
}
.tracks__svg{width:100%;height:100%;display:block}
.tracks__legend{
  position:absolute;
  inset:auto 0 -8px 0;
  display:flex;justify-content:space-between;
  font-size:.62rem;
  letter-spacing:.16em;
  color:var(--color-mute);
  font-weight:500;
}
.tracks__legend span{flex:1;text-align:center}

@media (max-width:880px){
  .hero__grid{grid-template-columns:1fr;gap:2.5rem}
  .tracks{margin:0 auto;max-width:340px}
}

/* ───── section: 4軌道 ───── */
.tracks-sec{background:var(--color-bg-alt);border-top:1px solid var(--color-line);border-bottom:1px solid var(--color-line)}
.tracks-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
  margin-top:3rem;
}
.track-card{
  background:#fff;
  border:1px solid var(--color-line);
  border-left:3px solid var(--color-accent);
  border-radius:var(--radius);
  padding:32px 28px;
  display:flex;flex-direction:column;gap:14px;
  min-height:48px;
  transition:box-shadow .2s ease, transform .2s ease;
  position:relative;
}
.track-card.is-link{cursor:pointer}
@media (hover:hover){
  .track-card.is-link:hover{box-shadow:0 12px 32px -16px rgba(11,138,128,.25);transform:translateY(-2px)}
  .track-card.is-link:hover .track-card__more{color:var(--color-accent-dark)}
}
.track-card__head{
  display:flex;align-items:baseline;justify-content:space-between;gap:12px;
}
.track-card__num{
  font-family:var(--font-serif);
  font-size:.74rem;letter-spacing:.24em;
  color:var(--color-accent);
  font-weight:700;
}
.track-card__weight{
  font-size:.7rem;
  letter-spacing:.16em;
  color:var(--color-base-mute);
  font-weight:500;
}
.track-card__title{
  font-family:var(--font-serif);
  font-size:1.5rem;
  font-weight:700;
  margin:0;
  letter-spacing:.04em;
  line-height:1.4;
}
.track-card__title small{
  display:block;
  font-family:var(--font-sans);
  font-size:.72rem;
  font-weight:500;
  color:var(--color-mute);
  letter-spacing:.18em;
  margin-bottom:4px;
}
.track-card__desc{
  margin:0;
  font-size:.95rem;
  line-height:1.95;
  color:var(--color-base-soft);
  text-wrap:pretty;
}
.track-card__more{
  margin-top:auto;
  padding-top:14px;
  border-top:1px dashed var(--color-line);
  font-size:.82rem;
  color:var(--color-accent);
  font-weight:700;
  letter-spacing:.06em;
  display:inline-flex;align-items:center;gap:8px;
}
.track-card__more::after{
  content:"";display:inline-block;width:16px;height:1px;background:currentColor;
  position:relative;
}

@media (max-width:599px){
  .tracks-grid{grid-template-columns:1fr;gap:14px}
  .track-card{padding:24px 22px}
}

/* ───── section: 学年別 ───── */
.grades-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  margin-top:3rem;
  border-top:1px solid var(--color-line);
  border-left:1px solid var(--color-line);
}
.grade{
  background:#fff;
  padding:32px 24px;
  display:flex;flex-direction:column;gap:14px;
  border-right:1px solid var(--color-line);
  border-bottom:1px solid var(--color-line);
  position:relative;
}
.grade__no{
  font-family:var(--font-serif);
  font-size:.72rem;letter-spacing:.32em;
  color:var(--color-accent);
  font-weight:700;
}
.grade__title{
  font-family:var(--font-serif);
  font-size:1.4rem;
  font-weight:700;
  margin:0;
  letter-spacing:.04em;
  line-height:1.3;
}
.grade__title b{
  display:block;
  font-size:2.4rem;
  letter-spacing:.04em;
  font-weight:700;
  color:var(--color-base);
  line-height:1;
  margin-bottom:8px;
}
.grade__sub{
  font-family:var(--font-sans);
  font-size:.7rem;letter-spacing:.18em;
  color:var(--color-mute);
  font-weight:500;
}
.grade__focus{
  font-family:var(--font-serif);
  font-size:1rem;
  font-weight:700;
  color:var(--color-accent);
  margin:0;
  letter-spacing:.04em;
  line-height:1.5;
}
.grade__desc{
  font-size:.88rem;
  color:var(--color-base-soft);
  margin:0;line-height:1.85;
}

@media (max-width:1099px){
  .grades-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:599px){
  .grades-grid{grid-template-columns:1fr}
}

/* ───── section: 講師 ───── */
.faculty-sec{background:var(--color-bg-alt);border-top:1px solid var(--color-line);border-bottom:1px solid var(--color-line)}
.faculty-list{
  margin-top:3rem;
  display:flex;flex-direction:column;
  border-top:1px solid var(--color-line);
}
.faculty-row{
  display:grid;
  grid-template-columns:minmax(180px,.9fr) 1fr;
  gap:32px;
  padding:28px 0;
  border-bottom:1px solid var(--color-line);
  align-items:start;
}
.faculty-row__subj{
  font-family:var(--font-serif);
  margin:0;
}
.faculty-row__subj b{
  display:block;
  font-size:1.35rem;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.4;
}
.faculty-row__subj small{
  display:block;
  font-family:var(--font-sans);
  font-size:.7rem;letter-spacing:.2em;
  color:var(--color-accent);
  font-weight:700;
  margin-bottom:6px;
}
.faculty-row__names{
  display:flex;flex-wrap:wrap;gap:8px;
  margin:0;padding:0;list-style:none;
}
.faculty-row__names li{
  background:#fff;
  border:1px solid var(--color-line);
  padding:8px 16px;
  font-family:var(--font-serif);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.04em;
  color:var(--color-base);
  border-radius:3px;
  min-height:40px;
  display:inline-flex;align-items:center;
}
.faculty-row__names li.is-lead{
  background:var(--color-accent-soft);
  border-color:var(--color-accent);
  color:var(--color-accent-dark);
}
.faculty-row__names li small{
  font-family:var(--font-sans);
  font-weight:500;
  font-size:.68rem;
  letter-spacing:.14em;
  margin-left:8px;
  color:var(--color-mute);
}
.faculty-row__names li.is-lead small{color:var(--color-accent-dark)}

@media (max-width:720px){
  .faculty-row{grid-template-columns:1fr;gap:14px;padding:22px 0}
  .faculty-row__subj b{font-size:1.2rem}
}

/* ───── section: 月謝 ───── */
.fee-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
  margin-top:3rem;
}
.fee-card{
  background:#fff;
  border:1px solid var(--color-line);
  border-radius:var(--radius);
  padding:32px 28px;
  display:flex;flex-direction:column;gap:14px;
}
.fee-card__head{
  display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  border-bottom:1px solid var(--color-line);
  padding-bottom:14px;
}
.fee-card__name{
  font-family:var(--font-serif);
  font-size:1.4rem;
  font-weight:700;
  margin:0;
  letter-spacing:.06em;
}
.fee-card__name small{
  display:block;
  font-family:var(--font-sans);
  font-size:.7rem;letter-spacing:.18em;
  color:var(--color-mute);
  font-weight:500;
  margin-bottom:4px;
}
.fee-card__tag{
  font-size:.7rem;
  letter-spacing:.16em;
  color:var(--color-base-mute);
  font-weight:500;
  white-space:nowrap;
}
.fee-card__amount{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:1.3rem;
  color:var(--color-accent);
  letter-spacing:.02em;
  line-height:1.4;
}
.fee-card__amount span{
  font-size:.78rem;font-weight:400;color:var(--color-mute);
  font-family:var(--font-sans);
  margin-left:6px;
  letter-spacing:.06em;
}
.fee-card__bar{
  position:relative;
  height:6px;
  background:var(--color-line-soft);
  border-radius:3px;
  overflow:hidden;
}
.fee-card__bar > i{
  position:absolute;left:0;top:0;bottom:0;
  background:var(--color-accent);
  border-radius:3px;
}
.fee-card__hint{
  margin:0;
  font-size:.85rem;
  color:var(--color-base-soft);
  line-height:1.8;
}

.fee-sec{background:var(--color-bg-alt);border-top:1px solid var(--color-line);border-bottom:1px solid var(--color-line)}

@media (max-width:599px){
  .fee-grid{grid-template-columns:1fr;gap:14px}
  .fee-card{padding:24px 22px}
}

/* ───── FAQ Accordion (details/summary) ───── */
.faq-acc{
  max-width:820px;
  margin:3rem auto 0;
  border-top:1px solid var(--color-line);
}
.faq-acc__item{
  border-bottom:1px solid var(--color-line);
  background:var(--color-bg);
}
.faq-acc__item[open]{
  background:var(--color-bg-alt);
}
.faq-acc__q{
  display:grid;
  grid-template-columns:32px 1fr 24px;
  gap:16px;
  align-items:center;
  padding:22px 28px;
  cursor:pointer;
  list-style:none;
  font-family:var(--font-serif);
  font-weight:700;
  font-size:1.02rem;
  line-height:1.6;
  color:var(--color-base);
  letter-spacing:.02em;
  transition:background .15s ease;
  user-select:none;
}
.faq-acc__q::-webkit-details-marker{display:none}
.faq-acc__q::marker{display:none}
@media (hover:hover){
  .faq-acc__q:hover{background:var(--color-bg-alt)}
}
.faq-acc__q:focus-visible{
  outline:2px solid var(--color-accent);
  outline-offset:-2px;
}
.faq-acc__q-mark{
  font-family:var(--font-serif);
  font-size:1.1rem;
  font-weight:700;
  color:var(--color-accent);
  line-height:1.55;
}
.faq-acc__q-text{text-wrap:pretty}
.faq-acc__caret{
  font-size:.9rem;
  color:var(--color-base-mute);
  transition:transform .2s ease;
  text-align:center;
  line-height:1;
}
.faq-acc__item[open] .faq-acc__caret{
  transform:rotate(180deg);
}
.faq-acc__a{
  display:grid;
  grid-template-columns:32px 1fr;
  gap:16px;
  align-items:start;
  padding:0 28px 24px;
}
.faq-acc__a-mark{
  font-family:var(--font-serif);
  font-size:1.1rem;
  font-weight:700;
  color:var(--color-base-mute);
  line-height:1.55;
}
.faq-acc__a p{
  color:var(--color-base-soft);
  font-size:.95rem;
  line-height:1.95;
  margin:0;
  text-wrap:pretty;
}
@media (max-width:599px){
  .faq-acc__q,.faq-acc__a{padding-left:22px;padding-right:22px}
  .faq-acc__q{
    grid-template-columns:28px 1fr 20px;
    gap:12px;
    font-size:.96rem;
  }
  .faq-acc__a{
    grid-template-columns:28px 1fr;
    gap:12px;
  }
}

/* ───── CTA section ───── */
.cta-sec{background:var(--color-base);color:#fff;position:relative;overflow:hidden}
.cta-sec::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(ellipse 60% 40% at 80% 30%, rgba(11,138,128,.18), transparent 70%);
  pointer-events:none;
}
.cta-sec .h2{color:#fff}
.cta-sec .h2::after{background:var(--color-accent)}
.cta-sec .lead{color:rgba(255,255,255,.78)}
.cta-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:48px;
  align-items:end;
  margin-top:2.5rem;
  position:relative;
}
.cta-meta{
  font-size:.82rem;color:rgba(255,255,255,.55);
  margin-top:1.4rem;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:14px;
  min-height:60px;
  padding:18px 36px;
  background:var(--color-accent);
  color:#fff;
  font-family:var(--font-sans);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.08em;
  border-radius:3px;
  border:1px solid var(--color-accent);
  transition:background .15s ease, border-color .15s ease;
  white-space:nowrap;
}
.btn .arrow{
  width:22px;height:1px;background:#fff;position:relative;
  transition:transform .2s ease;
}
.btn .arrow::after{
  content:"";position:absolute;right:0;top:-3px;
  width:7px;height:7px;border-top:1px solid #fff;border-right:1px solid #fff;transform:rotate(45deg);
}
@media (hover:hover){
  .btn:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover)}
  .btn:hover .arrow{transform:translateX(4px)}
}
@media (max-width:720px){
  .cta-grid{grid-template-columns:1fr;gap:24px;align-items:start}
  .btn{width:100%;min-height:64px}
}

/* footer */
.lp-foot{
  border-top:1px solid var(--color-line);
  padding:32px 24px;
  font-size:.78rem;
  color:var(--color-mute);
  text-align:center;
  letter-spacing:.06em;
}