/* ══════════════════════════════════════════════════════════
   ゆりかごから墓場まで — JCSS2026 OS
   配色・書体は冊子『不揃いな靴に選ばれる』から採取
   ══════════════════════════════════════════════════════════ */

:root{
  --paper:#F2F0EA;
  --paper-2:#E8E4DA;
  --paper-3:#DCD7CA;
  --ink:#283A6D;
  --ink-70:rgba(40,58,109,.72);
  --ink-45:rgba(40,58,109,.46);
  --ink-15:rgba(40,58,109,.15);
  --accent:#E2612B;
  --accent-soft:#EF7C49;
  --teal:#4FAFBE;
  --teal-soft:#77C9D5;
  --blue:#1D4399;
  --night:#0D0E11;
  --night-2:#15171C;
  --night-line:rgba(242,240,234,.14);

  --ja:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  --kyo:"Klee One","Hiragino Mincho ProN",serif;
  --lat:"Barlow Semi Condensed","Zen Kaku Gothic New",sans-serif;

  --page-ratio:0.70329;  /* B6 = 128 : 182 */
  --wrap:1120px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--ja);font-size:16px;line-height:1.95;
  font-feature-settings:"palt" 1;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skiplink{position:absolute;left:-9999px;top:0;z-index:200;background:var(--ink);color:var(--paper);padding:.7rem 1.2rem}
.skiplink:focus{left:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(20px,5vw,40px)}

/* ── ナビゲーション ───────────────────────────── */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;padding:14px clamp(18px,4vw,34px);
  background:rgba(13,14,17,0);transition:background .35s ease,backdrop-filter .35s ease;
  color:var(--paper);
}
.nav.is-stuck{background:rgba(242,240,234,.93);backdrop-filter:blur(10px);color:var(--ink);border-bottom:1px solid var(--ink-15)}
.nav__home{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--kyo);font-size:15px;letter-spacing:.06em}
.nav__mark{width:12px;height:12px;border-radius:50%;background:var(--accent-soft);box-shadow:14px 0 0 -3px var(--blue);flex:none}
.nav__links{display:flex;gap:clamp(12px,2vw,26px);font-size:13.5px;letter-spacing:.05em}
.nav__links a{text-decoration:none;opacity:.82;padding:4px 0;border-bottom:1px solid transparent;transition:opacity .2s,border-color .2s}
.nav__links a:hover{opacity:1;border-color:currentColor}
.nav__toggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav__toggle span{display:block;width:22px;height:1.5px;background:currentColor;margin:5px 0;transition:transform .3s,opacity .3s}
.nav.is-open .nav__toggle span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav.is-open .nav__toggle span:nth-child(2){opacity:0}
.nav.is-open .nav__toggle span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ── ヒーロー ─────────────────────────────────── */
.hero{position:relative;background:var(--night);color:var(--paper);overflow:hidden;padding:clamp(120px,16vh,190px) 0 clamp(60px,9vh,110px)}
.sky{position:absolute;inset:0;pointer-events:none}
.sky::after{ /* 月の地平線 */
  content:"";position:absolute;left:-5%;right:-5%;bottom:-14%;height:34%;
  background:radial-gradient(120% 100% at 50% 100%,#cbbf95 0%,#b2a67e 42%,transparent 72%);
  opacity:.5;filter:blur(1px);
}
.meteor{position:absolute;width:1px;height:190px;background:linear-gradient(to bottom,transparent,var(--accent-soft));transform:rotate(28deg);opacity:.55}
.m1{top:-12%;left:14%;animation:fall 9s linear infinite}
.m2{top:-20%;left:52%;height:260px;animation:fall 13s linear infinite 2.5s;opacity:.4}
.m3{top:-16%;left:76%;height:150px;animation:fall 11s linear infinite 5s;opacity:.45}
.m4{top:-25%;left:33%;height:120px;animation:fall 16s linear infinite 8s;opacity:.3}
@keyframes fall{0%{transform:translate3d(0,-10vh,0) rotate(28deg)}100%{transform:translate3d(30vw,120vh,0) rotate(28deg)}}

.hero__inner{position:relative;max-width:var(--wrap);margin:0 auto;padding:0 clamp(20px,5vw,40px);
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(30px,6vw,70px);align-items:center}
.eyebrow{font-family:var(--lat);font-size:12.5px;letter-spacing:.18em;color:var(--teal-soft);margin:0 0 22px;text-transform:none}
.hero__banner{
  display:inline-block;margin:0 0 18px;padding:5px 16px;
  background:var(--accent);color:#fff;font-family:var(--kyo);font-weight:600;
  font-size:clamp(14px,1.6vw,17px);letter-spacing:.1em;border-radius:2px;
}
.hero__title{
  font-family:var(--kyo);font-weight:600;margin:0 0 26px;
  font-size:clamp(28px,4.4vw,52px);line-height:1.42;letter-spacing:.02em;
}
.hero__title em{font-style:normal;color:var(--accent-soft)}
.hero__lead{margin:0 0 30px;font-size:15px;line-height:2.1;color:rgba(242,240,234,.78);max-width:34em}
.factlist{margin:0 0 32px;padding:20px 0;border-top:1px solid var(--night-line);border-bottom:1px solid var(--night-line);display:grid;gap:9px}
.factlist>div{display:grid;grid-template-columns:4.6em 1fr;gap:14px;align-items:baseline}
.factlist dt{font-family:var(--lat);font-size:12px;letter-spacing:.16em;color:var(--teal-soft)}
.factlist dd{margin:0;font-size:14.5px;line-height:1.8;color:rgba(242,240,234,.9)}
.todo{display:inline-block;margin-left:.5em;padding:1px 8px;border:1px dashed var(--accent-soft);border-radius:2px;font-size:11.5px;color:var(--accent-soft)}

.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;text-decoration:none;padding:12px 26px;border-radius:2px;font-size:14px;letter-spacing:.06em;transition:transform .2s,background .2s,color .2s;cursor:pointer;border:1px solid transparent}
.btn--accent{background:var(--accent);color:#fff}
.btn--accent:hover{background:var(--accent-soft);transform:translateY(-2px)}
.btn--ghost{border-color:rgba(242,240,234,.4);color:var(--paper)}
.btn--ghost:hover{border-color:var(--paper);transform:translateY(-2px)}
.btn--small{padding:8px 18px;font-size:13px;border-color:var(--ink-15);background:var(--paper);color:var(--ink)}
.btn--small:hover{border-color:var(--ink)}

.hero__book{margin:0;position:relative}
.hero__book img{
  width:100%;border-radius:2px;
  box-shadow:0 40px 80px rgba(0,0,0,.6),0 3px 0 rgba(255,255,255,.08);
  transform:rotate(-2.2deg);
}
.hero__book figcaption{margin-top:22px;font-size:12.5px;line-height:2;color:rgba(242,240,234,.62);text-align:center;font-family:var(--kyo)}
.hero__book figcaption b{color:rgba(242,240,234,.95);font-weight:600}
.hero__scroll{position:absolute;left:50%;bottom:26px;width:1px;height:44px;background:var(--night-line);overflow:hidden}
.hero__scroll span{position:absolute;inset:0;background:var(--accent-soft);animation:drip 2.6s ease-in-out infinite}
@keyframes drip{0%{transform:translateY(-100%)}60%,100%{transform:translateY(100%)}}

/* ── セクション共通 ───────────────────────────── */
.sec{padding:clamp(64px,9vw,120px) 0;position:relative}
.sec--paper{background:var(--paper)}
.sec--paper2{background:var(--paper-2)}
.sec--night{background:var(--night);color:var(--paper)}
.sec--book{padding-bottom:clamp(48px,7vw,90px)}

.sectag{display:flex;align-items:center;gap:12px;margin:0 0 14px;font-family:var(--lat);font-size:12.5px;letter-spacing:.2em;color:var(--accent)}
.sectag i{font-style:normal;font-size:11px;padding:2px 8px;border:1px solid currentColor;border-radius:999px;letter-spacing:.1em}
.sectag--light{color:var(--teal-soft)}
.sechead{font-family:var(--kyo);font-weight:600;font-size:clamp(22px,3.1vw,34px);line-height:1.62;margin:0 0 30px;letter-spacing:.01em}
.sechead--light{color:var(--paper)}
.lead{font-size:15px;line-height:2.1;color:var(--ink-70);margin:0 0 34px;max-width:44em}
.lead--light{color:rgba(242,240,234,.72)}

/* ── 概要 ─────────────────────────────────────── */
.about{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:clamp(28px,5vw,64px);align-items:start;margin-bottom:clamp(40px,6vw,70px)}
.about__body p{margin:0 0 1.4em;font-size:15.5px;line-height:2.15}
.about__points{list-style:none;margin:0;padding:26px 28px;background:var(--paper-2);border-left:3px solid var(--accent);display:grid;gap:20px}
.about__points li{font-size:13.5px;line-height:1.9;color:var(--ink-70)}
.about__points b{display:block;font-size:15px;color:var(--ink);margin-bottom:2px;font-family:var(--kyo);font-weight:600}

.qbox{border-top:1px solid var(--ink-15);border-bottom:1px solid var(--ink-15);padding:34px 0;margin-bottom:44px}
.qbox__head{font-family:var(--kyo);font-weight:600;font-size:17px;margin:0 0 20px;color:var(--accent)}
.qbox__list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px 34px}
.qbox__list li{position:relative;padding-left:26px;font-size:15px;line-height:1.95}
.qbox__list li::before{content:"";position:absolute;left:0;top:.72em;width:12px;height:12px;border-radius:50%;border:2px solid var(--teal)}

.audience h3{font-family:var(--lat);font-size:12.5px;letter-spacing:.2em;color:var(--ink-45);margin:0 0 14px;font-weight:500}
.audience ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.audience li{font-size:13px;padding:5px 14px;border:1px solid var(--ink-15);border-radius:999px;color:var(--ink-70)}

.steps-divider{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--accent) 0 22%,transparent 22% 30%,var(--blue) 30% 46%,transparent 46%);
  opacity:.35;
}

/* ── 当日の構成 ───────────────────────────────── */
.program{list-style:none;margin:0;padding:0;counter-reset:p;display:grid;gap:0}
.program li{display:grid;grid-template-columns:64px 1fr;gap:clamp(14px,3vw,32px);padding:26px 0;border-top:1px solid var(--ink-15);align-items:start}
.program li:last-child{border-bottom:1px solid var(--ink-15)}
.program__no{font-family:var(--lat);font-size:34px;line-height:1;color:var(--accent);opacity:.65;font-weight:500}
.program h3{font-family:var(--kyo);font-weight:600;font-size:18px;margin:0 0 4px;line-height:1.5}
.program .who{margin:0 0 6px;font-size:13px;letter-spacing:.06em;color:var(--teal)}
.program p:last-child{margin:0;font-size:14.5px;color:var(--ink-70);line-height:1.95}

/* ── 登壇者 ───────────────────────────────────── */
.speakers{list-style:none;margin:0 0 44px;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1px;background:var(--ink-15);border:1px solid var(--ink-15)}
.speakers li{background:var(--paper);padding:22px 24px;display:grid;gap:5px}
.speakers b{font-family:var(--kyo);font-weight:600;font-size:18px;letter-spacing:.04em}
.speakers span{font-size:12.5px;line-height:1.8;color:var(--ink-45)}
.flyer summary{cursor:pointer;font-size:14px;color:var(--accent);letter-spacing:.04em;padding:10px 0}
.flyer img{margin-top:16px;border:1px solid var(--ink-15);border-radius:2px}

/* ── 映像 ─────────────────────────────────────── */
.video{position:relative;aspect-ratio:16/9;background:#000;border-radius:3px;overflow:hidden;box-shadow:0 30px 70px rgba(0,0,0,.55)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video__play{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:#000;cursor:pointer}
.video__play img{width:100%;height:100%;object-fit:cover;opacity:.72;transition:opacity .3s,transform .5s}
.video__play:hover img{opacity:.9;transform:scale(1.02)}
.video__btn{position:absolute;left:50%;top:50%;width:78px;height:78px;margin:-39px 0 0 -39px;border-radius:50%;background:var(--accent);display:grid;place-items:center;transition:transform .25s}
.video__btn::after{content:"";width:0;height:0;margin-left:5px;border-left:20px solid #fff;border-top:13px solid transparent;border-bottom:13px solid transparent}
.video__play:hover .video__btn{transform:scale(1.08)}
.video__link{margin:18px 0 0;font-size:13.5px}
.video__link a{color:var(--teal-soft);text-decoration:none;border-bottom:1px solid rgba(119,201,213,.4)}

/* ══════════════════════════════════════════════
   フリップブック（右綴じ）
   ══════════════════════════════════════════════ */
.fb{margin:clamp(24px,4vw,44px) auto 0;max-width:1180px;padding:0 clamp(14px,4vw,40px)}
.fb__stage{perspective:3200px;perspective-origin:50% 50%;overflow:hidden;padding:30px 0 38px}
.fb__book{
  position:relative;margin:0 auto;width:100%;max-width:900px;
  aspect-ratio:calc(var(--page-ratio) * 2);
  transform-style:preserve-3d;
}
.fb__slot{position:absolute;top:0;height:100%;width:50%;overflow:hidden;background:#1B1D22}
.fb__slot--left{left:0;box-shadow:inset -22px 0 34px -26px rgba(0,0,0,.95)}
.fb__slot--right{left:50%;box-shadow:inset 22px 0 34px -26px rgba(0,0,0,.95)}
.fb__slot img{width:100%;height:100%;object-fit:cover;user-select:none}
.fb__slot img[src=""],.fb__slot img:not([src]){opacity:0}
.fb__gutter{position:absolute;left:calc(50% - 9px);top:0;width:18px;height:100%;pointer-events:none;
  background:linear-gradient(90deg,rgba(0,0,0,.35),rgba(0,0,0,.02) 45%,rgba(0,0,0,.02) 55%,rgba(0,0,0,.35));z-index:6}
.fb__book::after{ /* 影 */
  content:"";position:absolute;left:4%;right:4%;bottom:-26px;height:34px;z-index:-1;
  background:radial-gradient(60% 100% at 50% 0,rgba(0,0,0,.7),transparent 70%);filter:blur(6px);
}

.fb__flip{position:absolute;top:0;width:50%;height:100%;transform-style:preserve-3d;z-index:8;pointer-events:none;opacity:0}
.fb__flip.is-active{opacity:1}
.fb__flip.dir-next{left:50%;transform-origin:left center}
.fb__flip.dir-prev{left:0;transform-origin:right center}
.fb__face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;overflow:hidden;background:#1B1D22}
.fb__face img{width:100%;height:100%;object-fit:cover}
.fb__face--back{transform:rotateY(180deg)}
.fb__face::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.28),transparent 40%);opacity:0;transition:opacity .2s}
.fb__flip.is-turning .fb__face::after{opacity:1}

.fb__hit{position:absolute;top:0;height:100%;width:50%;background:none;border:0;cursor:pointer;z-index:7}
.fb__hit--next{left:0}
.fb__hit--prev{left:50%}
.fb__hit:disabled{cursor:default}

.fb__bar{max-width:900px;margin:0 auto;padding-top:20px}
.fb__trace{position:relative;height:6px;margin-bottom:16px}
.fb__trace-line{position:absolute;left:0;height:1.5px;border-radius:2px;transition:width .5s cubic-bezier(.4,0,.2,1)}
.fb__trace-line--orange{top:0;background:var(--accent-soft);width:0}
.fb__trace-line--blue{top:4px;background:var(--blue);width:0;transition-delay:.12s;opacity:.85}
.fb__trace::before{content:"";position:absolute;left:0;right:0;top:2px;height:1px;background:var(--night-line)}

.fb__controls{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.fb__btn{
  background:transparent;border:1px solid var(--night-line);color:rgba(242,240,234,.86);
  padding:9px 18px;border-radius:2px;font-size:13px;letter-spacing:.06em;cursor:pointer;
  text-decoration:none;transition:border-color .2s,background .2s,opacity .2s;
}
.fb__btn:hover:not(:disabled){border-color:var(--accent-soft);background:rgba(239,124,73,.1)}
.fb__btn:disabled{opacity:.28;cursor:default}
.fb__btn--icon{padding:9px 14px;font-size:12px;color:rgba(242,240,234,.6)}
.fb__count{font-family:var(--lat);font-size:14px;letter-spacing:.12em;min-width:9em;text-align:center;color:rgba(242,240,234,.8)}
.fb__sep{width:1px;height:20px;background:var(--night-line);margin:0 4px}

.fb__thumbs{max-width:1000px;margin:22px auto 0;display:flex;flex-direction:row-reverse;flex-wrap:wrap;justify-content:center;gap:8px}
.fb__thumbs button{padding:0;border:1px solid var(--night-line);background:none;cursor:pointer;line-height:0;border-radius:1px;transition:border-color .2s,transform .2s}
.fb__thumbs button:hover{border-color:var(--accent-soft);transform:translateY(-2px)}
.fb__thumbs button.is-current{border-color:var(--accent)}
.fb__thumbs img{width:52px}

.fb:fullscreen{background:var(--night);display:flex;flex-direction:column;justify-content:center;padding:24px}
.fb:fullscreen .fb__book{max-width:min(1400px,84vw);max-height:none}
.fb:fullscreen .fb__stage{display:grid;place-items:center}

.note-small{margin:clamp(28px,4vw,44px) 0 0;font-size:11.5px;line-height:2;color:rgba(242,240,234,.4);max-width:60em}

/* ── 用語解説 ─────────────────────────────────── */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin-bottom:clamp(44px,6vw,72px)}
.card{background:var(--paper-2);padding:28px 26px 24px;border-top:3px solid var(--card-accent,var(--accent));display:flex;flex-direction:column;gap:10px}
.card__kicker{margin:0;font-size:11.5px;letter-spacing:.14em;color:var(--card-accent,var(--accent))}
.card__title{font-family:var(--kyo);font-weight:600;font-size:22px;margin:0;line-height:1.45;letter-spacing:.02em}
.card p:not(.card__kicker){margin:0;font-size:13.5px;line-height:2;color:var(--ink-70)}
.jump{margin-top:auto;align-self:flex-start;background:none;border:0;border-bottom:1px solid var(--ink-15);padding:6px 0;font-size:12.5px;letter-spacing:.06em;color:var(--ink);cursor:pointer;transition:border-color .2s,color .2s}
.jump:hover{color:var(--accent);border-color:var(--accent)}

.notes{border-top:1px solid var(--ink-15);padding-top:34px;margin-bottom:clamp(40px,6vw,64px)}
.notes__head{font-family:var(--lat);font-size:14px;letter-spacing:.2em;margin:0 0 18px;font-weight:500;display:flex;align-items:baseline;gap:14px}
.notes__head span{font-family:var(--ja);font-size:11.5px;letter-spacing:.06em;color:var(--ink-45)}
.notes__list{list-style:none;margin:0;padding:0;display:grid;gap:0}
.notes__list li{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;padding:15px 0;border-bottom:1px solid var(--ink-15)}
.notes__list i{font-family:var(--lat);font-style:normal;font-size:13px;letter-spacing:.1em;color:var(--accent);opacity:.8}
.notes__list b{font-family:var(--kyo);font-weight:600;font-size:15.5px;line-height:1.6}

.pull{margin:0;padding:clamp(28px,4vw,44px) clamp(24px,4vw,48px);background:var(--night);color:var(--paper);
  font-family:var(--kyo);font-size:clamp(15px,1.9vw,19px);line-height:2.1;border-left:3px solid var(--accent)}
.pull cite{display:block;margin-top:18px;font-family:var(--ja);font-style:normal;font-size:12px;letter-spacing:.1em;color:var(--teal-soft)}

/* ── クレジット ───────────────────────────────── */
.credits{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:clamp(26px,4vw,54px);padding-top:8px}
.credits h3{font-family:var(--kyo);font-weight:600;font-size:15px;margin:0 0 14px;padding-bottom:8px;border-bottom:1px solid var(--ink-15)}
.credits h3+h3{margin-top:26px}
.credits dl{margin:0;display:grid;gap:6px}
.credits dl>div{display:grid;grid-template-columns:5em 1fr;gap:10px}
.credits dt{font-size:12px;color:var(--ink-45);letter-spacing:.08em}
.credits dd{margin:0;font-size:14px}
.credits__members{margin:0 0 14px;font-size:13.5px;line-height:2.1;color:var(--ink-70)}
.closing{margin:clamp(44px,6vw,72px) 0 0;text-align:center;font-family:var(--kyo);font-weight:600;
  font-size:clamp(17px,2.4vw,25px);letter-spacing:.05em;color:var(--accent)}

.foot{background:var(--night);color:rgba(242,240,234,.5);padding:38px 20px;text-align:center;font-size:12px;line-height:2}
.foot p{margin:0}
.foot__c{font-family:var(--lat);letter-spacing:.06em;margin-top:6px;opacity:.7}
.foot__license{margin-top:24px;padding-top:20px;border-top:1px solid rgba(242,240,234,.12);display:flex;flex-direction:column;align-items:center;gap:10px}
.foot__license img{border:0;display:block;opacity:.85;transition:opacity .2s}
.foot__license img:hover{opacity:1}
.foot__license p{margin:0;line-height:1.75;font-size:11.5px;white-space:nowrap}
.foot__license a{color:rgba(242,240,234,.7);text-underline-offset:2px;transition:color .2s}
.foot__license a:hover{color:var(--teal-soft)}

/* ── レスポンシブ ─────────────────────────────── */
@media (max-width:900px){
  .hero__inner{grid-template-columns:1fr;gap:44px}
  .hero__book{max-width:320px;margin:0 auto}
  .about{grid-template-columns:1fr}
  .nav__links{
    position:absolute;top:100%;right:12px;left:12px;
    flex-direction:column;gap:0;background:var(--paper);color:var(--ink);
    border:1px solid var(--ink-15);border-radius:3px;padding:8px 0;
    display:none;box-shadow:0 20px 50px rgba(0,0,0,.25);
  }
  .nav.is-open .nav__links{display:flex}
  .nav__links a{padding:12px 22px;opacity:1;border:0}
  .nav__toggle{display:block}
  .nav{background:rgba(13,14,17,.55);backdrop-filter:blur(8px)}
}
@media (max-width:640px){
  body{font-size:15px}
  .fb__slot--left,.fb__gutter{display:none}
  .fb__slot--right{left:0;width:100%;box-shadow:none}
  .fb__book{aspect-ratio:var(--page-ratio);max-width:400px}
  .fb__flip{width:100%}
  .fb__flip.dir-prev{left:0}
  .fb__flip.dir-next{left:0}
  .fb__hit{width:50%}
  .fb__count{min-width:7em;font-size:13px}
  .fb__btn{padding:8px 14px;font-size:12px}
  .program li{grid-template-columns:44px 1fr;gap:14px}
  .program__no{font-size:26px}
  .notes__list li{grid-template-columns:auto 1fr;row-gap:6px}
  .notes__list .jump{grid-column:2}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .meteor,.hero__scroll span{animation:none}
  *{transition-duration:.01ms !important}
}

/* ── 追加：空ページ・出現アニメ ─────────────── */
body{overflow-x:hidden}
.fb__slot.is-blank{background:#0F1115;box-shadow:inset 0 0 60px rgba(0,0,0,.8)}
.fb__slot.is-blank img{display:none}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.is-in{opacity:1;transform:none}
.card.reveal{transition-delay:.05s}
.card.reveal:nth-child(2){transition-delay:.12s}
.card.reveal:nth-child(3){transition-delay:.19s}
.card.reveal:nth-child(4){transition-delay:.26s}
.card.reveal:nth-child(5){transition-delay:.33s}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}

kbd{font-family:var(--lat);font-size:12px;padding:2px 8px;border:1px solid var(--night-line);border-radius:3px;background:rgba(255,255,255,.06)}

/* ── 追加：ナビのしるし・本のサイズ上限 ─────── */
.nav__mark{width:26px;height:12px;position:relative;background:none;box-shadow:none;border-radius:0}
.nav__mark::before,.nav__mark::after{content:"";position:absolute;border-radius:50%}
.nav__mark::before{left:0;top:0;width:12px;height:12px;background:var(--accent-soft)}
.nav__mark::after{left:16px;top:2.5px;width:9px;height:9px;background:var(--blue)}

.fb__book{max-width:min(900px,102vh)}
@media (max-width:640px){ .fb__book{max-width:min(400px,52vh)} }

/* ── 追加：固定ヘッダー分のアンカー余白 ─────── */
.sec,.hero{scroll-margin-top:76px}

/* ══════════════════════════════════════════════
   改訂 — 書体の締め直し・足跡・めくる向き
   ══════════════════════════════════════════════ */

/* ── 見出しまわりを角ゴシックへ（教科書体は引用と用語名だけに残す） ── */
.eyebrow{
  font-family:var(--ja);font-weight:500;font-size:12.5px;
  letter-spacing:.13em;color:var(--teal-soft);
}
.hero__banner{
  font-family:var(--ja);font-weight:700;
  font-size:clamp(13px,1.35vw,15.5px);letter-spacing:.15em;
  padding:8px 20px 8px 22px;border-radius:1px;line-height:1.5;
}
.hero__title{font-family:var(--ja);font-weight:700;letter-spacing:-.005em;line-height:1.4}
.nav__home{font-family:var(--ja);font-weight:500;letter-spacing:.08em}
.sechead{font-family:var(--ja);font-weight:700;letter-spacing:-.005em}
.qbox__head{font-family:var(--ja);font-weight:700;letter-spacing:.02em}
.about__points b{font-family:var(--ja);font-weight:700}
.program h3{font-family:var(--ja);font-weight:700}
.speakers b{font-family:var(--ja);font-weight:700}
.notes__list b{font-family:var(--ja);font-weight:500}
.credits h3{font-family:var(--ja);font-weight:700}
.closing{font-family:var(--ja);font-weight:700;letter-spacing:.03em}
.factlist dt{font-family:var(--ja);font-weight:500;font-size:11.5px;letter-spacing:.14em}

/* ── 足跡 ─────────────────────────────────── */
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.fp{display:block}
.fp--blue{fill:var(--blue)}
.fp--orange{fill:var(--accent-soft)}

.trail{
  display:flex;align-items:center;justify-content:center;
  gap:clamp(16px,3.4vw,32px);pointer-events:none;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent);
}
.trail svg{width:14px;height:22px;flex:none}
/* 進行方向は右→左（右綴じの読み方向） */
.trail svg:nth-child(odd){transform:rotate(-97deg) translateX(9px)}
.trail svg:nth-child(even){transform:rotate(-83deg) translateX(-9px)}

.trail--divider{padding:clamp(30px,5vw,52px) 0 0;opacity:.5}
.sec--paper .trail--divider,.sec--paper2 .trail--divider{opacity:.45}
.trail--hero{
  position:absolute;left:0;right:0;bottom:clamp(34px,7vh,74px);
  opacity:.42;z-index:1;
}
.trail--hero svg{width:17px;height:27px}

/* ── 進捗バー：右綴じに合わせて右から左へ ───── */
.fb__trace-line{left:auto;right:0}
.fb__walker{
  position:absolute;top:-9px;right:0;display:flex;gap:7px;
  transform:translateX(50%);transition:right .5s cubic-bezier(.4,0,.2,1);
}
.fb__walker svg{width:11px;height:17px}
.fb__walker svg:first-child{transform:rotate(-97deg) translateX(4px)}
.fb__walker svg:last-child{transform:rotate(-83deg) translateX(-4px)}

/* ── めくる向き：右ページをクリックで次へ ───── */
.fb__hit--next{left:50%}
.fb__hit--prev{left:0}
@media (max-width:640px){
  .fb__hit--next{left:50%}
  .fb__hit--prev{left:0}
  .trail svg{width:12px;height:19px}
  .trail{gap:20px}
}

/* ── 目次は左から順に並べる ─────────────────── */
.fb__thumbs{flex-direction:row}

/* ── 足跡の形と向きを調整（つま先は上向き・左右に振る） ── */
.trail{gap:clamp(22px,4vw,40px)}
.trail svg{width:21px;height:32px}
.trail svg:nth-child(odd){transform:translateY(-11px) rotate(-11deg)}
.trail svg:nth-child(even){transform:translateY(11px) rotate(9deg)}
.trail--divider{opacity:.6}
.sec--paper .trail--divider,.sec--paper2 .trail--divider{opacity:.55}
.trail--hero{opacity:.5;bottom:clamp(26px,5vh,54px)}
.trail--hero svg{width:24px;height:36px}

.fb__walker{top:-11px;gap:9px}
.fb__walker svg{width:13px;height:20px}
.fb__walker svg:first-child{transform:translateY(-5px) rotate(-11deg)}
.fb__walker svg:last-child{transform:translateY(5px) rotate(9deg)}

@media (max-width:640px){
  .trail svg{width:17px;height:26px}
  .trail{gap:22px}
}

/* 足跡の帯と重なるスクロール表示は外す */
.hero__scroll{display:none}
.fb__walker{top:-14px}

/* ══════════════════════════════════════════════
   足跡：かかとの切れを解消し、右方向へ歩かせる
   ══════════════════════════════════════════════ */

/* マスク領域の下端でかかとが切れていたため、上下に余白を確保 */
.trail{padding-block:20px;gap:clamp(16px,3.2vw,30px)}
.trail--divider{padding:clamp(24px,4.5vw,44px) 0 20px}

/* つま先を右へ。左足（青）は上、右足（オレンジ）は下に振る */
.trail svg{width:20px;height:31px}
.trail svg:nth-child(odd){transform:translateY(-10px) rotate(81deg)}
.trail svg:nth-child(even){transform:translateY(10px) rotate(99deg)}
.trail--hero svg{width:23px;height:35px}

/* 進捗バーも左から右へ（足跡の進行方向に合わせる） */
.fb__trace{height:8px}
.fb__trace-line{left:0;right:auto}
.fb__walker{
  left:0;right:auto;top:-13px;gap:8px;
  transition:left .5s cubic-bezier(.4,0,.2,1);
}
.fb__walker svg{width:13px;height:20px}
.fb__walker svg:first-child{transform:translateY(-5px) rotate(81deg)}
.fb__walker svg:last-child{transform:translateY(5px) rotate(99deg)}

@media (max-width:640px){
  .trail svg{width:17px;height:26px}
  .trail{gap:16px;padding-block:16px}
}

/* 足跡を少し大きく、歩幅を広げる */
.trail{gap:clamp(20px,3.6vw,34px)}
.trail svg{width:23px;height:35px}
.trail--hero svg{width:26px;height:40px}
@media (max-width:640px){ .trail svg{width:19px;height:29px} .trail{gap:16px} }

/* ══════════════════════════════════════════════
   足跡をうねらせる／セクションの収まり／裏表紙
   ══════════════════════════════════════════════ */

/* 直線の並びをやめ、正弦波に沿って配置（位置はJSが計算） */
.trail{
  position:relative;display:block;padding:0;gap:0;
  height:clamp(96px,11vw,132px);
}
.trail svg{position:absolute;width:21px;height:32px;transform-origin:50% 50%}
.trail--divider{margin-top:clamp(16px,3vw,34px);opacity:.32}
.sec--paper .trail--divider,.sec--paper2 .trail--divider{opacity:.28}
.trail--hero{
  position:absolute;left:0;right:0;bottom:0;
  height:clamp(110px,13vw,150px);opacity:.3;
}
.trail--hero svg{width:24px;height:37px}
@media (max-width:640px){
  .trail{height:clamp(84px,22vw,110px)}
  .trail svg{width:17px;height:26px}
  .trail--hero svg{width:19px;height:29px}
}

/* 冊子セクション：見出しからバーまでが一画面に収まる高さに */
.sec--book{padding-top:clamp(44px,5.5vw,74px)}
.sec--book .sechead{margin-bottom:12px}
.sec--book .lead{margin-bottom:0}
.fb{margin-top:clamp(16px,2.4vw,28px)}
.fb__stage{padding:22px 0 28px}
.fb__book{max-width:min(860px,72vh)}
.fb__bar{padding-top:14px}
@media (max-width:640px){ .fb__book{max-width:min(400px,50vh)} }

/* 裏表紙への切り替え */
.fb__book{transition:opacity .25s ease}
.fb__book.is-fading{opacity:0}
.fb__book{max-width:min(860px,66vh)}
@media (max-width:640px){ .fb__book{max-width:min(400px,48vh)} }

/* 映像も見出しごと一画面に収まる大きさに */
#film{padding-top:clamp(44px,5.5vw,74px)}
#film .sechead{margin-bottom:12px}
#film .lead{margin-bottom:26px}
.video{width:min(100%,calc(56vh * 1.7778));margin-inline:auto}
@media (max-width:640px){ .video{width:100%} }
@media (max-width:640px){ .fb__book{max-width:min(400px,46vh)} }

/* ヒーローの足跡は外し、スクロールの手がかりを戻す */
.hero__scroll{display:block}

/* 進捗バーはめくりと同じ時間・同じ加減速で動かす */
.fb__trace-line,.fb__walker{transition-duration:.62s;transition-timing-function:cubic-bezier(.42,.02,.28,1)}
.fb__trace-line--blue{transition-delay:.06s}

/* 見開き／1ページの切り替え用に、狭い画面でも見開きが選べるよう調整 */
@media (max-width:560px){
  .fb__slot--left,.fb__gutter{display:none}
  .fb__slot--right{left:0;width:100%;box-shadow:none}
  .fb__book{aspect-ratio:var(--page-ratio);max-width:min(400px,46vh)}
  .fb__flip,.fb__flip.dir-next,.fb__flip.dir-prev{width:100%;left:0}
}

/* ══════════════════════════════════════════════
   表示モードは画面幅ではなくJSのクラスで決める
   （「見開き／1ページ」ボタンで手動切替できるように）
   ══════════════════════════════════════════════ */
.fb.is-single .fb__slot--left,
.fb.is-single .fb__gutter{display:none}
.fb.is-single .fb__slot--right{left:0;width:100%;box-shadow:none}
.fb.is-single .fb__book{aspect-ratio:var(--page-ratio);max-width:min(400px,52vh)}
.fb.is-single .fb__flip,
.fb.is-single .fb__flip.dir-next,
.fb.is-single .fb__flip.dir-prev{width:100%;left:0}

.fb:not(.is-single) .fb__slot--left{display:block;left:0;width:50%;box-shadow:inset -22px 0 34px -26px rgba(0,0,0,.95)}
.fb:not(.is-single) .fb__slot--right{left:50%;width:50%;box-shadow:inset 22px 0 34px -26px rgba(0,0,0,.95)}
.fb:not(.is-single) .fb__gutter{display:block}
.fb:not(.is-single) .fb__book{aspect-ratio:calc(var(--page-ratio) * 2);max-width:min(860px,66vh)}
.fb:not(.is-single) .fb__flip{width:50%}
.fb:not(.is-single) .fb__flip.dir-next{left:50%}
.fb:not(.is-single) .fb__flip.dir-prev{left:0}
@media (max-width:900px){ .fb:not(.is-single) .fb__book{max-width:min(96vw,66vh)} }

/* ══════════════════════════════════════════════
   登壇者／企画者・キービジュアル・発行元ロゴ
   ══════════════════════════════════════════════ */
.grouplabel{
  margin:0 0 12px;font-family:var(--ja);font-weight:500;
  font-size:12px;letter-spacing:.2em;color:var(--accent);
  display:flex;align-items:center;gap:12px;
}
.grouplabel::after{content:"";flex:1;height:1px;background:var(--ink-15)}
.grouplabel--center{justify-content:center}
.grouplabel--center::after{display:none}
.speakers{margin:0 0 34px}
.speakers--two{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));max-width:640px}

.keyvisual{margin:clamp(16px,3vw,32px) 0 0}
.keyvisual img{width:100%;border:1px solid var(--ink-15);border-radius:2px}
.keyvisual figcaption{margin-top:10px;font-size:11px;letter-spacing:.04em;color:var(--ink-45);text-align:right}

.logos{margin-top:clamp(34px,5vw,58px);padding-top:clamp(26px,4vw,42px);border-top:1px solid var(--ink-15)}
.logos ul{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  gap:clamp(26px,6vw,66px);
}
.logos img{height:clamp(36px,4.2vw,52px);width:auto}
@media (max-width:640px){
  .logos ul{gap:26px}
  .logos img{height:34px}
}

/* 人数が半端でも空きマスが出ないように */
.speakers{display:flex;flex-wrap:wrap;gap:1px;background:var(--ink-15);border:1px solid var(--ink-15)}
.speakers li{flex:1 1 200px;background:var(--paper)}
.sec--paper2 .speakers li{background:var(--paper-2)}

/* ロゴは高さを揃えるのではなく、見た目の面積を揃える */
.logos ul{gap:clamp(30px,5vw,64px)}
.logos .logo{display:flex;align-items:center}
.logos .logo--otemon img{height:clamp(42px,4.6vw,58px)}
.logos .logo--keio   img{height:clamp(46px,5vw,62px)}
.logos .logo--toyota img{height:clamp(36px,3.9vw,50px)}
@media (max-width:640px){
  .logos ul{gap:24px}
  .logos .logo--otemon img{height:38px}
  .logos .logo--keio img{height:42px}
  .logos .logo--toyota img{height:32px}
}

/* ロゴをもう少し小さく。念のため箇条書きの点も明示的に消す */
.logos ul{list-style:none;margin:0;padding:0}
.logos ul li{list-style:none}
.logos ul li::marker{content:""}
.logos .logo--otemon img{height:clamp(34px,3.6vw,46px)}
.logos .logo--keio   img{height:clamp(36px,3.9vw,50px)}
.logos .logo--toyota img{height:clamp(29px,3.1vw,40px)}
@media (max-width:640px){
  .logos ul{gap:22px}
  .logos .logo--otemon img{height:32px}
  .logos .logo--keio img{height:35px}
  .logos .logo--toyota img{height:27px}
}

/* 右綴じであることを操作バーにも明示する */
.fb__bind{
  font-size:11px;letter-spacing:.16em;color:var(--teal-soft);
  border:1px solid rgba(119,201,213,.45);border-radius:999px;
  padding:5px 12px;margin-right:6px;white-space:nowrap;
}
@media (max-width:640px){ .fb__bind{font-size:10px;padding:4px 9px} }

/* ══════════════════════════════════════════════
   右綴じの正しい向きへ
   ・閉じた本は左半分に置かれる（表紙は左・裏表紙は右）
   ・紙は左から右へめくれる
   ══════════════════════════════════════════════ */
.fb__flip.dir-next{left:0;transform-origin:right center}
.fb__flip.dir-prev{left:50%;transform-origin:left center}
.fb.is-single .fb__flip.dir-next{left:0;width:100%;transform-origin:right center}
.fb__hit--next{left:0}
.fb__hit--prev{left:50%}

/* ══════════════════════════════════════════════
   優先順位の修正
   .fb:not(.is-single) 付きの古い規則の方が強く、めくれる紙が
   右半分に置かれたまま右端を軸に回っていた（本の外へ紙が出る）
   ══════════════════════════════════════════════ */
.fb:not(.is-single) .fb__flip.dir-next{left:0;transform-origin:right center}
.fb:not(.is-single) .fb__flip.dir-prev{left:50%;transform-origin:left center}
.fb:not(.is-single) .fb__hit--next{left:0}
.fb:not(.is-single) .fb__hit--prev{left:50%}
.fb.is-single .fb__flip.dir-next,
.fb.is-single .fb__flip.dir-prev{left:0;width:100%;transform-origin:right center}
.fb__bind{display:none}

/* ══════════════════════════════════════════════
   その他修正
   ══════════════════════════════════════════════ */

/* ① ノドの影：中央がいちばん濃く、外へ向かって抜ける（18%→0・幅8%） */
.fb__gutter{
  left:45.5%;width:9%;
  background:linear-gradient(90deg,
    rgba(0,0,0,0) 0%,
    rgba(0,0,0,.18) 50%,
    rgba(0,0,0,0) 100%);
}
.fb:not(.is-single) .fb__slot--left,
.fb:not(.is-single) .fb__slot--right{box-shadow:none}

/* ② 進捗バーと足跡は右から左へ（読み進む向きに合わせる） */
.fb__trace-line{left:auto;right:0}
.fb__walker{left:auto;right:0;transition:right .62s cubic-bezier(.42,.02,.28,1)}
.fb__walker svg:first-child{transform:translateY(-5px) rotate(261deg)}
.fb__walker svg:last-child{transform:translateY(5px) rotate(279deg)}

/* ③ 目次を閉じられなかった不具合（display:flex が hidden を打ち消していた） */
.fb__thumbs[hidden]{display:none}

/* ④ 全画面のとき、下端が見切れないよう高さでも上限をかける */
.fb:fullscreen .fb__book{max-width:min(1500px,88vw,104vh)}
.fb.is-single:fullscreen .fb__book{max-width:min(620px,92vw,52vh)}

/* いま開いている章 */
.fb__part{
  margin:0 0 12px;text-align:center;
  font-size:12px;letter-spacing:.12em;color:rgba(119,201,213,.85);
}
@media (max-width:640px){ .fb__part{font-size:11px;margin-bottom:10px} }