/* =========================================================
   SANDBOX TOTTORI AI COMMUNITY — 砂の地平線 / Horizon LP
   color: 深ネイビー / 砂ベージュ / ネオンブルー点アクセント
   type : Zen Kaku Gothic New (JP) / Instrument Serif (accent)
   ========================================================= */
:root{
  --navy-900: #050D1C;
  --navy-800: #0B1D3A;
  --navy-700: #122A52;
  --navy-600: #1B3D76;
  --sand-100: #F5EBD6;
  --sand-200: #E9DCBE;
  --sand-300: #DCC7A1;
  --sand-400: #C2A66E;
  --neon-300: #6FB6FF;
  --neon-500: #00B6FF;
  --neon-600: #0066FF;
  --ink-100: #E7ECF2;
  --ink-200: #B6C2D1;
  --ink-300: #7E8EA3;
  --ink-400: #55657A;
  --line-10: rgba(230,236,244,0.10);
  --line-20: rgba(230,236,244,0.20);
  --line-40: rgba(230,236,244,0.40);
  --serif: 'Instrument Serif', 'Hiragino Mincho ProN', serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --jp: 'Zen Kaku Gothic New', system-ui, -apple-system, 'Hiragino Sans', sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html,body{background:var(--navy-900);color:var(--ink-100);font-family:var(--jp);-webkit-font-smoothing:antialiased;}
body{overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;}
em{font-style:normal;}

/* ===== TOP BAR ===== */
.top-bar{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px;
  padding:14px 36px;
  background:linear-gradient(180deg, rgba(5,16,31,0.85), rgba(5,16,31,0));
  backdrop-filter:blur(8px);
}
.top-bar__brand img{height:34px;filter:brightness(1.05);}
.top-bar__meta{
  display:flex;align-items:center;gap:12px;justify-self:center;
  font-family:var(--mono);font-size:11px;letter-spacing:0.08em;color:var(--ink-200);
  text-transform:uppercase;
}
.meta-dot{width:8px;height:8px;border-radius:50%;background:#7FE69A;box-shadow:0 0 8px #7FE69A;animation:pulse 2s infinite;}
.meta-sep{opacity:0.4;}
@keyframes pulse{50%{opacity:0.3;}}
.top-bar__cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border:1px solid var(--line-40);border-radius:999px;
  font-size:13px;letter-spacing:0.04em;font-weight:500;
  transition:all .25s ease;
}
.top-bar__cta:hover{background:var(--sand-100);color:var(--navy-900);border-color:var(--sand-100);}

/* ===== SIDE NAV ===== */
.side-nav{
  position:fixed;left:28px;top:50%;transform:translateY(-50%);z-index:40;
  display:flex;flex-direction:column;align-items:center;gap:24px;
  color:var(--ink-200);
}
.side-nav__logo{
  width:36px;height:36px;border:1px solid var(--line-20);border-radius:50%;
  display:grid;place-items:center;
  font-family:var(--mono);font-size:10px;letter-spacing:0.1em;
  color:var(--sand-200);
}
.side-nav__dots{display:flex;flex-direction:column;gap:14px;}
.dot{
  position:relative;width:22px;height:22px;display:grid;place-items:center;
}
.dot span{
  width:6px;height:6px;border-radius:50%;background:var(--ink-300);transition:all .3s;
}
.dot:hover span,.dot.is-active span{background:var(--sand-100);width:10px;height:10px;box-shadow:0 0 10px var(--sand-200);}
.dot::before{
  content:attr(data-label);
  position:absolute;left:28px;top:50%;transform:translateY(-50%);
  font-family:var(--mono);font-size:10px;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--ink-200);opacity:0;pointer-events:none;white-space:nowrap;transition:opacity .2s;
}
.dot:hover::before,.dot.is-active::before{opacity:1;}
.side-nav__hourglass{
  position:relative;margin-top:12px;color:var(--sand-200);
  display:flex;flex-direction:column;align-items:center;gap:6px;
}
.side-nav__hourglass svg{width:18px;height:44px;}
.progress-num{font-family:var(--mono);font-size:10px;letter-spacing:0.08em;color:var(--ink-300);}

/* =========================================================
   SECTION 0 — HERO
   ========================================================= */
.hero{
  position:relative;min-height:100vh;overflow:hidden;
  background:var(--navy-900);
}
.hero__sky{
  position:absolute;inset:0;
  background:
    linear-gradient(180deg, rgba(5,13,28,0.45) 0%, rgba(11,29,58,0.25) 40%, rgba(11,29,58,0.55) 80%, rgba(5,13,28,0.85) 100%),
    url('assets/hero_dunes.png') center center / cover no-repeat;
}
/* 星 */
.hero__sky::before{
  content:"";position:absolute;inset:0;
  background-image:
    radial-gradient(1px 1px at 14% 22%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 32% 38%, #cde 50%, transparent 51%),
    radial-gradient(1px 1px at 67% 19%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 84% 41%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 48% 12%, #cde 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 26%, #fff 50%, transparent 51%),
    radial-gradient(2px 2px at 58% 34%, #fff 50%, transparent 51%);
  opacity:0.8;
}
.hero__horizon{
  position:absolute;left:0;right:0;bottom:0;height:0;
  overflow:hidden;display:none;
}
.hero__dune-far,.hero__dune-mid,.hero__dune-near{
  position:absolute;left:-10%;right:-10%;bottom:0;
  background-repeat:repeat-x;background-size:auto 100%;
  will-change:transform;
}
.hero__dune-far{
  height:38vh;bottom:42%;
  background:
    radial-gradient(ellipse 600px 100px at 20% 90%, rgba(194,166,110,0.25), transparent 70%),
    radial-gradient(ellipse 700px 120px at 70% 85%, rgba(194,166,110,0.18), transparent 70%);
}
.hero__dune-mid{
  height:48vh;
  background:
    radial-gradient(ellipse 600px 240px at 10% 100%, #7B6337 40%, transparent 72%),
    radial-gradient(ellipse 800px 260px at 55% 100%, #8C7143 40%, transparent 70%),
    radial-gradient(ellipse 700px 220px at 100% 100%, #705A30 40%, transparent 72%);
  filter:saturate(0.9);
}
.hero__dune-near{
  height:28vh;
  background:
    radial-gradient(ellipse 700px 200px at 25% 100%, #C2A66E 45%, transparent 70%),
    radial-gradient(ellipse 900px 240px at 80% 100%, #AE9055 45%, transparent 72%);
}
/* 光のグリッド(夜のAI的視覚) */
.hero__horizon::after{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(90deg, transparent 49.8%, rgba(111,182,255,0.12) 50%, transparent 50.2%),
    linear-gradient(0deg, transparent 49.8%, rgba(111,182,255,0.06) 50%, transparent 50.2%);
  background-size:120px 120px, 120px 120px;
  mask-image:linear-gradient(0deg, rgba(0,0,0,0.5), transparent 70%);
  mix-blend-mode:screen;
  transform:perspective(400px) rotateX(58deg);
  transform-origin:50% 100%;
}
#sand-canvas{
  position:absolute;inset:0;width:100%;height:100%;pointer-events:none;
}

.hero__content{
  position:relative;z-index:2;
  padding:140px 96px 0 140px;
  max-width:1240px;
}
.hero__eyebrow{display:flex;align-items:center;gap:14px;margin-bottom:28px;}
.eyebrow__line{display:block;width:42px;height:1px;background:var(--sand-300);}
.eyebrow__text{font-family:var(--mono);font-size:11px;letter-spacing:0.22em;color:var(--sand-200);text-transform:uppercase;}
.hero__title{
  font-weight:900;line-height:1.02;letter-spacing:-0.02em;
  font-size:clamp(56px, 8.4vw, 124px);
  color:var(--sand-100);
  text-shadow:0 2px 40px rgba(0,0,0,0.4);
}
.hero__title-line{display:block;}
.hero__title-line--accent{color:var(--ink-100);}
.hero__title .char{
  display:inline-block;opacity:0;transform:translateY(0.4em);
  animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards;
}
.hero__title-line--accent .char{color:var(--ink-100);}
.hero__title-line--accent .char:nth-child(1),
.hero__title-line--accent .char:nth-child(2){color:var(--sand-100);}
.hero__title .char:nth-child(1){animation-delay:.05s;}
.hero__title .char:nth-child(2){animation-delay:.12s;}
.hero__title .char:nth-child(3){animation-delay:.19s;}
.hero__title .char:nth-child(4){animation-delay:.26s;}
.hero__title .char:nth-child(5){animation-delay:.33s;}
.hero__title .char:nth-child(6){animation-delay:.40s;}
.hero__title .char:nth-child(7){animation-delay:.47s;}
@keyframes rise{to{opacity:1;transform:translateY(0);}}

.hero__title-en{
  display:block;margin-top:18px;
  font-family:var(--serif);font-style:italic;font-weight:400;
  font-size:clamp(20px,2vw,30px);letter-spacing:0.01em;color:var(--sand-200);
  opacity:0;animation:rise .8s ease .9s forwards;
}
.hero__lead{
  margin-top:40px;max-width:560px;
  font-size:15px;line-height:1.9;color:var(--ink-200);
  opacity:0;animation:rise .8s ease 1.1s forwards;
  margin-bottom:48px;
}
.hero__lead span{display:block;}
.hero__lead-sub{margin-top:10px !important;color:var(--ink-300);font-size:13px;}

.hero__scroll-hint{
  position:absolute;right:140px;bottom:140px;z-index:3;
  display:flex;align-items:center;gap:14px;
  opacity:0;animation:rise 1s ease 1.6s forwards;
}
.scroll-hint__label{font-family:var(--mono);font-size:10px;letter-spacing:0.22em;color:var(--sand-200);text-transform:uppercase;}
.scroll-hint__bar{position:relative;display:block;width:120px;height:1px;background:var(--line-20);overflow:hidden;}
.scroll-hint__fill{position:absolute;left:-40%;top:0;width:40%;height:100%;background:var(--sand-200);animation:sweep 2.4s ease-in-out infinite;}
@keyframes sweep{50%{left:100%;}100%{left:100%;}}

/* Instruments 計器風の数字 */
.hero__instruments{
  position:absolute;left:0;right:0;bottom:0;z-index:3;
  display:grid;grid-template-columns:repeat(4,1fr);
  padding:22px 140px;
  background:linear-gradient(180deg, transparent, rgba(5,16,31,0.85));
  border-top:1px solid var(--line-10);
}
.instrument{
  display:flex;flex-direction:column;gap:4px;
  padding:0 28px;border-left:1px solid var(--line-10);
}
.instrument:first-child{border-left:none;padding-left:0;}
.instrument__label{font-family:var(--mono);font-size:10px;letter-spacing:0.2em;color:var(--ink-300);text-transform:uppercase;}
.instrument__value{
  font-family:var(--serif);font-style:italic;font-weight:400;
  font-size:40px;line-height:1;color:var(--sand-100);
}
.instrument__value--text{font-family:var(--jp);font-style:normal;font-weight:700;font-size:28px;}
.instrument__unit{font-family:var(--mono);font-size:11px;letter-spacing:0.1em;color:var(--ink-300);}

/* =========================================================
   SECTION 1 — ABOUT
   ========================================================= */
.about{
  position:relative;padding:160px 140px 180px;
  background:linear-gradient(180deg, var(--navy-900) 0%, #061428 60%, var(--navy-900) 100%);
}
.about__index,.chapters__index,.base__index,.faq__index,.join__index,.schedule__index{
  font-family:var(--mono);font-size:11px;letter-spacing:0.22em;color:var(--sand-200);
  text-transform:uppercase;margin-bottom:40px;
  display:inline-flex;align-items:center;gap:12px;
}
.about__index::before,.chapters__index::before,.base__index::before,
.faq__index::before,.join__index::before,.schedule__index::before{
  content:"";display:block;width:28px;height:1px;background:var(--sand-300);
}
.about__grid{
  display:grid;grid-template-columns:40px 1fr 340px;gap:64px;align-items:start;
}
.about__tategaki{
  writing-mode:vertical-rl;font-feature-settings:"vpal";
  font-size:14px;letter-spacing:0.1em;line-height:2.4;color:var(--ink-300);
  border-right:1px solid var(--line-10);padding-right:8px;
}
.about__title{
  font-size:clamp(44px,5vw,72px);font-weight:900;line-height:1.12;letter-spacing:-0.01em;
  color:var(--ink-100);max-width:680px;
}
.about__title em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--sand-100);}
.about__text{margin:40px 0;max-width:640px;}
.about__text p{font-size:15px;line-height:2;color:var(--ink-200);margin-bottom:20px;text-wrap:pretty;}
.about__pillars{list-style:none;display:flex;gap:28px;margin-top:48px;}
.about__pillars li{
  flex:1;padding:24px;border:1px solid var(--line-10);border-radius:2px;
  background:rgba(10,26,46,0.4);
  display:flex;flex-direction:column;gap:8px;
  transition:border-color .3s,background .3s;
}
.about__pillars li:hover{border-color:var(--sand-300);background:rgba(15,35,66,0.4);}
.pillar__num{font-family:var(--serif);font-style:italic;font-size:32px;color:var(--sand-300);}
.pillar__title{font-size:18px;font-weight:700;color:var(--ink-100);letter-spacing:0.02em;}
.pillar__desc{font-size:13px;color:var(--ink-200);line-height:1.7;}

/* =========================================================
   SECTION 2 — CHAPTERS (Activities)
   ========================================================= */
.chapters{
  position:relative;background:#061428;
  padding:140px 0 40px;
}
.chapters__header{
  padding:0 140px;
  display:grid;grid-template-columns:1fr auto;gap:40px;align-items:end;
  margin-bottom:64px;
}
.chapters__title{font-size:clamp(40px,4.5vw,64px);font-weight:900;line-height:1.1;letter-spacing:-0.01em;}
.chapters__title em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--sand-100);}
.chapters__nav{display:flex;align-items:center;gap:18px;}
.chapters__progress{display:block;width:180px;height:1px;background:var(--line-20);position:relative;overflow:hidden;}
.chapters__progress-fill{position:absolute;left:0;top:0;height:100%;background:var(--sand-100);width:33%;transition:width .6s cubic-bezier(.2,.7,.2,1);}
.chapters__counter{font-family:var(--mono);font-size:14px;color:var(--sand-200);letter-spacing:0.08em;}
.chapters__counter b{color:var(--ink-100);font-weight:500;}

.chapters__track{
  display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;
  padding:0 140px;gap:48px;scroll-padding-left:140px;
  scrollbar-width:none;
}
.chapters__track::-webkit-scrollbar{display:none;}
.chapter{
  flex:0 0 calc(100vw - 280px);max-width:1280px;
  display:grid;grid-template-columns:1fr 1.2fr;gap:56px;align-items:center;
  scroll-snap-align:start;
  position:relative;padding:56px 0;
}
.chapter--invert{grid-template-columns:1.2fr 1fr;}
.chapter--invert .chapter__left{order:2;}
.chapter__kicker{font-family:var(--mono);font-size:12px;letter-spacing:0.22em;color:var(--sand-300);margin-bottom:22px;}
.chapter__title{font-size:clamp(36px,3.6vw,54px);font-weight:900;line-height:1.15;letter-spacing:-0.01em;margin-bottom:22px;}
.chapter__lead{font-size:16px;line-height:1.9;color:var(--ink-200);margin-bottom:32px;max-width:520px;}
.chapter__meta{display:grid;grid-template-columns:1fr 1fr;gap:14px 32px;margin-bottom:36px;max-width:520px;}
.chapter__meta div{border-top:1px solid var(--line-10);padding-top:10px;}
.chapter__meta dt{font-family:var(--mono);font-size:10px;letter-spacing:0.18em;color:var(--ink-300);text-transform:uppercase;}
.chapter__meta dd{font-size:14px;color:var(--ink-100);margin-top:4px;}
.chapter__link{
  display:inline-flex;align-items:center;gap:10px;padding:12px 0;
  border-bottom:1px solid var(--sand-300);color:var(--sand-100);
  font-weight:500;font-size:14px;letter-spacing:0.04em;
  transition:gap .25s;
}
.chapter__link span{font-family:var(--serif);font-style:italic;}
.chapter__link:hover{gap:16px;}

.chapter__figure{position:relative;}

/* ===== New Chapter Visuals (no photos) ===== */
.visual{
  position:relative;
  border:1px solid var(--line-20);
  background:linear-gradient(135deg, rgba(15,35,66,0.5), rgba(10,26,46,0.8));
  overflow:hidden;
}

/* Chapter I — video mock */
.visual--video{display:grid;grid-template-columns:1.4fr 1fr;gap:0;}
.visual__window{padding:14px;}
.visual__window-bar{
  display:flex;align-items:center;gap:8px;padding-bottom:12px;border-bottom:1px solid var(--line-10);
  font-family:var(--mono);font-size:10px;letter-spacing:0.1em;color:var(--ink-300);
}
.visual__window-bar span{width:10px;height:10px;border-radius:50%;background:#2A3A52;display:block;}
.visual__window-bar em{margin-left:12px;font-style:normal;}
.visual__screen{
  position:relative;aspect-ratio:16/10;margin-top:12px;
  background:radial-gradient(ellipse at 50% 40%, rgba(111,182,255,0.18), transparent 60%), #05101F;
  border:1px solid var(--line-10);
  display:flex;flex-direction:column;justify-content:space-between;padding:16px;
}
.visual__wave{position:absolute;inset:0;color:rgba(111,182,255,0.5);display:grid;place-items:center;padding:24px;}
.visual__wave svg{width:100%;height:60%;opacity:0.55;}
.visual__play{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:62px;height:62px;border-radius:50%;
  background:rgba(245,235,214,0.14);border:1px solid var(--sand-200);
  display:grid;place-items:center;color:var(--sand-100);
}
.visual__play svg{width:22px;height:22px;margin-left:3px;}
.visual__timebar{
  position:relative;display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:10px;letter-spacing:0.1em;color:var(--ink-200);
}
.visual__track{flex:1;height:2px;background:rgba(229,220,190,0.15);position:relative;overflow:hidden;}
.visual__track span{position:absolute;left:0;top:0;bottom:0;width:34%;background:var(--sand-100);}
.visual__caption{
  position:relative;font-family:var(--serif);font-style:italic;color:var(--sand-100);font-size:15px;
  text-align:left;margin-top:auto;
}
.visual__list{
  list-style:none;padding:20px;border-left:1px solid var(--line-10);
  display:flex;flex-direction:column;gap:14px;
}
.visual__list li{
  display:flex;align-items:baseline;gap:10px;font-size:13px;color:var(--ink-200);
  padding-bottom:10px;border-bottom:1px dashed var(--line-10);
}
.visual__list li:last-child{border-bottom:none;}
.visual__list b{font-family:var(--mono);font-size:10px;letter-spacing:0.12em;color:var(--sand-300);font-weight:500;}
.visual__list em{
  font-family:var(--mono);font-style:normal;font-size:9px;letter-spacing:0.16em;
  color:var(--neon-300);border:1px solid rgba(111,182,255,0.4);padding:2px 6px;margin-left:auto;
}

/* Chapter II — floor plan + schedule */
.visual--desks{display:grid;grid-template-columns:1.2fr 1fr;gap:0;}
.visual__room{position:relative;border-right:1px solid var(--line-10);}
.visual__room svg{display:block;width:100%;height:100%;}
.visual__schedule{padding:22px 20px;display:flex;flex-direction:column;gap:10px;justify-content:center;}
.visual__schedule-row{
  display:grid;grid-template-columns:40px 1fr auto;gap:12px;align-items:center;
  font-family:var(--mono);font-size:10px;letter-spacing:0.14em;color:var(--ink-300);
}
.visual__schedule-row .dow{}
.visual__schedule-row .bar{
  height:6px;background:rgba(229,220,190,0.08);position:relative;
}
.visual__schedule-row .tag{color:var(--sand-100);font-size:10px;}
.visual__schedule-row--active .dow{color:var(--sand-100);}
.visual__schedule-row--active .bar{background:rgba(229,220,190,0.12);}
.visual__schedule-row--active .bar b{
  position:absolute;left:10%;top:0;bottom:0;width:50%;background:var(--sand-100);
}
.chapter__figure figcaption{
  margin-top:14px;font-family:var(--mono);font-size:11px;letter-spacing:0.12em;
  color:var(--ink-300);text-transform:uppercase;
}
.chapter__ornament{
  position:absolute;right:-20px;top:-20px;
  font-family:var(--serif);font-style:italic;font-size:260px;color:rgba(229,220,190,0.04);
  line-height:1;pointer-events:none;z-index:0;
}

.chapters__controls{
  display:flex;justify-content:flex-end;gap:10px;padding:32px 140px 0;
}
.ch-btn{
  width:48px;height:48px;border:1px solid var(--line-20);border-radius:50%;
  display:grid;place-items:center;color:var(--ink-100);transition:all .25s;
}
.ch-btn:hover{background:var(--sand-100);color:var(--navy-900);border-color:var(--sand-100);}

/* =========================================================
   SECTION 3 — BASE (TOTTORI SANDBOX map)
   ========================================================= */
.base{
  position:relative;padding:160px 140px;
  background:linear-gradient(180deg,#061428,#0A1A2E);
}
.base__head{display:grid;grid-template-columns:1.1fr 1fr;gap:64px;margin-bottom:56px;align-items:end;}
.base__title{font-size:clamp(40px,4.5vw,64px);font-weight:900;line-height:1.1;letter-spacing:-0.01em;}
.base__title em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--sand-100);}
.base__lead{font-size:15px;line-height:2;color:var(--ink-200);max-width:460px;}
.base__lead b{color:var(--sand-100);font-weight:700;letter-spacing:0.05em;}

/* Two-column stage: map on the left, info panel on the right */
.base__stage{
  display:grid;grid-template-columns:1.55fr 1fr;gap:2px;
  background:var(--line-10);border:1px solid var(--line-10);
}
.base__mapwrap{background:#05101F;display:flex;flex-direction:column;}
.base__map-head{
  display:flex;align-items:center;gap:14px;padding:14px 20px;
  border-bottom:1px solid var(--line-10);
  font-family:var(--mono);font-size:10px;letter-spacing:0.18em;color:var(--ink-300);
  text-transform:uppercase;
}
.base__map-head-dot{
  width:8px;height:8px;border-radius:50%;background:#7FE69A;
  box-shadow:0 0 8px #7FE69A;
}
.base__map-head-scale{margin-left:auto;color:var(--sand-200);}

.base__map{
  position:relative;flex:1;min-height:560px;
  background:radial-gradient(ellipse at 60% 70%, rgba(15,35,66,0.6), #05101F 80%);
  overflow:hidden;
}
.base__map-svg{position:absolute;inset:0;width:100%;height:100%;}

.base__tick{
  position:absolute;width:16px;height:16px;pointer-events:none;
  border-color:var(--sand-200);border-style:solid;border-width:0;opacity:0.5;
}
.base__tick--tl{top:14px;left:14px;border-top-width:1px;border-left-width:1px;}
.base__tick--tr{top:14px;right:14px;border-top-width:1px;border-right-width:1px;}
.base__tick--bl{bottom:14px;left:14px;border-bottom-width:1px;border-left-width:1px;}
.base__tick--br{bottom:14px;right:14px;border-bottom-width:1px;border-right-width:1px;}

.base__pin-ripple{animation:ripple 2.4s infinite ease-out;}
.base__pin-ripple--2{animation-delay:1.2s;}
@keyframes ripple{
  0%{r:10;opacity:0.9;}
  100%{r:40;opacity:0;}
}
.base__route{stroke-dashoffset:0;animation:dash 12s linear infinite;}
@keyframes dash{to{stroke-dashoffset:-100;}}

/* Info panel */
.base__panel{
  background:#0A1A2E;padding:44px 36px;
  display:flex;flex-direction:column;gap:22px;
  position:relative;
}
.base__panel::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg, transparent, var(--sand-300), transparent);
  opacity:0.4;
}
.base__panel-head{
  display:flex;align-items:center;gap:14px;
  font-family:var(--mono);font-size:10px;letter-spacing:0.22em;color:var(--sand-200);text-transform:uppercase;
}
.base__panel-num{
  font-family:var(--serif);font-style:italic;font-size:22px;color:var(--sand-100);letter-spacing:0;
  text-transform:none;
}
.base__panel-kicker::before{content:"—  ";color:var(--ink-300);}

.base__panel-title{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(40px,3.6vw,60px);line-height:0.98;letter-spacing:-0.01em;
  color:var(--sand-100);display:flex;flex-direction:column;gap:2px;
  word-break:keep-all;overflow-wrap:break-word;
}
.base__panel-title span{display:block;}
.base__panel-title span:first-child{font-style:italic;}
.base__panel-title span:last-child{color:var(--ink-100);font-weight:500;font-family:var(--jp);letter-spacing:0.02em;}

.base__panel-body{
  font-size:14px;line-height:1.95;color:var(--ink-200);
  padding-bottom:22px;border-bottom:1px solid var(--line-10);
}

.base__spec{display:flex;flex-direction:column;gap:12px;}
.base__spec div{
  display:grid;grid-template-columns:74px 1fr;gap:14px;align-items:baseline;
  padding-bottom:10px;border-bottom:1px dashed var(--line-10);
}
.base__spec div:last-child{border-bottom:none;padding-bottom:0;}
.base__spec dt{
  font-family:var(--mono);font-size:10px;letter-spacing:0.18em;color:var(--ink-300);text-transform:uppercase;
}
.base__spec dd{color:var(--ink-100);font-size:13px;font-weight:500;}
.base__spec-mono{font-family:var(--mono);font-weight:400 !important;font-size:12px !important;color:var(--sand-200) !important;}

.base__panel-foot{
  margin-top:auto;padding-top:20px;border-top:1px solid var(--line-10);
  display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:10px;letter-spacing:0.16em;color:var(--ink-200);
}
.base__panel-foot-label{color:var(--ink-300);}
.base__panel-foot-dot{
  width:7px;height:7px;border-radius:50%;background:#7FE69A;
  box-shadow:0 0 8px rgba(127,230,154,0.8);
  animation:pulse 2s infinite;
}
.base__panel-foot-value{color:var(--sand-100);}

.base__footnote{
  margin-top:22px;font-size:12px;color:var(--ink-300);letter-spacing:0.04em;
}

/* =========================================================
   SECTION 3 — SCHEDULE
   ========================================================= */
.schedule{
  position:relative;padding:160px 140px;
  background:linear-gradient(180deg, var(--navy-900) 0%, #061428 60%, var(--navy-900) 100%);
}
.schedule__grid{
  display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start;
  max-width:1200px;
}
.schedule__theme-panel{
  background:rgba(10,26,46,0.6);border:1px solid var(--line-20);border-radius:2px;
  padding:40px;position:sticky;top:120px;
}
.schedule__panel-tag{
  font-family:var(--mono);font-size:10px;letter-spacing:0.22em;color:var(--neon-300);
  text-transform:uppercase;margin-bottom:20px;
  display:inline-flex;align-items:center;gap:8px;
}
.schedule__panel-tag::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--neon-300);
  box-shadow:0 0 8px var(--neon-300);animation:pulse 2s infinite;
}
.schedule__panel-date{
  font-family:var(--mono);font-size:12px;letter-spacing:0.15em;color:var(--sand-300);
  margin-bottom:12px;
}
.schedule__panel-title{
  font-size:clamp(22px,2.8vw,38px);font-weight:900;line-height:1.2;
  color:var(--sand-100);letter-spacing:-0.01em;margin-bottom:20px;
}
.schedule__panel-desc{
  font-size:14px;line-height:2;color:var(--ink-200);
}
.schedule__panel-time{
  margin-top:28px;padding-top:20px;border-top:1px solid var(--line-10);
  display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:0.08em;color:var(--ink-300);
}
.schedule__time-dot{
  width:8px;height:8px;border-radius:50%;background:var(--neon-300);
  box-shadow:0 0 6px var(--neon-300);flex-shrink:0;
}
.schedule__panel-cta{
  margin-top:32px;display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--sand-200);border-bottom:1px solid var(--line-20);padding-bottom:4px;
  transition:color .2s,border-color .2s;
}
.schedule__panel-cta:hover{color:var(--sand-100);border-color:var(--sand-300);}
.schedule__list-panel{display:flex;flex-direction:column;}
.schedule__list-label{
  font-family:var(--mono);font-size:10px;letter-spacing:0.22em;color:var(--sand-200);
  text-transform:uppercase;margin-bottom:24px;
  display:flex;align-items:center;gap:12px;
}
.schedule__list-label::before{content:"";display:block;width:28px;height:1px;background:var(--sand-300);}
.schedule__list{list-style:none;display:flex;flex-direction:column;}
.schedule__item{
  display:grid;grid-template-columns:110px 1fr auto;align-items:center;gap:16px;
  padding:20px 0;border-bottom:1px solid var(--line-10);
  transition:background .2s;
}
.schedule__item:first-child{border-top:1px solid var(--line-10);}
.schedule__item--active{background:rgba(111,182,255,0.04);margin:0 -16px;padding:20px 16px;}
.schedule__item__date{
  font-family:var(--mono);font-size:12px;letter-spacing:0.08em;color:var(--sand-300);
}
.schedule__item--active .schedule__item__date{color:var(--neon-300);}
.schedule__item__title{
  font-size:14px;font-weight:500;color:var(--ink-200);line-height:1.4;
}
.schedule__item--active .schedule__item__title{color:var(--sand-100);}
.schedule__item__tag{
  font-family:var(--mono);font-size:9px;letter-spacing:0.15em;
  color:var(--ink-300);background:rgba(230,236,244,0.06);
  padding:4px 8px;border-radius:2px;white-space:nowrap;text-transform:uppercase;
}
.schedule__item--active .schedule__item__tag{color:var(--neon-300);background:rgba(111,182,255,0.1);}
.schedule__edit-note{
  margin-top:32px;padding:16px 20px;border:1px dashed var(--line-10);border-radius:2px;
  font-family:var(--mono);font-size:11px;letter-spacing:0.08em;color:var(--ink-400);
  line-height:1.8;
}
.schedule__edit-note b{color:var(--ink-300);}

/* =========================================================
   SECTION 4 — FAQ
   ========================================================= */
.faq{padding:160px 140px;background:#061428;}
.faq__title{font-size:clamp(36px,4vw,56px);font-weight:900;margin-bottom:48px;letter-spacing:-0.01em;}
.faq__list{max-width:900px;}
.faq__item{border-top:1px solid var(--line-10);}
.faq__item:last-child{border-bottom:1px solid var(--line-10);}
.faq__item summary{
  list-style:none;cursor:pointer;padding:26px 0;
  display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;
  font-size:17px;font-weight:500;letter-spacing:0.01em;
}
.faq__item summary::-webkit-details-marker{display:none;}
.faq__item summary::after{
  content:"";width:14px;height:14px;position:relative;
  border-right:1px solid var(--sand-200);border-bottom:1px solid var(--sand-200);
  transform:rotate(45deg);transition:transform .3s;
}
.faq__item[open] summary::after{transform:rotate(-135deg);}
.faq__q{font-family:var(--serif);font-style:italic;font-size:22px;color:var(--sand-300);}
.faq__a{
  display:grid;grid-template-columns:auto 1fr;gap:20px;padding:0 0 28px 0;
  animation:slideDown .35s ease;
}
.faq__a span{font-family:var(--serif);font-style:italic;font-size:22px;color:var(--neon-300);}
.faq__a p{font-size:14px;line-height:2;color:var(--ink-200);max-width:720px;}
@keyframes slideDown{from{opacity:0;transform:translateY(-6px);}to{opacity:1;transform:translateY(0);}}

/* =========================================================
   SECTION 7 — JOIN
   ========================================================= */
.join{
  position:relative;padding:160px 140px;
  background:
    radial-gradient(ellipse 80% 60% at 100% 0%, rgba(111,182,255,0.12), transparent 60%),
    radial-gradient(ellipse 80% 60% at 0% 100%, rgba(194,166,110,0.08), transparent 60%),
    linear-gradient(180deg,#061428,#05101F);
}
.join__grid{display:grid;grid-template-columns:1fr 1.1fr;gap:80px;align-items:start;}
.join__title{font-size:clamp(48px,5.5vw,84px);font-weight:900;line-height:1.05;letter-spacing:-0.02em;}
.join__title em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--sand-100);}
.join__lead{margin-top:28px;font-size:15px;line-height:1.9;color:var(--ink-200);max-width:440px;}
.join__list{list-style:none;margin-top:32px;display:flex;flex-direction:column;gap:12px;}
.join__list li{font-family:var(--mono);font-size:12px;letter-spacing:0.1em;color:var(--ink-200);text-transform:uppercase;}
.join__list b{color:var(--sand-100);}

.join__form{
  background:rgba(15,35,66,0.35);border:1px solid var(--line-10);border-radius:2px;
  padding:40px;display:flex;flex-direction:column;gap:24px;
  position:relative;
}
.join__form::before{
  content:"FORM № 2026-NEW-01";position:absolute;top:18px;right:24px;
  font-family:var(--mono);font-size:10px;letter-spacing:0.2em;color:var(--ink-300);
}

/* ----- Google Form variant ----- */
.join__form--gform{gap:18px;}
.join__gform-head{
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:10px;letter-spacing:0.18em;color:var(--ink-300);
  text-transform:uppercase;
  padding-bottom:14px;border-bottom:1px dashed var(--line-20);
}
.join__gform-tag{
  padding:4px 8px;border:1px solid var(--sand-300);color:var(--sand-200);letter-spacing:0.22em;
}
.join__gform-host{margin-left:auto;color:var(--sand-200);font-size:11px;letter-spacing:0.1em;}
.join__gform-title{
  font-size:clamp(26px,2.4vw,34px);font-weight:900;line-height:1.2;letter-spacing:-0.005em;
  color:var(--sand-100);margin-top:4px;
}
.join__gform-desc{font-size:14px;line-height:1.85;color:var(--ink-200);}
.join__gform-list{
  list-style:none;display:flex;flex-direction:column;gap:10px;
  padding:18px 0;border-top:1px solid var(--line-10);border-bottom:1px solid var(--line-10);
}
.join__gform-list li{
  display:grid;grid-template-columns:36px 1fr;gap:14px;align-items:baseline;
  font-size:14px;color:var(--ink-100);
}
.join__gform-list li span{
  font-family:var(--mono);font-size:10px;letter-spacing:0.18em;color:var(--sand-300);
}
.join__gform-list li small{color:var(--ink-300);margin-left:6px;font-size:11px;}
.join-field{display:flex;flex-direction:column;gap:8px;}
.join-field label{
  font-family:var(--mono);font-size:10px;letter-spacing:0.2em;color:var(--sand-200);text-transform:uppercase;
}
.join-field label small{color:var(--ink-300);margin-left:4px;}
.join-field input[type=text],.join-field input[type=email]{
  background:transparent;border:none;border-bottom:1px solid var(--line-20);
  padding:10px 0;color:var(--ink-100);font-size:16px;font-family:var(--jp);
  transition:border-color .2s;
}
.join-field input:focus{outline:none;border-color:var(--sand-100);}
.join-chips{display:flex;flex-wrap:wrap;gap:8px;}
.join-chips label{
  display:inline-block;font-family:var(--jp);letter-spacing:0;text-transform:none;
}
.join-chips input{position:absolute;opacity:0;pointer-events:none;}
.join-chips span{
  display:inline-block;padding:10px 18px;border:1px solid var(--line-20);border-radius:999px;
  font-size:13px;color:var(--ink-200);cursor:pointer;transition:all .2s;font-family:var(--jp);
}
.join-chips input:checked + span{background:var(--sand-100);color:var(--navy-900);border-color:var(--sand-100);}
.join-chips label:hover span{border-color:var(--sand-300);color:var(--ink-100);}

.join-submit{
  position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:18px 24px;background:var(--sand-100);color:var(--navy-900);
  border:none;font-family:var(--jp);font-weight:700;font-size:15px;letter-spacing:0.04em;
  cursor:pointer;text-decoration:none;
  transition:background .25s;
}
.join-submit:hover{background:#fff;}
.join-submit__arrow{font-family:var(--serif);font-style:italic;font-size:22px;}
.join-submit__sent{
  position:absolute;inset:0;display:grid;place-items:center;
  background:var(--navy-800);color:var(--sand-100);
  transform:translateY(100%);transition:transform .4s cubic-bezier(.2,.7,.2,1);
}
.join__form.is-sent .join-submit__sent{transform:translateY(0);}
.join-fineprint{font-size:11px;color:var(--ink-300);line-height:1.6;}
.join-fineprint a{color:var(--sand-200);border-bottom:1px solid var(--line-20);}

/* ----- LP-native form (GAS) ----- */
.jform{display:flex;flex-direction:column;gap:18px;}
.jform__row{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media (max-width:720px){.jform__row{grid-template-columns:1fr;}}
.jform__field{display:flex;flex-direction:column;gap:8px;}
.jform__label{
  font-family:var(--mono);font-size:10px;letter-spacing:0.2em;color:var(--sand-200);
  text-transform:uppercase;display:flex;align-items:baseline;gap:8px;
}
.jform__label i{font-style:normal;color:var(--sand-300);font-size:9px;}
.jform__label em{color:#E27D7D;font-style:normal;margin-left:2px;}
.jform__label small{color:var(--ink-300);margin-left:4px;text-transform:none;letter-spacing:0.05em;}
.jform__field input,.jform__field select,.jform__field textarea{
  background:transparent;border:none;border-bottom:1px solid var(--line-20);
  padding:10px 0;color:var(--ink-100);font-size:15px;font-family:var(--jp);
  transition:border-color .2s;width:100%;border-radius:0;
}
.jform__field textarea{resize:vertical;min-height:72px;line-height:1.7;}
.jform__field select{appearance:none;background:transparent url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%23B6C2D1' stroke-width='1.5'/></svg>") no-repeat right 4px center/10px 7px;padding-right:24px;}
.jform__field select option{background:var(--navy-800);color:var(--ink-100);}
.jform__field input:focus,.jform__field select:focus,.jform__field textarea:focus{outline:none;border-color:var(--sand-100);}
.jform__field.is-error input,.jform__field.is-error select,.jform__field.is-error textarea{border-color:#E27D7D;}
.jform__check{display:flex;gap:10px;align-items:flex-start;font-size:13px;color:var(--ink-200);line-height:1.6;cursor:pointer;}
.jform__check input{margin-top:3px;accent-color:var(--sand-100);}
.jform__honey{position:absolute;left:-9999px;opacity:0;pointer-events:none;height:0;width:0;}
.jform__status{font-family:var(--mono);font-size:11px;letter-spacing:0.12em;min-height:18px;color:var(--ink-300);}
.jform__status.is-success{color:#7FCBA2;}
.jform__status.is-error{color:#E27D7D;}
.join-submit[disabled]{opacity:0.55;cursor:wait;}
.join-submit.is-loading .join-submit__label::after{content:"…";margin-left:4px;}

/* =========================================================
   FOOTER
   ========================================================= */
.foot{
  position:relative;padding:120px 140px 60px;
  background:var(--navy-900);overflow:hidden;
}
.foot__illustration{
  position:absolute;left:0;right:0;top:0;height:90px;
  background:url('assets/footer_illustration.png') center top/auto 90px repeat-x;
  opacity:0.9;
}
.foot__grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;
  margin-top:80px;margin-bottom:64px;
  padding-top:48px;border-top:1px solid var(--line-10);
}
.foot__brand img{height:40px;margin-bottom:16px;}
.foot__brand p{font-size:12px;color:var(--ink-300);line-height:1.8;}
.foot__col h4{
  font-family:var(--mono);font-size:10px;letter-spacing:0.22em;color:var(--sand-200);
  text-transform:uppercase;margin-bottom:20px;
}
.foot__col a{display:block;font-size:14px;color:var(--ink-200);line-height:2.2;transition:color .2s;}
.foot__col a:hover{color:var(--sand-100);}
.foot__bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  padding-top:32px;border-top:1px solid var(--line-10);
  font-family:var(--mono);font-size:11px;letter-spacing:0.08em;color:var(--ink-300);
}
.foot__sig{color:var(--sand-200);font-family:var(--serif);font-style:italic;font-size:14px;letter-spacing:0;}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1200px){
  .hero{min-height:auto;}
  .hero__content{padding:120px 64px 32px 120px;}
  .hero__horizon{height:56vh;top:auto;bottom:380px;}
  .hero__instruments{position:static;padding:24px 64px 24px 120px;}
  .hero__scroll-hint{position:static;padding:8px 64px 32px 120px;margin-top:0;}
  .scroll-hint__bar{width:80px;}
  .about,.chapters__header,.base,.faq,.join,.foot{padding-left:120px;padding-right:64px;}
  .chapters__controls{padding-left:120px;padding-right:64px;}
  .chapters__track{padding-left:120px;padding-right:64px;scroll-padding-left:120px;}
  .chapter{flex:0 0 calc(100vw - 200px);}
}
@media (max-width: 1100px){
  /* side-nav はタブレット以下で完全に非表示 */
  .side-nav{display:none;}
  .hero__content{padding:140px 48px 24px 72px;}
  .hero__scroll-hint{padding:8px 48px 32px 72px;}
  .hero__instruments{position:static;padding:24px 48px 24px 72px;}
  .about,.chapters__header,.base,.faq,.join,.foot{padding-left:72px;padding-right:56px;}
  .chapters__controls{padding-left:72px;padding-right:56px;}
  .chapters__track{padding-left:72px;padding-right:56px;scroll-padding-left:72px;}
  .about__grid{grid-template-columns:28px 1fr;}
  .base__head{grid-template-columns:1fr;gap:32px;}
  .base__stage{grid-template-columns:1fr;}
  .base__map{min-height:480px;}
  .base__panel{padding:32px 28px;}
  .join__grid{grid-template-columns:1fr;}
}
@media (max-width: 900px){
  .hero__content{padding:120px 40px 20px 48px;}
  .hero__scroll-hint{padding:8px 40px 28px 48px;}
  .hero__instruments{padding:20px 40px 20px 48px;grid-template-columns:1fr 1fr;gap:4px 0;}
  .about,.chapters__header,.base,.faq,.join,.foot{padding-left:48px;padding-right:40px;}
  .chapters__controls{padding-left:48px;padding-right:40px;}
  .chapters__track{padding-left:48px;padding-right:40px;scroll-padding-left:48px;}
  .base__map{min-height:440px;}
  .base__panel-title{font-size:clamp(32px,7vw,44px);}
}
@media (max-width: 768px){
  .top-bar{grid-template-columns:auto 1fr;padding:12px 18px;gap:12px;}
  .top-bar__meta{display:none;}
  .hero__content{padding:100px 24px 16px 24px;}
  .hero__scroll-hint{padding:4px 24px 24px 24px;}
  .hero__instruments{padding:16px 24px;grid-template-columns:1fr 1fr;gap:4px 0;}
  .about,.chapters__header,.base,.faq,.join,.foot{padding-left:24px;padding-right:24px;}
  .chapters__track{padding:0 24px;scroll-padding-left:24px;}
  .chapter{flex:0 0 calc(100vw - 48px);grid-template-columns:1fr;gap:32px;padding:32px 0;}
  .chapter--invert{grid-template-columns:1fr;}
  .chapter--invert .chapter__left{order:0;}
  .about__grid{grid-template-columns:1fr;gap:32px;}
  .about__tategaki{display:none;}
  .about__pillars{flex-direction:column;gap:12px;}
  .base__map{min-height:360px;}
  .base__panel{padding:28px 22px;}
  .base__panel-title{font-size:clamp(28px,8vw,38px);}
  .base__spec div{grid-template-columns:64px 1fr;gap:10px;}
  .join__form{padding:24px;}
  .foot__grid{grid-template-columns:1fr 1fr;gap:32px;}
}