/* ============================================================
   IVJS — Immersive Vehicles Japan Server / ivj.jp
   サイトそのものが一本の道路。
   3D は背景レイヤー、文字はすべて DOM に置く。
   body.is-reading で 3D を捨てて通常の記事表示に切り替わる。
   ============================================================ */

:root{
  --paper:#f2f2f0;
  --surface:#ffffff;
  --ink:#0b0c0e;
  --dim:#5e626a;
  --mute:#95999f;
  --line:rgba(11,12,14,.14);
  --line2:rgba(11,12,14,.26);

  --red:#ff1f1f;
  --red-pure:#ff0000;
  --amber:#ffab2e;

  --ff:"Zen Kaku Gothic New",system-ui,-apple-system,"Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
  --ff-en:"Space Grotesk","Zen Kaku Gothic New",sans-serif;
  --ff-m:"JetBrains Mono",ui-monospace,Consolas,monospace;

  --gut:clamp(16px,4vw,54px);
  --ease:cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html.is-ready{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--ff);
  font-size:16px; line-height:1.9;
  font-feature-settings:"palt" 1;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body.is-boot{overflow:hidden;height:100vh}

img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.02em}
p,dl,ul,ol{margin:0}
ul,ol{list-style:none;padding:0}
::selection{background:var(--red);color:#fff}

.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.dot{width:8px;height:8px;border-radius:50%;background:var(--red-pure);flex:none;display:inline-block}


/* ============================================================
   3D と走行距離
   ============================================================ */

.stage{position:fixed;inset:0;z-index:0}
.stage canvas{display:block;width:100%;height:100%}
.scroller{height:1400vh;pointer-events:none}


/* ============================================================
   回転計（共有部品）
   ============================================================ */

.tc-edge{fill:none;stroke:var(--line);stroke-width:1}
.tc-track{fill:none;stroke:rgba(11,12,14,.10);stroke-width:3;stroke-linecap:round}
.tc-arc{fill:none;stroke:var(--ink);stroke-width:3;stroke-linecap:round;transition:stroke .25s}
svg.is-red .tc-arc{stroke:var(--red)}
.tc-tick{stroke:var(--line2);stroke-width:1.4}
.tc-tick.is-maj{stroke:var(--ink);stroke-width:2.6}
.tc-tick.is-red{stroke:var(--red);opacity:.55}
.tc-tick.is-maj.is-red{opacity:1}
.tc-num{font-family:var(--ff-en);font-weight:500;font-size:27px;fill:var(--ink)}
.tc-num.is-red{fill:var(--red)}
.tc-red{fill:none;stroke:var(--red);stroke-width:4}
.tc-needle line{stroke:var(--ink);stroke-width:5;stroke-linecap:round;transition:stroke .25s}
svg.is-red .tc-needle line{stroke:var(--red)}
.tc-hub{fill:var(--paper);stroke:var(--ink);stroke-width:3}
.tc-hub2{fill:var(--ink)}
.tc-digits{font-family:var(--ff-m);font-weight:500;font-size:34px;fill:var(--ink);font-variant-numeric:tabular-nums}
.tc-unit{font-family:var(--ff-m);font-size:11px;letter-spacing:.14em;fill:var(--mute)}


/* ============================================================
   始動
   計器盤の中心にキーシリンダーがある、という構成。
   ============================================================ */

.ign{
  position:fixed; inset:0; z-index:300;
  background:
    radial-gradient(120% 90% at 50% 42%, #ffffff 0%, var(--paper) 55%, #e9e9e6 100%);
  display:flex; align-items:center; justify-content:center;
  transition:opacity .9s var(--ease),visibility .9s;
}
.ign.is-off{opacity:0;visibility:hidden}

/* 薄い枠。画面が締まる */
.ign__frame{
  position:absolute; inset:clamp(12px,2vw,26px);
  border:1px solid var(--line);
  pointer-events:none;
}
.ign__frame::before,.ign__frame::after{
  content:""; position:absolute; width:18px; height:18px; border:1px solid var(--ink);
}
.ign__frame::before{left:-1px;top:-1px;border-right:0;border-bottom:0}
.ign__frame::after{right:-1px;bottom:-1px;border-left:0;border-top:0}

.ign__in{
  position:relative;
  display:flex; flex-direction:column; align-items:center;
  gap:clamp(12px,2vh,22px);
  padding:22px; text-align:center;
}
.ign__brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--ff-en);font-weight:700;font-size:22px;letter-spacing:.01em;
}
.ign__sub{
  font-family:var(--ff-m);font-size:9px;letter-spacing:.34em;
  color:var(--mute);margin-top:-8px;text-indent:.34em;
}

/* ---- 計器盤 ---- */
.cluster{
  position:relative;
  width:clamp(250px,38vh,336px); aspect-ratio:1;
  display:grid; place-items:center;
  margin:clamp(4px,1vh,12px) 0;
}
/* 外周の細い輪。目盛りの外側にもう一枚 */
.cluster__ring{
  position:absolute; inset:-14px;
  border:1px solid var(--line);
  border-radius:50%;
}
.cluster__ring::after{
  content:""; position:absolute; inset:6px;
  border:1px solid rgba(11,12,14,.06);
  border-radius:50%;
}
.cluster__tach{position:absolute;inset:0}
.cluster__tach svg{width:100%;height:100%;overflow:visible}
/* 始動画面の中心にはキーが入る。数字と軸は出さない */
.cluster__tach .tc-digits,.cluster__tach .tc-unit,
.cluster__tach .tc-hub,.cluster__tach .tc-hub2{display:none}

/* ---- キーシリンダー ---- */
.ign__key{
  position:relative; z-index:2;
  width:38%; aspect-ratio:1;
  display:grid; place-items:center;
  border-radius:50%;
  background:
    radial-gradient(100% 100% at 50% 30%, #ffffff 0%, #f1f1ee 60%, #e4e4e0 100%);
  border:1px solid var(--line2);
  box-shadow:
    0 10px 26px rgba(11,12,14,.14),
    inset 0 1px 0 #fff,
    inset 0 -10px 18px rgba(11,12,14,.05);
  transition:transform .6s var(--ease),box-shadow .4s;
}
.ign__key:disabled{opacity:.4;cursor:default}
.ign__key:not(:disabled):hover{box-shadow:0 14px 34px rgba(11,12,14,.20),inset 0 1px 0 #fff}
.ign__key.is-turning,.ign__key.is-on{transform:rotate(90deg)}

.ign__key-arc{position:absolute;inset:-10px;width:calc(100% + 20px);height:calc(100% + 20px)}
.ign__key-arc circle{fill:none;stroke-width:2.5}
.ka-track{stroke:rgba(11,12,14,.08)}
.ka-fill{
  stroke:var(--red);stroke-linecap:round;
  stroke-dasharray:339.29;stroke-dashoffset:339.29;
}

/* 鍵穴そのもの */
.ign__key-face{width:52%;display:block}
.ign__key-face svg{width:100%;height:auto;display:block}
/* 鍵穴のシルエット。線ではなく面で抜く */
.kf-hole{fill:var(--ink);stroke:none}
.ign__key.is-on .kf-hole,.ign__key.is-turning .kf-hole{fill:var(--red)}

.ign__key-label{
  position:absolute; bottom:-26px; left:50%; transform:translateX(-50%);
  font-family:var(--ff-m); font-size:8.5px; letter-spacing:.28em;
  color:var(--mute); text-indent:.28em; white-space:nowrap;
}
.ign__key.is-on .ign__key-label,
.ign__key.is-turning .ign__key-label{color:var(--red)}

.ign__lamps{display:flex;gap:6px;margin-top:12px}
.ign__lamps li{
  font-family:var(--ff-m);font-size:8.5px;letter-spacing:.16em;
  padding:4px 11px;border-radius:99px;
  border:1px solid var(--line);color:rgba(11,12,14,.20);
  transition:color .25s,background .25s,border-color .25s,box-shadow .25s;
}
.ign__lamps li.is-lit{
  color:#fff;background:var(--red);border-color:var(--red);
  box-shadow:0 3px 12px rgba(255,31,31,.35);
}

.ign__hint{display:flex;flex-direction:column;gap:3px;min-height:38px}
.ign__hint b{font-size:14px}
.ign__hint span{font-family:var(--ff-m);font-size:9.5px;letter-spacing:.18em;color:var(--mute)}
.ign__hint.is-wait b{color:var(--mute);font-weight:500}
.ign__skip{
  font-family:var(--ff-m);font-size:10px;letter-spacing:.12em;color:var(--mute);
  border-bottom:1px solid transparent;padding-bottom:2px;
}
.ign__skip:hover{color:var(--ink);border-bottom-color:var(--line2)}


/* ============================================================
   走行 UI
   ============================================================ */

.ui{position:fixed;inset:0;z-index:20;pointer-events:none}
.ui>*{pointer-events:auto}

/* --- 上部のガントリー標識 --- */
.gantry{
  position:absolute; top:0; left:0; right:0;
  display:flex; align-items:flex-start; justify-content:center;
}
.gantry__board{
  position:relative;
  display:flex; align-items:stretch;
  max-width:min(880px,78vw);
  background:#0b0c0e; border-radius:0 0 5px 5px;
  box-shadow:0 16px 38px rgba(11,12,14,.26);
  overflow:hidden;
}
/* 上端の取付部。ここだけ明るくして「吊られている」ことを示す */
.gantry__board::before{
  content:""; position:absolute; left:0; right:0; top:0; height:3px;
  background:linear-gradient(90deg,
    transparent 0, rgba(255,255,255,.22) 12%,
    rgba(255,255,255,.22) 88%, transparent 100%);
}
.gantry__label{
  display:flex;align-items:center;gap:8px;padding:0 15px;flex:none;
  border-right:1px solid rgba(255,255,255,.12);
  font-size:11.5px;color:rgba(255,255,255,.9);
}
.gantry__label .led{
  width:5px;height:5px;border-radius:50%;background:#5ce08a;box-shadow:0 0 9px #5ce08a;
  animation:pulse 1.8s var(--ease) infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.25}}
.gantry__screen{
  flex:1;min-width:0;padding:9px 0;background:#060608;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 40px,#000 calc(100% - 40px),transparent);
  mask-image:linear-gradient(90deg,transparent,#000 40px,#000 calc(100% - 40px),transparent);
}
.gantry__screen canvas{display:block;width:100%}
@media (max-width:720px){ .gantry__board{max-width:100vw;border-radius:0} }

/* --- ヘッダー --- */
.top{
  position:absolute; top:104px; left:0; right:0;
  display:flex; align-items:center; gap:20px;
  padding:0 var(--gut);
}
.top__brand{display:flex;align-items:center;gap:8px;font-family:var(--ff-en);font-weight:700;font-size:18px;margin-right:auto}
.top__nav{display:flex;gap:1px;flex-wrap:wrap}
.top__nav a{
  display:flex;align-items:baseline;gap:5px;padding:5px 10px;
  font-size:12.5px;color:var(--dim);border-radius:99px;
  transition:background .3s,color .3s;
}
.top__nav a em{font-family:var(--ff-m);font-style:normal;font-size:9px;color:var(--mute)}
.top__nav a:hover{background:rgba(255,255,255,.6);color:var(--ink)}
.top__nav a.is-on{background:var(--ink);color:#fff}
.top__nav a.is-on em{color:var(--red)}
.top__acts{display:flex;align-items:center;gap:8px}
.top__mode{
  font-family:var(--ff-m);font-size:10px;letter-spacing:.08em;color:var(--dim);
  padding:7px 13px;border:1px solid var(--line);border-radius:99px;background:rgba(255,255,255,.6);
}
.top__mode:hover{border-color:var(--line2);color:var(--ink)}
.top__cta{
  padding:8px 18px;border-radius:99px;background:var(--ink);color:var(--paper);
  font-size:12.5px;font-weight:700;
}
.top__cta:hover{background:var(--red)}
@media (max-width:900px){ .top__nav{display:none} .top{top:92px} }

/* --- 計器 --- */
.dash{
  position:absolute; left:var(--gut); bottom:clamp(14px,3vh,28px);
  display:flex; align-items:center; gap:14px;
  padding:11px 20px 11px 13px;
  background:rgba(255,255,255,.82);
  border:1px solid var(--line); border-radius:99px;
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  box-shadow:0 10px 30px rgba(11,12,14,.12);
}
.dash__wheel{width:44px;height:44px;flex:none}
.dash__wheel svg{width:100%;height:100%;transform-origin:50% 50%;will-change:transform}
.w-ring{fill:none;stroke:var(--ink);stroke-width:3}
.w-spoke{stroke:var(--ink);stroke-width:3;stroke-linecap:round}
.w-hub{fill:var(--ink)}
.w-mark{stroke:var(--red);stroke-width:4;stroke-linecap:round}
.dash__tach{width:56px;height:56px;flex:none}
.dash__tach svg{width:100%;height:100%;overflow:visible}
.dash__tach .tc-num,.dash__tach .tc-unit,.dash__tach .tc-tick:not(.is-maj){display:none}
.dash__tach .tc-digits{font-size:58px}
.dash__read{display:flex;gap:14px}
.dash__read>div{display:flex;flex-direction:column;gap:1px;min-width:32px}
.dash__read dt{font-family:var(--ff-m);font-size:7.5px;letter-spacing:.14em;color:var(--mute)}
.dash__read dd{margin:0;font-family:var(--ff-m);font-size:13px;line-height:1.2;font-variant-numeric:tabular-nums}
.dash__read small{font-size:8.5px;color:var(--mute);margin-left:2px}
.dash__help{font-size:10.5px;color:var(--mute);border-left:1px solid var(--line);padding-left:14px}
.dash__help b{font-family:var(--ff-m);font-size:10px;color:var(--ink);font-weight:500}
@media (max-width:900px){ .dash__help{display:none} .dash{gap:11px;padding:9px 15px 9px 10px} }
@media (max-width:560px){ .dash__read>div:last-child{display:none} }

/* --- 進行度 --- */
.rail{
  position:absolute; right:calc(var(--gut) * .55); top:22vh; bottom:22vh; width:1px;
  background:var(--line);
}
.rail i{position:absolute;inset:0 0 auto 0;height:0;background:var(--red)}
.rail span{
  position:absolute;left:50%;width:7px;height:7px;border-radius:50%;
  background:var(--red);transform:translate(-50%,-50%);
}
@media (max-width:900px){ .rail{display:none} }


/* ============================================================
   道沿いの地点（走行時は重ねて表示）
   ============================================================ */

.road{position:fixed;inset:0;z-index:15;pointer-events:none}

.st{
  position:absolute; inset:0;
  display:flex; align-items:center;
  padding:0 var(--gut);
  opacity:0; visibility:hidden;
  transition:opacity .55s var(--ease),visibility .55s;
}
.st:nth-child(even){justify-content:flex-end}
.st.is-in{opacity:1;visibility:visible}
.st.is-in .st__box{transform:none;opacity:1}

.st__box{
  position:relative;
  pointer-events:auto;
  width:min(560px,100%);
  padding:clamp(22px,2.6vw,34px);
  background:rgba(255,255,255,.92);
  border:1px solid var(--line);
  border-radius:3px;
  box-shadow:0 30px 70px rgba(11,12,14,.16);
  backdrop-filter:blur(16px); -webkit-backdrop-filter:blur(16px);
  transform:translateY(22px); opacity:0;
  clip-path:inset(0 0 100% 0);
  transition:transform .8s var(--ease),opacity .5s var(--ease),clip-path .9s var(--ease);
}
.st.is-in .st__box{clip-path:inset(0 0 0 0)}

/* 左端に赤い線が走る */
.st__box::before{
  content:""; position:absolute; left:-1px; top:0; width:2px; height:0;
  background:var(--red);
  transition:height 1s var(--ease) .15s;
}
.st.is-in .st__box::before{height:100%}

/* 隅の目印 */
.st__box::after{
  content:""; position:absolute; right:-1px; bottom:-1px;
  width:16px; height:16px;
  border-right:1px solid var(--line2); border-bottom:1px solid var(--line2);
  opacity:0; transition:opacity .6s var(--ease) .4s;
}
.st.is-in .st__box::after{opacity:1}

/* 中身は少し遅れて上がってくる */
.st__box>*{
  transform:translateY(14px); opacity:0;
  transition:transform .7s var(--ease),opacity .7s var(--ease);
}
.st.is-in .st__box>*{transform:none;opacity:1}
.st.is-in .st__box>*:nth-child(2){transition-delay:.06s}
.st.is-in .st__box>*:nth-child(3){transition-delay:.12s}
.st.is-in .st__box>*:nth-child(4){transition-delay:.18s}
.st.is-in .st__box>*:nth-child(5){transition-delay:.24s}
.st.is-in .st__box>*:nth-child(6){transition-delay:.30s}
.st__box--wide{width:min(760px,100%)}

.st__eyebrow{
  display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-family:var(--ff-m);font-size:11px;letter-spacing:.1em;color:var(--dim);margin-bottom:18px;
}
.st__eyebrow em{
  font-style:normal;padding:3px 9px;border-radius:99px;
  border:1px solid rgba(255,31,31,.45);color:var(--red);
}
.st__h1{font-size:clamp(32px,5.4vw,62px);line-height:1.02;letter-spacing:-.04em;font-weight:900}
.st__h1 span{display:block}
.st__lead{margin-top:20px;color:var(--dim);font-size:14.5px}
.st__lead b{color:var(--ink);font-weight:700}
.st__go{margin-top:24px;font-family:var(--ff-m);font-size:11px;letter-spacing:.1em;color:var(--red)}

.st__no{font-family:var(--ff-m);font-size:10.5px;letter-spacing:.18em;color:var(--red);margin-bottom:14px}
.st__h{font-size:clamp(22px,3vw,36px);line-height:1.2;letter-spacing:-.035em;font-weight:900}
.st__h2{font-size:clamp(30px,5vw,58px);line-height:1.04;letter-spacing:-.04em;font-weight:900}
.st__d{margin-top:16px;color:var(--dim);font-size:14px}
.st__d b{color:var(--ink);font-weight:700}

.st__list{margin-top:20px;border-top:1px solid var(--ink)}
.st__list>div{display:flex;justify-content:space-between;gap:16px;padding:11px 0;border-bottom:1px solid rgba(11,12,14,.08)}
.st__list dt{font-family:var(--ff-m);font-size:9.5px;letter-spacing:.14em;color:var(--mute);flex:none}
.st__list dd{margin:0;font-size:13px;text-align:right}

.st__tags{display:flex;flex-wrap:wrap;gap:5px;margin-top:20px}
.st__tags li{font-family:var(--ff-m);font-size:10px;padding:4px 10px;border:1px solid var(--line);border-radius:99px;color:var(--dim)}

.st__steps{margin-top:18px;display:flex;flex-direction:column}
.st__steps li{display:flex;gap:14px;align-items:baseline;padding:10px 0;border-bottom:1px solid rgba(11,12,14,.08);font-size:13.5px}
.st__steps b{font-family:var(--ff-m);font-size:10px;color:var(--red);flex:none}

.st__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:20px;background:var(--line);border:1px solid var(--line)}
.st__grid li{background:rgba(255,255,255,.92);padding:16px 14px}
.st__grid b{font-family:var(--ff-m);font-size:9.5px;letter-spacing:.14em;color:var(--red)}
.st__grid h3{font-size:14px;margin:8px 0 5px}
.st__grid p{font-size:12px;color:var(--dim);line-height:1.7}
@media (max-width:640px){ .st__grid{grid-template-columns:1fr 1fr} }

.st__rows{margin-top:18px;border-top:1px solid var(--ink)}
.st__rows li{
  display:grid;grid-template-columns:58px 1fr auto;gap:14px;align-items:baseline;
  padding:12px 0;border-bottom:1px solid rgba(11,12,14,.08);
}
.st__rows b{font-family:var(--ff-m);font-size:9.5px;letter-spacing:.1em;color:var(--mute)}
.st__rows h3{font-size:14.5px}
.st__rows p{grid-column:2;font-size:12px;color:var(--dim);margin-top:3px}
.st__rows i{
  font-style:normal;font-family:var(--ff-m);font-size:9px;letter-spacing:.1em;
  padding:3px 9px;border-radius:99px;border:1px solid var(--line);color:var(--dim);white-space:nowrap;
}
.st__rows i.is-w{border-color:rgba(255,31,31,.4);color:var(--red)}
@media (max-width:560px){ .st__rows li{grid-template-columns:52px 1fr} .st__rows i{grid-column:2;justify-self:start;margin-top:8px} }

.st__acts{margin-top:26px}
.btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:15px 30px;border-radius:99px;background:var(--ink);color:var(--paper);
  font-size:14px;font-weight:700;transition:background .35s;
}
.btn i{width:7px;height:7px;border-radius:50%;background:var(--red-pure);display:block;transition:transform .35s var(--ease)}
.btn:hover{background:var(--red)}
.btn:hover i{background:#fff;transform:scale(1.5)}
.st__note{margin-top:12px;font-size:11.5px;color:var(--mute)}
.st__legal{margin-top:24px;padding-top:16px;border-top:1px solid var(--line);font-size:11px;color:var(--mute);line-height:1.8}


/* ============================================================
   読むだけ表示
   ============================================================ */

body.is-reading .stage,
body.is-reading .dash,
body.is-reading .rail,

body.is-reading .scroller{display:none}
body.is-reading .ui{position:static;pointer-events:auto}
body.is-reading .gantry{position:sticky;top:0;z-index:30}
body.is-reading .top{position:sticky;top:64px;padding-top:14px;padding-bottom:14px;background:rgba(242,242,240,.9);backdrop-filter:blur(12px)}
body.is-reading .road{position:static;pointer-events:auto}

body.is-reading .st{
  position:static;opacity:1;visibility:visible;display:block;
  padding:clamp(48px,8vh,110px) var(--gut);
  border-bottom:1px solid var(--line);
}
body.is-reading .st__box{
  transform:none;opacity:1;width:min(860px,100%);margin:0 auto;
  background:transparent;border:0;box-shadow:none;backdrop-filter:none;padding:0;
  clip-path:none;
}
body.is-reading .st__box::before,
body.is-reading .st__box::after{display:none}
body.is-reading .st__box>*{transform:none;opacity:1}
body.is-reading .st--hero{padding-top:clamp(80px,14vh,160px)}


/* ============================================================
   カーソル
   ============================================================ */

.cursor{position:fixed;inset:0;z-index:400;pointer-events:none;mix-blend-mode:difference}
.cursor i,.cursor b{
  position:absolute;top:0;left:0;border-radius:50%;
  transform:translate(-50%,-50%);will-change:transform;display:block;
}
.cursor b{width:5px;height:5px;background:#fff}
.cursor i{
  width:34px;height:34px;border:1px solid rgba(255,255,255,.7);
  transition:width .3s var(--ease),height .3s var(--ease);
}
.cursor.is-link i{width:58px;height:58px}
html.has-cursor,html.has-cursor a,html.has-cursor button{cursor:none}
@media (hover:none),(pointer:coarse){.cursor{display:none}}


/* ============================================================
   モーション抑制
   ============================================================ */

@media (prefers-reduced-motion:reduce){
  html.is-ready{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .st__box,.st__box>*{clip-path:none!important;transform:none!important;opacity:1!important}
  .cursor{display:none}
}