/* Lunabit TOP「月の実験室」 v4 */
:root{
  --navy:#1d2a5c;
  --ivory:#f6f1e6;
  --red:#ed282c;
  --blue:#2364e8;
  --fg:var(--navy);
  --card:var(--ivory);
  --line:var(--navy);
  --shadow:var(--navy);
  --muted:rgba(29,42,92,.72);
  --font:'IBM Plex Sans JP','Hiragino Kaku Gothic ProN','Yu Gothic',sans-serif;
  --display:'Zen Maru Gothic','IBM Plex Sans JP','Hiragino Maru Gothic ProN','Yu Gothic',sans-serif;
}
body.night{
  --fg:var(--ivory);
  --card:#223266;
  --line:var(--ivory);
  --shadow:#0b1130;
  --muted:rgba(246,241,230,.72);
}
*{box-sizing:border-box}
html,body{margin:0}
body{font:400 15px/1.8 var(--font);color:var(--fg);background:#5fb0ff;min-height:100svh;display:flex;flex-direction:column;overflow-x:hidden;transition:color .6s;-webkit-font-smoothing:antialiased}
a{color:inherit}
button{font:inherit;cursor:pointer}
.skip{position:absolute;left:-999px;top:8px;background:var(--navy);color:var(--ivory);padding:8px 14px;border-radius:999px;z-index:10}
.skip:focus{left:8px}

/* ---------- 空 ---------- */
.sky{position:fixed;inset:0;z-index:-1;overflow:hidden}
.sky>div{position:absolute;inset:0;transition:opacity .05s linear}
.sky-day{background:linear-gradient(180deg,#5fb0ff 0%,#9fd3ff 55%,#e3f3ff 100%)}
.sky-dusk{background:linear-gradient(180deg,#3f4bbd 0%,#9a6fc9 40%,#f08f8f 72%,#ffc07a 100%);opacity:0}
.sky-night{background:linear-gradient(180deg,#070c24 0%,#131d4d 55%,#263677 100%);opacity:0}
.stars{opacity:0}
.star{position:absolute;width:3px;height:3px;border-radius:50%;background:#fff;animation:twinkle 3s ease-in-out infinite}
@keyframes twinkle{0%,100%{opacity:.35;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}}
.clouds{pointer-events:none}
.cloud{position:absolute;width:180px;height:60px;background:#fff;border-radius:60px;opacity:.9;animation:drift linear infinite}
.cloud::before,.cloud::after{content:"";position:absolute;background:#fff;border-radius:50%}
.cloud::before{width:80px;height:80px;left:30px;top:-38px}
.cloud::after{width:60px;height:60px;left:90px;top:-24px}
@keyframes drift{from{transform:translateX(-260px)}to{transform:translateX(110vw)}}

/* ---------- ヘッダー ---------- */
header{display:flex;justify-content:space-between;align-items:center;padding:18px 28px 10px;max-width:1180px;width:100%;margin:0 auto;flex:none}
.brand img{display:block;height:30px;width:auto;transition:filter .6s}
body.night .brand img{filter:invert(.94)}
.about{font-size:14px;font-weight:700;font-family:var(--display);text-decoration:none;padding:8px 16px;border:2px solid var(--line);border-radius:999px;transition:.3s}
.about:hover{background:var(--card)}

/* ---------- ヒーロー ---------- */
.hero{max-width:1180px;width:100%;margin:0 auto;padding:0 28px 12px;display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center;flex:1;min-height:0}
h1{font-family:var(--display);font-size:clamp(38px,5.4vw,66px);line-height:1.22;margin:0 0 18px;font-weight:700;letter-spacing:.01em}
.tagline{font-family:var(--display);font-size:clamp(16px,1.6vw,20px);font-weight:700;margin:0 0 10px}
.lead{margin:0 0 30px;max-width:30em;color:var(--muted)}

/* 3つの入口 */
.doors{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:560px}
.door{display:flex;flex-direction:column;gap:4px;padding:16px 16px 14px;border:3px solid var(--line);border-radius:22px;background:var(--card);color:var(--fg);text-decoration:none;box-shadow:0 6px 0 var(--shadow);transition:transform .15s,box-shadow .15s,background .4s,border-color .4s}
.door:hover{transform:translateY(-3px);box-shadow:0 9px 0 var(--shadow)}
.door:active{transform:translateY(4px);box-shadow:0 2px 0 var(--shadow)}
.door:focus-visible{outline:3px solid var(--red);outline-offset:3px}
.door .dot{width:30px;height:30px;border-radius:9px;border:3px solid var(--line);margin-bottom:6px}
.door .dot.ivory{background:var(--ivory)}
.door .dot.red{background:var(--red)}
.door .dot.blue{background:var(--blue)}
.door strong{font-family:var(--display);font-size:21px;line-height:1.2}
.door small{font-size:12px;color:var(--muted);line-height:1.4}

/* ---------- 太陽と月 ---------- */
.scene{position:relative;display:flex;flex-direction:column;align-items:center;gap:22px;justify-content:center}
.orb-wrap{width:240px;height:240px;perspective:900px;animation:breathe 4.5s ease-in-out infinite;cursor:pointer;border:0;background:none;padding:0;border-radius:50%}
.orb-wrap:focus-visible{outline:3px solid var(--red);outline-offset:6px}
.orb-wrap.boing{animation:jelly .7s cubic-bezier(.3,1.6,.5,1)}
@keyframes breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.03,.97)}}
@keyframes jelly{0%{transform:scale(1)}25%{transform:scale(1.18,.84)}50%{transform:scale(.9,1.12)}75%{transform:scale(1.06,.95)}100%{transform:scale(1)}}
.orb{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .95s cubic-bezier(.34,1.56,.64,1)}
body.night .orb{transform:rotateY(180deg)}
.face{position:absolute;inset:0;border-radius:50%;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.sun{background:radial-gradient(circle at 36% 30%,#fff9d0 0,#ffe066 32%,#ffbf3f 62%,#ff9a36 100%);box-shadow:inset -16px -22px 34px rgba(220,110,30,.38),inset 10px 12px 22px rgba(255,255,255,.55),0 26px 60px rgba(255,170,60,.45)}
.sun::after{content:"";position:absolute;left:18%;top:14%;width:34%;height:22%;border-radius:50%;background:rgba(255,255,255,.55);filter:blur(5px)}
.moon{transform:rotateY(180deg);filter:drop-shadow(0 22px 40px rgba(246,241,230,.28))}
.moon svg{width:100%;height:100%;display:block}

/* スライダー（文字なし） */
.timebar{display:flex;align-items:center;gap:14px;width:min(360px,100%)}
.timebar svg{width:26px;height:26px;flex:none;color:var(--fg);transition:color .6s}
.time{-webkit-appearance:none;appearance:none;width:100%;height:16px;border-radius:999px;background:var(--card);border:3px solid var(--line);outline:none;margin:0;transition:background .4s,border-color .4s}
.time::-webkit-slider-thumb{-webkit-appearance:none;width:44px;height:44px;border-radius:50%;background:var(--ivory);border:3px solid var(--navy);box-shadow:0 5px 0 var(--navy);cursor:grab;transition:transform .15s}
.time::-webkit-slider-thumb:active{cursor:grabbing;transform:scale(1.08)}
.time::-moz-range-thumb{width:38px;height:38px;border-radius:50%;background:var(--ivory);border:3px solid var(--navy);box-shadow:0 5px 0 var(--navy);cursor:grab}
.time:focus-visible{box-shadow:0 0 0 4px rgba(237,40,44,.5)}

/* ---------- ガチャ（遊び） ---------- */
.gacha-wrap{display:flex;align-items:flex-end;gap:12px;align-self:flex-end;margin-top:-4px}
.gacha{position:relative;width:96px}
.dome{width:96px;height:78px;border:3px solid var(--line);border-bottom:0;border-radius:48px 48px 10px 10px;background:rgba(255,255,255,.35);overflow:hidden;position:relative;transition:border-color .4s}
.dome i{position:absolute;width:22px;height:22px;border-radius:50%;background:var(--ivory);border:2px solid var(--navy)}
.dome i:nth-child(1){left:10px;bottom:4px}.dome i:nth-child(2){left:36px;bottom:2px;background:var(--red)}.dome i:nth-child(3){left:60px;bottom:6px;background:var(--blue)}.dome i:nth-child(4){left:24px;bottom:24px;background:var(--red)}.dome i:nth-child(5){left:50px;bottom:26px}
.body{height:66px;border:3px solid var(--line);border-radius:10px 10px 16px 16px;background:var(--card);box-shadow:0 6px 0 var(--shadow);position:relative;transition:background .4s,border-color .4s}
.knob{position:absolute;left:50%;top:10px;width:36px;height:36px;margin-left:-18px;border-radius:50%;background:var(--ivory);border:3px solid var(--navy);box-shadow:0 3px 0 var(--navy);transition:transform .7s cubic-bezier(.34,1.56,.64,1)}
.knob::before{content:"";position:absolute;left:50%;top:4px;width:4px;height:22px;margin-left:-2px;border-radius:2px;background:var(--navy)}
.knob::after{content:"";position:absolute;inset:-7px;border-radius:50%} /* 見た目を変えずに押せる範囲を44px以上に */
.knob:focus-visible{outline:3px solid var(--red);outline-offset:3px}
.slot{position:absolute;left:50%;bottom:-2px;width:34px;height:12px;margin-left:-17px;border-radius:0 0 8px 8px;background:var(--navy);transition:background .4s}
.capsule{position:absolute;left:50%;bottom:-24px;width:26px;height:26px;margin-left:-13px;border-radius:50%;background:var(--ivory);border:3px solid var(--navy);opacity:0;pointer-events:none}
.capsule.drop{animation:drop .7s cubic-bezier(.3,1.4,.5,1) forwards}
@keyframes drop{0%{opacity:0;transform:translateY(-28px) scale(.6)}30%{opacity:1}100%{opacity:1;transform:translateY(0) scale(1)}}
.fortune{width:236px;padding:12px 16px;border:3px solid var(--line);border-radius:18px 18px 18px 4px;background:var(--card);box-shadow:0 6px 0 var(--shadow);font-family:var(--display);font-weight:700;font-size:15px;line-height:1.55;opacity:0;transform:translateY(8px) scale(.96);transition:opacity .3s,transform .4s cubic-bezier(.34,1.56,.64,1),background .4s,border-color .4s}
.fortune.show{opacity:1;transform:none}

footer{max-width:1180px;width:100%;margin:0 auto;padding:10px 28px 18px;display:flex;justify-content:space-between;font-size:12px;color:var(--fg);flex:none}

/* PCの縦が短いとき（ノートPC等）も1画面に収める */
@media (min-width:901px) and (max-height:760px){
  h1{font-size:clamp(34px,4.4vw,52px);margin-bottom:12px}
  .lead{margin-bottom:18px}
  .orb-wrap{width:190px;height:190px}
  .scene{gap:14px}
  .door{padding:12px 14px 10px}
  .door strong{font-size:19px}
}
@media (min-width:901px) and (max-height:640px){
  .orb-wrap{width:150px;height:150px}
  .lead{display:none}
  .door small{display:none}
}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;gap:12px;min-height:0;padding-top:0;flex:none}
  .scene{order:-1;min-height:0;gap:18px}
  .orb-wrap{width:180px;height:180px}
  .gacha-wrap{margin-top:6px}
  .doors{grid-template-columns:repeat(3,1fr);gap:10px}
  .door{padding:12px 10px 10px;border-radius:18px}
  .door strong{font-size:17px}
  .door small{display:none}
  footer{flex-direction:column;gap:4px}
}
@media (prefers-reduced-motion:reduce){
  .orb-wrap,.cloud,.star{animation:none}
  .orb{transition:none}
}