@import url('https://fonts.googleapis.com/css2?family=Roboto+Flex:opsz,wdth,wght@8..144,25..151,100..1000&family=Zen+Kaku+Gothic+New:wght@500;700;900&family=Shippori+Mincho:wght@700;800&display=swap');

:root{
  --bg0:#04060f;
  --bg1:#070b1d;
  --ink:#eaf6ff;
  --dim:#8fa3c8;
  --cyan:#00f0ff;
  --magenta:#ff2d78;
  --yellow:#f9f002;
  --violet:#7b5cff;
  --panel:rgba(10,16,38,.78);
  --line:rgba(0,240,255,.22);
  --depth:18; /* 0..100, set from JS */
  --wght:335;
  --wdth:114;
  --wob:3px;
  --glow:0.55;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255,45,120,.14), transparent 60%),
    radial-gradient(1000px 700px at 10% 0%, rgba(0,240,255,.12), transparent 60%),
    linear-gradient(180deg, #0a1030 0%, var(--bg1) 30%, var(--bg0) 100%);
  color:var(--ink);
  font-family:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN",system-ui,sans-serif;
  min-height:100vh;
  overflow-x:hidden;
}
.scanlines,.vignette{position:fixed;inset:0;pointer-events:none;z-index:50}
.scanlines{background:repeating-linear-gradient(180deg, rgba(255,255,255,.028) 0 1px, transparent 1px 3px);mix-blend-mode:overlay}
.vignette{background:radial-gradient(120% 90% at 50% 40%, transparent 55%, rgba(0,0,10,.55) 100%)}

/* ---------- header ---------- */
.topbar{
  display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
  padding:18px clamp(16px,4vw,44px) 8px;
}
.brand{display:flex;gap:14px;align-items:center}
.brand-kanji{
  writing-mode:vertical-rl;font-weight:900;font-size:22px;letter-spacing:4px;
  color:var(--bg0);background:linear-gradient(180deg,var(--cyan),#7df9ff);
  padding:10px 6px;border-radius:6px;box-shadow:0 0 18px rgba(0,240,255,.55);
}
.logo{margin:0;font-size:clamp(26px,4.6vw,44px);line-height:.95;letter-spacing:.04em;font-weight:900;
  text-shadow:0 0 22px rgba(0,240,255,.45)}
.logo span{color:transparent;-webkit-text-stroke:1.5px var(--magenta);text-shadow:0 0 22px rgba(255,45,120,.6)}
.tagline{margin:4px 0 0;color:var(--dim);font-size:12.5px;letter-spacing:.08em}
.top-actions{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  font:inherit;font-weight:700;font-size:12px;letter-spacing:.08em;cursor:pointer;
  color:var(--ink);background:rgba(0,240,255,.08);border:1px solid var(--line);
  padding:9px 14px;border-radius:999px;transition:.18s;
}
.chip:hover{transform:translateY(-1px);box-shadow:0 0 14px rgba(0,240,255,.35)}
.chip[aria-pressed="true"]{background:rgba(0,240,255,.18)}
.chip.tide[aria-pressed="true"]{background:rgba(255,45,120,.22);border-color:rgba(255,45,120,.55);box-shadow:0 0 16px rgba(255,45,120,.45)}

/* ---------- layout ---------- */
#app{max-width:1060px;margin:0 auto;padding:10px clamp(14px,3.5vw,32px) 40px;display:grid;gap:18px}
.console{
  background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:clamp(14px,2.6vw,24px);backdrop-filter:blur(10px);
  box-shadow:0 0 0 1px rgba(0,0,0,.4), 0 18px 60px rgba(0,0,0,.45), inset 0 1px 0 rgba(0,240,255,.15);
  position:relative;overflow:hidden;
}
.console::before{content:"深度制御盤 · DEPTH CONTROL";position:absolute;top:0;left:0;right:0;
  font-size:10px;letter-spacing:.35em;color:var(--cyan);opacity:.7;
  border-bottom:1px solid var(--line);padding:6px 16px;background:rgba(0,240,255,.05)}
.readout{display:flex;align-items:center;gap:16px;margin:14px 0 12px;flex-wrap:wrap}
.depth-num{font-size:52px;font-weight:900;line-height:1;font-variant-numeric:tabular-nums;
  color:var(--yellow);text-shadow:0 0 18px rgba(249,240,2,.5)}
.depth-num small{font-size:16px;margin-left:4px;color:var(--dim)}
.zone{font-weight:900;letter-spacing:.12em;font-size:clamp(13px,2.6vw,18px);color:var(--cyan);text-shadow:0 0 14px rgba(0,240,255,.5)}
.var-read code{font-size:12px;color:var(--dim);letter-spacing:.06em}
.stamp{margin-left:auto;width:58px;height:58px;display:grid;place-items:center;text-align:center;
  font-weight:900;line-height:1.1;color:#ff5c8a;border:2px solid #ff5c8a;border-radius:8px;
  transform:rotate(6deg);opacity:.9;box-shadow:0 0 14px rgba(255,45,120,.35);background:rgba(255,45,120,.07);
  font-family:"Shippori Mincho",serif}
.field{display:block;margin:12px 0}
.label{display:block;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--dim);margin-bottom:6px}
.label em{font-style:normal;color:var(--cyan);opacity:.8;letter-spacing:.04em}
#textInput{
  width:100%;font:inherit;font-size:17px;color:var(--ink);
  background:#050914;border:1px solid var(--line);border-radius:10px;padding:12px 14px;outline:none;
  transition:.18s;
}
#textInput:focus{border-color:var(--cyan);box-shadow:0 0 0 2px rgba(0,240,255,.25), 0 0 18px rgba(0,240,255,.3)}
input[type="range"]{width:100%;appearance:none;height:34px;background:transparent;cursor:pointer;--p:18%}
input[type="range"]::-webkit-slider-runnable-track{height:10px;border-radius:99px;
  background:linear-gradient(90deg,var(--cyan) var(--p),#16224d var(--p));
  box-shadow:inset 0 0 0 1px rgba(0,240,255,.3), 0 0 12px rgba(0,240,255,.25)}
input[type="range"]::-webkit-slider-thumb{appearance:none;width:26px;height:26px;margin-top:-8px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%, #fff, var(--cyan) 45%, #036b78 85%);
  border:2px solid #eaffff;box-shadow:0 0 16px var(--cyan)}
input[type="range"]::-moz-range-track{height:10px;border-radius:99px;background:#16224d}
input[type="range"]::-moz-range-progress{height:10px;border-radius:99px;background:var(--cyan)}
input[type="range"]::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:var(--cyan);border:2px solid #eaffff;box-shadow:0 0 16px var(--cyan)}
.ticks{display:flex;justify-content:space-between;font-size:10px;color:var(--dim);letter-spacing:.1em;padding:0 2px}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.btn{
  font:inherit;font-weight:800;font-size:13px;letter-spacing:.08em;cursor:pointer;
  padding:12px 18px;border-radius:12px;color:var(--ink);
  background:rgba(123,92,255,.12);border:1px solid rgba(123,92,255,.5);transition:.18s;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(123,92,255,.35)}
.btn:active{transform:translateY(0) scale(.98)}
.btn.primary{background:linear-gradient(135deg,var(--magenta),var(--violet));border:none;
  box-shadow:0 8px 28px rgba(255,45,120,.4)}
.hint{font-size:12px;color:var(--dim);margin:10px 0 0;letter-spacing:.03em}

/* ---------- ocean stage ---------- */
.ocean{
  position:relative;overflow:hidden;border-radius:18px;min-height:440px;
  border:1px solid rgba(0,240,255,.3);
  background:
    radial-gradient(700px 320px at 50% -60px, rgba(180,250,255,.5), transparent 65%),
    linear-gradient(180deg,
      hsl(210, 80%, calc(32% - var(--depth) * 0.24%)) 0%,
      hsl(225, 75%, calc(20% - var(--depth) * 0.14%)) 45%,
      hsl(245, 80%, calc(10% - var(--depth) * 0.06%)) 100%);
  box-shadow:inset 0 0 120px rgba(0,0,20,.55), 0 20px 70px rgba(0,0,0,.5);
  cursor:crosshair;
  transition:background .2s linear;
  display:grid;place-items:center;padding:70px 18px 90px;text-align:center;
}
.sun{position:absolute;top:26px;left:50%;transform:translateX(-50%);width:150px;height:150px;border-radius:50%;
  background:radial-gradient(circle,#fff 0%,#bffaff 30%,rgba(0,240,255,.55) 55%,transparent 72%);
  filter:blur(calc(var(--depth) * 0.08px));opacity:calc(1 - var(--depth) / 130);pointer-events:none}
.godrays{position:absolute;inset:0;pointer-events:none;opacity:calc(.8 - var(--depth) / 140);
  background:conic-gradient(from 180deg at 50% -10%, transparent 0 8deg, rgba(180,250,255,.14) 10deg 14deg, transparent 16deg 26deg, rgba(180,250,255,.1) 28deg 31deg, transparent 33deg 46deg, rgba(180,250,255,.12) 48deg 52deg, transparent 54deg 360deg)}
.torii{position:absolute;bottom:44px;right:14px;font-size:64px;opacity:.16;filter:saturate(2) hue-rotate(-20deg);pointer-events:none}
.vertical-jp{position:absolute;top:18px;writing-mode:vertical-rl;font-weight:700;letter-spacing:.4em;font-size:12px;color:rgba(234,246,255,.65);text-shadow:0 0 10px rgba(0,240,255,.6);pointer-events:none;z-index:3}
.vertical-jp.left{left:12px}.vertical-jp.right{right:12px}
.headline{
  position:relative;z-index:2;max-width:15ch;outline:none;
  font-family:"Roboto Flex","Zen Kaku Gothic New",sans-serif;
  font-size:clamp(44px,11vw,118px);line-height:1.02;letter-spacing:.01em;
  font-variation-settings:"wght" var(--wght),"wdth" var(--wdth);
  font-weight:900;
  color:#fff;
  text-shadow:0 0 calc(10px + var(--glow) * 26px) rgba(0,240,255,.75), 0 4px 0 rgba(255,45,120,.55), 0 10px 40px rgba(0,0,0,.6);
  caret-color:var(--yellow);
  filter:blur(calc(var(--depth) * 0.006px));
}
.headline .ch{display:inline-block;white-space:pre;will-change:transform}
.headline:focus{box-shadow:0 0 0 2px rgba(249,240,2,.5);border-radius:8px}
.subline{position:relative;z-index:2;margin-top:14px;font-size:12px;letter-spacing:.3em;color:var(--yellow);opacity:.85;text-shadow:0 0 12px rgba(249,240,2,.5)}
#bubbles{position:absolute;inset:0;width:100%;height:100%;z-index:1}
.click-tip{position:absolute;bottom:52px;left:50%;transform:translateX(-50%);z-index:2;font-size:11px;letter-spacing:.3em;color:rgba(234,246,255,.6);pointer-events:none;animation:bob 2.6s ease-in-out infinite}
.caution{position:absolute;bottom:12px;left:0;right:0;z-index:2;font-size:11px;font-weight:700;letter-spacing:.25em;color:var(--yellow);background:repeating-linear-gradient(-45deg,rgba(249,240,2,.14) 0 12px,rgba(0,0,0,.35) 12px 24px);padding:7px;border-top:1px solid rgba(249,240,2,.4);border-bottom:1px solid rgba(249,240,2,.4)}
@keyframes bob{0%,100%{opacity:.35}50%{opacity:.9}}

/* ---------- cards / footer ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.card{background:var(--panel);border:1px solid rgba(255,45,120,.25);border-radius:14px;padding:16px 16px 14px;transition:.2s}
.card:nth-child(odd){border-color:var(--line)}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(0,0,0,.45)}
.card h2{margin:0 0 6px;font-size:13px;letter-spacing:.18em;color:var(--cyan)}
.card:nth-child(even) h2{color:#ff7aa5}
.card p{margin:0;font-size:13.5px;color:#c6d4f2;line-height:1.55}
.card b{color:var(--yellow)}.card i{color:var(--cyan)}
.foot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:11px;letter-spacing:.12em;color:var(--dim);padding:4px 2px 10px}
.foot-jp{color:var(--magenta)}

@media (max-width:480px){
  .depth-num{font-size:40px}
  .stamp{display:none}
  .ocean{min-height:380px;padding:60px 10px 84px}
  .vertical-jp{font-size:10px}
  .torii{font-size:44px}
}
@media (prefers-reduced-motion:reduce){
  .click-tip{animation:none}
}