:root { color-scheme: dark; --ink:#e9f0e8; --muted:#849ba0; --line:rgba(171,203,198,.19); --acid:#d8ff45; --deep:#06161c; }
* { box-sizing:border-box; }
html,body { margin:0; min-height:100%; background:#06171d; }
body { color:var(--ink); font-family:'Noto Sans JP',sans-serif; background:radial-gradient(circle at 70% 40%,#143941 0,#092129 38%,#06171d 72%); }
body::before { content:""; position:fixed; inset:0; pointer-events:none; opacity:.24; background-image:linear-gradient(rgba(255,255,255,.018) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px); background-size:38px 38px; }
.app-shell { width:min(1440px,100%); min-height:100vh; margin:auto; padding:0 52px; position:relative; }
.topbar { height:96px; border-bottom:1px solid var(--line); display:flex; align-items:center; justify-content:space-between; }
.brand { color:inherit; text-decoration:none; display:flex; align-items:center; gap:14px; font-family:'IBM Plex Mono',monospace; letter-spacing:.1em; }
.brand b { display:block; font-size:16px; line-height:1; }.brand small { display:block; color:var(--muted); font-size:8px; margin-top:6px; letter-spacing:.25em; }
.brand-mark { width:33px; height:33px; position:relative; display:block; }.brand-mark i { position:absolute; border:1px solid var(--acid); border-radius:50%; inset:4px; transform:rotateX(64deg); }.brand-mark i:nth-child(2){inset:9px 1px}.brand-mark i:nth-child(3){inset:14px -2px}
.status { font:500 9px/1 'IBM Plex Mono'; letter-spacing:.18em; display:flex; gap:10px; align-items:center; color:#a7babc; }.status>span:first-child { width:6px;height:6px;border-radius:50%;background:var(--acid);box-shadow:0 0 12px var(--acid);animation:pulse 1.7s infinite; }
@keyframes pulse { 50% { opacity:.25; } }
.hero { display:grid; grid-template-columns:minmax(180px, .65fr) minmax(430px,1.65fr) minmax(260px,.8fr); gap:38px; align-items:center; min-height:calc(100vh - 154px); padding:38px 0; }
.intro { align-self:start; padding-top:55px; z-index:2; }
.eyebrow { font:500 9px/1 'IBM Plex Mono'; letter-spacing:.18em; color:#91a5a7; display:flex; align-items:center; gap:10px; white-space:nowrap; }.eyebrow span { color:var(--acid); }
h1 { font-size:clamp(35px,3vw,48px); line-height:1.38; letter-spacing:.01em; margin:35px 0 30px; position:relative; z-index:3; font-weight:500; white-space:nowrap; }
h1 em { color:var(--acid); font-style:normal; }
.lead { color:#9aabad; font-size:12px; line-height:2.1; }
.interaction-words { color:var(--acid); font-weight:700; text-decoration:underline; text-decoration-color:rgba(216,255,69,.55); text-decoration-thickness:1px; text-underline-offset:5px; }
.simulator-wrap { min-width:0; }
.canvas-frame { position:relative; width:100%; aspect-ratio:1/1; border:1px solid rgba(184,214,211,.28); overflow:hidden; background:#09252e; box-shadow:0 32px 90px rgba(0,0,0,.3); touch-action:none; cursor:crosshair; }
.canvas-frame::before,.canvas-frame::after { content:""; position:absolute; pointer-events:none; z-index:3; }.canvas-frame::before { inset:14px; border:1px solid rgba(211,255,69,.16); }.canvas-frame::after { inset:0; background:linear-gradient(90deg,rgba(216,255,69,.5) 18px,transparent 18px) 0 0/38px 1px no-repeat,linear-gradient(rgba(216,255,69,.5) 18px,transparent 18px) 0 0/1px 38px no-repeat; }
canvas { width:100%;height:100%;display:block; }
canvas:focus-visible { outline:2px solid var(--acid); outline-offset:-2px; }
.canvas-hud { position:absolute; left:24px; bottom:19px; z-index:4; display:flex; gap:18px; font:400 8px/1 'IBM Plex Mono'; color:rgba(220,235,231,.55); letter-spacing:.08em; }.canvas-hud b{color:#d1e1dd;font-weight:400}.corner-label{position:absolute;right:20px;top:18px;text-align:right;z-index:4;font:500 7px/1.5 'IBM Plex Mono';letter-spacing:.18em;color:rgba(220,235,231,.42)}
.tap-hint { position:absolute; inset:50% auto auto 50%; transform:translate(-50%,-50%); z-index:4; font:500 8px/1 'IBM Plex Mono'; letter-spacing:.16em; color:rgba(225,240,236,.65); display:flex;align-items:center;gap:10px;transition:opacity .5s;white-space:nowrap}.tap-hint span{width:25px;height:25px;border:1px solid var(--acid);border-radius:50%;position:relative}.tap-hint span::after{content:"";position:absolute;inset:8px;border-radius:50%;background:var(--acid)}
.control-panel { border-left:1px solid var(--line); padding-left:30px; }
.panel-heading { display:flex; gap:16px; align-items:flex-start; padding-bottom:25px; border-bottom:1px solid var(--line); }.panel-number { color:var(--acid); font:500 11px/1 'IBM Plex Mono'; }.panel-heading p{margin:0 0 7px;color:#81979a;font:500 10px/1 'IBM Plex Mono';letter-spacing:.2em}.panel-heading h2{margin:0;font-size:21px;font-weight:500;letter-spacing:.08em}
fieldset { border:0; padding:25px 0 22px; margin:0; border-bottom:1px solid var(--line); }legend,.slider-group label { font:500 10px/1 'IBM Plex Mono';letter-spacing:.12em;color:#8ca0a2; }
.segmented{display:grid;grid-template-columns:1fr 1fr;margin-top:15px;border:1px solid var(--line);}.segmented label{cursor:pointer}.segmented input{position:absolute;opacity:0}.segmented span{display:block;padding:14px 13px;transition:.2s;border:1px solid transparent}.segmented label+label span{border-left-color:var(--line)}.segmented b,.segmented small{display:block}.segmented b{font:600 12px/1 'IBM Plex Mono';letter-spacing:.1em}.segmented small{font-size:11px;color:#829497;margin-top:8px}.segmented input:checked+span{border-color:var(--acid);background:rgba(216,255,69,.07);color:var(--acid)}.segmented input:focus-visible+span{outline:2px solid white;outline-offset:2px}.control-note{font-size:11px;color:#71878a;margin:11px 0 0;line-height:1.6}
.slider-group{padding-top:25px}.slider-group label{display:flex;justify-content:space-between}.slider-group output{color:var(--acid);font-size:12px}input[type=range]{width:100%;height:2px;accent-color:var(--acid);margin:15px 0 0;display:block;cursor:pointer}
.wave-size-control output{min-width:58px;text-align:right}.preset-scale{display:flex;align-items:center;justify-content:space-between;margin-top:9px;color:#657d80;font:500 9px/1 'IBM Plex Mono';letter-spacing:.08em}.preset-scale i{width:3px;height:3px;border-radius:50%;background:#657d80}.wave-size-control .control-note{margin-top:12px}
.actions{display:grid;grid-template-columns:1fr 1.3fr;gap:8px;margin-top:28px}.actions button{height:48px;border:1px solid var(--line);background:rgba(4,18,23,.5);color:#b7c6c5;cursor:pointer;font-family:inherit;font-size:12px;display:flex;align-items:center;justify-content:center;gap:9px;transition:.2s}.actions button:hover{border-color:var(--acid);color:var(--acid)}.pause-icon{width:9px;height:10px;border-left:2px solid currentColor;border-right:2px solid currentColor}.is-paused .pause-icon{width:0;border-right:0;border-left:9px solid currentColor;border-top:5px solid transparent;border-bottom:5px solid transparent}.clear-icon{font:20px/1 serif}.tip{display:flex;gap:12px;margin-top:26px;align-items:flex-start}.tip>span{color:var(--acid);border:1px solid rgba(216,255,69,.45);padding:4px;font:600 9px/1 'IBM Plex Mono'}.tip p{margin:0;color:#71878a;font:400 10px/1.8 'IBM Plex Mono';letter-spacing:.04em}.tip b{color:#9aadaf}
footer { height:58px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;color:#536c70;font:400 8px/1 'IBM Plex Mono';letter-spacing:.12em; }
@media(max-width:1000px){.app-shell{padding:0 28px}.hero{grid-template-columns:1fr 1fr}.intro{grid-column:1/-1;padding-top:10px}.intro h1{margin:18px 0 15px}.lead{position:absolute;right:28px;top:130px}.control-panel{padding-left:24px}}
@media(max-width:680px){.app-shell{padding:0 18px}.topbar{height:72px}.hero{display:block;padding:28px 0}.intro{padding:0}.intro h1{font-size:39px;line-height:1.3;margin:22px 0 15px}.lead{position:static;margin-bottom:24px}.control-panel{border-left:0;border-top:1px solid var(--line);padding:28px 0 0;margin-top:28px}footer{height:auto;padding:18px 0;gap:10px;flex-wrap:wrap}footer p:nth-child(2){display:none}.status{font-size:7px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}