:root{--bg:#ffffff;--text:#111;--muted:#666;--shadow: 0 10px 30px rgba(0,0,0,.08);--border: rgba(0,0,0,.08);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body{height:100%}body{margin:0;overflow:hidden;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Hiragino Sans,Noto Sans JP,Segoe UI,Roboto,Arial,sans-serif}#canvas-container{width:100vw;height:100vh;height:100dvh;position:absolute;inset:0;z-index:1}.exit-ui{position:fixed;left:0;right:0;bottom:calc(24px + var(--safe-bottom));z-index:10;display:flex;justify-content:center;pointer-events:none}.exit-btn{pointer-events:auto;display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 18px;border-radius:999px;border:1px solid var(--border);background:#fff9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow);cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;opacity:.8;transition:transform .15s ease,background .2s ease,opacity .2s ease}.exit-btn:hover{transform:translateY(-1px);background:#ffffffe6;opacity:1}.exit-btn,.exit-btn .exit-text{color:#1f2933}.exit-icon svg{fill:currentColor;transition:transform .2s ease}.exit-btn:hover .exit-icon svg{transform:scale(1.08)}.exit-text{font-size:11px;letter-spacing:.2em;font-weight:800}.overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:24px;background:#fff6;-webkit-backdrop-filter:blur(16px) saturate(1.1);backdrop-filter:blur(16px) saturate(1.1);opacity:0;pointer-events:none;transition:opacity .6s ease}.overlay.is-open{opacity:1;pointer-events:auto}.is-hidden{display:none!important}.overlay-card{width:min(560px,100%);text-align:center;background:#ffffff38;border:1px solid rgba(255,255,255,.5);border-radius:22px;box-shadow:0 24px 60px #00000029;padding:28px 22px;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.lang-switch{display:flex;justify-content:flex-end;align-items:center;gap:6px;margin-bottom:6px;font-size:11px;color:var(--muted)}.lang-btn{border:1px solid transparent;background:transparent;color:inherit;padding:6px 8px;border-radius:999px;cursor:pointer;letter-spacing:.08em;font-weight:700;transition:color .2s ease,background .2s ease,border-color .2s ease}.lang-btn:hover{color:#0f172a}.lang-btn.is-active{background:#fff9;border-color:#00000014;color:#0f172a;box-shadow:0 8px 18px #0000000f}.lang-divider{opacity:.6}.overlay-line{margin:0;color:#1f2937;font-size:clamp(18px,3vw,26px);letter-spacing:.08em}.overlay-time{margin:12px 0;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-weight:800;font-size:clamp(42px,5.6vw,60px);color:#0f172a}.overlay-unit{font-size:.66em}.overlay-sub{margin:14px 0 0;color:#374151;line-height:1.8;opacity:.95}.button-row{display:flex;justify-content:center;margin-top:18px}.app-version{display:inline-block;margin:8px 0 0;color:#6b728057;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-size:10px;line-height:1;letter-spacing:.04em;pointer-events:none;transform:scale(.48);transform-origin:center top;-webkit-user-select:none;user-select:none}.restart-btn{position:fixed;left:50%;bottom:calc(52px + var(--safe-bottom));transform:translate(-50%);display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:50%;border:1px solid rgba(0,0,0,.1);background:#fff9;color:#1f2933;cursor:pointer;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 10px 25px #00000014;opacity:0;visibility:hidden;pointer-events:none;filter:blur(8px);transform-origin:center;transition:transform .3s ease,background .2s ease,box-shadow .2s ease,opacity .3s ease,filter .3s ease,visibility 0s linear .3s;z-index:60}.restart-btn.is-visible{opacity:.8;visibility:visible;pointer-events:auto;filter:blur(0);transition:transform .3s ease,background .2s ease,box-shadow .2s ease,opacity .3s ease,filter .3s ease,visibility 0s}.restart-btn:hover{transform:translate(-50%) translateY(-1px) scale(1.04);background:#ffffffe6;box-shadow:0 14px 32px #0000001f}.restart-icon svg{fill:currentColor}.restart-icon img{width:28px;height:28px;display:block;transform-origin:center}.restart-btn.is-visible .restart-icon img{animation:restart-spin 12s linear infinite}@keyframes restart-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.svg-btn-rect{border:none;background:transparent;padding:0;cursor:pointer;display:inline-block;width:320px;height:72px;position:relative;filter:drop-shadow(0 14px 34px rgba(0,0,0,.18));perspective:800px}.svg-btn-rect:focus-visible{outline:2px solid rgba(31,41,51,.7);outline-offset:6px;border-radius:20px}.svg-btn-rect:before{content:"";position:absolute;inset:-10px;background:radial-gradient(120% 140% at 20% 30%,#ffffff59,#fff0),radial-gradient(120% 140% at 80% 70%,#bed2ff40,#fff0);filter:blur(18px) saturate(1.4);opacity:.8;mix-blend-mode:screen;pointer-events:none;z-index:0}.svg-btn-rect svg{width:100%;height:100%;overflow:visible;position:relative;z-index:1}.svg-btn-rect .glass-glow{fill:#ffffff2e;filter:blur(18px)}.svg-btn-rect .glass-rect{fill:#ffffff1f;stroke:#ffffff9e;stroke-width:1.7px;-webkit-backdrop-filter:blur(28px) saturate(1.5);backdrop-filter:blur(28px) saturate(1.5);filter:drop-shadow(0 8px 22px rgba(255,255,255,.28)) drop-shadow(0 14px 34px rgba(0,0,0,.12));transition:transform .25s ease,fill .25s ease,stroke .25s ease,opacity .25s ease,filter .25s ease}.svg-btn-rect .logo-wrap{pointer-events:none;transform-origin:center;transition:transform .25s ease}.svg-btn-rect:hover .glass-rect{transform:translateY(-1px) scale(1.015);fill:#fff3;stroke:#fffc;filter:drop-shadow(0 10px 26px rgba(255,255,255,.32)) drop-shadow(0 18px 40px rgba(0,0,0,.16))}.svg-btn-rect:hover .logo-wrap{transform:translateZ(8px) scale(1.03)}.fallback-overlay{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;padding:24px;background:#ffffffdb;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.fallback-text{margin:0;max-width:520px;text-align:center;color:#b45309;font-size:13px;line-height:1.7}.confirm-overlay{z-index:70}.confirm-card{width:min(420px,100%);padding:24px 20px}.confirm-actions{display:flex;gap:12px;justify-content:center;margin-top:18px}.confirm-btn{min-width:100px;padding:12px 16px;border-radius:999px;border:1px solid rgba(0,0,0,.08);background:#fff9;color:#1f2937;font-weight:700;letter-spacing:.08em;cursor:pointer;box-shadow:var(--shadow);transition:transform .15s ease,background .2s ease,opacity .2s ease,box-shadow .2s ease}.confirm-btn:hover{transform:translateY(-1px);background:#ffffffd9;box-shadow:0 16px 38px #0000001f}.confirm-btn-primary{background:linear-gradient(135deg,#ffffffd9,#ffffff8c);border-color:#1f29331f;color:#0f172a;box-shadow:0 18px 42px #0000001f,0 8px 22px #ffffff47}.confirm-btn-primary:hover{background:linear-gradient(135deg,#fffffff2,#ffffffa6)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}