*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#021b2e;-webkit-tap-highlight-color:transparent}#root{height:100%}#app{position:relative;width:100vw;height:100vh;height:100dvh;overflow:hidden;-webkit-user-select:none;user-select:none}#game{display:block;width:100%;height:100%;touch-action:none}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(180deg,#021b2e8c,#010c16d9);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:10;animation:fade-in .4s ease}.panel{width:100%;max-width:440px;background:#062a46eb;border:1px solid rgba(120,200,255,.25);border-radius:20px;padding:32px 28px;text-align:center;color:#eaf6ff;box-shadow:0 18px 60px #00000080}.panel h1{font-size:2rem;margin-bottom:10px;color:#aee3ff;text-shadow:0 2px 12px rgba(80,180,255,.4)}.subtitle{font-size:1rem;line-height:1.5;opacity:.85;margin-bottom:20px}.how-to{list-style:none;text-align:left;margin:0 auto 24px;display:inline-block;font-size:.95rem;line-height:1.9;opacity:.92}.stat{font-size:1.1rem;margin-bottom:20px;color:#ffd76b}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;cursor:pointer;font-size:1.1rem;font-weight:700;color:#022036;background:linear-gradient(180deg,#8fe3ff,#4fb6f0);padding:14px 36px;border-radius:999px;box-shadow:0 8px 24px #4fb6f073;transition:transform .12s ease,box-shadow .12s ease}.btn:hover{transform:translateY(-2px);box-shadow:0 12px 30px #4fb6f099}.btn:active{transform:translateY(1px)}.letter-panel{background:#fffaf5f7;border-color:#ffb4c880;color:#4a2d33}.letter-panel h1{color:#d6537a;text-shadow:none}.chest-anim{font-size:3rem;margin-bottom:6px;animation:pop .6s ease}.love-letter{text-align:left;font-size:1.05rem;line-height:1.7;margin:18px 0 24px;font-family:Georgia,Times New Roman,serif}.love-letter p{margin-bottom:12px}.signature{text-align:right;font-style:italic;color:#d6537a}#hud{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;z-index:5;pointer-events:none}.meter{display:flex;align-items:center;gap:8px}.meter-label{font-size:.7rem;font-weight:800;letter-spacing:2px;color:#cdeaff}.meter-track{width:160px;max-width:40vw;height:14px;background:#00000059;border:1px solid rgba(160,220,255,.35);border-radius:999px;overflow:hidden}.meter-fill{height:100%;width:100%;background:linear-gradient(90deg,#67e8ff,#36b3ef);transition:width .1s linear,background .3s ease}.meter-fill.low{background:linear-gradient(90deg,#ff8a8a,#ff4d4d)}.depth{font-size:1.2rem;font-weight:800;color:#eaf6ff;text-shadow:0 2px 8px rgba(0,0,0,.5)}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}@keyframes pop{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.2)}to{transform:scale(1);opacity:1}}@media(max-width:480px){.panel h1{font-size:1.6rem}.panel{padding:24px 20px}}