:root{--bg: #050608;--panel: #0d1b2a;--panel-accent: #1b263b;--text-primary: #e0e8f9;--text-secondary: #9fb4d2;--accent: #19f9ff;--accent-warn: #ff3864;--grid-line: rgba(25, 249, 255, .12);--font-family: "Orbitron", "Segoe UI", sans-serif}@font-face{font-family:Orbitron;src:local("Orbitron"),url(https://fonts.gstatic.com/s/orbitron/v29/yMJRMIlzdpvBhQQL_Qq7dys.woff2) format("woff2");font-display:swap}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#0f2747,#050608 55%);color:var(--text-primary);font-family:var(--font-family);display:flex;align-items:center;justify-content:center;padding:2rem}.layout{width:min(960px,100%);background:#080c14f0;border:1px solid rgba(25,249,255,.2);border-radius:12px;box-shadow:0 0 24px #19f9ff2e;display:grid;grid-template-rows:auto 1fr auto}.hud{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem 1.25rem;border-bottom:1px solid rgba(25,249,255,.18);background:linear-gradient(90deg,#1b263b73,#080c1499)}.hud__title{margin:0;letter-spacing:.18em;font-size:clamp(1.75rem,2vw + 1rem,2.5rem);text-transform:uppercase}.hud__right{display:flex;align-items:center;gap:1.5rem}.scoreboard{display:flex;gap:1.5rem;font-size:.95rem}.scoreboard__item{min-width:120px;text-transform:uppercase;letter-spacing:.12em}.hud__button{background:transparent;color:var(--accent);border:1px solid rgba(25,249,255,.4);border-radius:6px;padding:.5rem 1.25rem;font-size:.9rem;font-family:inherit;cursor:pointer;transition:background .15s ease,box-shadow .15s ease}.hud__button:focus-visible,.hud__button:hover{background:#19f9ff14;box-shadow:0 0 12px #19f9ff66}.main{display:grid;gap:1.5rem;padding:1.75rem 2rem 2.5rem;grid-template-columns:minmax(0,640px) minmax(0,1fr)}#game-canvas{width:100%;border:1px solid rgba(25,249,255,.25);border-radius:8px;background:repeating-linear-gradient(0deg,rgba(25,249,255,.05),rgba(25,249,255,.05) 4px,transparent 4px,transparent 32px),#050608;box-shadow:inset 0 0 12px #0009}.instructions{background:#1b263b38;border:1px solid rgba(25,249,255,.18);border-radius:8px;padding:1.25rem 1.5rem}.instructions__title{margin:0 0 .75rem;text-transform:uppercase;letter-spacing:.1em;font-size:1rem;color:var(--accent)}.instructions__list{margin:0 0 1rem;padding-left:1.25rem;color:var(--text-secondary)}.instructions__list li{margin-bottom:.5rem}.instructions__note{margin:0;font-size:.85rem;color:var(--text-secondary)}.footer{text-align:center;padding:1rem 2rem 1.5rem;border-top:1px solid rgba(25,249,255,.18);color:var(--text-secondary);font-size:.9rem}@media(max-width:960px){body{padding:1rem}.layout{border-radius:0}.main{grid-template-columns:1fr;padding:1.5rem}#game-canvas{max-width:100%;margin:0 auto}.hud{flex-direction:column;align-items:flex-start;gap:1rem}.scoreboard{flex-direction:column;gap:.5rem}}