:root {
  color-scheme: dark;
  --bg: #071019;
  --panel: #0e1a27;
  --ink: #effaff;
  --muted: #8ba5b5;
  --cyan: #20d9ff;
  --orange: #ff5b35;
  --line: #23394a;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body, #app { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { background: var(--bg); color: var(--ink); touch-action: none; overscroll-behavior: none; user-select: none; }
button, input { font: inherit; }
button { min-height: 46px; border: 1px solid var(--line); background: #0b1621; color: var(--ink); padding: .75rem 1rem; cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }
.hidden { display: none !important; }
canvas { position: absolute; inset: 0; width: 100%; height: 100%; touch-action: none; }

.screen {
  position: absolute; inset: 0; display: grid; grid-template-columns: minmax(280px, 480px) minmax(260px, 360px);
  gap: clamp(1rem, 5vw, 5rem); align-content: center; justify-content: center; padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) max(1rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  background: linear-gradient(105deg, rgba(7,16,25,.99), rgba(7,16,25,.9)); animation: enter .25s ease; z-index: 5;
}
.panel { max-width: 480px; }
.eyebrow, .instruction, .hud, .leaderboard, .status, label, input, .banner { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .08em; }
.eyebrow { color: var(--cyan); font-weight: 900; }
h1 { font-size: clamp(3rem, 6vw, 5rem); line-height: .82; margin: .15em 0; }
h1 span { color: var(--cyan); }
h2 { letter-spacing: .09em; }
.tagline { font-size: clamp(1.05rem, 2.4vw, 1.45rem); color: var(--muted); }
form { display: grid; gap: .6rem; margin: 2rem 0 1rem; }
input { width: 100%; background: #050b11; border: 1px solid var(--line); color: var(--ink); font-size: 1.1rem; padding: .85rem; }
input[aria-invalid="true"] { border-color: var(--orange); }
.error { min-height: 1.2em; color: #ff8065; margin: 0; }
.primary { border-color: var(--cyan); background: var(--cyan); color: #041019; font-weight: 900; letter-spacing: .08em; }
.instruction, .muted, .status { color: var(--muted); font-size: .75rem; }
.leaderboard-wrap { border-left: 1px solid var(--line); padding-left: 2rem; }
.board-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.leaderboard { list-style-position: inside; padding: 0; margin: 1rem 0; }
.leaderboard li { display: grid; grid-template-columns: 2.2rem 1fr auto auto; gap: .5rem; padding: .55rem 0; border-bottom: 1px solid var(--line); }
.leaderboard li.me { color: var(--cyan); }
.leaderboard .level-tag { color: var(--muted); font-size: .75em; }

.hud { position: absolute; z-index: 3; inset: max(.65rem, env(safe-area-inset-top)) .75rem auto; pointer-events: none; text-shadow: 0 2px 6px #000; }
.hud-row { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: .5rem; }
.hud-row > div { display: grid; }
.hud span { color: #a8c3d2; font-size: .58rem; }
.hud strong { font-size: clamp(.95rem, 3.5vw, 1.65rem); }
.base-health, .boss-hud { margin-top: .5rem; display: grid; grid-template-columns: 3.5rem 1fr; align-items: center; gap: .5rem; }
.base-health div, .boss-hud div { height: 8px; background: #203040; border: 1px solid #365064; }
.base-health i, .boss-hud i { display: block; width: 100%; height: 100%; background: var(--cyan); transition: width .15s; }
.boss-hud { position: absolute; top: 4.8rem; left: 15%; width: 70%; grid-template-columns: 1fr; text-align: center; }
.boss-hud i { background: var(--orange); }
.combo { position: absolute; right: .5rem; top: 5rem; color: var(--orange); font-size: 1.2rem; animation: pulse .2s ease; }

.upgrade-screen { position: absolute; inset: 0; z-index: 6; display: grid; place-content: center; text-align: center; padding: 1rem; background: rgba(4,10,16,.94); }
.upgrade-cards { display: grid; grid-template-columns: repeat(3, minmax(160px, 240px)); gap: 1rem; }
.upgrade-card { min-height: 190px; display: flex; flex-direction: column; justify-content: space-between; text-align: left; border-color: var(--cyan); background: linear-gradient(145deg, #12283a, #0b1621); }
.upgrade-card strong { color: var(--cyan); font: 900 1.15rem ui-monospace; }
.upgrade-card small { color: var(--muted); }
.banner { position: absolute; z-index: 4; top: 22%; left: 50%; transform: translateX(-50%); color: var(--ink); background: rgba(4,12,20,.85); border: 1px solid var(--cyan); padding: .8rem 1.4rem; font-size: clamp(1.1rem, 4vw, 2rem); font-weight: 900; white-space: nowrap; }
.giant { display: block; font: 900 clamp(3rem, 10vw, 6rem) ui-monospace; color: var(--cyan); }
dl { display: grid; grid-template-columns: 1fr auto; max-width: 400px; }
dt, dd { padding: .42rem 0; border-bottom: 1px solid var(--line); margin: 0; }
.actions { display: flex; gap: .75rem; margin-top: 1.5rem; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@keyframes enter { from { opacity: 0; transform: translateY(8px); } }
@keyframes pulse { 50% { transform: scale(1.08); } }
@media (max-width: 720px) {
  .screen { grid-template-columns: minmax(0, 1fr); align-content: start; overflow-y: auto; overflow-x: hidden; padding-top: 7vh; }
  .leaderboard-wrap { border-left: 0; border-top: 1px solid var(--line); padding: 1rem 0; }
  .leaderboard li { padding: .35rem 0; }
  h1 { font-size: clamp(2.5rem, 11vw, 4rem); }
  .upgrade-cards { grid-template-columns: 1fr; }
  .upgrade-card { min-height: 120px; }
}
@media (prefers-reduced-motion: reduce) { * { animation-duration: .001ms !important; transition-duration: .001ms !important; } }