:root {
  color-scheme: light;
  --paper: #f4f1e8;
  --ink: #111820;
  --muted: #5d6770;
  --line: #c6c1b5;
  --panel: #e9e5db;
  --blue: #005c9e;
  --red: #a62c2c;
  --green: #1e6b49;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, kbd { font: inherit; }

button {
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  padding: 0.75rem 1rem;
  font-weight: 750;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

button:hover:not(:disabled), button:focus-visible:not(:disabled) { background: var(--blue); }
button.secondary { background: transparent; color: var(--ink); }
button.secondary:hover:not(:disabled), button.secondary:focus-visible:not(:disabled) { color: var(--paper); }
button:disabled { cursor: not-allowed; opacity: 0.38; }

.app-shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; padding: 1.25rem 0 1rem; }
.topbar, .control-panel, footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.topbar { border-bottom: 2px solid var(--ink); padding-bottom: 1rem; }
.eyebrow { margin: 0 0 0.25rem; color: var(--muted); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.14em; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(1.7rem, 4vw, 2.7rem); letter-spacing: -0.04em; }
h2 { margin-bottom: 0.4rem; font-size: 1.05rem; }
.status-cluster { display: flex; flex-direction: column; align-items: flex-end; gap: 0.3rem; color: var(--muted); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em; text-align: right; }

.game-frame { position: relative; overflow: hidden; margin: 1rem 0; border: 2px solid var(--ink); background: #d7e4e9; }
canvas { display: block; width: 100%; height: min(66vh, 690px); min-height: 420px; cursor: crosshair; }
.canvas-hud { position: absolute; top: 0.85rem; display: flex; flex-wrap: wrap; gap: 0.8rem; font-size: 0.72rem; font-weight: 800; letter-spacing: 0.07em; pointer-events: none; }
.hud-top-left { left: 0.9rem; }
.hud-top-right { right: 0.9rem; justify-content: flex-end; text-align: right; }
.canvas-hud span { border: 1px solid var(--ink); background: rgba(244, 241, 232, 0.88); padding: 0.35rem 0.5rem; }
.canvas-hud strong { color: var(--blue); }

.start-card { position: absolute; inset: 50% auto auto 50%; width: min(390px, calc(100% - 2rem)); transform: translate(-50%, -50%); border: 2px solid var(--ink); background: var(--paper); padding: 1.3rem; text-align: center; }
.start-card h2 { font-size: 1.7rem; }
.start-card p:not(.eyebrow) { color: var(--muted); line-height: 1.45; }

.control-panel { align-items: flex-start; border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); padding: 1rem 0; }
.control-copy { min-width: 190px; }
.control-copy p { max-width: 360px; margin-bottom: 0; color: var(--muted); line-height: 1.4; }
.control-list { display: grid; gap: 0.45rem; color: var(--muted); font-size: 0.85rem; line-height: 1.4; }
kbd { display: inline-block; border: 1px solid var(--ink); background: var(--paper); color: var(--ink); padding: 0.12rem 0.32rem; font-size: 0.72rem; font-weight: 800; }
.button-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-left: auto; }
footer { padding-top: 0.75rem; color: var(--muted); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }

@media (max-width: 800px) {
  .topbar, .control-panel, footer { align-items: flex-start; flex-direction: column; }
  .status-cluster { align-items: flex-start; text-align: left; }
  .button-row { margin-left: 0; }
  canvas { min-height: 380px; height: 58vh; }
}