:root { color-scheme: dark; }
* { box-sizing: border-box; }
body.viewport-game { --accent: #efd49a; --guide-panel: #173b45; margin: 0; height: 100dvh; min-height: 0; overflow: hidden; overscroll-behavior: none; }
html:has(body.viewport-game) { height: 100%; overflow: hidden; overscroll-behavior: none; }
body.viewport-game > .shell { height: 100%; max-width: 1440px; padding: 0 max(12px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(12px,env(safe-area-inset-left)); display: flex; flex-direction: column; }
body.viewport-game .site-header { min-height: 36px; padding: 3px 0; gap: 4px 12px; flex: none; }
body.viewport-game .site-brand { min-height: 28px; font-size: 10px; }
body.viewport-game .site-header-right { flex-basis: auto; gap: 8px; }
body.viewport-game .site-page-details { font-size: 10px; gap: 6px; }
body.viewport-game .site-header .site-nav { font-size: 10px; gap: 10px; }
body.viewport-game .site-header .site-nav a { min-height: 28px; }
main { min-height: 0; flex: 1; display: flex; flex-direction: column; }
.mast { flex: none; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 5px 0; }
body.viewport-game .mast h1 { font-size: 25px; line-height: 1.1; margin: 0; }
.mast p { margin: 0; font-size: 11px; color: var(--muted); }
.objective { flex: none; display: grid; gap: 2px; background: var(--panel); padding: 6px 12px; font-size: 12px; }
.objective>div { display: flex; justify-content: space-between; gap: 8px; }
.objective b { font: bold 16px/1.2 Consolas,monospace; color: var(--accent); }
.objective span { font-size: 11px; color: var(--accent); }
.objective p { margin: 0; font-size: 11px; }
.objective small { font-size: 10px; color: var(--muted); }
.stage-picker { display: flex; align-items: center; gap: 6px; font-size: 11px; }
.stage-picker select { max-width: 100%; padding: 5px 8px; }
.stage-note { flex: none; margin: 0; font-size: 10px; color: var(--muted); }
.hud { flex: none; display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 7px 12px; background: var(--deep); border: 1px solid var(--line); font: 12px/1.5 Consolas,monospace; }
.next,.core { display: inline-flex; align-items: center; gap: 10px; }
#next-enemies { display: inline-flex; align-items: center; gap: 8px; min-height: 24px; }
.enemy-symbol { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 24px; font-size: 22px; line-height: 1; }
.kind-a { color: #b9e4d0; }.kind-b { color: #e8c381; }.kind-c { color: #97bde8; }
#core-hp { color: var(--accent); letter-spacing: .18em; }
.arena { flex: 1; min-height: 0; display: flex; flex-direction: column; border: 1px solid var(--line); border-top: 0; background: var(--deep); }
.canvas-stage { position: relative; flex: 1; min-height: 0; min-width: 0; display: flex; align-items: center; justify-content: center; container-type: size; overflow: hidden; }
canvas { display: block; flex: none; width: min(100cqw,calc(100cqh * 16 / 9)); height: min(100cqh,calc(100cqw * 9 / 16)); aspect-ratio: 16/9; touch-action: none; outline: none; }
button,select { font: 12px/1.4 var(--sans,system-ui); border: 1px solid var(--line); background: var(--deep); color: var(--ink); border-radius: 3px; padding: 8px 14px; min-width: 48px; min-height: 48px; cursor: pointer; touch-action: manipulation; }
body.viewport-game button { min-height: 48px; }
button:hover { border-color: var(--accent); }button:disabled { opacity: .4; cursor: default; }
.primary { color: #142b2d; border-color: var(--accent); background: var(--accent); font-weight: 700; }
[hidden] { display: none !important; }
/* Keep the board size and position stable when a stage starts. */
.build-controls.inactive { visibility: hidden; }
.build-controls { flex: none; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px 16px; padding: 5px 12px; border-top: 1px solid var(--line); }
.build-controls p { margin: 0; font-size: 12px; color: var(--muted); }.build-controls button { padding: 6px 18px; }
.enemy-guide { flex: none; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 4px 16px; padding: 4px 12px; background: var(--panel); font-size: 11px; line-height: 1.4; }.enemy-guide b { margin-right: 5px; font-size: 16px; }
.caption { flex: none; display: flex; justify-content: space-between; gap: 12px; min-height: 26px; padding: 5px 0; color: var(--muted); font-size: 11px; line-height: 1.4; }.caption span { min-width: 0; }
.toolbar { display: flex; align-items: center; flex-wrap: wrap; flex: none; gap: 6px; padding: 5px 0; border-top: 1px solid var(--line); }.toolbar button { padding: 6px 12px; font-size: 11px; }
.touch-controls { flex: none; display: none; gap: 5px; padding: 3px 0; }.touch-controls button { flex: 1; min-width: 48px; padding: 3px 2px; min-height: 48px; font-size: 11px; }.touch-controls button span { display: block; font-size: 10px; color: var(--muted); }.touch-controls button.armed,.touch-controls button.holding { border-color: var(--accent); }
.mobile { display: none; flex: none; font-size: 10px; color: var(--muted); margin: 2px 0; }
.cover { position: absolute; inset: 0; z-index: 3; display: flex; align-items: center; justify-content: center; padding: 12px; background: #0b222ce8; overflow: auto; }
.menu-card { width: min(420px,100%); max-height: 100%; overflow: auto; margin: auto; padding: 20px; background: var(--panel); border: 1px solid var(--accent); border-radius: 6px; text-align: center; box-shadow: 0 8px 28px #0005; }
.eyebrow { font: 10px/1.6 Consolas,monospace; letter-spacing: .06em; color: var(--accent); margin: 0; }.menu-card h2 { font: 700 26px/1.3 var(--sans,system-ui); margin: 10px 0; color: var(--accent); }.menu-card p { font-size: 12px; line-height: 1.8; color: var(--muted); }
.menu-actions { display: flex; flex-direction: column; gap: 8px; }.result-stats { display: grid; grid-template-columns: 1fr; gap: 8px 12px; margin: 12px 0; font-size: 12px; }.result-stats div { background: var(--deep); padding: 6px; }.result-stats dt { color: var(--muted); }.result-stats dd { margin: 3px 0 0; font: 16px/1.4 Consolas,monospace; color: var(--accent); }
.tutorial { flex: none; display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; padding: 10px 12px; background: var(--guide-panel); border-bottom: 1px solid var(--accent); }.tutorial-heading { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; gap: 8px; }.tutorial-heading>span { font-size: 10px; color: var(--accent); }body.viewport-game .tutorial-heading button { min-height: 32px; padding: 4px 8px; font-size: 11px; color: var(--muted); }
.tutorial-progress { grid-column: 1 / -1; display: flex; gap: 4px; }.tutorial-progress span { flex: 1; padding: 3px; text-align: center; border-bottom: 2px solid var(--line); font-size: 10px; color: var(--muted); }.tutorial-progress .current { background: var(--accent); color: var(--deep); border-color: var(--accent); font-weight: 700; }.tutorial-progress .done { color: var(--accent); border-color: var(--accent); }
.tutorial h2 { margin: 0 0 3px; font: 700 15px/1.4 var(--sans,system-ui); }.tutorial p { margin: 2px 0; font-size: 11px; line-height: 1.5; color: var(--muted); }#tutorial-feedback { color: var(--accent); }.tutorial-actions { display: flex; flex-direction: column; justify-content: center; gap: 5px; font-size: 11px; max-width: 260px; }
.tutorial-focus { outline: 2px solid var(--accent); outline-offset: -2px; animation: guide-pulse 1.5s ease-in-out infinite; }@keyframes guide-pulse { 50% { box-shadow: inset 0 0 14px #efd49a55; } }
body.viewport-game>.shell>.footer-ad { flex: none; display: flex; align-items: flex-start; justify-content: center; min-height: 50px; max-height: clamp(50px,16dvh,100px); min-width: 0; margin: 0; overflow: hidden; text-align: center; }.footer-ad-content { flex: none; width: max-content; transform-origin: top center; }
 dialog { color: var(--ink); background: var(--panel); border: 1px solid var(--accent); border-radius: 6px; padding: 24px; width: min(560px,calc(100vw - 28px)); max-height: calc(100dvh - clamp(50px,16dvh,100px) - 24px); overflow: auto; position: fixed; inset: 12px 0 calc(clamp(50px,16dvh,100px) + 12px); margin: auto; }
dialog::backdrop { background: linear-gradient(to bottom,#020b12cc calc(100% - clamp(50px,16dvh,100px)),transparent calc(100% - clamp(50px,16dvh,100px))); }dialog h2 { margin: 12px 0; font-size: 24px; line-height: 1.4; }dialog p,dialog li { font-size: 13px; line-height: 1.8; }dialog ul { padding-left: 22px; }dialog b { color: var(--accent); }.tutorial-choice-actions { display: flex; flex-wrap: wrap; gap: 10px; }.tutorial-choice-actions button { flex: 1 1 180px; }
#debug { position: fixed; z-index: 6; top: 40px; left: 12px; width: min(600px,calc(100vw - 24px)); max-height: 45dvh; overflow: auto; background: var(--deep); border: 1px solid var(--line); padding: 10px; font-size: 11px; }#debug pre { white-space: pre-wrap; overflow-wrap: anywhere; }
@media(any-pointer:coarse),(max-width:700px) { .touch-controls { display: flex; }.mobile { display: block; } }
@media(max-width:700px) {
body.viewport-game .site-header-right { flex-basis: 100%; gap: 2px 8px; }body.viewport-game .mast h1 { font-size: 19px; }.mast p,.objective span,.caption>span:last-child { display: none; }.objective { font-size: 11px; padding: 4px 8px; }
.hud { font-size: 10px; padding: 4px 8px; gap: 5px; }.next,.core { gap: 5px; }#next-enemies { gap: 3px; }.enemy-symbol { width: 16px; font-size: 19px; }#core-hp { letter-spacing: .04em; }
.enemy-guide { font-size: 10px; padding: 3px 6px; gap: 3px 10px; }.enemy-guide span:last-child { display: none; }.toolbar { gap: 4px; }.toolbar button { flex: 1; padding: 5px 4px; font-size: 10px; }.caption { font-size: 10px; padding: 3px 0; min-height: 22px; }
.build-controls { padding: 4px 8px; gap: 4px; }.build-controls p { font-size: 10px; }.build-controls button { font-size: 11px; }
.tutorial { padding: 6px 8px; gap: 4px 8px; grid-template-columns: 1fr; }.tutorial-actions { flex-direction: row; align-items: center; justify-content: space-between; max-width: none; }.tutorial h2 { font-size: 13px; }.tutorial p { font-size: 10px; }.tutorial-progress span { font-size: 9px; }.tutorial-actions button { font-size: 11px; padding: 5px 10px; }
dialog { padding: 18px; }dialog h2 { font-size: 19px; }dialog p,dialog li { font-size: 12px; }.menu-card { padding: 12px; }.menu-card h2 { font-size: 20px; }.menu-card p { font-size: 11px; }
}
@media(max-height:500px) {
.mast { padding: 2px 0; }body.viewport-game .mast h1 { font-size: 18px; }.objective,.enemy-guide,.mobile { display: none; }.hud { padding: 3px 8px; }.caption { padding: 2px 0; min-height: 20px; font-size: 10px; }.caption>span:last-child { display: none; }.toolbar { padding: 3px 0; }.touch-controls { padding: 2px 0; }
.arena:has(.tutorial:not([hidden])) { flex-direction: row; }.tutorial { flex: 0 0 250px; display: flex; flex-direction: column; gap: 5px; overflow: auto; border-bottom: 0; border-right: 1px solid var(--accent); }.tutorial-actions { margin-top: auto; flex-direction: column; align-items: stretch; }.tutorial h2 { font-size: 13px; }.tutorial p { font-size: 10px; }
.menu-card { padding: 10px 14px; }.menu-card h2 { font-size: 20px; margin: 4px 0; }.menu-card p { margin: 4px 0; }.result-stats { gap: 4px 8px; margin: 6px 0; }.result-stats div { padding: 3px; }.menu-actions { gap: 5px; }
}
@media(prefers-reduced-motion:reduce) { .tutorial-focus { animation: none; } }
@media(max-width:700px) {
  .objective span { display: inline; font-size: 10px; }
  .objective p { font-size: 10px; }
  .stage-picker { flex: 1 1 100%; }
  .stage-picker select { flex: 1; min-width: 0; }
}
@media(max-height:500px) {
  .objective { display: grid; padding: 2px 8px; font-size: 10px; }
  .objective p,.objective small,.stage-note { display: none; }
  .objective b { font-size: 12px; }
}
/* Place the practice card beside the board so the tower and lane stay visible. */
@media(min-width:701px) and (min-height:501px) {
  .arena:has(.tutorial:not([hidden])) { flex-direction: row; }
  .tutorial { flex: 0 0 320px; display: flex; flex-direction: column; gap: 10px; padding: 12px; border-bottom: 0; border-right: 1px solid var(--accent); overflow: auto; }
  .tutorial-progress { margin: 2px 0; }
  .tutorial-description { flex: 1; }
  .tutorial h2 { font-size: 16px; margin-bottom: 8px; }
  .tutorial p { line-height: 1.7; font-size: 12px; }
  .tutorial-actions { max-width: none; }
}
@media(max-height:500px) and (min-width:701px) {
  main { display: grid; grid-template-columns: minmax(0,1fr) 180px; grid-template-rows: 34px minmax(0,1fr) 54px; gap: 4px 8px; }
  .mast,.caption,.objective { display: none; }
  .hud { grid-column: 1 / -1; grid-row: 1; }
  .arena { grid-column: 1; grid-row: 2; }
  .toolbar { grid-column: 2; grid-row: 2; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); align-content: center; border-top: 0; padding: 0; gap: 5px; }
  .toolbar button { padding: 5px; }
  .stage-picker { grid-column: 1 / -1; flex-direction: column; align-items: stretch; gap: 0; font-size: 10px; }
  .stage-picker select { font-size: 10px; padding: 3px; }
  .touch-controls { grid-column: 1 / -1; grid-row: 3; display: flex; }
  .tutorial { flex-basis: 220px; }
  .build-controls { padding: 3px 6px; gap: 4px; }
  .build-controls p { font-size: 10px; }
}