/* ===== Tower Defense 3D — fixed "forest board" theme, fullscreen =====
   No center chrome (no c-bar / c-app / gc-back). The canvas fills the
   viewport and every control floats above it as a chunky game HUD. */
:root {
  --td-bg: #2f5a34;
  --td-panel: rgba(26, 20, 12, .82);
  --td-panel-2: rgba(40, 30, 18, .74);
  --td-line: rgba(255, 220, 150, .3);
  --td-text: #fff6e6;
  --td-muted: #d9c7a6;
  --td-gold: #ffcf5c;
  --td-green: #3fa268;
  --td-green-hi: #74d98d;
  --td-leaf: #2f9e57;
  --td-danger: #ff6b6b;
  --td-sky: #6fd8c0;
  --td-on-green: #06301a;
  --td-wood: #7a5230;
}

html, body { height: 100%; }
body.td-body {
  margin: 0;
  overflow: hidden;
  background: var(--td-bg);
  color: var(--td-text);
  font-family: "Trebuchet MS", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#scene { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

/* ---------- Floating game HUD ---------- */
.td-hud { position: fixed; inset: 0; pointer-events: none; z-index: 10; font-weight: 700; }
.td-hud[hidden] { display: none; }

.td-topbar {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 10px; padding: 12px 14px; pointer-events: none;
}
.td-stats { display: flex; flex-wrap: wrap; gap: 8px; }
.td-actions { display: flex; gap: 8px; }

/* stat chips */
.td-chip {
  pointer-events: auto;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 14px 6px 10px; border-radius: 999px;
  background: var(--td-panel); border: 2px solid var(--td-line);
  box-shadow: 0 3px 0 rgba(0, 0, 0, .3), inset 0 1px 0 rgba(255, 255, 255, .12);
  font-size: 16px; font-weight: 800; color: var(--td-text); line-height: 1;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .5);
}
.td-chip i { font-size: 17px; font-style: normal; }
.td-chip b { font-variant-numeric: tabular-nums; min-width: 1ch; }
.td-chip--gold  { border-color: var(--td-gold);    color: #ffe9ad; }
.td-chip--life  { border-color: var(--td-danger);  color: #ffd0d0; }
.td-chip--wave  { border-color: var(--td-green-hi);}
.td-chip--score { border-color: var(--td-sky); }

/* pause / menu buttons — icon stays even when JS swaps the label */
.td-btn {
  pointer-events: auto; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border: 0; border-bottom: 4px solid rgba(0, 0, 0, .4);
  border-radius: 14px; color: var(--td-text);
  background: linear-gradient(180deg, #5b6678, #3a4351);
  font: inherit; font-size: 15px; font-weight: 800; letter-spacing: .03em; text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .35);
  transition: transform .08s ease, filter .12s ease;
}
.td-btn:hover { filter: brightness(1.08); }
.td-btn:active { transform: translateY(3px); border-bottom-width: 1px; }
.td-btn--pause::before { content: "\23F8"; font-size: 15px; }
.td-btn--menu::before { content: "\2630"; }
.td-btn[aria-pressed="true"] { background: linear-gradient(180deg, #ff9f5b, #d97a2b); }

/* hint ribbon */
.td-hint {
  pointer-events: auto; margin: 0;
  position: absolute; left: 50%; top: 60px; transform: translateX(-50%);
  max-width: min(72vw, 460px); text-align: center;
  padding: 7px 18px; border-radius: 999px;
  background: var(--td-panel); border: 2px solid var(--td-line);
  box-shadow: 0 3px 0 rgba(0, 0, 0, .3);
  font-size: 13px; font-weight: 700; color: var(--td-muted); text-shadow: 0 1px 1px rgba(0,0,0,.4);
}

/* ---------- Build dock ---------- */
.td-dock {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; align-items: flex-end; justify-content: center; flex-wrap: wrap;
  gap: 12px; padding: 14px; pointer-events: none;
}
.td-build {
  pointer-events: auto; display: flex; gap: 10px;
  padding: 10px 12px; border-radius: 18px;
  background: linear-gradient(180deg, var(--td-panel-2), var(--td-panel));
  border: 2px solid var(--td-line);
  box-shadow: 0 5px 0 rgba(0, 0, 0, .3), 0 12px 24px rgba(0, 0, 0, .4);
}
.td-tool {
  pointer-events: auto; cursor: pointer; position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  width: 92px; padding: 12px 8px 10px; border: 0; border-radius: 14px;
  background: linear-gradient(180deg, #40485a, #2b3242);
  border-bottom: 4px solid rgba(0, 0, 0, .4);
  color: var(--td-text); font: inherit;
  transition: transform .1s ease, box-shadow .12s ease, filter .12s ease;
  overflow: hidden;
}
.td-tool::before { /* coloured banner per tower type */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 5px;
}
.td-tool--gun::before    { background: var(--td-sky); }
.td-tool--rapid::before  { background: var(--td-green-hi); }
.td-tool--cannon::before { background: #ff9f5b; }
.td-tool__icon { font-size: 30px; line-height: 1; margin-bottom: 2px; filter: drop-shadow(0 2px 2px rgba(0,0,0,.5)); }
.td-tool__name { font-size: 14px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.td-tool__cost {
  display: inline-flex; align-items: center; gap: 3px; margin-top: 4px;
  padding: 2px 9px; border-radius: 999px; font-size: 12px; font-weight: 800;
  background: rgba(0, 0, 0, .4); color: var(--td-gold);
}
.td-tool__cost::before { content: "\1FA99"; font-size: 11px; }
.td-tool:hover { filter: brightness(1.1); }
.td-tool.is-on {
  transform: translateY(-10px);
  box-shadow: 0 0 0 3px var(--td-gold), 0 10px 18px rgba(0, 0, 0, .5);
  background: linear-gradient(180deg, #5a6a48, #3a4a2c);
}
.td-tool.is-poor { opacity: .5; filter: saturate(.35) grayscale(.3); }

/* Start Wave CTA */
.td-cta {
  pointer-events: auto; cursor: pointer; border: 0;
  padding: 14px 26px; border-radius: 16px;
  color: var(--td-on-green); background: linear-gradient(180deg, var(--td-green-hi), var(--td-green));
  border-bottom: 5px solid #2c7a4b;
  font: inherit; font-size: 17px; font-weight: 900; letter-spacing: .05em; text-transform: uppercase;
  box-shadow: 0 6px 0 #2c7a4b, 0 12px 22px rgba(0, 0, 0, .45);
  text-shadow: 0 1px 0 rgba(255, 255, 255, .25);
  transition: transform .08s ease, filter .12s ease;
}
.td-cta:hover { filter: brightness(1.06); }
.td-cta:active { transform: translateY(4px); border-bottom-width: 1px; box-shadow: 0 2px 0 #2c7a4b, 0 6px 14px rgba(0,0,0,.4); }
.td-cta--wave { font-size: 18px; padding: 15px 30px; }
#btnStart:disabled {
  cursor: default; filter: saturate(.5) brightness(.85);
  background: linear-gradient(180deg, #6a7382, #4a525f); color: #dfe6ef; border-bottom-color: #333a44;
  box-shadow: 0 5px 0 #333a44, 0 8px 16px rgba(0, 0, 0, .35);
}

/* ---------- Full-screen overlays (menu / game-over) ---------- */
.td-screen {
  position: fixed; inset: 0; z-index: 20;
  display: flex; align-items: center; justify-content: center;
  padding: 20px; overflow-y: auto; overscroll-behavior: contain;
  background: radial-gradient(130% 100% at 50% 0%, rgba(30, 60, 40, .5), rgba(6, 14, 8, .9));
  backdrop-filter: blur(3px);
}
.td-screen[hidden] { display: none; }

.td-card {
  width: min(520px, 96vw); margin: auto;
  padding: 26px 26px 30px; border-radius: 24px; text-align: center;
  color: var(--td-text);
  background: linear-gradient(180deg, rgba(34, 42, 30, .96), rgba(18, 22, 16, .97));
  border: 3px solid var(--td-line);
  box-shadow: 0 18px 0 rgba(0, 0, 0, .25), 0 30px 70px rgba(0, 0, 0, .6);
}
.td-card__crest {
  font-size: 46px; line-height: 1; margin: -6px auto 6px;
  filter: drop-shadow(0 3px 4px rgba(0, 0, 0, .5));
}
.td-card__crest--over { filter: drop-shadow(0 3px 6px rgba(180, 40, 40, .6)); }
.td-card__title {
  margin: 0 0 6px; font-size: clamp(30px, 7vw, 46px); font-weight: 900;
  letter-spacing: .01em; text-transform: uppercase;
  color: var(--td-gold); text-shadow: 0 3px 0 #7a5a10, 0 5px 10px rgba(0, 0, 0, .5);
}
.td-card__over { margin: 0 0 6px; font-size: clamp(26px, 6vw, 40px); font-weight: 900; text-transform: uppercase; color: var(--td-danger); text-shadow: 0 3px 0 #6a1414, 0 5px 10px rgba(0,0,0,.5); }
.td-card__lead { margin: 8px auto 16px; max-width: 420px; color: var(--td-muted); font-size: 15px; line-height: 1.5; }
.td-card__stats { margin: 0 0 4px; color: var(--td-muted); font-size: 15px; font-weight: 700; }

/* tower legend row */
.td-legend { list-style: none; margin: 0 auto 16px; padding: 0; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.td-legend__item {
  display: flex; align-items: center; gap: 6px; position: relative;
  padding: 8px 14px 8px 12px; border-radius: 14px; font-size: 13px; color: var(--td-muted);
  background: rgba(0, 0, 0, .35); border: 2px solid transparent; border-left-width: 5px;
}
.td-legend__item span { font-size: 20px; }
.td-legend__item b { color: var(--td-text); }
.td-legend__item.td-tool--gun    { border-left-color: var(--td-sky); }
.td-legend__item.td-tool--rapid  { border-left-color: var(--td-green-hi); }
.td-legend__item.td-tool--cannon { border-left-color: #ff9f5b; }

.td-card__list { margin: 0 auto 20px; padding: 0; list-style: none; display: grid; gap: 8px; text-align: left; max-width: 420px; font-size: 13.5px; color: var(--td-muted); }
.td-card__list b { color: var(--td-green-hi); }
.td-card__row { display: flex; gap: 12px; justify-content: center; margin-top: 20px; flex-wrap: wrap; align-items: stretch; }
.td-card__row > * { flex: 1 1 0; min-width: 150px; display: inline-flex; align-items: center; justify-content: center; }
.td-cta--play { width: min(280px, 90%); margin: 0 auto; }
.td-link { display: block; width: min(280px, 90%); margin: 14px auto 0; text-align: center; color: var(--td-muted); font-size: 13px; font-weight: 700; text-decoration: none; border-bottom: 1px dashed var(--td-line); }
.td-link:hover { color: var(--td-text); }
kbd {
  display: inline-block; min-width: 20px; padding: 1px 6px; margin: 0 1px;
  border-radius: 6px; border: 1px solid var(--td-line);
  background: rgba(255, 255, 255, .08); font: 800 12px/1.4 inherit; color: var(--td-text);
}

@media (max-width: 560px) {
  .td-chip { font-size: 14px; padding: 5px 10px 5px 8px; }
  .td-chip i { font-size: 15px; }
  .td-btn { padding: 9px 12px; font-size: 13px; }
  .td-tool { width: 76px; padding: 10px 6px 8px; }
  .td-tool__icon { font-size: 26px; }
  .td-hint { top: 52px; font-size: 12px; }
  .td-cta { font-size: 15px; padding: 12px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .td-tool, .td-btn, .td-cta { transition: none; }
}