:root {
  --bg-0: #020705;
  --bg-1: #08130d;
  --green: #3dff8f;
  --cyan: #4dd8ff;
  --amber: #ff9d2e;
  --yellow: #ffd23d;
  --red: #ff4d6d;
  --text: #e2f5e9;
  --dim: #7fa88f;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  background: radial-gradient(1200px 700px at 50% -10%, #0c2417 0%, var(--bg-1) 45%, var(--bg-0) 100%);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  -webkit-user-select: none;
  user-select: none;
  touch-action: none;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
}

#stage {
  position: relative;
  width: min(100vw - 20px, calc((100vh - 70px) * 3 / 2), 1080px);
  aspect-ratio: 3 / 2;
  border-radius: 14px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(61, 255, 143, 0.25),
    0 0 40px rgba(61, 255, 143, 0.14),
    0 24px 80px rgba(0, 0, 0, 0.6);
  background: #07110c;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- HUD ---------- */
#hud {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  pointer-events: none;
  z-index: 5;
}

.hud-col { display: flex; flex-direction: column; gap: 6px; }
.hud-col.hud-right { align-items: flex-end; }
.hud-mid { display: flex; flex-direction: column; align-items: center; gap: 6px; }

.hud-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 72px;
  padding: 3px 10px;
  border-radius: 8px;
  background: rgba(4, 12, 8, 0.6);
  border: 1px solid rgba(61, 255, 143, 0.22);
}

.hud-label {
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--dim);
}

.hud-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--green);
  text-shadow: 0 0 10px rgba(61, 255, 143, 0.7);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.hud-wave-val { font-size: 15px; }
.hud-gold-val { color: var(--yellow); text-shadow: 0 0 10px rgba(255, 210, 61, 0.6); }

.hud-phase {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--dim);
  background: rgba(4, 12, 8, 0.6);
  border: 1px solid rgba(61, 255, 143, 0.18);
  padding: 2px 10px;
  border-radius: 20px;
}

.hud-core-box { min-width: 110px; }
.core-wrap {
  width: 104px;
  height: 10px;
  margin-top: 3px;
  border-radius: 5px;
  background: rgba(4, 12, 8, 0.8);
  border: 1px solid rgba(61, 255, 143, 0.25);
  overflow: hidden;
}

.core-fill {
  height: 100%;
  width: 100%;
  border-radius: 4px;
  transition: width 0.25s ease;
}
.core-fill.ok   { background: linear-gradient(90deg, #1f9d58, var(--green)); box-shadow: 0 0 8px rgba(61, 255, 143, 0.8); }
.core-fill.warn { background: linear-gradient(90deg, #b8860b, var(--yellow)); box-shadow: 0 0 8px rgba(255, 210, 61, 0.8); }
.core-fill.bad  { background: linear-gradient(90deg, #8f1f33, var(--red)); box-shadow: 0 0 8px rgba(255, 77, 109, 0.8); }

/* ---------- build bar ---------- */
#buildbar {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 10px;
  display: flex;
  align-items: stretch;
  gap: 8px;
  z-index: 6;
  pointer-events: none;
}

.tower-btn, .btn { pointer-events: auto; }

.tower-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  min-width: 74px;
  padding: 6px 8px 5px;
  border-radius: 10px;
  background: rgba(4, 12, 8, 0.78);
  border: 1px solid rgba(61, 255, 143, 0.3);
  color: var(--text);
  cursor: pointer;
  transition: all 0.12s ease;
}

.tower-btn:hover { border-color: var(--green); box-shadow: 0 0 14px rgba(61, 255, 143, 0.25); }

.tower-btn.active {
  border-color: var(--green);
  background: rgba(20, 46, 31, 0.9);
  box-shadow: 0 0 16px rgba(61, 255, 143, 0.4);
}

.tower-btn.off { opacity: 0.42; }

.tb-icon { font-size: 17px; line-height: 1.1; }
.tb-name { font-size: 9px; font-weight: 700; letter-spacing: 1.5px; }
.tb-cost { font-size: 10px; color: var(--yellow); font-variant-numeric: tabular-nums; }
.tb-key {
  position: absolute;
  top: 3px;
  right: 5px;
  font-size: 8px;
  color: var(--dim);
  border: 1px solid rgba(127, 168, 143, 0.4);
  border-radius: 3px;
  padding: 0 3px;
}

kbd {
  font-family: inherit;
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--dim);
  border: 1px solid rgba(127, 168, 143, 0.4);
  border-radius: 4px;
  padding: 1px 6px;
}

/* call-wave button */
.btn-wave {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  animation: wave-pulse 1.6s ease-in-out infinite;
}

@keyframes wave-pulse {
  0%, 100% { box-shadow: 0 0 8px rgba(61, 255, 143, 0.25); }
  50%      { box-shadow: 0 0 22px rgba(61, 255, 143, 0.55); }
}

/* selected-tower panel */
#tower-panel {
  min-width: 196px;
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(4, 12, 8, 0.85);
  border: 1px solid var(--green);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.tp-head { display: flex; justify-content: space-between; align-items: baseline; }
.tp-name { font-size: 12px; font-weight: 800; letter-spacing: 1.5px; color: var(--green); }
.tp-lvl  { font-size: 10px; color: var(--yellow); }
.tp-stats { font-size: 10px; color: var(--dim); letter-spacing: 0.5px; }
.tp-btns { display: flex; gap: 6px; }
.tp-btns .btn { flex: 1; padding: 4px 6px; font-size: 10px; }

/* ---------- buttons ---------- */
.btn {
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text);
  background: rgba(12, 26, 18, 0.85);
  border: 1px solid rgba(61, 255, 143, 0.4);
  border-radius: 10px;
  padding: 10px 26px;
  cursor: pointer;
  transition: all 0.12s ease;
}

.btn:hover { border-color: var(--green); box-shadow: 0 0 16px rgba(61, 255, 143, 0.3); transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(180deg, #123d24, #0c2a19);
  border-color: var(--green);
  color: #d9ffe9;
  text-shadow: 0 0 8px rgba(61, 255, 143, 0.8);
}

.btn-small {
  font-size: 11px;
  padding: 5px 10px;
  letter-spacing: 1px;
}

.btn:disabled { opacity: 0.4; cursor: default; transform: none; box-shadow: none; }

/* ---------- top bar ---------- */
#topbar {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  z-index: 8;
}

/* keep topbar clear of the HUD right column */
#hud .hud-col.hud-right { margin-right: 124px; }

.icon-btn {
  font-size: 13px;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  text-decoration: none;
  background: rgba(4, 12, 8, 0.7);
  border: 1px solid rgba(61, 255, 143, 0.3);
  color: var(--text);
  cursor: pointer;
  transition: all 0.12s ease;
}
.icon-btn:hover { border-color: var(--green); }

.back-link {
  color: var(--dim);
  font-size: 12px;
  letter-spacing: 1px;
  text-decoration: none;
  cursor: pointer;
}

.back-link:hover { color: var(--text); }

/* ---------- overlays / screens ---------- */
#overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: rgba(2, 7, 5, 0.72);
  backdrop-filter: blur(3px);
}

#overlay.hidden { display: none; }

.screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
  max-width: 560px;
  width: 100%;
}

.logo {
  font-size: 52px;
  font-weight: 900;
  letter-spacing: 10px;
  color: #d9ffe9;
  text-shadow: 0 0 24px rgba(61, 255, 143, 0.65);
}
.logo span {
  background: linear-gradient(90deg, var(--green), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline { color: var(--dim); letter-spacing: 1.5px; font-size: 14px; }

.big {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: 6px;
  text-shadow: 0 0 20px rgba(61, 255, 143, 0.5);
}
.over-title { color: var(--red); text-shadow: 0 0 22px rgba(255, 77, 109, 0.6); }
.win-title  { color: var(--green); }

.final-score { font-size: 16px; color: var(--dim); }
.final-score span { color: var(--yellow); font-weight: 800; font-size: 20px; }

.win-bonus-line { font-size: 12px; color: var(--dim); }
.win-bonus-line span { color: var(--green); font-weight: 700; }

.new-record {
  color: var(--yellow);
  font-weight: 800;
  letter-spacing: 2px;
  animation: rec-blink 0.9s ease-in-out infinite;
}

@keyframes rec-blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.35; }
}

.entry-label { font-size: 12px; color: var(--dim); letter-spacing: 1px; }

form { display: flex; gap: 8px; }

input {
  width: 84px;
  font-family: inherit;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 8px;
  text-align: center;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(4, 12, 8, 0.8);
  border: 1px solid rgba(61, 255, 143, 0.4);
  border-radius: 8px;
  padding: 8px 4px;
  outline: none;
}
input:focus { border-color: var(--green); box-shadow: 0 0 12px rgba(61, 255, 143, 0.3); }

.hint { font-size: 11px; color: var(--dim); letter-spacing: 1px; line-height: 1.7; max-width: 460px; }

.btn-row { display: flex; gap: 10px; }

/* highscores */
.hs-wrap { width: 100%; max-width: 340px; }
.hs-title {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--dim);
  margin-bottom: 6px;
}

.hs-list {
  list-style: none;
  max-height: 168px;
  overflow-y: auto;
  border: 1px solid rgba(61, 255, 143, 0.18);
  border-radius: 10px;
  background: rgba(4, 12, 8, 0.5);
}

.hs-list li {
  display: flex;
  gap: 10px;
  padding: 4px 12px;
  font-size: 13px;
  border-bottom: 1px solid rgba(61, 255, 143, 0.08);
  font-variant-numeric: tabular-nums;
}
.hs-list li:last-child { border-bottom: none; }

.hs-rank  { width: 20px; color: var(--dim); text-align: right; }
.hs-name  { flex: 1; letter-spacing: 3px; color: var(--green); font-weight: 700; text-align: left; }
.hs-score { color: var(--yellow); }
.hs-empty { justify-content: center; color: var(--dim); font-size: 12px; }

/* misc */
.hidden { display: none !important; }

#footer {
  color: #3f6b52;
  font-size: 11px;
  letter-spacing: 1px;
}

@media (max-width: 700px) {
  .tb-name { display: none; }
  .tower-btn { min-width: 52px; }
  .btn-wave { font-size: 11px; letter-spacing: 1px; }
  #tower-panel { min-width: 150px; }
  .logo { font-size: 40px; letter-spacing: 6px; }
}