:root {
  --ink: #05070c;
  --glow: #7cf0ff;
  --warn: #ff5a6a;
  --paper: #e8f4ff;
  --hot: #ffb040;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  background: var(--ink);
  color: var(--paper);
  font-family: "Segoe UI", Tahoma, sans-serif;
  overflow: hidden;
  user-select: none;
}
.hidden { display: none !important; }
#logo-screen, #click-start {
  position: fixed;
  inset: 0;
  z-index: 20000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #05070c;
}
#logo-screen img { max-width: min(72vw, 420px); height: auto; }
#logo-screen.fade { opacity: 0; transition: opacity 0.55s ease; pointer-events: none; }
#click-start { cursor: pointer; }
#click-start h1 {
  font-family: "Black Ops One", Impact, sans-serif;
  font-size: clamp(28px, 7vw, 72px);
  color: var(--glow);
  letter-spacing: 0.12em;
  animation: clickPulse 1.4s ease-in-out infinite;
}
@keyframes clickPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.04); }
}
#view {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  outline: none;
}
#hud {
  position: fixed;
  top: 14px;
  left: 16px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
#nrgWrap {
  position: fixed;
  top: 4px; left: 0; right: 0;
  height: 4px;
  background: #1a1810;
  z-index: 3;
}
#nrgBar { height: 100%; width: 100%; background: #ffe080; box-shadow: 0 0 10px #ffe080; transform-origin: left center; }
#hullBox, #modBox, #help, #nrgBox {
  background: rgba(8, 12, 20, 0.72);
  border: 1px solid rgba(124, 240, 255, 0.35);
  padding: 8px 12px;
  letter-spacing: 0.08em;
  width: fit-content;
}
#hullBox { font-size: 18px; }
#hullBox .lbl, #hullMax { color: #7aa0b8; font-size: 12px; }
#hullVal { color: var(--glow); font-weight: 700; margin: 0 4px; }
#modBox {
  display: flex;
  gap: 10px;
  font-size: 11px;
  color: #9ec8e0;
}
#nrgBox { font-size: 14px; }
#nrgBox .lbl, #nrgMax { color: #b8a060; font-size: 12px; }
#nrgVal { color: #ffe080; font-weight: 700; margin: 0 4px; }
#help { font-size: 11px; color: #7aa0b8; max-width: 420px; line-height: 1.4; }
#scoreBox {
  position: fixed;
  top: 14px;
  right: 16px;
  z-index: 3;
  text-align: right;
  background: rgba(8, 12, 20, 0.72);
  border: 1px solid rgba(124, 240, 255, 0.35);
  padding: 10px 14px;
  pointer-events: none;
  letter-spacing: 0.12em;
}
#scoreBox .lbl { font-size: 11px; color: #7aa0b8; }
#scoreVal { font-size: 28px; color: var(--glow); font-weight: 700; line-height: 1.1; }
#scoreBox .best { font-size: 11px; color: #9ec8e0; margin-top: 4px; }
#muteBtn {
  position: fixed;
  top: 14px;
  right: 168px;
  z-index: 6;
  margin: 0;
  padding: 8px 12px;
  background: rgba(8, 12, 20, 0.85);
  color: var(--glow);
  border: 1px solid rgba(124, 240, 255, 0.45);
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  pointer-events: auto;
}
#muteBtn.off {
  color: #7aa0b8;
  border-color: rgba(122, 160, 184, 0.45);
}
#muteBtn:hover { border-color: var(--glow); }
@media (max-width: 720px) {
  #muteBtn { right: 16px; top: auto; bottom: 16px; }
}
#barWrap {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: #12202c;
  z-index: 3;
}
#bar { height: 100%; width: 100%; background: var(--glow); box-shadow: 0 0 12px var(--glow); transform-origin: left center; }
#bar.cool { background: var(--hot); box-shadow: 0 0 12px var(--hot); }
#overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(4, 6, 12, 0.72);
  z-index: 5;
}
#overlay.show { display: flex; }
.panel {
  max-width: 560px;
  padding: 28px 32px;
  background: #0c141e;
  border: 1px solid var(--glow);
  box-shadow: 0 0 40px rgba(124, 240, 255, 0.15);
}
.panel.hidden { display: none; }
h1 { letter-spacing: 0.22em; font-size: 28px; color: var(--glow); margin-bottom: 12px; }
p { line-height: 1.55; color: #c5d8e8; margin-bottom: 10px; }
.hint { font-size: 13px; color: #7aa0b8; }
button {
  margin-top: 10px;
  margin-right: 8px;
  background: var(--glow);
  color: #051018;
  border: 0;
  padding: 10px 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  cursor: pointer;
}
button.ghost {
  background: transparent;
  color: var(--glow);
  border: 1px solid var(--glow);
}
#panel-size { max-width: 720px; }
.size-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.size-pick {
  flex: 1;
  min-width: 160px;
  margin: 0;
  padding: 14px 12px;
  background: #0a121c;
  color: var(--paper);
  border: 1px solid rgba(124, 240, 255, 0.45);
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  letter-spacing: 0.06em;
}
.size-pick b { color: var(--glow); font-size: 14px; letter-spacing: 0.14em; }
.size-pick span { font-size: 12px; color: #9ec8e0; font-weight: 400; line-height: 1.35; }
.size-pick:hover { border-color: var(--glow); background: #102030; }
#panel-over { max-width: 640px; }
#panel-over h1 { color: var(--warn); }
.shop { margin: 16px 0 8px; }
.shop-bank {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: #ffe080;
  margin-bottom: 10px;
}
.upg-row { display: flex; gap: 8px; flex-wrap: wrap; }
.upg {
  flex: 1;
  min-width: 88px;
  margin: 0;
  padding: 10px 8px;
  background: #0a121c;
  color: var(--paper);
  border: 1px solid rgba(124, 240, 255, 0.45);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  letter-spacing: 0.08em;
}
.upg:hover:not(:disabled) { border-color: var(--glow); background: #102030; }
.upg:disabled { opacity: 0.38; cursor: default; }
.upg-name { font-size: 11px; color: var(--glow); }
.upg-lv { font-size: 10px; color: #7aa0b8; }
.upg-cost { font-size: 11px; color: #ffe080; }
.ico {
  width: 28px;
  height: 28px;
  display: block;
  position: relative;
}
.ico-dmg {
  background:
    linear-gradient(135deg, transparent 42%, var(--warn) 42%, var(--warn) 58%, transparent 58%),
    linear-gradient(45deg, transparent 42%, var(--warn) 42%, var(--warn) 58%, transparent 58%);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  background-color: #3a1520;
}
.ico-spd {
  background: transparent;
  border-left: 10px solid var(--glow);
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  width: 0;
  height: 0;
  margin: 6px 0 6px 8px;
  box-shadow: 10px 0 0 var(--glow);
}
.ico-nrg {
  background: linear-gradient(#ffe080, #ffe080) 11px 6px / 6px 16px no-repeat;
  border: 2px solid #ffe080;
  border-radius: 3px;
  width: 18px;
  height: 22px;
  margin: 3px auto 0;
}
.ico-nrg::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 5px;
  width: 8px;
  height: 3px;
  background: #ffe080;
}
.ico-hp {
  background: linear-gradient(#7cf0ff, #7cf0ff) 11px 6px / 6px 16px no-repeat,
    linear-gradient(#7cf0ff, #7cf0ff) 4px 11px / 20px 6px no-repeat;
  border: 2px solid var(--glow);
  border-radius: 50%;
  width: 26px;
  height: 26px;
}