:root {
  --bg-a: #050611;
  --bg-b: #081223;
  --cyan: #51f6ff;
  --violet: #a76dff;
  --pink: #ff4fd8;
  --green: #6dff9f;
  --warning: #ffd166;
  --danger: #ff5a7a;
  --glass: rgba(10, 18, 38, .58);
  --glass-strong: rgba(7, 13, 29, .84);
  --text: #eef7ff;
  --muted: #9eb2d0;
  --line: rgba(117, 246, 255, .22);
}

* { box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: radial-gradient(circle at 50% 20%, #11204b 0%, var(--bg-b) 38%, var(--bg-a) 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, input { font: inherit; }
button { cursor: pointer; }

#gameWrap {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.hud {
  position: fixed;
  z-index: 5;
  pointer-events: none;
}

.hud-top {
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
}

.brand, .stats, .side-panel, .hud-bottom {
  background: linear-gradient(135deg, rgba(13, 27, 57, .72), rgba(4, 8, 20, .42));
  border: 1px solid var(--line);
  box-shadow: 0 0 28px rgba(81, 246, 255, .08), inset 0 0 22px rgba(167, 109, 255, .07);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 18px;
}
.brand strong { display: block; letter-spacing: .08em; font-size: 14px; }
.brand small { display: block; color: var(--muted); font-size: 11px; margin-top: 2px; }
.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 9px;
  background:
    linear-gradient(135deg, var(--cyan), var(--violet) 50%, var(--pink));
  box-shadow: 0 0 22px rgba(81, 246, 255, .7);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(64px, 1fr));
  gap: 6px;
  padding: 8px;
  border-radius: 20px;
}
.stats div {
  min-width: 72px;
  padding: 8px 10px;
  border-radius: 14px;
  background: rgba(255,255,255,.045);
  text-align: center;
}
.stats small {
  display: block;
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.stats b {
  display: block;
  font-size: 17px;
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(81,246,255,.6);
}

.side-panel {
  top: 96px;
  right: 14px;
  width: 250px;
  max-height: calc(100vh - 178px);
  border-radius: 20px;
  padding: 14px;
  overflow: hidden;
}
.side-panel h2 {
  margin: 0 0 10px;
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.ranking-list {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}
.ranking-list li {
  margin: 0 0 7px;
  padding-left: 2px;
}
.ranking-list strong { color: var(--text); }
.ranking-list small { color: var(--cyan); }

.hud-bottom {
  left: 14px;
  right: 14px;
  bottom: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  padding: 10px 14px;
  border-radius: 20px;
}
.controls-help { color: var(--muted); font-size: 12px; text-align: right; }
.powerup-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.power-pill {
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 999px;
  background: rgba(255,255,255,.07);
  color: var(--text);
  font-size: 12px;
  box-shadow: 0 0 16px rgba(81,246,255,.12);
}
.power-pill b { color: var(--cyan); }

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 22px;
  background: radial-gradient(circle at 50% 40%, rgba(81,246,255,.09), rgba(0,0,0,.72));
  backdrop-filter: blur(8px);
}
.overlay.visible { display: flex; }
.level-overlay { pointer-events: none; background: transparent; backdrop-filter: none; }

.panel {
  width: min(560px, calc(100vw - 32px));
  border: 1px solid rgba(117,246,255,.28);
  background:
    linear-gradient(135deg, rgba(16, 28, 61, .88), rgba(7, 10, 24, .88)),
    radial-gradient(circle at 20% 10%, rgba(255,79,216,.18), transparent 34%);
  box-shadow: 0 24px 70px rgba(0,0,0,.45), 0 0 60px rgba(81,246,255,.12), inset 0 0 40px rgba(167,109,255,.06);
  border-radius: 30px;
  padding: 30px;
  text-align: center;
}
.compact-panel { width: min(460px, calc(100vw - 32px)); padding: 24px; }
.panel h1, .panel h2 { margin: 4px 0 10px; }
.panel p { color: var(--muted); line-height: 1.55; }
.title-glow {
  display: inline-block;
  padding: 7px 13px;
  border: 1px solid rgba(81,246,255,.28);
  border-radius: 999px;
  color: var(--cyan);
  letter-spacing: .16em;
  font-size: 12px;
  text-shadow: 0 0 20px rgba(81,246,255,.7);
  box-shadow: 0 0 20px rgba(81,246,255,.09);
}
.title-glow.small { color: var(--danger); border-color: rgba(255,90,122,.3); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 20px 0;
}
.feature-grid span {
  padding: 11px;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 16px;
  background: rgba(255,255,255,.045);
  color: var(--text);
  font-size: 13px;
}
.name-label {
  display: grid;
  gap: 8px;
  text-align: left;
  color: var(--muted);
  font-size: 13px;
  margin: 12px 0;
}
.name-label input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  color: var(--text);
  border: 1px solid rgba(81,246,255,.25);
  background: rgba(4, 8, 20, .78);
  outline: none;
}
.name-label input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(81,246,255,.09);
}
.primary-btn, .secondary-btn {
  width: 100%;
  margin-top: 10px;
  border: 0;
  border-radius: 18px;
  padding: 15px 18px;
  color: #04101d;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.primary-btn {
  background: linear-gradient(135deg, var(--cyan), var(--green));
  box-shadow: 0 18px 45px rgba(81,246,255,.18), 0 0 32px rgba(109,255,159,.14);
}
.secondary-btn {
  color: var(--text);
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.11);
}
.hint { font-size: 12px; margin-bottom: 0; }
.toast {
  position: fixed;
  top: 94px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 12;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid rgba(81,246,255,.3);
  background: rgba(4,8,20,.82);
  color: var(--text);
  box-shadow: 0 0 32px rgba(81,246,255,.14);
  backdrop-filter: blur(10px);
  font-size: 13px;
  transition: opacity .25s ease, transform .25s ease;
}
.toast.hidden { opacity: 0; transform: translateX(-50%) translateY(-8px); pointer-events: none; }

@media (max-width: 900px) {
  .side-panel { display: none; }
  .hud-top { align-items: stretch; }
  .brand { display: none; }
  .stats { width: 100%; grid-template-columns: repeat(4, 1fr); }
  .stats div { min-width: 0; padding: 7px 5px; }
  .stats b { font-size: 15px; }
  .hud-bottom { min-height: 48px; align-items: flex-start; }
  .controls-help { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .panel { padding: 22px; border-radius: 24px; }
}

/* ARKA TECH 3D v1.1 - capa 2.5D más premium */
#gameWrap::before,
#gameWrap::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}
#gameWrap::before {
  background:
    radial-gradient(circle at 50% 54%, rgba(81,246,255,.08), transparent 26%),
    radial-gradient(circle at 18% 18%, rgba(255,79,216,.10), transparent 24%),
    radial-gradient(circle at 82% 22%, rgba(109,255,159,.07), transparent 26%);
  mix-blend-mode: screen;
}
#gameWrap::after {
  background:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px),
    radial-gradient(circle at center, transparent 48%, rgba(0,0,0,.28) 100%);
  background-size: 100% 4px, 4px 100%, 100% 100%;
  opacity: .72;
}
#gameCanvas {
  filter: saturate(1.18) contrast(1.05) drop-shadow(0 0 18px rgba(81,246,255,.12));
}
.primary-btn:active, .secondary-btn:active {
  transform: translateY(1px) scale(.995);
}

/* ARKA TECH 3D v2.0 OVERDRIVE */
html, body {
  background:
    radial-gradient(circle at 50% 16%, rgba(81,246,255,.18), transparent 28%),
    radial-gradient(circle at 18% 74%, rgba(255,79,216,.16), transparent 24%),
    radial-gradient(circle at 84% 28%, rgba(109,255,159,.10), transparent 28%),
    linear-gradient(145deg, #02040c 0%, #071126 46%, #030511 100%);
}
#gameWrap {
  isolation: isolate;
}
#gameWrap::before {
  background:
    radial-gradient(circle at 50% 54%, rgba(81,246,255,.11), transparent 25%),
    radial-gradient(circle at 18% 18%, rgba(255,79,216,.12), transparent 25%),
    radial-gradient(circle at 82% 22%, rgba(109,255,159,.09), transparent 26%),
    linear-gradient(120deg, transparent 0%, rgba(255,255,255,.035) 49%, transparent 53%);
  mix-blend-mode: screen;
  animation: arkaAurora 6s ease-in-out infinite alternate;
}
#gameWrap::after {
  background:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.020) 1px, transparent 1px),
    radial-gradient(circle at center, transparent 42%, rgba(0,0,0,.34) 100%);
  background-size: 100% 4px, 4px 100%, 100% 100%;
  opacity: .78;
}
#gameCanvas {
  filter: saturate(1.32) contrast(1.09) brightness(1.04) drop-shadow(0 0 24px rgba(81,246,255,.16));
}
.brand, .stats, .side-panel, .hud-bottom {
  background:
    linear-gradient(135deg, rgba(12, 25, 60, .80), rgba(4, 8, 20, .52)),
    radial-gradient(circle at 20% 0%, rgba(81,246,255,.12), transparent 40%);
  border: 1px solid rgba(117, 246, 255, .31);
  box-shadow:
    0 0 34px rgba(81, 246, 255, .11),
    0 0 70px rgba(255, 79, 216, .055),
    inset 0 0 24px rgba(167, 109, 255, .09);
}
.brand-mark {
  animation: arkaPulse 1.25s ease-in-out infinite alternate;
}
.stats b {
  font-size: 18px;
  color: #ffffff;
  text-shadow: 0 0 10px rgba(81,246,255,.9), 0 0 26px rgba(255,79,216,.32);
}
.power-pill {
  border-color: rgba(81,246,255,.25);
  background: linear-gradient(135deg, rgba(81,246,255,.13), rgba(255,79,216,.08));
  box-shadow: 0 0 20px rgba(81,246,255,.14), inset 0 0 14px rgba(255,255,255,.04);
}
.power-pill.overdrive {
  color: #fff;
  border-color: rgba(255,79,216,.5);
  background: linear-gradient(135deg, rgba(255,79,216,.34), rgba(255,122,24,.22));
  box-shadow: 0 0 26px rgba(255,79,216,.35), 0 0 46px rgba(255,122,24,.16);
  animation: arkaPulse .55s ease-in-out infinite alternate;
}
.panel {
  box-shadow:
    0 30px 95px rgba(0,0,0,.55),
    0 0 75px rgba(81,246,255,.18),
    0 0 120px rgba(255,79,216,.08),
    inset 0 0 46px rgba(167,109,255,.09);
}
.primary-btn {
  transition: transform .16s ease, filter .16s ease, box-shadow .16s ease;
}
.primary-btn:hover {
  filter: brightness(1.08) saturate(1.15);
  box-shadow: 0 18px 55px rgba(81,246,255,.28), 0 0 42px rgba(109,255,159,.20);
}
.toast {
  border-color: rgba(255,79,216,.32);
  background: linear-gradient(135deg, rgba(5,10,24,.92), rgba(25,12,46,.78));
  box-shadow: 0 0 38px rgba(255,79,216,.17), 0 0 28px rgba(81,246,255,.13);
}
@keyframes arkaPulse {
  from { transform: scale(1); filter: brightness(1); }
  to { transform: scale(1.06); filter: brightness(1.25); }
}
@keyframes arkaAurora {
  from { opacity: .62; transform: translate3d(-1%, -1%, 0) scale(1.01); }
  to { opacity: .88; transform: translate3d(1%, 1%, 0) scale(1.035); }
}
@media (max-width: 900px) {
  .hud-bottom { bottom: 8px; left: 8px; right: 8px; }
  .hud-top { top: 8px; left: 8px; right: 8px; }
  .power-pill { padding: 6px 8px; font-size: 11px; }
}