:root {
  --bg: #070c12;
  --panel: rgba(7, 16, 22, 0.86);
  --panel-border: rgba(95, 255, 180, 0.35);
  --grid: rgba(81, 255, 173, 0.07);
  --text: #d9ffef;
  --muted: #8ea89c;
  --neon-green: #57ffa8;
  --neon-red: #ff5666;
  --shadow-green: 0 0 24px rgba(87, 255, 168, 0.28);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background: radial-gradient(circle at top, #0d1620, var(--bg) 60%);
  color: var(--text);
  font-family: "Rajdhani", system-ui, sans-serif;
}

.app {
  position: relative;
  width: 100%;
  height: 100%;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  image-rendering: auto;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(2, 8, 12, 0.62);
  backdrop-filter: blur(3px);
  z-index: 20;
}

.overlay.hidden {
  display: none;
}

.panel {
  min-width: 320px;
  max-width: min(90vw, 680px);
  padding: 1.6rem 2rem;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow-green);
  text-align: center;
}

.panel h1,
.panel h2 {
  margin: 0.2rem 0 0.8rem;
  letter-spacing: 0.08em;
}

.mission-brief {
  text-align: left;
  margin: 1.2rem 0;
  padding: 1rem;
  background: rgba(0, 20, 15, 0.4);
  border-left: 3px solid var(--neon-green);
  border-radius: 6px;
}

.brief-header {
  margin: 0 0 0.6rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--neon-red);
  text-transform: uppercase;
}

.brief-text {
  margin: 0.5rem 0;
  line-height: 1.5;
  color: #c5e5d8;
  font-size: 0.95rem;
}

.highlight {
  color: var(--neon-green);
  font-weight: 600;
}

.stage-intel {
  margin: 0.8rem 0 0.4rem;
  color: #b4d4c5;
  font-size: 0.95rem;
}

.progress-indicator {
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(119, 255, 196, 0.2);
  color: var(--neon-green);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.panel--success h2 {
  color: var(--neon-green);
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.subtitle,
.hint {
  margin: 0.4rem 0;
  color: #b4d4c5;
}

.menu-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.6rem;
  margin: 0.65rem 0 0.4rem;
}

.menu-controls select {
  background: #0c1d18;
  color: var(--text);
  border: 1px solid rgba(119, 255, 196, 0.45);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  font: inherit;
}

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.72rem 1.4rem;
  font-size: 1.05rem;
  cursor: pointer;
  margin: 0.8rem 0;
  transition: transform 160ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.btn--primary {
  color: #052113;
  background: linear-gradient(90deg, #2dff9f, #8affcb);
  box-shadow: 0 8px 20px rgba(54, 255, 164, 0.28);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(54, 255, 164, 0.4);
}

.hud {
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  z-index: 10;
  pointer-events: none;
}

.hud__left,
.hud__right {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  border: 1px solid rgba(119, 255, 196, 0.25);
  background: rgba(4, 10, 14, 0.58);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
}

.hud__timer {
  border-color: rgba(255, 86, 102, 0.35);
}

.timer-value {
  color: var(--neon-green);
  font-weight: 600;
  font-size: 1.05rem;
  min-width: 48px;
}

.timer-warning {
  color: #ffaa66 !important;
  animation: pulse 1s ease-in-out infinite;
}

.timer-critical {
  color: var(--neon-red) !important;
  animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.hud-audio-btn {
  pointer-events: auto;
  border: 1px solid rgba(119, 255, 196, 0.35);
  border-radius: 10px;
  background: rgba(4, 10, 14, 0.58);
  color: var(--text);
  padding: 0.42rem 0.7rem;
  font: inherit;
  cursor: pointer;
  letter-spacing: 0.04em;
}

.hud-audio-btn:hover {
  border-color: rgba(119, 255, 196, 0.65);
}

.intel-panel {
  position: absolute;
  right: 14px;
  top: 66px;
  z-index: 10;
  min-width: 175px;
  border: 1px solid rgba(119, 255, 196, 0.25);
  border-radius: 10px;
  background: rgba(3, 9, 13, 0.72);
  padding: 0.55rem 0.65rem;
}

.intel-row {
  display: flex;
  justify-content: space-between;
  margin: 0.28rem 0;
  color: #b5d5c5;
}

.intel-row strong {
  color: var(--neon-green);
}

.toast {
  position: absolute;
  left: 50%;
  top: 76px;
  transform: translateX(-50%);
  z-index: 25;
  border: 1px solid rgba(118, 255, 196, 0.55);
  border-radius: 10px;
  background: rgba(6, 16, 20, 0.84);
  color: #8dffc4;
  padding: 0.45rem 0.75rem;
  letter-spacing: 0.05em;
  transition: opacity 220ms ease;
}

.label {
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.value {
  color: var(--text);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.cipher-hud-wrap {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  z-index: 10;
  width: min(94vw, 1000px);
  border: 1px solid rgba(119, 255, 196, 0.22);
  border-radius: 12px;
  background: rgba(3, 9, 13, 0.62);
  padding: 0.5rem 0.75rem 0.75rem;
}

.cipher-hud-title {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.cipher-hud {
  display: grid;
  grid-template-columns: repeat(8, minmax(96px, 1fr));
  gap: 0.38rem;
}

.cipher-slot {
  border: 1px dashed rgba(120, 174, 148, 0.55);
  border-radius: 8px;
  min-height: 34px;
  display: grid;
  place-items: center;
  color: #789689;
  font-size: 0.86rem;
  background: rgba(8, 20, 16, 0.34);
}

.cipher-slot--filled {
  border-style: solid;
  border-color: rgba(71, 255, 164, 0.65);
  color: var(--neon-green);
  box-shadow: inset 0 0 15px rgba(71, 255, 164, 0.18);
}

.overlay--ending {
  background: rgba(0, 7, 10, 0.74);
  backdrop-filter: blur(8px);
}

.ending-sequence {
  width: min(92vw, 900px);
  text-align: center;
}

.ending-eyebrow {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  letter-spacing: 0.24em;
  color: var(--neon-green);
  font-weight: 600;
}

.ending-detail {
  margin: 1rem 0;
  color: #b4d4c5;
  font-size: 1.05rem;
}

.ending-stats {
  margin: 1.2rem 0;
  padding: 0.8rem;
  background: rgba(0, 20, 15, 0.3);
  border-radius: 8px;
  color: #8ea89c;
  font-size: 0.95rem;
}

.ending-stats span {
  color: var(--neon-green);
  font-weight: 600;
}

.ending-epilogue {
  margin: 1.5rem 0 1.8rem;
  color: #8ea89c;
  font-style: italic;
  font-size: 0.92rem;
  line-height: 1.6;
}

.ending-cipher-lock {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
  margin-bottom: 1.2rem;
}

.ending-chip {
  border: 1px solid rgba(70, 255, 162, 0.7);
  border-radius: 8px;
  padding: 0.4rem 0.55rem;
  color: var(--neon-green);
  background: rgba(0, 25, 14, 0.45);
  opacity: 0;
  transform: translateY(8px);
  animation: lockIn 460ms ease forwards;
}

.ending-message {
  margin: 0;
  color: #8dffc4;
  text-shadow: 0 0 16px rgba(105, 255, 176, 0.45);
  letter-spacing: 0.06em;
  opacity: 0;
  animation: reveal 900ms ease forwards;
  animation-delay: 1.1s;
}

@keyframes lockIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes reveal {
  to {
    opacity: 1;
  }
}

@media (max-width: 760px) {
  .cipher-hud {
    grid-template-columns: repeat(4, minmax(100px, 1fr));
  }
}