:root {
  /* Nokia-style green monochrome theme */
  --bg-color: #000000;
  --grid-color: #07340b;
  --primary: #7cfc00; /* bright green */
  --secondary: #66cdaa;
  --danger: #ff0055;
  --text: #9ef08a;
  --ui-overlay: rgba(0, 0, 0, 0.6);
  --font-stack: "Courier New", Courier, monospace;
}

* {
  box-sizing: border-box;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  overflow: hidden;
  background-color: var(--bg-color);
  color: var(--text);
  font-family: var(--font-stack);
  height: 100vh;
  height: 100dvh; /* Use dynamic viewport unit for mobile */
  display: flex;
  align-items: center;
  justify-content: center;
}

#app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

#hud-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: var(--grid-color);
  border-bottom: 2px solid var(--primary);
  height: 60px;
  flex-shrink: 0;
}

.stat-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-group .label {
  font-size: 0.7rem;
  opacity: 0.8;
  color: var(--secondary);
}

.stat-group span:not(.label) {
  font-size: 1.4rem;
  font-weight: bold;
}

#game-wrapper {
  flex-grow: 1;
  position: relative;
  background: #000;
  border-left: 1px solid var(--grid-color);
  border-right: 1px solid var(--grid-color);
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#ui-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.screen {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  padding: 2rem;
  border: 1px solid var(--grid-color);
  border-radius: 8px;
  text-align: center;
  pointer-events: auto;
  min-width: 300px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
  transition: opacity 0.3s ease;
}

.hidden {
  opacity: 0;
  pointer-events: none;
  display: none; /* Fallback */
}

h1 {
  font-size: 3rem;
  letter-spacing: 4px;
  margin-bottom: 2rem;
  text-shadow: 0 0 6px var(--primary);
}

.accent {
  color: var(--primary);
}

.menu-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.level-selector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.5rem;
  border: 1px solid var(--grid-color);
  background: rgba(0, 0, 0, 0.4);
}

.level-selector label {
  font-size: 0.7rem;
  opacity: 0.8;
  color: var(--secondary);
}

.level-selector select {
  background: var(--bg-color);
  color: var(--primary);
  border: 1px solid var(--primary);
  font-family: var(--font-stack);
  padding: 5px;
  font-size: 1rem;
}

.btn {
  background: transparent;
  border: 2px solid var(--grid-color);
  color: var(--text);
  padding: 1rem 2rem;
  font-family: inherit;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 2px;
  border-radius: 0;
}

.btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
}

.btn.primary {
  background: var(--primary);
  color: black;
  border-color: var(--primary);
}

.btn.secondary {
  border-color: var(--secondary);
  color: var(--secondary);
}

#hud {
  position: absolute;
  top: 20px;
  left: 20px;
  right: 20px;
  display: flex;
  justify-content: flex-start;
  gap: 16px;
  align-items: center;
  pointer-events: none;
}

.score-box {
  display: flex;
  flex-direction: column;
  background: #021202;
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px solid var(--grid-color);
  pointer-events: auto;
}

.label {
  font-size: 0.8rem;
  opacity: 0.6;
}

#score-value,
#highscore-value {
  font-size: 2rem;
  font-weight: 800;
}

#level-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

/* Make UI more touch friendly on mobile */
@media (max-width: 600px) {
  .screen {
    padding: 1rem;
    min-width: unset;
    width: 90%;
  }
  .btn {
    padding: 0.8rem 1rem;
    font-size: 1rem;
  }
  #hud {
    top: 12px;
    left: 12px;
    right: 12px;
    gap: 8px;
  }
}

.settings-grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
  text-align: left;
}

.settings-grid label {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

select {
  background: #000;
  color: #fff;
  border: 1px solid var(--grid-color);
  padding: 5px;
}

/* Mobile Controls */
#mobile-controls {
  display: none; /* Hidden by default on large screens */
  padding: 10px;
  background: var(--bg-color);
  border-top: 2px solid var(--grid-color);
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
  /* Remove fixed height to allow it to be just big enough */
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}

.d-pad {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  margin-bottom: 10px;
}

.d-row {
  display: flex;
  gap: 52px; /* Space for the middle */
}

.d-btn {
  width: 68px;
  height: 68px;
  border: 2px solid var(--primary);
  background: rgba(0, 20, 0, 0.5);
  color: var(--primary);
  font-size: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  border-radius: 8px;
  user-select: none;
  touch-action: manipulation;
  transition: all 0.1s;
  font-family: var(--font-stack);
}

.d-btn:active {
  background: var(--primary);
  color: #000;
  transform: scale(0.95);
}

/* Show controls on screens smaller than 768px */
@media (max-width: 768px) {
  #app-container.playing #mobile-controls {
    display: flex;
  }
}