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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, sans-serif;
}

.screen {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.screen.hidden {
  display: none;
}

/* ============================================
   Welcome Screen
   ============================================ */
#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#welcome-screen {
  background:
    radial-gradient(ellipse at 50% 30%, var(--glow-blue) 0%, transparent 50%);
  gap: clamp(2rem, 5vh, 4rem);
  padding-bottom: clamp(2.7rem, 6vh, 4rem);
}

#welcome-screen h1 {
  font-size: clamp(2.5rem, 7vh, 6rem);
  filter: drop-shadow(0 0 24px rgba(0, 200, 255, 0.35));
  animation: fadeDown 0.6s ease-out both;
  text-align: center;
}

#new-game-btn {
  padding: clamp(0.8rem, 1.6vh, 1.5rem) clamp(2.5rem, 5vw, 7rem);
  font-size: clamp(1rem, 2.2vh, 1.8rem);
  letter-spacing: 0.08em;
  animation: fadeUp 0.6s 0.3s ease-out both, btnPulse 2.5s 1s ease-in-out infinite;
}

#welcome-footer {
  position: absolute;
  bottom: clamp(1.2rem, 3vh, 2.5rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeUp 0.6s 0.6s ease-out both;
}

.footer-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

#welcome-footer a {
  color: var(--text-secondary);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: clamp(13px, 1.5vw, 16px);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color var(--transition-normal), filter var(--transition-normal);
}

#welcome-footer a:hover {
  filter: drop-shadow(0 0 6px rgba(0, 200, 255, 0.2));
}

.footer-dot {
  color: var(--text-secondary);
  opacity: 0.4;
}

#version-label {
  color: var(--text-secondary);
  font-family: system-ui, -apple-system, sans-serif;
  font-size: clamp(13px, 1.5vw, 16px);
  font-weight: 500;
  letter-spacing: 0.06em;
  opacity: 0.6;
}

/* ============================================
   Lobby Screen
   ============================================ */
#lobby-screen {
  background:
    radial-gradient(ellipse at 50% 20%, var(--glow-blue) 0%, transparent 50%);
  justify-content: space-evenly;
  padding: 4vh 2rem 4vh;
}


#lobby-screen h1 {
  font-size: clamp(2rem, 5vh, 5rem);
  filter: drop-shadow(0 0 18px rgba(0, 200, 255, 0.3));
  animation: fadeDown 0.6s ease-out both;
  text-align: center;
}

#qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeUp 0.6s 0.15s ease-out both, qrGlow 3s 1s ease-in-out infinite;
}

@keyframes qrGlow {
  0%, 100% { filter: drop-shadow(0 0 8px rgba(0, 200, 255, 0.08)); }
  50%      { filter: drop-shadow(0 0 16px rgba(0, 200, 255, 0.18)); }
}

#qr-label {
  margin: clamp(4px, 0.8vh, 10px) 0 0;
  font-size: clamp(14px, 2.4vh, 26px);
  color: rgba(0, 200, 255, 0.7);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

#qr-code {
  width: clamp(180px, 32vh, 400px);
  height: clamp(180px, 32vh, 400px);
  border: 1px solid rgba(0, 200, 255, 0.15);
  border-radius: clamp(8px, 1vh, 16px);
  background: var(--color-white);
  padding: clamp(6px, 1vh, 14px);
  box-shadow: 0 0 24px rgba(0, 200, 255, 0.08);
}

#join-url {
  font-size: clamp(0.85rem, 2vh, 1.4rem);
  color: var(--text-secondary);
  margin-top: 0.3rem;
  letter-spacing: 0.02em;
}

#player-list {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: clamp(0.6rem, 1.2vw, 1.2rem);
  justify-content: center;
  justify-items: center;
  min-height: clamp(50px, 8vh, 90px);
  animation: fadeIn 0.4s 0.3s ease-out both;
}

.player-card {
  flex-direction: column;
  align-items: center;
  gap: clamp(6px, 1vh, 10px);
  justify-content: center;
  padding: clamp(0.6rem, 1.2vh, 1rem) clamp(1.2rem, 2vw, 2.2rem);
  font-size: clamp(0.9rem, 2vh, 1.4rem);
  min-width: clamp(100px, 12vw, 180px);
}

.player-card.empty {
  background: transparent;
  border: 2px dashed var(--text-secondary);
  box-shadow: none;
  color: var(--text-secondary);
}

.player-card.empty .level-placeholder {
  opacity: 0.45;
  pointer-events: none;
  border-top-color: var(--text-secondary);
}

@keyframes slotPopIn {
  0%   { transform: scale(0.6); opacity: 0; }
  60%  { transform: scale(1.08); opacity: 1; }
  80%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}

.player-card.join-pop {
  animation: slotPopIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.player-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.level-controls {
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 0.5vw, 0.4rem);
  padding-top: clamp(4px, 0.8vh, 8px);
  border-top: 1px solid var(--bg-glass);
  width: 100%;
  justify-content: center;
}

.level-heading {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(0.8rem, 1.8vh, 1.2rem);
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  margin-right: clamp(0.15rem, 0.3vw, 0.3rem);
}

.level-label {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(0.9rem, 2vh, 1.4rem);
  font-weight: 700;
  color: var(--text-primary);
  min-width: 2em;
  text-align: center;
}

.level-btn {
  width: clamp(24px, 3.6vh, 36px);
  height: clamp(24px, 3.6vh, 36px);
  border: none;
  border-radius: var(--radius-xs);
  background: color-mix(in srgb, white 8%, transparent);
  color: var(--text-primary);
  font-size: 0;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.level-btn:hover:not(:disabled) {
  background: color-mix(in srgb, white 15%, transparent);
}

.level-btn:disabled {
  opacity: 0.25;
  cursor: default;
}

#start-btn {
  padding: clamp(0.7rem, 1.4vh, 1.3rem) clamp(2rem, 4vw, 6rem);
  font-size: clamp(1rem, 2vh, 1.6rem);
  letter-spacing: 0.08em;
  animation: fadeUp 0.5s 0.45s ease-out both;
}

#start-btn:disabled {
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: not-allowed;
}

#start-btn:not(:disabled) {
  animation: fadeUp 0.5s 0.45s ease-out both, btnPulse 2.5s 1.2s ease-in-out infinite;
}

/* ============================================
   Game Screen
   ============================================ */
#game-screen {
  position: relative;
  padding: 0;
  background: var(--bg-primary);
}

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

#countdown-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(6rem, 15vh, 14rem);
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--color-white);
  text-shadow:
    0 0 30px color-mix(in srgb, var(--accent-blue) 90%, transparent),
    0 0 60px color-mix(in srgb, var(--accent-blue) 50%, transparent),
    0 0 120px color-mix(in srgb, var(--accent-blue) 20%, transparent);
  background:
    radial-gradient(ellipse at 50% 50%, color-mix(in srgb, var(--accent-blue) 8%, transparent) 0%, transparent 60%),
    color-mix(in srgb, var(--bg-primary) 80%, transparent);
  z-index: 10;
}

#countdown-overlay.hidden {
  display: none;
}

/* ============================================
   Game Toolbar (fullscreen + pause)
   ============================================ */
#game-toolbar {
  position: absolute;
  top: clamp(10px, 1.5vh, 20px);
  right: clamp(10px, 1.5vw, 20px);
  z-index: 50;
  display: flex;
  gap: clamp(6px, 0.8vh, 10px);
  transition: opacity var(--transition-normal);
}

#game-toolbar.toolbar-autohide {
  opacity: 0;
  pointer-events: none;
}

#game-toolbar.hidden {
  display: none;
}

#game-toolbar .icon-btn {
  width: clamp(36px, 4vh, 52px);
  height: clamp(36px, 4vh, 52px);
}

#game-toolbar .hidden {
  display: none;
}

#pause-btn .pause-icon::before,
#pause-btn .pause-icon::after {
  width: clamp(3px, 0.4vh, 5px);
  height: clamp(12px, 1.6vh, 18px);
  border-radius: 1px;
}

#pause-btn:hover .pause-icon::before,
#pause-btn:hover .pause-icon::after {
  background: rgba(255, 255, 255, 0.8);
}

#pause-overlay h1 {
  font-size: clamp(1.6rem, 4vh, 3.5rem);
  margin-bottom: clamp(1.5rem, 3vh, 3rem);
}

#pause-buttons {
  display: flex;
  gap: clamp(0.8rem, 1.5vw, 1.5rem);
}

#pause-continue-btn,
#pause-newgame-btn,
#reconnect-btn {
  padding: clamp(0.6rem, 1.2vh, 1.2rem) clamp(2rem, 4vw, 4rem);
  font-size: clamp(0.85rem, 1.6vh, 1.2rem);
  letter-spacing: 0.06em;
}

#reconnect-btn.hidden {
  display: none;
}

/* ============================================
   Cursor Auto-Hide
   ============================================ */
.cursor-hidden,
.cursor-hidden * {
  cursor: none !important;
}

/* ============================================
   Results Overlay
   ============================================ */
#results-screen {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  background: radial-gradient(ellipse at 50% 30%, var(--winner-glow, rgba(255, 215, 0, 0.06)) 0%, transparent 60%),
              var(--overlay-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fadeIn 0.5s ease both;
}

#results-screen h1 {
  font-size: clamp(1.6rem, 4vh, 3.5rem);
  letter-spacing: 0.15em;
  margin-bottom: clamp(1rem, 3vh, 3rem);
  filter: drop-shadow(0 0 24px rgba(0, 200, 255, 0.35));
}

#results-list {
  display: flex;
  flex-direction: column;
  gap: clamp(0.4rem, 0.8vh, 0.8rem);
  width: 90%;
  max-width: 700px;
}

.result-row {
  gap: 1rem;
  padding: clamp(0.6rem, 1.2vh, 1.2rem) clamp(1rem, 2vw, 2rem) clamp(0.6rem, 1.2vh, 1.2rem) clamp(0.5rem, 1vw, 1rem);
}

.result-rank {
  font-size: clamp(1.2rem, 2.5vh, 2.2rem);
  font-weight: 700;
  width: 4rem;
  flex-shrink: 0;
}

.result-info {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  min-width: 0;
}

.result-name {
  font-size: clamp(1.2rem, 2.5vh, 2.2rem);
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.result-stats {
  display: flex;
  gap: 1.5rem;
  font-size: clamp(1rem, 2.2vh, 1.8rem);
  color: var(--text-secondary);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.result-stats span {
  white-space: nowrap;
  display: inline-block;
  min-width: 5em;
  text-align: right;
}

#results-buttons {
  display: flex;
  gap: clamp(0.8rem, 1.5vw, 1.5rem);
  margin-top: clamp(1.5rem, 3vh, 3rem);
}

#play-again-btn,
#new-game-results-btn {
  padding: clamp(0.6rem, 1.2vh, 1.2rem) clamp(2rem, 4vw, 4rem);
  font-size: clamp(0.85rem, 1.6vh, 1.2rem);
  letter-spacing: 0.06em;
}

#play-again-btn {
  animation: resultsBtnIn 0.5s 0.6s ease-out both, btnPulse 2.5s 1.5s infinite;
}

#new-game-results-btn {
  animation: resultsBtnIn 0.5s 0.7s ease-out both;
}

/* ============================================
   Mobile Screen Hint
   ============================================ */
#mobile-hint {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  flex-direction: column;
  align-items: center;
  background:
    radial-gradient(ellipse at 50% 30%, var(--glow-blue) 0%, transparent 50%),
    var(--bg-primary);
  text-align: center;
  padding: 64px 2rem 2rem;
}

#mobile-hint h1 {
  font-size: clamp(1.4rem, 7vw, 2.2rem);
  filter: drop-shadow(0 0 8px var(--glow-cyan));
}

#mobile-hint-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#mobile-hint-heading {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(1.2rem, 5.8vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-cyan);
}

#mobile-hint-detail {
  font-size: clamp(1rem, 4.5vw, 1.2rem);
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  line-height: 1.5;
  max-width: 28ch;
}

#mobile-hint .btn {
  font-size: 0.9rem;
  padding: 14px 24px;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}

/* Show only on phone-sized screens */
@media (max-width: 768px) and (orientation: portrait) {
  #mobile-hint { display: flex; }
}

@media (max-width: 568px) and (orientation: landscape) {
  #mobile-hint { display: flex; }
}