:root {
  --bg:           #07071a;
  --bg-elev:      #11122a;
  --surface:      #1a1b3a;
  --text:         #e8eaff;
  --muted:        #8a8db0;
  --border:       #2a2c52;
  --neon-pink:    #ff2d75;
  --neon-cyan:    #4ee7f9;
  --neon-yellow:  #ffe156;
  --neon-purple:  #b14aff;
  --accent:       var(--neon-cyan);
  --radius:       6px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  min-height: 100vh;
}

a { color: var(--neon-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--neon-cyan);
  letter-spacing: 0.15em;
  text-decoration: none;
  text-shadow: 0 0 20px var(--neon-cyan);
}

.site-nav { display: flex; gap: 2rem; }
.site-nav a { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.1em; text-transform: uppercase; }
.site-nav a:hover { color: var(--text); text-decoration: none; }

main { max-width: 900px; margin: 0 auto; padding: 3rem 2rem; }

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--neon-cyan);
  color: #000;
  border: none;
  padding: 0.75rem 1.75rem;
  font-weight: 800;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 0.95rem;
  transition: background 0.15s, box-shadow 0.15s;
}
.btn-primary:hover {
  background: var(--neon-yellow);
  box-shadow: 0 0 24px var(--neon-yellow);
  text-decoration: none;
}

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--neon-cyan);
  border: 1px solid var(--neon-cyan);
  padding: 0.7rem 1.5rem;
  font-weight: 700;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: background 0.15s, box-shadow 0.15s;
  text-decoration: none;
}
.btn-secondary:hover {
  background: rgba(78,231,249,0.1);
  box-shadow: 0 0 12px rgba(78,231,249,0.3);
  text-decoration: none;
}

.btn-huge { font-size: 1.4rem; padding: 1rem 3rem; }

/* Hero */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
}
.hero-title {
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}
.neon-cyan {
  color: var(--neon-cyan);
  text-shadow: 0 0 30px var(--neon-cyan);
}
.hero-sub {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

/* How it works */
.how-it-works {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 4rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card-icon {
  font-size: 2rem;
  font-weight: 800;
  color: var(--neon-pink);
  margin-bottom: 0.75rem;
}
.card h3 { margin-bottom: 0.5rem; font-size: 1rem; }
.card p { color: var(--muted); font-size: 0.9rem; line-height: 1.5; }

/* Play page */
.play-page h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 20px var(--neon-cyan);
}
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; color: var(--muted); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; }
input[type="text"], input[type="email"], input[type="url"] {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s;
}
input:focus { border-color: var(--neon-cyan); }

.source-picker {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}
.btn-source {
  flex: 1;
  max-width: 220px;
  background: var(--surface);
  border: 2px solid var(--border);
  color: var(--text);
  padding: 1rem;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  border-radius: var(--radius);
  transition: border-color 0.15s, color 0.15s;
}
.btn-source:hover, .btn-source.active {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
}

.source-form { margin-bottom: 1.5rem; }
.hidden { display: none !important; }

.file-drop {
  display: block;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s;
  max-width: 480px;
  margin-bottom: 1rem;
}
.file-drop:hover, .file-drop.drag-over { border-color: var(--neon-cyan); color: var(--neon-cyan); }
.file-drop small { display: block; margin-top: 0.4rem; font-size: 0.8rem; }

#yt-url { margin-bottom: 1rem; display: block; }
.error-msg { color: var(--neon-pink); font-size: 0.9rem; margin-top: 0.5rem; }

/* Wait page */
.wait-page { text-align: center; padding-top: 3rem; }
.wait-page h1 { font-size: 2rem; font-weight: 800; letter-spacing: 0.1em; color: var(--neon-cyan); margin-bottom: 1rem; }
.wait-page p { color: var(--muted); margin-bottom: 1rem; }
.progress-bar-wrap {
  width: 100%;
  max-width: 500px;
  margin: 1.5rem auto;
  background: var(--surface);
  border-radius: 4px;
  height: 12px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--neon-cyan);
  box-shadow: 0 0 12px var(--neon-cyan);
  transition: width 0.3s ease;
}
#progress-pct { font-size: 1.2rem; font-weight: 800; color: var(--neon-cyan); }
.muted { color: var(--muted) !important; }

/* Game page */
#game-root {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  overflow: hidden;
}
#game-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}
#hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1.2rem 2rem;
  pointer-events: none;
  z-index: 10;
}
.hud-score, .hud-combo {
  text-align: center;
  line-height: 1.1;
}
.hud-score span, .hud-combo span {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--neon-cyan);
  text-shadow: 0 0 20px var(--neon-cyan);
}
.hud-score, .hud-combo {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}
.hud-title {
  font-size: 0.8rem;
  color: var(--text);
  letter-spacing: 0.1em;
  text-align: center;
  max-width: 40%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#countdown {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10rem;
  font-weight: 800;
  color: var(--neon-cyan);
  text-shadow: 0 0 60px var(--neon-cyan);
  z-index: 20;
  pointer-events: none;
}
#pause-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(7,7,26,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 30;
}
.pause-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 3rem;
  text-align: center;
}
.pause-box h2 { font-size: 2rem; color: var(--neon-cyan); margin-bottom: 1.5rem; letter-spacing: 0.2em; }
.pause-box .btn-primary, .pause-box .btn-secondary { margin: 0.5rem; }

/* Start overlay (tap-to-start, needed to unlock mobile audio) */
#start-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 1.5rem;
  text-align: center;
  background: rgba(7, 7, 26, 0.72);
  backdrop-filter: blur(4px);
}
#start-overlay .start-title {
  font-size: 1rem;
  color: var(--text);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  max-width: 90vw;
}
#start-overlay .start-hint {
  font-size: 0.8rem;
  color: var(--muted);
  max-width: 360px;
  line-height: 1.7;
}

/* On-screen pause button */
#pause-btn {
  position: fixed;
  top: 0.8rem;
  right: 0.8rem;
  z-index: 15;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(26, 27, 58, 0.7);
  border: 1px solid var(--border);
  color: var(--neon-cyan);
  font-family: inherit;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}
#pause-btn:hover { border-color: var(--neon-cyan); }

/* Stop the browser hijacking touch gestures during play */
#game-root {
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Responsive HUD for small screens */
@media (max-width: 640px) {
  #hud { padding: 0.7rem 0.9rem; }
  .hud-score span, .hud-combo span { font-size: 1.6rem; }
  .hud-title { font-size: 0.65rem; max-width: 32%; }
  .hud-combo { margin-right: 3rem; } /* clear the pause button */
  #countdown { font-size: 6rem; }
  #start-overlay .start-title { font-size: 0.85rem; }
}

/* Result page */
.result-page { text-align: center; padding-top: 2rem; }
.result-page h1 { font-size: 2.5rem; font-weight: 800; color: var(--neon-pink); letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.result-song { color: var(--muted); font-size: 1rem; margin-bottom: 2rem; }
.result-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin: 2rem 0;
}
.stat-label { font-size: 0.7rem; color: var(--muted); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 0.4rem; }
.stat-value { font-size: 2.5rem; font-weight: 800; color: var(--neon-cyan); text-shadow: 0 0 20px var(--neon-cyan); }
.result-actions { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; margin: 2rem 0; }

/* Leaderboard */
.leaderboard-page h1, .leaderboard-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--neon-cyan);
  letter-spacing: 0.12em;
  margin-bottom: 1.5rem;
}
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.leaderboard-table th {
  text-align: left;
  padding: 0.6rem 1rem;
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table tr:hover td { background: var(--surface); }
.leaderboard-table td:first-child { color: var(--muted); }
.leaderboard-section { margin-top: 3rem; }

/* Sign in */
.signin-page { max-width: 420px; margin: 0 auto; padding-top: 2rem; }
.signin-page h1 { font-size: 1.8rem; font-weight: 800; color: var(--neon-cyan); letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.signin-form { margin-top: 1.5rem; }
.signin-form label { display: block; color: var(--muted); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; }
.signin-form input { width: 100%; margin-bottom: 1rem; }
.alert-success { background: rgba(78,231,249,0.1); border: 1px solid var(--neon-cyan); color: var(--neon-cyan); padding: 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.alert-error { background: rgba(255,45,117,0.1); border: 1px solid var(--neon-pink); color: var(--neon-pink); padding: 1rem; border-radius: var(--radius); margin-bottom: 1rem; }