* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    width: 100%; height: 100%;
    background: #0a0e1a;
    overflow: hidden;
    font-family: 'Courier New', monospace;
    color: #e0e8ff;
}
#gameCanvas {
    display: block;
    width: 100%; height: 100%;
    position: absolute; top: 0; left: 0;
}
#ui-overlay {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
#hud {
    position: absolute; top: 16px; left: 0;
    width: 100%;
    display: flex; justify-content: space-between;
    padding: 0 24px;
    font-size: 20px;
    text-shadow: 0 0 8px rgba(100,180,255,0.6);
    z-index: 10;
}
#hud span { display: inline-block; min-width: 120px; }
#hud .speed { color: #4fc3f7; }
#hud .timer { color: #fff; text-align: right; }
.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    text-align: center;
    pointer-events: auto;
}
.screen.active { display: flex; }
#title-screen h1 {
    font-size: 72px;
    letter-spacing: 12px;
    color: #4fc3f7;
    text-shadow: 0 0 30px rgba(79,195,247,0.5), 0 0 60px rgba(79,195,247,0.3);
    margin-bottom: 12px;
}
#title-screen .subtitle {
    font-size: 16px;
    color: #90a4ae;
    margin-bottom: 40px;
}
.prompt {
    font-size: 18px;
    color: #ffcc80;
    animation: blink 1.2s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
#countdown {
    font-size: 120px;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 0 40px rgba(255,255,255,0.5);
}
#finish-screen h2 {
    font-size: 36px;
    color: #4fc3f7;
    margin-bottom: 8px;
}
#finish-screen .final-time {
    font-size: 64px;
    color: #fff;
    text-shadow: 0 0 20px rgba(255,255,255,0.4);
    margin-bottom: 24px;
}
#name-entry {
    display: none;
    flex-direction: column;
    align-items: center;
    pointer-events: auto;
}
#name-entry.active { display: flex; }
#name-entry h3 {
    font-size: 24px;
    color: #ffcc80;
    margin-bottom: 16px;
}
#name-entry .letters {
    display: flex; gap: 16px;
    font-size: 64px;
    margin-bottom: 16px;
}
#name-entry .letter-slot {
    width: 70px; height: 80px;
    border: 2px solid #4fc3f7;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    position: relative;
}
#name-entry .letter-slot.active {
    border-color: #ffcc80;
    box-shadow: 0 0 15px rgba(255,204,128,0.4);
}
#name-entry .letter-slot .arrow {
    position: absolute;
    font-size: 18px;
    color: #4fc3f7;
}
#name-entry .letter-slot .arrow.up { top: -22px; }
#name-entry .letter-slot .arrow.down { bottom: -22px; }
#name-entry .hint {
    font-size: 14px;
    color: #90a4ae;
}
#leaderboard-screen h2 {
    font-size: 36px;
    color: #4fc3f7;
    margin-bottom: 20px;
    letter-spacing: 6px;
}
#leaderboard-screen table {
    border-collapse: collapse;
    margin-bottom: 30px;
}
#leaderboard-screen th, #leaderboard-screen td {
    padding: 6px 20px;
    font-size: 22px;
    text-align: left;
}
#leaderboard-screen th {
    color: #90a4ae;
    border-bottom: 1px solid #334;
}
#leaderboard-screen td { color: #e0e8ff; }
#leaderboard-screen tr.highlight td {
    color: #ffcc80;
    text-shadow: 0 0 8px rgba(255,204,128,0.4);
}
#leaderboard-screen .rank { color: #4fc3f7; min-width: 40px; }
#track-progress {
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 300px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
}
#track-progress .marker {
    position: absolute;
    width: 14px; height: 14px;
    background: #4fc3f7;
    border-radius: 50%;
    left: -3px;
    box-shadow: 0 0 8px rgba(79,195,247,0.6);
    transition: top 0.1s;
}
.controls-hint {
    font-size: 13px;
    color: #607d8b;
    margin-top: 20px;
    line-height: 1.8;
}