:root {
    color-scheme: dark;
    font-family: "IBM Plex Mono", "Fira Code", "JetBrains Mono", monospace;
    --bg: #0b0f1a;
    --panel: #141b2a;
    --panel-glow: rgba(0, 255, 210, 0.12);
    --accent: #62f5ff;
    --accent-2: #ff9bff;
    --text: #e7f0ff;
    --muted: #94a3c7;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top, #1a2541, #0b0f1a 55%, #05070f 100%);
    color: var(--text);
}

.racer {
    max-width: 980px;
    margin: 0 auto;
    padding: 32px 20px 48px;
}

.hero {
    margin-bottom: 24px;
}

.back {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.95rem;
}

h1 {
    margin: 12px 0 4px;
    font-size: clamp(2rem, 4vw, 3rem);
}

.subtitle {
    color: var(--accent-2);
    margin: 0 0 12px;
}

.lead {
    color: var(--muted);
    max-width: 700px;
    line-height: 1.6;
}

.panel {
    background: var(--panel);
    border: 1px solid rgba(120, 160, 255, 0.2);
    border-radius: 18px;
    padding: 18px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), inset 0 0 40px var(--panel-glow);
}

.hud {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
    padding: 8px 4px 16px;
    color: var(--accent);
    font-size: 0.95rem;
}

.audio-toggle {
    margin-left: auto;
    background: transparent;
    color: var(--accent);
    border: 1px solid rgba(98, 245, 255, 0.45);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 0.8rem;
    cursor: pointer;
}

.audio-toggle.is-on {
    color: #ffe08a;
    border-color: #ffe08a;
}

.hud-item span {
    color: var(--text);
    font-weight: 700;
}

.canvas-wrap {
    position: relative;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid rgba(100, 200, 255, 0.25);
}

#road {
    width: 100%;
    height: 520px;
    display: block;
    background: #0d1220;
    touch-action: none;
}

.scanlines {
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.2) 0px,
        rgba(0, 0, 0, 0.2) 1px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
    mix-blend-mode: multiply;
    pointer-events: none;
}

.vignette {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, transparent 55%, rgba(0, 0, 0, 0.55));
    pointer-events: none;
}

.tips {
    margin-top: 16px;
    color: var(--muted);
    font-size: 0.95rem;
}

.tips-title {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 6px;
}

@media (max-width: 640px) {
    #road {
        height: 360px;
    }
}