:root {
    color-scheme: dark;
    --bg: #070c14;
    --panel: #111a2a;
    --text: #e9f3ff;
    --muted: #98afd1;
    --ink: #7efff4;
    --accent: #ff7cc9;
    --warn: #ffd166;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "IBM Plex Mono", "Segoe UI", "Helvetica Neue", monospace;
    background: radial-gradient(circle at top, #1a2740 0%, #070c14 58%);
    color: var(--text);
}

.shell {
    max-width: 1280px;
    margin: 0 auto;
    padding: 30px 22px 42px;
}

.hero {
    margin-bottom: 22px;
}

.back {
    display: inline-block;
    color: var(--muted);
    text-decoration: none;
    margin-bottom: 12px;
}

.back:hover {
    color: var(--text);
}

.badge {
    display: inline-block;
    border: 1px solid rgba(126, 255, 244, 0.45);
    color: var(--ink);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 6px 12px;
    margin-bottom: 10px;
}

h1 {
    margin: 0 0 8px;
    font-size: clamp(1.9rem, 4vw, 2.5rem);
}

.subtitle {
    margin: 0;
    color: var(--muted);
}

.layout {
    display: grid;
    gap: 20px;
    grid-template-columns: minmax(0, 1fr) 300px;
}

.panel {
    background: linear-gradient(165deg, rgba(18, 28, 44, 0.96), rgba(7, 12, 22, 0.97));
    border-radius: 18px;
    border: 1px solid rgba(126, 255, 244, 0.2);
    box-shadow: 0 20px 45px rgba(3, 8, 15, 0.55);
}

.stage-panel {
    position: relative;
    padding: 16px;
}

canvas {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    border: 1px solid rgba(126, 255, 244, 0.2);
    background: #050910;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
}

.scanlines {
    position: absolute;
    pointer-events: none;
    inset: 16px;
    border-radius: 12px;
    background: repeating-linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.06) 0px,
        rgba(255, 255, 255, 0.06) 1px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
    opacity: 0.16;
}

.hud {
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.label {
    margin: 0 0 6px;
    color: var(--muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.value {
    margin: 0;
    font-size: 1.22rem;
}

.hud-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid rgba(126, 255, 244, 0.16);
    background: rgba(4, 8, 14, 0.45);
}

.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 10px 14px;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    background: var(--ink);
    color: #081019;
}

.btn.ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid rgba(255, 124, 201, 0.56);
}

.tips {
    border: 1px solid rgba(126, 255, 244, 0.16);
    border-radius: 12px;
    padding: 12px 14px;
    color: var(--muted);
    font-size: 0.9rem;
}

.tips p {
    margin: 0;
    color: var(--text);
}

.tips ul {
    margin: 10px 0 0;
    padding-left: 18px;
    display: grid;
    gap: 8px;
}

.footer {
    margin-top: 18px;
    color: var(--muted);
    font-size: 0.86rem;
}

@media (max-width: 1000px) {
    .layout {
        grid-template-columns: 1fr;
    }
}