:root {
    --bg: #07080b;
    --fg: #f3efe4;
    --muted: #9a9588;
    --line: rgba(243, 239, 228, 0.12);
    --accent: #d7ff4a;
    --board: #12141a;
    --font-display: "Syne", "Segoe UI", system-ui, sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

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

html, body { min-height: 100%; }

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-display);
    -webkit-font-smoothing: antialiased;
}

.grid-bg,
.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
}

.grid-bg {
    background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse at 50% 45%, #000 18%, transparent 72%);
}

.grain {
    z-index: 8;
    opacity: 0.18;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

.shell {
    position: relative;
    z-index: 2;
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 3rem;
}

.top {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.mark {
    color: var(--fg);
    border: 1px solid var(--line);
    padding: 0.35rem 0.55rem;
    text-decoration: none;
}

.mark:hover,
.back:hover { color: var(--accent); border-color: var(--accent); }

.back {
    margin-left: auto;
    color: inherit;
    text-decoration: none;
}

.hint {
    margin: 1.25rem 0 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--muted);
}

#score {
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
}

.board {
    width: min(100%, 1280px);
    aspect-ratio: 1280 / 720;
    position: relative;
    overflow: hidden;
    background: var(--board);
    border: 1px solid var(--line);
}

.grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    transform-origin: top left;
    background: repeating-linear-gradient(
        90deg,
        #16181f,
        #16181f 108px,
        #12141a 108px,
        #12141a 128px
    );
}

.user {
    position: absolute;
    width: 100px;
    height: 20px;
    background-color: var(--accent);
}

.block {
    position: absolute;
    background-color: #f3efe4;
}

.ball {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 10px;
    background-color: var(--accent);
    box-shadow: 0 0 16px rgba(215, 255, 74, 0.45);
}

.modal {
    display: none;
    position: absolute;
    inset: 0;
    z-index: 10;
    background: rgba(7, 8, 11, 0.72);
}

.modal .modal_content {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: #0e1014;
    color: var(--fg);
    border: 1px solid var(--line);
    padding: 1.5rem 1.75rem;
    min-width: 220px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-align: center;
    cursor: pointer;
}

.modal .modal_content h3 {
    font-family: var(--font-display);
    font-size: 1.6rem;
    margin-bottom: 0.6rem;
    letter-spacing: -0.03em;
}

.modal .modal_content p { color: var(--muted); margin-top: 0.25rem; }