:root {
    color-scheme: dark;
    --bg: #11151d;
    --bg-deep: #080b11;
    --panel: rgba(28, 36, 50, 0.9);
    --panel-strong: #1d2533;
    --panel-edge: rgba(190, 212, 255, 0.14);
    --text: #e9f0ff;
    --muted: #9fb0cc;
    --accent: #5ec8ff;
    --accent-bright: #93dcff;
    --shadow: rgba(0, 0, 0, 0.45);

    /* Color-blind-aware block palette (Okabe-Ito derived), reinforced by glyphs. */
    --c0: #56b4e9; /* sky blue   ● */
    --c1: #e69f00; /* orange     ▲ */
    --c2: #cc79a7; /* pink       ■ */
    --c3: #f0e442; /* yellow     ◆ */
    --c0-deep: #2f86bb;
    --c1-deep: #b97f00;
    --c2-deep: #9c5680;
    --c3-deep: #c4b71f;
}

[data-theme="light"] {
    color-scheme: light;
    --bg: #e8eef9;
    --bg-deep: #cdd9ee;
    --panel: rgba(255, 255, 255, 0.92);
    --panel-strong: #ffffff;
    --panel-edge: rgba(40, 64, 110, 0.16);
    --text: #1d2a40;
    --muted: #5a6b86;
    --shadow: rgba(40, 60, 100, 0.22);
}

* { box-sizing: border-box; }
html { min-height: 100%; }

body {
    min-height: 100vh;
    margin: 0;
    padding: 22px 18px 82px;
    overflow-x: hidden;
    color: var(--text);
    background:
        radial-gradient(circle at 14% 12%, rgba(94, 200, 255, 0.12), transparent 28rem),
        radial-gradient(circle at 88% 80%, rgba(204, 121, 167, 0.1), transparent 30rem),
        linear-gradient(155deg, var(--bg), var(--bg-deep));
    font-family: Inter, ui-rounded, "SF Pro Rounded", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    transition: color 180ms ease, background-color 180ms ease;
}

body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    opacity: 0.2;
    pointer-events: none;
    background-image: radial-gradient(rgba(255,255,255,0.16) 0.7px, transparent 0.7px);
    background-size: 13px 13px;
    mask-image: linear-gradient(to bottom, black, transparent 86%);
}

button, select { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.game-shell { width: min(100%, 720px); margin: 0 auto; }

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 14px;
}

.potato-home-link {
    color: var(--muted);
    text-decoration: none;
    font-weight: 650;
    font-size: 0.9rem;
    display: inline-flex;
    gap: 6px;
    align-items: center;
}
.potato-home-link:hover { color: var(--text); }

.toolbar { display: flex; gap: 8px; }

.icon-button {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--panel-edge);
    background: var(--panel);
    color: var(--text);
    font-size: 1.1rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: transform 120ms ease, background-color 160ms ease;
}
.icon-button:hover { background: var(--panel-strong); }
.icon-button:active { transform: scale(0.93); }

.hero { text-align: center; margin-bottom: 12px; }
.eyebrow {
    margin: 0 0 2px;
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--accent);
}
#game-title { margin: 0; font-size: clamp(1.7rem, 6vw, 2.4rem); font-weight: 800; letter-spacing: -0.01em; }
.subtitle { margin: 4px 0 0; color: var(--muted); font-size: 0.92rem; }

.stats {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 16px auto 6px;
    flex-wrap: wrap;
}
.stat {
    min-width: 92px;
    padding: 8px 14px;
    border-radius: 14px;
    background: var(--panel);
    border: 1px solid var(--panel-edge);
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-label { font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); font-weight: 650; }
.stat-value { font-size: 1.35rem; font-weight: 800; font-variant-numeric: tabular-nums; }

.game-status { text-align: center; color: var(--muted); font-size: 0.86rem; min-height: 1.2em; margin: 8px 0 14px; }

.board-wrap {
    position: relative;
    margin: 0 auto;
    width: fit-content;
    touch-action: manipulation;
}

.game-board {
    position: relative;
    margin: 0 auto;
    border-radius: 16px;
    background: rgba(8, 11, 17, 0.55);
    border: 1px solid var(--panel-edge);
    box-shadow: inset 0 2px 18px rgba(0, 0, 0, 0.4), 0 14px 40px var(--shadow);
    overflow: hidden;
    /* width/height set inline by JS via --cell, --cols, --rows */
    width: calc(var(--cell) * var(--cols));
    height: calc(var(--cell) * var(--rows));
}

[data-theme="light"] .game-board { background: rgba(255, 255, 255, 0.5); }

.block {
    position: absolute;
    left: 0;
    top: 0;
    width: var(--cell);
    height: var(--cell);
    padding: 2px;
    will-change: transform;
    transition: transform 200ms cubic-bezier(0.22, 1, 0.36, 1), opacity 160ms ease;
}

.block-face {
    width: 100%;
    height: 100%;
    border-radius: 22%;
    display: grid;
    place-items: center;
    font-size: calc(var(--cell) * 0.34);
    font-weight: 800;
    color: rgba(0, 0, 0, 0.32);
    box-shadow: inset 0 calc(var(--cell) * -0.12) 0 rgba(0, 0, 0, 0.18),
                inset 0 calc(var(--cell) * 0.06) 0 rgba(255, 255, 255, 0.28);
    transition: transform 120ms ease, filter 120ms ease, box-shadow 120ms ease;
}

.block[data-color="0"] .block-face { background: var(--c0); }
.block[data-color="1"] .block-face { background: var(--c1); }
.block[data-color="2"] .block-face { background: var(--c2); }
.block[data-color="3"] .block-face { background: var(--c3); }

.block.preview .block-face {
    transform: scale(0.9);
    filter: brightness(1.18);
    box-shadow: inset 0 0 0 calc(var(--cell) * 0.08) rgba(255, 255, 255, 0.55),
                0 0 calc(var(--cell) * 0.2) rgba(255, 255, 255, 0.35);
}

.block.popping {
    opacity: 0;
    transition: transform 200ms ease, opacity 200ms ease;
    pointer-events: none;
}
.block.popping .block-face { transform: scale(1.5); filter: brightness(1.6); }

.block.spawning .block-face { animation: pop-in 220ms cubic-bezier(0.22, 1.4, 0.4, 1) both; }
@keyframes pop-in {
    from { transform: scale(0.2); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.float-score {
    position: absolute;
    pointer-events: none;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--accent-bright);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
    opacity: 0;
    transform: translate(-50%, -50%);
    z-index: 5;
}
.float-score.show { animation: float-up 700ms ease-out forwards; }
@keyframes float-up {
    0% { opacity: 0; transform: translate(-50%, -40%) scale(0.7); }
    20% { opacity: 1; transform: translate(-50%, -55%) scale(1.1); }
    100% { opacity: 0; transform: translate(-50%, -120%) scale(1); }
}

.game-actions { display: flex; justify-content: center; gap: 10px; margin: 18px 0 6px; }
.action-button {
    padding: 10px 20px;
    border-radius: 12px;
    border: 1px solid var(--panel-edge);
    background: var(--panel);
    color: var(--text);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
    transition: transform 120ms ease, background-color 160ms ease;
}
.action-button:hover { background: var(--panel-strong); }
.action-button:active { transform: scale(0.96); }
.action-button.primary { background: var(--accent); color: #06121c; border-color: transparent; }
.action-button.primary:hover { background: var(--accent-bright); }

.cloud-status { text-align: center; color: var(--muted); font-size: 0.76rem; min-height: 1em; margin: 8px 0 0; }

/* Result dialog */
.result-dialog {
    border: none;
    background: transparent;
    padding: 0;
    margin: auto;
    max-width: 92vw;
}
.result-dialog::backdrop { background: rgba(6, 9, 14, 0.66); backdrop-filter: blur(3px); }
.result-card {
    width: min(380px, 92vw);
    padding: 26px 24px;
    border-radius: 22px;
    background: var(--panel-strong);
    border: 1px solid var(--panel-edge);
    box-shadow: 0 24px 60px var(--shadow);
    text-align: center;
    animation: card-in 260ms cubic-bezier(0.22, 1, 0.36, 1) both;
}
@keyframes card-in { from { opacity: 0; transform: translateY(14px) scale(0.96); } to { opacity: 1; transform: none; } }
.result-kicker { margin: 0; font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
#result-title { margin: 4px 0 6px; font-size: 1.6rem; font-weight: 800; }
.result-summary { margin: 0 0 16px; color: var(--muted); font-size: 0.92rem; }
.result-grid { display: flex; justify-content: center; gap: 12px; margin-bottom: 14px; }
.result-grid div { display: flex; flex-direction: column; }
.result-grid strong { font-size: 1.45rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.result-grid span { font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-weight: 650; }
.result-best { margin: 0 0 16px; font-weight: 700; font-size: 0.9rem; min-height: 1.1em; }
.result-best.new-best { color: var(--accent-bright); }
.result-actions { display: flex; justify-content: center; gap: 10px; }

@media (max-width: 480px) {
    body { padding: 16px 10px 84px; }
    .stat { min-width: 80px; padding: 6px 10px; }
}