:root {
    --bg: #2b2c30;
    --panel: #21232a;
    --panel-row: rgba(255, 255, 255, 0.035);
    --bar: #1e2026;
    --accent: #8cd5ed;
    --accent-ink: #10222a;
    --text: #d6d6d6;
    --muted: #8b8f99;
    --line: #34373f;
    --bar-h: clamp(34px, 5.5vh, 50px);
    --radius: 12px;
    --font: 'Outfit', system-ui, -apple-system, Segoe UI, sans-serif;
}

html, body {
    height: 100%;
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    cursor: default;
    /* The chess page is a fixed, single-screen app: never scroll. */
    overflow: hidden;
}

main {
    height: 100%;
}

/* ---- Layout ------------------------------------------------------------ */

/* Portrait / narrow: board on top, panel stacked below. */
#chessContainer {
    height: 100vh;
    height: 100dvh;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, 1.6vh, 16px);
    padding: clamp(10px, 2vh, 20px);
    overflow: hidden;
}

#boardArea {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 0 0 auto;
    width: min(94vw, 56vh);
}

#chessBoard {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}

#gamePanel {
    width: min(94vw, 56vh);
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: var(--panel);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

/* Landscape / wide: board left, game panel right (chess.com style). */
@media (min-aspect-ratio: 1/1) {
    #chessContainer {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: clamp(16px, 3vw, 48px);
        padding: clamp(12px, 3vh, 28px);
    }

    #boardArea {
        width: auto;
        height: 100%;
        justify-content: center;
        flex: 0 0 auto;
    }

    #chessBoard {
        width: min(72vh, 54vw);
        height: min(72vh, 54vw);
    }

    .playerBar {
        width: min(72vh, 54vw);
    }

    #gamePanel {
        width: clamp(300px, 26vw, 380px);
        height: min(86vh, 100%);
        align-self: center;
    }
}

/* ---- Player bars ------------------------------------------------------- */

.playerBar {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    box-sizing: border-box;
    height: var(--bar-h);
    padding: 0 12px;
    background: var(--bar);
    border-radius: 8px;
}

.playerDot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex: 0 0 auto;
}

.playerDot.white {
    background: #ededed;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.4) inset;
}

.playerDot.black {
    background: #2c2c2c;
    box-shadow: 0 0 0 1px #565656 inset;
}

.playerName {
    font-weight: 600;
    white-space: nowrap;
}

.capturedTray {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1px;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.capturedPiece {
    height: clamp(15px, calc(var(--bar-h) * 0.58), 26px);
    width: auto;
    margin-right: -5px;
}

.advantage {
    margin-left: auto;
    font-weight: 700;
    color: var(--accent);
    white-space: nowrap;
}

/* ---- Game panel -------------------------------------------------------- */

.panelHeader {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
    flex: 0 0 auto;
}

.panelLogo {
    font-size: 1.5rem;
    color: var(--accent);
    line-height: 1;
}

.panelHeader h1 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

#moveList {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 6px 0;
}

.movePlaceholder {
    margin: 0;
    padding: 18px 16px;
    color: var(--muted);
    font-size: 0.95rem;
}

.moveRow {
    display: grid;
    grid-template-columns: 2.4em 1fr 1fr;
    align-items: center;
    gap: 6px;
    padding: 4px 14px;
    font-size: 0.98rem;
}

.moveRow:nth-child(odd) {
    background: var(--panel-row);
}

.moveNum {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.moveSan {
    padding: 2px 7px;
    border-radius: 5px;
}

.moveSan.latest {
    background: var(--accent);
    color: var(--accent-ink);
    font-weight: 600;
}

#statusLine {
    flex: 0 0 auto;
    padding: 12px 16px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-weight: 500;
}

#statusLine.alert {
    color: var(--accent);
    font-weight: 700;
}

#panelButtons {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px 16px;
    border-top: 1px solid var(--line);
}

.btn {
    font-family: inherit;
    font-weight: 600;
    font-size: clamp(0.92rem, 1vw, 1.05rem);
    border: 0;
    border-radius: 8px;
    padding: clamp(10px, 1.4vh, 14px) 16px;
    cursor: pointer;
    transition: transform 0.08s ease, filter 0.15s ease, background 0.15s ease;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--accent);
    color: var(--accent-ink);
}

.btn-primary:hover {
    filter: brightness(1.08);
}

.btn-secondary {
    background: #363a44;
    color: var(--text);
}

.btn-secondary:hover {
    background: #424752;
}

.btn-ghost {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--line);
}

.btn-ghost:hover {
    background: #2a2e37;
}

#watchLink {
    color: var(--muted);
    text-decoration: none;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 2px;
}

#watchLink:hover {
    color: var(--accent);
}

/* ---- Mobile chrome (hidden on desktop) --------------------------------- */

.iconBtn {
    background: transparent;
    border: 0;
    color: var(--text);
    font-size: 1.7rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 4px;
}

.iconBtn:hover {
    color: var(--accent);
}

#menuClose {
    margin-left: auto;
}

/* Default (tablet/desktop): no mobile bar, menu button, or sheet chrome. */
#mobileBar,
#menuBackdrop,
#menuClose {
    display: none;
}

/* ---- Phone layout ------------------------------------------------------ */
/* The full panel doesn't fit alongside a usable board on a phone, so we show
   the board + a slim status/menu bar, and tuck the move list and secondary
   actions into a slide-up sheet. The page itself still never scrolls. */
@media (max-width: 640px) {
    #chessContainer {
        flex-direction: column;
        justify-content: flex-start;
        gap: 8px;
        padding: 8px;
    }

    #boardArea {
        width: min(94vw, 60vh);
        flex: 0 0 auto;
    }

    .playerBar {
        width: 100%;
    }

    /* Right rail becomes a hidden bottom sheet, revealed by the Menu button. */
    #gamePanel {
        display: none;
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        top: auto;
        width: 100%;
        height: auto;
        max-height: 85dvh;
        border-radius: 16px 16px 0 0;
        z-index: 60;
        box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.5);
    }

    body.menu-open #gamePanel {
        display: flex;
    }

    /* The slim bar already shows status, so hide the sheet's inline copy. */
    #gamePanel #statusLine {
        display: none;
    }

    #menuClose {
        display: block;
    }

    #menuBackdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.55);
        z-index: 55;
    }

    body.menu-open #menuBackdrop {
        display: block;
    }

    #mobileBar {
        display: flex;
        align-items: center;
        gap: 10px;
        width: min(94vw, 60vh);
        flex: 0 0 auto;
        box-sizing: border-box;
        background: var(--panel);
        border-radius: 10px;
        padding: 8px 10px;
    }

    #mobileStatus {
        flex: 1;
        min-width: 0;
        color: var(--muted);
        font-weight: 600;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    #mobileStatus.alert {
        color: var(--accent);
    }

    #mobileBar #menuToggle {
        flex: 0 0 auto;
        padding: 10px 20px;
    }
}