:root {
    --chess-ink: var(--ink);
    --chess-muted: var(--ink-soft);
    --chess-panel: var(--panel);
    --chess-panel-strong: var(--panel-solid);
    --chess-line: var(--line);
    --chess-green: var(--accent);
    --chess-green-dark: var(--accent);
    --chess-blue: var(--accent-cool);
    --chess-red: var(--accent-strong);
    --chess-gold: var(--accent-warm);
    --chess-light-square: #e7d9bd;
    --chess-dark-square: #6c8a67;
    --chess-focus: var(--accent-warm);
}

.chess-page-shell {
    gap: clamp(0.75rem, 2vw, 1.25rem);
}

.chess-page {
    display: grid;
    gap: clamp(0.75rem, 2vw, 1rem);
}

.chess-hero {
    display: grid;
    gap: 0.25rem;
    padding: clamp(0.75rem, 2.5vw, 1.25rem);
    border-radius: 8px;
    color: var(--chess-ink);
}

.chess-hero h1 {
    max-width: 13ch;
    margin: 0;
    font-size: clamp(1.65rem, 1.45rem + 1vw, 2.35rem);
    line-height: 1;
    letter-spacing: 0;
}

.chess-hero .eyebrow,
.chess-hero .lede {
    margin: 0;
}

.chess-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(17rem, 22rem);
    gap: clamp(1rem, 3vw, 1.5rem);
    align-items: start;
}

.chess-stack {
    display: grid;
    gap: clamp(1rem, 3vw, 1.5rem);
}

.chess-panel {
    min-width: 0;
    border-radius: 8px;
    color: var(--chess-ink);
    display: grid;
    gap: 1rem;
    padding: clamp(1rem, 3vw, 1.35rem);
}

.chess-board-panel {
    min-width: 0;
    border-radius: 8px;
    color: var(--chess-ink);
    padding: clamp(0.75rem, 2.5vw, 1rem);
}

.chess-move-panel {
    min-width: 0;
    border-radius: 8px;
    color: var(--chess-ink);
    padding: clamp(0.75rem, 2.5vw, 1rem);
}

.chess-section-heading {
    display: grid;
    gap: 0.25rem;
}

.chess-section-heading h2,
.chess-game-card h3 {
    margin: 0;
    color: var(--chess-ink);
    line-height: 1.1;
    letter-spacing: 0;
}

.chess-form {
    display: grid;
    gap: 0.8rem;
}

.chess-copy-box {
    display: grid;
    gap: 0.8rem;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: end;
    padding-top: 0.25rem;
}

.chess-new-game-form {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
}

.chess-field {
    display: grid;
    gap: 0.35rem;
    color: var(--chess-muted);
    font-size: 0.92rem;
    font-weight: 700;
}

.chess-field input,
.chess-field select {
    box-sizing: border-box;
    width: 100%;
    min-height: 2.75rem;
    border: 1px solid var(--chess-line);
    border-radius: 8px;
    background: rgba(8, 14, 27, 0.72);
    color: var(--chess-ink);
    font: inherit;
    font-weight: 600;
    padding: 0.65rem 0.75rem;
}

.chess-field input:focus-visible,
.chess-field select:focus-visible,
.chess-button:focus-visible,
.chess-text-link:focus-visible,
.chess-game-card a:focus-visible {
    outline: 3px solid var(--chess-focus);
    outline-offset: 3px;
}

.chess-button {
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    width: fit-content;
    max-width: 100%;
    border: 1px solid rgba(33, 79, 56, 0.32);
    border-radius: 8px;
    background: var(--chess-panel-strong);
    color: var(--chess-green-dark);
    cursor: pointer;
    font: inherit;
    font-weight: 800;
    line-height: 1.1;
    padding: 0.7rem 1rem;
    text-decoration: none;
    transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.chess-button:hover {
    border-color: rgba(33, 79, 56, 0.52);
    transform: translateY(-1px);
}

.chess-button:disabled {
    cursor: not-allowed;
    opacity: 0.62;
    transform: none;
}

[aria-busy="true"] .chess-button:disabled,
.chess-button[aria-busy="true"]:disabled {
    cursor: wait;
}

.chess-button-primary {
    background: var(--chess-green);
    border-color: var(--chess-green);
    color: var(--paper);
}

.chess-button-small {
    min-height: 2.35rem;
    padding: 0.55rem 0.75rem;
}

.chess-text-link {
    color: var(--chess-blue);
    font-weight: 800;
    text-decoration-thickness: 0.12em;
    text-underline-offset: 0.18em;
}

.chess-copy-box .chess-text-link {
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    max-width: 100%;
    overflow-wrap: anywhere;
    text-align: center;
}

#chess-join-url {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.88rem;
}

.chess-message {
    min-height: 1.4em;
    margin: 0;
    color: var(--chess-muted);
    font-weight: 700;
    overflow-wrap: anywhere;
}

.chess-alert {
    min-height: 1.4em;
    margin: 0;
    color: var(--chess-red);
    font-weight: 700;
    overflow-wrap: anywhere;
}

.chess-message[data-tone="success"] {
    color: var(--chess-green-dark);
}

.chess-message[data-tone="error"],
.chess-alert[data-tone="error"] {
    color: var(--chess-red);
}

.chess-alert[data-tone="neutral"] {
    color: var(--chess-muted);
}

.chess-alert[data-tone="success"] {
    color: var(--chess-green-dark);
}

.chess-games-list {
    display: grid;
    gap: 0.75rem;
}

.chess-state-message {
    box-sizing: border-box;
    width: 100%;
    margin: 0;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--chess-line);
    border-radius: 8px;
    background: rgba(8, 14, 27, 0.42);
    color: var(--chess-muted);
    font-weight: 700;
}

.chess-state-message-loading {
    color: var(--chess-ink);
}

.chess-state-message-error {
    border-color: rgba(196, 72, 72, 0.45);
    color: var(--chess-red);
}

.chess-game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
    gap: 0.9rem;
}

.chess-game-card {
    display: grid;
    gap: 0.8rem;
    min-width: 0;
    padding: 1rem;
    border: 1px solid var(--chess-line);
    border-radius: 8px;
    background: rgba(8, 14, 27, 0.56);
}

.chess-kicker {
    color: var(--chess-green-dark);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0;
    text-transform: uppercase;
}

.chess-game-meta {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 0.35rem 0.7rem;
    margin: 0;
    color: var(--chess-muted);
}

.chess-game-meta dt {
    font-weight: 800;
}

.chess-game-meta dd {
    margin: 0;
    color: var(--chess-ink);
    font-weight: 700;
}

.chess-identity-current {
    margin: 0;
    color: var(--chess-muted);
}

.chess-identity-current strong {
    color: var(--chess-ink);
}

.chess-sidebar {
    align-content: start;
}

.chess-leaderboard-panel {
    gap: 0.9rem;
}

.chess-king-card,
.chess-leaderboard-row {
    border: 1px solid var(--chess-line);
    border-radius: 8px;
    background: rgba(8, 14, 27, 0.56);
}

.chess-king-card {
    display: grid;
    gap: 0.7rem;
    padding: 1rem;
}

.chess-king-card .chess-state-message,
.chess-leaderboard-list .chess-state-message {
    margin: 0;
}

.chess-king-label {
    color: var(--chess-gold);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0;
    text-transform: uppercase;
}

.chess-king-name,
.chess-leaderboard-name {
    margin: 0;
    color: var(--chess-ink);
    font-weight: 800;
}

.chess-king-name {
    font-size: 1.25rem;
    line-height: 1.1;
}

.chess-king-meta,
.chess-leaderboard-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.chess-king-meta {
    margin: 0;
}

.chess-leaderboard-list {
    display: grid;
    gap: 0.7rem;
}

.chess-leaderboard-row {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.75rem;
    align-items: start;
    padding: 0.85rem 0.9rem;
}

.chess-leaderboard-rank {
    display: grid;
    place-items: center;
    min-width: 2.4rem;
    min-height: 2.4rem;
    border-radius: 999px;
    background: rgba(196, 164, 96, 0.16);
    color: var(--chess-gold);
    font-weight: 900;
}

.chess-leaderboard-body {
    display: grid;
    gap: 0.4rem;
    min-width: 0;
}

.chess-leaderboard-header {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 0.7rem;
    align-items: baseline;
}

.chess-leaderboard-stats {
    color: var(--chess-muted);
    font-size: 0.88rem;
    font-weight: 700;
}

.chess-leaderboard-note {
    color: var(--chess-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.chess-board-shell {
    display: grid;
    grid-template-columns: minmax(18rem, 34rem) minmax(16rem, 1fr);
    gap: clamp(1rem, 3vw, 1.5rem);
    align-items: start;
}

.chess-board-frame {
    display: grid;
    gap: 0.75rem;
    width: min(100%, 34rem);
}

.chess-board {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    aspect-ratio: 1;
    overflow: hidden;
    border: 2px solid rgba(23, 32, 26, 0.32);
    border-radius: 8px;
    background:
        linear-gradient(rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.08)),
        url('/assets/chess/board-texture.png') center / cover,
        var(--chess-dark-square);
}

.chess-square {
    position: relative;
    display: grid;
    place-items: center;
    min-width: 0;
    aspect-ratio: 1;
    border: 0;
    color: var(--chess-ink);
    cursor: pointer;
    font: inherit;
    padding: 0;
}

.chess-square:disabled {
    cursor: default;
}

.chess-square:focus-visible {
    outline: 3px solid var(--chess-focus);
    outline-offset: -3px;
    z-index: 1;
}

.chess-square-light {
    background: rgba(231, 217, 189, 0.82);
}

.chess-square-dark {
    background: rgba(108, 138, 103, 0.84);
}

.chess-square-selected {
    box-shadow: inset 0 0 0 4px var(--chess-gold);
}

.chess-square-target {
    box-shadow: inset 0 0 0 4px rgba(49, 95, 131, 0.58);
}

.chess-square-target::after {
    content: '';
    position: absolute;
    width: 28%;
    aspect-ratio: 1;
    border-radius: 50%;
    background: rgba(49, 95, 131, 0.48);
}

.chess-piece {
    display: grid;
    place-items: center;
    width: 82%;
    aspect-ratio: 1;
    color: inherit;
    font-size: 2.25rem;
    line-height: 1;
    object-fit: contain;
    filter: drop-shadow(0 0.25rem 0.18rem rgba(16, 24, 32, 0.28));
    pointer-events: none;
    user-select: none;
}

.chess-status-row,
.chess-board-actions,
.chess-promotion-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
}

.chess-fullscreen-toggle,
.chess-board-actions {
    display: none;
}

.chess-game-status-bar {
    gap: 0.45rem;
}

.chess-game-status-bar .chess-alert {
    flex: 1 1 14rem;
    min-height: 0;
    padding: 0.2rem 0;
}

.chess-status-pill {
    display: inline-flex;
    align-items: center;
    min-width: 0;
    min-height: 1.8rem;
    border: 1px solid var(--chess-line);
    border-radius: 999px;
    background: rgba(8, 14, 27, 0.64);
    color: var(--chess-muted);
    font-size: 0.82rem;
    font-weight: 800;
    line-height: 1.15;
    padding: 0.28rem 0.6rem;
    overflow-wrap: anywhere;
}

.chess-move-list {
    display: grid;
    gap: 0.35rem;
    max-height: 24rem;
    overflow: auto;
    padding-right: 0.25rem;
    scrollbar-gutter: stable;
}

.chess-move-list .chess-state-message {
    margin-right: 0.25rem;
}

.chess-move-row {
    display: grid;
    grid-template-columns: 3rem minmax(0, 1fr);
    gap: 0.5rem;
    padding: 0.45rem 0;
    border-bottom: 1px solid var(--chess-line);
}

.chess-game-page[data-loading="true"] .chess-board {
    cursor: progress;
}

.chess-game-page[data-state="error"] .chess-board-shell {
    opacity: 0.52;
    pointer-events: none;
}

.chess-game-hero h1 {
    max-width: 9ch;
}

.chess-board-help {
    margin: 0;
    color: var(--chess-muted);
    font-size: 0.92rem;
    font-weight: 700;
}

.chess-game-detail-section {
    display: grid;
    gap: 0.85rem;
}

.chess-game-detail-section + .chess-game-detail-section {
    margin-top: 1.35rem;
    padding-top: 1.35rem;
    border-top: 1px solid var(--chess-line);
}

.chess-notification-control > span:last-child {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--chess-ink);
    font-weight: 700;
}

.chess-notification-control input {
    flex: 0 0 auto;
    width: 1.1rem;
    height: 1.1rem;
}

.chess-player-meta dd {
    min-width: 0;
    overflow-wrap: anywhere;
}

.chess-move-row span {
    min-width: 0;
    overflow-wrap: anywhere;
}

.chess-promotion-dialog {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgba(16, 24, 32, 0.42);
}

.chess-promotion-dialog[hidden] {
    display: none;
}

.chess-promotion-card {
    display: grid;
    gap: 1rem;
    width: min(100%, 22rem);
    padding: clamp(1rem, 4vw, 1.25rem);
    border: 1px solid var(--chess-line);
    border-radius: 8px;
    background: var(--chess-panel-strong);
    color: var(--chess-ink);
    box-shadow: 0 24px 60px -32px rgba(16, 24, 32, 0.65);
}

@media (max-width: 760px) {
    .chess-layout,
    .chess-board-shell,
    .chess-new-game-form,
    .chess-copy-box {
        grid-template-columns: 1fr;
    }

    .chess-button,
    .chess-copy-box .chess-text-link {
        width: 100%;
    }

    .chess-hero h1 {
        max-width: 11ch;
    }

    .chess-board-shell {
        gap: 0.75rem;
    }

    .chess-board-panel,
    .chess-move-panel {
        padding: 0.75rem;
    }

    .chess-board-frame {
        width: 100%;
        gap: 0.6rem;
    }

    .chess-fullscreen-toggle {
        display: inline-flex;
    }

    .chess-game-status-bar .chess-button {
        flex: 1 1 8rem;
        width: auto;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-board-frame {
        position: fixed;
        inset: 0;
        z-index: 10;
        box-sizing: border-box;
        grid-template-rows: auto minmax(0, 1fr) auto auto;
        align-content: stretch;
        min-height: 100vh;
        height: 100vh;
        height: 100dvh;
        padding: 0.6rem;
        background: var(--chess-panel);
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-fullscreen-toggle,
    .chess-game-page[data-board-fullscreen="true"] .chess-board-help {
        display: none;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-game-status-bar {
        align-self: start;
        max-height: 6.75rem;
        overflow: auto;
        padding-bottom: 0.15rem;
        scrollbar-gutter: stable;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-game-status-bar .chess-alert {
        flex-basis: 100%;
        padding: 0;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-status-pill,
    .chess-game-page[data-board-fullscreen="true"] .chess-game-status-bar .chess-button {
        flex: 1 1 7.25rem;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-board {
        align-self: center;
        justify-self: center;
        width: min(calc(100vh - 12rem), calc(100vw - 1.2rem));
        width: min(calc(100dvh - 12rem), calc(100vw - 1.2rem));
        height: min(calc(100vh - 12rem), calc(100vw - 1.2rem));
        height: min(calc(100dvh - 12rem), calc(100vw - 1.2rem));
    }

    .chess-game-page[data-board-fullscreen="true"] #chess-board-message {
        position: fixed;
        right: 0.75rem;
        bottom: 4.35rem;
        left: 0.75rem;
        z-index: 11;
        box-sizing: border-box;
        min-height: 0;
        padding: 0.55rem 0.75rem;
        border: 1px solid var(--chess-line);
        border-radius: 8px;
        background: var(--chess-panel-strong);
        text-align: center;
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-board-actions {
        position: fixed;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 11;
        display: flex;
        justify-content: center;
        box-sizing: border-box;
        padding: 0.75rem;
        background: var(--chess-panel-strong);
        border-top: 1px solid var(--chess-line);
    }

    .chess-game-page[data-board-fullscreen="true"] .chess-board-actions .chess-button {
        width: min(100%, 18rem);
    }

    .chess-game-status-bar {
        gap: 0.4rem;
    }

    .chess-game-status-bar .chess-alert {
        text-align: center;
    }

    .chess-status-pill {
        flex: 1 1 9rem;
        justify-content: center;
    }

    .chess-promotion-options .chess-button {
        flex: 1 1 8rem;
    }
}