:root {
    --bg: #1a1d23;
    --panel: #242830;
    --panel-border: #343a46;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --accent: #4c8bf5;
    --accent-hover: #3b78e7;
    --danger: #e57373;
    --success: #81c784;
    --light-square: #c8c0b4;
    --dark-square: #4a4e56;
    --light-square-img: url("/images/board/light_tile.png");
    --dark-square-img: url("/images/board/dark_tile.png");
    --selected: rgba(var(--accent-rgb), 0.55);
    --legal: rgba(0, 0, 0, 0.18);
    --last-move: rgba(255, 255, 0, 0.35);
    --check: rgba(var(--danger-rgb), 0.65);
    --nav: #12151a;

    /* Leaderboard podium (PRD §9): gold / silver / bronze, plus their RGB triples
       so tints and borders can be derived per theme. */
    --lb-gold: #f2c14e;
    --lb-silver: #cbd2dc;
    --lb-bronze: #cd7f32;
    --lb-gold-rgb: 242, 193, 78;
    --lb-silver-rgb: 203, 210, 220;
    --lb-bronze-rgb: 205, 127, 50;

    /* Board coordinate labels — each sits in its own opaque chip so the text
       stays legible over any tile art regardless of that tile's colour. */
    --coord-chip-bg: var(--board-frame);
    --coord-chip-text: var(--text);

    /* ---- Derived tokens, recomputed per theme -------------------------------
       Themes override the color tokens above; these intermediate values pick up
       the change automatically so no other rule needs edited per theme. */
    --accent-rgb: 76, 139, 245;
    --danger-rgb: 229, 115, 115;
    --overlay-rgb: 18, 21, 26;
    --block-border: rgba(52, 58, 70, 0.85);
    --selected-edge: rgba(120, 180, 255, 0.35);
    --input-bg: #1b1f27;
    --auth-bg: rgba(36, 40, 48, 0.92);
    --panel-scene-bg: rgba(36, 40, 48, 0.88);
    --toast-bg: #2a303a;
    --banner-bg: #2b3340;
    --board-frame: #0f1115;
    --link-hover: #7aa7f7;
    --guest-badge-text: #b8d0ff;
    --photo-frame-a: #3a4050;
    --photo-frame-b: #1e222a;
    --board-chrome: 14rem;
    --board-piece-scale: 92%;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
}

* { box-sizing: border-box; }

/* Bootstrap's light-theme muted text (dark gray) is unreadable on the dark UI. */
.text-muted {
    color: var(--muted) !important;
}

html {
    margin: 0;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100%;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    padding-left: var(--safe-left);
    padding-right: var(--safe-right);
}

/* Full-page home splash / auth background */
.home-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-color: var(--bg);
    background-image: url("/images/Chassaka_Home.png");
    background-repeat: no-repeat;
    background-position: center center;
    /* Cover viewport while keeping aspect ratio (may crop edges) */
    background-size: cover;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.home-bg.visible {
    opacity: 1;
    visibility: visible;
}

/* Full-page lobby scene */
.lobby-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-color: var(--bg);
    background-image: url("/images/Chassaka_Lobby.png");
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.lobby-bg.visible {
    opacity: 1;
    visibility: visible;
}

/* Full-page games list scene */
.games-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-color: var(--bg);
    background-image: url("/images/Chassaka_GamesRoom.png");
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.games-bg.visible {
    opacity: 1;
    visibility: visible;
}

/* Full-page in-game scene (stone platform under board) */
.game-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-color: var(--bg);
    background-image: url("/images/Chassaka_InGame.png");
    background-repeat: no-repeat;
    /* Bias slightly toward bottom so the stone platform sits under the board */
    background-position: center 35%;
    background-size: cover;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.game-bg.visible {
    opacity: 1;
    visibility: visible;
}

#app {
    position: relative;
    z-index: 1;
}

/* Site-wide build version badge (top-left) */
.app-version {
    position: fixed;
    bottom: calc(0.35rem + var(--safe-bottom));
    left: calc(0.5rem + var(--safe-left));
    top: auto;
    z-index: 9999;
    margin: 0;
    padding: 0.15rem 0.4rem;
    font-size: 0.65rem;
    line-height: 1.2;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    color: var(--muted);
    background: rgba(var(--overlay-rgb), 0.72);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    pointer-events: none;
    user-select: none;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

/* ---- Global sound & music controls (PRD-Global-Sound-Music-Controls) ---- */
/* Fixed to the viewport at the bottom-left, above every normal UI element and
   effect (chessboard, castle, fireworks, victory animations, modals, toasts). */
.audio-controls {
    position: fixed;
    left: calc(1rem + var(--safe-left));
    /* Stacked above the build-version badge which occupies the same corner */
    bottom: calc(2rem + var(--safe-bottom));
    z-index: 9999;
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.audio-control-btn {
    position: relative; /* anchor for the OFF-state slash overlay */
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: rgba(var(--overlay-rgb), 0.85);
    border: 2px solid var(--panel-border);
    border-radius: 0;
    color: var(--text);
    cursor: pointer;
    box-shadow: 0 3px 0 rgba(0, 0, 0, 0.5);
    transition: transform 0.12s ease, box-shadow 0.12s ease,
        color 0.12s ease, border-color 0.12s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.audio-control-btn:hover {
    border-color: var(--accent);
}

.audio-control-btn:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}

.audio-control-btn:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* Muted state: faded icon with a red pixel slash */
.audio-control-btn.off {
    color: var(--muted);
}

/* Toggle icon image (PNG pixel art, rendered crisp) */
.audio-icon {
    display: block;
    height: 27px;
    width: auto;
    image-rendering: pixelated;
    pointer-events: none;
    user-select: none;
}

.audio-control-btn.off .audio-icon {
    opacity: 0.45;
}

/* Red pixel slash overlaid on the icon, visible only in the OFF state */
.audio-icon-slash {
    position: absolute;
    top: 3px;
    right: 3px;
    bottom: 3px;
    left: 3px;
    display: none;
    shape-rendering: crispEdges;
    fill: var(--danger);
    pointer-events: none;
}

.audio-control-btn.off .audio-icon-slash {
    display: block;
}

/* Phones and compact tablets: smaller buttons, still comfortable touch targets */
@media (max-width: 768px) {
    .audio-controls {
        left: calc(0.75rem + var(--safe-left));
        bottom: calc(1.75rem + var(--safe-bottom));
        gap: 0.4rem;
    }

    .audio-control-btn {
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 400px) {
    .audio-control-btn {
        width: 36px;
        height: 36px;
    }
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

.view { display: none; min-height: 100vh; min-height: 100dvh; }
.view.active { display: block; }

/* Auth screens sit over the home image */
#loading-screen,
#view-login,
#view-register {
    background: transparent;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.04em;
    text-align: center;
    margin-bottom: 1.5rem;
}

.brand-sm { font-weight: 700; letter-spacing: 0.03em; }

.auth-card {
    width: min(420px, calc(100vw - 2rem));
    margin: 10vh auto;
    background: var(--auth-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 12px 40px rgba(0,0,0,0.35);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Hidden during splash; fades in after hold */
.auth-card--splash {
    opacity: 0;
    pointer-events: none;
}

#view-login .auth-card,
#view-register .auth-card {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 1.1s ease, transform 1.1s ease;
    pointer-events: none;
}

#view-login.auth-ready .auth-card,
#view-register.auth-ready .auth-card {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.form-control, .form-control:focus {
    background: var(--input-bg);
    border-color: var(--panel-border);
    color: var(--text);
}

.form-control:focus {
    box-shadow: 0 0 0 0.2rem rgba(var(--accent-rgb), 0.25);
}

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

.auth-divider {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.25rem 0 1rem;
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--panel-border);
}
.btn-guest {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--text);
    font-weight: 600;
}
.btn-guest:hover,
.btn-guest:focus {
    background: rgba(var(--accent-rgb), 0.15);
    border-color: var(--accent-hover);
    color: var(--text);
}
.btn-guest:disabled {
    opacity: 0.65;
}
.guest-hint {
    line-height: 1.35;
}
.guest-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
    background: rgba(var(--accent-rgb), 0.2);
    border: 1px solid rgba(var(--accent-rgb), 0.55);
    color: var(--guest-badge-text);
    line-height: 1.2;
    vertical-align: middle;
}

.guest-history-gate {
    margin: 0.5rem 0 0.75rem;
    padding: 0.85rem 1rem;
    border-radius: 8px;
    border: 1px dashed rgba(var(--accent-rgb), 0.45);
    background: rgba(var(--accent-rgb), 0.08);
}

.app-nav {
    background: var(--nav) !important;
    border-bottom: 1px solid var(--panel-border);
    padding-top: var(--safe-top);
}

.app-nav .container-fluid {
    flex-wrap: wrap;
    gap: 0.5rem;
    max-width: 100%;
}

.app-main {
    padding: 1rem;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding-bottom: calc(1rem + var(--safe-bottom));
}

.panel-card {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    min-width: 0;
    max-width: 100%;
}

.lobby-grid {
    display: grid;
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: 1rem;
    min-height: calc(100vh - 100px);
    min-height: calc(100dvh - 100px);
    width: 100%;
    max-width: 100%;
}

.online-panel h2, .chat-panel h2, .panel-card h2, .panel-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.75rem;
}

.user-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.user-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.55rem 0.4rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    flex-wrap: wrap;
    min-width: 0;
}

.user-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}

.dot-online {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    display: inline-block;
    flex-shrink: 0;
}

.user-actions {
    display: flex;
    gap: 0.35rem;
    flex-shrink: 0;
}

.user-actions .btn {
    --bs-btn-padding-y: 0.15rem;
    --bs-btn-padding-x: 0.45rem;
    --bs-btn-font-size: 0.75rem;
}

.chat-panel {
    display: flex;
    flex-direction: column;
    min-height: 420px;
    min-width: 0;
}

.chat-log {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--input-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.75rem;
    min-height: 240px;
    max-height: 55vh;
    min-width: 0;
}

.chat-item { margin-bottom: 0.65rem; }
.chat-item .meta {
    font-size: 0.78rem;
    color: var(--muted);
}
.chat-item .body {
    white-space: pre-wrap;
    word-break: break-word;
}

.chat-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    min-width: 0;
}

.chat-form .form-control {
    min-width: 0;
    flex: 1 1 auto;
}

.chat-form .btn {
    flex-shrink: 0;
}

.game-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    gap: 1rem;
    align-items: start;
    width: 100%;
    max-width: 100%;
}

.board-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-width: 0;
    max-width: 100%;
    width: 100%;
}

/* Centers the board over the in-game scene platform */
.board-stage {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-width: 0;
    z-index: 1;
}

.board-stage .chessboard {
    position: relative;
    z-index: 1;
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.35),
        0 18px 40px rgba(0, 0, 0, 0.45);
}

/* Let the fantasy scene show through the app shell during a match */
#view-app.game-scene-active,
#view-app.game-scene-active .app-main {
    background: transparent;
}

#view-app.game-scene-active .player-bar {
    background: rgba(var(--overlay-rgb), 0.62);
    border: 1px solid var(--block-border);
    border-radius: 8px;
    padding: 0.45rem 0.75rem;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

#view-app.game-scene-active .game-actions {
    background: rgba(var(--overlay-rgb), 0.55);
    border-radius: 8px;
    padding: 0.5rem;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

#view-app.game-scene-active .panel-card {
    background: var(--panel-scene-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Let the lobby scene show through the app shell */
#view-app.lobby-scene-active,
#view-app.lobby-scene-active .app-main {
    background: transparent;
}

#view-app.lobby-scene-active .panel-card {
    background: var(--panel-scene-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Let the games room scene show through the app shell */
#view-app.games-scene-active,
#view-app.games-scene-active .app-main {
    background: transparent;
}

#view-app.games-scene-active .panel-card {
    background: var(--panel-scene-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.side-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
    max-width: 100%;
}

.player-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.35rem 0.25rem;
    min-width: 0;
    flex-wrap: wrap;
}

.player-bar > div {
    min-width: 0;
}

.captured {
    min-height: 1.4rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.15rem 0.2rem;
    color: var(--muted);
    overflow-wrap: anywhere;
}

.captured-piece {
    display: block;
    width: clamp(18px, 4vw, 30px);
    height: clamp(18px, 4vw, 30px);
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
}

.turn-indicator {
    font-weight: 600;
    color: var(--accent);
}

/*
 * Board fits the smaller of column width, 640px max, and remaining viewport height.
 */
.chessboard {
    --board-size: min(
        100%,
        640px,
        calc(100dvh - var(--board-chrome) - var(--safe-top) - var(--safe-bottom)),
        calc(100vh - var(--board-chrome) - var(--safe-top) - var(--safe-bottom))
    );
    width: var(--board-size);
    max-width: 100%;
    aspect-ratio: 1 / 1;
    height: auto;
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    grid-template-rows: repeat(8, minmax(0, 1fr));
    border: 3px solid var(--board-frame);
    border-radius: 4px;
    overflow: hidden;
    user-select: none;
    margin: 0 auto;
    container-type: size;
    container-name: board;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

.square {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    outline: none;
    min-width: 0;
    min-height: 0;
    padding: 0;
    border: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
}

.square.light {
    background-color: var(--light-square);
    background-image: var(--light-square-img);
    color: #222;
}

.square.dark {
    background-color: var(--dark-square);
    background-image: var(--dark-square-img);
    color: #eee;
}

.square.selected { box-shadow: inset 0 0 0 4px var(--selected); }
/* Static legal-move dots replaced by ChessEffectsManager animated markers (see chess-effects.css).
   Keep .legal / .capture class hooks for capture pulse + future phases. */
.square.legal::after {
    content: none;
    display: none;
}
.square.legal.capture::after {
    content: none;
    display: none;
}

/* Layer highlight over tile art (do not replace background-image) */
.square.light.last-move {
    background-image: linear-gradient(var(--last-move), var(--last-move)), var(--light-square-img);
}
.square.dark.last-move {
    background-image: linear-gradient(var(--last-move), var(--last-move)), var(--dark-square-img);
}
.square.light.in-check {
    background-image: linear-gradient(var(--check), var(--check)), var(--light-square-img);
}
.square.dark.in-check {
    background-image: linear-gradient(var(--check), var(--check)), var(--dark-square-img);
}
.square.light.last-move.in-check {
    background-image:
        linear-gradient(var(--check), var(--check)),
        linear-gradient(var(--last-move), var(--last-move)),
        var(--light-square-img);
}
.square.dark.last-move.in-check {
    background-image:
        linear-gradient(var(--check), var(--check)),
        linear-gradient(var(--last-move), var(--last-move)),
        var(--dark-square-img);
}
.square:focus-visible { box-shadow: inset 0 0 0 3px #fff; }

.coord {
    position: absolute;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1px 3px;
    font-size: max(0.7rem, 1cqmin, 12%);
    font-weight: 800;
    line-height: 1;
    font-variant-numeric: tabular-nums;
    color: var(--coord-chip-text);
    background-color: var(--coord-chip-bg);
    border-radius: 2px;
    opacity: 1;
    pointer-events: none;
    z-index: 3;
}
.coord-file { right: 3px; bottom: 1px; }
.coord-rank { left: 3px; top: 1px; }

/* Piece sits inside square; board size owns layout — PNG never drives square size */
.piece-container {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    /* visible so selection lift / check FX are not clipped */
    overflow: visible;
    pointer-events: none;
    z-index: 1;
}


.chess-piece {
    display: block;
    width: var(--piece-scale, var(--board-piece-scale));
    height: var(--piece-scale, var(--board-piece-scale));
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
}

.chess-piece-fallback {
    font-size: clamp(1.05rem, 11cqi, 3.2rem);
    line-height: 1;
    pointer-events: none;
}

.promo-btn {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.75rem;
    text-align: left;
}

.promotion-piece {
    display: block;
    width: clamp(44px, 12vw, 72px);
    height: clamp(44px, 12vw, 72px);
    flex-shrink: 0;
    object-fit: contain;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
}

.promo-label {
    font-weight: 600;
}

.game-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.game-actions .btn {
    flex: 0 1 auto;
}

.game-banner {
    background: var(--banner-bg);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-weight: 600;
    word-break: break-word;
}

.move-history {
    max-height: 220px;
    overflow-y: auto;
    overflow-x: hidden;
    margin: 0;
    /* Native outside-positioned <ol> markers sit left of the content box and are
       clipped by overflow-x: hidden above; reserve room for 3-digit move numbers. */
    padding-left: 2.5rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.92rem;
}

.games-list .game-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    flex-wrap: wrap;
    min-width: 0;
}

.section-title {
    font-size: 0.95rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.dark-modal {
    background: var(--panel);
    color: var(--text);
    border: 1px solid var(--panel-border);
}

.dark-modal .modal-header,
.dark-modal .modal-footer {
    border-color: var(--panel-border);
}

.feedback-textarea {
    min-height: 8rem;
    resize: vertical;
    background: rgba(0, 0, 0, 0.25);
    color: var(--text);
    border-color: var(--panel-border);
}

.feedback-textarea:focus {
    background: rgba(0, 0, 0, 0.35);
    color: var(--text);
    border-color: var(--accent);
    box-shadow: 0 0 0 0.2rem rgba(var(--accent-rgb), 0.2);
}

.feedback-textarea::placeholder {
    color: var(--muted);
}

@media (max-width: 576px) {
    #feedback-modal .modal-dialog {
        margin: 0.75rem auto;
        max-width: 90%;
    }
}

/* About dialog */
.about-modal-body {
    max-height: min(70vh, 32rem);
}

.about-header {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    margin-bottom: 1.25rem;
}

.about-author-photo-frame {
    flex: 0 0 auto;
    width: 64px;
    padding: 3px;
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    background: linear-gradient(145deg, var(--photo-frame-a) 0%, var(--photo-frame-b) 100%);
    box-shadow:
        0 0 0 1px rgba(0, 0, 0, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.08),
        0 4px 10px rgba(0, 0, 0, 0.35);
}

.about-author-photo {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 3px;
    vertical-align: middle;
}

.about-blurb {
    flex: 1 1 auto;
    min-width: 0;
    margin-bottom: 0;
    color: var(--text);
    line-height: 1.5;
}

.about-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.about-versions-table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text);
    --bs-table-border-color: var(--panel-border);
    --bs-table-striped-bg: rgba(255, 255, 255, 0.03);
    --bs-table-hover-bg: rgba(255, 255, 255, 0.05);
    margin-bottom: 0;
    font-size: 0.875rem;
}

.about-versions-table thead th {
    color: var(--muted);
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom-width: 1px;
}

.about-versions-table th[scope="row"] {
    font-weight: 500;
    color: var(--muted);
    white-space: nowrap;
    width: 42%;
    vertical-align: middle;
}

.about-versions-table td {
    vertical-align: middle;
    color: var(--text);
}

.about-versions-table .font-monospace {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
}

.toast-container .toast {
    background: var(--toast-bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
}

@media (max-width: 1200px) {
    .game-layout {
        grid-template-columns: minmax(0, 1fr) minmax(0, 280px);
    }
}

/*
 * iPad portrait + smaller landscape: stack so the full board is never clipped.
 * 1100px covers typical iPad landscape CSS widths better than 992px alone.
 */
@media (max-width: 1100px) {
    .lobby-grid,
    .game-layout {
        grid-template-columns: 1fr;
    }

    .board-column {
        align-items: stretch;
    }

    .side-column {
        width: 100%;
    }

    .chat-log {
        max-height: 40vh;
    }

    .chat-panel {
        min-height: 280px;
    }
}

/* Phones and compact tablets */
@media (max-width: 768px) {
    .app-main {
        padding: 0.75rem;
    }

    .panel-card {
        padding: 0.85rem 1rem;
    }

    .auth-card {
        margin: 6vh auto;
        padding: 1.5rem;
    }

    .lobby-grid {
        min-height: 0;
    }

    .chat-panel {
        min-height: 260px;
    }

    .chat-log {
        min-height: 160px;
        max-height: 35vh;
    }

    .player-bar {
        gap: 0.5rem;
        padding: 0.25rem 0;
    }

    .game-actions .btn {
        flex: 1 1 auto;
        min-width: calc(50% - 0.5rem);
    }

    .move-history {
        max-height: 160px;
        font-size: 0.85rem;
    }

    :root {
        --board-chrome: 12.5rem;
    }
}

/* Very small phones */
@media (max-width: 400px) {
    .app-main {
        padding: 0.5rem;
    }

    .app-nav .navbar-brand {
        font-size: 1rem;
    }

    .game-actions .btn {
        min-width: 100%;
    }

    :root {
        --board-chrome: 13.5rem;
    }
}

/* Short landscape (iPad landscape, split-screen) */
@media (max-height: 700px) and (orientation: landscape) {
    :root {
        --board-chrome: 10.5rem;
    }

    .game-layout {
        grid-template-columns: minmax(0, 1fr) minmax(0, 240px);
        gap: 0.75rem;
    }

    .chat-panel {
        min-height: 180px;
    }

    .chat-log {
        min-height: 100px;
        max-height: 28vh;
    }

    .move-history {
        max-height: 120px;
    }

    .player-bar {
        padding: 0.15rem 0;
    }
}

/* Short + not wide enough: force stack with a taller board */
@media (max-height: 700px) and (max-width: 1100px) {
    .game-layout {
        grid-template-columns: 1fr;
    }

    .chessboard {
        --board-size: min(
            100%,
            calc(100dvh - 9.5rem - var(--safe-top) - var(--safe-bottom)),
            calc(100vh - 9.5rem - var(--safe-top) - var(--safe-bottom))
        );
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        scroll-behavior: auto !important;
    }

    .audio-control-btn {
        transition: none;
    }

    .home-bg,
    .lobby-bg,
    .games-bg,
    .game-bg {
        transition: none;
    }

    #view-login .auth-card,
    #view-register .auth-card {
        transition: none;
        transform: none;
    }
}



/* Play vs Computer */
.computer-play-bar h2 {
    font-size: 1.1rem;
}
.computer-difficulty-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.computer-diff-option {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 0.5rem;
    align-items: center;
    width: 100%;
    text-align: left;
    padding: 0.75rem 1rem;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    color: var(--text);
    cursor: pointer;
}
.computer-diff-option:hover {
    border-color: var(--accent);
}
.computer-diff-option.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
    background: rgba(var(--accent-rgb), 0.12);
}
.computer-diff-option .diff-label {
    font-weight: 600;
}
.computer-diff-option .diff-name {
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.computer-diff-option .diff-strength {
    color: var(--accent);
    font-size: 0.85rem;
}

/* ============================================================================
   Leaderboard (PRD §5–§13, §23, §24, §31)
   ============================================================================ */
/* Panel reads as the 8-bit "hall of banners": faint checkerboard study over the
   theme panel colour, gold inset seam and a hard pixel drop shadow. */
.leaderboard-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background-color: var(--panel);
    background-image:
        linear-gradient(45deg, rgba(255, 255, 255, 0.03) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.03) 75%),
        linear-gradient(45deg, rgba(255, 255, 255, 0.03) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.03) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 8px 8px;
    box-shadow:
        inset 0 0 0 2px rgba(var(--accent-rgb), 0.16),
        0 2px 0 rgba(0, 0, 0, 0.4);
}

.leaderboard-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 0.75rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid rgba(var(--accent-rgb), 0.32);
    box-shadow: 0 2px 0 rgba(255, 255, 255, 0.04);
}

.leaderboard-title {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 1.15rem;
    letter-spacing: 0.06em;
    margin-bottom: 0.25rem;
    text-shadow: 0 2px 0 rgba(0, 0, 0, 0.45);
}

/* Pixel-art crests flanking the heading (PRD §5, §9) — mirrored + tilted. */
.leaderboard-crest {
    width: 1.5rem;
    height: auto;
    image-rendering: pixelated;
    transform: rotate(-4deg);
    filter: drop-shadow(0 2px 0 rgba(0, 0, 0, 0.45));
}

.leaderboard-crest--flip {
    transform: rotate(4deg) scaleX(-1);
}

/* Sparkle on demand, driven by LeaderboardEffects (PRD §9, §24). */
.leaderboard-crest--sparkle {
    animation: lb-crest-sparkle 0.65s steps(2, end) 4;
}

@keyframes lb-crest-sparkle {
    0% {
        filter: drop-shadow(0 0 0 rgba(var(--lb-gold-rgb), 0));
    }
    50% {
        filter: drop-shadow(0 0 7px rgba(var(--lb-gold-rgb), 0.95));
    }
    100% {
        filter: drop-shadow(0 2px 0 rgba(0, 0, 0, 0.45));
    }
}

.leaderboard-subtitle {
    letter-spacing: 0.04em;
}

.leaderboard-search {
    flex: 0 1 240px;
    min-width: 180px;
}

.leaderboard-search .form-control {
    background: var(--input-bg);
    border-color: var(--panel-border);
    color: var(--text);
}

.leaderboard-search .form-control:focus {
    background: var(--input-bg);
    border-color: var(--accent);
    color: var(--text);
    box-shadow: 0 0 0 0.2rem rgba(var(--accent-rgb), 0.2);
}

.leaderboard-search .form-control::placeholder {
    color: var(--muted);
}

/* Empty note (no minimum-games text) should not leave a gap in the card */
.leaderboard-note:empty {
    display: none;
}

.leaderboard-you {
    padding: 0.7rem 0.9rem;
    border-radius: 8px;
    border: 1px solid rgba(var(--accent-rgb), 0.4);
    background: rgba(var(--accent-rgb), 0.08);
}

.lb-you-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.35rem;
}

.lb-you-line {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}

.lb-you-stats {
    margin-bottom: 0.25rem;
}

.lb-you-hint {
    color: var(--text);
}


.leaderboard-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.leaderboard-table th {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-align: right;
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--panel-border);
    white-space: nowrap;
}

.leaderboard-table td {
    padding: 0.55rem 0.6rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    vertical-align: middle;
}

.leaderboard-table tbody tr:last-child td {
    border-bottom: none;
}

.lb-col-rank {
    width: 5rem;
    text-align: left;
}

.lb-col-player {
    text-align: left;
    min-width: 8rem;
}

.lb-col-stat {
    text-align: right;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

/* Pixel-art crown / medal beside a podium rank (PRD §9) */
.lb-rank-sprite {
    display: inline-block;
    width: 1.1rem;
    height: auto;
    margin-right: 0.35rem;
    vertical-align: -0.18rem;
    image-rendering: pixelated;
}

.lb-rank-chip {
    display: inline-block;
    min-width: 2rem;
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
    text-align: center;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--panel-border);
}

.lb-username {
    font-weight: 600;
}

.lb-you-badge {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1.2;
    vertical-align: middle;
    background: rgba(var(--accent-rgb), 0.2);
    border: 1px solid rgba(var(--accent-rgb), 0.55);
    color: var(--guest-badge-text);
}


/* Podium rows — top three get a tinted row plus a coloured edge (PRD §9) */
.lb-row--gold {
    --lb-podium-rgb: var(--lb-gold-rgb);
    background: rgba(var(--lb-gold-rgb), 0.12);
}

.lb-row--silver {
    --lb-podium-rgb: var(--lb-silver-rgb);
    background: rgba(var(--lb-silver-rgb), 0.1);
}

.lb-row--bronze {
    --lb-podium-rgb: var(--lb-bronze-rgb);
    background: rgba(var(--lb-bronze-rgb), 0.12);
}

.lb-row--gold td:first-child {
    box-shadow: inset 3px 0 0 var(--lb-gold);
}

.lb-row--silver td:first-child {
    box-shadow: inset 3px 0 0 var(--lb-silver);
}

.lb-row--bronze td:first-child {
    box-shadow: inset 3px 0 0 var(--lb-bronze);
}

.lb-row--gold .lb-rank-chip {
    border-color: var(--lb-gold);
    color: var(--lb-gold);
}

.lb-row--silver .lb-rank-chip {
    border-color: var(--lb-silver);
    color: var(--lb-silver);
}

.lb-row--bronze .lb-rank-chip {
    border-color: var(--lb-bronze);
    color: var(--lb-bronze);
}

/* Current player highlight (PRD §10) */
.lb-row--you {
    background: rgba(var(--accent-rgb), 0.14);
}

.lb-row--you td:first-child {
    box-shadow: inset 3px 0 0 var(--accent);
}

.lb-row:hover td {
    background: rgba(255, 255, 255, 0.03);
}

/* Keyboard focus follows the highlighted row instead of the cell */
.leaderboard-table tr.lb-row:focus-within {
    outline: 2px solid rgba(var(--accent-rgb), 0.6);
    outline-offset: -2px;
}

/* Compact-layout disclosure control (PRD §23) — hidden on wide screens */
.lb-row-toggle {
    display: none;
    width: 1.6rem;
    height: 1.6rem;
    padding: 0;
    margin-left: 0.45rem;
    border-radius: 4px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1;
    vertical-align: middle;
    touch-action: manipulation;
}

.lb-row-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ---- Subtle animation (PRD §24). Every class below has a static equivalent. */
.lb-row--enter {
    animation: lb-row-enter 0.22s steps(4, end) 1;
}

@keyframes lb-row-enter {
    from {
        opacity: 0;
        transform: translateX(16px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

.lb-row--glow {
    animation: lb-row-glow 1.6s steps(4, end) 1;
}

@keyframes lb-row-glow {
    from {
        box-shadow: inset 0 0 0 2px rgba(var(--lb-podium-rgb, var(--accent-rgb)), 0.65);
    }
    to {
        box-shadow: inset 0 0 0 2px rgba(var(--lb-podium-rgb, var(--accent-rgb)), 0);
    }
}

.lb-row--you.lb-row--flash {
    animation: lb-row-flash 1.2s steps(3, end) 1;
}

@keyframes lb-row-flash {
    0%,
    100% {
        background: rgba(var(--accent-rgb), 0.14);
    }
    50% {
        background: rgba(var(--accent-rgb), 0.34);
    }
}

/* ---- Loading state (PRD §31): 8-bit spinner + placeholder rows ------------- */
.lb-spinner {
    display: inline-block;
    width: 0.5rem;
    height: 0.5rem;
    vertical-align: -0.1rem;
    background: var(--accent);
    transform-origin: 0.5rem 0.5rem;
    box-shadow:
        0.5rem 0 0 rgba(var(--accent-rgb), 0.7),
        0 0.5rem 0 rgba(var(--accent-rgb), 0.45),
        0.5rem 0.5rem 0 rgba(var(--accent-rgb), 0.25);
    animation: lb-spin 0.8s steps(4, end) infinite;
}

@keyframes lb-spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.lb-skeleton-cell {
    padding: 0.55rem 0.6rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.lb-skeleton-bar {
    display: block;
    width: 100%;
    height: 0.85rem;
    border-radius: 3px;
    background-image: repeating-linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 0 12px,
        rgba(255, 255, 255, 0.035) 12px 24px
    );
    background-size: 24px 100%;
    animation: lb-skeleton-shimmer 1.2s steps(6, end) infinite;
}

@keyframes lb-skeleton-shimmer {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 24px 0;
    }
}

/* ---- Empty / error state (PRD §31) --------------------------------------- */
.leaderboard-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    padding: 1.25rem 0.75rem;
    text-align: center;
    border: 1px dashed var(--panel-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
}

.leaderboard-state-icon {
    width: 2rem;
    height: auto;
    image-rendering: pixelated;
    opacity: 0.9;
}

.leaderboard-status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 1.5rem;
}

.leaderboard-status {
    color: var(--muted);
}

.leaderboard-status--error {
    color: var(--danger);
    font-weight: 600;
}

/* "Showing 26–50 of 240 players" / "Loading rankings…" */
.leaderboard-summary {
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.leaderboard-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.leaderboard-page-label {
    font-size: 0.85rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------------------
   Compact / mobile layout (PRD §23)

   Below 768px each player becomes a tap-to-expand card:

       #1  👑 KnightRider           [+]
           WINS 42
           WIN % 73.7%

   The lower-priority columns stay collapsed until the row is expanded, and the
   table headers stay in the accessibility tree (visually hidden, not removed).
   --------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .leaderboard-card {
        gap: 0.6rem;
    }

    .leaderboard-title {
        font-size: 1rem;
    }

    .leaderboard-crest {
        width: 1.15rem;
    }

    .leaderboard-search {
        flex: 1 1 100%;
    }

    .leaderboard-table thead {
        position: absolute !important;
        width: 1px !important;
        height: 1px !important;
        margin: -1px !important;
        padding: 0 !important;
        overflow: hidden !important;
        clip: rect(0, 0, 0, 0) !important;
        white-space: nowrap !important;
        border: 0 !important;
    }

    .leaderboard-table,
    .leaderboard-table tbody,
    .leaderboard-table tr.lb-row,
    .leaderboard-table tr.lb-skeleton-row {
        display: block;
        width: 100%;
    }

    .leaderboard-table tr.lb-row {
        margin-bottom: 0.5rem;
        padding: 0.55rem 0.65rem;
        border: 1px solid var(--panel-border);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.02);
    }

    .leaderboard-table tr.lb-row--you {
        border-color: rgba(var(--accent-rgb), 0.55);
    }

    .leaderboard-table tr.lb-row--gold {
        border-color: rgba(var(--lb-gold-rgb), 0.55);
    }

    .leaderboard-table tr.lb-row--silver {
        border-color: rgba(var(--lb-silver-rgb), 0.5);
    }

    .leaderboard-table tr.lb-row--bronze {
        border-color: rgba(var(--lb-bronze-rgb), 0.55);
    }

    .leaderboard-table tr.lb-row:last-child {
        margin-bottom: 0;
    }

    .leaderboard-table td {
        display: block;
        padding: 0;
        border: none;
        text-align: left;
    }

    .leaderboard-table td.lb-col-rank,
    .leaderboard-table td.lb-col-player {
        display: inline-block;
        width: auto;
        min-width: 0;
    }

    .leaderboard-table td.lb-col-rank {
        margin-right: 0.35rem;
    }

    .leaderboard-table td.lb-col-player {
        font-size: 1rem;
    }

    .leaderboard-table td.lb-col-stat {
        font-size: 0.85rem;
        white-space: normal;
    }

    .leaderboard-table td.lb-col-stat::before {
        content: attr(data-label);
        display: inline-block;
        min-width: 3.6rem;
        margin-right: 0.35rem;
        color: var(--muted);
        font-size: 0.68rem;
        text-transform: uppercase;
        letter-spacing: 0.07em;
    }

    /* Collapsed extras — revealed by the row toggle / row tap (PRD §23) */
    .leaderboard-table td.lb-col-low {
        display: none;
    }

    .leaderboard-table tr.lb-row--expanded td.lb-col-low {
        display: block;
    }

    .lb-row-toggle {
        display: inline-block;
    }

    .lb-skeleton-cell {
        display: block;
        padding: 0.55rem 0.65rem;
    }
}

/* Keyboard users get the extra statistics without a pointer */
@media (hover: none) and (max-width: 768px) {
    .leaderboard-table td.lb-col-stat::before {
        min-width: 3.2rem;
    }
}

/* Motion is opt-out: keep every state readable with no animation at all */
@media (prefers-reduced-motion: reduce) {
    .lb-spinner,
    .lb-skeleton-bar,
    .lb-row--enter,
    .lb-row--glow,
    .lb-row--flash,
    .leaderboard-crest--sparkle {
        animation: none !important;
    }
}