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

:root {
    --bg-img: url("assets/bg/background.png");
    --panel: rgba(8, 20, 35, 0.82);
    --panel-strong: rgba(5, 14, 26, 0.94);
    --text: #f4f7fb;
    --text-soft: rgba(230, 237, 243, 0.76);
    --border: rgba(255, 255, 255, 0.18);
    --accent: #00ff88;
    --accent-alt: #ffcf4a;
    --danger: #ff5267;
    --shadow: rgba(1, 8, 17, 0.52);
    --pixel-font: "Press Start 2P", monospace;
}

html {
    min-width: 320px;
    background: #102f48;
}

body {
    min-height: 100vh;
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    background-color: #245986;
    background-image: linear-gradient(rgba(10, 25, 45, 0.04), rgba(4, 17, 29, 0.14)), var(--bg-img);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    cursor: none;
}

body.dark {
    --bg-img: url("assets/bg/background_d.png");
    --panel: rgba(4, 9, 20, 0.88);
    --panel-strong: rgba(1, 5, 13, 0.96);
    background-color: #080f22;
}

button,
.square,
.piece {
    cursor: none;
}

button {
    font: inherit;
}

.topo {
    width: 100%;
    min-height: 88px;
    padding: 16px clamp(16px, 3vw, 42px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    background: rgba(2, 11, 22, 0.56);
    backdrop-filter: blur(9px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 30px rgba(2, 10, 20, 0.16);
    position: relative;
    z-index: 20;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--pixel-font);
    font-size: clamp(14px, 1.6vw, 19px);
    line-height: 1.35;
    letter-spacing: 0.5px;
    text-shadow: 0 3px 0 rgba(0, 0, 0, 0.58);
}

.logo img {
    width: 30px;
    height: 30px;
    object-fit: contain;
    image-rendering: pixelated;
}

.acoes {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn {
    width: 52px;
    height: 52px;
    padding: 9px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 7px 20px rgba(0, 0, 0, 0.15);
    transition: transform 150ms ease, background-color 150ms ease, opacity 150ms ease;
    position: relative;
}

.btn:hover:not(:disabled),
.btn:focus-visible:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn:active:not(:disabled) {
    transform: scale(0.94);
}

.btn:disabled {
    opacity: 0.38;
    filter: grayscale(1);
}

.btn-icon img {
    width: 30px;
    height: 30px;
    object-fit: contain;
    image-rendering: pixelated;
    pointer-events: none;
}

.btn-text-icon span {
    font-family: var(--pixel-font);
    font-size: 24px;
    line-height: 1;
    transform: translateY(-1px);
}

.layout {
    width: min(1420px, 100%);
    margin: 0 auto;
    padding: 22px clamp(16px, 2.5vw, 38px) 18px;
    flex: 1;
    display: grid;
    grid-template-columns: 270px minmax(400px, 580px) 300px;
    justify-content: center;
    align-items: start;
    gap: clamp(16px, 2vw, 28px);
}

.painel {
    min-width: 0;
    padding: 18px;
    background: var(--panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 18px 42px var(--shadow);
}

.painel h2,
.modal-card h2 {
    font-family: var(--pixel-font);
    font-size: 12px;
    line-height: 1.5;
    margin-bottom: 17px;
}

.painel h3 {
    font-family: var(--pixel-font);
    font-size: 8px;
    line-height: 1.5;
    color: var(--text-soft);
    margin-bottom: 9px;
}

.status-line {
    min-height: 35px;
    display: grid;
    grid-template-columns: 62px minmax(0, 1fr) 30px;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.status-line > span:first-child {
    color: var(--text-soft);
    font-size: 13px;
}

.status-line strong {
    color: var(--accent);
    font-size: 14px;
}

.status-game {
    grid-template-columns: 62px minmax(0, 1fr);
}

#estado-jogo[data-status="check"],
#estado-jogo[data-status="checkmate"] {
    color: var(--danger);
}

#estado-jogo[data-status^="draw"],
#estado-jogo[data-status="stalemate"] {
    color: var(--accent-alt);
}

.turn-cursor {
    width: 30px;
    height: 30px;
    display: inline-block;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    image-rendering: pixelated;
}

.turn-cursor.user-turn {
    background-image: url("assets/cursor/user_idle.png");
}

.turn-cursor.ai-turn {
    background-image: url("assets/cursor/ai_idle.png");
}

.mensagem-jogo {
    min-height: 68px;
    padding: 14px 0 12px;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.45;
}

.legend {
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: grid;
    gap: 8px;
    color: var(--text-soft);
    font-size: 11px;
}

.legend span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-mark {
    width: 14px;
    height: 14px;
    display: inline-block;
    border-radius: 3px;
    flex: 0 0 auto;
}

.legend-mark.legal {
    background: rgba(0, 255, 136, 0.28);
    border: 2px solid var(--accent);
}

.legend-mark.last {
    background: rgba(255, 207, 74, 0.45);
    border: 1px solid var(--accent-alt);
}

.legend-mark.check {
    background: rgba(255, 38, 70, 0.52);
    border: 1px solid var(--danger);
}

.game-area {
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
}

.board-shell {
    width: 100%;
    max-width: 580px;
    padding: 5px;
    border-radius: 20px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.32), rgba(4, 13, 23, 0.68));
    box-shadow: 0 25px 55px rgba(0, 0, 0, 0.42), inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.board {
    width: 100%;
    aspect-ratio: 1;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    border-radius: 15px;
    overflow: hidden;
    position: relative;
    image-rendering: pixelated;
    user-select: none;
    touch-action: none;
}

.square {
    min-width: 0;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    isolation: isolate;
    outline: none;
}

.square.light {
    background: url("assets/board/tile_light.png") center / cover no-repeat;
}

.square.dark {
    background: url("assets/board/tile_dark.png") center / cover no-repeat;
}

.square::after,
.square::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
}

.square.last-move::after {
    z-index: 1;
    opacity: 1;
    background: rgba(255, 205, 55, 0.34);
    box-shadow: inset 0 0 0 2px rgba(255, 236, 140, 0.28);
}

.square.selected {
    z-index: 3;
    box-shadow: inset 0 0 0 4px var(--accent), inset 0 0 18px rgba(0, 255, 136, 0.44);
}

.square:focus-visible {
    z-index: 8;
    box-shadow: inset 0 0 0 4px #ffffff, inset 0 0 0 7px #183850;
}

.square.king-in-check::after {
    z-index: 2;
    opacity: 1;
    background: radial-gradient(circle, rgba(255, 38, 70, 0.72), rgba(180, 0, 28, 0.25) 62%, transparent 75%);
    animation: checkPulse 900ms ease-in-out infinite alternate;
}

.square.invalid-move::before {
    z-index: 9;
    opacity: 1;
    background: url("assets/error_tile.png") center / cover no-repeat;
    animation: invalidFade 850ms ease-out forwards;
}

.hint-move {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    background: url("assets/ok_tile.png") center / cover no-repeat;
    opacity: 0.68;
}

.capture-target .hint-move {
    opacity: 0.93;
    filter: saturate(1.3) contrast(1.05);
}

.piece {
    width: 86%;
    height: 86%;
    object-fit: contain;
    position: relative;
    z-index: 5;
    image-rendering: pixelated;
    user-select: none;
    -webkit-user-drag: none;
    touch-action: none;
    filter: drop-shadow(0 5px 1px rgba(0, 0, 0, 0.2));
    animation: pieceBob 2s ease-in-out infinite;
    transition: opacity 120ms ease, transform 120ms ease, filter 120ms ease;
}

.piece.movable:hover {
    filter: drop-shadow(0 7px 2px rgba(0, 0, 0, 0.28)) brightness(1.07);
}

.piece-black {
    filter: drop-shadow(0 0 1px rgba(255, 255, 255, 0.78)) drop-shadow(0 5px 1px rgba(0, 0, 0, 0.24));
}

.piece-black.movable:hover {
    filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.82)) drop-shadow(0 7px 2px rgba(0, 0, 0, 0.3)) brightness(1.08);
}

.piece.drag-origin {
    opacity: 0.18;
}

.board.game-over .piece {
    animation-play-state: paused;
}

.floating-piece {
    position: fixed;
    z-index: 999998;
    pointer-events: none;
    object-fit: contain;
    image-rendering: pixelated;
    transform: translate(-50%, -58%) scale(1.08);
    filter: drop-shadow(0 13px 4px rgba(0, 0, 0, 0.36));
}

.coordinate {
    position: absolute;
    z-index: 7;
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(8px, 1.1vw, 11px);
    font-weight: 800;
    line-height: 1;
    color: rgba(8, 28, 42, 0.66);
    text-shadow: 0 1px rgba(255, 255, 255, 0.24);
    pointer-events: none;
}

.square.dark .coordinate {
    color: rgba(255, 248, 215, 0.72);
    text-shadow: 0 1px rgba(0, 0, 0, 0.35);
}

.rank-label {
    top: 4px;
    left: 4px;
}

.file-label {
    right: 4px;
    bottom: 3px;
}

.board-help {
    width: 100%;
    color: rgba(255, 255, 255, 0.84);
    font-size: 11px;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.75);
}

.painel-partida {
    display: grid;
    gap: 15px;
}

.painel-partida > h2 {
    margin-bottom: 0;
}

.capture-section {
    padding-bottom: 13px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.captured-list {
    min-height: 34px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 2px;
}

.captured-list img {
    width: 31px;
    height: 31px;
    object-fit: contain;
    image-rendering: pixelated;
}

.empty-state,
.empty-history {
    color: rgba(230, 237, 243, 0.48);
    font-size: 11px;
    font-style: italic;
}

.history-section {
    min-width: 0;
}

.history-head,
.history-row {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr) minmax(0, 1fr);
    gap: 7px;
    align-items: center;
}

.history-head {
    margin-bottom: 5px;
    color: rgba(230, 237, 243, 0.5);
    font-size: 9px;
    text-transform: uppercase;
}

.move-history {
    max-height: 250px;
    padding-right: 4px;
    list-style: none;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.28) transparent;
}

.history-row {
    min-height: 30px;
    padding: 5px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 12px;
}

.move-number {
    color: var(--text-soft);
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000000;
    display: grid;
    place-items: center;
    padding: 20px;
    background: rgba(0, 5, 12, 0.76);
    backdrop-filter: blur(6px);
}

.modal.is-hidden {
    display: none;
}

.modal-card {
    width: min(520px, 100%);
    padding: clamp(20px, 4vw, 32px);
    border: 2px solid rgba(255, 255, 255, 0.24);
    border-radius: 20px;
    background: var(--panel-strong);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.62);
    text-align: center;
}

.modal-kicker {
    margin-bottom: 10px;
    color: var(--accent);
    font-family: var(--pixel-font);
    font-size: 8px;
    text-transform: uppercase;
}

.promotion-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.promotion-options button {
    min-width: 0;
    padding: 10px 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 7px;
    border: 1px solid var(--border);
    border-radius: 13px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    font-size: 11px;
}

.promotion-options button:hover,
.promotion-options button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    background: rgba(0, 255, 136, 0.14);
    transform: translateY(-2px);
}

.promotion-options img {
    width: min(62px, 100%);
    aspect-ratio: 1;
    object-fit: contain;
    image-rendering: pixelated;
}

.modal-cancel {
    margin-top: 18px;
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text-soft);
    background: transparent;
    font-size: 12px;
}

.modal-cancel:hover,
.modal-cancel:focus-visible {
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.5);
    outline: none;
}

.cursor {
    position: fixed;
    left: 0;
    top: 0;
    width: clamp(40px, 5.2vmin, 56px);
    height: clamp(40px, 5.2vmin, 56px);
    z-index: 999999;
    pointer-events: none;
    background-repeat: no-repeat;
    background-size: contain;
    image-rendering: pixelated;
    transform: translate(-6px, -6px);
}

.cursor.user-turn.idle { background-image: url("assets/cursor/user_idle.png"); }
.cursor.user-turn.grab { background-image: url("assets/cursor/user_grab.png"); }
.cursor.user-turn.hold { background-image: url("assets/cursor/user_hold.png"); }
.cursor.user-turn.drop { background-image: url("assets/cursor/user_drop.png"); }
.cursor.ai-turn.idle { background-image: url("assets/cursor/ai_idle.png"); }
.cursor.ai-turn.grab { background-image: url("assets/cursor/ai_grab.png"); }
.cursor.ai-turn.hold { background-image: url("assets/cursor/ai_hold.png"); }
.cursor.ai-turn.drop { background-image: url("assets/cursor/ai_drop.png"); }

.is-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

#btn-tema {
    touch-action: none;
    z-index: 30;
}

#btn-tema.dragging {
    transition: none;
}

#btn-tema.returning {
    transition: transform 500ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.e-tree {
    position: fixed;
    right: 22px;
    bottom: 16px;
    width: 104px;
    height: auto;
    z-index: 5000;
    image-rendering: pixelated;
    transition: opacity 300ms ease, visibility 300ms ease, filter 180ms ease, transform 180ms ease;
}

.e-tree.discovered {
    filter: brightness(1.65);
    transform: rotate(-3deg) scale(1.05);
}

.e-tree-tooltip {
    position: fixed;
    right: 22px;
    bottom: 130px;
    z-index: 5001;
    padding: 10px 12px;
    border: 2px solid var(--border);
    border-radius: 10px;
    color: #fff;
    background: rgba(0, 0, 0, 0.8);
    font-family: var(--pixel-font);
    font-size: 8px;
    line-height: 1.4;
    transition: opacity 180ms ease, visibility 180ms ease;
}

.rodape {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 10px 0 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.68);
    text-align: center;
    font-size: 11px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.75);
}

@keyframes pieceBob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4%); }
}

@keyframes checkPulse {
    from { filter: saturate(1); }
    to { filter: saturate(1.45) brightness(1.15); }
}

@keyframes invalidFade {
    0%, 30% { opacity: 1; transform: scale(1); }
    100% { opacity: 0; transform: scale(0.9); }
}

@media (max-width: 1180px) {
    .layout {
        grid-template-columns: 225px minmax(380px, 540px) 255px;
        gap: 15px;
        padding-inline: 14px;
    }

    .painel {
        padding: 15px;
    }

    .history-row {
        grid-template-columns: 26px minmax(0, 1fr) minmax(0, 1fr);
        font-size: 11px;
    }
}

@media (max-width: 900px) {
    body {
        background-position: center top;
        cursor: auto;
    }

    button,
    .square,
    .piece {
        cursor: auto;
    }

    .cursor {
        display: none;
    }

    .topo {
        min-height: 78px;
        padding: 12px 16px;
    }

    .layout {
        width: min(620px, 100%);
        grid-template-columns: minmax(0, 1fr);
        gap: 14px;
        padding: 14px 14px 20px;
    }

    .painel-status {
        display: grid;
        grid-template-columns: 1fr 1fr;
        column-gap: 20px;
    }

    .painel-status h2,
    .mensagem-jogo,
    .legend {
        grid-column: 1 / -1;
    }

    .painel-status h2 {
        margin-bottom: 8px;
    }

    .status-game {
        grid-template-columns: 56px minmax(0, 1fr);
    }

    .mensagem-jogo {
        min-height: 0;
    }

    .legend {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .game-area {
        width: 100%;
    }

    .board-shell {
        width: min(94vw, 580px);
    }

    .painel-partida {
        grid-template-columns: 1fr 1fr;
    }

    .painel-partida > h2,
    .history-section {
        grid-column: 1 / -1;
    }

    .capture-section {
        min-width: 0;
        border-bottom: 0;
    }

    .move-history {
        max-height: 190px;
    }

    .e-tree {
        width: 78px;
        right: 10px;
        bottom: 8px;
    }

    .e-tree-tooltip {
        right: 10px;
        bottom: 92px;
    }
}

@media (max-width: 520px) {
    .topo {
        min-height: 68px;
        gap: 10px;
    }

    .logo {
        gap: 7px;
        font-size: 11px;
    }

    .logo img {
        width: 24px;
        height: 24px;
    }

    .acoes {
        gap: 6px;
    }

    .btn {
        width: 42px;
        height: 42px;
        padding: 7px;
        border-radius: 11px;
    }

    .btn-icon img {
        width: 25px;
        height: 25px;
    }

    .btn-text-icon span {
        font-size: 19px;
    }

    .layout {
        padding: 10px 10px 18px;
    }

    .painel {
        padding: 14px;
        border-radius: 14px;
    }

    .painel-status {
        grid-template-columns: 1fr;
    }

    .painel-status > * {
        grid-column: 1;
    }

    .status-line {
        grid-template-columns: 58px minmax(0, 1fr) 28px;
    }

    .status-game {
        grid-template-columns: 58px minmax(0, 1fr);
    }

    .legend {
        grid-template-columns: 1fr;
    }

    .board-shell {
        width: 100%;
        padding: 4px;
        border-radius: 15px;
    }

    .board {
        border-radius: 11px;
    }

    .board-help {
        font-size: 10px;
    }

    .painel-partida {
        grid-template-columns: 1fr;
    }

    .painel-partida > h2,
    .history-section {
        grid-column: 1;
    }

    .capture-section {
        padding-bottom: 11px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .promotion-options {
        grid-template-columns: repeat(2, 1fr);
    }

    .e-tree,
    .e-tree-tooltip {
        display: none;
    }
}

@media (max-height: 720px) and (min-width: 901px) {
    .layout {
        padding-top: 12px;
    }

    .board-shell {
        width: min(68vh, 540px);
    }

    .move-history {
        max-height: 180px;
    }
}

@media (hover: none), (pointer: coarse) {
    body,
    button,
    .square,
    .piece {
        cursor: auto;
    }

    .cursor {
        display: none;
    }

    .piece {
        animation-duration: 2.6s;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 1ms !important;
    }
}