:root {
    --board-size: 5;
    --cell-size: clamp(36px, 10.5vw, 70px);
    --board-gap: 5px;
    --control-size: clamp(34px, 9vw, 44px);
    --animation-duration: 500ms;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    padding: max(12px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    background: #1e1e1e;
    color: #fff;
    font-family: Arial, sans-serif;
    overscroll-behavior: none;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

h1 {
    margin: 0 0 16px;
    font-size: clamp(22px, 6vw, 32px);
}

.game-shell {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: min(100%, 720px);
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

.players-panel {
    width: min(100%, 620px);
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 4px;
}

.player-panel {
    min-width: 0;
    padding: 9px 10px;
    border: 2px solid rgba(255, 255, 255, 0.16);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.045);
    opacity: 0.62;
    transition: opacity 140ms ease, border-color 140ms ease, background 140ms ease;
}

.player-panel--active {
    opacity: 1;
    border-color: rgba(255, 255, 255, 0.82);
    background: rgba(255, 255, 255, 0.09);
}

.player-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}

.player-panel__name {
    font-size: 14px;
    font-weight: 700;
}

.player-panel__turn {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.06em;
    opacity: 0.8;
}

.player-score {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    min-height: 18px;
    margin-bottom: 8px;
}

.player-score[hidden] {
    display: none;
}

.player-score__token {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.75);
    background: rgba(255, 255, 255, 0.22);
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.18);
}

.player-panel--active .player-score__token {
    background: rgba(255, 255, 255, 0.78);
}

.player-queue {
    display: flex;
    align-items: center;
    gap: 7px;
    overflow-x: auto;
    padding-bottom: 2px;
}

.player-queue__tile {
    width: var(--cell-size);
    height: var(--cell-size);
    flex: 0 0 auto;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    opacity: 0.72;
}

.player-queue__tile--current {
    opacity: 1;
    border-width: 2px;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.12);
}

.winner-message {
    width: min(100%, 620px);
    padding: 10px 14px;
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.12);
    font-size: clamp(16px, 4vw, 22px);
    font-weight: 700;
    text-align: center;
}

.board-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    touch-action: none;
}

#board {
    display: grid;
    grid-template-columns: repeat(var(--board-size), var(--cell-size));
    grid-template-rows: repeat(var(--board-size), var(--cell-size));
    gap: var(--board-gap);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    transition: outline-color 120ms ease, filter 120ms ease;
}

.cell--empty {
    background-color: rgba(255, 255, 255, 0.04);
    border-style: dashed;
}

.cell--target {
    outline: 3px solid rgba(255, 255, 255, 0.75);
    outline-offset: -3px;
    filter: brightness(1.12);
}

.insertion-controls {
    display: grid;
    gap: var(--board-gap);
}

.insertion-controls--top {
    grid-template-columns: repeat(var(--board-size), var(--cell-size));
    margin-left: calc(var(--control-size) + 16px);
    margin-right: calc(var(--control-size) + 16px);
}

.insertion-controls--side {
    grid-template-rows: repeat(var(--board-size), var(--cell-size));
}

.insertion-control {
    width: var(--control-size);
    height: var(--control-size);
    align-self: center;
    justify-self: center;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 0;
    border: 2px solid rgba(255, 255, 255, 0.65);
    border-radius: 50%;
    color: #111;
    font-size: clamp(16px, 4vw, 22px);
    font-weight: 700;
    cursor: grab;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;

    transition: transform 80ms linear, box-shadow 120ms ease, border-color 120ms ease;
}

.insertion-control:active {
    cursor: grabbing;
}

.insertion-control--dragging {
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.18);
}

.insertion-control--ready {
    border-color: #fff;
    box-shadow: 0 0 0 5px rgba(255, 255, 255, 0.28);
}

.cell--clearing {
    animation: clear-tile var(--animation-duration) ease-in forwards;
}

.cell--appearing {
    animation: appear-tile var(--animation-duration) ease-out;
}

.cell--falling {
    animation: fall-tile var(--animation-duration) ease-out;
}

@keyframes clear-tile {
    to {
        opacity: 0.1;
        transform: scale(0.55);
    }
}

@keyframes appear-tile {
    from {
        opacity: 0.1;
        transform: scale(0.55);
    }
}

@keyframes fall-tile {
    from {
        transform: translateY(var(--fall-offset));
    }
}

.debug-panel {
    position: fixed;
    top: 16px;
    left: 16px;

    display: flex;
    flex-direction: column;
    gap: 10px;

    max-height: calc(100vh - 32px);
    overflow-y: auto;
    padding: 12px;

    background-color: rgba(20, 20, 20, 0.9);
    border: 1px solid #555;
    border-radius: 6px;

    color: #fff;
    font-family: Arial, sans-serif;
    z-index: 1000;
}

.debug-panel__title {
    margin: 0;
    font-size: 14px;
    line-height: 1;
}

.debug-panel__field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 12px;
}

.debug-panel__select {
    min-width: 76px;
}

.debug-panel__button {
    padding: 8px 12px;
    border: 1px solid #777;
    border-radius: 4px;
    background-color: #333;
    color: #fff;
    cursor: pointer;
}

.debug-panel__button:hover {
    background-color: #444;
}

@media (max-width: 620px) {
    :root {
        --board-gap: 4px;
    }

    body {
        justify-content: flex-start;
        overflow-x: hidden;
    }

    h1 {
        margin-bottom: 10px;
    }

    .game-shell {
        gap: 6px;
    }

    .players-panel {
        gap: 6px;
    }

    .player-panel {
        padding: 7px 8px;
    }

    .player-panel__header {
        margin-bottom: 6px;
    }

    .player-score {
        margin-bottom: 6px;
    }

    .player-queue {
        gap: 5px;
    }

    .player-queue__tile {
        border-radius: 8px;
    }

    .board-row {
        gap: 5px;
    }

    .insertion-controls--top {
        margin-left: calc(var(--control-size) + 10px);
        margin-right: calc(var(--control-size) + 10px);
    }

    .cell {
        border-radius: 8px;
    }

    .debug-panel {
        position: static;
        width: min(100%, 420px);
        max-height: none;
        margin-top: 14px;
        order: 10;
    }
}

@media (max-width: 390px) {
    :root {
        --cell-size: clamp(34px, 9.8vw, 42px);
        --control-size: 34px;
        --board-gap: 3px;
    }

    body {
        padding-left: max(6px, env(safe-area-inset-left));
        padding-right: max(6px, env(safe-area-inset-right));
    }

    .players-panel {
        gap: 4px;
    }

    .player-panel {
        padding: 6px;
    }

    .player-panel__name {
        font-size: 12px;
    }

    .player-panel__turn {
        font-size: 9px;
    }
}

.debug-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.debug-panel__content {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.debug-panel__toggle {
    padding: 5px 8px;
    border: 1px solid #777;
    border-radius: 4px;
    background: #333;
    color: #fff;
    font-size: 11px;
    cursor: pointer;
}

.debug-panel--collapsed .debug-panel__content {
    display: none;
}

@media (max-width: 620px) {
    .debug-panel {
        width: auto;
        max-width: calc(100% - 20px);
        margin-top: 10px;
        padding: 8px 10px;
    }

    .debug-panel--collapsed {
        align-self: flex-start;
    }
}

/* Testovací kameny musí být rozlišitelné tvarem, ne pouze barvou. */
.cell,
.player-queue__tile {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(17px, 5vw, 30px);
    font-weight: 800;
    line-height: 1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.42);
    user-select: none;
    -webkit-user-select: none;
}

body,
.game-shell,
.debug-panel,
.debug-panel * {
    user-select: none;
    -webkit-user-select: none;
}

.debug-panel select,
.debug-panel input,
.debug-panel button {
    touch-action: manipulation;
}

/* Laboratoř je stále dostupná, ale nezabírá místo v toku stránky. */
.debug-panel {
    top: auto;
    bottom: max(10px, env(safe-area-inset-bottom));
    left: max(10px, env(safe-area-inset-left));
    max-height: min(70dvh, 560px);
}

@media (max-width: 620px) {
    body {
        padding-bottom: max(62px, calc(env(safe-area-inset-bottom) + 52px));
    }

    .debug-panel {
        position: fixed;
        bottom: max(6px, env(safe-area-inset-bottom));
        left: max(6px, env(safe-area-inset-left));
        width: calc(100% - max(12px, env(safe-area-inset-left) + env(safe-area-inset-right)));
        max-width: none;
        max-height: 58dvh;
        margin: 0;
        overflow-y: auto;
    }

    .debug-panel--collapsed {
        width: auto;
        max-width: calc(100% - 12px);
    }
}

/* Výrazná informace o tahu, aby ji hráč nemusel hledat v malém panelu. */
.turn-banner {
    width: min(100%, 620px);
    padding: 8px 12px;
    border: 2px solid rgba(255, 255, 255, 0.88);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.12);
    font-size: clamp(14px, 4vw, 20px);
    font-weight: 900;
    letter-spacing: 0.04em;
    text-align: center;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.08);
}

.player-panel--active {
    transform: translateY(-2px);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.14), 0 8px 20px rgba(0, 0, 0, 0.28);
}

.player-panel__turn {
    padding: 3px 6px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
}

.player-panel--active .player-panel__turn {
    background: #fff;
    color: #111;
    opacity: 1;
}

.shared-queue-panel {
    width: min(100%, 360px);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 7px 10px;
    border: 1px solid rgba(255, 255, 255, 0.38);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.07);
}

.shared-queue-panel[hidden] {
    display: none;
}

.shared-queue-panel__label {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.04em;
}

.shared-queue-panel .player-queue {
    overflow: visible;
    padding: 0;
}

/* Testovací ovládání bez šipek: tažení začíná přímo na krajním kameni. */
:root {
    --queue-tile-scale: 1.1;
    --symbol-scale: 1.2;
    --queue-gap: 10px;
}

.board-row {
    gap: 0;
}

#board {
    touch-action: none;
    cursor: grab;
}

#board:active {
    cursor: grabbing;
}

.cell--drag-source {
    outline: 3px solid rgba(255, 255, 255, 0.95);
    outline-offset: -3px;
    filter: brightness(1.18);
}

.player-queue {
    gap: var(--queue-gap);
}

.player-queue__tile {
    width: calc(var(--cell-size) * var(--queue-tile-scale));
    height: calc(var(--cell-size) * var(--queue-tile-scale));
}

.cell,
.player-queue__tile {
    font-size: calc(clamp(17px, 5vw, 30px) * var(--symbol-scale));
}

@media (max-width: 620px) {
    :root {
        --cell-size: min(
            calc((100vw - 20px - ((var(--board-size) - 1) * var(--board-gap))) / var(--board-size)),
            72px
        );
    }

    .game-shell {
        width: 100%;
    }

    .board-row {
        width: 100%;
    }
}