:root {
    --grid-columns: 1;
    --grid-rows: 1;
    --slot-cols: 1;
    --slot-rows: 1;
    --block-columns: 1;
    --block-rows: 1;
    --radius-cell: 2px;
    --radius-piece: 4px;
    --radius-pill: 999px;
    --radius-btn: 10px;
    --radius-modal: 12px;
    --surface-blur: 14px;
    --focus-ring: rgba(0, 212, 255, 0.9);
    --bg-color: #0a0b1e;
    --bg-image: url("../img/bg.png");
    --neon-magenta: #bf00ff;
    --neon-purple: #8a2be2;
    --neon-amber: #ff8c00;
    --neon-blue: #00d4ff;
    --neon-cyan: #e0ffff;
    --panel-bg: rgba(10, 14, 38, 0.72);
    --panel-bg-hover: rgba(18, 22, 52, 0.82);
    --panel-border: rgba(0, 212, 255, 0.38);
    --panel-border-muted: rgba(138, 43, 226, 0.32);
    --panel-shadow:
        0 8px 32px rgba(0, 0, 0, 0.45),
        0 0 20px rgba(0, 212, 255, 0.06);
    --text-primary: #e8f4ff;
    --text-secondary: rgba(200, 230, 255, 0.62);
    --cell-slot-border: rgba(0, 212, 255, 0.22);
    --board-cell-fill: rgba(0, 212, 255, 0.06);
    --board-line-outer: rgba(0, 212, 255, 0.72);
    --board-line-outer-width: 2.5px;
    --board-corner-radius: 5px;
    --celebration-glow: rgba(255, 174, 66, 0.5);
    --modal-scrim: rgba(10, 11, 30, 0.28);
    --btn-success-text: #faf5ff;
    --btn-success-face-top: #d946ef;
    --btn-success-face-mid: #a855f7;
    --btn-success-face-bottom: #7c3aed;
    --btn-success-border: rgba(233, 213, 255, 0.55);
    --btn-success-edge: #4c1d95;
    --btn-success-edge-active: #3b0764;
    --transition-spring: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    --app-padding-x: 0.75rem;
    --app-padding-top: 0.75rem;
    --header-gap: 0.75rem;
    --header-group-gap: 0.5rem;
    --action-btn-size: 2.85rem;
    --action-icon-size: 1.32rem;
    --level-font-size: 1.35rem;
    --game-stage-gap: 0.9rem;
    --play-again-bar-height: var(--game-btn-min-height);
    --supply-row-gap: 0.45rem;
    --supply-col-gap: 1.65rem;
    --modal-max-width: 22rem;
    --modal-padding: 1.75rem 1.5rem 1.45rem;
    --dialog-level-value-size: 3.25rem;
    --logo-max-width: 14.5rem;
    --trophy-size: 4.5rem;
    --game-btn-min-height: 2.85rem;
    --game-btn-font-size: 0.95rem;
    --dialog-title-size: 1.4rem;
    --dialog-message-size: 0.95rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    --cell-size: attr(data-cell-size type(<length>), 54px);
    margin: 0;
    min-height: 100%;
    background-color: var(--bg-color);
    background-image: var(--bg-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

body {
    margin: 0;
    min-height: 100%;
    background: transparent;
    color: var(--text-primary);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
    font: inherit;
}

.app {
    min-height: 100vh;
    min-height: 100dvh;
    padding:
        max(var(--app-padding-top), env(safe-area-inset-top, 0px))
        max(var(--app-padding-x), env(safe-area-inset-right, 0px))
        max(0px, env(safe-area-inset-bottom, 0px))
        max(var(--app-padding-x), env(safe-area-inset-left, 0px));
    display: flex;
    flex-direction: column;
    align-items: stretch;
    overflow-x: hidden;
    overflow-y: hidden;
    user-select: none;
    touch-action: none;
}

.app-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--header-gap);
    flex-wrap: nowrap;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.header-group {
    display: flex;
    align-items: center;
    gap: var(--header-group-gap);
    min-width: 0;
    flex: 1 1 0;
    flex-wrap: nowrap;
}

.header-group--left {
    justify-content: flex-start;
}

.header-group--right {
    justify-content: flex-end;
}

.level-readout {
    display: inline-flex;
    align-items: baseline;
    gap: 0.45rem;
    color: var(--text-primary);
    line-height: 1;
    white-space: nowrap;
}

.level-readout__label {
    font-size: var(--level-font-size);
    font-weight: 600;
    color: var(--text-secondary);
}

.level-readout__value {
    font-size: var(--level-font-size);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.level-readout--dialog {
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    min-width: 8.5rem;
    margin: 0 auto 1.5rem;
    padding: 1.05rem 1.65rem 1.15rem;
    border-radius: var(--radius-btn);
    background: rgba(10, 14, 38, 0.55);
    border: 1px solid var(--panel-border-muted);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow:
        inset 0 1px 0 rgba(0, 212, 255, 0.12),
        0 0 14px rgba(138, 43, 226, 0.12);
}

.level-readout--dialog .level-readout__label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.level-readout--dialog .level-readout__value {
    font-size: var(--dialog-level-value-size);
    font-weight: 800;
    line-height: 1;
    color: var(--neon-cyan);
    text-shadow: 0 0 12px rgba(0, 212, 255, 0.35);
}

.game-layout {
    width: 100%;
    margin-top: 0;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.game-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--game-stage-gap);
    width: 100%;
    max-width: 100%;
    flex: 0 1 auto;
    min-height: 0;
}

.grid-panel {
    width: 100%;
    flex: 0 0 auto;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.game-stage-bar {
    flex: 0 0 var(--play-again-bar-height);
    width: 100%;
    min-height: var(--play-again-bar-height);
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-stage-bar--hidden {
    visibility: hidden;
    pointer-events: none;
}

.game-stage-bar--hidden .game-button {
    visibility: hidden;
}

.game-stage-bar .game-button {
    width: auto;
    min-width: 10.5rem;
    padding-inline: 1.75rem;
}

.board-stage {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.target-grid {
    --grid-columns: attr(data-cols type(<number>), 1);
    --grid-rows: attr(data-rows type(<number>), 1);
    --grid-width: calc(var(--grid-columns) * var(--cell-size));
    --grid-height: calc(var(--grid-rows) * var(--cell-size));
    position: relative;
    width: var(--grid-width);
    height: var(--grid-height);
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), var(--cell-size));
    grid-template-rows: repeat(var(--grid-rows), var(--cell-size));
    flex: 0 0 auto;
    filter:
        drop-shadow(0 0 10px rgba(255, 255, 255, 0.22))
        drop-shadow(0 0 24px rgba(255, 255, 255, 0.1));
}

.target-cell {
    width: var(--cell-size);
    height: var(--cell-size);
}

.target-cell--active {
    background: var(--board-cell-fill);
    border-top: 1px solid var(--cell-slot-border);
    border-left: 1px solid var(--cell-slot-border);
    transition: border-color 0.2s ease;
}

.target-cell--active.target-cell--edge-top {
    border-top-width: var(--board-line-outer-width);
    border-top-color: var(--board-line-outer);
}

.target-cell--active.target-cell--edge-left {
    border-left-width: var(--board-line-outer-width);
    border-left-color: var(--board-line-outer);
}

.target-cell--active.target-cell--edge-right {
    border-right: var(--board-line-outer-width) solid var(--board-line-outer);
}

.target-cell--active.target-cell--edge-bottom {
    border-bottom: var(--board-line-outer-width) solid var(--board-line-outer);
}

.target-cell--active.target-cell--corner-tl {
    border-top-left-radius: var(--board-corner-radius);
}

.target-cell--active.target-cell--corner-tr {
    border-top-right-radius: var(--board-corner-radius);
}

.target-cell--active.target-cell--corner-bl {
    border-bottom-left-radius: var(--board-corner-radius);
}

.target-cell--active.target-cell--corner-br {
    border-bottom-right-radius: var(--board-corner-radius);
}

.target-cell--covered {
    background: transparent;
    border-color: transparent !important;
}

.target-cell--inactive {
    visibility: hidden;
    pointer-events: none;
}

.supply-panel {
    width: 100%;
    flex: 0 0 auto;
    padding: 0 0.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
}

.action-button,
.game-button {
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition:
        transform 0.18s ease,
        background-color 0.18s ease,
        border-color 0.18s ease,
        color 0.18s ease,
        box-shadow 0.18s ease;
}

.action-button--icon {
    width: var(--action-btn-size);
    height: var(--action-btn-size);
    padding: 0;
    flex: 0 0 auto;
}

.action-button__icon {
    width: var(--action-icon-size);
    height: var(--action-icon-size);
    display: block;
    flex: 0 0 auto;
    pointer-events: none;
}

.action-button__icon--muted {
    display: none;
}

.action-button--sound-off .action-button__icon--on {
    display: none;
}

.action-button--sound-off .action-button__icon--muted {
    display: block;
}

.action-button:hover,
.game-button:hover {
    transform: translateY(-1px);
}

.action-button:active,
.game-button:active {
    transform: scale(0.97);
}

.action-button:focus-visible,
.game-button:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

.action-button--neutral {
    color: var(--text-primary);
    background: var(--panel-bg);
    border-color: var(--panel-border);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    box-shadow: var(--panel-shadow);
}

.action-button--neutral:hover {
    background: var(--panel-bg-hover);
}

.supply-tray {
    display: flex;
    flex: 0 1 auto;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    align-content: flex-start;
    width: 100%;
    max-height: 100%;
    min-height: 0;
    padding: 0;
    overflow-x: hidden;
    overflow-y: auto;
    touch-action: pan-y;
    row-gap: var(--supply-row-gap);
    column-gap: var(--supply-col-gap);
}

.block-slot {
    --slot-cols: attr(data-cols type(<number>), 1);
    --slot-rows: attr(data-rows type(<number>), 1);
    position: relative;
    width: calc(var(--slot-cols) * var(--cell-size));
    height: calc(var(--slot-rows) * var(--cell-size));
    flex: 0 0 auto;
}

.block {
    --block-columns: attr(data-cols type(<number>), 1);
    --block-rows: attr(data-rows type(<number>), 1);
    --block-color: #1ed4e9;
    position: absolute;
    left: attr(data-block-x type(<length>), 0px);
    top: attr(data-block-y type(<length>), 0px);
    display: grid;
    grid-template-columns: repeat(var(--block-columns), var(--cell-size));
    grid-template-rows: repeat(var(--block-rows), var(--cell-size));
    touch-action: none;
    cursor: grab;
    filter: drop-shadow(0 8px 12px rgba(0, 0, 0, 0.4));
    transition: transform 0.1s ease;
}

.block[data-color="0"] { --block-color: #1ed4e9; }
.block[data-color="1"] { --block-color: #2979ff; }
.block[data-color="2"] { --block-color: #ff00c8; }
.block[data-color="3"] { --block-color: #19d725; }
.block[data-color="4"] { --block-color: #ffea00; }
.block[data-color="5"] { --block-color: #ff6d00; }
.block[data-color="6"] { --block-color: #8c11d3; }
.block[data-color="7"] { --block-color: #e78e71; }

.block--floating {
    position: fixed;
    z-index: 100;
}

.block--placed {
    z-index: 10;
    cursor: default;
    transform: none;
}

.block:active,
.block--floating {
    cursor: grabbing;
    transform: scale(1.05) translateY(-4px);
    filter: drop-shadow(0 12px 20px rgba(0, 0, 0, 0.6));
}

.block-animating {
    transition:
        left var(--transition-spring),
        top var(--transition-spring),
        transform 0.3s ease;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    padding: 1px;
}

.cell--empty {
    visibility: hidden;
    pointer-events: none;
}

.cell-inner {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-piece);
    background: var(--block-color);
    box-shadow:
        inset 0 2px 0 rgba(255, 255, 255, 0.3),
        inset 0 -2px 0 rgba(0, 0, 0, 0.3),
        0 1px 2px rgba(0, 0, 0, 0.5);
}

.modal {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background-color: var(--bg-color);
    background-image: var(--bg-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 0.15s ease, visibility 0.15s ease;
}

.modal--overlay {
    --modal-blur: 4px;
    background-image: linear-gradient(var(--modal-scrim), var(--modal-scrim)), var(--bg-image);
    backdrop-filter: blur(var(--modal-blur));
    -webkit-backdrop-filter: blur(var(--modal-blur));
}

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

.modal-dialog {
    position: relative;
    width: min(100%, var(--modal-max-width));
    padding: var(--modal-padding);
    border-radius: var(--radius-modal);
    text-align: center;
    background: linear-gradient(
        180deg,
        rgba(14, 18, 48, 0.82) 0%,
        rgba(10, 12, 34, 0.78) 100%
    );
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(var(--surface-blur));
    -webkit-backdrop-filter: blur(var(--surface-blur));
    box-shadow:
        var(--panel-shadow),
        inset 0 1px 0 rgba(0, 212, 255, 0.1),
        0 0 28px rgba(138, 43, 226, 0.1);
    transform: scale(1);
    transition: transform 0.15s ease;
    overflow: hidden;
}

.modal-dialog::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(
        90deg,
        var(--neon-magenta) 0%,
        var(--neon-purple) 28%,
        var(--neon-blue) 55%,
        var(--neon-amber) 100%
    );
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.35);
}

.modal-dialog--enter {
    transform: scale(0.95);
}

.game-dialog__title {
    margin: 0 0 1.15rem;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: 1.25;
    color: var(--text-primary);
}

.game-dialog__logo {
    margin: 0 0 1.35rem;
    line-height: 0;
}

.game-logo {
    display: block;
    width: min(100%, var(--logo-max-width));
    height: auto;
    margin-inline: auto;
}

.game-dialog__title--compact {
    margin-bottom: 0.4rem;
    font-size: var(--dialog-title-size);
    font-weight: 800;
    color: var(--neon-cyan);
    text-shadow: 0 0 14px rgba(0, 212, 255, 0.28);
}

.game-dialog__message {
    margin: 0 0 1.35rem;
    color: var(--text-secondary);
    font-size: var(--dialog-message-size);
    font-weight: 500;
    line-height: 1.45;
}

.how-to-play__steps {
    margin: 0 0 1.25rem;
    padding-left: 1.15rem;
    text-align: left;
    color: var(--text-secondary);
    font-size: var(--dialog-message-size);
    font-weight: 500;
    line-height: 1.5;
}

.how-to-play__steps li + li {
    margin-top: 0.55rem;
}

.how-to-play__steps strong {
    color: var(--neon-cyan);
    font-weight: 600;
}

.game-dialog--win .modal-trophy {
    margin-bottom: 0.5rem;
}

.modal-actions {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 0.5rem;
}

.modal-actions .game-button--neutral {
    flex: 0 1 38%;
}

.modal-actions .game-button--success {
    flex: 1 1 62%;
}

.modal-trophy {
    display: block;
    margin: 0.15rem auto 0.35rem;
    font-size: var(--trophy-size);
    line-height: 1;
    filter: drop-shadow(0 8px 18px var(--celebration-glow));
    animation: trophy-pop 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes trophy-pop {
    0% {
        transform: scale(0.4) translateY(12px);
        opacity: 0;
    }
    100% {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.game-button {
    width: 100%;
    min-height: var(--game-btn-min-height);
    padding: 0.7rem 0.85rem;
    font-size: var(--game-btn-font-size);
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    cursor: pointer;
}

.game-button--success {
    color: var(--btn-success-text);
    background: linear-gradient(
        180deg,
        var(--btn-success-face-top) 0%,
        var(--btn-success-face-mid) 48%,
        var(--btn-success-face-bottom) 100%
    );
    border-color: var(--btn-success-border);
    text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.28),
        0 4px 0 var(--btn-success-edge),
        0 6px 14px rgba(0, 0, 0, 0.34);
}

.game-button--success:hover {
    background: linear-gradient(
        180deg,
        #e879f9 0%,
        #c026d3 48%,
        #9333ea 100%
    );
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.34),
        0 4px 0 var(--btn-success-edge),
        0 8px 18px rgba(76, 29, 149, 0.42);
}

.game-button--success:active {
    transform: translateY(3px);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.14),
        0 1px 0 var(--btn-success-edge-active),
        0 3px 8px rgba(0, 0, 0, 0.28);
}

.game-button--neutral {
    color: var(--text-primary);
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.14) 0%, rgba(100, 116, 139, 0.1) 100%);
    border-color: rgba(255, 255, 255, 0.14);
    box-shadow:
        0 3px 0 rgba(30, 41, 59, 0.5),
        var(--panel-shadow);
}

.game-button--neutral:hover {
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.22) 0%, rgba(100, 116, 139, 0.16) 100%);
}

.game-button--neutral:active {
    transform: translateY(2px);
    box-shadow:
        0 1px 0 rgba(30, 41, 59, 0.5),
        var(--panel-shadow);
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 212, 255, 0.25);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(191, 0, 255, 0.35);
}

@keyframes pop {
    0% {
        transform: scale(1);
        filter: brightness(1);
    }
    50% {
        transform: scale(1.05);
        filter: brightness(1.5);
    }
    100% {
        transform: scale(1);
        filter: brightness(1);
    }
}

.level-complete-anim {
    animation: pop 0.6s ease;
}

/* Tablet landscape (769px – 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --app-padding-x: 0.65rem;
        --app-padding-top: 0.65rem;
        --header-gap: 0.6rem;
        --header-group-gap: 0.45rem;
        --action-btn-size: 2.7rem;
        --action-icon-size: 1.26rem;
        --level-font-size: 1.2rem;
        --game-stage-gap: 1.4rem;
        --supply-row-gap: 0.4rem;
        --supply-col-gap: 1.35rem;
        --modal-max-width: 21rem;
        --modal-padding: 1.6rem 1.35rem 1.3rem;
        --dialog-level-value-size: 2.85rem;
        --logo-max-width: 13rem;
        --trophy-size: 4rem;
        --game-btn-min-height: 2.7rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --game-btn-font-size: 0.92rem;
        --dialog-title-size: 1.3rem;
        --dialog-message-size: 0.9rem;
        --board-line-outer-width: 2.25px;
        --board-corner-radius: 4px;
    }

    .level-readout--dialog {
        min-width: 7.5rem;
        margin-bottom: 1.25rem;
        padding: 0.9rem 1.35rem 1rem;
    }
}

/* Tablet portrait (641px – 768px) */
@media (min-width: 641px) and (max-width: 768px) {
    :root {
        --app-padding-x: 0.55rem;
        --app-padding-top: 0.55rem;
        --header-gap: 0.5rem;
        --header-group-gap: 0.4rem;
        --action-btn-size: 2.55rem;
        --action-icon-size: 1.2rem;
        --level-font-size: 1.1rem;
        --game-stage-gap: 1.5rem;
        --supply-row-gap: 0.38rem;
        --supply-col-gap: 1.15rem;
        --modal-max-width: 20rem;
        --modal-padding: 1.45rem 1.2rem 1.2rem;
        --dialog-level-value-size: 2.65rem;
        --logo-max-width: 12rem;
        --trophy-size: 3.75rem;
        --game-btn-min-height: 2.6rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --game-btn-font-size: 0.9rem;
        --dialog-title-size: 1.22rem;
        --dialog-message-size: 0.88rem;
        --board-line-outer-width: 2px;
        --board-corner-radius: 4px;
    }

    .level-readout--dialog {
        min-width: 7rem;
        margin-bottom: 1.15rem;
        padding: 0.85rem 1.2rem 0.95rem;
    }

    .level-readout--dialog .level-readout__label {
        font-size: 0.7rem;
    }
}

/* Mobile (≤640px) */
@media (max-width: 640px) {
    :root {
        --app-padding-x: 0.45rem;
        --app-padding-top: 0.5rem;
        --header-gap: 0.4rem;
        --header-group-gap: 0.32rem;
        --action-btn-size: 2.45rem;
        --action-icon-size: 1.12rem;
        --level-font-size: 1rem;
        --game-stage-gap: 1.35rem;
        --supply-row-gap: 0.32rem;
        --supply-col-gap: 0.95rem;
        --modal-max-width: 18.5rem;
        --modal-padding: 1.35rem 1.1rem 1.1rem;
        --dialog-level-value-size: 2.45rem;
        --logo-max-width: 11rem;
        --trophy-size: 3.35rem;
        --game-btn-min-height: 2.5rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --game-btn-font-size: 0.86rem;
        --dialog-title-size: 1.15rem;
        --dialog-message-size: 0.85rem;
        --board-line-outer-width: 2px;
        --board-corner-radius: 3px;
    }

    .supply-tray {
        padding-top: 0.2rem;
    }

    .modal {
        padding: 0.75rem;
    }

    .level-readout--dialog {
        min-width: 6.5rem;
        margin-bottom: 1rem;
        padding: 0.75rem 1rem 0.85rem;
    }

    .level-readout--dialog .level-readout__label {
        font-size: 0.68rem;
        letter-spacing: 0.14em;
    }

    .game-dialog__logo {
        margin-bottom: 1rem;
    }

    .modal-actions {
        gap: 0.4rem;
    }
}

/* Small mobile (≤480px) */
@media (max-width: 480px) {
    :root {
        --app-padding-x: 0.35rem;
        --app-padding-top: 0.4rem;
        --header-gap: 0.32rem;
        --header-group-gap: 0.25rem;
        --action-btn-size: 2.2rem;
        --action-icon-size: 1rem;
        --level-font-size: 0.88rem;
        --game-stage-gap: 1.2rem;
        --supply-row-gap: 0.28rem;
        --supply-col-gap: 0.7rem;
        --modal-max-width: calc(100% - 1.25rem);
        --modal-padding: 1.15rem 0.95rem 0.95rem;
        --dialog-level-value-size: 2.1rem;
        --logo-max-width: 9.5rem;
        --trophy-size: 2.85rem;
        --game-btn-min-height: 2.35rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --game-btn-font-size: 0.8rem;
        --dialog-title-size: 1.05rem;
        --dialog-message-size: 0.8rem;
        --board-line-outer-width: 1.75px;
        --board-corner-radius: 3px;
    }

    .level-readout {
        gap: 0.3rem;
    }

    .level-readout--dialog {
        min-width: 5.75rem;
        margin-bottom: 0.85rem;
        padding: 0.65rem 0.85rem 0.75rem;
        border-width: 1px;
    }

    .level-readout--dialog .level-readout__label {
        font-size: 0.62rem;
        letter-spacing: 0.12em;
    }

    .how-to-play__steps {
        padding-left: 1rem;
        line-height: 1.45;
    }

    .how-to-play__steps li + li {
        margin-top: 0.45rem;
    }

    .game-button {
        padding: 0.6rem 0.7rem;
        letter-spacing: 0.02em;
    }
}

/* Landscape mobile — side-by-side board + tray */
@media (orientation: landscape) and (max-height: 500px) {
    :root {
        --app-padding-x: 0.4rem;
        --app-padding-top: 0.3rem;
        --header-gap: 0.35rem;
        --header-group-gap: 0.28rem;
        --action-btn-size: 2.15rem;
        --action-icon-size: 0.98rem;
        --level-font-size: 0.82rem;
        --game-stage-gap: 0.7rem;
        --supply-row-gap: 0.24rem;
        --supply-col-gap: 0.55rem;
        --modal-max-width: 17.5rem;
        --modal-padding: 1rem 0.9rem 0.85rem;
        --dialog-level-value-size: 1.85rem;
        --logo-max-width: 8.5rem;
        --trophy-size: 2.5rem;
        --game-btn-min-height: 2.2rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --game-btn-font-size: 0.78rem;
        --dialog-title-size: 1rem;
        --dialog-message-size: 0.78rem;
    }

    .app {
        padding-bottom: max(0.2rem, env(safe-area-inset-bottom, 0px));
    }

    .game-stage {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: center;
        max-width: 100%;
    }

    .game-stage-bar {
        flex: 1 1 100%;
        order: -1;
        max-width: 100%;
    }

    .grid-panel {
        flex: 1 1 56%;
        max-width: 58%;
        min-width: 0;
        justify-content: center;
    }

    .board-stage {
        width: 100%;
        justify-content: center;
    }

    .supply-panel {
        flex: 1 1 44%;
        max-width: 44%;
        min-width: 0;
        padding-inline: 0.1rem;
    }

    .level-readout--dialog {
        min-width: 5rem;
        margin-bottom: 0.65rem;
        padding: 0.55rem 0.75rem 0.65rem;
    }

    .level-readout--dialog .level-readout__value {
        font-size: 1.65rem;
    }

    .game-dialog__logo {
        margin-bottom: 0.65rem;
    }

    .modal {
        padding: 0.5rem;
    }

    .modal-actions {
        flex-direction: row;
    }
}

/* Desktop (≥1025px) — explicit large-screen tuning */
@media (min-width: 1025px) {
    :root {
        --app-padding-x: 0.85rem;
        --game-stage-gap: 1.2rem;
        --play-again-bar-height: var(--game-btn-min-height);
        --supply-row-gap: 0.45rem;
        --supply-col-gap: 1.75rem;
    }

    .game-stage {
        max-width: 56rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}