:root {
    --font: 'Nunito', system-ui, sans-serif;

    /* Green / orange game core */
    --wood: #c4a574;
    --orange: #ff9f2e;
    --orange-bright: #ffbe5c;
    --orange-deep: #e07b0a;
    --green: #2ecc71;
    --green-bright: #5fe09a;
    --green-deep: #1fa85a;
    --green-shadow: #178f4a;
    --green-glow: rgba(46, 204, 113, 0.45);

    /* Surfaces */
    --surface: #fffef8;
    --board-mat: #e8e8e8;
    --overlay: rgba(28, 38, 24, 0.55);

    /* Ink */
    --text: #2a3d28;
    --text-muted: #5a6e56;

    --border: #ffffff;

    --board-gap: 2px;
    --bar-h: 3rem;
    --pad: 0.875rem;
    --bar-gap: 0.5rem;
    --icon-radius: 14px;
    --board-radius: 14px;
    --border-w: 3px;
    --card-border: 5px;
    --modal-pad: 1.25rem;
    --card-max: 18rem;
    --card-start-max: 20rem;
    --card-compact-max: 13rem;
    --logo-max-w: clamp(10.5rem, 78vw, 17rem);
    --level-card-size: clamp(4.75rem, 20vw, 6rem);
    --btn-font: 1.0625rem;
    --title-font: 1.75rem;
    --tag-font: 0.8125rem;
    --icon-font: 0.9375rem;
    --timer-min: 5.5rem;
    --layout-v-offset: calc(var(--bar-h) + 3 * var(--pad));
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-snap: cubic-bezier(0.34, 1.4, 0.64, 1);
    --shadow-soft: 0 8px 24px rgba(30, 50, 28, 0.2);
    --shadow-card: 0 16px 40px rgba(30, 50, 28, 0.28);
    --shadow-btn: 0 6px 0 var(--green-shadow);
    --shadow-icon-orange: 0 4px 0 var(--orange-deep);
    --shadow-icon-green: 0 4px 0 var(--green-shadow);
    --z-confetti: 1500;
    --z-modal: 2000;

    /* Runtime tokens (set on .board / .piece via Styles module) */
    --cols: 2;
    --rows: 2;
    --art-url: none;
    --orig-c: 0;
    --orig-r: 0;
    --curr-c: 0;
    --curr-r: 0;
    --tile-bg-x: 0px;
    --tile-bg-y: 0px;
    --tile-bg-w: 0px;
    --tile-bg-h: 0px;
    --drag-x: 0px;
    --drag-y: 0px;
}

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

body {
    margin: 0;
    overflow: hidden;
    font-family: var(--font);
    color: var(--text);
    background-color: var(--wood);
    background-image: url('../img/bg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
}

#game-wrapper {
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: var(--pad);
    padding:
        max(var(--pad), env(safe-area-inset-top))
        max(var(--pad), env(safe-area-inset-right))
        max(var(--pad), env(safe-area-inset-bottom))
        max(var(--pad), env(safe-area-inset-left));
}

.is-hidden {
    display: none !important;
}

/* ── Top bar ─────────────────────────────────────────────────────────────── */

.bar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: var(--bar-h);
}

.bar__left,
.bar__right {
    display: flex;
    align-items: center;
    gap: var(--bar-gap);
}

.bar__left {
    justify-self: start;
}

.bar__center {
    display: flex;
    align-items: center;
    justify-content: center;
    justify-self: center;
}

.bar__right {
    justify-self: end;
}

.icon-btn {
    width: var(--bar-h);
    height: var(--bar-h);
    display: flex;
    align-items: center;
    justify-content: center;
    border: var(--border-w) solid var(--border);
    border-radius: var(--icon-radius);
    color: #ffffff;
    font-size: var(--icon-font);
    cursor: pointer;
    transition: transform 0.12s, box-shadow 0.12s, background 0.12s;
}

.bar__left .icon-btn {
    background: var(--orange);
    box-shadow: var(--shadow-icon-orange), var(--shadow-soft);
}

.bar__left .icon-btn:hover {
    background: var(--orange-bright);
    transform: translateY(-2px);
}

.bar__left .icon-btn:active {
    transform: translateY(3px);
    background: var(--orange-deep);
    box-shadow: 0 1px 0 var(--orange-deep);
}

.bar__right .icon-btn {
    background: var(--green);
    box-shadow: var(--shadow-icon-green), var(--shadow-soft);
}

.bar__right .icon-btn:hover {
    background: var(--green-bright);
    transform: translateY(-2px);
}

.bar__right .icon-btn:active {
    transform: translateY(3px);
    background: var(--green-deep);
    box-shadow: 0 1px 0 var(--green-shadow);
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    height: var(--bar-h);
    padding: 0 0.875rem;
    border: var(--border-w) solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-size: var(--tag-font);
    font-weight: 800;
    color: var(--text);
    box-shadow: 0 4px 0 rgba(224, 123, 10, 0.2), var(--shadow-soft);
}

.tag strong {
    color: var(--orange-deep);
    font-weight: 800;
}

.tag--time {
    font-variant-numeric: tabular-nums;
    font-weight: 800;
    color: var(--green-deep);
    min-width: var(--timer-min);
    justify-content: center;
    gap: 0.375rem;
    padding: 0 1rem;
}

.tag__icon {
    font-size: 0.875rem;
    color: var(--orange-deep);
}

/* ── Board ───────────────────────────────────────────────────────────────── */

.stage {
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.board-frame {
    --cell: min(
        calc((100vw - 2 * var(--pad) - env(safe-area-inset-left) - env(safe-area-inset-right)) / var(--cols)),
        calc((100dvh - var(--layout-v-offset) - env(safe-area-inset-top) - env(safe-area-inset-bottom)) / var(--rows))
    );
    width: calc(var(--cell) * var(--cols));
    height: calc(var(--cell) * var(--rows));
    flex-shrink: 0;
    border-radius: var(--board-radius);
    border: var(--border-w) solid var(--border);
    overflow: hidden;
    box-shadow: 0 10px 32px rgba(20, 30, 18, 0.28);
}

.board {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--board-mat);
    touch-action: none;
}

.board.is-drag-active {
    cursor: grabbing;
}

.board__peek {
    position: absolute;
    inset: 0;
    background-image: var(--art-url);
    background-size: 100% 100%;
    opacity: 0;
    transition: opacity 0.35s var(--ease);
    z-index: 5;
    pointer-events: none;
    border-radius: inherit;
}

.board__peek.is-active {
    opacity: 1;
}

/* ── Pieces ──────────────────────────────────────────────────────────────── */

.piece {
    position: absolute;
    width: calc(100% / var(--cols));
    height: calc(100% / var(--rows));
    left: calc(100% * var(--curr-c) / var(--cols));
    top: calc(100% * var(--curr-r) / var(--rows));
    background-image: var(--art-url);
    background-size: var(--tile-bg-w) var(--tile-bg-h);
    background-position: var(--tile-bg-x) var(--tile-bg-y);
    border: var(--board-gap) solid var(--board-mat);
    box-sizing: border-box;
    cursor: pointer;
    transform: translate(var(--drag-x), var(--drag-y));
    transition:
        left 0.32s var(--ease),
        top 0.32s var(--ease),
        outline 0.15s ease,
        filter 0.15s ease;
    will-change: left, top;
    z-index: 1;
    touch-action: none;
}

.piece.is-passthrough {
    pointer-events: none;
}

.piece.is-dragging,
.piece.is-selected {
    outline: 2px solid var(--orange);
    outline-offset: -1px;
}

.piece.is-dragging {
    z-index: 200;
    cursor: grabbing;
    transition: outline 0.15s ease;
}

.piece.is-drop-zone {
    outline: 2px solid var(--green);
    outline-offset: -1px;
    z-index: 40;
}

.piece:hover:not(.is-selected) {
    filter: brightness(1.03);
    z-index: 10;
}

.piece.is-selected {
    z-index: 30;
}

.piece.is-linked-n { border-top-color: transparent; }
.piece.is-linked-s { border-bottom-color: transparent; }
.piece.is-linked-e { border-right-color: transparent; }
.piece.is-linked-w { border-left-color: transparent; }

/* ── Effects ─────────────────────────────────────────────────────────────── */

#confetti-canvas {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-confetti);
}

/* ── Modals ──────────────────────────────────────────────────────────────── */

.modal-backdrop {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--modal-pad);
    background: var(--overlay);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.modal-backdrop.is-entering .card {
    animation: card-in 0.4s var(--ease-snap) forwards;
}

@keyframes card-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
}

.card {
    width: 100%;
    max-width: var(--card-max);
    padding: 1.75rem 1.5rem;
    border-radius: 26px;
    background: var(--surface);
    border: var(--card-border) solid var(--orange);
    box-shadow:
        0 0 0 3px var(--border),
        0 8px 0 var(--green-deep),
        var(--shadow-card);
    text-align: center;
}

.card--compact {
    max-width: var(--card-compact-max);
    padding: 1.5rem;
}

.card--start,
.card--victory {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.card--start {
    max-width: var(--card-start-max);
}

.card__logo {
    display: block;
    width: min(100%, var(--logo-max-w));
    max-width: 100%;
    height: auto;
    aspect-ratio: 873 / 304;
    object-fit: contain;
    margin: 0 auto 0.125rem;
}

.level-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.125rem;
    width: var(--level-card-size);
    height: var(--level-card-size);
    margin: 0.125rem 0 0.375rem;
    padding: 0.5rem;
    border-radius: 18px;
    background: linear-gradient(180deg, #ffffff 0%, #f8f6ee 100%);
    border: var(--card-border) solid var(--green);
    box-shadow:
        0 0 0 2px var(--border),
        0 5px 0 var(--green-shadow),
        0 10px 20px rgba(30, 50, 28, 0.14);
}

.level-card__label {
    margin: 0;
    font-size: 0.625rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    line-height: 1;
}

.level-card__num {
    margin: 0;
    font-size: clamp(1.75rem, 8vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1;
    color: var(--orange-deep);
}

.card__title {
    margin: 0;
    font-size: var(--title-font);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    color: var(--text);
}

.card__title span {
    color: var(--orange-deep);
}

.card__meta {
    margin: 0 0 1rem;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--text-muted);
}

.card__body,
.card__text {
    margin: 0;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
    line-height: 1.5;
}

.card__body {
    margin-bottom: 0.875rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.9375rem 1.5rem;
    border: var(--card-border) solid var(--border);
    border-radius: 999px;
    font-family: inherit;
    font-size: var(--btn-font);
    font-weight: 800;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: transform 0.12s, box-shadow 0.12s, background 0.12s;
}

.btn--primary {
    background: var(--green);
    color: #ffffff;
    text-shadow: 0 1px 0 rgba(23, 143, 74, 0.55);
    box-shadow: var(--shadow-btn), 0 10px 28px var(--green-glow);
}

.btn--primary:hover {
    background: var(--green-bright);
    transform: translateY(-2px);
    box-shadow: 0 8px 0 var(--green-shadow), 0 14px 32px var(--green-glow);
}

.btn--primary:active {
    transform: translateY(4px);
    background: var(--green-deep);
    box-shadow: 0 2px 0 var(--green-shadow);
}

.spinner {
    width: 1.75rem;
    height: 1.75rem;
    border: 3px solid rgba(255, 159, 46, 0.25);
    border-top-color: var(--green);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Responsive breakpoints
   Desktop (≥1025px)     → :root defaults above
   Tablet Landscape      → 769px – 1024px
   Tablet Portrait       → 641px – 768px
   Mobile                → ≤640px
   Small Mobile          → ≤480px
   Landscape Mobile      → orientation: landscape (short viewports)
   ═══════════════════════════════════════════════════════════════════════════ */

/* Tablet Landscape (769px – 1024px) */
@media (max-width: 1024px) {
    :root {
        --bar-h: 2.75rem;
        --pad: 0.75rem;
        --bar-gap: 0.4375rem;
        --icon-radius: 13px;
        --board-radius: 13px;
        --border-w: 3px;
        --card-border: 4px;
        --modal-pad: 1.125rem;
        --card-max: 17rem;
        --card-start-max: 18.5rem;
        --card-compact-max: 12.5rem;
        --logo-max-w: clamp(10rem, 74vw, 16rem);
        --level-card-size: clamp(4.5rem, 19vw, 5.75rem);
        --btn-font: 1rem;
        --title-font: 1.625rem;
        --tag-font: 0.78125rem;
        --icon-font: 0.875rem;
        --timer-min: 5.25rem;
    }

    .card {
        padding: 1.625rem 1.375rem;
    }

    .card--compact {
        padding: 1.375rem;
    }

    .btn {
        padding: 0.875rem 1.375rem;
    }
}

/* Tablet Portrait (641px – 768px) */
@media (max-width: 768px) {
    :root {
        --bar-h: 2.5rem;
        --pad: 0.625rem;
        --bar-gap: 0.375rem;
        --icon-radius: 12px;
        --board-radius: 12px;
        --border-w: 2.5px;
        --card-border: 4px;
        --modal-pad: 1rem;
        --card-max: 16rem;
        --card-start-max: 17.5rem;
        --card-compact-max: 12rem;
        --logo-max-w: clamp(9.5rem, 72vw, 15rem);
        --level-card-size: clamp(4.375rem, 18vw, 5.5rem);
        --btn-font: 0.96875rem;
        --title-font: 1.5rem;
        --tag-font: 0.75rem;
        --icon-font: 0.8125rem;
        --timer-min: 5rem;
    }

    .tag {
        padding: 0 0.75rem;
    }

    .tag--time {
        padding: 0 0.875rem;
        gap: 0.3125rem;
    }

    .tag__icon {
        font-size: 0.8125rem;
    }

    .card {
        padding: 1.5rem 1.25rem;
        border-radius: 22px;
    }

    .card--compact {
        padding: 1.25rem;
    }

    .card__logo {
        margin-bottom: 0;
    }

    .card__meta,
    .card__body,
    .card__text {
        font-size: 0.75rem;
    }

    .btn {
        padding: 0.8125rem 1.25rem;
    }

    .spinner {
        width: 1.625rem;
        height: 1.625rem;
    }
}

/* Mobile (≤640px) */
@media (max-width: 640px) {
    :root {
        --bar-h: 2.375rem;
        --pad: 0.5rem;
        --bar-gap: 0.3125rem;
        --icon-radius: 11px;
        --board-radius: 11px;
        --border-w: 2px;
        --card-border: 3px;
        --modal-pad: 0.875rem;
        --card-max: 15rem;
        --card-start-max: 16.5rem;
        --card-compact-max: 11rem;
        --logo-max-w: clamp(9rem, 70vw, 14rem);
        --level-card-size: clamp(4.25rem, 17vw, 5.25rem);
        --btn-font: 0.9375rem;
        --title-font: 1.375rem;
        --tag-font: 0.6875rem;
        --icon-font: 0.75rem;
        --timer-min: 4.5rem;
    }

    .bar {
        grid-template-columns: 1fr auto 1fr;
        column-gap: 0.25rem;
    }

    .tag {
        padding: 0 0.5625rem;
        gap: 0.1875rem;
    }

    .tag--time {
        padding: 0 0.625rem;
        gap: 0.25rem;
    }

    .tag__icon {
        font-size: 0.75rem;
    }

    .card {
        padding: 1.375rem 1.125rem;
        border-radius: 20px;
    }

    .card--start,
    .card--victory {
        gap: 0.4375rem;
    }

    .level-card {
        border-radius: 16px;
        margin-bottom: 0.3125rem;
    }

    .card--compact {
        padding: 1.125rem;
    }

    .card__logo {
        margin-bottom: 0;
    }

    .card__meta {
        margin-bottom: 0.75rem;
    }

    .card__body {
        margin-bottom: 0.75rem;
    }

    .btn {
        padding: 0.75rem 1.125rem;
    }

    .board-frame {
        box-shadow: 0 8px 24px rgba(20, 30, 18, 0.24);
    }

    .icon-btn:hover,
    .btn--primary:hover {
        transform: none;
    }
}

/* Small Mobile (≤480px) */
@media (max-width: 480px) {
    :root {
        --bar-h: 2.125rem;
        --pad: 0.375rem;
        --bar-gap: 0.25rem;
        --icon-radius: 10px;
        --board-radius: 10px;
        --border-w: 2px;
        --card-border: 3px;
        --modal-pad: 0.75rem;
        --card-max: 14rem;
        --card-start-max: 15.5rem;
        --card-compact-max: 10rem;
        --logo-max-w: clamp(8.25rem, 68vw, 13rem);
        --level-card-size: clamp(4rem, 16vw, 5rem);
        --btn-font: 0.875rem;
        --title-font: 1.25rem;
        --tag-font: 0.625rem;
        --icon-font: 0.6875rem;
        --timer-min: 4rem;
    }

    .tag {
        padding: 0 0.4375rem;
    }

    .tag--time {
        padding: 0 0.5rem;
        min-width: var(--timer-min);
    }

    .card {
        padding: 1.25rem 1rem;
        border-radius: 18px;
    }

    .card--compact {
        padding: 1rem;
    }

    .card__meta,
    .card__body,
    .card__text {
        font-size: 0.6875rem;
        line-height: 1.45;
    }

    .btn {
        padding: 0.6875rem 1rem;
        gap: 0.375rem;
    }

    .spinner {
        width: 1.5rem;
        height: 1.5rem;
        border-width: 2.5px;
    }

    .piece.is-dragging,
    .piece.is-selected,
    .piece.is-drop-zone {
        outline-width: 1.5px;
    }
}

/* Landscape Mobile — phones held sideways (short viewport height) */
@media (orientation: landscape) and (max-height: 500px) and (max-width: 900px) {
    :root {
        --bar-h: 1.875rem;
        --pad: 0.3125rem;
        --bar-gap: 0.1875rem;
        --icon-radius: 9px;
        --board-radius: 9px;
        --border-w: 2px;
        --card-border: 3px;
        --modal-pad: 0.625rem;
        --card-max: 13.5rem;
        --card-start-max: 14.5rem;
        --card-compact-max: 9.5rem;
        --logo-max-w: clamp(7.5rem, 42vh, 12rem);
        --level-card-size: clamp(3.75rem, 14vh, 4.5rem);
        --btn-font: 0.8125rem;
        --title-font: 1.125rem;
        --tag-font: 0.5625rem;
        --icon-font: 0.625rem;
        --timer-min: 3.75rem;
    }

    #game-wrapper {
        gap: 0.25rem;
    }

    .bar {
        column-gap: 0.125rem;
    }

    .tag {
        padding: 0 0.375rem;
    }

    .tag--time {
        padding: 0 0.4375rem;
        gap: 0.1875rem;
    }

    .tag__icon {
        font-size: 0.625rem;
    }

    .card {
        padding: 1rem 0.875rem;
        border-radius: 16px;
    }

    .card--start,
    .card--victory {
        gap: 0.3125rem;
    }

    .level-card {
        border-radius: 14px;
        margin-bottom: 0.25rem;
        padding: 0.375rem;
    }

    .level-card__label {
        font-size: 0.5rem;
    }

    .card--compact {
        padding: 0.875rem;
    }

    .card__logo {
        margin-bottom: 0;
    }

    .card__meta {
        margin-bottom: 0.5rem;
    }

    .card__meta,
    .card__body,
    .card__text {
        font-size: 0.625rem;
    }

    .card__body {
        margin-bottom: 0.5rem;
    }

    .btn {
        padding: 0.5625rem 0.875rem;
    }

    .modal-backdrop {
        align-items: center;
        padding: var(--modal-pad);
    }

    .board-frame {
        box-shadow: 0 6px 20px rgba(20, 30, 18, 0.22);
    }
}

/* Desktop enhancements (≥1025px) */
@media (min-width: 1025px) {
    .board-frame {
        box-shadow: 0 12px 40px rgba(20, 30, 18, 0.3);
    }

    .card {
        padding: 2rem 1.75rem;
    }

    .card--compact {
        padding: 1.625rem;
    }
}

/* Very large screens */
@media (min-width: 1440px) {
    :root {
        --bar-h: 3.25rem;
        --pad: 1rem;
        --title-font: 2rem;
        --card-max: 20rem;
        --card-start-max: 22rem;
        --logo-max-w: 19rem;
        --level-card-size: 6.5rem;
        --btn-font: 1.125rem;
    }
}

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