:root {
    --game-primary: #c90c0f;
    --game-secondary: #f4c430;
    --nm-ink: #1a120c;
    --nm-cream: #f8f0e3;
    --nm-gold: #f4c430;
    --nm-board: #bbada0;
    --nm-empty: rgba(238, 228, 218, 0.38);
}

body.nm-page {
    margin: 0;
    min-height: 100vh;
    font-family: "Rockwell", "Rockwell Nova", "Roboto Slab", serif;
    color: #f8f4ea;
    background:
        radial-gradient(circle at 14% 10%, rgba(244, 196, 48, 0.16), transparent 42%),
        radial-gradient(circle at 88% 8%, rgba(201, 12, 15, 0.22), transparent 46%),
        linear-gradient(180deg, #2a1810 0%, #4a2c18 46%, #1a120c 100%);
}

body.nm-page.game-menu-active {
    overflow-y: auto;
    overflow-x: hidden;
}

body.nm-page.game-menu-active #game-header {
    display: none !important;
}

.nm-page .game-screen {
    display: none;
    min-height: 100vh;
}

.nm-page .game-screen.active {
    display: block;
}

body.nm-page.with-game-header .nm-shell {
    padding-top: 5.5rem;
}

.nm-shell {
    max-width: min(920px, 96vw);
    margin: 0 auto;
    padding: 1.1rem 0.75rem 2.5rem;
}

.nm-hud {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    max-width: 560px;
    margin: 0 auto 0.85rem;
    padding: 0.55rem 0.7rem;
    background: linear-gradient(180deg, #5a351c, #3b2414);
    border: 3px solid #1a120c;
    border-radius: 12px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 10px 24px rgba(0, 0, 0, 0.35);
}

.nm-lcd {
    min-width: 5.4rem;
    padding: 0.2rem 0.45rem;
    background: #140414;
    color: #f5c518;
    font-family: "Courier New", ui-monospace, monospace;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-align: center;
    border-radius: 6px;
    box-shadow: inset 0 0 0 2px #7f1d1d, inset 0 8px 16px rgba(0, 0, 0, 0.45);
}

.nm-lcd span {
    display: block;
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #f4c430;
}

.nm-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.45rem;
    margin: 0 auto 0.85rem;
    max-width: 560px;
}

.nm-chip {
    padding: 0.45rem 0.7rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    color: #fde68a;
    font-weight: 700;
}

.nm-tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    border-radius: 999px;
    border: 1px solid rgba(245, 197, 24, 0.28);
    background: rgba(26, 18, 12, 0.7);
    color: #f8f4ea;
    font-weight: 700;
    cursor: pointer;
}

.nm-tool-btn:hover {
    border-color: #f5c518;
    color: #f5c518;
}

.nm-tool-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.nm-board-wrap {
    display: flex;
    justify-content: center;
    padding: 0.25rem;
    touch-action: none;
}

.nm-board {
    --nm-n: 4;
    --nm-gap: 10px;
    --nm-cell: min(88px, calc((min(92vw, 560px) - 1.5rem - (var(--nm-n) + 1) * var(--nm-gap)) / var(--nm-n)));
    position: relative;
    width: calc(var(--nm-n) * var(--nm-cell) + (var(--nm-n) + 1) * var(--nm-gap));
    height: calc(var(--nm-n) * var(--nm-cell) + (var(--nm-n) + 1) * var(--nm-gap));
    padding: var(--nm-gap);
    background: #8f7a66;
    border: 4px solid #1a120c;
    border-radius: 14px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
    box-sizing: border-box;
}

.nm-cells {
    display: grid;
    grid-template-columns: repeat(var(--nm-n), var(--nm-cell));
    grid-template-rows: repeat(var(--nm-n), var(--nm-cell));
    gap: var(--nm-gap);
}

.nm-cell {
    background: var(--nm-empty);
    border-radius: 8px;
}

.nm-tiles {
    position: absolute;
    inset: var(--nm-gap);
    pointer-events: none;
}

.nm-tile {
    position: absolute;
    width: var(--nm-cell);
    height: var(--nm-cell);
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 800;
    line-height: 1;
    color: #776e65;
    background: #eee4da;
    transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap))));
    transition: transform 0.16s ease-in-out;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 4px 0 rgba(0, 0, 0, 0.12);
    font-size: calc(var(--nm-cell) * 0.42);
    user-select: none;
}

.nm-tile.is-sliding {
    z-index: 2;
}

.nm-tile.is-new {
    animation: nm-appear 0.18s ease-out;
}

.nm-tile.is-merge {
    z-index: 3;
    animation: nm-pop 0.18s ease;
}

.nm-tile.v-2 { background: #eee4da; color: #776e65; }
.nm-tile.v-4 { background: #ede0c8; color: #776e65; }
.nm-tile.v-8 { background: #f2b179; color: #f9f6f2; }
.nm-tile.v-16 { background: #f59563; color: #f9f6f2; }
.nm-tile.v-32 { background: #f67c5f; color: #f9f6f2; }
.nm-tile.v-64 { background: #f65e3b; color: #f9f6f2; }
.nm-tile.v-128 { background: #edcf72; color: #f9f6f2; font-size: calc(var(--nm-cell) * 0.36); }
.nm-tile.v-256 { background: #edcc61; color: #f9f6f2; font-size: calc(var(--nm-cell) * 0.36); }
.nm-tile.v-512 { background: #edc850; color: #f9f6f2; font-size: calc(var(--nm-cell) * 0.36); }
.nm-tile.v-1024 { background: #edc53f; color: #f9f6f2; font-size: calc(var(--nm-cell) * 0.3); }
.nm-tile.v-2048 { background: #edc22e; color: #1a120c; font-size: calc(var(--nm-cell) * 0.3); }
.nm-tile.v-4096,
.nm-tile.v-8192,
.nm-tile.v-16384,
.nm-tile.v-32768,
.nm-tile.v-65536 {
    background: #c90c0f;
    color: #fff;
    font-size: calc(var(--nm-cell) * 0.26);
}

@keyframes nm-appear {
    from { transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap)))) scale(0.2); opacity: 0.2; }
    to { transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap)))) scale(1); opacity: 1; }
}

@keyframes nm-pop {
    0% { transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap)))) scale(1); }
    45% { transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap)))) scale(1.14); }
    100% { transform: translate(calc(var(--c) * (var(--nm-cell) + var(--nm-gap))), calc(var(--r) * (var(--nm-cell) + var(--nm-gap)))) scale(1); }
}

.nm-score-fly {
    position: absolute;
    right: 0.4rem;
    top: -0.2rem;
    color: #f4c430;
    font-weight: 800;
    pointer-events: none;
    animation: nm-fly 0.7s ease-out forwards;
}

@keyframes nm-fly {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-22px); }
}

.nm-hint {
    text-align: center;
    color: #fde68a;
    font-size: 0.92rem;
    margin: 0.85rem 0 0;
}

.nm-settings-panel {
    margin: 0 0 1.1rem;
    padding: 1rem 1.1rem 1.15rem;
    border-radius: 16px;
    background: rgba(26, 18, 12, 0.72);
    border: 1px solid rgba(245, 197, 24, 0.28);
}

.nm-settings-panel__title {
    margin: 0 0 0.75rem;
    color: #f5c518;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.92rem;
}

.nm-settings-panel__label {
    margin: 0 0 0.45rem;
    color: #f8f0e3;
    font-weight: 600;
}

.nm-settings-panel__buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 0.85rem;
}

.nm-settings-panel__buttons .difficulty-pill,
#settingsModal .difficulty-pill {
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    padding: 0.5rem 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    color: #f8f4ea !important;
    font-weight: 600;
    cursor: pointer;
}

.nm-settings-panel__buttons .difficulty-pill.is-selected,
#settingsModal .difficulty-pill.is-selected {
    background: #f5c518;
    color: #1a120c !important;
    border-color: #f5c518;
}

.nm-settings-panel__note,
#settingsModal .nm-settings-panel__note {
    margin: 0.75rem 0 0;
    color: #fde68a;
    font-size: 0.9rem;
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    z-index: 12000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #fff;
    color: #1a1a1a;
    border-radius: 1rem;
    max-width: 640px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large {
    max-width: 760px;
}

.modal-header,
.modal-footer {
    padding: 1.1rem 1.4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.modal-header {
    border-bottom: 2px solid #eee;
}

.modal-header h2 {
    margin: 0;
    color: #c90c0f;
    font-size: 1.35rem;
}

.modal-close {
    background: #fff !important;
    border: 2px solid #c90c0f;
    color: #c90c0f !important;
    border-radius: 8px;
    cursor: pointer;
    padding: 0.35rem 0.55rem;
}

.modal-close:hover {
    background: #c90c0f !important;
    color: #fff !important;
}

.modal-body {
    padding: 1.2rem 1.4rem;
}

.modal-footer {
    border-top: 2px solid #eee;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.help-section {
    margin-bottom: 1.1rem;
}

.help-section h3 {
    color: #c90c0f;
    margin: 0 0 0.4rem;
}

.help-section ul {
    margin: 0.3rem 0 0;
    padding-left: 1.2rem;
}

.help-powers {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.help-power {
    display: inline-flex;
    min-width: 2.6rem;
    justify-content: center;
    padding: 0.35rem 0.5rem;
    border-radius: 8px;
    font-weight: 800;
    font-size: 0.9rem;
}

.help-power.nm-tile {
    position: static !important;
    transform: none !important;
    width: 2.8rem;
    height: 2.8rem;
    font-size: 0.8rem;
    animation: none;
    box-shadow: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stat-card {
    background: #f8fafc;
    border-radius: 12px;
    padding: 0.85rem;
    text-align: center;
}

.stat-value {
    font-size: 1.6rem;
    color: #c90c0f;
    font-weight: 700;
}

.stat-label {
    color: #64748b;
    font-size: 0.85rem;
}

.difficulty-stats {
    display: grid;
    gap: 0.45rem;
}

.difficulty-stats div {
    display: flex;
    justify-content: space-between;
    padding: 0.45rem 0.55rem;
    background: #f8fafc;
    border-radius: 8px;
}

.result-message {
    font-size: 1.05rem;
    margin: 0 0 1rem;
}

.win-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
    text-align: center;
}

.win-stat strong {
    display: block;
    font-size: 1.35rem;
    color: #c90c0f;
}

.win-stat span {
    color: #64748b;
    font-size: 0.82rem;
}

.nm-page .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 1.1rem;
    border-radius: 0.55rem;
    border: 2px solid transparent;
    font-weight: 700;
    cursor: pointer;
}

.nm-page .btn-primary {
    background: #c90c0f !important;
    color: #fff !important;
    border-color: #c90c0f;
}

.nm-page .btn-secondary {
    background: #fff !important;
    color: #c90c0f !important;
    border-color: #c90c0f;
}

.nm-page .btn-secondary:hover {
    background: #c90c0f !important;
    color: #fff !important;
}

#settingsModal .nm-settings-panel__title {
    color: #c90c0f;
}
#settingsModal .nm-settings-panel__label {
    color: #1a120c;
}

#settingsModal .nm-settings-panel__note {
    color: #7f1d1d;
}

#settingsModal .difficulty-pill {
    background: #fff7ed;
    color: #1a120c !important;
    border-color: #fed7aa;
}

#settingsModal .difficulty-pill.is-selected {
    background: #c90c0f;
    color: #fff !important;
    border-color: #c90c0f;
}

@media (max-width: 640px) {
    .nm-lcd {
        min-width: 3.8rem;
        font-size: 1.05rem;
    }

    .nm-tool-btn span {
        display: none;
    }
}