:root {
    --color-sky: #161b22; 
    --color-text-light: #ffffff;
    --color-text-subtle: #9ca3af; 
    --color-bg-panel: #374151; 
    --color-control-bg: #1f2937; 
    --color-control-border: #4b5563; 

    --color-hover-light: #4b5563; 

    --color-primary-action: #2563eb; 
    --color-primary-hover: #3b82f6; 

    --color-secondary-action: var(--color-control-bg); 
    --color-secondary-hover: var(--color-hover-light);

    --color-selection-ring: #facc15; 

    --color-success-bg: #14532d; 
    --color-success-border: #4ade80; 
    --color-success-text: #dcfce7; 

    --color-error-bg: #991b1b; 
    --color-error-border: #fca5a5; 
    --color-error-text: #fee2e2; 

    --color-info-bg: #1e3a8a; 
    --color-info-border: #93c5fd; 
    --color-info-text: #eff6ff; 

    --font-game-block: 'Press Start 2P', 'Monaco', 'Lucida Console', monospace;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-sky);
    color: var(--color-text-light);

    padding: 1rem;
    min-height: 10vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

@media (min-width: 640px) {
    body {
        padding: 2rem;
    }
}

h1 {

    font-size: 1.875rem; 
    font-weight: 800;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

p.subtitle {

    font-size: 0.875rem; 
    color: var(--color-text-subtle);
    margin-bottom: 1rem;
}

.responsive-layout {
    width: 100%;

    max-width: 1240px; 
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem; 
}

.canvas-wrapper {

    width: 100%;
    max-width: 800px; 
    position: relative;
    padding-bottom: 75%; 
    border-radius: 0.75rem;
    overflow: hidden;

    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4); 
}

.canvas-container {

    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#gameCanvas {

    display: block;
    width: 100%; 
    height: 100%;
}

.control-panel {

    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;

    max-width: 100%; 
    padding-left: 1rem;
    padding-right: 1rem;
    box-sizing: border-box;
}

@media (min-width: 1024px) {

    body {

        padding: 4rem 2rem;
    }

    .responsive-layout {

        display: grid;

        grid-template-columns: 1fr minmax(300px, 400px); 
        gap: 2rem;
        align-items: start;
        width: 100%; 
    }

    .canvas-wrapper {

        max-width: 800px;
        margin-bottom: 0; 

        margin-left: auto;
        margin-right: auto;
        width: 100%; 
    }

    .control-panel {

        padding-left: 0;
        padding-right: 0;
        align-items: flex-start;
        max-width: none; 
    }
}

#messageBox {

    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);

    margin-top: 1rem;
    padding: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    z-index: 50; 

    border: 1px solid;

    opacity: 1; 

    display: none; 
}

@media (max-width: 639px) {
    #messageBox {
        width: 90%; 
        max-width: 400px;
    }
}

@keyframes slideFadeOut {
    0% { opacity: 1; transform: translate(-50%, 0); }
    100% { opacity: 0; transform: translate(-50%, -10px); }
}

#messageText {

    font-size: 0.875rem; 
    font-weight: 600;
    line-height: 1.5;
}

#messageBox.info {
    background-color: var(--color-info-bg);
    border-color: var(--color-info-border);
    color: var(--color-info-text);
}

#messageBox.success {
    background-color: var(--color-success-bg);
    border-color: var(--color-success-border);
    color: var(--color-success-text);
}

#messageBox.error {
    background-color: var(--color-error-bg);
    border-color: var(--color-error-border);
    color: var(--color-error-text);
}

h2 {

    font-size: 1.25rem; 
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: 0.75rem;
    text-align: center;
}

@media (min-width: 1024px) {
    .editor-block h2 {

        text-align: left;
    }
}

.editor-block {

    padding: 1em;
    background-color: var(--color-bg-panel);
    border-radius: 0.75rem; 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    width: 100%;
}

.mode-controls {

    display: flex;
    gap: 0.5rem;
    width: 100%;

    max-width: 300px; 
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .mode-controls {

        max-width: none; 
        margin: 0;
    }
}

.mode-button {

    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    transition: background-color 150ms ease-in-out, color 150ms ease-in-out;
    flex: 1;
    border: 1px solid var(--color-control-border); 
    cursor: pointer;
    background-color: var(--color-control-bg); 
    color: var(--color-text-light);
}

.mode-button:not(.selected-mode):hover {
    background-color: var(--color-hover-light);
}

.mode-button.selected-mode {

    background-color: var(--color-primary-action); 
    color: var(--color-text-light); 
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); 
    border-color: var(--color-primary-action);
}

.editor-controls {

    display: flex;
    flex-direction: column;
    gap: 1rem; 
    width: 100%;
}

#tileSelector {

    display: grid; 

    grid-template-columns: repeat(3, 1fr); 
    gap: 0.75rem; 
    width: 100%;
}

@media (min-width: 640px) {
    #tileSelector {

        grid-template-columns: repeat(4, 1fr); 
    }
}

@media (min-width: 1024px) {
    #tileSelector {

        grid-template-columns: repeat(3, 1fr); 
    }
}

.tile-selector-item {

    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem; 
    border-radius: 0.5rem; 
    cursor: pointer;
    transition: background-color 150ms ease-in-out, box-shadow 200ms ease-in-out;
    background-color: var(--color-control-bg); 
    border: 1px solid var(--color-control-border);

    --tile-color: var(--color-control-bg); 
}

.tile-selector-item:hover {

    background-color: var(--color-bg-panel); 
}

.tile-selector-item i {

    font-size: 1.5rem; 
    margin-bottom: 0.25rem;
    color: var(--tile-color); 
}

.tile-selector-item span {

    font-size: 0.75rem; 
    font-weight: 500;
    color: var(--color-text-subtle);
    text-align: center;
}

.tile-selector-item.selected {

    box-shadow: 0 0 0 3px var(--color-selection-ring); 
    background-color: var(--color-bg-panel); 
    border-color: var(--color-selection-ring); 
}

.color-picker-group {

    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
}

.color-picker-group label {
    font-weight: 500;
    color: var(--color-text-light);
}

.color-picker-grid {

    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem; 
    margin-top: 0.75rem;
}

#blockColorInput, #playerColorInput, #skylineColorInput {

    width: 2rem; 
    height: 2rem; 
    border-radius: 9999px; 
    border: 3px solid var(--color-control-border);
    padding: 0;
    cursor: pointer;

    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background: none;
}

#blockColorInput::-webkit-color-swatch, #playerColorInput::-webkit-color-swatch, #skylineColorInput::-webkit-color-swatch {
    border: none;
    border-radius: 9999px;
}

#blockColorInput::-moz-color-swatch, #playerColorInput::-moz-color-swatch, #skylineColorInput::-moz-color-swatch {
    border: none;
    border-radius: 9999px;
}

.input-group {

    width: 100%;
}

#levelCodeInput {

    width: 100%;
    padding: 0.5rem;
    font-size: 0.875rem;
    background-color: var(--color-control-bg);
    color: var(--color-text-light);
    border-radius: 0.5rem;
    border: 1px solid var(--color-control-border);
    box-sizing: border-box; 
}

#levelCodeInput:focus {
    border-color: var(--color-selection-ring);
    box-shadow: 0 0 0 1px var(--color-selection-ring);
    outline: none;
}

#generatedCodeDisplay {

    margin-top: 1rem;
}

.code-output {

    padding: 0.5rem;
    background-color: var(--color-control-bg);
    border: 1px dashed var(--color-control-border);
    color: var(--color-text-light); 
    font-size: 0.875rem;
    border-radius: 0.5rem;
    word-break: break-all;
    white-space: pre-wrap;
    font-family: 'Monaco', monospace;
    box-sizing: border-box; 
    margin-bottom: 0.5rem; 
    cursor: copy; 
}

.action-buttons {

    margin-top: 1rem; 
    display: flex;
    gap: 1rem;
    justify-content: center;
    width: 100%;
}

.action-button {
    background-color: var(--color-secondary-action); 
    color: var(--color-text-light);
    font-weight: 600; 
    padding: 0.75rem 1.25rem; 
    border-radius: 0.5rem; 
    transition: background-color 200ms ease-in-out, box-shadow 200ms ease-in-out;
    border: 1px solid transparent;
    cursor: pointer;
    flex: 1;
    max-width: 150px;
}

.action-button:hover {
    background-color: var(--color-secondary-hover);
}

.action-button.primary-action {
    background-color: var(--color-primary-action);
}

.action-button.primary-action:hover {
    background-color: var(--color-primary-hover);
}