:root {
    color-scheme: light;
    --page: #f3f5f7;
    --panel: #ffffff;
    --ink: #18202a;
    --muted: #69737e;
    --border: #d9dfe5;
    --soft: #f6f8fa;
    --accent: #168f32;
    --accent-dark: #0d6e25;
    --danger: #b42318;
    --shadow: 0 18px 50px rgba(25, 35, 45, 0.11);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--page);
    color: var(--ink);
    font-family: Arial, Helvetica, sans-serif;
}

button, input, select, textarea { font: inherit; }

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 10px 13px;
    background: #fff;
    color: var(--ink);
    font-weight: 750;
    cursor: pointer;
    transition: background .15s, border-color .15s, color .15s, transform .15s;
}

button:hover {
    transform: translateY(-1px);
    border-color: #b7c0c8;
}

.app-shell {
    width: min(1580px, calc(100% - 30px));
    margin: 0 auto;
    padding: 28px 0 44px;
}

.app-header { margin-bottom: 18px; }

.app-header h1 {
    margin: 2px 0 7px;
    font-size: clamp(2rem, 3.8vw, 3.3rem);
    letter-spacing: -0.045em;
}

.app-header p { margin: 0; color: var(--muted); }

.eyebrow {
    color: var(--accent) !important;
    font-weight: 850;
    letter-spacing: .13em;
    text-transform: uppercase;
    font-size: .75rem;
}

.editor-grid {
    display: grid;
    grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
    gap: 22px;
    align-items: start;
}

.controls,
.preview-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.controls {
    max-height: calc(100vh - 34px);
    overflow-y: auto;
    position: sticky;
    top: 17px;
    padding: 10px;
    scrollbar-width: thin;
}

.control-section {
    border-bottom: 1px solid var(--border);
}

.control-section:last-of-type { border-bottom: 0; }

.control-section summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 10px;
    cursor: pointer;
    user-select: none;
    font-weight: 850;
    text-transform: uppercase;
    letter-spacing: .06em;
    font-size: .76rem;
    color: #38424d;
}

.control-section summary::-webkit-details-marker { display: none; }

.control-section summary span {
    display: inline-flex;
    align-items: center;
    gap: 9px;
}

.control-section summary .bi:first-child {
    font-size: 1.02rem;
    color: var(--accent);
}

.section-chevron {
    transition: transform .18s ease;
    color: var(--muted);
}

.control-section[open] .section-chevron { transform: rotate(180deg); }

.section-content {
    display: grid;
    gap: 15px;
    padding: 3px 10px 17px;
}

label {
    display: grid;
    gap: 7px;
    font-weight: 720;
    font-size: .9rem;
}

textarea,
select,
input[type="text"] {
    width: 100%;
    min-width: 0;
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 10px 11px;
    background: #fff;
    color: var(--ink);
}

textarea {
    resize: vertical;
    min-height: 112px;
    line-height: 1.25;
}

input[type="color"] {
    width: 100%;
    min-width: 0;
    height: 42px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: #fff;
}

input[type="range"] {
    width: 100%;
    min-width: 0;
}

input[type="checkbox"] {
    width: 17px;
    height: 17px;
    accent-color: var(--accent);
}

.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 11px;
}

.input-reset-row,
.file-reset-row,
.textarea-reset-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 25px;
    gap: 7px;
    align-items: center;
}

.textarea-reset-row { align-items: start; }

.slider-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 58px 25px;
    gap: 8px;
    align-items: center;
}

.slider-row.no-reset {
    grid-template-columns: minmax(0, 1fr) 58px;
}

output {
    text-align: right;
    color: var(--muted);
    font-size: .82rem;
    font-weight: 750;
    white-space: nowrap;
}

.default-button {
    width: 25px;
    height: 25px;
    min-width: 25px;
    padding: 0;
    border-radius: 6px;
    color: #8a949e;
    background: #fff;
    font-size: .87rem;
}

.default-button:hover {
    color: var(--accent-dark);
    border-color: var(--accent);
    background: #f2fbf4;
}

.hint {
    color: var(--muted);
    font-size: .77rem;
    font-weight: 400;
    line-height: 1.35;
}

.upload-button {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: #fff;
    cursor: pointer;
    font-size: .88rem;
}

.upload-button:hover {
    border-color: #b7c0c8;
    background: var(--soft);
}

.visually-hidden-file {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
}

.selected-file {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: .78rem;
    font-weight: 400;
    overflow-wrap: anywhere;
}

.check-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.effect-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.effect-options {
    display: grid;
    gap: 13px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--soft);
}

.effect-options.is-disabled {
    opacity: .45;
    pointer-events: none;
}

.inline-action-row {
    display: flex;
    align-items: center;
    gap: 7px;
}

.inline-action-row > button:first-child { flex: 1; }

.preset-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 7px;
}

.preset-row:has(#presetSelect) {
    grid-template-columns: minmax(0, 1fr) auto auto;
}

.danger {
    color: var(--danger);
}

.export-actions {
    display: grid;
    gap: 8px;
    padding: 14px 10px 5px;
}

.download-button {
    width: 100%;
    padding: 13px 16px;
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-size: .98rem;
}

.download-button:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
}

.reset-all-button {
    width: 100%;
    border: 0;
    background: transparent;
    color: var(--muted);
    font-size: .83rem;
    padding: 8px;
}

.preview-panel {
    padding: 16px;
}

.preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 11px;
    color: var(--muted);
    font-size: .8rem;
}

.preview-toolbar span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 11px;
    border-radius: 999px;
    background: var(--soft);
}

.canvas-frame {
    overflow: hidden;
    border-radius: 13px;
    border: 1px solid var(--border);
}

.checkerboard {
    background-color: #fff;
    background-image:
        linear-gradient(45deg, #e8e8e8 25%, transparent 25%),
        linear-gradient(-45deg, #e8e8e8 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e8e8e8 75%),
        linear-gradient(-45deg, transparent 75%, #e8e8e8 75%);
    background-size: 28px 28px;
    background-position: 0 0, 0 14px, 14px -14px, -14px 0;
}

canvas {
    display: block;
    width: 100%;
    height: auto;
    cursor: grab;
}

canvas.is-dragging { cursor: grabbing; }

.status {
    margin: 11px 2px 0;
    color: var(--muted);
    font-size: .83rem;
}

@media (max-width: 920px) {
    .editor-grid { grid-template-columns: 1fr; }
    .controls {
        position: static;
        max-height: none;
    }
}

@media (max-width: 520px) {
    .app-shell {
        width: min(100% - 18px, 1580px);
        padding-top: 17px;
    }

    .two-column { grid-template-columns: 1fr; }
    .slider-row { grid-template-columns: minmax(0, 1fr) 54px 25px; }
}


/* Standard 3D Universe site integration */
.message-maker-card {
    position: relative;
    z-index: 1;
    padding: 24px;
}

.message-maker-heading {
    margin-top: 6px;
}

.message-maker-card .editor-grid {
    width: 100%;
    margin-top: 28px;
}

@media (max-width: 920px) {
    .message-maker-card {
        padding: 18px;
    }
}