* {
    box-sizing: border-box;
}

body {
    --bg: #120d0d;
    --surface: rgba(34, 18, 16, 0.76);
    --surface-strong: rgba(18, 10, 9, 0.62);
    --text: #f8f4f1;
    --muted: #ccb7ad;
    --line: rgba(255, 180, 128, 0.18);
    --accent: #ff8a4d;
    --accent-strong: #ff6136;
    --checker-a: rgba(255,255,255,0.08);
    --checker-b: rgba(0,0,0,0.22);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 28px;
    background:
        radial-gradient(circle at top, color-mix(in srgb, var(--accent) 18%, transparent) 0%, transparent 42%),
        radial-gradient(circle at bottom right, color-mix(in srgb, var(--accent-strong) 12%, transparent) 0%, transparent 35%),
        linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%),
        var(--bg);
    color: var(--text);
}

.container {
    width: min(980px, 100%);
    background: var(--surface);
    padding: clamp(22px, 4vw, 42px);
    border-radius: 24px;
    box-shadow: 0 24px 70px rgba(0,0,0,0.48);
    text-align: center;
    border: 1px solid var(--line);
    backdrop-filter: blur(14px);
}

.hero {
    margin-bottom: 24px;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

h1 {
    margin: 0;
    background: linear-gradient(to right, var(--accent), var(--accent-strong));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1;
}

.subtitle {
    max-width: 560px;
    margin: 14px auto 0;
    color: var(--muted);
}

#upload {
    display: none;
}

.upload-label {
    display: grid;
    gap: 4px;
    place-items: center;
    min-height: 132px;
    padding: 22px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px dashed color-mix(in srgb, var(--accent) 52%, var(--line));
    border-radius: 18px;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.upload-label:hover,
.upload-label.is-dragging {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
}

.upload-icon {
    font-size: 2rem;
}

.upload-label small,
.preview-header small,
.control-row p {
    color: var(--muted);
}

.panel,
.preview-card {
    margin-top: 18px;
    background: var(--surface-strong);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.controls-panel {
    display: grid;
    gap: 16px;
    padding: 18px;
    text-align: left;
}

body[data-dashboard-sidebar-externalized="true"] .controls-panel {
    display: none;
}

.control-row {
    display: grid;
    grid-template-columns: minmax(190px, 1fr) minmax(220px, 320px);
    gap: 18px;
    align-items: center;
}

.control-row label,
.field span {
    display: block;
    margin-bottom: 5px;
    font-weight: 700;
}

.control-row p {
    margin: 0;
    font-size: 0.88rem;
}

.range-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

input[type=range] {
    width: 100%;
    min-width: 160px;
    cursor: pointer;
    accent-color: var(--accent);
}

#opacityValue,
#alphaThresholdValue {
    min-width: 58px;
    font-weight: 800;
    color: var(--accent);
    text-align: right;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.field {
    display: grid;
    gap: 8px;
}

select,
input[type=color] {
    width: 100%;
    min-height: 44px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0 12px;
    outline: none;
}

input[type=color] {
    padding: 6px;
}

.color-field {
    transition: opacity 0.2s;
}

.color-field.is-disabled {
    opacity: 0.42;
    pointer-events: none;
}

.preview-card {
    overflow: hidden;
    padding: 0 0 18px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--line);
    font-weight: 700;
}

.tool-status {
    padding: 12px 18px 0;
    color: var(--muted);
    text-align: left;
    font-size: 0.92rem;
}

.tool-status[data-status-tone="busy"] {
    color: var(--accent);
}

.tool-status[data-status-tone="ok"] {
    color: #93ddb0;
}

.tool-status[data-status-tone="error"] {
    color: #ff9f8c;
}

canvas {
    display: block;
    max-width: calc(100% - 36px);
    height: auto;
    min-height: 180px;
    margin: 18px auto 0;
    border-radius: 14px;
    box-shadow: 0 16px 36px rgba(0,0,0,0.28);
    background-image:
        linear-gradient(45deg, var(--checker-b) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-b) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-b) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-b) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: var(--checker-a);
    border: 1px solid var(--line);
}

button {
    margin-top: 22px;
    padding: 15px 30px;
    cursor: pointer;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
    color: white;
    border: none;
    border-radius: 999px;
    font-weight: 800;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 34%, transparent);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px color-mix(in srgb, var(--accent-strong) 42%, transparent);
}

button:active {
    transform: translateY(0);
}

@media (max-width: 760px) {
    body {
        padding: 14px;
    }

    .control-row,
    .control-grid {
        grid-template-columns: 1fr;
    }

    .preview-header {
        align-items: flex-start;
        flex-direction: column;
    }
}