:root {
    --pink: #f784c5;
    --green: #1b602f;
    --bg: #f7f8fb;
    --card: #ffffff;
    --ink: #1f2937;
    --ink-2: #374151;
    --muted: #667085;
    --border: #e5e7eb;
    --focus: #93c5fd;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(16, 24, 40, 0.06);
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100vh;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

img,
svg {
    max-width: 100%;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans";
    color: var(--ink);
    background: radial-gradient(1000px 700px at 15% 10%, color-mix(in srgb, var(--pink) 10%, #fff 90%), transparent 50%),
        radial-gradient(1000px 700px at 85% 90%, color-mix(in srgb, var(--green) 12%, #fff 88%), transparent 45%),
        var(--bg);
}

code {
    font-weight: 600;
    font-size: 110%;
}

.container {
    max-width: 960px;
    margin: 32px auto;
    padding: 0 16px 20px;
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.header h1 {
    margin: 0 0 6px;
    font-size: clamp(26px, 4vw, 40px);
    font-weight: 800;
    background: linear-gradient(90deg, var(--green), var(--pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.tagline {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.4;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 12px;
    font-size: 18px;
    font-weight: 700;
}

.section-title .icon {
    width: 22px;
    height: 22px;
}

.uploader,
.preview {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.dropzone {
    display: block;
    border: 2px dashed var(--border);
    border-radius: calc(var(--radius) - 6px);
    padding: 50px;
    background: #fafafa;
    transition: border-color .2s, background .2s, transform .15s;
    cursor: pointer;
}

.dropzone:hover {
    border-color: color-mix(in srgb, var(--pink) 45%, var(--border));
    background: linear-gradient(0deg, color-mix(in srgb, var(--pink) 6%, #fff), color-mix(in srgb, var(--green) 4%, #fff));
}

.dropzone.dragover {
    border-color: var(--pink);
    background: linear-gradient(0deg, color-mix(in srgb, var(--pink) 10%, #fff), color-msrgb(in srgb, var(--green) 8%, #fff));
    transform: translateY(-1px);
}

.dz-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 0;
}

.dz-icon {
    width: 34px;
    height: 34px;
    margin-bottom: 10px;
}

.result-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.result-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.dz-text strong {
    display: block;
    font-size: 16px;
    margin-bottom: 4px;
}

.dz-text span {
    font-size: 13px;
    color: var(--muted);
}

.tiny-note {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 12px;
}

.alert {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid color-mix(in srgb, var(--pink) 40%, var(--border));
    background: color-mix(in srgb, var(--pink) 12%, #fff);
    font-size: 13px;
}

.alert.hide {
    display: none;
}

.note {
    color: var(--muted);
    font-size: 13px;
}

.preview {
    margin-top: 18px;
}

.canvas-wrap {
    position: relative;
    width: 100%;
    min-height: clamp(180px, 42vw, 380px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
}

#canvas {
    display: block;
    width: 100%;
    height: auto;
    background: #fff;
}

.placeholder {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    pointer-events: none;
    color: var(--muted);
    text-align: center;
}

.ph-stack {
    transform: translateY(-4%);
}

.ph-title {
    font-weight: 700;
    font-size: clamp(14px, 2.4vw, 22px);
    margin-bottom: 6px;
}

.ph-sub {
    font-size: clamp(11px, 1.7vw, 14px);
}

.spinner {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(255, 255, 255, 0.55);
}

.spinner::after {
    content: "";
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid color-mix(in srgb, var(--ink) 25%, transparent);
    border-top-color: var(--pink);
    border-right-color: var(--green);
    animation: spin 1s linear infinite;
}

.spinner.hide {
    display: none;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border);
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--ink);
    background: #fff;
    cursor: pointer;
    transition: transform .12s, box-shadow .12s, border-color .2s, background .2s;
    font-weight: 600;
}

.btn:focus {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: .55;
    cursor: not-allowed;
}

.btn.primary {
    border-color: color-mix(in srgb, var(--pink) 45%, var(--border));
    background: linear-gradient(90deg, color-mix(in srgb, var(--pink) 14%, #fff), color-mix(in srgb, var(--green) 10%, #fff));
}

.btn.primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(16, 24, 40, 0.08);
}

.btn .icon {
    width: 18px;
    height: 18px;
}

.btn.secondary {
    border-color: color-mix(in srgb, var(--green) 35%, var(--border));
    background: linear-gradient(90deg, color-mix(in srgb, var(--green) 7%, #fff), color-mix(in srgb, var(--pink) 6%, #fff));
}

.btn.secondary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(27, 96, 47, 0.08);
    border-color: var(--green);
}

.footer {
    margin-top: 16px;
    text-align: center;
    color: var(--muted);
    font-size: 12px;
}

.hide {
    display: none !important;
}

.ba {
    --pos: 50%;
    --ar: 1 / 1;
    position: relative;
    width: 100%;
    aspect-ratio: var(--ar);
    overflow: hidden;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.ba>canvas,
.ba>img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.ba .ba-before {
    clip-path: inset(0 calc(100% - var(--pos)) 0 0);
}

.ba .ba-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--pos);
    transform: translateX(-50%);
    width: 2px;
    background: linear-gradient(180deg, rgba(0, 0, 0, .25), rgba(255, 255, 255, .7));
    pointer-events: none;
}

.ba .ba-knob {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translate(-50%, -50%);
    width: 42px;
    height: 42px;
    border-radius: 999px;
    background: #fff;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .25);
    display: grid;
    place-items: center;
    border: 0;
    pointer-events: none;
}

.ba .ba-knob svg {
    width: 18px;
    height: 18px;
}

.ba .ba-range {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: ew-resize;
}

.ba .ba-label {
    position: absolute;
    top: 10px;
    padding: 4px 8px;
    font: 500 12px/1.2 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: #fff;
    background: rgba(0, 0, 0, .35);
    border-radius: 6px;
    backdrop-filter: blur(2px);
    user-select: none;
    pointer-events: none;
}

.ba .ba-label.before {
    left: 10px;
}

.ba .ba-label.after {
    right: 10px;
}

:root {
    --tone-track-h: 14px;
    --tone-thumb: 26px;
    --tone-thumb-border: 2px;
}

.tone-controls {
    margin-top: 12px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: linear-gradient(0deg, color-mix(in srgb, var(--pink) 6%, #fff), color-mix(in srgb, var(--green) 4%, #fff));
    box-shadow: var(--shadow);
}

.tone-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 14px;
}

.tone-label .icon {
    width: 18px;
    height: 18px;
}

#intensity-value {
    margin-left: auto;
    font-weight: 600;
    color: var(--ink-2);
}

.tone-slider {
    width: 100%;
    appearance: none;
    height: var(--tone-track-h);
    border-radius: 999px;
    background: linear-gradient(90deg, var(--green), var(--pink));
    outline: none;
}

.tone-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: var(--tone-thumb);
    height: var(--tone-thumb);
    border-radius: 50%;
    background: #fff;
    border: var(--tone-thumb-border) solid color-mix(in srgb, var(--pink) 40%, var(--green) 60%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .15);
    cursor: pointer;
    margin-top: calc((var(--tone-track-h) - var(--tone-thumb)) / 2);
}

.tone-slider::-webkit-slider-runnable-track {
    height: var(--tone-track-h);
    border-radius: 999px;
}

.tone-slider::-moz-range-track {
    height: var(--tone-track-h);
    border-radius: 999px;
    background: transparent;
}

.tone-slider::-moz-range-thumb {
    width: var(--tone-thumb);
    height: var(--tone-thumb);
    border-radius: 50%;
    background: #fff;
    border: var(--tone-thumb-border) solid color-mix(in srgb, var(--pink) 40%, var(--green) 60%);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .15);
    cursor: pointer;
}

@media (max-width: 600px) {
    .dropzone {
        padding: 30px;
    }

    .result-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .result-actions {
        justify-content: flex-end;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px 16px;
    }

    .uploader,
    .preview {
        padding: 14px;
    }

    .dz-inner {
        flex-direction: column;
    }
}