:root {
    color-scheme: dark;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #090e0e;
    color: #f4f4f4;
    line-height: 1.6;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(ellipse at top right, #124441, transparent 65%);
}
main { width: min(100% - 2rem, 64rem); margin: 0 auto; padding: 3rem 0; }
header { margin-bottom: 2rem; }
h1 { font-size: clamp(2rem, 6vw, 4rem); line-height: 1.15; margin: .5rem 0 1rem; }
p { margin: .5rem 0 1rem; }
.eyebrow { color: #69e0d9; font-size: .85rem; font-weight: 700; letter-spacing: .16em; }
.hint, header > p:last-child, footer { color: #b7c9c8; }
.hint { font-size: .9rem; }
.panel { padding: clamp(1rem, 3vw, 2rem); border: 1px solid #37504e; border-radius: 1rem; background: #101b1b; }
label, legend { font-weight: 600; }
textarea {
    display: block;
    width: 100%;
    padding: 1rem;
    border: 1px solid #65807e;
    border-radius: .5rem;
    background: #f4f4f4;
    color: #101b1b;
    font: 1rem/1.5 ui-monospace, "Cascadia Code", Consolas, monospace;
    resize: vertical;
}
.output { white-space: pre; overflow: auto; font-size: .875rem; min-height: 16rem; }
fieldset { margin: 1.5rem 0; padding: 0; border: 0; }
.styles { display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; margin-top: .5rem; }
.styles label { cursor: pointer; padding: .5rem 0; }
input[type="radio"] { accent-color: #69e0d9; margin-right: .35rem; }
button, .button {
    display: inline-block;
    border: 0;
    border-radius: .5rem;
    padding: .85rem 1.5rem;
    background: #69e0d9;
    color: #091b1a;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
}
button:hover, .button:hover { background: #a5f4ee; }
:focus-visible { outline: 3px solid #f2c66d; outline-offset: 4px; }
details { margin: 1rem 0; }
summary { cursor: pointer; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; }
footer { font-size: .85rem; margin-top: 1.5rem; }
nav { display: flex; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }
nav a { color: #69e0d9; text-underline-offset: .3em; }
nav a[aria-current] { color: #fff; font-weight: 700; }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: 1.5rem; }
button:disabled { opacity: .45; cursor: not-allowed; }
.image-preview { text-align: center; border-radius: .5rem; background: #f4f4f4; color: #101b1b; padding: .5rem; }
.image-preview img { max-width: 100%; max-height: 15rem; object-fit: contain; }
.image-preview p { margin: 0; overflow-wrap: anywhere; }
.drop-zone { display: block; text-align: center; border: 2px dashed #8fa9a7; border-radius: .75rem; padding: 1.25rem; margin-top: .75rem; cursor: pointer; }
.drop-zone:focus-within { border-color: #69e0d9; background: #173b39; }
.drop-zone input { display: block; max-width: 100%; margin: .75rem auto 0; font: inherit; }
.image-controls { display: grid; grid-template-columns: minmax(10rem, auto) minmax(0, 1fr) 6rem; gap: .75rem; align-items: center; margin: 1.5rem 0; }
.image-controls label { font-size: .9rem; font-weight: 400; }
.image-controls input[type="range"] { width: 100%; min-width: 0; margin: 0; accent-color: #69e0d9; cursor: pointer; }
.image-controls input[type="checkbox"] { accent-color: #69e0d9; }
.image-controls .control-value { font-size: .85rem; text-align: right; font-variant-numeric: tabular-nums; }
.image-controls select { grid-column: span 2; width: 100%; padding: .6rem; border: 1px solid #65807e; border-radius: .4rem; background: #202d2c; color: #fff; font: inherit; }
.image-output { font: 12px/14px "Courier New", monospace; }
hr { border: 0; border-top: 1px solid #37504e; margin: 2rem 0; }
@media (max-width: 40rem) {
    .image-controls { grid-template-columns: minmax(0, 1fr) 6rem; gap: .4rem .75rem; }
    .image-controls label { grid-column: 1 / -1; margin-top: .5rem; }
}
@media (max-width: 30rem) {
    main { padding-top: 1.5rem; }
    button, .button { width: 100%; text-align: center; }
}