:root {
    --accent: #F90;
    --accent-dark: #d97e00;
    --bg1: #f6f8fb;
    --bg2: #e8edf3;
    --card: #ffffff;
    --text: #262930;
    --muted: #6b7280;
    --border: #e3e7ec;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(180deg, var(--bg1), var(--bg2)) no-repeat;
    background-attachment: fixed;
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.65;
    font-size: 16px;
}
#sqText {
    max-width: 860px;
    margin: 0 auto;
    padding: 28px 20px 72px;
}
h1 {
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 2.3rem;
    font-weight: 700;
    margin: 4px 0 2px;
}
#logo {
    width: 58px;
    height: 58px;
    border-radius: 15px;
    box-shadow: 0 4px 14px rgba(255, 153, 0, .35);
}
.tagline { color: var(--muted); margin: 0 0 20px; font-size: 1.03rem; }
h2 {
    color: var(--text);
    font-size: 1.2rem;
    font-weight: 600;
    margin: 28px 0 12px;
    padding-left: 12px;
    border-left: 4px solid var(--accent);
}
a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 22px;
    margin: 14px 0;
    box-shadow: 0 1px 4px rgba(20, 30, 50, .05);
}
.added {
    background: #fff7eb;
    border: 1px solid #ffdfac;
    border-radius: 14px;
    padding: 16px 20px;
    margin: 16px 0 10px;
}
.added strong { color: var(--accent-dark); }
.added ul { margin: 8px 0 0; }
.opts { margin: 6px 0 14px; }
.opts label {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 7px 0;
    cursor: pointer;
}
.opts input[type=checkbox] { margin-top: 4px; width: 16px; height: 16px; accent-color: var(--accent); flex: none; }
.muted { color: var(--muted); font-size: .9rem; }
ul { padding-left: 22px; }
li { margin: 5px 0; }
em { color: var(--muted); }
pre {
    background: #1f2430;
    color: #e7ebf0;
    padding: 16px 18px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.5;
}
code {
    background: #eef1f5;
    padding: 1px 6px;
    border-radius: 5px;
    font-size: .9em;
}
pre code { background: none; padding: 0; }
#drop {
    color: var(--muted);
    border: 2px dashed #c3cbd4;
    border-radius: 12px;
    min-height: 54px;
    margin: 12px 0;
    padding: 14px 16px;
    background: #fbfcfe;
    transition: border-color .15s, background .15s;
}
input[type=file] { font-size: .92rem; }
.filelist > ul {
    max-height: 120px;
    overflow: auto;
    margin: 10px 0 0;
    padding: 10px 12px;
    background: #f6f8fb;
    border-radius: 8px;
    font-size: .9rem;
}
#filestats { color: var(--muted); font-size: .85rem; margin-top: 6px; }

/* --- functional styles for the running VM (worker + main-thread) --- */
#sqCanvas {
    display: none;
    position: fixed;
    background: #000;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}
#sqCanvas.pixelated {
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: pixelated;
    -ms-interpolation-mode: nearest-neighbor;
}
/* Loading indicator (worker boot / zip download). Deliberately NOT the old rotating
   "ruedita" — a slim linear indeterminate bar with a label, so it reads as modern
   progress and never as the freeze it replaced. */
div#sqSpinner {
    position: fixed;
    left: 50%; top: 50%;
    transform: translate(-50%, -50%);
    padding: 16px 22px 18px;
    border-radius: 12px;
    background: rgba(18, 18, 22, 0.72);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    color: #fff;
    font: 500 14px/1 system-ui, -apple-system, "Segoe UI", sans-serif;
    letter-spacing: .01em;
    display: none;
    z-index: 30;
}
div#sqSpinner::before {
    /* the label is set from JS (localized to the browser language, staged:
       downloading → starting + heartbeat); empty by default */
    content: attr(data-label);
    display: block;
    text-align: center;
    margin-bottom: 12px;
    opacity: .9;
    max-width: 70vw;
}
/* while an image loads, the page goes dark (no white flash, no stray black rect —
   the canvas itself stays hidden until the image paints its first frame) */
body.sq-loading {
    background: #16161a;
}
div#sqSpinner > div {
    position: relative;
    width: 170px;
    height: 3px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.16);
    overflow: hidden;
}
div#sqSpinner > div::after {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 40%;
    height: 100%;
    border-radius: 3px;
    background: var(--accent);
    animation: sqLoadSlide 1.15s ease-in-out infinite;
}
@keyframes sqLoadSlide {
    0%   { left: -40%; }
    100% { left: 100%; }
}
/* worker-mode "open file" button (shown only while a worker image is running) */
#sqOpenBtn {
    display: none;
    position: fixed;
    top: 2px;
    right: 2px;
    z-index: 10;
    font-size: 22px;
    line-height: 1;
    padding: 8px 10px;
    border: none;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.45);
    color: #fff;
    cursor: pointer;
    opacity: 0.5;
}
#sqOpenBtn:hover { opacity: 1; }