:root {
    --bg: #0b0f17;
    --card: #151b26;
    --muted: #b6c3d9;
    --text: #e8eefc;
    --accent: #6aa3ff;
    --ok: #19c37d;
    --warn: #f9a826;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.wrap {
    max-width: 980px;
    margin: 32px auto;
    padding: 0 16px;
}

.card {
    background: var(--card);
    border: 1px solid #202838;
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .25);
}

h1 {
    font-size: 20px;
    margin: 0 0 16px;
}

.row {
    display: grid;
    /* Set columns to ~40% (Top-K + buttons) and ~60% (Quick tips) */
    grid-template-columns: 4fr 6fr;
    gap: 30px;
    align-items: start;
}

.stack {
    display: grid;
    gap: 10px;
}

textarea, input[type="text"], input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #2a3347;
    background: #0f1420;
    color: var(--text);
    outline: none;
}

/* Range slider base */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 28px; /* gives room for thumb */
    background: transparent;
}

/* Track */
input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    background: #2a3347;
    border-radius: 999px;
}
input[type="range"]::-moz-range-track {
    height: 6px;
    background: #2a3347;
    border-radius: 999px;
}

/* Thumb */
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 0;
    margin-top: -6px; /* center on track */
    cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 0;
    cursor: pointer;
}

/* Helper layout for captions around slider */
.row-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 12px;
}

textarea {
    min-height: 110px;
    resize: vertical;
}

.btnbar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button, .upload-btn {
    background: #0f1420;
    color: var(--text);
    border: 1px solid #2a3347;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}
button:hover, .upload-btn:hover { border-color: var(--accent); }


button.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #07162e;
    font-weight: 600;
}

.muted {
    color: var(--muted);
    font-size: 12px;
}
#topkVal { font-weight:bold; }

.grid {
    display: grid;
    gap: 12px;
}

.result {
    background: #0f1420;
    border-radius: 12px;
    padding: 12px;
    border: 1px solid #2a3347;
}

.kvs {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 6px 10px;
    font-size: 13px;
}

.kvs div:nth-child(odd) {
    color: var(--muted);
}

code {
    background: #0c111a;
    color: #d7e3ff;
    padding: 2px 6px;
    border-radius: 6px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

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

/* --- Layout stability tweaks --- */
*, *::before, *::after {
    box-sizing: border-box;
}

/* Prevent layout breakage with long content inside results */
.result {
    overflow-x: auto;
}
.result, .result * {
    overflow-wrap: anywhere;
    word-break: break-word;
}

/* Responsive: stack side-by-side controls on narrow screens */
@media (max-width: 900px) {
    .row { grid-template-columns: 1fr; }
}

/* Space between Upload button bar and the following Query label */
.card .btnbar + label.muted { display: block; margin-top: 16px; }

/* Space between Query textarea and the Top-K/Quick tips row */
textarea + .row { margin-top: 16px; }

/* Extra space between the Top-K value line and the action buttons */
.row .stack > .muted + .btnbar { margin-top: 12px; }

/* Fullscreen dimmer */
#busy-layer{
  position: fixed; inset: 0; z-index: 9999;
  display: grid; place-items: center;
  /* translucent backdrop so content is still visible */
  background: rgba(0,0,0,.28);
  backdrop-filter: blur(2px);
  opacity: 0; pointer-events: none;
  transition: opacity .2s ease;
}

/* When active */
#busy-layer.show{ opacity: 1; pointer-events: auto; }

/* Foreground card stays readable */
#busy-layer .busy-panel{
  display: flex; align-items: center; gap: 12px;
  min-width: 220px; padding: 12px 16px;
  border-radius: 12px;
  background: rgba(255,255,255,.92);
  box-shadow: 0 10px 30px rgba(0,0,0,.2);
  color: #111;
}

/* Spinner */
#busy-layer .spinner{
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 3px solid currentColor;
  border-top-color: transparent;
  animation: spin .8s linear infinite;
}

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

/* Optional: nicer disabled buttons while busy */
button[disabled]{ opacity:.6; cursor:not-allowed; }

/* Visually dim disabled controls */
button:disabled, input:disabled, textarea:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Optional: prevent scroll while busy */
body.busy {
    overflow: hidden;
}