* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Palette echoes Interactive Sudoku Solver so the two feel like one system. */
  --bg: #ffffff;
  --bg-surface: #ffffff;
  --bg-header: hsl(210 20% 96%);
  --bg-hover: #e1f0ff;
  --text: #333333;
  --text-muted: grey;
  --color-primary: #2dabf9;
  --color-primary-dark: #0688fa;
  --border: #ccc;
  --border-strong: #aaa;

  /* Status tiers */
  --status-ok: #00ad40;
  --status-warn: #f97316;
  --status-bad: #d0451b;
  --status-oversized: #9f5b4f;
  --status-idle: #999999;

  --font-body: "Arial", sans-serif;
  --font-mono: monospace;
  --fs-base: 14px;
  --fs-small: 12px;
  --fs-title: 18px;
  --gap: 10px;
  --page-x: calc(var(--gap) * 1.5);
  --sticky-controls-height: 0px;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  color: var(--text);
  background: var(--bg);
  line-height: 1.4;
  padding: var(--gap) var(--page-x) calc(var(--gap) * 3);
  max-width: 1100px;
  margin: 0 auto;
}

a { color: var(--color-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.segmented {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--fs-small);
  color: var(--text-muted);
}
.segmented label { cursor: pointer; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented label span {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 2px 8px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-muted);
  user-select: none;
}
.segmented label:first-of-type span { border-radius: 11px 0 0 11px; }
.segmented label:last-of-type span { border-radius: 0 11px 11px 0; }
.segmented label + label span { margin-left: -5px; }
.segmented input:checked + span {
  position: relative;
  z-index: 1;
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.segmented input:focus-visible + span {
  position: relative;
  z-index: 2;
  box-shadow: 0 0 0 2px var(--color-primary);
}

/* --- Header --- */
header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap);
  padding-bottom: var(--gap);
  border-bottom: 1px solid var(--border);
}
h1 { font-size: var(--fs-title); font-weight: bold; }
.subtitle { color: var(--text-muted); font-size: var(--fs-small); max-width: 60ch; margin-top: 2px; }
.header-side { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.attribution { font-size: var(--fs-small); color: var(--text-muted); white-space: nowrap; }

/* --- Controls --- */
#controls {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin: 0 calc(var(--page-x) * -1);
  padding: var(--gap) var(--page-x);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.filter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
#filter {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 10px;
  font: inherit;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
}
#filter:focus { outline: 2px solid var(--color-primary); outline-offset: -1px; }
#filter::-webkit-search-cancel-button {
  cursor: pointer;
  opacity: 0.65;
}
#filter::-webkit-search-cancel-button:hover { opacity: 1; }

.active-filters {
  display: flex;
  flex: 0 1 auto;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}
.active-filters[hidden] { display: none; }
.active-filter {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  overflow: hidden;
  color: var(--text);
  background: var(--bg-surface);
  font: inherit;
  font-size: var(--fs-small);
}
.active-filter.negative {
  border-color: hsl(12 60% 70%);
  color: var(--status-bad);
  background: hsl(12 75% 97%);
}
.active-filter-toggle,
.active-filter-remove {
  border: 0;
  color: inherit;
  background: none;
  font: inherit;
  cursor: pointer;
}
.active-filter-toggle {
  padding: 2px 8px;
}
.active-filter-remove {
  align-self: stretch;
  padding: 0 7px;
  color: var(--text-muted);
  border-left: 1px solid var(--border);
}
.active-filter.negative .active-filter-remove { border-left-color: hsl(12 60% 82%); }
.active-filter-toggle:hover,
.active-filter-remove:hover { background: var(--bg-hover); }
.active-filter-remove:hover { color: var(--text); }
.active-filter.negative .active-filter-toggle:hover,
.active-filter.negative .active-filter-remove:hover { background: hsl(12 75% 93%); }
.active-filter-toggle:focus-visible,
.active-filter-remove:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.status-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
#count { font-size: var(--fs-small); color: var(--text-muted); white-space: nowrap; }
.count-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}
/* Small outlined control, used for buttons and links on both pages. */
.pill {
  padding: 2px 9px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  color: var(--text);
  background: var(--bg-surface);
  font: inherit;
  font-size: var(--fs-small);
  cursor: pointer;
}
.pill:hover { background: var(--bg-hover); text-decoration: none; }
.pill:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* min-height reserves the chips' height pre-load so the sticky bar doesn't
   grow (and shift the table) when the legend populates. */
.legend { display: flex; flex: 0 1 auto; flex-wrap: wrap; gap: 6px; min-width: 0; min-height: 23px; }
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  color: var(--text);
  font: inherit;
  font-size: var(--fs-small);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  user-select: none;
  background: var(--bg-surface);
}
.legend-item:hover { background: var(--bg-hover); }
.legend-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.legend-item.off { opacity: 0.4; }
.legend-item .count { color: var(--text-muted); font-variant-numeric: tabular-nums; }

/* --- Table --- */
table { width: 100%; border-collapse: collapse; }
#index { table-layout: fixed; }
col.col-video { width: 140px; }
#index[data-density="large"] col.col-video { width: 260px; }
col.col-status { width: 98px; }
col.col-guesses { width: 112px; }
col.col-constraint { width: 136px; }
thead th {
  background: var(--bg-header);
  text-align: left;
  font-weight: bold;
  font-size: var(--fs-small);
  padding: 7px 10px;
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}
/* The index header tracks the sticky controls bar; other tables stick to their
   own scroll container (see .stats-table in stats.css). */
#index thead th { position: sticky; top: var(--sticky-controls-height); z-index: 10; }
th[data-sort] { cursor: pointer; }
th[data-sort]:hover { color: var(--color-primary-dark); }
th[data-sort]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}
th.sorted::after { content: " \25B2"; }
th.sorted.desc::after { content: " \25BC"; }

tbody td { padding: 6px 10px; border-bottom: 1px solid #eee; vertical-align: middle; }
tbody tr:hover { background: var(--bg-hover); }

.col-num, .num { text-align: right; font-variant-numeric: tabular-nums; }
td.col-num { color: var(--text); }
td.col-num.na { color: var(--text-muted); }
.stat-main { font-variant-numeric: tabular-nums; white-space: nowrap; }
.stat-sub { font-size: 0.85em; color: var(--text-muted); line-height: 1.2; }
/* Solution-count qualifier — sits last (below the numbers), so the values read first. */
.qual-label { font-style: italic; font-size: 0.85em; margin-top: 1px; }
td.col-num .qual-label { white-space: nowrap; }

/* Puzzle cell */
.puzzle-title-row { display: flex; align-items: center; gap: 7px; }
.puzzle-title-row a { display: inline-flex; align-items: center; flex: none; }
.source-links { display: inline-flex; align-items: center; gap: 5px; flex: none; }
.puzzle-title { font-weight: bold; }
.puzzle-author { color: var(--text-muted); font-size: var(--fs-small); }
.puzzle-author.inline { white-space: nowrap; }
.author-filter {
  border: 0;
  padding: 0;
  font: inherit;
  color: var(--color-primary-dark);
  background: none;
  cursor: pointer;
}
.author-filter:hover { text-decoration: underline; }
.author-filter:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 3px; }
tr[data-density="medium"] .chips {
  max-height: 58px;
  overflow-y: auto;
  overflow-x: hidden;
}
tr[data-density="medium"] .chips.overflowing {
  -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 12px), transparent);
  mask-image: linear-gradient(to bottom, #000 calc(100% - 12px), transparent);
}
tr[data-density="compact"] .puzzle-title-row {
  width: 100%;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}
tr[data-density="compact"] .puzzle-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
tr[data-density="compact"] .chips {
  display: block;
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  width: 100%;
  max-width: 100%;
  height: 24px;
  white-space: nowrap;
}
tr[data-density="compact"] .chips.overflowing {
  -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 18px), transparent);
  mask-image: linear-gradient(to right, #000 calc(100% - 18px), transparent);
}
tr[data-density="compact"] .chips-clip {
  display: block;
  position: absolute;
  inset: 0;
  overflow: visible;
  width: 100%;
  min-width: 0;
  text-overflow: clip;
  white-space: nowrap;
}
tr[data-density="compact"] .chip { display: inline-block; margin-right: 4px; }
.chip {
  padding: 0 6px;
  border-radius: 10px;
  font: inherit;
  font-size: 11px;
  cursor: pointer;
  background: hsl(var(--tag-hue, 210) 55% 96%);
  color: hsl(var(--tag-hue, 210) 20% 40%);
  border: 1px solid hsl(var(--tag-hue, 210) 40% 84%);
}
.chip:hover { border-color: hsl(var(--tag-hue, 210) 45% 62%); }
.chip:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

/* Status badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: var(--fs-small);
  white-space: nowrap;
  border: 1px solid transparent;
}
.badge .dot { font-size: 11px; }
.badge.ok { background: hsl(140 60% 95%); color: var(--status-ok); border-color: hsl(140 45% 82%); }
.badge.warn { background: hsl(28 90% 95%); color: var(--status-warn); border-color: hsl(28 80% 82%); }
.badge.bad { background: hsl(12 75% 95%); color: var(--status-bad); border-color: hsl(12 60% 84%); }
.badge.idle { background: hsl(210 15% 95%); color: var(--status-idle); border-color: var(--border); }

/* Video cell (favicons or thumbnail, + date) and Constraint (stacked ISS actions). */
.col-video { text-align: center; }
.favicons { display: flex; align-items: center; justify-content: center; gap: 8px; }
.favicons a { display: inline-flex; align-items: center; }
.favicon { width: 16px; height: 16px; border-radius: 3px; flex-shrink: 0; }
.video-date { font-size: var(--fs-small); color: var(--text-muted); margin-top: 3px; text-align: center; }

/* Thumbnails-on variant: a thumbnail (the video link itself, replacing the plain
   YouTube favicon) with a subtle play affordance. */
#index[data-density="medium"] { --thumb-w: 120px; --thumb-h: 68px; }
#index[data-density="large"] { --thumb-w: 240px; --thumb-h: 135px; }
.thumb-link {
  position: relative;
  display: block;
  width: var(--thumb-w);
  margin: 0 auto 4px;
}
.thumb-link::before,
.thumb-link::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s, transform 0.12s;
}
.thumb-link::before {
  width: 24px;
  height: 18px;
  border-radius: 5px;
  background: rgba(0, 0, 0, 0.34);
  transform: translate(-50%, -50%);
}
.thumb-link::after {
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 7px solid rgba(255, 255, 255, 0.86);
  transform: translate(-35%, -50%);
}
.thumb-link:hover::before,
.thumb-link:hover::after,
.thumb-link:focus-visible::before,
.thumb-link:focus-visible::after { opacity: 0.82; }
.thumb-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.thumb-link:hover::before { background: rgba(0, 0, 0, 0.46); }
.thumb-link:focus-visible::before { background: rgba(0, 0, 0, 0.46); }
.thumb-link:hover::before { transform: translate(-50%, -50%) scale(1.04); }
.thumb-link:focus-visible::before { transform: translate(-50%, -50%) scale(1.04); }
.thumb {
  display: block;
  width: var(--thumb-w);
  height: var(--thumb-h);           /* 16:9, matching YouTube thumbnails */
  object-fit: cover;
  border-radius: 4px;
  background: var(--bg-header);      /* placeholder colour while it loads */
}

.iss-links { display: flex; flex-direction: column; gap: 4px; align-items: flex-start; }
.iss-row { display: flex; align-items: center; gap: 6px; }
.iss-links .iss-link { justify-content: center; min-width: 3.6em; }
.iss-row .size { color: var(--text-muted); font-size: 11px; font-variant-numeric: tabular-nums; white-space: nowrap; }
/* The size is why Solve is disabled — colour it as the visible reason. */
.iss-row .size.oversized { color: var(--status-oversized); font-weight: bold; }
.iss-link {
  font-size: var(--fs-small);
  font-family: inherit;
  padding: 1px 9px;
  border: 1px solid var(--color-primary);
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  white-space: nowrap;
  cursor: pointer;                 /* the Script action + modal Copy are <button>s */
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.iss-link:disabled { opacity: 0.5; cursor: default; }
/* Solve = primary: filled blue button. */
.iss-link:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); text-decoration: none; }
/* Script = secondary: blue outline — still obviously a button, not greyed out. */
.iss-link.script { background: var(--bg-surface); color: var(--color-primary-dark); }
.iss-link.script:hover { background: var(--bg-hover); border-color: var(--color-primary-dark); }
.iss-link.error {
  background: var(--bg-surface);
  color: var(--text-muted);
  border-color: var(--border);
  text-decoration: line-through;
  pointer-events: none;
}
/* Disabled action (e.g. Solve when the .iss is too big for a URL) — muted, keeps
   its tooltip (so no pointer-events:none), not clickable. */
.iss-link.disabled {
  background: var(--bg-surface);
  color: var(--text-muted);
  border-color: var(--border);
  cursor: default;
}

/* --- Script modal --- */
body.modal-open { overflow: hidden; }
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.5);
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: min(820px, 100%);
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}
.modal-head, .modal-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px;
}
.modal-head { border-bottom: 1px solid var(--border); }
.modal-foot { border-top: 1px solid var(--border); }
.modal-title {
  font-size: var(--fs-base); font-weight: 600; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.modal-close {
  border: none; background: none; cursor: pointer;
  font-size: 15px; color: var(--text-muted); line-height: 1; padding: 4px;
}
.modal-close:hover { color: var(--text); }
/* The code panel is the Prism "Tomorrow" theme (dark bg + syntax colours, as in
   ISS); override only the layout so it sits flush inside the modal. */
pre.modal-code { flex: 1; min-height: 0; margin: 0; }
.modal-hint { font-size: var(--fs-small); }
.modal-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* The pre-load "Loading…" message (and load failures) share the empty-state
   styling and position, so data arriving reads like a filter change. */
.empty.error { color: var(--status-bad); }

.empty {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  padding: var(--gap);
}
.empty[hidden] { display: none; }

/* Floating back-to-top button — appears once the list is a couple of screens deep. */
.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: var(--bg-surface);
  color: var(--text);
  font: inherit;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}
.to-top:hover { background: var(--bg-hover); }
.to-top:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.to-top[hidden] { display: none; }

/* Narrow screens: drop status label + chips to keep the row compact. */
@media (max-width: 640px) {
  :root { --page-x: var(--gap); }
  .badge .label { display: none; }
  .chips { display: none; }
  body { padding: var(--gap) var(--page-x); }
}