/* ===========================================================
   Tagda Timer — algorithm library page (algs.html)

   Loaded last, and only on that page. base.css locks the body so a solve
   cannot scroll the timer out from under you; a reference page is the one
   place in this app that genuinely is a document, so it takes the lock off
   for itself rather than weakening the rule for the timer.
   =========================================================== */

body.alglib-page {
  overflow: auto;
  overscroll-behavior: auto;
  background:
    radial-gradient(1200px 700px at 15% -10%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%),
    radial-gradient(900px 600px at 95% 8%, color-mix(in srgb, var(--accent-2) 8%, transparent), transparent 70%),
    var(--bg);
  padding: clamp(16px, 3.5vw, 40px) clamp(14px, 4vw, 48px) 72px;
}
body.alglib-page ::selection { background: color-mix(in srgb, var(--accent) 42%, transparent); }

#alglib-top, #alglib-events, #alglib-tabs, #alglib-bar, #alglib-grid, #alglib-foot {
  max-width: 1180px; margin-inline: auto;
}

/* ---------------- header ---------------- */
#alglib-top { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.alglib-title { min-width: 0; }
#alglib-top h1 { font-size: clamp(1.4rem, 3.2vw, 1.9rem); font-weight: 700; letter-spacing: -.025em; line-height: 1.1; }
#alglib-sub { color: var(--text-dim); font-size: .84rem; margin-top: 3px; min-height: 1.2em; }

.btn.back { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px 7px 8px; font-size: .78rem; flex: none; }
.btn.ghost { background: transparent; }
.btn.small { font-size: .76rem; padding: 7px 12px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------------- puzzle tabs ---------------- */
#alglib-events { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.event-tab {
  font-size: .82rem; font-weight: 600; letter-spacing: -.005em;
  padding: 7px 15px; border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  color: var(--text-dim);
  transition: color var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
}
.event-tab:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.event-tab.on { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.event-tab:focus-visible, .set-tab:focus-visible, .group-chip:focus-visible, .sel-btn:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* ---------------- set tabs, grouped by method ---------------- */
#alglib-tabs {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px;
  margin-bottom: 14px; padding-bottom: 12px;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}
.tab-group { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.tab-group-label {
  font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-right: 8px; padding: 3px 8px; border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.set-tab {
  font-size: .82rem; font-weight: 550;
  padding: 6px 11px; border-radius: 8px;
  border: 1px solid transparent; color: var(--text-dim);
  transition: color var(--dur-fast), background var(--dur-fast);
}
.set-tab:hover { color: var(--text); background: color-mix(in srgb, var(--surface) 80%, transparent); }
.set-tab.on {
  color: var(--accent); font-weight: 650;
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
}

/* ---------------- sticky bar: search, subset, selection ---------------- */
#alglib-bar {
  position: sticky; top: 8px; z-index: 5;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 16px; padding: 8px;
  border-radius: 14px; border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-2) 86%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 30px -22px rgba(0, 0, 0, .8);
}
#alglib-bar[hidden] { display: none; }

.alglib-search {
  display: flex; align-items: center; gap: 8px; flex: 1 1 180px; max-width: 280px;
  padding: 7px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--text-faint);
}
.alglib-search:focus-within { border-color: var(--accent); }
.alglib-search svg { flex: none; }
.alglib-search input { flex: 1; min-width: 0; border: 0; outline: 0; background: none; font-size: .82rem; color: var(--text); }
.alglib-search input::-webkit-search-cancel-button { filter: invert(.6); }

#alglib-groups { display: flex; gap: 4px; flex-wrap: wrap; }
#alglib-groups[hidden] { display: none; }
.group-chip {
  font-size: .76rem; padding: 6px 11px; border-radius: 8px;
  border: 1px solid var(--border); color: var(--text-dim);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
}
.group-chip:hover { color: var(--text); }
.group-chip.on { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 50%, transparent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.group-select {
  font-size: .8rem; padding: 7px 30px 7px 11px; border-radius: 10px;
  border: 1px solid var(--border); background-color: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--text); cursor: pointer;
}

#alglib-train { margin-left: auto; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.sel-count { font-size: .78rem; color: var(--text-dim); font-variant-numeric: tabular-nums; white-space: nowrap; }
.sel-count b { color: var(--text); font-weight: 700; }
.sel-actions { display: flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.sel-btn { font-size: .76rem; padding: 6px 11px; color: var(--text-dim); }
.sel-btn + .sel-btn { border-left: 1px solid var(--border); }
.sel-btn:hover { color: var(--text); background: color-mix(in srgb, var(--surface) 80%, transparent); }
.train-go { padding: 8px 16px; font-size: .82rem; font-weight: 650; white-space: nowrap; }

/* ---------------- case grid ---------------- */
#alglib-grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(176px, 1fr));
}
#alglib-grid[hidden] { display: none; }

/* A card is two buttons stacked: the picture selects, the algorithm strip
   opens. Separate hit areas with a visible seam, so the one you meant is the
   one you get. */
.case-card {
  position: relative;
  display: flex; flex-direction: column;
  border-radius: 14px; border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 62%, transparent);
  overflow: hidden;
  user-select: none; -webkit-user-select: none;
  transition: border-color var(--dur-fast), background var(--dur-fast), box-shadow var(--dur-fast);
}
.case-card:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.case-card.on {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  box-shadow: inset 0 0 0 1px var(--accent);
}

.case-pick {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  width: 100%; padding: 16px 12px 12px; text-align: center;
}
.case-pick:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; border-radius: 13px; }

.case-check {
  position: absolute; top: 10px; left: 10px;
  width: 20px; height: 20px; border-radius: 6px;
  border: 1.5px solid color-mix(in srgb, var(--text) 28%, transparent);
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  display: grid; place-items: center;
  transition: background var(--dur-fast), border-color var(--dur-fast);
}
.case-card:hover .case-check { border-color: var(--accent); }
.case-card.on .case-check { background: var(--accent); border-color: var(--accent); }
.case-card.on .case-check::after {
  content: ''; width: 10px; height: 5px;
  border-left: 2.2px solid var(--bg); border-bottom: 2.2px solid var(--bg);
  transform: translateY(-1px) rotate(-45deg);
}

.case-art { width: 104px; height: 104px; margin: 2px 0 8px; display: block; flex: none; }
.case-art.svg { display: flex; align-items: center; justify-content: center; }
.case-art.svg svg { width: 100%; height: 100%; }
.case-art.pyram { width: 118px; }
.case-art.sq1 { width: 150px; height: 74px; gap: 4px; }
.case-art.sq1 svg { width: 50%; height: auto; }
.case-art.big { width: clamp(132px, 26vw, 176px); height: clamp(132px, 26vw, 176px); margin: 0; }
.case-art.sq1.big { width: clamp(200px, 40vw, 280px); height: clamp(100px, 20vw, 140px); }

.case-name { font-size: .9rem; font-weight: 650; letter-spacing: -.01em; line-height: 1.25; }
.case-desc { font-size: .7rem; line-height: 1.35; color: var(--text-dim); }

.case-open {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 9px 10px 9px 12px; text-align: left;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-2) 50%, transparent);
  transition: background var(--dur-fast);
}
.case-open:hover { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.case-open:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.case-alg {
  flex: 1; min-width: 0;
  font-family: var(--font-mono); font-size: .68rem; color: var(--text-dim);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.case-more { font-size: .66rem; font-weight: 650; color: var(--accent); white-space: nowrap; }
.case-open svg { flex: none; width: 14px; height: 14px; color: var(--accent); stroke-width: 2.4; }

.case-flag {
  position: absolute; top: 11px; right: 10px;
  font-size: .54rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent-2); pointer-events: none;
}
.alglib-empty { grid-column: 1 / -1; color: var(--text-dim); font-size: .86rem; padding: 8px 2px; }
/* Read out by screen readers, never seen. */
.sr-status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* ---------------- detail ---------------- */
#alglib-detail { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 18px; align-items: stretch; }
#alglib-detail[hidden] { display: none; }
#alglib-detail .btn.back { align-self: flex-start; }

.case-head {
  display: flex; gap: 22px; align-items: flex-start; flex-wrap: wrap;
  padding: 18px; border-radius: 16px; border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 62%, transparent);
}
.case-head-art { display: grid; place-items: center; flex: none; }
/* `min-width` drops the text below the picture on a narrow screen rather than
   squeezing the setup into a column two words wide. */
.case-info { flex: 1; min-width: 260px; display: flex; flex-direction: column; gap: 4px; }
.case-kicker { font-size: .62rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--text-faint); }
.case-head h2 { font-size: 1.5rem; font-weight: 700; letter-spacing: -.02em; line-height: 1.15; }
.case-head .case-desc { font-size: .84rem; }
.case-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 10px; }

.setup-box {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: 14px; padding: 12px 14px; border-radius: var(--radius-sm);
  border: 1px solid color-mix(in srgb, var(--accent-2) 30%, transparent);
  background: color-mix(in srgb, var(--accent-2) 8%, transparent);
}
/* `display: flex` outranks the browser's own [hidden] rule. */
.setup-box[hidden] { display: none; }
.setup-head { display: flex; align-items: center; gap: 10px; }
.setup-head h3 { font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--text-dim); }
.setup-count { font-size: .7rem; font-family: var(--font-mono); color: var(--text-faint); }
.setup-copy { margin-left: auto; }
.setup-moves { font-family: var(--font-mono); font-size: .92rem; line-height: 1.5; word-spacing: .18em; overflow-wrap: anywhere; color: var(--accent-2); }
.setup-note { font-size: .72rem; line-height: 1.55; color: var(--text-dim); }

.alg-list-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-top: 4px; }
.alg-list-head h3 { font-size: .95rem; font-weight: 650; }
.alg-list-head .sub { font-size: .72rem; color: var(--text-faint); }
.alg-list-head .btn { margin-left: auto; }
.alg-list-head .btn[hidden] { display: none; }

.alg-list { display: flex; flex-direction: column; gap: 8px; }
.alg-list.dragging { cursor: grabbing; }
.alg-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  transition: border-color var(--dur-fast), background var(--dur-fast);
}
.alg-row.first { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.alg-row.dragging {
  position: relative; z-index: 3; cursor: grabbing;
  border-color: var(--accent); background: var(--surface-2); box-shadow: var(--shadow);
}
.alg-grip { flex: none; padding: 4px 2px; cursor: grab; color: var(--text-faint); touch-action: none; }
.alg-grip:hover { color: var(--text); }
.alg-grip svg { stroke-width: 2.8; }
.alg-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.alg-moves {
  font-family: var(--font-mono); font-size: .9rem; line-height: 1.45;
  word-spacing: .2em; overflow-wrap: anywhere; cursor: copy; color: var(--text);
}
.alg-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.alg-count { font-size: .7rem; color: var(--text-faint); font-family: var(--font-mono); }
.alg-badge { font-size: .56rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; padding: 2px 7px; border-radius: 99px; }
.alg-badge.first { color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent); }
.alg-badge.yours { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 15%, transparent); }
.alg-notes { font-size: .72rem; color: var(--text-dim); }
.alg-del { flex: none; width: 28px; height: 28px; border-radius: 8px; color: var(--text-faint); font-size: 1.1rem; line-height: 1; }
.alg-del:hover { color: var(--danger); background: color-mix(in srgb, var(--danger) 14%, transparent); }

.alg-add {
  padding: 14px; border-radius: 12px; border: 1px dashed var(--border);
  display: flex; flex-direction: column; gap: 10px;
}
.alg-add h3 { font-size: .78rem; font-weight: 650; color: var(--text-dim); }
.alg-add-row { display: flex; gap: 8px; flex-wrap: wrap; }
.alg-input {
  flex: 1; min-width: 200px;
  padding: 9px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: color-mix(in srgb, var(--bg-2) 70%, transparent);
  font-family: var(--font-mono); font-size: .82rem; outline: 0;
}
.alg-input:focus { border-color: var(--accent); }
.alg-error { font-size: .74rem; color: var(--danger); }
.alg-error[hidden] { display: none; }

/* ---------------- footer ---------------- */
#alglib-foot { margin-top: 36px; font-size: .74rem; line-height: 1.6; color: var(--text-faint); text-align: center; }
#alglib-foot b { color: var(--text-dim); font-weight: 650; }

/* ---------------- phones ---------------- */
@media (max-width: 640px) {
  #alglib-grid { grid-template-columns: repeat(auto-fill, minmax(146px, 1fr)); gap: 10px; }
  .case-art { width: 84px; height: 84px; }
  .case-art.pyram { width: 96px; }
  .case-art.sq1 { width: 124px; height: 62px; }
  .case-pick { padding: 14px 8px 10px; }

  /* Seven puzzles and thirteen 3x3 sets do not fit a phone in one row and
     should not try: both rows scroll sideways instead of becoming four rows of
     buttons above the thing you came to look at. */
  #alglib-events, #alglib-tabs {
    flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none;
    margin-inline: calc(-1 * clamp(14px, 4vw, 48px));
    padding-inline: clamp(14px, 4vw, 48px);
  }
  #alglib-events::-webkit-scrollbar, #alglib-tabs::-webkit-scrollbar { display: none; }
  .event-tab, .tab-group { flex: none; }
  .tab-group { flex-wrap: nowrap; }

  #alglib-bar { top: 4px; }
  .alglib-search { max-width: none; flex-basis: 100%; }
  #alglib-train { margin-left: 0; width: 100%; justify-content: space-between; }
  .train-go { flex: 1 1 auto; }
}