/* ── Puzzles Suite — page & tool styles ────────────────────────────
   Builds on css/shared.css design tokens (:root). LK Forge brand family
   (Orbitron display + Outfit body + JetBrains Mono numerics), with an
   red accent (#dc2626). 100% client-side — no network calls. */

:root {
  /* Suite brand accent (red) — overrides the indigo default from
     shared.css so this suite gets its own identity. */
  --accent:       #dc2626;
  --accent-h:     #b91c1c;
  --accent-bg:    #fef2f2;
  --accent-fg:    #991b1b;
  --accent-light: #f87171;
  --icon-bg:      #fecaca;
}

main { max-width: 860px; margin: 0 auto; padding: 20px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ── Page shell (hero / hub grid / section / faq / footer) ───────────────
   css/shared.css doesn't define these; ported from the sibling suite
   template (public/tools/productivity/css/productivity.css) so hub and
   tool pages in this suite render correctly. */
.tool-hero { max-width: 860px; margin: 0 auto; padding: 36px 20px 4px; }
.tool-hero .hero-head { display: flex; align-items: center; gap: 16px; }
.tool-hero .hero-icon {
  flex-shrink: 0; width: 52px; height: 52px; border-radius: 14px;
  background: var(--accent); display: flex; align-items: center; justify-content: center;
}
.tool-hero .hero-icon svg { width: 30px; height: 30px; stroke: #fff; fill: none; }
.tool-hero h1 { font-family: 'Orbitron', sans-serif; font-size: clamp(1.55rem, 4.2vw, 2.2rem); font-weight: 900; letter-spacing: -.5px; line-height: 1.2; }
.tool-hero .subtitle { color: var(--muted); font-size: 1.02rem; margin-top: 12px; max-width: 680px; }
.hub-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin: 8px auto 0; max-width: 1000px; padding: 0 24px 8px; }
@media (max-width: 880px) { .hub-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .hub-grid { grid-template-columns: 1fr; } }
.hub-card {
  position: relative; display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s, border-color .15s;
}
.hub-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow-lg); text-decoration: none; }
.hub-card .hub-tag { position: absolute; top: 18px; right: 18px; font-size: .72rem; font-weight: 700; color: var(--accent-fg); background: var(--accent-bg); padding: 2px 9px; border-radius: 999px; }
.hub-card .hub-icon { width: 52px; height: 52px; border-radius: 12px; background: var(--accent); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.hub-card .hub-icon svg { width: 27px; height: 27px; stroke: #fff; fill: none; }
.hub-card h2 { font-family: 'Orbitron', sans-serif; font-size: 1.15rem; font-weight: 700; color: var(--text); margin-bottom: 7px; }
.hub-card p { font-size: .9rem; color: var(--muted); line-height: 1.6; margin-bottom: 16px; }
.hub-card .hub-open { display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; font-weight: 700; color: var(--accent); }
.hub-note { max-width: 860px; margin: 4px auto 0; padding: 0 20px; color: var(--muted); font-size: .92rem; }
.section { max-width: 860px; margin: 16px auto; padding: 24px 20px; }
.section > h2 { font-family: 'Orbitron', sans-serif; font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.section > .section-sub { color: var(--muted); margin-bottom: 20px; }
.section-sub a { color: var(--accent); }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.faq summary { cursor: pointer; padding: 16px 18px; font-weight: 700; font-size: .98rem; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; float: right; color: var(--accent); font-weight: 700; }
.faq details[open] summary::after { content: '\2013'; }
.faq .faq-body { padding: 0 18px 16px; font-size: .92rem; color: var(--muted); line-height: 1.7; }
.faq .faq-body a { color: var(--accent); }
footer.page-footer { border-top: 1px solid var(--border); padding: 24px 20px; text-align: center; font-size: .82rem; color: var(--muted); margin-top: 24px; }
footer.page-footer nav { margin-bottom: 6px; }
footer.page-footer nav a { color: var(--muted); }
footer.page-footer nav a:hover { color: var(--text); }

/* Tool-specific maze generator styles are added in Task 5. */

@media print {
  body * { visibility: hidden; }
  .maze-wrap, .maze-wrap * { visibility: visible; }
  .maze-wrap { position: absolute; inset: 0; margin: 0; padding: 0; }
  #maze-canvas { width: 100% !important; height: auto !important; }
}

/* ── Tool controls & maze canvas layout ────────────────────────────
   Responsive grid for difficulty/size controls, centered canvas container,
   generic .is-hidden rule for show/hide toggle on custom-size inputs. */
.tool-controls { display: flex; flex-wrap: wrap; gap: .55rem; align-items: center; margin: 1.25rem 0; }

/* Single-toolbar tools (maze, sliding puzzle) have a fuller control row —
   widen the band so every control sits on one line on desktop, keeping hero,
   sections and stage aligned within the same band. Form-style tools
   (word search, brain teasers) keep the default 860 band. */
.wide-tool { max-width: 980px; }
.wide-tool .tool-hero,
.wide-tool .section { max-width: 980px; }
.wide-tool .tool-controls { gap: .45rem; }
.tool-controls label { display: inline-flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .9rem; color: var(--text); }
.maze-wrap { max-width: 640px; margin: 1rem auto; }
#maze-canvas { width: 100%; display: block; border: 1px solid var(--accent); border-radius: 8px; background: #fff; }
.is-hidden { display: none !important; }

/* ── Difficulty select + custom-size number inputs ──
   Native controls are re-skinned to match the button system: same radius,
   border weight, focus ring and red accent, with a custom SVG caret. */
.tool-controls select,
.tool-controls input[type="number"],
.ws-opts select,
.ws-opts input[type="text"],
.bt-controls select,
.bt-controls input[type="text"] {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  font: inherit; font-weight: 600; font-size: .9rem; color: var(--text);
  background: var(--surface); border: 1.5px solid var(--border); border-radius: 9px;
  padding: .55rem .85rem; line-height: 1.2; cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.tool-controls select,
.ws-opts select,
.bt-controls select {
  padding-right: 2.3rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23dc2626' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .75rem center; background-size: .72rem;
}
.tool-controls input[type="number"] { width: 4.4rem; text-align: center; cursor: text; }
.ws-opts input[type="text"],
.bt-controls input[type="text"] { cursor: text; }
.tool-controls select:hover,
.tool-controls input[type="number"]:hover,
.ws-opts select:hover,
.ws-opts input[type="text"]:hover,
.bt-controls select:hover,
.bt-controls input[type="text"]:hover { border-color: var(--accent-light); }
.tool-controls select:focus-visible,
.tool-controls input[type="number"]:focus-visible,
.ws-opts select:focus-visible,
.ws-opts input[type="text"]:focus-visible,
.bt-controls select:focus-visible,
.bt-controls input[type="text"]:focus-visible {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(220,38,38,.25);
}

/* ── Button system — shared base + primary / ghost / toggle variants ── */
.btn-primary, .btn-ghost, .btn-toggle {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  font: inherit; font-weight: 700; font-size: .9rem; line-height: 1.2;
  padding: .55rem 1.05rem; border-radius: 9px; cursor: pointer;
  border: 1.5px solid transparent; user-select: none;
  transition: transform .12s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn-primary:active, .btn-ghost:active, .btn-toggle:active { transform: translateY(1px); }
.btn-primary:focus-visible, .btn-ghost:focus-visible, .btn-toggle:focus-visible {
  outline: none; box-shadow: 0 0 0 3px rgba(220,38,38,.35);
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 1px 2px rgba(153,27,27,.25), 0 2px 8px rgba(153,27,27,.16);
}
.btn-primary:hover { background: var(--accent-h); transform: translateY(-1px); box-shadow: 0 2px 6px rgba(153,27,27,.3), 0 7px 18px rgba(153,27,27,.22); }
.btn-ghost {
  background: var(--surface); color: var(--accent-fg); border-color: var(--border);
  box-shadow: 0 1px 2px rgba(20,21,46,.05);
}
.btn-ghost:hover { background: var(--accent-bg); border-color: var(--accent-light); }
.btn-toggle { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-toggle:hover { background: var(--accent-bg); border-color: var(--accent-light); }
.btn-toggle input { width: 1rem; height: 1rem; margin: 0; cursor: pointer; accent-color: var(--accent); }
.btn-toggle:has(:checked), .btn-toggle[aria-pressed="true"] {
  background: var(--accent); color: #fff; border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(153,27,27,.22);
}
.btn-toggle:has(:checked) input { accent-color: #fff; }
#play-status { font-weight: 700; color: var(--accent); }
#maze-canvas:focus-visible { outline: 3px solid var(--accent-light); outline-offset: 2px; }

/* Play-mode keyboard hint — on-screen arrow symbols cue the physical arrow keys. */
.play-hint { max-width: 640px; margin: .6rem auto 0; display: flex; flex-direction: column; align-items: center; gap: .5rem; text-align: center; }
.play-hint-label { font-weight: 700; color: var(--accent-fg); font-size: .92rem; }
.play-hint-sub { font-size: .82rem; color: var(--muted); max-width: 40rem; line-height: 1.45; }
.keycap-pad { display: inline-flex; flex-direction: column; align-items: center; gap: 5px; }
.keycap-row { display: inline-flex; gap: 5px; }
.keycap { display: inline-flex; align-items: center; justify-content: center; min-width: 2.1rem; height: 2.1rem;
  border: 1px solid var(--accent); border-bottom-width: 3px; border-radius: 7px; background: var(--accent-bg);
  color: var(--accent-fg); font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 1.1rem; line-height: 1; }
@media (max-width: 480px) {
  .tool-controls { gap: .5rem; }
  .maze-wrap { max-width: 100%; }
}

/* ── Sliding Puzzle ── */
.sp-controls{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin:1.25rem 0}
.sp-source{display:flex;gap:.4rem}
.sp-source .sp-thumb{width:38px;height:38px;border-radius:8px;border:2px solid var(--border);
  background-size:cover;cursor:pointer;padding:0}
.sp-source .sp-thumb[aria-pressed="true"]{border-color:var(--accent)}
.sp-upload-label input{display:block;font-size:.85rem;max-width:190px}
.sp-stats{margin-left:auto;font-variant-numeric:tabular-nums;color:var(--muted)}
.sp-stage{display:flex;gap:1.25rem;flex-wrap:wrap;align-items:flex-start}
.sp-board{display:grid;gap:2px;width:min(460px,92vw);aspect-ratio:1;background:var(--border);
  border:3px solid var(--accent);border-radius:12px;overflow:hidden;touch-action:manipulation}
.sp-tile{border:0;padding:0;background-repeat:no-repeat;cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;
  font-weight:600;font-size:clamp(1rem,4vw,1.6rem);color:#fff;
  transition:filter .12s}
.sp-tile.is-blank{background:transparent;cursor:default;pointer-events:none}
.sp-tile:focus-visible{outline:3px solid var(--accent);outline-offset:-3px}
.sp-reference{margin:0;width:150px}
.sp-reference img{width:100%;border-radius:8px;border:1px solid var(--border)}
.sp-status{min-height:1.6rem;font-weight:700;color:var(--accent)}
.sp-board:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media (max-width:560px){.sp-stats{margin-left:0;width:100%}}

/* ── Word Search ── */
.ws-controls{display:flex;flex-direction:column;gap:.9rem;margin:1.25rem 0}
.ws-words-label{display:flex;flex-direction:column;gap:.35rem;font-weight:600;max-width:520px}
#ws-words{font-family:'JetBrains Mono',monospace;font-size:.95rem;padding:.6rem .7rem;border:1.5px solid var(--border);border-radius:10px;resize:vertical;background:var(--surface);color:var(--text)}
.ws-presets{display:flex;flex-wrap:wrap;gap:.4rem}
.ws-presets .ws-preset{padding:.35rem .7rem;border:1.5px solid var(--border);border-radius:100px;background:var(--surface2);cursor:pointer;font-size:.85rem;font-weight:600;color:var(--text)}
.ws-presets .ws-preset:hover{border-color:var(--accent)}
.ws-opts{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center}
.ws-opts label{display:inline-flex;align-items:center;gap:.35rem;font-weight:600}
.ws-message{color:#b91c1c;font-weight:600;min-height:0}
.ws-message:empty{display:none}
.ws-status{min-height:1.6rem;font-weight:700;color:var(--accent)}
.ws-stage{display:flex;gap:1.5rem;flex-wrap:wrap;align-items:flex-start;margin-top:.5rem}
.ws-grid{display:grid;gap:0;border:2px solid var(--accent);border-radius:8px;overflow:hidden;
  touch-action:none;user-select:none;-webkit-user-select:none}
.ws-cell{display:flex;align-items:center;justify-content:center;aspect-ratio:1;
  font-family:'JetBrains Mono',monospace;font-weight:600;font-size:clamp(.7rem,2.4vw,1.05rem);
  border:.5px solid var(--border);color:var(--text);background:var(--surface)}
.ws-cell.sel{background:var(--accent);color:#fffdf7}
.ws-cell.found{background:color-mix(in srgb,var(--accent) 55%,transparent);color:#fffdf7}
.ws-cell.answer{outline:2px solid var(--accent);outline-offset:-2px}
.ws-wordlist{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(90px,1fr));gap:.2rem .9rem;min-width:190px}
.ws-wordlist li{font-weight:600}
.ws-wordlist li.done{text-decoration:line-through;color:var(--muted)}
@media (max-width:560px){.ws-wordlist{grid-template-columns:repeat(2,1fr)}}
@media print{
  body *{visibility:hidden}
  #ws-print-area,#ws-print-area *{visibility:visible}
  #ws-print-area{position:absolute;left:0;top:0;width:100%}
  .ws-cell{border:.5px solid #000;color:#000;background:#fff}
  .ws-print-title[hidden]{display:none}
}

/* ── Sectioned nav + left rail (2026-08-16) — sections >=680, rail >=900 (200px). */
.nav-group { position: relative; display: none; align-items: center; }
.nav-group-btn { display: inline-flex; align-items: center; gap: 5px; font-family: inherit; font-size: .82rem; font-weight: 600; padding: 8px 12px; border: 1.5px solid var(--border); border-radius: var(--radius); color: var(--text); background: transparent; cursor: pointer; white-space: nowrap; transition: background .18s, border-color .18s, color .18s, transform .1s; }
.nav-group-btn .caret { font-size: .9em; transition: transform .18s; }
.nav-group-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.nav-group-btn[aria-expanded="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.nav-group-btn[aria-expanded="true"] .caret { transform: rotate(180deg); }
.nav-group.is-current .nav-group-btn { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.nav-group-menu { display: none; position: absolute; left: 0; top: calc(100% + 8px); flex-direction: column; gap: 2px; min-width: 210px; max-height: 76vh; overflow-y: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px; box-shadow: 0 10px 30px rgba(0,0,0,.14); z-index: 200; }
.nav-group.open .nav-group-menu { display: flex; }
@media (hover: hover) { .nav-group:hover .nav-group-menu { display: flex; } }
.nav-group-menu a { display: block; padding: 9px 12px; border-radius: 8px; font-size: .85rem; font-weight: 600; color: var(--text); white-space: nowrap; text-decoration: none; }
.nav-group-menu a:hover { background: var(--accent); color: #fff; text-decoration: none; }
.nav-group-menu a.active { background: var(--accent); color: #fff; }
.calc-layout { display: block; }
.calc-rail { display: none; }
.calc-content { min-width: 0; }
.rail-title { font-family: 'Orbitron', sans-serif; font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); padding: 6px 10px 4px; }
.rail-group { margin-top: 8px; }
.rail-group-label { font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); padding: 8px 10px 4px; }
.rail-link { display: block; padding: 8px 10px; border-radius: 8px; font-size: .86rem; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; text-decoration: none; }
.rail-link:hover { background: var(--surface2); text-decoration: none; }
.rail-link.active { background: var(--accent); color: #fff; }
@media (min-width: 680px) { .site-header .site-nav .nav-group { display: inline-flex; } }
@media (min-width: 900px) {
  .calc-layout { display: flex; align-items: flex-start; }
  .calc-rail { display: block; position: sticky; top: 57px; align-self: flex-start; flex: 0 0 200px; width: 200px; height: calc(100vh - 57px); overflow-y: auto; background: var(--surface); padding: 16px 12px 32px; }
  .calc-rail::-webkit-scrollbar { width: 8px; }
  .calc-rail::-webkit-scrollbar-track { background: transparent; }
  .calc-rail::-webkit-scrollbar-thumb { background: rgba(51, 65, 85, 0.35); border-radius: 999px; }
  .calc-rail.no-scroll::after {
    content: ""; position: absolute; top: 48px; right: 0; height: calc((100vh - 129px) / 4);
    width: 8px; border-radius: 999px; background: rgba(51, 65, 85, 0.22); pointer-events: none;
  }
  .calc-content { flex: 1 1 auto; }
}