/* ---------- accessibility helpers (site-wide) ---------- */
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { outline-offset: 4px; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; background: var(--accent); color: var(--accent-ink); padding: 12px 16px; border-radius: var(--radius-sm); font-weight: 700; }
.skip-link:focus { top: 10px; }

/* ---------- tool notice banner ---------- */
.tool-notice { max-width: 1000px; margin: 20px auto; padding: 12px 16px; border: 1px solid var(--border); border-left: 3px solid var(--accent); background: var(--card); border-radius: var(--radius-sm); font-size: 0.875rem; color: var(--text-dim); }

/* ---------- homepage workspace layout ---------- */
.workspace { display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 32px; margin: 32px 0 60px; align-items: start; }

.tool-sidebar { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 14px; position: sticky; top: 90px; }
.sidebar-title { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; color: var(--text-faint); margin: 0 10px 14px; text-transform: uppercase; }
.category-title { margin-top: 26px; }
.side-filter { display: flex; align-items: center; justify-content: space-between; width: 100%; padding: 11px 12px; border: 0; background: transparent; color: var(--text-dim); font-size: 0.875rem; box-shadow: none; border-radius: var(--radius-sm); text-align: left; margin: 2px 0; font-weight: 500; gap: 6px; }
.side-filter:hover { background: var(--card-2); color: var(--text); transform: none; }
.side-filter.selected { background: var(--accent-soft); color: var(--accent); }
.side-filter small { font-size: 0.75rem; color: inherit; opacity: 0.75; font-family: var(--font-mono); }
.sidebar-note { margin: 30px 10px 0; border-top: 1px solid var(--border); padding-top: 18px; font-size: 0.875rem; color: var(--text-dim); }
.sidebar-note p { font-size: 0.82rem; color: var(--text-faint); margin: 7px 0 0; }
.status-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--success); margin: 0 6px; }

.tool-directory { padding: 8px 0; min-width: 0; }
.directory-topline { display: flex; justify-content: space-between; align-items: center; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; color: var(--text-faint); margin-bottom: 20px; text-transform: uppercase; }
.tool-directory h1 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); line-height: 1.15; margin: 0 0 14px; color: var(--text); }
.directory-intro { font-size: 1.02rem; color: var(--text-dim); margin: 0 0 26px; }

.directory-search { display: flex; align-items: center; gap: 14px; background: var(--card); border: 1px solid var(--border-strong); border-radius: var(--radius); padding: 0 18px; min-height: 60px; }
.directory-search label { display: flex; color: var(--text-faint); flex-shrink: 0; }
.directory-search svg { width: 20px; height: 20px; }
.directory-search input { border: 0; box-shadow: none; background: transparent; width: 100%; padding: 18px 0; min-width: 0; color: var(--text); }
.directory-search input:focus { outline: 0; box-shadow: none; }
.directory-search:focus-within { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.directory-search kbd { background: var(--bg-alt); color: var(--text-faint); border: 1px solid var(--border); padding: 2px 7px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.78rem; }

.quick-search { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 16px 0 34px; font-size: 0.85rem; color: var(--text-dim); }
.quick-search button { font-family: var(--font-mono); font-size: 0.78rem; padding: 5px 11px; border: 1px solid var(--border); background: var(--card); color: var(--text-dim); border-radius: 999px; box-shadow: none; font-weight: 600; }
.quick-search button:hover { color: var(--accent); border-color: var(--accent); filter: none; transform: none; }

.directory-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.directory-heading h2 { font-size: 1.3rem; margin: 0; }
.directory-heading p { font-size: 0.875rem; color: var(--text-faint); margin: 4px 0 0; font-family: var(--font-mono); }
.sort-label { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; color: var(--text-dim); }
.sort-label select { width: auto; background: var(--card); border: 1px solid var(--border); padding: 8px 11px; color: var(--text); font-size: 0.85rem; }

.directory-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.directory-card { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; color: var(--text); min-width: 0; transition: border-color .15s, transform .15s; }
.directory-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.card-symbol { height: 38px; min-width: 38px; border-radius: 9px; background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 1.05rem; font-weight: 700; }
.directory-card[data-type=text] .card-symbol { background: rgba(242,163,62,0.14); color: #f2a33e; }
.directory-card[data-type=convert] .card-symbol { background: rgba(63,201,180,0.14); color: #3fc9b4; }
.directory-card[data-type=calc] .card-symbol { background: rgba(74,201,138,0.14); color: #4ac98a; }
.directory-card[data-type=design] .card-symbol { background: rgba(224,95,160,0.14); color: #e05fa0; }
.directory-card[data-type=generate] .card-symbol { background: rgba(232,115,90,0.14); color: #e8735a; }
.directory-card[data-type=dev] .card-symbol { background: rgba(102,144,242,0.14); color: #6690f2; }
.card-category { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-faint); text-align: right; text-transform: uppercase; letter-spacing: 0.04em; }
.directory-card h3 { font-size: 1rem; line-height: 1.45; margin: 18px 0 8px; font-weight: 700; letter-spacing: -0.01em; overflow-wrap: anywhere; font-family: var(--font-body); }
.directory-card p { font-size: 0.875rem; line-height: 1.6; color: var(--text-dim); margin: 0 0 20px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-action { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; font-size: 0.85rem; font-weight: 700; color: var(--accent); }
.card-action span { font-size: 1.1rem; }

.load-more { display: block; margin: 30px auto 0; background: var(--card); border: 1px solid var(--border-strong); color: var(--text); box-shadow: none; padding: 12px 24px; }
.directory-empty { padding: 60px 20px; background: var(--card); border: 1px dashed var(--border-strong); text-align: center; border-radius: var(--radius); }
.directory-empty h3 { margin: 0 0 6px; }
.directory-empty p { color: var(--text-dim); }

@media (min-width: 1600px) {
  .directory-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
}
@media (max-width: 1150px) {
  .workspace { grid-template-columns: 210px minmax(0,1fr); gap: 22px; }
  .directory-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .sort-label { flex-direction: column; align-items: flex-start; gap: 2px; }
}
@media (max-width: 760px) {
  .workspace { display: block; margin-top: 20px; }
  .tool-sidebar { position: static; padding: 10px; display: flex; overflow-x: auto; gap: 6px; border-radius: var(--radius-sm); margin-bottom: 24px; }
  .tool-sidebar .sidebar-title, .sidebar-note { display: none; }
  .side-filter { width: auto; white-space: nowrap; flex-shrink: 0; padding: 10px 12px; }
  .side-filter small { display: none; }
  .tool-directory h1 { font-size: 1.9rem; }
  .directory-grid { gap: 12px; }
  .directory-card { padding: 16px; }
  .card-category { display: none; }
  .directory-heading { align-items: flex-start; }
  .directory-search kbd { display: none; }
}
@media (max-width: 430px) {
  .directory-grid { grid-template-columns: 1fr; }
  .directory-card p { -webkit-line-clamp: 2; }
  .card-category { display: block; }
  .directory-topline > span:last-child { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}