/* ── Post cards grid ───────────────────────────────────── */
    .cards-grid {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(320px,1fr));
      gap: 1.25rem;
    }
    .post-card {
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--r-lg); overflow: hidden; cursor: pointer;
      transition: border-color .22s, transform .2s, box-shadow .22s;
      text-decoration: none; color: inherit; display: flex; flex-direction: column;
    }
    .post-card:hover {
      border-color: var(--green-dim); transform: translateY(-2px);
      box-shadow: 0 8px 28px rgba(34,197,94,.08);
    }
    .card-img {
      height: 148px; background: linear-gradient(135deg, var(--bg-card), var(--bg-surface));
      display: flex; align-items: center; justify-content: center;
      position: relative; border-bottom: 1px solid var(--border); overflow: hidden;
    }
    .card-img-photo {
      width: 100%; height: 100%; object-fit: cover; display: block;
    }
    .card-img-icon { font-size: 2.4rem; opacity: .3; color: var(--green); }
    .card-chip {
      position: absolute; bottom: .65rem; left: .65rem;
      font-family: var(--font-mono); font-size: .62rem; color: var(--green);
      background: rgba(10, 13, 15, .82);
      padding: .18rem .5rem; border-radius: 3px; border: 1px solid var(--green-dim);
      letter-spacing: .06em; text-transform: uppercase;
    }
    html[data-theme="light"] .card-chip {
      background: rgba(255, 255, 255, .9);
      border-color: var(--border-mid);
    }
    .card-body { padding: 1.1rem; flex: 1; display: flex; flex-direction: column; }
    .card-meta { display: flex; align-items: center; gap: .6rem; margin-bottom: .6rem; }
    .tag-pill {
      font-family: var(--font-mono); font-size: .62rem; color: var(--green);
      background: var(--green-glow); border: 1px solid var(--green-dim);
      padding: .14rem .42rem; border-radius: 3px;
      text-transform: uppercase; letter-spacing: .05em;
    }
    .tag-pill-secondary {
      font-family: var(--font-mono); font-size: .62rem; color: var(--text-muted);
      background: transparent; border: 1px solid var(--border);
      padding: .14rem .42rem; border-radius: 3px;
      text-transform: uppercase; letter-spacing: .05em;
    }
    .tag-pill-overflow {
      font-family: var(--font-mono); font-size: .6rem; color: var(--text-muted);
      background: var(--bg-surface); border: 1px solid var(--border);
      padding: .1rem .38rem; border-radius: 3px;
    }
    /* Hit count badge on filter chips in Browse */
    .chip-count {
      display: inline-block; font-size: .58rem; color: var(--green);
      background: var(--green-glow); padding: 0 .3rem; border-radius: 2px; margin-left: .2rem;
    }
    .card-date { font-family: var(--font-mono); font-size: .62rem; color: var(--text-muted); }
    .card-title {
      font-family: var(--font-mono); font-weight: 700; font-size: 1rem;
      line-height: 1.3; margin-bottom: .5rem; letter-spacing: -.01em;
    }
    .card-excerpt { color: var(--text-dim); font-size: .88rem; line-height: 1.6; flex: 1; }
    .card-hw-list {
      display: flex; align-items: center; gap: .35rem; flex-wrap: wrap;
      margin-top: .55rem;
    }
    .card-hw-chip {
      font-family: var(--font-mono); font-size: .58rem;
      color: var(--cyan); border: 1px solid rgba(34,211,238,.3);
      background: rgba(34,211,238,.08); border-radius: 999px;
      padding: .1rem .45rem;
    }
    .card-foot {
      display: flex; align-items: center; justify-content: space-between;
      margin-top: .85rem; padding-top: .85rem; border-top: 1px solid var(--border);
    }
    .card-meta-row { display: flex; align-items: center; gap: .75rem; }
    .card-stat {
      font-family: var(--font-mono); font-size: .62rem; color: var(--text-muted);
      display: flex; align-items: center; gap: .3rem;
    }
    .diff-badge {
      font-family: var(--font-mono); font-size: .6rem; padding: .12rem .38rem;
      border-radius: 3px; text-transform: uppercase; letter-spacing: .05em;
    }
    .diff-beginner  { background: rgba(34,197,94,.1);  color: var(--green); border: 1px solid var(--green-dim); }
    .diff-intermediate { background: rgba(245,158,11,.1); color: var(--amber);  border: 1px solid rgba(245,158,11,.3); }
    .diff-advanced  { background: rgba(239,68,68,.1);  color: var(--red);   border: 1px solid rgba(239,68,68,.3); }
    .card-arrow { color: var(--green); font-size: .85rem; transition: transform .18s; }
    .post-card:hover .card-arrow { transform: translateX(3px); }

    /* Empty state */
    .empty-state {
      grid-column: 1/-1; text-align: center; padding: 4rem 1rem;
      font-family: var(--font-mono); font-size: .85rem; color: var(--text-muted);
    }
    .empty-state i { display: block; font-size: 2rem; margin-bottom: 1rem; color: var(--border-mid); }

    /* ── Search + Filter bar ───────────────────────────────── */
    .filter-bar {
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--r-lg); padding: 1.1rem 1.4rem;
      margin-bottom: 1.75rem; display: flex; flex-direction: column; gap: 1rem;
    }
    .search-row {
      display: flex; align-items: center; gap: .75rem; flex-wrap: wrap;
    }
    .search-field {
      position: relative; flex: 1;
      min-width: 220px;
    }
    .search-field input {
      width: 100%; background: var(--bg); border: 1px solid var(--border);
      border-radius: var(--r); color: var(--text); font-family: var(--font-mono);
      font-size: .82rem; padding: .6rem .9rem .6rem 2.4rem;
      outline: none; transition: border-color .2s;
    }
    .search-field input:focus { border-color: var(--green); }
    .search-field input::placeholder { color: var(--text-muted); }
    .search-field .fa-magnifying-glass {
      position: absolute; left: .75rem; top: 50%; transform: translateY(-50%);
      color: var(--text-muted); font-size: .78rem; pointer-events: none;
    }
    .search-clear {
      position: absolute; right: .7rem; top: 50%; transform: translateY(-50%);
      background: none; border: none; color: var(--text-muted); cursor: pointer;
      font-size: .75rem; display: none; padding: .2rem;
    }
    .search-clear.visible { display: block; }
    .search-clear:hover { color: var(--text); }

    .sort-wrap {
      display: flex;
      align-items: center;
      gap: .45rem;
      flex-wrap: nowrap;
    }
    .sort-label {
      font-family: var(--font-mono);
      font-size: .68rem;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: .05em;
    }
    .sort-dropdown {
      position: relative;
      min-width: 205px;
    }
    .sort-trigger {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--r);
      color: var(--text);
      font-family: var(--font-mono);
      font-size: .72rem;
      padding: .5rem .65rem;
      min-width: 205px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .6rem;
      outline: none;
      transition: border-color .18s, box-shadow .18s;
    }
    .sort-trigger .fa-chevron-down {
      transition: transform .18s ease;
      transform-origin: center;
    }
    .sort-trigger:focus,
    .sort-trigger[aria-expanded='true'] {
      border-color: var(--green);
      box-shadow: 0 0 0 2px var(--green-glow);
    }
    .sort-trigger[aria-expanded='true'] .fa-chevron-down {
      transform: rotate(180deg);
    }
    .sort-menu {
      position: absolute;
      top: calc(100% + .4rem);
      right: 0;
      min-width: 260px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--r);
      box-shadow: 0 14px 28px rgba(0, 0, 0, .32);
      padding: .35rem;
      z-index: 40;
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
      transform: translateY(6px) scale(.98);
      transform-origin: top right;
      transition: opacity .16s ease, transform .16s ease, visibility 0s linear .16s;
    }
    .sort-menu.open {
      opacity: 1;
      visibility: visible;
      pointer-events: auto;
      transform: translateY(0) scale(1);
      transition: opacity .16s ease, transform .16s ease;
    }
    .sort-option {
      width: 100%;
      text-align: left;
      background: transparent;
      border: 1px solid transparent;
      border-radius: var(--r);
      color: var(--text-dim);
      font-family: var(--font-mono);
      font-size: .72rem;
      padding: .5rem .55rem;
      cursor: pointer;
      transition: border-color .16s, color .16s, background-color .16s;
    }
    .sort-option:hover {
      color: var(--green);
      border-color: var(--green-dim);
      background: var(--green-glow);
    }
    .sort-option.active {
      color: var(--green);
      border-color: var(--green);
      background: var(--green-glow);
    }
    .sort-option.is-disabled {
      opacity: .55;
      cursor: not-allowed;
    }
    .sort-option.is-disabled:hover {
      color: var(--text-dim);
      border-color: transparent;
      background: transparent;
    }

    @media (prefers-reduced-motion: reduce) {
      .sort-trigger,
      .sort-trigger .fa-chevron-down,
      .sort-menu,
      .sort-menu.open,
      .sort-option {
        transition: none !important;
      }
      .sort-trigger[aria-expanded='true'] .fa-chevron-down {
        transform: none;
      }
      .sort-menu,
      .sort-menu.open {
        transform: none;
      }
    }

    .filter-chip-quiet {
      border-style: dashed;
      color: var(--text-muted);
      white-space: nowrap;
    }
    .clear-all-filters {
      opacity: 0;
      pointer-events: none;
      transform: translateY(-2px);
      transition: opacity .18s ease, transform .18s ease;
    }
    .clear-all-filters.visible {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }
    .clear-all-filters:disabled {
      opacity: 0;
      pointer-events: none;
    }

    @media (max-width: 680px) {
      .sort-wrap {
        width: 100%;
      }
      .sort-dropdown,
      .sort-trigger {
        flex: 1;
        min-width: 0;
      }
      .sort-menu {
        left: 0;
        right: 0;
        min-width: 0;
      }
    }

    .filter-row { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
    #tag-chips, #hw-chips { display: flex; align-items: center; gap: .45rem; flex-wrap: wrap; }
    .filter-label {
      font-family: var(--font-mono); font-size: .68rem;
      color: var(--text-muted); letter-spacing: .06em;
      text-transform: uppercase; margin-right: .25rem; flex-shrink: 0;
    }
    .filter-chip {
      font-family: var(--font-mono); font-size: .68rem;
      border: 1px solid var(--border); border-radius: 20px;
      padding: .22rem .7rem; cursor: pointer; transition: all .18s;
      background: none; color: var(--text-dim);
      display: flex; align-items: center; gap: .3rem;
    }
    .filter-chip:hover { border-color: var(--green-dim); color: var(--green); background: var(--green-glow); }
    .filter-chip.active { border-color: var(--green); color: var(--green); background: var(--green-glow); }
    .filter-chip.diff-chip-beginner.active     { border-color: var(--green); color: var(--green); }
    .filter-chip.diff-chip-intermediate.active { border-color: var(--amber); color: var(--amber); background: rgba(245,158,11,.08); }
    .filter-chip.diff-chip-advanced.active     { border-color: var(--red); color: var(--red); background: rgba(239,68,68,.08); }

    .results-count {
      font-family: var(--font-mono); font-size: .72rem;
      color: var(--text-muted); margin-left: auto; flex-shrink: 0;
    }
    .results-count span { color: var(--green); }

    /* ── Category cards ────────────────────────────────────── */
    .cats-grid {
      display: grid; grid-template-columns: repeat(auto-fill, minmax(170px,1fr));
      gap: 1rem;
    }
    .cat-card {
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: var(--r-lg); padding: 1.2rem 1.1rem;
      text-decoration: none; color: inherit; cursor: pointer;
      transition: border-color .2s, transform .18s;
      display: flex; flex-direction: column; gap: .5rem;
    }
    .cat-card:hover { border-color: var(--green-dim); transform: translateY(-1px); }
    .cat-card-icon { font-size: 1.4rem; line-height: 1; color: var(--green); }
    .cat-card-name { font-family: var(--font-mono); font-weight: 700; font-size: .9rem; }
    .cat-card-count { font-family: var(--font-mono); font-size: .64rem; color: var(--text-muted); }

    /* Pinned "Start Here" tutorial card on category pages */
    .pinned-card {
      display: block; text-decoration: none; color: inherit;
      background: linear-gradient(135deg, var(--bg-card), #0a140a);
      border: 1px solid var(--green-dim); border-radius: var(--r-lg);
      padding: 1.15rem 1.25rem; margin: 0 0 1.2rem;
      transition: border-color .2s, transform .18s, box-shadow .2s;
    }
    .pinned-card:hover {
      border-color: var(--green);
      transform: translateY(-1px);
      box-shadow: 0 10px 30px rgba(34,197,94,.08);
    }
    .pinned-label {
      font-family: var(--font-mono); font-size: .65rem; color: var(--green);
      letter-spacing: .07em; text-transform: uppercase;
      display: flex; align-items: center; gap: .4rem; margin-bottom: .5rem;
    }
    .pinned-title {
      font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem;
      line-height: 1.28; margin-bottom: .45rem;
    }
    .pinned-excerpt { color: var(--text-dim); font-size: .88rem; line-height: 1.6; margin-bottom: .75rem; }
    .pinned-meta { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }

    /* ── Category page header ──────────────────────────────── */
    .cat-page-head {
      padding: 2.5rem 0 2rem; display: flex; align-items: flex-start;
      justify-content: space-between; flex-wrap: wrap; gap: 1.5rem;
    }
    .cat-page-icon-block {
      display: flex; align-items: center; gap: 1rem;
    }
    .cat-big-icon {
      width: 56px; height: 56px; background: var(--bg-card);
      border: 1px solid var(--border); border-radius: var(--r-lg);
      display: flex; align-items: center; justify-content: center; font-size: 1.6rem;
    }
    .cat-page-title { font-family: var(--font-mono); font-weight: 800; font-size: 2rem; letter-spacing: -.02em; }
    .cat-page-desc { color: var(--text-dim); font-size: .9rem; margin-top: .3rem; }

    /* ── Breadcrumb ────────────────────────────────────────── */
    .breadcrumb {
      display: flex; align-items: center; gap: .5rem;
      font-family: var(--font-mono); font-size: .7rem;
      color: var(--text-muted); padding: 1.25rem 0 0; flex-wrap: wrap;
    }
    .breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color .18s; }
    .breadcrumb a:hover { color: var(--green); }
    .breadcrumb .sep { color: var(--border-mid); }
    .breadcrumb .cur { color: var(--text-dim); }

    /* ── Newsletter ────────────────────────────────────────── */
    .newsletter-band {
      background: linear-gradient(135deg, var(--bg-card), #0a140a);
      border: 1px solid var(--border); border-radius: var(--r-lg);
      padding: 2.5rem; text-align: center; max-width: 580px; margin: 0 auto;
    }
    .newsletter-band h3 {
      font-family: var(--font-mono); font-weight: 700;
      font-size: 1.3rem; letter-spacing: -.02em; margin-bottom: .4rem;
    }
    .newsletter-band p { color: var(--text-dim); font-size: .9rem; margin-bottom: 1.1rem; }
    .nl-form { display: flex; gap: .5rem; max-width: 380px; margin: 0 auto; }
    .nl-input {
      flex: 1; background: var(--bg); border: 1px solid var(--border-mid);
      border-radius: var(--r); color: var(--text); font-family: var(--font-mono);
      font-size: .78rem; padding: .6rem .9rem; outline: none; transition: border-color .2s;
    }
    .nl-input:focus { border-color: var(--green); }
    .nl-input::placeholder { color: var(--text-muted); }
    .nl-btn {
      background: var(--green); color: var(--bg); border: none;
      font-family: var(--font-mono); font-size: .76rem; font-weight: 700;
      padding: .6rem 1.1rem; border-radius: var(--r); cursor: pointer;
      transition: opacity .18s; white-space: nowrap;
    }
    .nl-btn:hover { opacity: .85; }

    /* ── Divider ───────────────────────────────────────────── */
    .divider { border: none; border-top: 1px solid var(--border); margin: 0; }