/* ══════════════════════════════════════════════════════════════════
   migrate-batch4.css — Batch 4 tools (Nov 2026)
   Area Calculator · Calorie Calculator · JSON Formatter ·
   Lorem Ipsum Generator · MathKit · Negative Marks Calculator ·
   YouTube Thumbnail Downloader
   LIGHT THEME ONLY — uses site.css variables. No dark backgrounds.
   ══════════════════════════════════════════════════════════════════ */

[hidden]{display:none !important}

/* ── shared: pill tabs (shape / type switchers) ── */
.b4-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.b4-tab{border:1px solid var(--line);background:var(--surface);color:var(--ink-soft);
  border-radius:999px;padding:9px 16px;font:600 14px/1 var(--font-body);cursor:pointer;
  transition:border-color .15s,background .15s,color .15s,box-shadow .15s}
.b4-tab:hover{border-color:var(--cyan);color:var(--cyan)}
.b4-tab.active{background:linear-gradient(135deg,#06b6d4,#2563eb);border-color:transparent;color:#fff;
  box-shadow:0 4px 14px rgba(37,99,235,.35)}

/* ── shared: segmented control (male/female, metric/imperial) ── */
.b4-seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--line);
  border-radius:12px;padding:4px;gap:4px}
.b4-seg-btn{border:0;background:transparent;color:var(--muted);font:600 14px/1 var(--font-body);
  padding:9px 16px;border-radius:9px;cursor:pointer;transition:background .15s,color .15s,box-shadow .15s}
.b4-seg-btn.active{background:var(--surface);color:var(--ink);box-shadow:0 1px 4px rgba(15,23,43,.14)}

/* ── shared: error + info boxes ── */
.b4-err{display:none;background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;
  border-radius:12px;padding:12px 14px;font-size:14px;line-height:1.55;margin:0 0 14px}
.b4-err.visible{display:block}
.b4-err code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;
  background:#fee2e2;border-radius:6px;padding:1px 6px}
.b4-note{background:#f0f9ff;border:1px solid #bae6fd;color:#075985;border-radius:12px;
  padding:12px 14px;font-size:14px;line-height:1.6;margin:0 0 14px}
.b4-note strong{color:#0c4a6e}

/* ── shared: key/value rows (results detail) ── */
.b4-kv2{display:grid;grid-template-columns:1fr 1fr;gap:0 22px;margin-top:16px}
.b4-kv{display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  padding:10px 2px;border-top:1px solid var(--line);font-size:15px}
.b4-kv .b4-k{color:var(--muted)}
.b4-kv .b4-v{font-weight:700;color:var(--ink);text-align:right}

/* ── shared: formula strip ── */
.b4-formula{text-align:center;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:16px;font-weight:600;color:var(--ink-soft);background:var(--bg-soft);
  border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:0 0 16px}
.b4-formula small{display:block;font-family:var(--font-body);font-size:13px;font-weight:500;
  color:var(--muted);margin-top:4px}

/* ── shared: action button row ── */
.b4-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.b4-actions .btn{flex:1 1 auto;justify-content:center;min-width:130px}

/* ── shared: toast (light) ── */
.b4-toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,80px);z-index:999;
  background:var(--surface);color:var(--ink);border:1px solid var(--line);
  border-left:4px solid var(--green);border-radius:12px;padding:12px 18px;font-size:14.5px;font-weight:600;
  box-shadow:0 12px 32px rgba(15,23,43,.18);opacity:0;pointer-events:none;
  transition:transform .25s ease,opacity .25s ease;max-width:calc(100vw - 32px);text-align:center}
.b4-toast.show{transform:translate(-50%,0);opacity:1}

/* ── shared: related-card text (site.css styles .rel-card itself) ── */
.b4-rel{flex-direction:column;align-items:flex-start;gap:4px}
.b4-rel .rel-t{font-weight:700;font-size:15px;color:var(--ink)}
.b4-rel .rel-desc{font-weight:400;font-size:13.5px;color:var(--muted);line-height:1.5}

/* ── shared: output textarea ── */
.b4-output{width:100%;min-height:220px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:14px;line-height:1.6;background:var(--bg-soft);border:1px solid var(--line);
  border-radius:12px;padding:14px;color:var(--ink)}
.b4-output:focus{outline:2px solid color-mix(in srgb,var(--cyan) 45%,transparent);border-color:var(--cyan)}

/* ══ AREA CALCULATOR (.ac-) ══ */
.ac-shape-icon{font-size:44px;line-height:1;text-align:center;margin:2px 0 4px}
.ac-dims{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ac-unit-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

/* ══ CALORIE CALCULATOR (.cc-) ══ */
.cc-goals{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}
.cc-goal{background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--cyan);
  border-radius:14px;padding:16px;text-align:center}
.cc-goal--lose{border-top-color:var(--cyan)}
.cc-goal--keep{border-top-color:var(--violet)}
.cc-goal--gain{border-top-color:var(--amber)}
.cc-goal .g-lbl{font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--muted)}
.cc-goal .g-val{font-size:26px;font-weight:800;color:var(--ink);margin:6px 0 2px}
.cc-goal .g-sub{font-size:13px;color:var(--muted);line-height:1.45}
.cc-macros{margin-top:18px}
.cc-macro{margin-bottom:12px}
.cc-macro .m-head{display:flex;justify-content:space-between;font-size:14px;margin-bottom:6px}
.cc-macro .m-head b{color:var(--ink)}
.cc-macro .m-head span{color:var(--muted)}
.cc-bar-track{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden}
.cc-bar-fill{height:100%;border-radius:999px;transition:width .4s ease}
.cc-bar-fill--protein{background:linear-gradient(90deg,#06b6d4,#2563eb)}
.cc-bar-fill--carbs{background:linear-gradient(90deg,#8b5cf6,#6f4fe8)}
.cc-bar-fill--fat{background:linear-gradient(90deg,#f59e0b,#d97706)}

/* ══ JSON FORMATTER (.jf-) ══ */
.jf-work{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
.jf-pane{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px}
.jf-pane h2{margin:0 0 12px;font-size:17px}
.jf-editor{width:100%;min-height:280px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:14px;line-height:1.6;background:var(--bg-soft);border:1px solid var(--line);
  border-radius:12px;padding:14px;color:var(--ink)}
.jf-editor:focus{outline:2px solid color-mix(in srgb,var(--cyan) 45%,transparent);border-color:var(--cyan)}
.jf-stats{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:12px;font-size:13.5px;color:var(--muted)}
.jf-stats b{color:var(--ink)}
.jf-status{font-weight:700}
.jf-status.ok{color:var(--green)}
.jf-status.bad{color:var(--red)}

/* ══ LOREM IPSUM (.li-) ══ */
.li-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.li-check{display:flex;align-items:center;gap:9px;font-size:15px;color:var(--ink-soft);cursor:pointer}
.li-check input{width:18px;height:18px;accent-color:var(--cyan);cursor:pointer}
.li-count-out{font-weight:700;color:var(--cyan)}

/* ══ MATHKIT (.mk-) ══ */
.mk-calc{max-width:460px;margin:0 auto}
.mk-display{background:var(--bg-soft);border:1px solid var(--line);border-radius:16px;
  padding:16px 18px;margin-bottom:14px;text-align:right;min-height:96px;
  display:flex;flex-direction:column;justify-content:center;gap:4px;overflow:hidden}
.mk-expr{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:16px;
  color:var(--muted);min-height:22px;word-break:break-all}
.mk-result{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:34px;
  font-weight:700;color:var(--ink);word-break:break-all;line-height:1.15}
.mk-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.mk-key{border:1px solid var(--line);background:var(--surface);color:var(--ink);
  border-radius:12px;padding:14px 4px;font:600 18px/1 var(--font-body);cursor:pointer;
  transition:background .12s,border-color .12s,transform .05s}
.mk-key:hover{border-color:var(--cyan);background:#f0f9ff}
.mk-key:active{transform:scale(.96)}
.mk-key.fn{background:#f0f9ff;color:#0369a1;border-color:#bae6fd;font-size:15px}
.mk-key.op{background:#f5f3ff;color:#5b21b6;border-color:#ddd6fe;font-size:20px}
.mk-key.eq{background:linear-gradient(135deg,#06b6d4,#2563eb);border-color:transparent;color:#fff;font-size:20px}
.mk-key.clr{background:#fef2f2;color:#b91c1c;border-color:#fecaca}
.mk-key.wide4{grid-column:span 4}
.mk-result.err{color:var(--red);font-size:22px}
.mk-history{margin-top:18px}
.mk-history h3{font-size:15px;margin:0 0 8px;color:var(--muted);font-weight:700}
.mk-history ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.mk-history li{display:flex;justify-content:space-between;gap:10px;background:var(--bg-soft);
  border:1px solid var(--line-soft);border-radius:10px;padding:9px 12px;font-size:14px;cursor:pointer}
.mk-history li:hover{border-color:var(--cyan)}
.mk-history .h-expr{color:var(--muted);font-family:ui-monospace,Menlo,Consolas,monospace;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mk-history .h-res{color:var(--ink);font-weight:700;font-family:ui-monospace,Menlo,Consolas,monospace;white-space:nowrap}
.mk-history .h-empty{color:var(--faint);font-size:13.5px}

/* ══ NEGATIVE MARKS (.nm-) ══ */
.nm-meter{margin-top:16px}
.nm-meter .m-head{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);margin-bottom:6px}
.nm-meter .m-head b{color:var(--ink)}
.nm-meter .nm-track{height:12px;background:var(--surface-2);border-radius:999px;overflow:hidden}
.nm-meter .nm-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#06b6d4,#2563eb);transition:width .4s ease}
.nm-meter .nm-fill.low{background:linear-gradient(90deg,#f87171,#dc2626)}
.nm-meter .nm-fill.mid{background:linear-gradient(90deg,#fbbf24,#d97706)}

/* ══ YOUTUBE THUMBNAIL (.yt-) ══ */
.yt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;margin-top:18px}
.yt-thumb{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  display:flex;flex-direction:column}
.yt-thumb .yt-img{position:relative;background:var(--surface-2);aspect-ratio:16/9;display:block}
.yt-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.yt-thumb .yt-badge{position:absolute;top:8px;left:8px;background:rgba(15,23,43,.85);color:#fff;
  font-size:11.5px;font-weight:700;letter-spacing:.04em;padding:4px 8px;border-radius:999px}
.yt-thumb .yt-body{padding:12px 14px 14px;display:flex;flex-direction:column;gap:2px;flex:1}
.yt-thumb .yt-name{font-weight:700;font-size:15px;color:var(--ink)}
.yt-thumb .yt-dims{font-size:13px;color:var(--muted)}
.yt-thumb .btn{margin-top:10px}
.yt-missing{display:flex;align-items:center;justify-content:center;height:100%;min-height:110px;
  color:var(--faint);font-size:13.5px;padding:12px;text-align:center}
.yt-video-id{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;color:var(--muted);
  background:var(--bg-soft);border:1px solid var(--line);border-radius:8px;padding:6px 10px;
  display:inline-block;word-break:break-all}

/* ══ responsive ══ */
@media (max-width:760px){
  .jf-work{grid-template-columns:1fr}
  .b4-kv2{grid-template-columns:1fr}
  .cc-goals{grid-template-columns:1fr}
  .li-controls{grid-template-columns:1fr}
  .mk-keys{gap:6px}
  .mk-key{padding:12px 2px;font-size:16px}
  .mk-result{font-size:28px}
}
@media (max-width:520px){
  .ac-dims{grid-template-columns:1fr}
}