/* Unit Converter — built on base.css tokens only */
.conv-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(270px,1fr);gap:1.5rem;align-items:start}
@media (max-width:920px){.conv-layout{grid-template-columns:1fr}}
.conv-card{padding:1.6rem}
.conv-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.1rem}
.conv-title{font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;color:var(--text2)}
.fav-btn{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--border);
  color:var(--text2);transition:.2s}
.fav-btn:hover{color:#fbbf24;border-color:rgba(251,191,36,.5)}

/* category chips — same pattern as the Calculator Directory */
.chips{display:flex;gap:.5rem;overflow-x:auto;padding-bottom:.7rem;margin-bottom:1.3rem;scrollbar-width:thin}
.chip-btn{flex:none;padding:.5rem 1.05rem;border-radius:999px;border:1px solid var(--border);
  background:var(--surface);font-size:.85rem;color:var(--text2);transition:.25s var(--ease);white-space:nowrap}
.chip-btn:hover{color:var(--text);border-color:var(--border2)}
.chip-btn.active{background:var(--grad);color:#fff;border-color:transparent}

.conv-pair{display:grid;grid-template-columns:1fr 1fr;gap:.9rem;align-items:end}
@media (max-width:480px){.conv-pair{grid-template-columns:1fr}}
.conv-field{display:flex;flex-direction:column;gap:.4rem;min-width:0}
.conv-field>label,.conv-field>.fld-label{font-size:.78rem;font-weight:600;color:var(--text2);letter-spacing:.04em;text-transform:uppercase}
.conv-input{width:100%;padding:.85rem 1rem;border-radius:12px;border:1px solid var(--border2);
  background:var(--bg2);color:var(--text);font-family:var(--mono);font-size:1.15rem;transition:.2s}
.conv-input:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}

.conv-swap{display:flex;justify-content:center;margin:.95rem 0}
.swap-btn{width:44px;height:44px;border-radius:50%;border:1px solid var(--border2);background:var(--surface);
  display:grid;place-items:center;color:var(--accent);transition:transform .35s var(--ease),border-color .25s,box-shadow .25s}
.swap-btn:hover{transform:rotate(180deg);border-color:var(--accent);box-shadow:0 0 0 4px var(--glow)}

.result-display{min-height:58px;display:flex;align-items:center;gap:.55rem;padding:.7rem 1rem;border-radius:12px;
  border:1px solid var(--border);background:var(--bg2);font-family:var(--mono);
  font-size:clamp(1.05rem,3.4vw,1.5rem);font-weight:600;overflow-wrap:anywhere}
.result-display .r-unit{font-size:.82rem;color:var(--text2);flex:none}
.result-display .empty{color:var(--text2);font-size:1rem}
.conv-equation{font-family:var(--mono);font-size:.8rem;color:var(--text2);margin-top:.85rem;min-height:1.3em}
.conv-actions{display:flex;gap:.7rem;margin-top:1.15rem;flex-wrap:wrap}
#copyBtn.ok{background:linear-gradient(135deg,#4ade80,#22c55e)}
.conv-hint{margin-top:.9rem;font-size:.8rem;color:var(--text2)}
.conv-hint kbd{font-family:var(--mono);font-size:.7rem;border:1px solid var(--border2);border-radius:5px;padding:.1rem .4rem}
.conv-note{margin-top:1.1rem;font-size:.82rem;color:var(--text2);display:flex;gap:.5rem;line-height:1.5}
.conv-warn{margin-top:.9rem;font-size:.85rem;color:#fbbf24;background:rgba(251,191,36,.08);
  border:1px solid rgba(251,191,36,.35);border-radius:10px;padding:.6rem .9rem}

/* searchable unit combobox */
.unit-box{position:relative;min-width:0}
.us-btn{width:100%;display:flex;align-items:center;gap:.6rem;padding:.85rem 1rem;border-radius:12px;
  border:1px solid var(--border2);background:var(--surface);font-weight:600;font-size:.95rem;transition:.2s}
.us-btn:hover{border-color:var(--accent)}
.us-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.us-abbr{font-family:var(--mono);font-size:.72rem;color:var(--text2);flex:none}
.us-btn>svg{flex:none;color:var(--text2);transition:transform .3s var(--ease)}
.unit-box.open .us-btn{border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.unit-box.open .us-btn>svg{transform:rotate(180deg)}
.us-pop{position:absolute;z-index:40;top:calc(100% + 6px);left:0;right:0;background:var(--surface);
  backdrop-filter:blur(18px);border:1px solid var(--border2);border-radius:12px;box-shadow:var(--shadow);overflow:hidden}
.us-search{width:100%;padding:.7rem .95rem;background:var(--bg2);border:0;border-bottom:1px solid var(--border);
  color:var(--text);font:inherit;font-size:.9rem}
.us-search:focus{outline:0}
.us-list{max-height:232px;overflow:auto;padding:.35rem}
.us-list li{display:flex;align-items:center;gap:.55rem;padding:.55rem .7rem;border-radius:9px;font-size:.9rem;cursor:pointer}
.us-list li small{font-family:var(--mono);font-size:.7rem;color:var(--text2)}
.us-list li em{margin-left:auto;font-style:normal;font-family:var(--mono);font-size:.66rem;color:var(--accent);opacity:.85}
.us-list li.act{background:var(--surface2);color:var(--accent)}
.us-list li.sel::before{content:"✓";font-size:.8rem;color:var(--accent);flex:none}
.us-empty{color:var(--text2);padding:.9rem;text-align:center;cursor:default}

/* side panels */
.conv-side{display:grid;gap:1.2rem}
.side-card{padding:1.3rem}
.side-card h3{display:flex;justify-content:space-between;align-items:center;font-size:1rem;margin-bottom:.9rem}
.side-card h3 button{font-size:.72rem;color:var(--text2);text-decoration:underline}
.side-card h3 button:hover{color:var(--accent)}
.side-list{display:grid;gap:.45rem}
.item{display:flex;align-items:center;gap:.5rem;width:100%;text-align:left;padding:.6rem .75rem;border-radius:10px;
  border:1px solid var(--border);background:var(--surface);font-size:.84rem;transition:.2s}
.item:hover{border-color:var(--accent);color:var(--accent)}
.item small{margin-left:auto;font-family:var(--mono);font-size:.66rem;color:var(--text2);flex:none}
.fav-row{display:flex;gap:.4rem}
.fav-row .item{flex:1}
.fav-del{width:34px;flex:none;border-radius:10px;border:1px solid var(--border);background:var(--surface);
  color:var(--text2);font-size:1rem;line-height:1;transition:.2s}
.fav-del:hover{color:#f87171;border-color:#f87171}
.side-empty{color:var(--text2);font-size:.85rem}

/* helpful content */
.conv-help{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;margin-top:3rem}
@media (max-width:820px){.conv-help{grid-template-columns:1fr}}
.help-card{padding:1.7rem}
.help-card h3{font-size:1.1rem;margin-bottom:1.1rem}
.help-steps{counter-reset:step;display:grid;gap:.75rem}
.help-steps li{counter-increment:step;position:relative;padding-left:2.3rem;font-size:.92rem;color:var(--text2)}
.help-steps li::before{content:counter(step);position:absolute;left:0;top:.05rem;width:1.65rem;height:1.65rem;
  border-radius:50%;background:var(--grad);color:#fff;display:grid;place-items:center;font-size:.75rem;font-weight:700}
.pop-grid{display:flex;flex-wrap:wrap;gap:.55rem}
.pop-btn{padding:.5rem .95rem;border-radius:999px;border:1px solid var(--border);background:var(--surface);
  font-family:var(--mono);font-size:.8rem;color:var(--text2);transition:.2s}
.pop-btn:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}