h1{font-size:clamp(24px,3vw,34px);line-height:1.1;margin:0 0 8px;letter-spacing:-.03em}
.subtitle{margin:0;color:var(--muted);font-size:14px;line-height:1.5}
.container{max-width:1280px;margin:auto;padding:22px 28px 44px}
.controls{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.toolbar-row{display:flex;gap:8px;align-items:center;flex-wrap:nowrap}
.search-box{position:relative;flex:1 1 0;min-width:100px;display:flex;align-items:center;transition:flex .25s ease}
.search-box svg{position:absolute;left:14px;width:18px;height:18px;fill:none;stroke:#525d6b;stroke-width:1.8}
.search-box input{width:100%;height:44px;border:1px solid var(--line);border-radius:9px;background:#fbfcfd;padding:0 45px 0 42px;outline:0;font:inherit;font-size:14px;color:var(--text);transition:border-color .15s,box-shadow .15s,background .15s}
.search-box input::placeholder{color:#64748b;opacity:1}
.search-box input:focus{border-color:#9aabef;box-shadow:0 0 0 3px var(--accent-soft);background:#fff}
.search-box kbd{position:absolute;right:12px;border:1px solid #cbd5e1;border-bottom-width:2px;border-radius:5px;color:#475569;font-size:11px;font-weight:600;padding:2px 6px;background:#fff}
.mode-switch-wrap{min-width:0;flex-shrink:0}
.filter-label{display:block;font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;font-weight:700;color:#475569;margin:0 0 5px 2px}
.mode-switch{height:40px;display:inline-flex;background:var(--surface-2);padding:2px;border-radius:8px;border:1px solid var(--line);box-sizing:border-box}
.mode-switch label{display:flex;align-items:center;cursor:pointer}
.mode-switch input{position:absolute;opacity:0}
.mode-switch span{display:inline-flex;align-items:center;height:100%;padding:0 12px;border-radius:6px;font-size:12px;font-weight:600;color:#475569;white-space:nowrap;user-select:none;transition:all .15s ease}
.mode-switch input:checked+span{background:#fff;color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08);font-weight:700}
.clear-btn{height:44px;border:1px solid var(--line);border-radius:9px;background:#fff;color:#374151;font:inherit;font-size:12px;font-weight:600;cursor:pointer;padding:0 13px;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;flex-shrink:0;transition:all .15s ease}
.clear-btn svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .2s ease}
.clear-btn:hover{border-color:#3157d5;color:var(--accent);background:#f8fafc}
.clear-btn:hover svg{transform:rotate(-45deg)}
.clear-btn:active{background:#edf2f7}
.filters-row{display:flex;gap:10px;align-items:flex-end;margin-top:14px}
.filter-grid{flex:1;display:flex;gap:10px}
.filter-group{flex:1;min-width:0}.filter-group label{display:block;font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;font-weight:700;color:#475569;margin:0 0 5px 2px}
.filter-group select{width:100%;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:0 32px 0 10px;color:var(--text);font:inherit;font-size:13px;outline:0;transition:border-color .15s,box-shadow .15s}.filter-group select:focus{border-color:#9aabef;box-shadow:0 0 0 3px var(--accent-soft)}
.results-head{display:flex;justify-content:space-between;align-items:center;padding:20px 3px 10px;font-size:13px}.muted,.sort-note{color:var(--muted);font-size:12px}
.table-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.question-table{width:100%;border-collapse:collapse;table-layout:fixed}
.question-table th{background:#fafbfc;color:#7b848e;font-size:10px;text-transform:uppercase;letter-spacing:.08em;text-align:left;font-weight:700;padding:11px 18px;border-bottom:1px solid var(--line)}
.question-table td{padding:17px 18px;border-bottom:1px solid var(--line);vertical-align:top}.question-table tr:last-child td{border-bottom:0}
.number-col{width:48px}.qcol{width:auto}.actions-col{width:104px;text-align:center}
.question-main{font-family:"Source Serif 4",Georgia,serif;font-size:16px;line-height:1.62;max-width:1020px}.question-main p{margin:.15em 0 .65em}.question-main p:last-child{margin-bottom:0}.question-main ol,.question-main ul{margin:.3em 0 .65em;padding-left:24px}.question-main img{display:block;max-width:min(100%,620px);max-height:480px;object-fit:contain;margin:12px 0;border:1px solid var(--line);border-radius:7px;background:#fff}.question-meta{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-top:11px;font-family:Inter,system-ui,sans-serif;font-size:12px;color:#7b848e;line-height:1.45}.meta-left{min-width:0}.meta-left span{display:inline-block}.meta-left span+span:before{content:"·";margin:0 7px;color:#b0b6bd}.meta-right{text-align:right;white-space:nowrap}.exam{font-weight:700;color:#4f5964;font-size:12.5px}.marks{margin-left:5px}
.ai-actions{display:grid;grid-template-columns:repeat(2,34px);gap:6px;justify-content:center;padding-top:1px}
.ai-btn{width:34px;height:34px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;display:inline-flex;align-items:center;justify-content:center;color:#334155;text-decoration:none;box-shadow:0 1px 2px rgba(15,23,42,.05);transition:all .15s ease;flex-shrink:0}
.ai-btn:hover{border-color:#94a3b8;background:#f8fafc;color:#0f172a;transform:translateY(-1px);box-shadow:0 2px 5px rgba(15,23,42,.08)}
.ai-btn:active{transform:translateY(0);box-shadow:none}
.ai-btn.copy-btn:hover{border-color:#94a3b8;color:#0f172a;background:#f8fafc}
.ai-btn.copy-img-btn:hover{border-color:#a5b4fc;background:#eef2ff;color:#4338ca}
.ai-btn.chatgpt{color:#1e293b}
.ai-btn.chatgpt:hover{border-color:#34d399;background:#f0fdf4;color:#059669}
.ai-btn.analysis-btn:hover{border-color:#93c5fd;background:#eff6ff;color:#2563eb}
.ai-btn svg{width:17px;height:17px;display:block;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.ai-btn.chatgpt svg{width:16px;height:16px;fill:currentColor;stroke:none}
.empty-state{text-align:center;padding:65px 20px}.empty-icon{font-size:30px;color:#a2aab3}.empty-state h2{font-size:17px;margin:10px 0 4px}.empty-state p{font-size:13px;color:var(--muted);margin:0 0 12px}
.site-footer{max-width:1280px;margin:auto;padding:0 28px 28px;display:flex;justify-content:space-between;color:#929aa3;font-size:10px}
.loading{text-align:center;color:var(--muted);padding:50px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:960px){.filters-row{flex-wrap:wrap}.mode-switch-wrap{width:100%}.mode-switch{width:100%}.mode-switch label{flex:1}.mode-switch span{justify-content:center;width:100%}}
@media(max-width:800px){.actions-col{width:112px}.header-inner{padding:26px 16px 22px}.container{padding:14px 12px 32px}.question-table th,.question-table td{padding:13px 12px}.question-main{font-size:15px}.actions-col{width:76px}}
/* Toolbar stays one row always; below 560px search collapses to icon, buttons go icon-only */
@media(max-width:560px){
  .toolbar-row{gap:6px;flex-wrap:wrap;justify-content:flex-start}
  /* Collapsed search — icon only, styled like the other toolbar icon buttons */
  .search-box{flex:0 0 40px;height:40px;overflow:hidden;cursor:pointer;border-radius:9px;border:1px solid var(--line);background:#fff}
  .search-box svg{left:50%;transform:translateX(-50%);transition:left .2s ease,transform .2s ease}
  .search-box input{opacity:0;pointer-events:none;transition:opacity .2s ease,border-color .15s,box-shadow .15s,background .15s}
  .search-box kbd{display:none}
  /* Expanded search — remove outer box, let the input's own border show */
  .search-box.search-open,
  .search-box:focus-within{flex:1 1 0;height:auto;overflow:visible;cursor:auto;border:none;background:transparent}
  .search-box.search-open input,
  .search-box:focus-within input{opacity:1;pointer-events:auto}
  .search-box.search-open svg,
  .search-box:focus-within svg{left:14px;transform:none}
  /* Full-width search: hide other controls when search is active */
  .toolbar-row.search-active .exam-select,
  .toolbar-row.search-active .bookmark-filter-btn,
  .toolbar-row.search-active .clear-btn{display:none}
  .toolbar-row.search-active .search-box{flex:1 1 100%}
  /* Icon-only buttons */
  .bookmark-filter-btn{position:relative;width:40px;height:40px;padding:0;justify-content:center}
  .bookmark-filter-btn>span:not(.bookmark-count){display:none}
  .bookmark-count{position:absolute;top:-5px;right:-5px;min-width:16px;height:16px;padding:0 4px;font-size:9px;border:2px solid var(--surface,#fff)}
  .clear-btn{width:40px;height:40px;padding:0;justify-content:center}
  .clear-btn>span{display:none}
  .exam-select{flex: 1 1 auto; height: 40px;}
  .exam-select select{height: 32px;}
  .filter-grid{flex-direction:column;width:100%}
  .filters-row{flex-direction:column;align-items:stretch}
  .print-btn{width:100%}
  .question-meta{align-items:center;flex-direction:row;gap:8px}
  .meta-left{display:none}
  .meta-right{text-align:right;margin-left:auto}
  .ai-actions{display:flex;flex-direction:column;align-items:center;gap:5px}
  .actions-col{width:54px}
  .ai-btn{width:30px;height:30px}
  .question-main img{max-height:360px}
  .site-footer{padding:0 12px 22px;flex-direction:column;gap:5px}
  .bookmark-btn{width:22px;height:22px}
  .bookmark-btn svg{width:13px;height:13px}
}
@media(max-width:400px){
  .exam-select>span{display:none}
  .exam-select{padding:0 4px 0 8px;gap:4px}
  .search-box input{font-size:13px}
}

/* Performance-oriented controls */
.exam-select{height:44px;border:1px solid var(--line);border-radius:9px;padding:0 8px 0 12px;display:flex;align-items:center;gap:8px;font-size:12px;font-weight:700;white-space:nowrap;background:#fff;flex-shrink:0;transition:border-color .15s,box-shadow .15s}
.exam-select:focus-within{border-color:#9aabef;box-shadow:0 0 0 3px var(--accent-soft)}
.exam-select>span{color:#475569;text-transform:uppercase;font-size:11px;letter-spacing:.05em;font-weight:700}
.exam-select select{height:34px;border:0;background:transparent;color:var(--text);font:inherit;font-weight:600;font-size:13px;outline:0;cursor:pointer;padding-right:16px}
.copy-btn,.copy-img-btn{cursor:pointer}
.copy-btn.copied,.copy-img-btn.copied{color:#2f7a50;border-color:#a9d5ba;background:#f0faf4}
.ai-btn.btn-loading{opacity:.6;pointer-events:none;cursor:wait}


/* v2: faster list + clearer controls */
.results-title{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.selection-summary{display:inline-flex;align-items:center;margin-left:8px;padding:4px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:11px;font-weight:700}
.master-sort{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:11px;font-weight:700}
.master-sort select{height:34px;border:1px solid var(--line);border-radius:8px;background:var(--surface);padding:0 30px 0 10px;color:var(--text);font:inherit;font-weight:600;outline:0}
.master-sort select:focus{border-color:#9aabef;box-shadow:0 0 0 3px var(--accent-soft)}
.number-col{width:48px;text-align:center!important}
.q-number{text-align:center!important;color:var(--muted);font-size:12px;font-weight:700;padding-left:10px!important;padding-right:10px!important}
.question-check{display:inline-grid;place-items:center;cursor:pointer;width:28px;height:28px;border-radius:7px}
.question-check input{position:absolute;opacity:0;pointer-events:none}
.checkmark{width:17px;height:17px;border:1.5px solid #aeb6c0;border-radius:5px;background:#fff;position:relative;transition:.12s}
.question-check:hover .checkmark{border-color:#8797b2}
.question-check input:checked+.checkmark{background:var(--accent);border-color:var(--accent)}
.question-check input:checked+.checkmark:after{content:"";position:absolute;left:5px;top:2px;width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.question-table tbody tr{content-visibility:auto;contain-intrinsic-size:220px}
.question-main sup,.question-main sub{line-height:0}
@media(max-width:520px){
  .results-head{align-items:flex-start;gap:10px;flex-direction:column}
  .master-sort{width:100%}.master-sort select{flex:1}
  .number-col{width:42px}
  .q-number{padding-left:5px!important;padding-right:5px!important}
}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,12px);opacity:0;pointer-events:none;background:#20252b;color:#fff;padding:9px 14px;border-radius:9px;font-size:12px;font-weight:700;box-shadow:0 8px 24px rgba(0,0,0,.16);transition:.18s ease;z-index:1000}.toast.show{opacity:1;transform:translate(-50%,0)}.toast.error{background:#a33b3b}

/* Bookmark star in column 1 */
.bookmark-btn{display:flex;align-items:center;justify-content:center;width:26px;height:26px;padding:0;border:none;border-radius:6px;background:transparent;color:#b0b6bd;cursor:pointer;transition:all .15s ease;margin:4px auto 0}
.bookmark-btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:all .15s ease}
.bookmark-btn:hover{color:#d4a017;background:rgba(212,160,23,.08)}
.bookmark-btn:hover svg{transform:scale(1.12)}
.bookmark-btn.active{color:#d4a017}
.bookmark-btn.active svg{fill:#d4a017;stroke:#d4a017;filter:drop-shadow(0 1px 3px rgba(212,160,23,.25))}
.bookmark-btn:active{transform:scale(.92)}

/* Practice button in column 1 */
.practice-btn{display:flex;align-items:center;justify-content:center;width:26px;height:26px;padding:0;border:none;border-radius:6px;background:transparent;color:#b0b6bd;cursor:pointer;transition:all .15s ease;margin:4px auto 0}
.practice-btn svg{width:16px;height:16px;transition:all .15s ease}
.practice-btn:hover{color:#475569;background:rgba(71,85,105,.08)}
.practice-btn:hover svg{transform:scale(1.12)}
.practice-btn.solved{color:#15803d}
.practice-btn.solved svg{filter:drop-shadow(0 1px 3px rgba(21,128,61,.25))}
.practice-btn.solved:hover{background:rgba(21,128,61,.08)}
.practice-btn.doubt{color:#d97706}
.practice-btn.doubt svg{filter:drop-shadow(0 1px 3px rgba(217,119,6,.25))}
.practice-btn.doubt:hover{background:rgba(217,119,6,.08)}
.practice-btn:active{transform:scale(.92)}

/* Bookmark filter toolbar button */
.bookmark-filter-btn{position:relative;height:44px;border:1px solid var(--line);border-radius:9px;background:#fff;color:#374151;font:inherit;font-size:12px;font-weight:600;cursor:pointer;padding:0 13px;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;flex-shrink:0;transition:all .15s ease}
.bookmark-filter-btn svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:all .15s ease}
.bookmark-filter-btn:hover{border-color:#d4a017;color:#b8860b;background:#fffef5}
.bookmark-filter-btn:hover svg{color:#d4a017}
.bookmark-filter-btn.active{border-color:#d4a017;background:linear-gradient(135deg,#fffdf5,#fff8e1);color:#8b6914;box-shadow:0 0 0 3px rgba(212,160,23,.1)}
.bookmark-filter-btn.active svg{fill:#d4a017;stroke:#d4a017}
.bookmark-count{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:#d4a017;color:#fff;font-size:10px;font-weight:800;line-height:1}


/* Print-friendly question sheet */
.print-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;border:1px solid #3157d5;background:#3157d5;color:#fff;border-radius:9px;padding:0 15px;font-size:12px;font-weight:700;letter-spacing:.01em;cursor:pointer;box-shadow:0 3px 10px rgba(49,87,213,.18);transition:.15s ease}.print-btn:hover{background:#2749b8;border-color:#2749b8;transform:translateY(-1px);box-shadow:0 5px 14px rgba(49,87,213,.22)}.print-btn:active{transform:translateY(0)}.print-btn:disabled{opacity:.65;cursor:wait;transform:none}.print-icon{font-size:17px;line-height:1}

/* Print-friendly question sheet */
.print-root{display:none}
@media print{
  @page{size:A4;margin:16mm 15mm 16mm 15mm}
  body > *:not(#printRoot){display:none!important}
  #printRoot{display:block!important;color:#111;background:#fff;font-family:Georgia,"Times New Roman",serif;font-size:11.5pt;line-height:1.45}
  .print-title{border-bottom:1px solid #bbb;padding-bottom:8pt;margin-bottom:12pt}
  .print-heading{text-align:center;margin-bottom:10pt}
  .print-heading strong{font-size:16pt;display:block}
  .print-filters{display:flex;justify-content:space-between;align-items:flex-end;margin-top:10pt;font-family:Arial,Helvetica,sans-serif;font-size:10pt;color:#111}
  .print-section-header{font-family:Arial,Helvetica,sans-serif;font-size:13pt;font-weight:bold;margin:15pt 0 10pt;border-top:1px solid #ddd;padding-top:10pt}
  .print-topic-header{font-family:Arial,Helvetica,sans-serif;font-size:11.5pt;font-weight:bold;margin:10pt 0 8pt;color:#333}
  .print-question{display:grid;grid-template-columns:24pt minmax(0,1fr);column-gap:5pt;margin:0 0 32pt;break-inside:avoid-page;page-break-inside:avoid}
  .print-number{font-weight:700;font-size:11.5pt;padding-top:1pt}
  .print-question-body{min-width:0}
  .print-question-body p{margin:0 0 6pt}
  .print-question-body img{display:block;max-width:100%;height:auto;max-height:120mm;object-fit:contain;margin:5pt 0 7pt;break-inside:avoid}
  .print-meta{margin-top:7pt;font-family:Arial,Helvetica,sans-serif;font-size:9pt;color:#333;text-align:right;padding-top:3pt}
  .print-question .MathJax{font-size:100%!important}
}

/* Analysis: client-side hybrid similarity panel */
.analysis-btn{cursor:pointer}
.analysis-btn[aria-expanded="true"]{color:var(--accent);border-color:#9aabef;background:var(--accent-soft)}
.analysis-row>td{padding:0!important;background:#fbfcff;border-bottom:1px solid var(--line)!important}
.analysis-card{margin:0 18px 18px;border:1px solid #dce3f2;border-radius:11px;background:#fff;box-shadow:0 5px 18px rgba(30,50,90,.05);overflow:hidden}
.analysis-card-head{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:15px 17px;background:linear-gradient(180deg,#f8faff,#fff);border-bottom:1px solid #e5e9f1}
.analysis-eyebrow{font-size:9px;letter-spacing:.13em;font-weight:800;color:var(--accent);margin-bottom:4px}
.analysis-card-head h3{margin:0;font-size:14px;letter-spacing:-.01em}
.analysis-status{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:11px;font-weight:600;white-space:nowrap}
.analysis-spinner{width:13px;height:13px;border:2px solid #dce2ed;border-top-color:var(--accent);border-radius:50%;animation:analysis-spin .75s linear infinite}
@keyframes analysis-spin{to{transform:rotate(360deg)}}
.analysis-results{padding:14px 17px 17px}
.analysis-summary{font-size:11.5px;color:var(--muted);line-height:1.5;margin-bottom:13px}
.analysis-summary strong{color:#4c5968}
.analysis-section{border:1px solid var(--line);border-radius:9px;overflow:hidden;margin-top:12px}
.analysis-section-title{display:flex;align-items:center;gap:8px;padding:9px 11px;background:#fafbfc;border-bottom:1px solid var(--line);font-size:10px;color:var(--muted);font-weight:700}
.analysis-badge{display:inline-flex;padding:4px 7px;border-radius:999px;font-size:8.5px;letter-spacing:.07em;font-weight:800}
.analysis-badge.exact{background:#eef8f1;color:#287449}
.analysis-badge.related{background:var(--accent-soft);color:var(--accent)}
.analysis-exact-question{padding:13px 14px 5px;font-size:14px;line-height:1.5}
.analysis-repeat-line{display:flex;flex-wrap:wrap;gap:7px 15px;padding:7px 14px 13px;color:#4f5964;font-size:11px}
.analysis-repeat-line strong{color:var(--text)}
.analysis-related-list{display:flex;flex-direction:column}
.analysis-related-item{padding:12px 13px;border-bottom:1px solid var(--line)}
.analysis-related-item:last-child{border-bottom:0}
.analysis-related-meta{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-bottom:7px;font-size:10px;color:var(--muted)}
.analysis-rank{display:grid;place-items:center;width:20px;height:20px;border-radius:6px;background:var(--surface-2);color:#68727e;font-weight:800}
.analysis-score{margin-left:auto;font-size:9.5px;font-weight:800;padding:2px 7px;border-radius:999px;white-space:nowrap}
.analysis-score.direct-repeat{color:#15803d;background:#f0fdf4;border:1px solid #bbf7d0}
.analysis-score.strong-overlap{color:#1d4ed8;background:#eff6ff;border:1px solid #bfdbfe}
.analysis-signal{padding:2px 5px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#68727e;font-size:8px;font-weight:700}
.analysis-related-question{font-size:13.5px;line-height:1.5;color:#28323c}
.analysis-related-question p{margin:.1em 0 .5em}
.analysis-related-question p:last-child{margin-bottom:0}
.analysis-related-question img,.analysis-exact-question img{max-width:min(100%,500px);max-height:250px}
.analysis-loading{display:flex;flex-direction:column;gap:5px;padding:10px 2px;color:var(--muted);font-size:11px}
.analysis-loading strong{color:#47525f;font-size:12px}
.analysis-error{padding:14px;border:1px solid #efcccc;border-radius:8px;background:#fff7f7;color:#a33b3b;font-size:11px}
.analysis-fallback{padding:8px 10px;margin-bottom:9px;border-radius:7px;background:#fff9ed;color:#80652f;font-size:10px;line-height:1.4}
.analysis-no-related{padding:14px;color:var(--muted);font-size:11px}
@media(max-width:520px){
  .analysis-card{margin:0 8px 10px}
  .analysis-card-head{align-items:flex-start;flex-direction:column;gap:8px}
  .analysis-status{white-space:normal}
  .analysis-results{padding:11px}
  .analysis-score{margin-left:0}
  .analysis-related-question{font-size:13px}
}
.analysis-marks{font-weight:800;color:var(--text);padding:2px 5px;border-radius:5px;background:var(--surface-2)}
.analysis-exact-question{font-size:14px;line-height:1.55}
.analysis-related-question{font-size:13.5px;line-height:1.55}

/* ── Solution toggle button ── */
.solution-toggle-btn{display:inline-flex;align-items:center;gap:5px;padding:3px 10px 3px 8px;border:1px solid #cbd5e1;border-radius:999px;background:#fff;color:#475569;font-family:Inter,system-ui,sans-serif;font-size:11px;font-weight:600;cursor:pointer;white-space:nowrap;transition:all .15s ease;flex-shrink:0;line-height:1.3}
.solution-toggle-btn:hover{border-color:#93c5fd;color:#2563eb;background:#eff6ff;transform:translateY(-1px);box-shadow:0 2px 6px rgba(37,99,235,.1)}
.solution-toggle-btn:active{transform:translateY(0);box-shadow:none}
.solution-toggle-btn.active{border-color:#93c5fd;color:#2563eb;background:linear-gradient(135deg,#eff6ff,#e8f0fe)}
.solution-toggle-btn.loading{opacity:.6;pointer-events:none;cursor:wait}
.solution-chevron{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;transition:transform .25s ease;flex-shrink:0}
.solution-toggle-btn.active .solution-chevron{transform:rotate(180deg)}
.solution-warning-icon{width:13px;height:13px;fill:none;stroke:#d97706;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* ── Solution drawer ── */
.solution-drawer{max-height:0;overflow:hidden;opacity:0;transition:max-height .3s ease,opacity .2s ease,margin .2s ease,padding .2s ease;margin:0;border-radius:0 0 9px 9px}
.solution-drawer.open{max-height:5000px;opacity:1;margin-top:12px;padding:14px 16px 16px;border:1px solid #dce3f2;border-radius:9px;background:linear-gradient(180deg,#f8faff,#fff);box-shadow:0 3px 12px rgba(30,50,90,.04)}
.solution-content{font-family:"Source Serif 4",Georgia,serif;font-size:14.5px;line-height:1.65;color:#1e293b}
.solution-content p{margin:.15em 0 .6em}
.solution-content p:last-child{margin-bottom:0}

/* Unavailable state */
.solution-unavailable{display:flex;align-items:center;gap:10px;font-family:Inter,system-ui,sans-serif;font-size:12.5px;color:#94a3b8;font-style:italic;padding:4px 0}
.solution-unavailable-icon{width:18px;height:18px;flex-shrink:0;color:#cbd5e1}

/* Review warning banner */
.solution-review-warning{display:flex;align-items:flex-start;gap:8px;margin-bottom:12px;padding:9px 12px;border-radius:8px;border:1px solid #fde68a;background:#fffbeb;font-family:Inter,system-ui,sans-serif;font-size:11px;line-height:1.45;color:#92400e}
.solution-review-warning svg{width:16px;height:16px;flex-shrink:0;fill:none;stroke:#d97706;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;margin-top:1px}

/* ── Solution mobile responsive ── */
@media(max-width:560px){
  .solution-toggle-btn{padding:3px 8px 3px 6px}
  .solution-drawer.open{padding:10px 12px 12px;margin-top:10px}
  .solution-content{font-size:13.5px}
}