:root{--brand:#22181c;--accent:#b45309;--soft:#fcfaf7;--ink:#161214;--muted:#6e5f64;--line:#dbe4ec;--paper:#fff;--bg:#f6f8fb}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Noto Sans Devanagari,Mangal,Arial,sans-serif;line-height:1.65}.wrap{width:min(1160px,calc(100% - 28px));margin:auto}.site-header{position:sticky;top:0;z-index:5;background:#ffffffef;border-bottom:1px solid var(--line);padding:12px 0}.header-inner{display:flex;justify-content:space-between;gap:12px;align-items:center}.brand{font-weight:900;color:var(--brand)}.brand small{display:block;color:var(--muted);font-weight:600}.back{color:var(--brand);font-size:.85rem}.hero{padding:28px 0 20px}.breadcrumb{color:var(--muted);font-size:.8rem}.hero h1{color:var(--brand);line-height:1.3}.lead{color:#6e5f64}.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;position:sticky;top:65px;z-index:4;background:var(--bg);padding:10px 0}.tab{border:1px solid var(--line);background:var(--paper);padding:12px 8px;border-radius:9px;font-weight:800;color:var(--brand);cursor:pointer}.tab.active{background:var(--brand);color:#fff}.panel{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px;margin:12px 0}.hidden{display:none!important}.notes-section,.revision-box{border-top:3px solid var(--accent);padding:18px 0}.notes-section h2,.revision-box h2{color:var(--brand)}h3{color:var(--accent)}ul{padding-left:24px}.callout{padding:12px 15px;margin:14px 0;border-left:4px solid var(--accent);background:var(--soft);border-radius:6px}.callout.trap{background:#fff7ed;border-color:#c2410c}.callout.exam{background:#fcf1f5;border-color:#5c1d3d}.summary-intro{background:var(--soft);padding:16px;border-radius:9px}.glossary-grid{display:grid;gap:10px}.glossary-item{display:flex;gap:10px;border-bottom:1px solid var(--line);padding:8px 0}.comparison-row{padding:12px;border:1px solid var(--line);border-radius:8px;margin:10px 0}.comparison-row span{margin:0 8px;color:var(--muted)}.question{border:1px solid var(--line);border-radius:10px;padding:16px;margin:14px 0;background:#fff}.question-number,.question-type{display:inline-block;margin-right:8px;color:var(--accent);font-weight:900}.question-type{font-size:.78rem;background:var(--soft);padding:3px 8px;border-radius:999px}.options{display:grid;gap:8px}.option{display:flex;gap:10px;text-align:left;padding:11px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer;font:inherit}.option:hover{border-color:var(--accent)}.option b{color:var(--accent)}.answer-input{width:100%;padding:11px;border:1px solid var(--line);border-radius:7px;font:inherit;margin:6px 0;min-height:46px}.check-btn,.submit{background:var(--brand);color:#fff;border:0;border-radius:7px;padding:10px 14px;font-weight:800;cursor:pointer}.feedback{margin-top:10px}.source{display:none}.result{padding:16px;background:var(--soft);border-radius:9px;margin-top:14px}@media(max-width:700px){.tabs{grid-template-columns:repeat(2,1fr);top:58px}.tab{font-size:.78rem}.header-inner{align-items:flex-start;flex-direction:column}}