:root{--bg:#f7f8fb;--surface:#fff;--ink:#172033;--muted:#657085;--line:#dde4ef;--brand:#2458d3;--brand-dark:#183b8c;--green:#16a875;--green-bg:#dcf8eb;--red:#d84d4d;--red-bg:#ffe6e6;--radius:8px}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button{font:inherit}.app-shell{grid-template-columns:248px 1fr;min-height:100vh;display:grid}.sidebar{color:#e9eef8;background:#101827;height:100vh;padding:22px 16px;position:sticky;top:0}.brand{align-items:center;gap:10px;margin-bottom:28px;display:flex}.brand-mark{width:38px;height:38px;color:var(--brand);background:#fff;border-radius:8px;place-items:center;font-weight:950;display:grid}.brand-name{font-weight:850;line-height:1.05}.brand-name span{color:#9fb4da;margin-top:4px;font-size:12px;font-weight:650;display:block}.side-nav{gap:6px;display:grid}.side-nav button{border-radius:var(--radius);color:#bac8df;text-align:left;cursor:pointer;background:0 0;border:0;min-height:42px;padding:0 12px;font-weight:750}.side-nav button.active{color:#fff;background:#23304b}.main{min-width:0}.topbar{z-index:5;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffe0;justify-content:space-between;align-items:center;min-height:72px;padding:14px 28px;display:flex;position:sticky;top:0}.mobile-brand{font-weight:900;display:none}.back-link{border:1px solid var(--line);border-radius:var(--radius);min-height:40px;color:var(--brand-dark);cursor:pointer;background:#fff;padding:0 13px;font-weight:850}.profile{align-items:center;gap:10px;display:flex}.avatar{color:#52380d;background:#ffd670;border-radius:50%;place-items:center;width:40px;height:40px;font-weight:900;display:grid}.profile small{color:var(--muted);font-weight:650;display:block}.content{max-width:1320px;margin:0 auto;padding:28px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 28px #182a4e0d}.category-grid,.set-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.category-card{border:1px solid var(--line);border-radius:var(--radius);min-height:154px;color:var(--ink);text-align:left;cursor:pointer;background:#fff;align-content:space-between;padding:16px;display:grid}.category-card.disabled{opacity:.46;cursor:default}.category-icon{border-radius:var(--radius);background:var(--brand);color:#fff;place-items:center;width:40px;height:40px;font-weight:950;display:grid}.category-card h2{margin:0;font-size:17px}.category-card p,.subcopy{color:var(--muted);font-size:14px;line-height:1.45}.status{color:var(--green);font-size:12px;font-weight:900}.panel-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:end;gap:18px;margin-bottom:20px;padding-bottom:18px;display:flex}.eyebrow{color:#137b86;margin-bottom:7px;font-size:13px;font-weight:850}h1{margin:0;font-size:26px;line-height:1.15}.summary{grid-template-columns:repeat(3,minmax(96px,1fr));gap:10px;min-width:320px;display:grid}.summary div{border-radius:var(--radius);background:linear-gradient(#fff,#f5f9ff);border:1px solid #dbe7f5;padding:12px}.summary strong{font-size:24px;display:block}.summary span{color:var(--muted);font-size:12px;font-weight:800}.set-card{border-radius:var(--radius);min-height:132px;color:inherit;text-align:left;cursor:pointer;background:linear-gradient(#fff 0%,#fbfdff 100%);border:1px solid #dbe4f0;align-content:space-between;gap:16px;padding:14px;display:grid;box-shadow:0 10px 24px #182a4e0f}.set-top{justify-content:space-between;align-items:center;gap:10px;display:flex}.set-title{align-items:center;gap:10px;display:flex}.set-number{border-radius:var(--radius);width:38px;height:38px;color:var(--brand-dark);background:#eaf4ff;place-items:center;font-weight:950;display:grid}.set-card h2{margin:0;font-size:16px}.meta-row{flex-wrap:wrap;gap:8px;display:flex}.meta-row span{color:var(--muted);background:#fff;border:1px solid #dce5f0;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:800}.start-btn{background:var(--brand);color:#fff;border-radius:999px;align-items:center;min-height:32px;padding:0 13px;font-size:12px;font-weight:900;display:inline-flex}.test-shell{background:#f7f9fd;min-height:100vh;padding-bottom:86px}.test-head{z-index:10;background:#eaf3ff;border-bottom:1px solid #cfdff4;place-items:center;min-height:84px;padding:16px;display:grid;position:sticky;top:0}.head-inner,.question-list{width:min(1120px,100% - 72px)}.head-inner{grid-template-columns:42px 1fr auto 42px;align-items:center;gap:8px;display:grid}.back-circle,.score-pill{width:40px;height:40px;color:var(--brand);background:#fff;border:1px solid #cfdbec;border-radius:50%;place-items:center;font-size:24px;font-weight:950;display:grid}.test-head h1{color:#173c9d;text-align:center;font-size:34px;font-weight:950}.text-size-control{min-height:36px;color:var(--brand-dark);background:#ffffffe6;border:1px solid #cfdbec;border-radius:999px;align-items:center;gap:8px;padding:0 10px;font-size:12px;font-weight:950;display:inline-flex}.text-size-control input{width:92px;accent-color:var(--brand)}.question-list{gap:16px;margin:24px auto 0;padding-bottom:18px;display:grid}.question-card{border:1px solid var(--line);background:#fbfcff;border-left:3px solid #2e83f0;border-radius:14px;padding:20px 28px 22px 94px;position:relative;box-shadow:0 10px 24px #182a4e0d}.question-number{color:#fff;background:linear-gradient(135deg,#2d7df0,#2868dc);border-radius:50%;place-items:center;width:42px;height:42px;font-weight:950;display:grid;position:absolute;top:20px;left:30px}.question-card h2{margin:0 0 16px;font-size:22px;line-height:1.26}.option-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 12px;display:grid}.option{color:#4d596c;cursor:pointer;text-align:left;background:#fff;border:1px solid #e0e7f0;border-radius:10px;align-items:center;gap:12px;min-height:44px;padding:9px 14px;font-size:18px;font-weight:750;display:flex}.option span{color:#6d7789;background:#edf2f8;border-radius:50%;flex:none;place-items:center;width:26px;height:26px;font-size:13px;font-weight:950;display:grid}.option.correct{background:var(--green-bg);color:#0d6f55;border-color:#6bdcba;font-weight:900}.option.correct span{background:var(--green);color:#fff}.option.wrong{background:var(--red-bg);color:#a73434;border-color:#f0a2a2;font-weight:900}.option.wrong span{background:var(--red);color:#fff}.test-footer{z-index:10;border-top:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff5;justify-content:center;align-items:center;min-height:68px;padding:8px 14px;display:flex;position:fixed;bottom:0;left:0;right:0}.footer-stats{grid-template-columns:repeat(4,1fr);gap:8px;width:min(720px,100%);display:grid}.footer-stat{background:#fff;border:1px solid #dce5f0;border-radius:12px;place-items:center;gap:2px;min-height:48px;display:grid;box-shadow:0 8px 20px #182a4e0f}.footer-stat strong{color:var(--ink);font-size:18px;font-weight:950;line-height:1}.footer-stat span{color:#8b96a6;font-size:11px;font-weight:850}.footer-stat.correct strong{color:var(--green)}.footer-stat.wrong strong{color:var(--red)}.bottom-nav{display:none}@media (width<=1080px){.app-shell{grid-template-columns:1fr}.sidebar{display:none}.mobile-brand{display:block}.category-grid,.set-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.panel-head{display:block}.summary{min-width:0;margin-top:14px}}@media (width<=720px){.topbar{padding:12px 16px}.profile>div:not(.avatar){display:none}.content{padding:16px 14px 78px}.panel{padding:16px}.category-grid,.set-grid{grid-template-columns:1fr}.summary{grid-template-columns:repeat(3,minmax(0,1fr))}.summary div{padding:10px}.summary strong{font-size:20px}.bottom-nav{z-index:20;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#0f172ac7;border-radius:22px;grid-template-columns:repeat(4,1fr);padding:6px;display:grid;position:fixed;bottom:12px;left:14px;right:14px}.bottom-nav button{color:#ffffff9e;background:0 0;border:0;min-height:54px;font-size:11px;font-weight:850}.bottom-nav .active{color:#fff}.test-shell{background:#fff;padding-bottom:76px}.test-head{background:#eaf3ff;border-bottom:1px solid #c9d9ef;min-height:88px;padding:8px 12px}.head-inner,.question-list{width:calc(100% - 28px)}.head-inner{grid-template-columns:1fr;justify-items:center;gap:7px}.back-circle,.score-pill{display:none}.test-head h1{letter-spacing:0;font-size:23px;line-height:1}.text-size-control{gap:6px;min-height:26px;padding:0 8px;font-size:10px}.text-size-control input{width:118px}.question-list{gap:12px;margin-top:18px;padding-bottom:92px}.question-card{background:#fbfcff;border-color:#e0e6ef;border-left-width:3px;border-radius:16px;min-height:auto;padding:14px 12px 14px 54px;box-shadow:0 6px 16px #192f520d}.question-number{width:30px;height:30px;font-size:10px;top:14px;left:12px;transform:none}.question-card h2{min-height:0;font-family:Nirmala UI,Latha,Inter,ui-sans-serif,system-ui,sans-serif;font-size:var(--test-question-size,15px);letter-spacing:0;margin:0 0 12px;font-weight:950;line-height:1.28}.option-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.option{min-height:38px;font-family:Nirmala UI,Latha,Inter,ui-sans-serif,system-ui,sans-serif;font-size:var(--test-option-size,12px);letter-spacing:0;border-radius:9px;gap:7px;padding:7px 9px;font-weight:760;line-height:1.16}.option span{width:20px;height:20px;font-size:7px}.test-footer{background:#fffffffa;min-height:68px;padding:8px 12px}.footer-stats{grid-template-columns:repeat(4,1fr);gap:6px;display:grid}.footer-stat{border:1px solid #dce5f0;min-height:48px;display:grid;box-shadow:0 8px 20px #182a4e0f}.footer-stat strong{font-size:16px}.footer-stat span{font-size:10px}}