:root{--bg:#0d1626;--panel:#14203a;--panel-2:#1d2b48;--line:#2c3c5c;--text:#ece7db;--muted:#98a3b5;--brand:#c8973a;--brand-2:#e0b65c;--good:#3fae6f;--bad:#e8576b;--warn:#e2a93b;--radius:14px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}.app{max-width:720px;margin:0 auto;padding:20px 16px 80px}.header{justify-content:space-between;margin-bottom:18px}.header,.logo{display:flex;align-items:center}.logo{gap:9px;font-weight:800;font-size:22px;letter-spacing:-.5px}.logo span{color:var(--brand-2)}.logo-mark{width:30px;height:30px;flex:0 0 30px;display:block}.stats{display:flex;gap:14px;font-size:14px;color:var(--muted)}.stats b{color:var(--text)}.progress{height:8px;background:var(--panel-2);border-radius:99px;overflow:hidden;margin-bottom:18px}.progress>div{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand-2));transition:width .3s ease}.set-counter{font-size:12px;color:var(--muted);margin-bottom:12px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px}.tier-badge{display:inline-flex;gap:8px;align-items:center;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:12px}.tier-badge .dot{width:8px;height:8px;border-radius:99px;background:var(--brand)}.instruction{color:var(--muted);font-size:14px;margin:0 0 10px}.stimulus{font-size:20px;line-height:1.5;margin:0 0 18px}.stimulus .blank{color:var(--brand-2);font-weight:700}.sub-instruction{font-size:13px;color:var(--muted);margin:16px 0 8px}.step-head{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:600;color:var(--text);margin:0 0 12px}.step-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:99px;background:var(--brand);color:var(--bg);font-size:12px;font-weight:700;flex:0 0 22px}.step-2{margin-top:20px;padding:16px;background:var(--panel-2);border:1px solid var(--line);border-radius:12px;animation:stepIn .25s ease}@keyframes stepIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.options{display:grid;grid-gap:10px;gap:10px}.option{text-align:left;width:100%;background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:13px 15px;font-size:16px;cursor:pointer;transition:border-color .15s,background .15s,transform .05s}.option:hover{border-color:#3a4456}.option:active{transform:translateY(1px)}.option.correct{border-color:var(--good);background:rgba(47,191,113,.12)}.option.wrong{border-color:var(--bad);background:rgba(232,87,107,.12)}.option.dim{opacity:.55}.option:disabled{cursor:default}.explain{margin-top:16px;padding:13px 15px;background:var(--panel-2);border-left:3px solid var(--brand);border-radius:8px;font-size:14px;color:var(--text);line-height:1.5}.explain.good{border-left-color:var(--good)}.explain.bad{border-left-color:var(--bad)}.learn-link{display:inline-block;margin-top:10px;background:none;border:none;padding:0;font:inherit;font-size:13px;color:var(--brand-2);cursor:pointer;text-decoration:underline}.learn-link:hover{filter:brightness(1.12)}.flag-link{display:inline-block;margin:10px 0 0 16px;background:none;border:none;padding:0;font:inherit;font-size:13px;color:var(--muted);cursor:pointer;text-decoration:underline}.flag-link:hover{color:var(--warn)}.flag-link:disabled{color:var(--warn);cursor:default;text-decoration:none}.gate{max-width:380px;margin:12vh auto 0;text-align:center}.gate .logo{font-size:26px;margin-bottom:8px}.gate-sub{color:var(--muted);font-size:14px;margin:0 0 16px}.gate-err{color:var(--bad);font-size:13px;margin:10px 0 0}.flag-list{max-height:50vh;overflow-y:auto;margin:8px 0}.flag-row{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px;background:var(--panel-2)}.flag-meta{font-size:11px;color:var(--muted);font-family:ui-monospace,monospace}.flag-prompt{font-size:14px;margin:4px 0}.flag-ans{font-size:12px;color:var(--brand-2)}.flag-row .linklike{font-size:12px;margin-top:4px}.flag-json{width:100%;min-height:160px;margin:4px 0 10px;font-family:ui-monospace,monospace;font-size:12px;line-height:1.45}.input-row{display:flex;gap:10px}.text-input,.textarea{width:100%;background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:13px 15px;font-size:16px;font-family:inherit}.textarea{min-height:110px;line-height:1.5;resize:vertical}.text-input:focus,.textarea:focus{outline:none;border-color:var(--brand)}.btn{background:var(--brand);color:var(--bg);border:none;border-radius:10px;padding:12px 18px;font-size:15px;font-weight:600;cursor:pointer;transition:filter .15s,transform .05s}.btn:hover{filter:brightness(1.08)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:default}.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}.btn-row{display:flex;gap:10px;align-items:center;margin-top:18px}.spacer{flex:1 1}.hint{margin-top:12px;font-size:14px;color:var(--warn)}.hint 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auto}.radar-ring{fill:none}.radar-axis,.radar-ring{stroke:var(--line);stroke-width:1}.radar-band{fill:rgba(224,182,92,.12);stroke:none}.radar-value{fill:rgba(200,151,58,.32);stroke:var(--brand-2);stroke-width:2}.radar-dot{fill:var(--brand-2)}.radar-label{fill:var(--muted);font-size:10px}.summary{text-align:center}.summary h2{margin:4px 0 2px}.summary .sub{color:var(--muted);margin-bottom:10px}.gain{display:inline-flex;gap:18px;margin:12px 0}.gain div b{display:block;font-size:26px}.gain div span{font-size:12px;color:var(--muted)}.toast-wrap{position:fixed;left:0;right:0;bottom:24px;display:flex;justify-content:center;pointer-events:none}.toast{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:var(--bg);padding:14px 20px;border-radius:12px;font-weight:600;box-shadow:0 12px 40px rgba(200,151,58,.38);animation:pop .4s cubic-bezier(.2,1.3,.4,1)}.unlocks{display:grid;grid-gap:8px;gap:8px;margin:14px 0}.unlock-pill{background:var(--panel-2);border:1px solid var(--brand);border-radius:10px;padding:10px 14px;font-size:14px}@keyframes pop{0%{transform:translateY(20px) scale(.9);opacity:0}to{transform:none;opacity:1}}.gear{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:8px;width:34px;height:30px;font-size:15px;cursor:pointer}.gear:hover{color:var(--text);border-color:#3a4456}.linklike{background:none;border:none;color:var(--brand-2);cursor:pointer;padding:0;font:inherit;text-decoration:underline}.grade-mode{text-align:center;font-size:13px;color:var(--muted);margin:10px 0 4px}.grade-mode b{color:var(--text)}.skill-picker{display:flex;gap:10px;margin:4px 0 16px}.skill-tab{display:inline-flex;align-items:center;gap:8px;background:var(--panel);color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:8px 16px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:color .15s,border-color .15s,background .15s}.skill-tab:hover{color:var(--text);border-color:#3a4456}.skill-tab.on{color:var(--bg);background:var(--brand);border-color:var(--brand)}.skill-tab-count{font-size:11px;font-weight:700;opacity:.7}.skill-tab.on .skill-tab-count{opacity:.85}.mix-note{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:13px;color:var(--muted);line-height:1.5;margin:4px 0}.mix-note b{color:var(--text)}.tiermap{margin:16px 0 4px}.tiermap-head{font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);margin-bottom:10px}.tier-row{display:flex;gap:12px;padding:14px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:var(--panel)}.tier-row.off{opacity:.7}.tier-row.on{border-color:#4a3d22}.tier-ic{flex:0 0 26px;width:26px;height:26px;border-radius:99px;display:flex;align-items:center;justify-content:center;background:var(--panel-2);font-size:13px}.tier-row.on .tier-ic{background:rgba(47,191,113,.15);color:var(--good)}.tier-main{flex:1 1}.tier-title{font-weight:600;font-size:15px;display:flex;flex-wrap:wrap;gap:8px;align-items:baseline}.tier-count{font-weight:400;font-size:12px;color:var(--muted)}.tier-desc{font-size:13px;color:var(--muted);margin-top:3px}.tier-gate{font-size:12px;color:var(--warn);margin-top:8px}.tier-gate b{color:var(--text)}.gate-bar{height:6px;background:var(--panel-2);border-radius:99px;overflow:hidden;margin-top:6px}.gate-bar>div{height:100%;background:linear-gradient(90deg,var(--warn),var(--brand-2))}.lesson-cta{font-size:14px;margin:14px 0 2px;color:var(--muted)}.lesson-peek{margin-left:10px;font-size:12px}.modal.lesson{max-width:640px;max-height:86vh;overflow-y:auto}.lesson-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.lesson-head h3{margin:0 0 4px}.lesson-blurb{margin:0;font-size:13px;color:var(--muted);font-style:italic}.lesson-intro{font-size:14px;line-height:1.6;color:var(--text)}.lesson-sub{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin:18px 0 10px}.lesson-grid{width:100%;border-collapse:separate;border-spacing:6px;margin:6px 0;table-layout:fixed}.lesson-grid th{font-size:11px;color:var(--muted);font-weight:600;text-align:center;padding:2px}.lesson-grid th[scope=row]{text-align:right;padding-right:6px;white-space:nowrap}.lg-cell{width:100%;min-height:46px;cursor:pointer;background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:9px;padding:8px 6px;font:inherit;font-size:12px;line-height:1.3;transition:border-color .15s,background .15s}.lg-cell:hover{border-color:#3a4456}.lg-cell.on{border-color:var(--brand);background:rgba(200,151,58,.12);color:var(--brand-2);font-weight:600}.lg-detail{background:var(--panel-2);border-left:3px solid var(--brand);border-radius:8px;padding:12px 14px;margin-top:6px}.lg-detail-name{font-weight:700;font-size:14px}.lg-detail-ex{font-style:italic;color:var(--brand-2);margin:6px 0;font-size:15px}.lg-detail-use{font-size:13px;color:var(--muted);line-height:1.5}.pair-group{display:flex;gap:12px;align-items:baseline;padding:7px 0;border-bottom:1px solid var(--line)}.pair-group:last-child{border-bottom:none}.pair-head{flex:0 0 78px;color:var(--brand-2);font-size:14px;font-weight:700}.pair-items{font-size:13px;color:var(--text);line-height:1.5}.trigger{display:flex;gap:12px;align-items:baseline;padding:7px 0;border-bottom:1px solid var(--line)}.trigger:last-child{border-bottom:none}.trigger-mark{flex:0 0 150px;color:var(--brand-2);font-size:13px}.trigger-meaning{font-size:13px;color:var(--text)}.pitfall{padding:10px 0;border-bottom:1px solid var(--line)}.pitfall:last-child{border-bottom:none}.pf-wrong{color:var(--bad);font-size:14px}.pf-right{color:var(--good);font-size:14px;margin-top:2px}.pf-why{margin-top:4px;line-height:1.5}.lesson-foot,.pf-why{color:var(--muted);font-size:12px}.lesson-foot{margin-top:20px;padding-top:14px;border-top:1px solid var(--line);font-style:italic;text-align:center}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center;padding:20px;z-index:50}.modal{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px;width:100%;max-width:460px}.modal h3{margin:0 0 14px}.modal-label{font-size:13px;color:var(--muted);margin:0 0 8px}.modal-note{font-size:12px;color:var(--muted);line-height:1.5;margin:10px 0 0}