:root{--clr-brand:#2563eb;--clr-brand-dark:#1d4ed8;--clr-brand-light:#eff6ff;--clr-brand-ring:#93c5fd;--clr-success:#16a34a;--clr-success-bg:#d1fae5;--clr-error:#dc2626;--clr-error-bg:#fee2e2;--clr-warning:#d97706;--clr-warning-bg:#fef3c7;--clr-accent:#6366f1;--clr-text:#1a1a1a;--clr-text-muted:#6b7280;--clr-text-faint:#9ca3af;--clr-border:#e5e7eb;--clr-border-soft:#f3f4f6;--clr-surface:#fff;--clr-surface-alt:#f9fafb;--clr-bg:#f8f9fa;--sp-1:0.25rem;--sp-2:0.5rem;--sp-3:0.75rem;--sp-4:1rem;--sp-5:1.25rem;--sp-6:1.5rem;--sp-8:2rem;--sp-10:2.5rem;--sp-12:3rem;--rad-sm:6px;--rad-md:10px;--rad-lg:16px;--rad-full:9999px;--font-body:"Inter","Segoe UI",system-ui,sans-serif;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--shadow-sm:0 1px 4px rgba(0,0,0,.06);--shadow-md:0 2px 12px rgba(0,0,0,.08);--subj-toan:#2563eb;--subj-toan-bg:#eaf1ff;--subj-ly:#16a34a;--subj-ly-bg:#e9f7ef;--subj-hoa:#7c3aed;--subj-hoa-bg:#f1ebfe;--subj-anh:#ef4444;--subj-anh-bg:#fdecec;--subj-sinh:#0d9488;--subj-sinh-bg:#e6f6f4;--lvl-de:#16a34a;--lvl-de-bg:#e9f7ef;--lvl-tb:#d97706;--lvl-tb-bg:#fef6e7;--lvl-kho:#ef4444;--lvl-kho-bg:#fdecec;--clr-purple:#7c3aed;--clr-teal:#0d9488;--clr-gold:var(--clr-gold,#f59e0b)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);color:var(--clr-text);background:var(--clr-bg);line-height:1.5}a{color:var(--clr-brand);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:900px;margin:0 auto;padding:0 var(--sp-4)}.site-nav{background:var(--clr-surface);border-bottom:1px solid var(--clr-border);padding:var(--sp-3) 0}body:has(.adm-app) .site-nav{display:none}body:has(.cat-nav) .site-nav{display:none}.site-nav-inner{max-width:900px;margin:0 auto;padding:0 var(--sp-4);display:flex;align-items:center;gap:var(--sp-6)}.site-nav .brand{font-weight:700;font-size:var(--text-base);color:var(--clr-text)}.page-header{padding:var(--sp-8) 0 var(--sp-6);margin-bottom:var(--sp-6)}.page-header h1{font-size:var(--text-2xl);font-weight:700;margin-bottom:var(--sp-1)}.page-header p{font-size:var(--text-sm)}.page-header p,.text-muted{color:var(--clr-text-muted)}.module-grid{display:grid;grid-gap:var(--sp-4);gap:var(--sp-4);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));padding-bottom:var(--sp-8)}.module-card{background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--rad-md);padding:var(--sp-5);cursor:pointer;transition:box-shadow .15s,border-color .15s;display:block;color:inherit}.module-card:hover{box-shadow:var(--shadow-md);border-color:#c7d2fe;text-decoration:none}.module-card h3{font-size:var(--text-sm);font-weight:600;margin-bottom:var(--sp-2);line-height:1.4}.module-meta{font-size:var(--text-xs);color:var(--clr-text-faint)}.question-card{background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--rad-md);padding:var(--sp-5);margin-bottom:var(--sp-4)}.question-header{display:flex;gap:var(--sp-2);margin-bottom:var(--sp-3);align-items:center;flex-wrap:wrap}.q-num{font-size:var(--text-sm);color:var(--clr-text-faint);min-width:1.5rem}.badge{font-size:var(--text-xs);padding:.15rem .55rem;border-radius:var(--rad-full);font-weight:600;letter-spacing:.01em}.badge-format{background:#dbeafe;color:#1d4ed8}.badge-biet{background:var(--clr-success-bg);color:#065f46}.badge-thong-hieu{background:var(--clr-warning-bg);color:#92400e}.badge-van-dung{background:var(--clr-error-bg);color:#991b1b}.question-stem{font-size:var(--text-sm);font-weight:500;line-height:1.55;margin-bottom:var(--sp-4)}.sub-items{list-style:none;flex-direction:column}.sub-item,.sub-items{display:flex;gap:var(--sp-2)}.sub-item{align-items:flex-start;font-size:var(--text-sm);line-height:1.45}.sub-item input{margin-top:.2rem;flex-shrink:0}.match-cols{grid-template-columns:1fr 1fr;grid-gap:var(--sp-4);gap:var(--sp-4)}.match-col-label{font-size:var(--text-xs);font-weight:600;color:var(--clr-text-faint);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--sp-2)}.match-list{list-style:none;display:flex;flex-direction:column;gap:var(--sp-2)}.match-item{background:var(--clr-border-soft);padding:.45rem var(--sp-3);border-radius:var(--rad-sm);font-size:var(--text-sm);line-height:1.4}.nhom-passage{background:var(--clr-surface-alt);border:1px solid var(--clr-border);border-left:3px solid var(--clr-accent);border-radius:var(--rad-sm);padding:var(--sp-4);font-size:var(--text-sm);line-height:1.65}.nhom-passage,.nhom-sub{margin-bottom:var(--sp-4)}.nhom-sub{padding-bottom:var(--sp-4);border-bottom:1px solid var(--clr-border-soft)}.nhom-sub:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.nhom-sub-stem{font-size:var(--text-sm);font-weight:500;margin-bottom:var(--sp-2)}.options-list{list-style:none;display:flex;flex-direction:column;gap:var(--sp-1)}.option-item{display:flex;gap:var(--sp-2);font-size:var(--text-sm);line-height:1.4}.option-item input{margin-top:.15rem;flex-shrink:0}.login-nudge{text-align:center;margin-top:var(--sp-6);padding:var(--sp-5);background:var(--clr-brand-light);border:1px dashed var(--clr-brand-ring);border-radius:var(--rad-md);color:#1d4ed8;font-size:var(--text-sm)}.prose h2{font-size:var(--text-lg);font-weight:700;margin:var(--sp-6) 0 var(--sp-3);color:#111}.prose h3{font-size:var(--text-base);font-weight:600;margin:var(--sp-5) 0 var(--sp-2)}.prose p{margin-bottom:var(--sp-3);line-height:1.7;font-size:var(--text-sm)}.prose ol,.prose ul{padding-left:var(--sp-6);margin-bottom:var(--sp-3)}.prose li{margin-bottom:var(--sp-1);line-height:1.65;font-size:var(--text-sm)}.prose strong{font-weight:600}.prose em{font-style:italic}.prose code{background:var(--clr-border-soft);padding:.1em .4em;border-radius:4px;font-family:Fira Code,monospace;font-size:.85em}.prose pre{background:#1e1e2e;color:#cdd6f4;padding:var(--sp-4);border-radius:var(--rad-md);overflow-x:auto;margin-bottom:var(--sp-3)}.prose pre code{background:none;padding:0;color:inherit}.prose table{border-collapse:collapse;width:100%;margin-bottom:var(--sp-3);font-size:var(--text-sm)}.prose td,.prose th{border:1px solid var(--clr-border);padding:var(--sp-2) var(--sp-3);text-align:left}.prose th{background:var(--clr-surface-alt);font-weight:600}.prose blockquote{border-left:3px solid var(--clr-accent);padding-left:var(--sp-4);color:var(--clr-text-muted);margin:var(--sp-3) 0}.prose hr{border:none;border-top:1px solid var(--clr-border);margin:var(--sp-5) 0}.btn-primary{display:inline-block;background:var(--clr-brand);color:#fff;padding:var(--sp-3) var(--sp-8);border-radius:var(--rad-sm);font-weight:600;font-size:var(--text-base);transition:background .15s;border:none;cursor:pointer}.btn-primary:hover{background:var(--clr-brand-dark);text-decoration:none}.btn-primary:disabled,.btn-primary[disabled]{opacity:.6;cursor:not-allowed}.btn-nav-logout{background:none;border:none;color:inherit;cursor:pointer;font-size:var(--text-sm);padding:0}.btn-nav-logout:hover{text-decoration:underline}.hero{padding:5rem var(--sp-4) 4rem;text-align:center}.hero h1{font-size:var(--text-3xl);font-weight:800;line-height:1.2;margin-bottom:var(--sp-4)}.hero .sub{font-size:var(--text-lg);color:var(--clr-text-muted);margin-bottom:var(--sp-8);max-width:520px;margin-left:auto;margin-right:auto}.auth-box{max-width:400px;margin:var(--sp-10) auto}.auth-box h1{font-size:var(--text-2xl);font-weight:700;margin-bottom:var(--sp-6)}.form-field{margin-bottom:var(--sp-4);display:flex;flex-direction:column;gap:var(--sp-2)}.form-field label{font-weight:500;font-size:var(--text-sm)}.form-field input{padding:var(--sp-2) var(--sp-3);border:1px solid #d1d5db;border-radius:var(--rad-sm);font-size:var(--text-base);width:100%}.form-field input:focus{outline:2px solid var(--clr-brand);border-color:transparent}.form-error{color:var(--clr-error);margin:var(--sp-2) 0}.auth-link,.form-error{font-size:var(--text-sm)}.auth-link{margin-top:var(--sp-5);color:var(--clr-text-muted)}.btn-google{display:flex;align-items:center;justify-content:center;gap:var(--sp-3);width:100%;padding:var(--sp-3) var(--sp-4);background:#fff;color:#3c4043;border:1px solid #dadce0;border-radius:var(--rad-md);font-size:var(--text-sm);font-weight:500;cursor:pointer;transition:background .15s,box-shadow .15s}.btn-google:hover{background:#f8f9fa;box-shadow:0 1px 3px rgba(0,0,0,.1)}.btn-google:disabled{opacity:.6;cursor:not-allowed}.auth-divider{display:flex;align-items:center;gap:var(--sp-3);margin:var(--sp-5) 0;color:var(--clr-text-muted);font-size:var(--text-sm)}.auth-divider:after,.auth-divider:before{content:"";flex:1 1;height:1px;background:#e5e7eb}.stats-row{display:flex;gap:var(--sp-4);flex-wrap:wrap;margin-bottom:var(--sp-8)}.stat-card{background:var(--clr-surface-alt);border:1px solid var(--clr-border);border-radius:var(--rad-md);padding:var(--sp-5) var(--sp-6);min-width:130px}.stat-value{display:block;font-size:var(--text-3xl);font-weight:800;color:var(--clr-brand);line-height:1;margin-bottom:var(--sp-1)}.stat-label{font-size:var(--text-xs)}.empty-state,.stat-label{color:var(--clr-text-muted)}.module-stepper{padding-bottom:var(--sp-12)}.stepper-header{display:flex;gap:0;overflow-x:auto;border-bottom:2px solid var(--clr-border);margin-bottom:0;scrollbar-width:none}.stepper-header::-webkit-scrollbar{display:none}.stepper-step{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:var(--sp-3) var(--sp-3);background:none;cursor:pointer;border:none;border-bottom:2px solid transparent;margin-bottom:-2px;min-width:72px;transition:color .1s;color:var(--clr-text-faint)}.stepper-step:hover:not(.active):not(.locked){color:var(--clr-text)}.stepper-step.active{color:var(--clr-brand);border-bottom-color:var(--clr-brand)}.stepper-step.done{color:var(--clr-success)}.stepper-step.locked{opacity:.4;cursor:not-allowed}.step-num{width:24px;height:24px;border-radius:var(--rad-full);background:currentColor;color:#fff;display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);font-weight:700;flex-shrink:0}.stepper-step.done .step-num{background:var(--clr-success)}.step-label{font-size:var(--text-xs);white-space:nowrap}.stepper-progress{height:3px;background:var(--clr-border);margin-bottom:var(--sp-6)}.stepper-progress-bar{height:100%;background:var(--clr-brand);transition:width .3s ease}.stepper-content{min-height:300px;margin-bottom:var(--sp-8)}.stepper-nav{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-4) 0;border-top:1px solid var(--clr-border)}.stepper-nav-btn{padding:var(--sp-2) var(--sp-5);border:1px solid var(--clr-border);border-radius:var(--rad-sm);background:var(--clr-surface);cursor:pointer;font-size:var(--text-sm);color:var(--clr-text);transition:border-color .15s,background .15s}.stepper-nav-btn:hover:not(:disabled){border-color:var(--clr-brand);color:var(--clr-brand)}.stepper-nav-btn.primary{background:var(--clr-brand);color:#fff;border-color:var(--clr-brand)}.stepper-nav-btn.primary:hover:not(:disabled){background:var(--clr-brand-dark);border-color:var(--clr-brand-dark)}.stepper-nav-btn:disabled{opacity:.4;cursor:not-allowed}.step-intro,.stepper-page{font-size:var(--text-sm);color:var(--clr-text-muted)}.step-intro{margin-bottom:var(--sp-5)}.sim-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--sp-3);min-height:240px;text-align:center;background:var(--clr-surface-alt);border:1px dashed var(--clr-border);border-radius:var(--rad-lg)}.sim-placeholder-icon{font-size:3rem;line-height:1}.sim-placeholder p{font-size:var(--text-sm);color:var(--clr-text)}.sim-placeholder .text-muted{font-size:var(--text-xs)}.weakness-list{display:flex;flex-direction:column;gap:var(--sp-3);margin-bottom:var(--sp-8)}.weakness-card{background:var(--clr-surface);border:1px solid var(--clr-border);border-left:4px solid var(--clr-error);border-radius:var(--rad-md);padding:var(--sp-4) var(--sp-5);display:flex;align-items:center;justify-content:space-between;gap:var(--sp-4);flex-wrap:wrap}.weakness-card-left{flex:1 1;min-width:0}.weakness-error-id{font-size:var(--text-xs);color:var(--clr-text-faint);font-family:Fira Code,monospace;margin-bottom:var(--sp-1)}.weakness-error-count{font-size:var(--text-sm);color:var(--clr-text-muted)}.weakness-error-count strong{color:var(--clr-error);font-weight:700}.weakness-card-action{flex-shrink:0}.btn-outline{padding:var(--sp-2) var(--sp-4);border:1px solid var(--clr-brand);border-radius:var(--rad-sm);color:var(--clr-brand);font-size:var(--text-xs);font-weight:600;white-space:nowrap;background:transparent;cursor:pointer}.btn-outline:hover{background:var(--clr-brand-light);text-decoration:none}.cta-upsell{background:linear-gradient(135deg,#1d4ed8,#4f46e5);color:#fff;border-radius:var(--rad-lg);padding:var(--sp-8) var(--sp-8);text-align:center;margin-top:var(--sp-10)}.cta-upsell h3{font-size:var(--text-xl);font-weight:700;margin-bottom:var(--sp-3)}.cta-upsell p{font-size:var(--text-sm);opacity:.9;margin-bottom:var(--sp-6);max-width:460px;margin-left:auto;margin-right:auto}.btn-white{display:inline-block;background:#fff;color:#1d4ed8;padding:var(--sp-3) var(--sp-8);border-radius:var(--rad-sm);font-weight:700;font-size:var(--text-base);transition:opacity .15s;border:none;cursor:pointer}.btn-white:hover{opacity:.9;text-decoration:none}.progress-bar{height:8px;background:var(--clr-border);border-radius:var(--rad-full);overflow:hidden}.progress-bar-fill{height:100%;background:var(--clr-brand);border-radius:var(--rad-full);transition:width .3s ease}@media (max-width:600px){.hero h1{font-size:var(--text-2xl)}.stepper-step{min-width:56px;padding:var(--sp-2) var(--sp-2)}.step-label{display:none}.match-cols{grid-template-columns:1fr}.stats-row{gap:var(--sp-3)}.stat-card{flex:1 1 calc(50% - var(--sp-3));min-width:0}.cta-upsell{padding:var(--sp-6) var(--sp-4)}}:root{--clr-primary:#2563eb;--clr-primary-strong:#1d4ed8;--clr-primary-soft:#eaf1ff;--clr-primary-ring:#93c5fd;--clr-danger:#ef4444;--clr-danger-strong:#dc2626;--clr-done:#16a34a;--clr-done-soft:#e9f7ef;--clr-doing:#f97316;--clr-doing-soft:#fff3e8;--clr-gold:#f59e0b;--clr-exam-bg:#f4f6fb;--shadow-sm:0 1px 2px rgba(20,30,55,.05);--shadow-md:0 6px 24px rgba(20,30,55,.09)}.exam-layout{display:flex;flex-direction:column;min-height:100vh;background:var(--clr-exam-bg);padding:18px;gap:18px;max-width:1480px;margin:0 auto;box-sizing:border-box}.exam-header{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;grid-gap:24px;gap:24px;padding:16px 24px;background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--rad-lg);box-shadow:var(--shadow-sm)}.h-title{display:flex;align-items:center;gap:12px}.h-doc{width:38px;height:38px;border-radius:10px;background:var(--clr-primary-soft);display:grid;place-items:center;font-size:18px;flex-shrink:0}.h-title__name{font-size:17px;font-weight:800;margin:0 0 4px}.h-meta{display:flex;gap:18px;color:var(--clr-text-muted);font-size:13px;flex-wrap:wrap}.h-meta b{color:var(--clr-text);font-weight:600}.timer-wrap{text-align:center}.timer-top{display:flex;align-items:center;justify-content:center;gap:6px;color:var(--clr-text-muted);font-size:13px;margin-bottom:2px}.timer-val{font-size:30px;font-weight:800;letter-spacing:.5px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--clr-primary);line-height:1.05}.timer--warn .timer-val{color:var(--clr-doing)}.timer--danger .timer-val{color:var(--clr-danger);animation:blink 1s infinite}@keyframes blink{50%{opacity:.5}}.h-progress{display:flex;align-items:center;gap:12px;margin-top:6px}.h-progress__bar{flex:1 1;height:7px;border-radius:99px;background:var(--clr-border);overflow:hidden;min-width:120px}.h-progress__fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--clr-primary),#3b82f6);transition:width .35s ease}.h-progress__txt{font-size:13px;color:var(--clr-text-muted);white-space:nowrap}.h-actions{display:flex;justify-content:flex-end}.exam-body{display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-gap:18px;gap:18px;align-items:start}.exam-main{background:var(--clr-surface);border:1px solid var(--clr-border);border-radius:var(--rad-lg);box-shadow:var(--shadow-sm);overflow:hidden}.exam-aside{display:flex;flex-direction:column;gap:18px}.exam-q-header{display:flex;align-items:center;gap:12px;padding:22px 28px 0}.exam-q-header__num{font-size:20px;font-weight:800}.exam-q-header__spacer{flex:1 1}.q-badge{font-size:12px;font-weight:800;letter-spacing:.04em;color:#fff;background:var(--clr-primary);padding:5px 12px;border-radius:999px}.q-badge,.q-mark{white-space:nowrap}.q-mark{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--clr-border);background:var(--clr-surface);color:var(--clr-text-muted);font-size:13px;font-weight:600;padding:7px 14px;border-radius:999px;cursor:pointer;transition:border-color .15s,color .15s,background .15s}.q-mark:hover{border-color:var(--clr-border-soft);background:var(--clr-surface-alt)}.q-mark--on{color:var(--clr-gold);border-color:var(--clr-gold);background:#fff8e8}.q-passage{border-left:3px solid var(--clr-primary);padding:16px 20px;margin:18px 28px 4px;background:var(--clr-primary-soft);border-radius:0 var(--rad-sm) var(--rad-sm) 0;font-size:var(--text-sm);line-height:1.7}.q-stem-wrap{padding:18px 28px 4px}.q-stem{font-size:16px;line-height:1.6}.q-assets{margin:12px 0 4px;display:flex;flex-direction:column;gap:12px}.q-asset{margin:0;text-align:center}.q-asset__img{max-width:30%;height:auto;border-radius:var(--rad-sm)}.q-asset__caption{font-size:var(--text-sm);margin-top:6px}.q-asset__caption,.q-hint{color:var(--clr-text-muted)}.q-hint{margin:0 28px 16px;padding:12px 16px;background:var(--clr-surface-alt);border:1px solid 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