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i{color:var(--color-primary)}.stk__d.is-nay:after{content:"";position:absolute;bottom:2px;width:5px;height:5px;border-radius:50%;background:currentColor}.stk__luat{margin-top:10px}.stk__luat-h{font-size:16px;font-weight:800;color:var(--color-ink);margin-bottom:4px}.stk__luat-p{font-size:13.5px;line-height:1.5;color:var(--color-sub);margin-bottom:10px}.stk__luat-bang{border:2px solid var(--color-border);border-radius:12px;overflow:hidden}.stk__luat-hang{display:grid;grid-template-columns:1.4fr 1fr 1fr;padding:8px 12px;font-size:14px;font-weight:700;color:var(--color-ink)}.stk__luat-hang span:not(:first-child){text-align:center}.stk__luat-hang+.stk__luat-hang{border-top:1px solid var(--color-border)}.stk__luat-hang--dau{background:var(--color-primary-soft, #EAF2FD);color:var(--color-sub);font-size:12.5px;text-transform:uppercase;letter-spacing:.04em}.stk__luat-hang.is-dang{background:#FF7A1A;color:#fff}.stk__luat-chu{margin-top:10px;font-size:13.5px;line-height:1.5;color:var(--color-sub)}.stk__luat-chu b{color:#ff7a1a}.portal-container{display:flex;background-color:#f0f2f5;min-height:100vh}.portal-main-view{margin-left:80px;width:calc(100% - 80px);padding:2rem;display:flex;justify-content:center}.portal-main-content{width:100%;max-width:1100px}.path-viewport{width:100%;height:100%;position:relative;overflow:hidden;cursor:grab;background-image:url(/background.png);background-size:cover;background-position:center;background-repeat:no-repeat}.path-viewport:active{cursor:grabbing}.path-canvas{position:absolute}.stair-step{position:absolute;width:180px;height:70px;background-color:#fff;border-radius:8px;border:2px solid #ced4da;display:flex;justify-content:center;align-items:center;font-weight:600;color:var(--text-color-dark);cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;box-shadow:none;padding:0 10px;text-align:center;font-size:.9rem}.stair-step:hover{transform:translateY(-4px) scale(1.05);box-shadow:none}.path-viewport:active .stair-step{cursor:grabbing}.stair-step.locked{background-color:#e9ecef;color:#adb5bd;border-color:#dee2e6;cursor:not-allowed}.stair-step.locked:hover{transform:none;box-shadow:none}.stair-step.unlocked{border-color:var(--accent-blue-color);color:var(--accent-blue-color)}.stair-step.active{background-color:var(--accent-blue-color);color:#fff;border-color:#fff;box-shadow:none;transform:scale(1.1)}.stair-step.mastered{background-color:#28c940;color:#fff;border-color:#28a745}.path-avatar{position:absolute;width:80px;height:80px;background-image:url(/path-character.png);background-size:contain;background-repeat:no-repeat;transition:all .5s ease-in-out;z-index:10;pointer-events:none}.practice-session-wrapper{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;padding-top:20px}.practice-progress-bar-container{display:none;max-width:1200px;height:12px;background-color:#e9ecef;border-radius:6px;overflow:hidden;margin-bottom:2rem;position:relative;cursor:help}.practice-progress-bar-fill{height:100%;background:linear-gradient(to right,#4CAF50,#8BC34A);width:0%;transition:width .5s ease-out;border-radius:6px}.practice-progress-tooltip{position:absolute;bottom:calc(100% + 10px);left:50%;transform:translate(-50%);background:#343a40;color:#fff;padding:8px 15px;border-radius:8px;font-size:.9rem;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease;pointer-events:none;z-index:10;box-shadow:none}.practice-progress-bar-container:hover .practice-progress-tooltip{opacity:1;visibility:visible}.practice-content{width:85%;max-width:1200px;display:flex;flex-direction:column;gap:1.5rem;background:transparent;padding:0;overflow-y:auto;flex-grow:1}.practice-question-panel{background:white;border-radius:12px;padding:2rem;border:1px solid #e9ecef;box-shadow:none}.practice-question-content{font-size:1.5rem;margin-bottom:2rem;line-height:1.6}.hints-section{display:flex;flex-direction:column;align-items:flex-start;gap:1rem;margin-top:1.5rem}.hint-button,.submit-answer-button{background:var(--accent-blue-color);color:#fff;border:2px solid var(--accent-blue-color);border-radius:999px;font-weight:600;cursor:pointer;transition:all .2s ease;padding:.75rem 1.5rem}.hint-button:hover,.submit-answer-button:hover{box-shadow:none;background-color:#0056b3}.hint-button:disabled{background-color:#a9d6ff;border-color:#a9d6ff;cursor:not-allowed;transform:none;box-shadow:none}.submit-answer-button{display:block;width:auto;min-width:150px;text-align:center;margin:2rem auto 0}.explanation-on-page{margin-top:2rem;padding:1.5rem;background-color:#f8f9fa;border:1px solid #dee2e6;border-radius:8px}.hint-display-area{background-color:#e7f5ff;border-left:5px solid #007bff;padding:1.5rem;border-radius:8px;margin-top:1rem;font-size:1rem;line-height:1.6;margin-bottom:1.5rem}.answer-form{margin-top:0;display:flex;flex-direction:column;gap:1.5rem}.mcq-options{display:flex;flex-direction:column;gap:1rem}.mcq-option{display:flex;align-items:flex-start;gap:15px;padding:1rem;border:2px solid #e9ecef;border-radius:8px;cursor:pointer;transition:all .2s}.mcq-option:hover{border-color:#ced4da}.mcq-option.selected{border-color:var(--accent-blue-color);background-color:#e7f5ff}.mcq-option input[type=radio]{margin-top:8px;flex-shrink:0;width:1.2em;height:1.2em}.short-answer-input{width:100%;font-size:1.2rem;padding:1rem;border:2px solid #ced4da;border-radius:8px}.short-answer-input:focus{outline:none;border-color:var(--accent-blue-color);box-shadow:0 0 0 3px #007bff33}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideInUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.practice-feedback-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);display:flex;justify-content:center;align-items:center;z-index:3000;animation:fadeIn .3s ease}.practice-feedback-content{background:white;padding:2.5rem;border-radius:12px;text-align:center;width:90%;max-width:450px;border-top:8px solid;animation:slideInUp .3s ease;box-shadow:none}.practice-feedback-content.correct{border-color:#28c940}.practice-feedback-content.incorrect{border-color:#fa5252}.practice-feedback-content h4{font-size:1.8rem;margin-bottom:1.5rem}.feedback-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.feedback-button{flex-grow:1;padding:12px 25px;border-radius:999px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;max-width:180px}.feedback-button.continue{background-color:var(--accent-blue-color);color:#fff;border:2px solid var(--accent-blue-color)}.feedback-button.continue:hover{background-color:#0056b3;box-shadow:none}.feedback-button.explanation{background-color:transparent;color:var(--accent-blue-color);border:2px solid var(--accent-blue-color)}.feedback-button.explanation:hover{background-color:#007bff1a}.course-selection-container{text-align:center;padding:4rem 1rem}.dashboard-actions{display:flex;flex-direction:column;gap:1rem;align-items:center;margin-top:1.5rem}.gradient-button,.gradient-button-secondary{border-radius:999px;padding:.75rem 1.5rem;font-weight:600;transition:all .2s;cursor:pointer;min-width:150px;text-align:center}.gradient-button{background:var(--accent-blue-color);color:#fff;border:2px solid var(--accent-blue-color)}.gradient-button:hover{box-shadow:none}.gradient-button-secondary{background:transparent;color:var(--accent-blue-color);border:2px solid var(--accent-blue-color)}.gradient-button-secondary:hover{background:rgba(0,123,255,.1)}.path-canvas.is-recentering{transition:transform .5s cubic-bezier(.25,.8,.25,1)}.recenter-button{position:absolute;bottom:25px;right:25px;z-index:100;width:50px;height:50px;border-radius:50%;background-color:var(--accent-blue-color);color:#fff;border:none;box-shadow:none;display:flex;justify-content:center;align-items:center;cursor:pointer;transition:transform .2s ease,background-color .2s ease}.recenter-button:hover{transform:scale(1.1);background-color:#0069d9}.recenter-button svg{font-size:1.5rem}.recenter-tooltip{position:absolute;right:100%;margin-right:12px;background-color:#343a40;color:#fff;padding:6px 10px;border-radius:4px;font-size:.85rem;font-weight:600;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s;pointer-events:none}.recenter-button:hover .recenter-tooltip{opacity:1;visibility:visible}.portal-main-view.full-bleed{padding:0;display:block}.portal-main-view.full-bleed .portal-main-content.full-bleed{max-width:none;height:100vh}.path-viewport{width:100%;height:100%;position:relative;overflow:hidden;cursor:grab;background-size:cover;background-position:center;background-repeat:no-repeat}.practice-session-container{margin-left:80px;width:calc(100% - 80px);min-height:100vh;padding:2rem;display:flex;flex-direction:column;align-items:center;box-sizing:border-box}.practice-session-container .practice-content{width:100%;max-width:1100px;display:flex;flex-direction:column;gap:1.5rem}.test-progress-bar{width:100%;height:10px;background:#e9ecef;border-radius:6px;overflow:hidden;position:relative;margin-bottom:2rem;cursor:pointer}.test-progress-bar-fill{height:100%;background-color:var(--accent-blue-color);width:0%;transition:width .4s ease-out;border-radius:6px}.test-progress-tooltip{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translate(-50%);background:#343a40;color:#fff;padding:6px 12px;border-radius:6px;font-size:.9rem;white-space:nowrap;opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;pointer-events:none;z-index:10}.test-progress-bar:hover .test-progress-tooltip{opacity:1;visibility:visible}.practice-question-content,.hint-display-area,.explanation-on-page,.practice-question-panel h3{color:var(--accent-blue-color)}.ses-trong,.ses-trong__ng,.ses-trong__ruot,.ses-trong__nhac{font-weight:800;color:var(--color-ink)}.ses-trong__ruot.is-dung{color:var(--color-green, #22A06B)}.ses-trong__ruot.is-sai{color:var(--color-danger, #EF4444)}.ses-trong-bay{position:fixed;z-index:9999;pointer-events:none;display:inline-flex;align-items:center;color:var(--color-ink);font-family:var(--font-family);font-weight:800;font-size:16px;white-space:nowrap;transition:left .34s cubic-bezier(.3,.8,.3,1),top .34s cubic-bezier(.3,.8,.3,1),height .34s ease,opacity .34s ease}.ses-stage{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;display:grid;place-items:center;padding:22px 18px;overflow:hidden;font-family:var(--font-family);background:radial-gradient(1200px 700px at 82% -8%,#eaf3ff 0%,rgba(234,243,255,0) 60%),radial-gradient(1000px 620px at 6% 110%,#fff1e8 0%,rgba(255,241,232,0) 60%),linear-gradient(180deg,#fbfdff 0%,#f4f8ff 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.ses-eyebrow{color:var(--color-carp-tx)}.ses-ftitle{font-size:18px;font-weight:800;color:var(--color-ink);margin-top:4px;line-height:1.25}.ses-view{position:relative;flex:1;min-height:0;overflow:hidden}.ses-view-inner{position:absolute;top:0;left:0;right:0;padding:4px 24px 20px;transform-origin:top center;will-change:transform}.ses-view-ctrl{position:absolute;right:12px;bottom:12px;display:flex;flex-direction:column;gap:6px;z-index:6}.ses-vbtn{width:32px;height:32px;border-radius:50%;border:1px solid rgba(15,30,53,.08);background:rgba(255,255,255,.92);color:var(--color-primary);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:13px;box-shadow:none;transition:background .14s,transform .08s,opacity .14s}.ses-vbtn:hover:not(:disabled){background:#fff}.ses-vbtn:disabled{opacity:.35;cursor:default}.ses-taskbar{flex-shrink:0;display:flex;align-items:center;gap:8px;padding:12px 16px;border-top:1px solid rgba(15,30,53,.07);background:rgba(255,255,255,.55)}.ses-dots{flex:1;min-width:0;display:flex;align-items:center;gap:7px;overflow-x:auto;padding:2px;scrollbar-width:none}.ses-dots::-webkit-scrollbar{display:none}.ses-tbtn{flex-shrink:0;width:42px;height:42px;border-radius:50%;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;font-family:var(--font-family);font-weight:800;transition:transform .08s,box-shadow .16s,opacity .14s}.ses-tbtn:active{transform:translateY(1px)}.ses-tbtn--ghost{background:#fff;color:var(--color-sub);border:1.5px solid var(--color-border)}.ses-tbtn--ghost:hover:not(:disabled){border-color:#c9d8f0;color:var(--color-ink)}.ses-tbtn--primary{background:var(--color-primary-grad);color:#fff;box-shadow:none;font-size:13px}.ses-tbtn--success{background:var(--color-green-grad);color:#fff;box-shadow:none;font-size:13px}.ses-tbtn--carp{background:var(--color-carp-grad);color:#fff;box-shadow:none;font-size:13px}.ses-tbtn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.ses-tact{flex-shrink:0;height:44px;padding:0 20px;border-radius:22px;border:none;display:inline-flex;align-items:center;justify-content:center;gap:7px;cursor:pointer;font-family:var(--font-family);font-weight:800;font-size:14px;color:#fff;transition:transform .08s,box-shadow .16s,opacity .14s}.ses-tact:active{transform:translateY(1px)}.ses-tact--primary{background:var(--color-primary-grad);box-shadow:none}.ses-tact--success{background:var(--color-green-grad);box-shadow:none}.ses-tact--carp{background:var(--color-carp-grad);box-shadow:none}.ses-tact:disabled{opacity:.5;cursor:not-allowed;box-shadow:none}.ses-timer{flex-shrink:0;display:inline-flex;align-items:center;gap:6px;height:42px;padding:0 14px;border-radius:21px;font-size:14px;font-weight:800;font-variant-numeric:tabular-nums}.ses-timer--ok{background:var(--color-primary-soft);color:var(--color-primary)}.ses-timer--low{background:var(--color-danger-soft);color:var(--color-danger)}.ses-dot{position:relative;flex-shrink:0;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:800;font-family:var(--font-family);cursor:pointer;border:2px solid transparent;background:#E9EDF4;color:var(--color-sub);transition:transform .1s,box-shadow .14s,background 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6px}.ses-pop-item{display:flex;align-items:center;gap:11px;width:100%;border:none;background:transparent;padding:10px;border-radius:10px;font-family:var(--font-family);font-size:14px;font-weight:600;color:var(--color-ink);cursor:pointer;text-align:left;transition:background .12s}.ses-pop-item:hover{background:#F4F7FC}.ses-qmeta{display:flex;align-items:center;gap:8px;margin-bottom:12px}.ses-chip{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}.ses-chip--review{background:var(--color-gold-soft);color:var(--color-gold-tx)}.ses-question{font-size:19px;line-height:1.6;color:var(--color-ink);font-weight:500;max-width:var(--pt-col, 560px);margin-left:auto;margin-right:auto;text-align:left;overflow-wrap:break-word}.ses-question p{margin:0 0 .4em}.ses-question .de-cach-cau-hoi{display:block;height:.8em}.ses-question--giua,.ses-question--giua p{text-align:center}.ses-question--tu{font-size:26px;line-height:1.35;margin-top:22px;margin-bottom:4px}.ses-question--tu b,.ses-question--tu strong{color:var(--color-primary)}.ses-opts{margin-top:20px;display:flex;flex-direction:column;gap:10px}.ses-opt{display:flex;align-items:center;gap:13px;padding:14px 16px;border-radius:15px;font-size:16.5px;color:var(--color-ink);border:1.5px solid var(--color-border);background:rgba(255,255,255,.75);cursor:pointer;transition:border-color .14s,background .14s,transform .08s,box-shadow .14s}.ses-opt:hover:not(.is-locked){border-color:#c9d8f0;background:#fff;box-shadow:none}.ses-opt.is-selected{border-color:var(--color-primary);background:var(--color-primary-soft)}.ses-opt.is-correct{border-color:#7bd9ae;background:var(--color-green-soft)}.ses-opt.is-wrong{border-color:#f0a5a5;background:var(--color-danger-soft)}.ses-opt.is-dim{opacity:.5}.ses-opt.is-locked{cursor:default}.ses-badge{width:30px;height:30px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;background:#EEF1F6;color:var(--color-sub);transition:background .14s,color .14s}.ses-opt.is-selected .ses-badge{background:var(--color-primary);color:#fff}.ses-opt.is-correct .ses-badge{background:var(--color-green);color:#fff}.ses-opt.is-wrong .ses-badge{background:var(--color-danger);color:#fff}.ses-opt-text{flex:1;min-width:0}.ses-opt-mark{flex-shrink:0;font-size:15px}.ses-input{width:100%;box-sizing:border-box;border-radius:14px;padding:14px 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svg{font-size:15px;color:var(--color-muted)}.lnav__mi:hover{background:var(--color-primary-soft)}.lnav__mi.danger{color:#ef4444}.lnav__mi.danger svg{color:#ef4444}.lnav__theme-wrap{position:relative}.lnav__menu--theme{top:-6px;bottom:auto;min-width:0;padding:12px;border-radius:10px;background:color-mix(in srgb,var(--color-surface) 80%,transparent);display:grid;grid-template-columns:repeat(2,auto);gap:12px}.lnav__swatch{width:36px;height:36px;border-radius:50%;border:0;padding:0;margin:0;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:inset 0 0 0 1px #0000001f;transition:transform .12s ease}.lnav__swatch:hover{transform:scale(1.1)}.lnav__swatch.is-on{box-shadow:0 0 0 2px var(--color-surface),0 0 0 4px var(--color-primary)}.lnav__swatch-check{color:#fff;font-size:15px;filter:drop-shadow(0 1px 2px rgba(0,0,0,.4))}:root[data-mode=dark] .lnav{box-shadow:1px 0 #ffffff0f}:root[data-mode=dark] .lnav__menu{box-shadow:none}@media (max-height: 760px){.lnav{padding:12px 0 10px}.lnav__logo{width:38px;height:38px;margin-bottom:10px}.lnav__stats{margin-bottom:8px;gap:4px}.lnav__items{gap:12px}.lnav__btn{margin-bottom:0;width:44px;height:44px;font-size:22px}.lnav__avatar{margin-bottom:0;width:42px;height:42px}}@media (max-height: 520px){.lnav{padding:8px 0}.lnav__logo{width:30px;height:30px;margin-bottom:6px}.lnav__stats{display:none}.lnav__items{gap:8px}.lnav__btn{width:40px;height:40px;font-size:19px}.lnav__avatar{width:38px;height:38px;font-size:15px}}.left-nav-bar{position:fixed;top:0;left:0;height:100vh;width:80px;background-color:#fff;border-right:1px solid #e9ecef;display:flex;flex-direction:column;justify-content:space-between;align-items:center;padding:1.5rem 0;z-index:2000;transition:width .3s ease}.nav-logo 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