.lms-open{--c-primary:#0B3D91;--c-primary-700:#143F8C;--c-primary-600:#1E4FB0;--c-primary-500:#2C66D6;--c-primary-400:#4D85E8;--c-primary-300:#7BA3E8;--c-primary-200:#B3CAF2;--c-primary-100:#DCE7FB;--c-primary-50:#EEF3FD;--c-primary-fg:#FFFFFF;--c-bg:#F4F6FA;--c-surface:#FFFFFF;--c-surface-elev:#FFFFFF;--c-surface-sunken:#EEF1F7;--c-surface-2:#F8FAFD;--c-fg:#0E1830;--c-fg-2:#2A3552;--c-fg-3:#5A6786;--c-fg-4:#8893B0;--c-fg-inverse:#FFFFFF;--c-border:#DDE3EE;--c-border-strong:#C5CEDF;--c-divider:#E7ECF4;--c-success:#167A4A;--c-success-bg:#DCF2E5;--c-success-fg:#0F5C36;--c-warning:#B4690E;--c-warning-bg:#FCE9CE;--c-warning-fg:#7A4607;--c-danger:#C0322B;--c-danger-bg:#FBE0DE;--c-danger-fg:#841F1A;--c-info:#1E6FB5;--c-info-bg:#DCEAF7;--c-info-fg:#134B7C;--c-accent:#6A3FBA;--c-accent-bg:#ECE2FB;--c-subj-toan:#1E6FB5;--c-subj-van:#B4690E;--c-subj-anh:#167A4A;--c-subj-su:#8C3A1F;--c-subj-dia:#167A4A;--c-subj-ly:#6A3FBA;--c-subj-hoa:#B4690E;--c-subj-sinh:#167A4A;--c-subj-tin:#2C66D6;--r-sm:4px;--r-md:8px;--r-lg:12px;--r-xl:16px;--r-2xl:24px;--r-pill:999px;--sh-sm:0 1px 2px rgba(11,24,48,0.05),0 1px 1px rgba(11,24,48,0.03);--sh-md:0 4px 10px rgba(11,24,48,0.07),0 1px 2px rgba(11,24,48,0.04);--sh-lg:0 10px 30px rgba(11,24,48,0.10),0 2px 6px rgba(11,24,48,0.05);--sh-focus:0 0 0 3px rgba(44,102,214,0.30);--gap-page:24px;--ff-sans:"Be Vietnam Pro",system-ui,sans-serif;--ff-mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace}.dark .lms-open{--c-primary:#5C92EA;--c-primary-700:#2C66D6;--c-primary-600:#4D85E8;--c-primary-500:#7BA3E8;--c-primary-400:#95B6EE;--c-primary-300:#B3CAF2;--c-primary-200:#4862A0;--c-primary-100:#243670;--c-primary-50:#1B2D52;--c-primary-fg:#08152E;--c-bg:#0A1226;--c-surface:#131C36;--c-surface-elev:#1A2442;--c-surface-sunken:#0E1730;--c-surface-2:#182242;--c-fg:#ECF0F9;--c-fg-2:#C7D0E5;--c-fg-3:#A5B0CC;--c-fg-4:#7E8BAD;--c-fg-inverse:#08152E;--c-border:#2F3B62;--c-border-strong:#44527E;--c-divider:#253158;--c-success:#41C281;--c-success-bg:#103823;--c-success-fg:#95E8B7;--c-warning:#E8AD52;--c-warning-bg:#3B260C;--c-warning-fg:#FBD79C;--c-danger:#EE6F69;--c-danger-bg:#3B1714;--c-danger-fg:#FAB2AE;--c-info:#4FA0E5;--c-info-bg:#102541;--c-info-fg:#A8CDEE;--c-accent:#A37BE6;--c-accent-bg:#251A40;--c-subj-toan:#4FA0E5;--c-subj-van:#E8AD52;--c-subj-anh:#41C281;--c-subj-su:#D67A60;--c-subj-dia:#41C281;--c-subj-ly:#A37BE6;--c-subj-hoa:#E8AD52;--c-subj-sinh:#41C281;--c-subj-tin:#7BA3E8;--sh-sm:0 1px 2px rgba(0,0,0,0.45);--sh-md:0 4px 12px rgba(0,0,0,0.50);--sh-lg:0 12px 32px rgba(0,0,0,0.55);--sh-focus:0 0 0 3px rgba(123,163,232,0.45)}.lms-open :focus-visible{outline:none;box-shadow:var(--sh-focus);border-radius:var(--r-sm)}.lms-open{--lo-display:"Noto Serif","Times New Roman",serif;--lo-sans:var(--ff-sans);--lo-mono:var(--ff-mono);--lo-hero-grad:radial-gradient(120% 80% at 85% 0%,color-mix(in oklch,var(--c-primary-500) 35%,transparent),transparent 60%),linear-gradient(180deg,#0A1F4A 0%,#0B3D91 55%,#0E2A66 100%);--lo-grid-tint:color-mix(in srgb,#FFFFFF 6%,transparent);--lo-section-pad:clamp(48px,7vw,96px);--lo-edge:clamp(20px,5vw,64px);--lo-maxw:1366px;background:var(--c-bg);color:var(--c-fg);font-family:var(--lo-sans);font-size:15px;line-height:1.55;min-height:100vh}.lms-open *,.lms-open :after,.lms-open :before{box-sizing:border-box}.lms-open .wrap{max-width:var(--lo-maxw);margin:0 auto;padding-inline:var(--lo-edge)}.lo-top{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--c-surface) 86%,transparent);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--c-divider)}.lo-top__row{height:64px;gap:24px}.lo-top__brand,.lo-top__row{display:flex;align-items:center}.lo-top__brand{gap:10px;font-weight:700;letter-spacing:-.01em;color:var(--c-fg);font-size:15px}.lo-top__mark{width:28px;height:28px;border-radius:7px;background:linear-gradient(135deg,var(--c-primary-700),var(--c-primary-400));color:#fff;display:grid;place-items:center;font-family:var(--lo-mono);font-size:11px;font-weight:800;letter-spacing:.04em;box-shadow:inset 0 -1px 0 rgba(0,0,0,.18),0 2px 6px color-mix(in srgb,var(--c-primary) 30%,transparent)}.lo-top__nav{display:flex;gap:4px;margin-left:32px}.lo-top__nav a{padding:8px 12px;border-radius:var(--r-md);color:var(--c-fg-2);font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap;transition:background .12s,color .12s}.lo-top__nav a:hover{background:var(--c-surface-sunken);color:var(--c-fg)}.lo-top__nav a.is-active{color:var(--c-primary);background:var(--c-primary-50)}.lo-top__spacer{flex:1}.lo-top__cta{display:flex;align-items:center;gap:8px}.lo-hero{position:relative;isolation:isolate;overflow:hidden;background:var(--lo-hero-grad);color:#ECF0F9;padding-block:clamp(72px,10vw,120px) clamp(80px,9vw,112px)}.lo-hero:before{inset:0;background-image:linear-gradient(var(--lo-grid-tint) 1px,transparent 1px),linear-gradient(90deg,var(--lo-grid-tint) 1px,transparent 1px);background-size:48px 48px;background-position:0 0;mask-image:radial-gradient(80% 60% at 10% 30%,#000 30%,transparent 75%);-webkit-mask-image:radial-gradient(80% 60% at 10% 30%,#000 30%,transparent 75%);opacity:.7}.lo-hero:after,.lo-hero:before{content:"";position:absolute;z-index:-1}.lo-hero:after{right:-12%;top:-10%;width:60%;height:120%;background:radial-gradient(closest-side,color-mix(in srgb,var(--c-primary-400) 30%,transparent),transparent 70%);filter:blur(20px)}.lo-hero__wrap{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(32px,6vw,80px);align-items:center}.lo-hero__eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--lo-mono);font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:#B3CAF2;padding:6px 12px;background:color-mix(in srgb,#FFFFFF 10%,transparent);border:1px solid color-mix(in srgb,#ffffff 16%,transparent);border-radius:var(--r-pill);margin-bottom:24px}.lo-hero__eyebrow .dot{width:6px;height:6px;border-radius:50%;background:#41C281;box-shadow:0 0 0 3px color-mix(in srgb,#41C281 30%,transparent)}.lo-hero__title{font-family:var(--lo-display);font-size:clamp(40px,5.6vw,72px);line-height:1.04;letter-spacing:-.02em;font-weight:600;color:#FFFFFF;margin:0 0 24px;text-wrap:balance}.lo-hero__title em{font-style:italic;color:#FFE9B8;font-weight:500}.lo-hero__lede{font-size:18px;line-height:1.55;color:#C7D0E5;max-width:56ch;margin:0 0 36px;text-wrap:pretty}.lo-hero__actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:40px}.lo-btn{display:inline-flex;align-items:center;gap:8px;height:48px;padding:0 22px;border-radius:var(--r-md);font-family:inherit;font-size:15px;font-weight:600;border:1px solid transparent;background:transparent;color:var(--c-fg);cursor:pointer;transition:background .16s,border-color .16s,transform 80ms,box-shadow .16s;white-space:nowrap;text-decoration:none}.lo-btn:active{transform:translateY(1px)}.lo-btn--primary{background:#FFFFFF;color:#0A1F4A;border-color:#FFFFFF;box-shadow:0 8px 24px rgba(0,0,0,.18)}.lo-btn--primary:hover{background:#F4F6FA}.lo-btn--ghost-light{color:#FFFFFF;background:color-mix(in srgb,#FFFFFF 8%,transparent);border-color:color-mix(in srgb,#FFFFFF 22%,transparent)}.lo-btn--ghost-light:hover{background:color-mix(in srgb,#FFFFFF 14%,transparent)}.lo-btn--solid{background:var(--c-primary);color:var(--c-primary-fg);border-color:var(--c-primary)}.lo-btn--solid:hover{background:var(--c-primary-700);border-color:var(--c-primary-700)}.lo-btn--outline{background:var(--c-surface);border-color:var(--c-border-strong);color:var(--c-fg)}.lo-btn--outline:hover{border-color:var(--c-fg-3);background:var(--c-surface-2)}.lo-btn--sm{height:36px;padding:0 14px;font-size:13px}.lo-btn .chev{transition:transform .16s}.lo-btn:hover .chev{transform:translateX(2px)}.lo-hero__meta{display:flex;gap:28px;flex-wrap:wrap;padding-top:24px;border-top:1px solid color-mix(in srgb,#ffffff 12%,transparent)}.lo-hero__meta-item{display:flex;flex-direction:column;gap:4px}.lo-hero__meta-num{font-family:var(--lo-display);font-size:28px;font-weight:600;color:#FFFFFF;line-height:1;letter-spacing:-.01em}.lo-hero__meta-label{font-family:var(--lo-mono);font-size:10.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#95B6EE}.lo-hero__device{position:relative;perspective:1400px}.lo-device{background:#0E1830;border-radius:18px;padding:8px;box-shadow:0 30px 80px rgba(0,0,0,.45),0 0 0 1px color-mix(in srgb,#FFFFFF 14%,transparent),inset 0 0 0 1px color-mix(in srgb,#FFFFFF 8%,transparent);transform:rotate3d(0,1,.05,-6deg) rotateX(6deg)}.lo-device__bar{display:flex;align-items:center;gap:5px;padding:6px 10px 8px}.lo-device__bar span{width:8px;height:8px;border-radius:50%;background:color-mix(in srgb,#FFFFFF 18%,transparent)}.lo-device__bar span:first-child{background:#EE6F69}.lo-device__bar span:nth-child(2){background:#E8AD52}.lo-device__bar span:nth-child(3){background:#41C281}.lo-device__url{margin-left:12px;flex:1;height:22px;border-radius:6px;background:color-mix(in srgb,#FFFFFF 6%,transparent);display:flex;align-items:center;padding:0 10px;font-family:var(--lo-mono);font-size:10.5px;color:#95B6EE;letter-spacing:.04em}.lo-device__screen{background:#F4F6FA;border-radius:12px;overflow:hidden;padding:18px;display:grid;gap:14px;color:var(--c-fg)}.lo-device__row{display:flex;align-items:center;gap:10px}.lo-device__badge{font-family:var(--lo-mono);font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;padding:3px 8px;border-radius:var(--r-pill);background:var(--c-primary-50);color:var(--c-primary)}.lo-device__h{font-family:var(--lo-display);font-size:19px;font-weight:600;letter-spacing:-.01em;line-height:1.2;margin:0}.lo-device__sub{font-size:12.5px;color:var(--c-fg-3);margin:0}.lo-device__blocks{display:grid;gap:10px;padding:12px;background:#FFFFFF;border-radius:10px;border:1px solid var(--c-border)}.lo-device__line{height:8px;border-radius:4px;background:var(--c-surface-sunken)}.lo-device__line.w70{width:70%}.lo-device__line.w90{width:90%}.lo-device__line.w50{width:50%}.lo-device__q{border:1px solid var(--c-border);border-radius:8px;padding:10px;background:var(--c-surface-2);display:grid;gap:6px}.lo-device__opt{display:flex;align-items:center;gap:8px;padding:7px 9px;border-radius:6px;background:#fff;border:1px solid var(--c-border);font-size:12px}.lo-device__opt.is-correct{border-color:var(--c-success);background:var(--c-success-bg);color:var(--c-success-fg);font-weight:600}.lo-device__opt .mark{width:14px;height:14px;border-radius:50%;border:1.5px solid var(--c-border-strong);display:grid;place-items:center}.lo-device__opt.is-correct .mark{background:var(--c-success);border-color:var(--c-success);color:#fff}.lo-device__check{font-family:var(--lo-mono);font-size:10.5px;font-weight:700;letter-spacing:.08em;color:var(--c-success-fg);display:flex;align-items:center;gap:6px}.lo-hero__tag{position:absolute;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-lg);padding:10px 14px;box-shadow:var(--sh-lg);display:flex;align-items:center;gap:10px;font-size:13px;font-weight:600}.lo-hero__tag .ic{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-family:var(--lo-mono);font-size:11px;font-weight:800}.lo-hero__tag--a{top:-18px;left:-28px}.lo-hero__tag--b{bottom:-22px;right:-10px}.lo-stats{background:var(--c-surface);border-block:1px solid var(--c-divider);padding-block:36px}.lo-stats__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;align-items:end}.lo-stat{display:grid;gap:6px;border-left:2px solid var(--c-primary);padding-left:18px}.lo-stat__num{font-family:var(--lo-display);font-size:clamp(36px,4vw,48px);font-weight:600;color:var(--c-fg);line-height:1;letter-spacing:-.02em}.lo-stat__num small{font-size:.5em;color:var(--c-fg-3);margin-left:2px}.lo-stat__label{font-family:var(--lo-mono);font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--c-fg-3)}.lo-section{padding-block:var(--lo-section-pad)}.lo-section--tight{padding-block:clamp(40px,5vw,64px)}.lo-section--sunken{background:var(--c-surface-sunken)}.lo-section--surface{background:var(--c-surface);border-block:1px solid var(--c-divider)}.lo-sechead{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap}.lo-sechead__left{max-width:64ch}.lo-sechead__eye{font-family:var(--lo-mono);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--c-primary);margin-bottom:12px;display:inline-flex;align-items:center;gap:8px}.lo-sechead__eye:before{content:"";width:24px;height:1px;background:var(--c-primary)}.lo-sechead__title{font-family:var(--lo-display);font-size:clamp(28px,3.5vw,44px);line-height:1.08;font-weight:600;letter-spacing:-.02em;color:var(--c-fg);margin:0 0 12px;text-wrap:balance}.lo-sechead__sub{font-size:16px;color:var(--c-fg-3);margin:0;max-width:56ch;text-wrap:pretty}.lo-sechead__right{display:flex;gap:10px;align-items:center}.lo-filter{display:flex;gap:8px;flex-wrap:wrap;padding:12px;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-xl);box-shadow:var(--sh-sm);margin-bottom:32px}.lo-chip{display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 14px;border-radius:var(--r-pill);background:transparent;color:var(--c-fg-2);font-size:13.5px;font-weight:500;border:1px solid transparent;cursor:pointer;transition:background .12s,color .12s,border-color .12s;font-family:inherit}.lo-chip:hover{background:var(--c-surface-sunken);color:var(--c-fg)}.lo-chip.is-active{background:var(--c-fg);color:var(--c-bg);font-weight:600}.lo-chip__dot{width:8px;height:8px;border-radius:50%;background:var(--subj,var(--c-primary))}.lo-chip__count{font-family:var(--lo-mono);font-size:10.5px;font-weight:700;padding:1px 6px;border-radius:4px;background:color-mix(in srgb,var(--c-fg-3) 14%,transparent);color:var(--c-fg-3)}.lo-chip.is-active .lo-chip__count{background:color-mix(in srgb,#FFFFFF 22%,transparent);color:#FFFFFF}.lo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:20px}.lo-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-xl);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s cubic-bezier(.2,.7,.2,1),box-shadow .2s,border-color .2s;position:relative;isolation:isolate}.lo-card:before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:var(--subj,var(--c-primary));opacity:0;transition:opacity .2s;z-index:1}.lo-card:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:var(--c-border-strong)}.lo-card:hover:before{opacity:1}.lo-card__thumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,color-mix(in srgb,var(--subj,var(--c-primary)) 18%,#fff),color-mix(in srgb,var(--subj,var(--c-primary)) 8%,#fff));overflow:hidden;border-bottom:1px solid var(--c-divider)}.lo-card__thumb:after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(45deg,transparent 0 18px,color-mix(in srgb,var(--subj,var(--c-primary)) 8%,transparent) 18px 19px);opacity:.7}.lo-card__thumb-label{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--lo-display);font-size:42px;font-weight:600;letter-spacing:-.02em;color:color-mix(in srgb,var(--subj,var(--c-primary)) 90%,#fff);text-shadow:0 2px 12px color-mix(in srgb,var(--subj,var(--c-primary)) 18%,transparent)}.lo-card__badges{position:absolute;top:12px;left:12px;display:flex;gap:6px;z-index:2}.lo-card__badge{display:inline-flex;align-items:center;gap:4px;height:24px;padding:0 10px;border-radius:var(--r-pill);font-family:var(--lo-mono);font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;background:rgba(255,255,255,.95);color:var(--subj,var(--c-primary));backdrop-filter:blur(8px)}.lo-card__badge--level{background:var(--c-fg);color:#FFF}.lo-card__body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:14px;flex:1}.lo-card__meta{display:flex;align-items:center;gap:8px;font-family:var(--lo-mono);font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--c-fg-3)}.lo-card__meta strong{color:var(--subj,var(--c-primary))}.lo-card__title{font-family:var(--lo-display);font-size:22px;font-weight:600;letter-spacing:-.015em;line-height:1.18;color:var(--c-fg);margin:0;text-wrap:balance}.lo-card__teacher{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--c-fg-2)}.lo-card__avatar{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-family:var(--lo-mono);font-size:10.5px;font-weight:700;background:color-mix(in srgb,var(--subj,var(--c-primary)) 14%,transparent);color:var(--subj,var(--c-primary));border:1px solid color-mix(in srgb,var(--subj,var(--c-primary)) 24%,transparent)}.lo-card__lessons{display:grid;gap:6px;padding-top:14px;border-top:1px dashed var(--c-divider)}.lo-card__lesson{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--r-md);background:var(--c-surface-2);border:1px solid var(--c-divider);cursor:pointer;transition:background .12s,border-color .12s;text-align:left;font-family:inherit;width:100%}.lo-card__lesson:hover{background:var(--c-surface-sunken);border-color:var(--c-border-strong)}.lo-card__lesson-ic{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;background:var(--c-surface);border:1px solid var(--c-border);color:var(--subj,var(--c-primary));flex:none}.lo-card__lesson-text{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.lo-card__lesson-title{font-size:13.5px;font-weight:600;color:var(--c-fg);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lo-card__lesson-meta{font-family:var(--lo-mono);font-size:10.5px;letter-spacing:.06em;color:var(--c-fg-3)}.lo-card__lesson-arrow{width:24px;height:24px;display:grid;place-items:center;color:var(--c-fg-3);transition:transform .12s,color .12s}.lo-card__lesson:hover .lo-card__lesson-arrow{color:var(--subj,var(--c-primary));transform:translateX(2px)}.lo-empty{padding:64px 24px;text-align:center;background:var(--c-surface);border:1px 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