.learn-theme{--edube-red:#fe4536;--edube-orange:#fe7d47;--edube-yellow:#fec756;--edube-charcoal:#272727;--edube-charcoal-70:#5c5c5c;--edube-charcoal-90:#3a3a3a;--edube-grey:#afaeae;--edube-grey-light:#d9d8d8;--edube-cream:#efe6da;--edube-cream-soft:#f7f2ea;--edube-paper:#faf7f1;--edube-white:#fff;--edube-gradient:linear-gradient(135deg, #fe4536 0%, #fe7d47 50%, #fec756 100%);--edube-gradient-h:linear-gradient(90deg, #fe4536 0%, #fe7d47 60%, #fec756 100%);--bg:var(--edube-paper);--bg-soft:var(--edube-cream-soft);--bg-cream:var(--edube-cream);--bg-elevated:var(--edube-white);--bg-dark:var(--edube-charcoal);--fg:var(--edube-charcoal);--fg-muted:var(--edube-charcoal-70);--fg-subtle:var(--edube-grey);--fg-inverse:var(--edube-white);--accent:var(--edube-red);--accent-hover:#e53a2c;--accent-press:#cc3325;--accent-soft:#ffe9e4;--accent-warm:var(--edube-orange);--border:#2727271a;--border-strong:#2727272e;--focus-ring:#fe453652;--font-display:var(--font-manrope), var(--font-be-vietnam), system-ui, sans-serif;--font-body:var(--font-be-vietnam), var(--font-manrope), system-ui, sans-serif;--r-xs:4px;--r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:20px;--r-2xl:28px;--r-pill:999px;--shadow-xs:0 1px 2px #2727270d;--shadow-sm:0 2px 6px #2727270d, 0 1px 2px #2727270a;--shadow-md:0 8px 24px #27272714, 0 2px 4px #2727270a;--shadow-lg:0 20px 48px #2727271f, 0 4px 8px #2727270a;--ease-out:cubic-bezier(.22, .61, .36, 1);--dur-fast:.12s;--dur-base:.22s;background:var(--bg);color:var(--fg);font-family:var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh}.learn-theme .t-eyebrow{font-family:var(--font-display);letter-spacing:.18em;text-transform:uppercase;color:var(--fg-muted);font-size:11px;font-weight:600}.learn-theme .t-display-num{font-family:var(--font-display);font-feature-settings:"tnum" 1, "lnum" 1;font-weight:700}.learn-theme :focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px;border-radius:6px}
.learn-theme .app{flex-direction:column;min-height:100vh;display:flex}.learn-theme .app-header{z-index:30;background:color-mix(in oklab, var(--bg) 92%, transparent);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border);position:sticky;top:0}.learn-theme .app-header__inner{align-items:center;gap:16px;max-width:1480px;height:60px;margin:0 auto;padding:0 20px;display:flex}.learn-theme .brand{color:var(--fg);align-items:center;gap:10px;margin-right:8px;text-decoration:none;display:inline-flex}.learn-theme .brand__text{flex-direction:column;line-height:1.1;display:inline-flex}.learn-theme .brand__name{font-family:var(--font-display);letter-spacing:-.01em;font-size:16px;font-weight:800}.learn-theme .brand__name--gradient{background:var(--edube-gradient-h);-webkit-text-fill-color:transparent;color:#0000;-webkit-background-clip:text;background-clip:text}.learn-theme .brand__sub{letter-spacing:.14em;text-transform:uppercase;color:var(--fg);opacity:.78;margin-top:2px;font-size:10.5px;font-weight:600}.learn-theme .topnav{gap:4px;margin-left:24px;display:flex}.learn-theme .topnav__item{border-radius:var(--r-pill);color:var(--fg-muted);white-space:nowrap;transition:background var(--dur-fast) var(--ease-out);padding:8px 14px;font-size:14px;font-weight:500;text-decoration:none}.learn-theme .topnav__item:hover{color:var(--fg);background:#2727270d}.learn-theme .topnav__item--active{background:var(--bg-elevated);color:var(--fg);box-shadow:var(--shadow-xs);border:1px solid var(--border)}.learn-theme .app-header__right{align-items:center;gap:6px;margin-left:auto;display:flex}.learn-theme .header-progress-pill{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--r-pill);color:var(--fg-muted);align-items:center;gap:10px;margin-right:6px;padding:6px 14px;font-size:12.5px;display:inline-flex}.learn-theme .header-progress-pill__label{white-space:nowrap;font-weight:500}.learn-theme .header-progress-pill__bar{background:#2727271a;border-radius:999px;width:80px;height:4px;overflow:hidden}.learn-theme .header-progress-pill__fill{background:var(--edube-gradient-h);border-radius:999px;height:100%;display:block}.learn-theme .header-progress-pill__num{font-family:var(--font-display);color:var(--fg);font-variant-numeric:tabular-nums;font-weight:700}.learn-theme .header-lesson-meta{text-align:right;white-space:nowrap;flex-direction:column;flex-shrink:0;line-height:1.1;display:flex}.learn-theme .header-lesson-meta__pos{font-family:var(--font-display);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:14px;font-weight:700}.learn-theme .iconbtn{cursor:pointer;width:38px;height:38px;color:var(--fg-muted);transition:background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);background:0 0;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;display:inline-flex}.learn-theme .iconbtn:hover{color:var(--fg);background:#2727270f}.learn-theme .iconbtn--sm{border-radius:8px;width:30px;height:30px}.learn-theme .iconbtn[data-active]{background:var(--accent-soft);color:var(--accent);border-color:#fe453633}.learn-theme .header-bell{display:none}@media (min-width:768px){.learn-theme .header-bell{display:inline-flex}}.learn-theme .avatar{background:var(--edube-gradient);color:#fff;width:36px;height:36px;font-family:var(--font-display);cursor:pointer;border:0;border-radius:50%;justify-content:center;align-items:center;margin-left:4px;font-size:14px;font-weight:700;display:inline-flex;box-shadow:inset 0 1px #ffffff40}.learn-theme .reading-bar{background:#2727270f;height:2px}.learn-theme .reading-bar__fill{background:var(--edube-gradient-h);height:100%;transition:width .22s var(--ease-out)}.learn-theme .app-body{flex:1;align-items:stretch;width:100%;max-width:1480px;margin:0 auto;display:flex}.learn-theme .sidebar{border-right:1px solid var(--border);background:0 0;flex-direction:column;flex-shrink:0;align-self:flex-start;width:300px;height:calc(100vh - 60px);display:flex;position:sticky;top:60px}.learn-theme .sidebar__head{justify-content:space-between;align-items:center;padding:18px 18px 10px;display:flex}.learn-theme .sidebar__list{flex-direction:column;flex:1;gap:2px;padding:4px 10px 16px;display:flex;overflow-y:auto}.learn-theme .sidebar__foot{border-top:1px solid var(--border);padding:12px 14px}.learn-theme .streak-chip{border-radius:var(--r-pill);background:var(--bg-elevated);border:1px solid var(--border);color:var(--fg);align-items:center;gap:8px;padding:8px 12px;font-size:13px;text-decoration:none;display:inline-flex}.learn-theme .streak-chip strong{font-family:var(--font-display);font-weight:700}.learn-theme .mod{border-radius:var(--r-md);transition:background var(--dur-fast) var(--ease-out)}.learn-theme .mod--current{background:#fe45360a}.learn-theme .mod__head{border-radius:var(--r-md);cursor:pointer;text-align:left;width:100%;font:inherit;color:inherit;background:0 0;border:0;grid-template-columns:28px 1fr 16px;align-items:center;gap:12px;padding:10px 12px;display:grid}.learn-theme .mod__head:hover{background:#2727270a}.learn-theme .mod__head:disabled{cursor:not-allowed}.learn-theme .mod--locked .mod__head{background:0 0!important}.learn-theme .mod__num{font-family:var(--font-display);letter-spacing:.04em;color:var(--fg-muted);border:1px solid var(--border);font-variant-numeric:tabular-nums;background:0 0;border-radius:7px;justify-content:center;align-items:center;height:24px;font-size:12.5px;font-weight:700;display:inline-flex}.learn-theme .mod--current .mod__num{background:var(--accent);color:#fff;border-color:#0000}.learn-theme .mod--locked .mod__num{color:var(--fg-muted);opacity:.55}.learn-theme .mod__title{font-family:var(--font-display);color:var(--fg);min-width:0;font-size:13.5px;font-weight:600;line-height:1.4;display:block}.learn-theme .mod--current .mod__title{color:var(--fg)}.learn-theme .mod--locked .mod__title{color:var(--edube-charcoal-70);font-weight:500}.learn-theme .mod__chev{color:var(--fg-subtle)}.learn-theme .mod--locked .mod__chev{color:var(--edube-charcoal-70);opacity:.65}.learn-theme .mod__lessons{margin:0;padding:2px 0 8px 40px;list-style:none;position:relative}.learn-theme .mod__lessons:before{content:"";background:var(--border);width:1px;position:absolute;top:0;bottom:8px;left:26px}.learn-theme .lesson-link{color:var(--fg-muted);border-radius:8px;grid-template-columns:22px 1fr;align-items:center;gap:8px;padding:6px 10px 6px 6px;font-size:13px;line-height:1.4;text-decoration:none;display:grid;position:relative}.learn-theme .lesson-link:hover{color:var(--fg);background:#2727270a}.learn-theme .lesson-link__icon{justify-content:center;align-items:center;width:22px;height:22px;display:inline-flex}.learn-theme .lesson-link--done{color:var(--edube-charcoal-70)}.learn-theme .lesson-link--current{background:var(--accent-soft);color:var(--accent);font-weight:600}.learn-theme .lesson-link--current:before{content:"";background:var(--accent);border-radius:4px;width:3px;position:absolute;top:6px;bottom:6px;left:-14px}.learn-theme .sidebar--rail{width:64px}.learn-theme .sidebar--rail .sidebar__list{align-items:center;gap:6px;padding:4px 8px}.learn-theme .rail-mod{background:var(--bg-elevated);border:1px solid var(--border);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;width:44px;height:44px;display:inline-flex;position:relative}.learn-theme .rail-mod:hover{background:var(--bg-soft)}.learn-theme .rail-mod--current{background:var(--accent);border-color:#0000}.learn-theme .rail-mod--current .rail-mod__num{color:#fff}.learn-theme .rail-mod--locked{opacity:.5}.learn-theme .rail-mod__num{font-family:var(--font-display);font-variant-numeric:tabular-nums;color:var(--fg);font-size:13px;font-weight:700}.learn-theme .rail-mod__dot{border:2px solid var(--bg);box-sizing:content-box;border-radius:50%;width:6px;height:6px;position:absolute;bottom:6px;right:6px}.learn-theme .sidebar--drawer{background:var(--bg);border-right:1px solid var(--border);width:320px;max-width:84%;height:100vh;box-shadow:var(--shadow-lg);z-index:60;transition:transform .24s var(--ease-out);position:fixed;top:0;left:0;transform:translate(-100%)}.learn-theme .sidebar--drawer[data-open]{transform:translate(0)}.learn-theme .sidebar-scrim{z-index:55;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#27272752;position:fixed;inset:0}.learn-theme .sidebar--hidden{display:none!important}.learn-theme .sidebar-trigger{display:none}@media (max-width:1023px){.learn-theme .sidebar--desktop{display:none}.learn-theme .sidebar-trigger{display:inline-flex}}.learn-theme .mobile-tabbar{background:var(--bg);border-top:1px solid var(--border);padding:6px 4px max(6px, env(safe-area-inset-bottom));z-index:40;justify-content:space-around;display:flex;position:fixed;bottom:0;left:0;right:0}.learn-theme .mobile-tabbar__item{letter-spacing:.02em;color:var(--fg-subtle);cursor:pointer;background:0 0;border:0;border-radius:8px;flex-direction:column;flex:1;align-items:center;gap:4px;padding:8px 4px;font-size:10.5px;text-decoration:none;display:inline-flex}.learn-theme .mobile-tabbar__item--active,.learn-theme .mobile-tabbar__item[data-active],.learn-theme .mobile-tabbar__item--active svg{color:var(--accent)}.learn-theme .btn{font-size:14px;font-weight:600;font-family:var(--font-display);cursor:pointer;transition:background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);border:1px solid #0000;border-radius:10px;align-items:center;gap:8px;padding:9px 16px;text-decoration:none;display:inline-flex}.learn-theme .btn:disabled{opacity:.4;cursor:not-allowed}.learn-theme .btn--lg{padding:12px 20px;font-size:15px}.learn-theme .btn--primary{background:var(--accent);color:#fff;border-color:var(--accent)}.learn-theme .btn--primary:not(:disabled):hover{background:var(--accent-hover);border-color:var(--accent-hover)}.learn-theme .btn--secondary{color:var(--fg);border-color:var(--border-strong);background:#fff}.learn-theme .btn--secondary:not(:disabled):hover{background:var(--bg-soft)}.learn-theme .btn--ghost{color:var(--accent);background:0 0}.learn-theme .btn--ghost:hover{background:var(--accent-soft)}@media (max-width:1024px){.learn-theme .app-body{max-width:none}}@media (max-width:640px){.learn-theme .app-header__inner{gap:8px;height:56px;padding:0 12px}.learn-theme .brand{margin-right:0}}
.learn-theme .lesson-main{--font-display:var(--font-be-vietnam), var(--font-manrope), system-ui, sans-serif;flex:1;min-width:0;padding:36px 36px 80px}.learn-theme .lesson-shell{grid-template-columns:minmax(0, var(--lesson-w,760px)) minmax(0, 220px);justify-content:center;align-items:start;gap:56px;max-width:100%;margin:0 auto;display:grid}.learn-theme .lesson-content{min-width:0;max-width:var(--lesson-w,760px)}.learn-theme .lesson-aside{position:sticky;top:88px}.learn-theme .lesson-shell--single{grid-template-columns:minmax(0, var(--lesson-w,760px))}.learn-theme .lesson-aside:empty,.learn-theme .toc-inline{display:none}@media (max-width:1100px){.learn-theme .lesson-shell{grid-template-columns:minmax(0, var(--lesson-w,760px))}.learn-theme .lesson-aside{display:none}.learn-theme .toc-inline{display:block}}@media (max-width:1024px){.learn-theme .lesson-main{padding:28px 32px 60px}}@media (max-width:640px){.learn-theme .lesson-main{padding:22px 18px 110px}}.learn-theme .lesson-meta{color:var(--fg-muted);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:18px;font-size:12.5px;display:flex}.learn-theme .lesson-meta__crumb{align-items:center;gap:6px;min-width:0;display:inline-flex}.learn-theme .lesson-meta__crumb a{color:var(--fg-muted);text-overflow:ellipsis;white-space:nowrap;max-width:240px;text-decoration:none;overflow:hidden}.learn-theme .lesson-meta__crumb a:hover{color:var(--fg)}.learn-theme .lesson-meta__sep{color:var(--fg-subtle);opacity:.6}.learn-theme .lesson-meta__pos{font-family:var(--font-display);color:var(--fg);white-space:nowrap;font-weight:600}.learn-theme .lesson-meta__time{white-space:nowrap;align-items:center;gap:5px;display:inline-flex}.learn-theme .lesson-title{font-family:var(--font-display);letter-spacing:-.018em;color:var(--fg);text-wrap:balance;margin:0 0 18px;font-size:28px;font-weight:800;line-height:1.2}@media (max-width:640px){.learn-theme .lesson-title{letter-spacing:-.012em;font-size:22px}}.learn-theme .lesson-hook{background:var(--bg-cream);border-radius:var(--r-lg);border:1px solid #fec75666;grid-template-columns:auto 1fr;align-items:start;gap:16px;margin-bottom:32px;padding:18px 22px;display:grid;position:relative;overflow:hidden}.learn-theme .lesson-hook:before{content:"";background:var(--edube-gradient-h);width:4px;position:absolute;inset:0 auto 0 0}.learn-theme .lesson-hook__icon{width:38px;height:38px;color:var(--accent);background:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:inline-flex}.learn-theme .lesson-hook__eyebrow{color:var(--accent-press);margin-bottom:6px;display:block}.learn-theme .lesson-hook__body{color:var(--fg);margin:0;font-size:15px;font-weight:500;line-height:1.55}@media (max-width:640px){.learn-theme .lesson-hook{margin-bottom:22px;padding:14px 16px}.learn-theme .lesson-hook__body{font-size:14.5px}}.learn-theme .toc{padding-top:4px}.learn-theme .toc__title{margin-bottom:12px;display:block}.learn-theme .toc__list{border-left:1px solid var(--border);flex-direction:column;gap:2px;margin:0;padding:0;list-style:none;display:flex}.learn-theme .toc__item a{color:var(--fg-muted);transition:color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);border-left:1px solid #0000;gap:10px;margin-left:-1px;padding:7px 12px;font-size:13px;line-height:1.4;text-decoration:none;display:flex}.learn-theme .toc__item a:hover{color:var(--fg)}.learn-theme .toc__num{font-family:var(--font-display);color:var(--fg-subtle);font-variant-numeric:tabular-nums;letter-spacing:.02em;flex-shrink:0;padding-top:2px;font-size:11px;font-weight:600}.learn-theme .toc__item--active a{color:var(--accent);border-left-color:var(--accent);font-weight:600}.learn-theme .toc__item--active .toc__num{color:var(--accent)}.learn-theme .inline-toc{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--r-md);margin:8px 0 24px;overflow:hidden}.learn-theme .inline-toc>summary{cursor:pointer;color:var(--fg);align-items:center;gap:10px;padding:12px 16px;font-size:14px;font-weight:600;list-style:none;display:flex}.learn-theme .inline-toc>summary::-webkit-details-marker{display:none}.learn-theme .inline-toc__chev{transition:transform .2s var(--ease-out);margin-left:auto}.learn-theme .inline-toc[open] .inline-toc__chev{transform:rotate(180deg)}.learn-theme .inline-toc ol{border-top:1px solid var(--border);flex-direction:column;gap:4px;margin:0;padding:12px 16px;list-style:none;display:flex}.learn-theme .inline-toc ol li a{color:var(--fg-muted);gap:10px;padding:6px 0;font-size:14px;text-decoration:none;display:flex}.learn-theme .inline-toc ol li a:hover{color:var(--fg)}.learn-theme .prose-lesson{color:var(--fg);font-family:var(--font-body)}.learn-theme .prose-lesson>*+*{margin-top:14px}.learn-theme .prose-lesson p,.learn-theme .prose-lesson li{font-size:15px;line-height:1.65}.learn-theme .prose-lesson 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