:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f1e6;--surface:#fff;--sunk:#f1ebde;--beige:#e9e2d2;--line:#e7dfcf;--ink:#24372a;--forest:#183a24;--muted:#6e7468;--leaf:#1e9a4c;--on-leaf:#fff;--leaf-soft:#e2f2e4;--rind:#8cc152;--pulp:#dd2a6e;--pulp-soft:#fce5ee;--sun:#f6c445;--water:#3e8dc0;--ok:#1e9a4c;--ok-soft:#e2f2e4;--bad:#cf3f38;--bad-soft:#fce7e4;--warn:#b9701a;--warn-soft:#fbefd9;--shadow:0 1px 2px #28321e0d, 0 8px 24px #3c3c1e12;--font-body:"Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;--font-display:"Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;--side:350px}*{box-sizing:border-box}html{scroll-behavior:smooth}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}body{background:var(--bg);color:var(--ink);font:16px/1.7 var(--font-body);-webkit-font-smoothing:antialiased}a{color:var(--leaf)}:focus-visible{outline:3px solid var(--sun);outline-offset:2px;border-radius:8px}button{font:inherit;color:inherit}.shell{grid-template-columns:var(--side) minmax(0,1fr);min-height:100vh;display:grid}.sidebar{overscroll-behavior:contain;background:var(--surface);border-right:1px solid var(--line);height:100dvh;padding-block:24px 48px;padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:14px;position:sticky;top:0;overflow-y:auto}.brand{align-items:center;gap:12px;padding:0 6px 18px;display:flex}.brand svg{flex:none}.brand b{color:var(--forest);font-size:15.5px;font-weight:800;line-height:1.3;display:block}.brand span{color:var(--pulp);letter-spacing:.06em;text-transform:uppercase;font-size:12.5px;font-weight:600}.overall{background:var(--leaf-soft);border-radius:18px;margin:0 6px 16px;padding:14px 16px}.overall-row{color:var(--muted);font-variant-numeric:tabular-nums;justify-content:space-between;align-items:baseline;font-size:13px;display:flex}.overall-row b{color:var(--leaf);font-size:18px;font-weight:800}.bar{background:#1e9a4c26;border-radius:99px;height:8px;margin-top:8px;overflow:hidden}.bar i{background:var(--leaf);border-radius:99px;width:0;height:100%;transition:width .4s;display:block}.navlink{color:var(--forest);border-radius:14px;align-items:center;gap:10px;padding:11px 12px;font-size:14.5px;font-weight:700;text-decoration:none;display:flex}.navlink:hover{background:var(--sunk)}.navlink[aria-current=page]{background:var(--forest);color:#fff}.navlink[aria-current=page] svg{color:var(--sun)}.navlink svg{color:var(--leaf);flex:none}.part{border-top:1px dashed var(--line);margin-top:6px;padding-top:6px}.part-head{all:unset;box-sizing:border-box;cursor:pointer;border-radius:14px;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:4px 8px;width:100%;padding:12px 8px;display:grid}.part-head:hover{background:var(--sunk)}.part-head:focus-visible{outline:3px solid var(--sun)}.chev{color:var(--muted);transition:transform .2s}.part-head[aria-expanded=false] .chev{transform:rotate(-90deg)}.part-title{text-wrap:balance;color:var(--forest);font-size:15px;font-weight:800;line-height:1.35}.part-sub{color:var(--muted);grid-column:2;font-size:12.5px}.part-count{color:var(--muted);font-variant-numeric:tabular-nums;background:var(--sunk);border-radius:99px;grid-area:1/3/span 2;padding:3px 9px;font-size:12.5px;font-weight:700}.part-count.full{color:#fff;background:var(--leaf)}.items{margin:0;padding:0 0 6px;list-style:none}.item{color:var(--muted);border-radius:14px;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:10px;padding:10px 8px 10px 10px;font-size:14px;line-height:1.45;text-decoration:none;display:grid}.item:hover{background:var(--sunk);color:var(--ink)}.item[aria-current=page]{background:var(--leaf-soft);color:var(--forest);box-shadow:inset 3px 0 0 var(--leaf);font-weight:600}.dot{border:2px solid var(--beige);background:var(--surface);border-radius:50%;place-items:center;width:20px;height:20px;display:grid}.item.done .dot{background:var(--leaf);border-color:var(--leaf)}.item.done .dot:after{content:"";border-top:0;border-bottom:2px solid #fff;border-left:2px solid #fff;border-right:0;width:8px;height:4px;transform:rotate(-45deg)translate(1px,-1px)}.badge{background:var(--sunk);color:var(--muted);white-space:nowrap;border-radius:99px;padding:3px 10px;font-size:11.5px;font-weight:600}.item.quiz .badge{background:var(--pulp-soft);color:var(--pulp)}.topbar,.scrim{display:none}main{padding-block:48px 96px;min-width:0;padding-left:16px;padding-right:max(16px, env(safe-area-inset-right,0px));background:radial-gradient(circle at calc(100% + 60px) -60px, #dcefdf 0 260px, transparent 261px), radial-gradient(circle at -80px calc(100% + 40px), #fbe2eb 0 280px, transparent 281px), var(--bg)}.content{max-width:780px;margin:0 auto;padding-inline:clamp(0px,3vw,28px)}.view[hidden]{display:none}.eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--pulp);font-size:12.5px;font-weight:700}h1{font-family:var(--font-display);text-wrap:balance;letter-spacing:-.02em;color:var(--forest);margin:.35em 0 .55em;font-size:clamp(27px,3.3vw,36px);font-weight:800;line-height:1.18}h1 .h-accent{color:var(--leaf)}h2{font-family:var(--font-display);letter-spacing:-.015em;text-wrap:balance;color:var(--forest);margin:1.9em 0 .55em;font-size:25px;font-weight:800;line-height:1.25}h3{text-wrap:balance;color:var(--forest);letter-spacing:-.01em;margin:2em 0 .55em;font-size:19px;font-weight:800;line-height:1.4}p{margin:0 0 1em}.lead{color:var(--muted);font-size:18px;line-height:1.65}ul,ol{margin:0 0 1em;padding-left:1.3em}li{margin:.3em 0}li::marker{color:var(--leaf)}strong{color:var(--forest);font-weight:700}.sci{font-style:italic}.lesson-meta{color:var(--muted);flex-wrap:wrap;gap:8px 16px;margin-bottom:8px;font-size:13.5px;display:flex}figure{margin:1.6em 0}figure img{background:var(--sunk);width:100%;height:auto;box-shadow:var(--shadow);border-radius:20px;display:block}figcaption{color:var(--muted);margin-top:10px;font-size:13.5px;line-height:1.5}figure.narrow img{max-width:420px}figure.narrow.center img{margin-inline:auto}figure.narrow.center figcaption{text-align:center}.fig-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.fig-row figure{margin:0}.fig-row img{aspect-ratio:10/7;object-fit:cover}.facts{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:1.3em 0 1.5em;display:grid}.fact{background:var(--beige);border-radius:20px;min-width:0;padding:16px 18px}.fact dt{color:var(--forest);font-size:13px;font-weight:700}.fact dd{color:var(--muted);margin:4px 0 0;font-size:14px;line-height:1.45}.fact dd b{letter-spacing:-.02em;color:var(--forest);font-variant-numeric:tabular-nums;margin-bottom:2px;font-size:28px;font-weight:800;line-height:1.25;display:block}.fact:nth-child(4n+2){background:var(--leaf);box-shadow:var(--shadow)}.fact:nth-child(4n+2) dt,.fact:nth-child(4n+2) dd,.fact:nth-child(4n+2) dd b{color:#fff}.fact:nth-child(4n+2) dd{opacity:.9}.fact:nth-child(4n+3){background:var(--pulp-soft)}.fact:nth-child(4n+3) dt,.fact:nth-child(4n+3) dd b{color:var(--pulp)}.fact:nth-child(4n+4){background:var(--leaf-soft)}.fact:nth-child(4n+4) dd b{color:var(--leaf)}.table-wrap{background:var(--surface);box-shadow:var(--shadow);border-radius:20px;margin:1.3em 0 1.5em;overflow-x:auto}table{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%;font-size:14.5px}caption{caption-side:top;text-align:left;color:var(--forest);padding:16px 18px 6px;font-size:15px;font-weight:800}th,td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:11px 18px}thead th{letter-spacing:.08em;text-transform:uppercase;color:var(--forest);background:var(--sunk);font-size:12px;font-weight:700}tbody tr:last-child td{border-bottom:0}td.num,th.num{text-align:right;white-space:nowrap}.callout{border-radius:20px;margin:1.7em 0;padding:18px 20px}.callout>:last-child{margin-bottom:0}.callout .label{margin-bottom:4px;font-weight:800;display:block}.practice{background:var(--forest);color:#dcebdd;box-shadow:var(--shadow);position:relative;overflow:hidden}.practice:after{content:"";background:#8cc15238;border-radius:50%;width:120px;height:120px;position:absolute;bottom:-40px;right:-30px}.practice .label{color:#fff;font-size:16.5px}.practice p{z-index:1;position:relative}.practice strong{color:#fff}.note{background:var(--pulp-soft)}.note .label{color:var(--pulp)}.tip{background:var(--leaf-soft)}.tip .label{color:var(--leaf)}ol.steps{counter-reset:s;gap:12px;margin:1.3em 0 1.5em;padding:0;list-style:none;display:grid}ol.steps>li{counter-increment:s;background:var(--surface);box-shadow:var(--shadow);border-radius:18px;grid-template-columns:36px minmax(0,1fr);gap:14px;margin:0;padding:14px 16px;display:grid}ol.steps>li:before{content:counter(s);background:var(--leaf-soft);width:34px;height:34px;color:var(--leaf);border-radius:50%;place-items:center;font-size:15px;font-weight:800;display:grid}ol.steps>li:nth-child(2n):before{background:var(--pulp-soft);color:var(--pulp)}ol.steps>li>div>:last-child{margin-bottom:0}.timeline{border-left:3px dotted var(--rind);gap:16px;margin:1.3em 0 1.7em;padding:0;list-style:none;display:grid}.timeline li{margin:0;padding-left:22px;position:relative}.timeline li:before{content:"";background:var(--leaf);width:15px;height:15px;box-shadow:0 0 0 4px var(--bg);border-radius:50%;position:absolute;top:6px;left:-9px}.timeline li:nth-child(2n):before{background:var(--pulp)}.timeline .when{color:var(--forest);font-variant-numeric:tabular-nums;font-weight:800}.compare{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:1.3em 0;display:grid}.compare>div{background:var(--surface);min-width:0;box-shadow:var(--shadow);border-top:5px solid var(--leaf);border-radius:20px;padding:16px 18px}.compare>div:nth-child(2){border-top-color:var(--pulp)}.compare h4{color:var(--forest);margin:0 0 6px;font-size:16.5px;font-weight:800}.compare ul{margin:0}.diagram{background:var(--surface);box-shadow:var(--shadow);border-radius:20px;padding:14px;overflow-x:auto}.diagram svg{width:100%;min-width:520px;height:auto;display:block}.svg-txt{font:600 13px var(--font-body);fill:var(--ink)}.svg-small{font:12px var(--font-body);fill:var(--muted)}.calc{background:var(--surface);box-shadow:var(--shadow);border:2px solid var(--leaf-soft);border-radius:22px;margin:1.7em 0;padding:20px}.calc h4{color:var(--forest);margin:0 0 4px;font-size:17px;font-weight:800}.calc .hint{color:var(--muted);margin-bottom:14px;font-size:13.5px}.calc-inputs{flex-wrap:wrap;gap:12px;margin-bottom:14px;display:flex}.field{color:var(--forest);gap:4px;min-width:0;font-size:13px;font-weight:600;display:grid}.field input,.field select{font:inherit;color:var(--ink);background:var(--bg);border:1.5px solid var(--line);border-radius:12px;width:160px;max-width:100%;padding:9px 12px;font-size:15px;font-weight:500}.field input:focus,.field select:focus{border-color:var(--leaf);box-shadow:0 0 0 3px var(--leaf-soft);outline:none}.calc-out .table-wrap{box-shadow:none;border:1px solid var(--line);margin:0}.calc-sum{margin:0 0 12px;font-size:15px}.calc-sum b{color:var(--leaf);font-variant-numeric:tabular-nums;font-size:24px;font-weight:800}.btn{border:1.5px solid var(--line);background:var(--surface);cursor:pointer;color:var(--forest);border-radius:99px;align-items:center;gap:8px;padding:11px 20px;font-size:14.5px;font-weight:700;text-decoration:none;display:inline-flex}.btn:hover{border-color:var(--leaf)}.btn.primary{background:var(--leaf);border-color:var(--leaf);color:#fff;box-shadow:0 6px 16px #1e9a4c40}.btn.primary:hover{filter:brightness(1.06)}.btn.done{background:var(--leaf-soft);border-color:var(--leaf);color:var(--leaf)}.btn[disabled]{opacity:.5;cursor:not-allowed}.lesson-foot{border-top:1px dashed var(--beige);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-top:48px;padding-top:24px;display:flex}.lesson-foot .grp{flex-wrap:wrap;gap:10px;display:flex}.q{background:var(--surface);box-shadow:var(--shadow);border:0;border-radius:20px;margin:0 0 16px;padding:18px 20px}.q legend{float:left;width:100%;color:var(--forest);margin-bottom:10px;padding:0;font-size:16.5px;font-weight:700;line-height:1.5}.q legend span{background:var(--pulp-soft);color:var(--pulp);vertical-align:2px;font-variant-numeric:tabular-nums;border-radius:99px;margin-right:8px;padding:2px 10px;font-size:13px;font-weight:800;display:inline-block}.opt{clear:both;border:1.5px solid var(--line);cursor:pointer;background:var(--surface);border-radius:14px;grid-template-columns:20px minmax(0,1fr);align-items:start;gap:10px;margin-top:8px;padding:11px 14px;line-height:1.5;display:grid}.opt:hover{border-color:var(--leaf);background:#fbfdf9}.opt input{accent-color:var(--leaf);width:16px;height:16px;margin:3px 0 0}.opt.correct{border-color:var(--leaf);background:var(--leaf-soft)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}.explain{clear:both;color:var(--muted);background:var(--sunk);border-radius:12px;margin-top:12px;padding:10px 14px;font-size:14px}.explain b{color:var(--forest)}.result{border-radius:20px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;margin:0 0 18px;padding:16px 20px;font-weight:600;display:flex}.result.pass{background:var(--leaf);color:#fff}.result.fail{background:var(--pulp-soft);color:var(--pulp)}.result b{font-size:22px;font-weight:800}.quiz-msg{color:var(--bad);min-height:1.4em;font-size:14px}.hero{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:center;gap:24px;margin-bottom:8px;display:grid}.hero h1{margin-top:.25em;font-size:clamp(34px,4.6vw,50px);line-height:1.08}.hero-art svg{width:100%;max-width:100%;height:auto;display:block}.hero-meta{flex-wrap:wrap;gap:8px;margin:0 0 22px;display:flex}.chip{background:var(--forest);color:#fff;font-variant-numeric:tabular-nums;border-radius:99px;padding:6px 14px;font-size:13px;font-weight:700}.chip.light{background:var(--surface);color:var(--forest);box-shadow:var(--shadow)}.stat-tiles{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0 8px;display:grid}.tile{background:var(--beige);border-radius:20px;min-width:0;padding:16px 18px}.tile b{letter-spacing:-.02em;color:var(--forest);font-variant-numeric:tabular-nums;font-size:34px;font-weight:800;line-height:1.15;display:block}.tile span{color:var(--muted);font-size:13.5px}.tile small{color:var(--forest);margin-bottom:2px;font-size:13px;font-weight:700;display:block}.tile.green{background:var(--leaf);box-shadow:var(--shadow)}.tile.green b,.tile.green small{color:#fff}.tile.green span{color:#e3f4e6}.tile.pink{background:var(--pulp-soft)}.tile.pink b,.tile.pink small{color:var(--pulp)}.parts-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:1em 0;padding:0;list-style:none;display:grid}.parts-grid li{margin:0}.parts-grid a{height:100%;color:var(--ink);background:var(--surface);box-shadow:var(--shadow);border-radius:20px;padding:16px 18px;text-decoration:none;transition:transform .15s;display:block}.parts-grid a:hover{transform:translateY(-2px)}.parts-grid .pn{letter-spacing:.1em;text-transform:uppercase;color:var(--pulp);font-size:12px;font-weight:700}.parts-grid .pt{color:var(--forest);margin:2px 0 4px;font-size:16.5px;font-weight:800;display:block}.parts-grid .pd{color:var(--muted);font-size:14px;display:block}.parts-grid .pp{color:var(--leaf);background:var(--leaf-soft);font-variant-numeric:tabular-nums;border-radius:99px;margin-top:10px;padding:3px 10px;font-size:12.5px;font-weight:700;display:inline-block}.sources{color:var(--muted);background:var(--surface);box-shadow:var(--shadow);border-radius:20px;padding:16px 20px 16px 36px;font-size:14.5px}.reset-zone{color:var(--muted);flex-wrap:wrap;align-items:center;gap:10px;margin-top:28px;font-size:14px;display:flex}.items-wrap{grid-template-rows:1fr;transition:grid-template-rows .25s;display:grid}.items-wrap>.items{min-height:0;overflow:hidden}.part.closed .items-wrap{grid-template-rows:0fr}.part.closed .items{visibility:hidden;transition:visibility 0s linear .25s}.sheet-head,.mbar{display:none}@media (max-width:960px){.shell{display:block}.topbar{top:env(safe-area-inset-top,0px);z-index:20;text-align:left;cursor:pointer;background:var(--surface);border:0;border-bottom:1px solid var(--line);width:100%;padding-block:11px;padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));align-items:center;gap:10px;display:flex;position:sticky}body:before{content:"";height:env(safe-area-inset-top,0px);z-index:21;background:var(--surface);position:fixed;inset:0 0 auto}.topbar .t{min-width:0;color:var(--forest);white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:14.5px;font-weight:700;overflow:hidden}.topbar .p{color:var(--leaf);background:var(--leaf-soft);font-variant-numeric:tabular-nums;border-radius:99px;padding:2px 9px;font-size:12.5px;font-weight:700}.topbar svg{color:var(--muted);flex:none}.sidebar{z-index:40;width:auto;height:auto;max-height:calc(100vh - 56px);max-height:calc(100dvh - 56px - env(safe-area-inset-top,0px));visibility:hidden;padding-top:0;padding-bottom:calc(24px + env(safe-area-inset-bottom,0px));padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));border-right:0;border-radius:26px 26px 0 0;transition:transform .3s cubic-bezier(.2,.8,.2,1),visibility 0s linear .3s;position:fixed;inset:auto 0 0;transform:translateY(105%);box-shadow:0 -12px 40px #1e281438}body.nav-open .sidebar{visibility:visible;transition:transform .3s cubic-bezier(.2,.8,.2,1),visibility;transform:none}.sidebar.dragging{transition:none!important}.sheet-head{z-index:2;background:var(--surface);border-bottom:1px solid var(--line);touch-action:none;cursor:grab;margin:0 0 8px;padding:8px 0 10px;display:block;position:sticky;top:0}.grab{background:var(--beige);border-radius:99px;width:44px;height:5px;margin:0 auto 8px}.sheet-row{align-items:center;gap:10px;display:flex}.sheet-row b{color:var(--forest);flex:1;font-size:17px;font-weight:800}.sheet-close{all:unset;box-sizing:border-box;background:var(--sunk);width:40px;height:40px;color:var(--forest);cursor:pointer;border-radius:50%;flex:none;place-items:center;display:grid}.sheet-close:focus-visible{outline:3px solid var(--sun)}.brand{display:none}.overall{margin-inline:0}.part-head{padding:14px 8px}.item{min-height:48px;padding:12px 8px 12px 10px}.scrim{z-index:30;opacity:0;pointer-events:none;background:#18281c73;transition:opacity .25s;display:block;position:fixed;inset:0}body.nav-open .scrim{opacity:1;pointer-events:auto}body.nav-open{overflow:hidden}.mbar{z-index:25;background:var(--surface);border-top:1px solid var(--line);padding-top:8px;padding-bottom:calc(8px + env(safe-area-inset-bottom,0px));padding-left:max(16px, env(safe-area-inset-left,0px));padding-right:max(16px, env(safe-area-inset-right,0px));grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:8px;display:grid;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 16px #2828140f}.mbar .nav{min-height:44px;color:var(--forest);white-space:nowrap;border-radius:10px;align-items:center;gap:4px;padding:0 6px;font-size:14.5px;font-weight:700;text-decoration:none;display:flex}.mbar .nav.next{justify-content:flex-end}.mbar .nav[aria-disabled=true]{opacity:.3;pointer-events:none}.mbar .toc-btn{background:var(--forest);color:#fff;cursor:pointer;border:0;border-radius:99px;align-items:center;gap:8px;min-height:46px;padding:0 18px;font-size:15px;font-weight:700;display:inline-flex}.mbar .toc-btn .pct{color:var(--forest);background:var(--sun);font-variant-numeric:tabular-nums;border-radius:99px;padding:1px 7px;font-size:12px;font-weight:800}main{padding-block:28px calc(100px + env(safe-area-inset-bottom,0px));padding-left:max(16px, env(safe-area-inset-left,0px));background:radial-gradient(circle at calc(100% + 40px) -40px, #dcefdf 0 150px, transparent 151px), radial-gradient(circle at -60px calc(100% + 30px), #fbe2eb 0 170px, transparent 171px), var(--bg)}.content{padding-inline:0}}@media (max-width:640px){.hero{grid-template-columns:1fr}.hero-art{order:-1;max-width:340px;margin:0 auto}.facts,.compare,.parts-grid{grid-template-columns:1fr}.stat-tiles{grid-template-columns:1fr 1fr}.stat-tiles .tile:last-child{grid-column:1/-1}.fig-row{grid-template-columns:1fr}.fig-row img{aspect-ratio:auto}.lead{font-size:17px}.field input,.field select{width:100%}.calc-inputs .field{flex:130px}}
body{margin:0}.catalog-main,.checkout-main,.payment-main{background:var(--bg);overflow-wrap:anywhere;max-width:1240px;margin:auto;padding:40px 40px 80px}.catalog-main>h1,.checkout-main>h1,.payment-main>h1{max-width:900px;font-size:clamp(32px,4vw,48px)}.catalog-lead{color:var(--muted);max-width:620px;font-size:17px;line-height:1.9}.catalog-empty{color:var(--muted);padding:28px 0}.catalog-list{gap:32px;margin-top:40px;display:grid}.catalog-course{background:var(--surface);border-radius:22px;grid-template-columns:1fr 1fr;display:grid;overflow:hidden}.catalog-photo{min-width:0;display:block}.catalog-photo img{object-fit:cover;width:100%;height:100%;max-height:440px;display:block}.catalog-copy{min-width:0;padding:36px}.catalog-copy h2{letter-spacing:-.03em;font-size:clamp(24px,2.8vw,34px);line-height:1.25}.catalog-copy h2 a{color:var(--forest);text-decoration:none}.catalog-copy p{color:var(--muted);font-size:14px}.catalog-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;padding-top:12px;display:flex}.catalog-actions strong{color:var(--forest);font-size:21px}.catalog-course:not(:has(.catalog-photo)){grid-template-columns:1fr}.breadcrumbs{color:var(--muted);flex-wrap:wrap;gap:10px;margin-bottom:36px;font-size:12px;display:flex}.course-detail-hero{grid-template-columns:1.2fr 1fr;align-items:start;gap:56px;display:grid}.course-detail-hero>div{min-width:0}.course-detail-hero h1{font-size:clamp(30px,3.8vw,48px);line-height:1.2}.course-detail-photo{margin:0}.course-detail-photo img{object-fit:cover;border-radius:20px;width:100%;height:auto;max-height:560px}.course-detail-photo figcaption{color:var(--muted);margin-top:12px;font-size:11px}.course-price{color:var(--forest);margin:20px 0;font-size:28px;font-weight:700}.purchase-actions{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.public-syllabus{max-width:850px;margin:72px 0 0}.public-syllabus h2{margin:14px 0 12px;font-size:30px}.public-syllabus ol{margin:0 0 24px;padding-left:54px}.public-syllabus li{margin:12px 0;padding-left:4px;font-size:14px}.public-preview{background:var(--bg);overflow-wrap:anywhere}.public-preview .content{max-width:860px}.public-preview img{max-width:100%;height:auto}.public-preview .table-wrap,.public-preview .callout,.public-preview figure{box-shadow:none}.preview-footer{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:20px;margin-top:48px;padding-top:24px;display:flex}.preview-footer p{width:100%;color:var(--muted);font-size:14px}.checkout-grid{grid-template-columns:1fr 1.15fr;align-items:start;gap:40px;margin-top:36px;display:grid}.checkout-grid>section{min-width:0}.checkout-summary{padding:12px 20px 24px 0}.checkout-summary h2{font-size:26px;line-height:1.35}.checkout-summary p{color:var(--muted);font-size:14px}.checkout-summary dl,.order-details{grid-template-columns:auto minmax(0,1fr);gap:12px 24px;margin:28px 0;font-size:14px;display:grid}.checkout-summary dd,.order-details dd{text-align:right;overflow-wrap:anywhere;margin:0}.checkout-summary dt,.order-details dt{color:var(--muted)}.checkout-form-card,.payment-card{background:var(--surface);border-radius:22px;min-width:0;padding:32px}.checkout-form-card .auth-form{margin:0}.checkout-form-card h2{margin:0;font-size:22px}.checkout-form-card p{color:var(--muted);margin:0;font-size:14px}.checkbox-row{align-items:baseline;gap:12px;font-size:14px;display:flex}.checkbox-row input{width:auto}.payment-main{max-width:860px}.payment-card h2{margin-top:0;font-size:25px;line-height:1.35}.payment-card h3{margin-top:30px;font-size:18px}.mock-payment{text-align:center;margin-top:28px}.mock-payment .reader-notice{text-align:left}.mock-qr{background:var(--surface);border:1px solid var(--line);cursor:pointer;color:var(--forest);border-radius:18px;justify-items:center;gap:12px;padding:20px;font-size:14px;font-weight:600;display:inline-grid}.mock-qr:disabled{opacity:.6;cursor:wait}.demo-qr-image{width:200px;height:200px;fill:var(--forest);background:var(--surface)}.paid-details p{overflow-wrap:anywhere;font-size:14px}.order-history{padding:0;list-style:none}.order-history li{border-bottom:1px solid var(--line);padding:16px 0}.order-history span{color:var(--muted);margin-top:6px;font-size:12px;display:block}.invoice-order-id{overflow-wrap:anywhere;max-width:220px;font-size:11px;display:block}.admin-container{overflow-wrap:anywhere;min-width:0}.admin-container .table-wrap{box-shadow:none}.catalog-main .btn,.checkout-main .btn,.payment-main .btn,.public-preview .btn,.catalog-main .btn:hover,.checkout-main .btn:hover,.payment-main .btn:hover,.public-preview .btn:hover{box-shadow:none;transform:none}@media (max-width:760px){.catalog-main,.checkout-main,.payment-main{padding:24px 20px 60px}.catalog-course,.course-detail-hero,.checkout-grid{grid-template-columns:1fr;gap:28px}.catalog-course{gap:0}.catalog-copy{padding:28px}.catalog-photo img{aspect-ratio:1.4;object-fit:cover;max-height:300px}.catalog-lead{font-size:15px}.course-detail-hero h1{font-size:34px}.course-detail-photo{order:-1}.course-detail-photo img{max-height:320px}.checkout-summary{padding:0}.checkout-form-card,.payment-card{padding:24px}.checkout-summary dl,.order-details{gap:12px 16px}.purchase-actions{flex-direction:column;align-items:flex-start}.public-syllabus{margin-top:40px}.public-syllabus ol{padding-left:36px}.public-preview .content{padding-inline:0}.payment-card h2{font-size:23px}.site-header nav{gap:20px}}.learning-shell main{background:var(--bg)}.reader-brand{padding:0 12px 24px}.reader-brand p{color:var(--forest);font-size:14px;font-weight:700}.reader-brand>a:not(.wordmark){margin-right:16px;font-size:12px;display:inline-block}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.learning-shell .item{overflow-wrap:anywhere}.learning-shell .topbar .p{margin-left:8px}.lesson-progress{border-top:1px dashed var(--beige);flex-wrap:wrap;align-items:center;gap:10px;margin-top:48px;padding-top:24px;display:flex}.lesson-progress .auth-error{width:100%;margin:0}.reader-main .lesson-progress+.lesson-foot{border-top:0;margin-top:16px;padding-top:0}.reader-main:focus{outline:none}.reader-main img{max-width:100%;height:auto}.reader-main .lesson{overflow-wrap:anywhere}.reader-main .lesson h1{font-size:clamp(28px,3vw,42px)}.reader-main .callout,.reader-main figure,.reader-main .table-wrap,.reader-main .fact{box-shadow:none}.reader-main .table-wrap{max-width:100%}.reader-main .lesson-foot{flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:40px;display:flex}.reader-main .btn,.reader-main .btn:hover{box-shadow:none;transform:none}.reader-main .explain{display:block}.reader-notice{background:var(--leaf-soft);color:var(--forest);border-radius:12px;margin-bottom:28px;padding:16px 20px;font-size:13px}.reader-empty{padding:24px 0}.reader-empty h1{font-size:32px}.learning-shell .topbar button{background:var(--forest);width:100%;color:var(--surface);text-align:left;border:0;padding:14px 20px;font-size:13px}.learning-shell .scrim{border:0}.learning-shell .part-head{grid-template-columns:22px minmax(0,1fr)}.admin-container{max-width:960px;margin:auto}.admin-container h1{font-size:clamp(28px,4vw,40px)}.admin-card{background:var(--surface);border-radius:22px;margin:24px 0;padding:clamp(20px,4vw,40px)}.admin-card h2{font-size:22px}.admin-card p{color:var(--muted);font-size:14px}.admin-card .auth-form{max-width:none}.admin-card textarea{font:inherit;border:1px solid var(--line);resize:vertical;background:var(--surface);width:100%;min-height:100px;color:var(--ink);border-radius:8px;padding:12px}.admin-fields{border:0;gap:18px;min-width:0;margin:0;padding:0;display:grid}.preview-options{border:1px solid var(--line);border-radius:12px;min-width:0;padding:16px}.preview-options h3{font-size:14px}.preview-options label{align-items:baseline;gap:10px;margin:10px 0;font-size:13px;display:flex}.preview-options input{flex-shrink:0;width:auto}.admin-course-list{padding:0;list-style:none}.admin-course-list li{border-bottom:1px solid var(--line);justify-content:space-between;gap:16px;padding:16px 0;display:flex}.admin-course-list button{text-align:left;cursor:pointer;color:var(--forest);background:0 0;border:0;font-weight:600}.admin-course-list span{color:var(--muted);flex-shrink:0;font-size:12px}.publication{border-top:1px solid var(--line);margin-top:28px;padding-top:20px}@media (max-width:960px){.learning-shell .sidebar{visibility:hidden}.nav-open .learning-shell .sidebar{visibility:visible}.reader-main .content{padding-inline:0}.reader-main .lesson-foot{display:none}.learning-shell .sidebar .reader-brand{padding-top:20px}}.site-page{max-width:1440px;margin:auto}.site-header,.site-footer{justify-content:space-between;align-items:center;gap:24px;max-width:1240px;margin:auto;padding:30px 40px;display:flex}.site-header nav{align-items:center;gap:32px;display:flex}.wordmark{flex-shrink:0;line-height:1;text-decoration:none;display:inline-flex}.wordmark img{width:154px;height:auto;display:block}@media (max-width:760px){.wordmark img{width:126px}}.text-link{color:var(--forest);text-underline-offset:6px;font-size:14px;font-weight:600;text-decoration:underline;text-decoration-thickness:1px}.text-link:hover{color:var(--leaf)}.site-page .btn,.auth-main .btn{box-shadow:none;border-radius:10px;gap:20px;padding:13px 22px;transition:background-color .15s,color .15s;transform:none}.site-page .btn:hover,.auth-main .btn:hover{box-shadow:none;transform:none}.site-page .btn.primary:hover,.auth-main .btn.primary:hover{filter:none;background:var(--forest);border-color:var(--forest)}.home-hero>*,.featured-course>*,.course-outline>*{min-width:0}.home-main{background:var(--bg);max-width:1240px;margin:auto;padding:42px 40px 96px}.home-hero{grid-template-columns:1fr 1fr;align-items:center;gap:64px;padding-bottom:84px;display:grid}.hero-copy{padding:20px 0}.hero-copy h1{letter-spacing:-.045em;text-wrap:initial;max-width:600px;margin:24px 0;font-size:clamp(38px,4.6vw,65px);line-height:1.12}.hero-description{max-width:370px;color:var(--muted);margin-bottom:28px;font-size:17px;line-height:1.9}.hero-footnote{color:var(--muted);margin:18px 0 0;font-size:12px}.orchard-figure{min-width:0;margin:0}.orchard-figure img{object-fit:cover;object-position:60% center;width:100%;height:490px;box-shadow:none;border-radius:20px}.orchard-figure figcaption{color:var(--muted);justify-content:space-between;gap:12px;margin-top:16px;font-size:11px;display:flex}.orchard-figure figcaption span:first-child{color:var(--forest);font-weight:600}.h-accent{color:var(--leaf)}.course-section{border-top:1px solid var(--line);padding-top:52px;scroll-margin-top:28px}.section-heading{grid-template-columns:1.2fr 1fr;align-items:end;gap:64px;margin-bottom:32px;display:grid}.section-heading h2,.outline-intro h2{letter-spacing:-.035em;margin:14px 0 0;font-size:clamp(25px,2.6vw,36px);font-weight:700;line-height:1.3}.section-heading>p{max-width:350px;color:var(--muted);margin:0;font-size:15px}.featured-course{background:var(--surface);border-radius:22px;grid-template-columns:1fr 1fr;display:grid;overflow:hidden}.course-photo{min-width:0;position:relative}.course-photo img{object-fit:cover;width:100%;height:100%;min-height:420px;display:block}.course-copy{padding:40px}.course-status{color:var(--muted);padding-bottom:20px;font-size:12px;display:inline-block}.course-category{letter-spacing:.12em;color:var(--leaf);margin:0;font-size:10px;font-weight:600}.course-copy h3{letter-spacing:-.035em;margin:14px 0 20px;font-size:clamp(26px,3vw,38px);font-weight:700;line-height:1.2}.course-copy>p:not(.course-category){color:var(--muted);font-size:14px;line-height:1.85}.course-facts{grid-template-columns:1fr 1fr;gap:16px;margin:0;padding:20px 0 24px;display:grid}.course-facts dt{color:var(--muted);font-size:11px}.course-facts dd{color:var(--forest);margin:5px 0 0;font-size:12px;font-weight:600}.course-outline{grid-template-columns:1fr 1.35fr;gap:80px;padding-top:76px;scroll-margin-top:36px;display:grid}.outline-intro>p{color:var(--muted);max-width:290px;margin-top:20px;font-size:14px}.syllabus details{border-bottom:1px solid var(--line)}.syllabus summary{cursor:pointer;color:var(--forest);grid-template-columns:34px 1fr 16px;align-items:center;gap:14px;padding:22px 0;font-size:14px;font-weight:600;list-style:none;display:grid}.syllabus summary::-webkit-details-marker{display:none}.syllabus-number{color:var(--muted);font-variant-numeric:tabular-nums;font-size:11px;font-weight:400}.syllabus-toggle:before{content:"+";font-size:22px;font-weight:400;line-height:1}.syllabus details[open] .syllabus-toggle:before{content:"−"}.syllabus details p{color:var(--muted);margin:0 30px 24px 48px;font-size:14px}.site-footer{border-top:1px solid var(--line);padding-block:34px 48px}.site-footer p{color:var(--muted);margin:0 auto 0 18px;font-size:12px}.auth-main{background:var(--bg);min-height:100dvh;padding:32px 32px 64px}.auth-header{justify-content:space-between;align-items:center;gap:20px;max-width:1160px;margin:0 auto 44px;display:flex}.auth-container{background:var(--surface);border-radius:22px;grid-template-columns:1fr 1fr;max-width:1040px;margin:auto;display:grid;overflow:hidden}.login-aside{background:var(--forest);min-height:620px;position:relative}.login-aside img{object-fit:cover;width:100%;height:100%;position:absolute;inset:0}.login-aside figcaption{background:var(--bg);color:var(--forest);border-radius:12px;padding:20px;position:absolute;bottom:24px;left:24px;right:24px}.login-aside figcaption strong{margin-bottom:8px;font-size:19px;line-height:1.4;display:block}.login-aside figcaption span{color:var(--muted);font-size:12px}.login-aside{margin:0}.auth-card{background:var(--surface);min-width:0;padding:clamp(24px,4vw,52px)}.auth-card h1{letter-spacing:-.04em;margin:18px 0;font-size:clamp(28px,3vw,38px);line-height:1.22}.auth-card .lead{font-size:14px;line-height:1.8}.auth-form{gap:18px;margin-top:28px;display:grid}.auth-form .field{gap:8px;font-size:13px}.auth-form .field input{width:100%;font:inherit;background:var(--surface);border-radius:8px;padding:13px 14px}.auth-form .btn{justify-content:center;font-size:14px}.auth-hint{color:var(--muted);margin:0;font-size:13px}.auth-error{color:var(--bad);background:var(--bad-soft);overflow-wrap:anywhere;border-radius:10px;margin:0;padding:12px 16px;font-size:13px}.auth-actions{flex-wrap:wrap;gap:10px;display:flex}.auth-footer-note{color:var(--muted);margin:28px 0 0;font-size:12px}.account-container{max-width:900px;margin:auto}.account-container .auth-card{border-radius:22px;margin-bottom:24px;padding:clamp(24px,5vw,56px)}.account-container h2{letter-spacing:-.02em;font-size:20px;font-weight:700}.account-container p{color:var(--muted);font-size:14px}.account-container section[aria-labelledby=account-links-title]{border-bottom:1px solid var(--line);padding:8px 0 32px}.account-container .auth-form{max-width:420px}.device-list{margin-block:20px;padding:0;list-style:none}.device-list li{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;min-width:0;padding:20px 0;display:flex}.device-list li>div{overflow-wrap:anywhere;min-width:0;font-size:14px}.device-list small{color:var(--muted);margin-top:6px;font-size:12px;display:block}.device-list .badge{white-space:normal;background:var(--leaf-soft);color:var(--forest);margin-left:8px;display:inline-block}.device-list .btn{flex-shrink:0;font-size:12px}.account-details{border-bottom:1px solid var(--line);grid-template-columns:auto minmax(0,1fr);gap:10px 24px;padding-bottom:24px;font-size:14px;display:grid}.account-details dt{color:var(--muted);font-weight:500}.account-details dd{overflow-wrap:anywhere;color:var(--forest);margin:0}@media (max-width:960px){.home-hero{gap:32px}.hero-copy h1{font-size:46px}.orchard-figure img{height:440px}.course-copy{padding:28px}.course-outline{gap:40px}.auth-card{padding:32px}}@media (max-width:760px){.site-header,.site-footer{padding:24px 20px}.site-header nav{gap:16px}.catalog-link{display:none}.wordmark{font-size:30px}.site-header .btn{padding:11px 16px;font-size:12px}.home-main{padding:20px 20px 60px}.home-hero{grid-template-columns:1fr;gap:32px;padding-bottom:48px}.hero-copy{padding:10px 0 0}.hero-copy h1{margin-block:20px;font-size:clamp(38px,8vw,55px)}.hero-description{max-width:440px;font-size:15px}.orchard-figure img{aspect-ratio:1.25;object-position:center;height:auto}.orchard-figure figcaption{font-size:10px}.section-heading{grid-template-columns:1fr;gap:18px;margin-bottom:24px}.course-section{padding-top:32px}.featured-course{grid-template-columns:1fr}.course-photo img{aspect-ratio:1.45;object-fit:cover;height:auto;min-height:0}.course-copy{padding:28px}.course-copy h3{font-size:30px}.course-facts{gap:12px}.course-outline{grid-template-columns:1fr;gap:16px;padding-top:48px}.outline-intro>p{max-width:none}.site-footer{flex-wrap:wrap;gap:18px}.site-footer p{margin:0}.site-footer>a:last-child{margin-left:auto;font-size:12px}.auth-main{padding:24px 16px 48px}.auth-header{margin-bottom:28px}.auth-header .text-link{font-size:12px}.auth-container{grid-template-columns:1fr;max-width:480px}.login-aside{display:none}.auth-card{padding:28px 24px}.auth-card h1{font-size:30px}.account-details{grid-template-columns:1fr;gap:4px}.account-details dd{margin-bottom:12px}.device-list li{flex-direction:column;align-items:flex-start}.device-list .btn{padding:9px 14px}}.overall-link{color:var(--forest);margin-top:12px;font-size:13px;font-weight:700;display:inline-block}.certificate-note{color:var(--muted);margin-top:24px;font-size:13px}.certificate-remaining{color:var(--forest);margin:16px 0 24px;padding-left:20px;font-size:14px}.certificate-result .purchase-actions{margin-top:8px}.certificate-back{margin-top:28px}.reader-main{position:relative}.reader-watermark{z-index:3;pointer-events:none;background-repeat:repeat;position:absolute;inset:0}.reading-protected .reader-main .content{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}@media print{body.reading-protected>*{display:none!important}body.reading-protected:before{content:"Nội dung khoá học không hỗ trợ in.";padding:40px;font:16px/1.6 sans-serif;display:block}}.lesson-comments{border-top:1px dashed var(--beige);margin-top:56px;padding-top:28px}.lesson-comments h2{margin:0 0 16px;font-size:22px}.reading-protected .reader-main .lesson-comments{-webkit-user-select:text;user-select:text}.comment-form{gap:10px;margin-bottom:24px;display:grid}.comment-form .btn{justify-self:start}.field textarea{width:100%;font:inherit;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);resize:vertical;border-radius:8px;min-height:88px;padding:12px 14px;font-size:15px;font-weight:500}.field textarea:focus{border-color:var(--leaf);box-shadow:0 0 0 3px var(--leaf-soft);outline:none}.comment-hint,.comment-empty{color:var(--muted);margin:0;font-size:13px}.comment-list,.comment-replies{margin:0;padding:0;list-style:none}.comment{border-bottom:1px solid var(--line);padding:18px 0}.comment.hidden{opacity:.55}.comment-meta{color:var(--muted);margin:0 0 6px;font-size:12px}.comment-meta strong{color:var(--forest)}.comment-body{white-space:pre-wrap;overflow-wrap:anywhere;margin:0;font-size:15px}.comment-replies{background:var(--sunk);border-radius:14px;margin-top:12px;padding:4px 16px}.comment-replies .comment:last-child{border-bottom:0}.comment-admin{flex-wrap:wrap;gap:16px;margin-top:10px;font-size:13px;display:flex}.comment-admin .comment-form{width:100%;margin:8px 0 0}.lesson-comments button.text-link{font:inherit;cursor:pointer;background:0 0;border:0;padding:0}.comment-filter{flex-wrap:wrap;gap:10px;margin-bottom:16px;display:flex}.admin-card button.text-link{font:inherit;cursor:pointer;background:0 0;border:0;padding:0}.lesson-progress .sync-notice{width:100%;margin:0;font-size:13px}.account-nav-pending{visibility:hidden}.admin-home{margin:0;padding:0;list-style:none}.admin-home li{border-bottom:1px solid var(--line);padding:20px 0}.admin-home li:first-child{padding-top:0}.admin-home li:last-child{border-bottom:0;padding-bottom:0}.admin-home a{color:var(--forest);flex-wrap:wrap;justify-content:space-between;gap:6px 16px;font-size:18px;text-decoration:none;display:flex}.admin-home a:hover strong,.admin-home a:focus-visible strong{text-decoration:underline}.admin-home-note{color:var(--leaf);font-size:13px;font-weight:600}.admin-home p{color:var(--muted);margin:6px 0 0;font-size:14px}.admin-card h2{margin:0 0 12px;font-size:22px}.admin-hint{color:var(--muted);font-size:14px}.admin-stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:24px 0 0;display:grid}.admin-stats div{background:var(--surface);border-radius:18px;min-width:0;padding:18px 20px}.admin-stats dt{color:var(--muted);font-size:12px}.admin-stats dd{color:var(--forest);overflow-wrap:anywhere;font-variant-numeric:tabular-nums;margin:6px 0 0;font-size:22px;font-weight:700}.admin-search{flex-wrap:wrap;align-items:flex-end;gap:12px;margin:0 0 20px;display:flex}.admin-search .field{flex:260px;margin:0}.admin-search select,.admin-search input{width:100%;font:inherit;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;padding:12px 14px}.admin-sub{color:var(--muted);overflow-wrap:anywhere;margin-top:2px;font-size:12px;display:block}.admin-card table button.text-link,.admin-detail-head button.text-link{font:inherit;cursor:pointer;text-align:left;background:0 0;border:0;padding:0;font-weight:600}.admin-card tr.selected td{background:var(--leaf-soft)}.admin-detail-head{justify-content:space-between;align-items:baseline;gap:16px;display:flex}.admin-card h3{margin:28px 0 8px;font-size:17px}.admin-list{margin:0 0 12px;padding:0;list-style:none}.admin-list li{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 16px;padding:14px 0;display:flex}.admin-list li>div{flex:240px;min-width:0}.admin-confirm{flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;display:flex}.admin-toolbar{margin:0 0 16px}@media (max-width:760px){.admin-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-stats dd{font-size:18px}}.admin-card td,.admin-card th{overflow-wrap:normal}.admin-card td .admin-sub{overflow-wrap:anywhere;min-width:12ch}.admin-card td:first-child{min-width:180px}.admin-card td .btn{white-space:nowrap}