@font-face{font-family:GeistSans;src:url(/_next/static/media/0b78ff376f6b9734-s.p.woff2) format("woff2");font-display:swap;font-weight:100 900}@font-face{font-family:GeistSans Fallback;src:local("Arial");ascent-override:94.56%;descent-override:27.76%;line-gap-override:0.00%;size-adjust:106.28%}.__className_8adcd2{font-family:GeistSans,GeistSans Fallback}.__variable_8adcd2{--font-geist-sans:"GeistSans","GeistSans Fallback"}@font-face{font-family:GeistMono;src:url(/_next/static/media/723e11e5093b8e80.p.woff2) format("woff2");font-display:swap;font-weight:100 900}.__className_46451f{font-family:GeistMono,ui-monospace,SFMono-Regular,Roboto Mono,Menlo,Monaco,Liberation Mono,DejaVu Sans Mono,Courier New,monospace}.__variable_46451f{--font-geist-mono:"GeistMono",ui-monospace,SFMono-Regular,Roboto Mono,Menlo,Monaco,Liberation Mono,DejaVu Sans Mono,Courier New,monospace}:root{--bg:#0a0a0b;--bg2:#111114;--bg3:#17171a;--bg-hover:#1d1d21;--border:#232327;--border2:#2e2e34;--text:#ededee;--dim2:#c4c4cc;--dim:#a1a1aa;--faint:#71717a;--accent:#5b8cff;--accent-press:#4575f0;--accent-soft:rgba(91,140,255,.12);--accent2:#a78bfa;--green:#3fb27f;--amber:#d6a23e;--red:#e5635f;--teal:#45b3c0;--font-sans:var(--font-geist-sans),-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--font-mono:var(--font-geist-mono),ui-monospace,Menlo,Consolas,monospace;--fs-xs:11.5px;--fs-sm:13px;--fs-base:15px;--fs-lg:17px;--fs-xl:22px;--fs-2xl:28px;--fs-3xl:40px;--sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:20px;--sp-6:24px;--sp-8:32px;--sp-10:40px;--sp-12:56px;--radius:10px;--r-sm:6px;--r-md:10px;--r-lg:14px;--r-xl:20px;--shadow-1:0 1px 2px rgba(0,0,0,.4),0 2px 6px rgba(0,0,0,.28);--shadow-2:0 8px 30px rgba(0,0,0,.45);--hairline:inset 0 1px 0 rgba(255,255,255,.04)}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--text);font-family:var(--font-sans);line-height:1.55;font-size:var(--fs-base);letter-spacing:.005em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;gap:7px;background:var(--accent);color:#08080a;border:none;padding:10px 18px;border-radius:var(--r-md);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;box-shadow:var(--shadow-1);transition:transform .12s,background .15s,box-shadow .15s,filter .15s}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-2);filter:brightness(1.05)}.btn:active{transform:translateY(0);background:var(--accent-press)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:var(--shadow-1);filter:none}.btn.ghost{background:var(--bg3);color:var(--text);border:1px solid var(--border2);box-shadow:var(--hairline)}.btn.ghost:hover{background:var(--bg-hover);border-color:#3a3a42;filter:none}.btn.green{background:var(--green);color:#08080a}.btn.amber{background:var(--amber);color:#08080a}.btn.red{background:var(--red);color:#fff}.btn.sm{padding:6px 12px;font-size:13px}.btn svg{flex-shrink:0}.wrap{max-width:860px;margin:0 auto;padding:0 20px}.card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);padding:18px 20px;margin-bottom:14px;box-shadow:var(--shadow-1),var(--hairline);transition:border-color .2s,transform .15s}.card:hover{border-color:var(--border2)}.spinner{width:34px;height:34px;border:3px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.siteheader{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--border);max-width:1000px;margin:0 auto}.sh-logo{display:inline-flex;align-items:center;gap:8px;color:var(--text);font-weight:700;font-size:15px;letter-spacing:-.01em}.sh-logo svg{color:var(--accent)}.sh-logo:hover{text-decoration:none}.sh-nav{display:flex;align-items:center;gap:18px}.sh-nav a{color:var(--dim2);font-size:14px}.siteheader-bar{position:-webkit-sticky;position:sticky;top:0;z-index:40;background:rgba(10,10,11,.72);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.siteheader-bar .siteheader{border-bottom:none}.eyebrow{color:var(--accent);font-weight:600;font-size:var(--fs-sm);letter-spacing:.04em}.hero-bg{background:radial-gradient(900px 500px at 50% -10%,var(--accent-soft),transparent 60%)}.statrow{display:flex;gap:28px;justify-content:center;flex-wrap:wrap}.checklist{list-style:none;margin:12px 0;display:grid;grid-gap:4px;gap:4px}.checklist li{display:flex;align-items:center;gap:9px;padding:4px 0;color:var(--dim2)}.checklist li svg{color:var(--green);flex-shrink:0}.brandmark{display:inline-flex;align-items:center;gap:8px;font-weight:700;letter-spacing:-.01em}.brandmark svg{color:var(--accent)}.authcard{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);padding:28px 26px;box-shadow:var(--shadow-2),var(--hairline)}.input{width:100%;padding:11px 14px;border-radius:var(--r-md);border:1px solid var(--border2);background:var(--bg3);color:var(--text);font-family:inherit;font-size:14px;box-shadow:var(--hairline);outline:none;transition:border-color .15s,box-shadow .15s}.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}#app{display:flex;min-height:100vh}#side{width:300px;background:var(--bg2);border-right:1px solid var(--border);padding:22px 16px;position:fixed;top:0;bottom:0;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--border2) transparent}#side::-webkit-scrollbar{width:8px}#side::-webkit-scrollbar-thumb{background:var(--border2);border-radius:4px}#side h1{display:flex;align-items:center;gap:8px;font-size:15.5px;font-weight:700;letter-spacing:-.01em;margin-bottom:2px;color:var(--text)}#side h1 svg{color:var(--accent);flex-shrink:0}#side .sub{font-size:11.5px;color:var(--faint);margin-bottom:12px}.sideprog{margin:0 2px 12px;font-size:11px;color:var(--dim)}.navbtn{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:none;border:none;color:var(--dim2);padding:8px 12px;border-radius:var(--r-sm);cursor:pointer;font-family:inherit;font-size:13.5px;margin-bottom:2px;position:relative;transition:background .15s,color .15s}.navbtn svg{width:16px;height:16px;flex-shrink:0;opacity:.85}.navbtn:hover{background:var(--bg3);color:var(--text)}.navbtn.active{background:var(--accent-soft);color:var(--text);font-weight:600}.navbtn.active svg{opacity:1;color:var(--accent)}.navbtn.active:before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:2.5px;border-radius:2px;background:var(--accent)}.blockhead{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--faint);margin:16px 6px 6px;display:flex;justify-content:space-between;align-items:center}.blockhead .bm{font-size:10px;padding:1px 7px;border-radius:9px;border:1px solid var(--border2)}.bm.done{color:var(--green);border-color:var(--green)}.dot{width:8px;height:8px;border-radius:50%;background:var(--border2);flex-shrink:0}.dot.read{background:var(--amber)}.dot.mastered{background:var(--green)}#main{margin-left:300px;flex:1 1;padding:42px 56px;max-width:1180px}.page{animation:fadein .25s ease;max-width:880px}@keyframes fadein{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}h2{font-size:var(--fs-2xl);margin-bottom:4px;letter-spacing:-.02em}h2,h3{font-weight:600;color:var(--text)}h3{font-size:var(--fs-lg);margin:24px 0 8px;letter-spacing:-.01em}h4{font-size:14.5px;font-weight:600;margin:16px 0 6px;color:var(--accent2)}.page p{margin-bottom:10px;color:var(--dim2)}.tagline{color:var(--dim);font-size:14px;margin-bottom:16px}.mental{border-left:2px solid var(--accent2);background:linear-gradient(90deg,rgba(167,139,250,.08),transparent);padding:12px 16px}.mental,.worked{border-radius:0 var(--r-md) var(--r-md) 0;margin:12px 0;font-size:14.5px}.worked{border-left:2px solid var(--teal);background:linear-gradient(90deg,rgba(69,179,192,.07),transparent);padding:14px 18px;color:var(--dim2)}.buildbox{border:1px dashed var(--amber);border-radius:var(--r-md);padding:14px 18px;margin:12px 0;font-size:14.5px}.buildbox b{color:var(--amber)}.pill{display:inline-block;font-size:11px;padding:2px 9px;border-radius:9px;margin-right:6px;border:1px solid var(--border2);color:var(--faint)}.pill.new{color:var(--teal);border-color:rgba(69,179,192,.5)}.pill.upd{color:var(--amber);border-color:rgba(214,162,62,.5)}.term{margin-bottom:9px}.term b{color:var(--text)}.term span{color:var(--dim)}ul.flat{list-style:none}ul.flat li{padding:5px 0 5px 22px;position:relative;color:var(--dim2);font-size:14px}ul.flat li:before{content:"›";position:absolute;left:6px;color:var(--accent)}ul.flags li:before{content:"⚑";color:var(--red);font-size:12px}ul.checks li:before{content:"✓";color:var(--green)}.btn{margin:4px 6px 4px 0}.btn:focus-visible,.opt:focus-visible,.tab:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin:18px 0 20px;flex-wrap:wrap}.tab{display:inline-flex;align-items:center;gap:7px;padding:9px 16px;background:none;color:var(--dim);cursor:pointer;font-family:inherit;font-size:14px;font-weight:600;border:none;border-bottom:2px solid transparent;margin-bottom:-1px;transition:color .15s}.tab svg{width:15px;height:15px}.tab:hover{color:var(--text)}.tab.active{color:var(--accent);border-bottom-color:var(--accent)}.tab:disabled{cursor:not-allowed}.opt{display:flex;align-items:flex-start;gap:11px;width:100%;text-align:left;background:var(--bg3);border:1px solid var(--border2);color:var(--text);padding:12px 15px;border-radius:var(--r-md);margin-bottom:8px;cursor:pointer;font-family:inherit;font-size:14px;line-height:1.45;box-shadow:var(--hairline);transition:border-color .15s,background .15s,transform .1s}.opt:hover{border-color:var(--accent)}.opt:hover:not(.right):not(.wrong){transform:translateX(2px)}.opt.sel{border-color:var(--accent);background:var(--accent-soft)}.opt.right{border-color:var(--green);background:rgba(63,178,127,.13)}.opt.wrong{border-color:var(--red);background:rgba(229,99,95,.12)}.chip{flex-shrink:0;width:24px;height:24px;border-radius:7px;background:var(--bg);border:1px solid var(--border2);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--dim)}.opt.right .chip{background:var(--green);color:#08080a;border-color:var(--green)}.opt.wrong .chip{background:var(--red);color:#fff;border-color:var(--red)}.opt.sel .chip{background:var(--accent);color:#08080a;border-color:var(--accent)}.exp{font-size:13.5px;background:var(--bg3);border-radius:var(--r-sm);padding:10px 14px;margin:8px 0 16px;border-left:2px solid var(--accent)}.exp,.qnum{color:var(--dim)}.qnum{font-size:12px;margin-bottom:4px}.qtext{font-size:15px;font-weight:600;margin-bottom:10px}.bar{height:8px;background:var(--bg3);overflow:hidden;margin:6px 0 2px;box-shadow:var(--hairline)}.bar,.bar i{border-radius:5px}.bar i{display:block;height:100%;background:var(--accent);transition:width .4s}.bar i.g{background:var(--green)}.statgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:12px;gap:12px;margin:14px 0}.stat{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-lg);padding:16px 18px;box-shadow:var(--shadow-1),var(--hairline)}.stat .big{font-size:var(--fs-2xl);font-weight:700;color:var(--accent);letter-spacing:-.02em}.stat .lbl{font-size:12px;color:var(--dim)}.flipwrap{perspective:1400px;margin-bottom:16px;cursor:pointer}.flipinner{position:relative;width:100%;min-height:230px;transition:transform .5s cubic-bezier(.4,.1,.2,1);transform-style:preserve-3d}.flipwrap.flipped .flipinner{transform:rotateY(180deg)}.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;display:flex;align-items:center;justify-content:center;text-align:center;padding:30px 34px;background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r-lg);font-size:17px;line-height:1.5;box-shadow:var(--shadow-1),var(--hairline)}.face.front{border-color:var(--border2)}.face.back{transform:rotateY(180deg);color:var(--teal);font-size:15px;border-color:rgba(69,179,192,.5)}.kbd{display:inline-block;background:var(--bg3);border:1px solid var(--border2);border-radius:4px;padding:1px 5px;font-size:10px;font-family:var(--font-mono)}.boxtag,.kbd{color:var(--dim)}.boxtag{font-size:11px;display:block;margin-top:8px}.scenario-sit{background:var(--bg3);border-radius:var(--r-sm);padding:13px 16px;margin-bottom:10px;font-size:14.5px;box-shadow:var(--hairline)}.model-ans{border-left:2px solid var(--green);background:rgba(63,178,127,.06);padding:12px 16px;border-radius:0 var(--r-sm) var(--r-sm) 0;margin:10px 0;font-size:14px}.badge{display:inline-block;padding:2px 10px;border-radius:9px;font-size:11.5px;font-weight:600;margin-left:8px}.badge.pass{background:rgba(63,178,127,.15);color:var(--green);border:1px solid var(--green)}.badge.fail{background:rgba(229,99,95,.12);color:var(--red);border:1px solid var(--red)}.page table{width:100%;border-collapse:collapse;margin:10px 0;font-size:13.5px}.page td,.page th{border:1px solid var(--border);padding:7px 10px;text-align:left}.page th{color:var(--dim);font-size:12px;text-transform:uppercase;letter-spacing:.04em}.page code,.page th{background:var(--bg3)}.page code{padding:1px 6px;border-radius:5px;font-size:13px;color:var(--teal);font-family:var(--font-mono)}.res-item{display:block;padding:13px 16px;border:1px solid var(--border);border-radius:var(--r-md);margin-bottom:10px;background:var(--bg2);box-shadow:var(--hairline);transition:border-color .2s}.res-item:hover{border-color:var(--accent)}.res-item a{color:var(--accent);text-decoration:none;font-weight:600;font-size:14.5px}.res-item a:hover{text-decoration:underline}.when{display:block;color:var(--dim);font-size:13px;margin-top:3px}.when b{color:var(--accent2);font-weight:600}.topbar{margin-bottom:20px}.actionbar,.topbar{display:flex;gap:8px;flex-wrap:wrap}.actionbar{position:-webkit-sticky;position:sticky;bottom:0;background:linear-gradient(transparent,var(--bg) 35%);padding:18px 0 10px;margin-top:8px}.mech{font-size:14.5px;line-height:1.65}.mech b{color:var(--teal)}details.deep{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-md);padding:12px 18px;margin-bottom:12px;box-shadow:var(--hairline)}details.deep summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--amber);list-style:none;display:flex;align-items:center;gap:7px}details.deep summary::-webkit-details-marker{display:none}details.deep summary:before{content:"▸";transition:transform .2s;color:var(--faint)}details.deep[open] summary:before{content:"▾"}details.deep ul{margin-top:8px}details.deep summary svg{width:15px;height:15px}.codeblock{background:#08080a;border:1px solid var(--border);border-radius:var(--r-md);padding:16px 18px;font-family:var(--font-mono);font-size:12px;line-height:1.6;color:#c9d1d9;overflow-x:auto;white-space:pre;margin:10px 0;box-shadow:var(--hairline)}#gradebtns{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}.mlw{display:flex;align-items:flex-start;gap:24px}.mlw>.page{flex:1 1;min-width:0;max-width:940px}.sec-rail{width:148px;flex-shrink:0;position:-webkit-sticky;position:sticky;top:32px;max-height:calc(100vh - 64px);overflow-y:auto;scrollbar-width:none;display:flex;flex-direction:column;gap:2px;padding-top:2px}.sec-rail::-webkit-scrollbar{display:none}.sr-item{display:block;padding:5px 10px;border-radius:var(--r-sm);border:1px solid transparent;font-size:11.5px;color:var(--dim);text-decoration:none;line-height:1.35;transition:color .15s,background .15s,border-color .15s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer;background:none;text-align:left;font-family:inherit}.sr-item:hover{color:var(--text);background:var(--bg3)}.sr-item.sr-active{color:var(--accent);background:var(--accent-soft);border-color:rgba(91,140,255,.25);font-weight:600}@media (max-width:1060px){.sec-rail{width:116px}.sr-item{font-size:11px;padding:4px 7px}}.pblock{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r-md);padding:16px 20px;margin-bottom:12px;box-shadow:var(--shadow-1),var(--hairline);transition:border-color .2s}.pb-done{border-color:rgba(63,178,127,.35)}.pb-cur{border-color:var(--accent)}.pb-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.pb-name{font-size:15px;font-weight:600}.pb-chip{font-size:10.5px;font-weight:700;padding:2px 8px;border-radius:8px;border:1px solid;vertical-align:middle}.pb-chip-g{color:var(--green);border-color:var(--green)}.pb-chip-a{color:var(--accent);border-color:var(--accent)}.pb-rows{display:flex;flex-direction:column}.pb-row{display:flex;align-items:center;gap:10px;padding:4px 6px;border-radius:var(--r-sm);min-height:28px}.pb-row-cur{background:var(--accent-soft);margin:0 -6px;padding:4px 12px}.pb-exam{border-top:1px solid var(--border);margin-top:4px;padding-top:8px}.pb-btn{flex:1 1;text-align:left;background:none;border:none;cursor:pointer;font-family:inherit;font-size:13.5px;color:var(--text);padding:0;line-height:1.3}.pb-btn:hover{color:var(--accent)}.pb-stat{font-size:11.5px;color:var(--dim);flex-shrink:0;white-space:nowrap}.pb-stat-g{color:var(--green)}.pb-stat-a{color:var(--amber)}.est-meta{display:block;font-size:11.5px;color:var(--dim);margin:-2px 0 12px;font-weight:400}.est-meta-done{color:var(--green)}.est-block{font-size:12px;color:var(--dim);font-weight:400;margin-left:10px;vertical-align:baseline}#course-topbar{display:none}#scrim{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:50;opacity:0;pointer-events:none;transition:opacity .25s}#scrim.show{opacity:1;pointer-events:auto}.xpbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:0 2px 14px;font-size:11.5px;color:var(--dim)}.xpbar .streak{display:inline-flex;align-items:center;gap:4px;color:var(--amber);font-weight:600}.xpbar .streak svg{width:13px;height:13px}.xpbar .lvl{color:var(--accent2);font-weight:600}.xpbar .xptrack{flex:1 1 60px;min-width:60px;height:6px;background:var(--bg3);border-radius:4px;overflow:hidden;box-shadow:var(--hairline)}.xpbar .xptrack i{display:block;height:100%;background:var(--accent2);border-radius:4px;transition:width .4s}.xpbar .xptxt{width:100%;color:var(--dim)}.herostat{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.herostat .hs-cell{min-width:80px}.herostat .hs-grow{flex:1 1 220px}.herostat .hs-big{font-size:24px;font-weight:700;color:var(--accent);letter-spacing:-.02em}.herostat .hs-cell:first-child .hs-big{color:var(--amber)}.goalpill,.herostat .hs-lbl{font-size:12px;color:var(--dim)}.goalpill{display:inline-flex;align-items:center;gap:6px;padding:3px 12px;border-radius:12px;border:1px solid var(--border2)}.goalpill.done{color:var(--green);border-color:var(--green)}.goalpill svg{width:13px;height:13px}.themebtn{display:inline-flex;align-items:center;gap:7px;margin:2px 2px 12px;background:var(--bg3);border:1px solid var(--border2);color:var(--dim2);font-family:inherit;font-size:12px;padding:6px 12px;border-radius:var(--r-sm);cursor:pointer;box-shadow:var(--hairline);transition:background .15s,color .15s}.themebtn:hover{background:var(--bg-hover);color:var(--text)}.themebtn svg{width:14px;height:14px}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,16px);background:var(--bg2);border:1px solid var(--green);color:var(--text);padding:12px 20px;border-radius:var(--r-md);font-size:14px;font-weight:600;z-index:90;opacity:0;transition:opacity .25s,transform .25s;box-shadow:var(--shadow-2);max-width:90vw;text-align:center}.toast.show{opacity:1;transform:translate(-50%)}.confetti{position:fixed;inset:0;pointer-events:none;z-index:80;overflow:hidden}.confetti i{position:absolute;top:-12px;width:9px;height:14px;border-radius:2px;opacity:.95;animation:conffall linear forwards}@keyframes conffall{0%{transform:translateY(-10px) rotate(0);opacity:1}to{transform:translateY(105vh) rotate(2turn);opacity:.9}}@media (prefers-reduced-motion:reduce){.confetti{display:none}}.qhint{font-size:12px;color:var(--dim);margin:10px 0 2px}.flipwrap:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:var(--r-lg)}.scen-note{display:block;width:100%;min-height:96px;background:var(--bg3);border:1px solid var(--border2);border-radius:var(--r-md);color:var(--text);font-size:14px;line-height:1.5;padding:12px 14px;margin:6px 0 12px;resize:vertical;font-family:inherit;outline:none;box-shadow:var(--hairline);transition:border-color .15s,box-shadow .15s}.scen-note:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.your-ans{border-left:2px solid var(--accent);background:var(--accent-soft);padding:12px 16px;border-radius:0 var(--r-sm) var(--r-sm) 0;margin:10px 0;font-size:14px}.lockcard{border:1px solid rgba(167,139,250,.4);border-radius:var(--r-lg);padding:22px 24px;margin:16px 0;background:linear-gradient(135deg,rgba(167,139,250,.07),transparent 70%);box-shadow:var(--shadow-1),var(--hairline)}.lockcard h3{display:flex;align-items:center;gap:9px;color:var(--accent2);margin-top:0}.lockcard h3 svg{flex-shrink:0}@media (max-width:860px){#course-topbar{display:flex;align-items:center;gap:12px;position:-webkit-sticky;position:sticky;top:0;z-index:40;background:rgba(17,17,20,.85);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);padding:10px 14px}#navtoggle{justify-content:center;background:var(--bg3);border:1px solid var(--border2);color:var(--text);padding:6px 10px;border-radius:var(--r-sm);cursor:pointer}#course-topbar .tb-title,#navtoggle{display:inline-flex;align-items:center}#course-topbar .tb-title{gap:7px;font-size:14px;font-weight:600}#course-topbar .tb-title svg{color:var(--accent)}#app{flex-direction:column}#main{margin-left:0;padding:18px}#side{position:fixed;top:0;left:0;bottom:0;width:280px;max-width:84vw;height:auto;z-index:60;transform:translateX(-100%);transition:transform .25s ease;border-right:1px solid var(--border);box-shadow:var(--shadow-2)}#side.drawer-open{transform:none}.mlw{flex-direction:column;gap:0}.sec-rail{position:static;width:100%;max-height:none;flex-direction:row;flex-wrap:nowrap;overflow-x:auto;overflow-y:visible;padding:8px 0;gap:6px;border-bottom:1px solid var(--border);margin-bottom:4px}.sec-rail .sr-item{flex-shrink:0;border:1px solid var(--border2);border-radius:20px;padding:4px 12px;font-size:12px;overflow:visible;text-overflow:clip}.sec-rail .sr-item.sr-active{border-color:var(--accent)}}:root[data-theme=light]{--bg:#f6f4ef;--bg2:#fffdf9;--bg3:#efeae1;--bg-hover:#e7e0d4;--border:#e7dfd2;--border2:#d9d0be;--text:#2b2722;--dim2:#57514a;--dim:#7d766b;--faint:#a69d8e;--accent:#3b6fe0;--accent-press:#2f5fd0;--accent-soft:rgba(59,111,224,.10);--accent2:#7c5cf0;--green:#1f9e5f;--amber:#a9760f;--red:#cf4a3f;--teal:#0f8ea0;--shadow-1:0 1px 2px rgba(70,55,35,.05),0 2px 8px rgba(70,55,35,.05);--shadow-2:0 10px 34px rgba(70,55,35,.10);--hairline:inset 0 1px 0 rgba(255,255,255,.55)}:root[data-theme=light] .btn{color:#fff}:root[data-theme=light] .btn.ghost{color:var(--text)}:root[data-theme=light] .codeblock{background:#0f1115;color:#d7dde6}:root[data-theme=light] .siteheader-bar{background:rgba(246,244,239,.8)}:root[data-theme=light] #course-topbar{background:rgba(255,253,249,.85)}.brand{display:inline-flex;align-items:center;gap:8px}.brand-mark{color:var(--accent);flex-shrink:0}.brand-word{font-weight:600;letter-spacing:-.015em;color:var(--text)}.brand-word b{color:var(--accent);font-weight:600}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:14px;gap:14px}@media (max-width:600px){.grid-2{grid-template-columns:1fr}}button.blockhead{width:100%;background:none;border:none;cursor:pointer;color:inherit;font-family:inherit;padding:0}button.blockhead:hover{color:var(--dim2)}.bh-chev{transition:transform .15s ease;opacity:.55;flex-shrink:0}.legal h2{font-size:18px;font-weight:600;margin:26px 0 8px;color:var(--text);letter-spacing:-.01em}.legal li,.legal p{color:var(--dim2);font-size:15px;line-height:1.62}.legal p{margin-bottom:12px}.legal ul{margin:0 0 12px 20px}.legal li{margin-bottom:6px}.legal a{color:var(--accent)}.legal strong{color:var(--text);font-weight:600}.driver-popover.nova-tour{background:var(--bg2);color:var(--text);border:1px solid var(--border2);border-radius:var(--r-lg);box-shadow:var(--shadow-2);max-width:330px}.nova-tour .driver-popover-title{color:var(--text);font-size:16px;font-weight:600}.nova-tour .driver-popover-description{color:var(--dim2);font-size:14px;line-height:1.55}.nova-tour .driver-popover-description b{color:var(--text)}.nova-tour .driver-popover-progress-text{color:var(--faint);font-size:12px}.nova-tour .driver-popover-close-btn{color:var(--dim)}.nova-tour .driver-popover-close-btn:hover{color:var(--text)}.nova-tour .driver-popover-footer button{background:var(--bg3);color:var(--text);border:1px solid var(--border2);border-radius:var(--r-sm);text-shadow:none;font-weight:500}.nova-tour .driver-popover-footer button:hover{background:var(--bg-hover)}.nova-tour .driver-popover-next-btn{background:var(--accent);color:#08080a;border-color:var(--accent);font-weight:600}.nova-tour .driver-popover-next-btn:hover{filter:brightness(1.1)}.driver-popover.nova-tour .driver-popover-arrow-side-left{border-left-color:var(--bg2)}.driver-popover.nova-tour .driver-popover-arrow-side-right{border-right-color:var(--bg2)}.driver-popover.nova-tour .driver-popover-arrow-side-top{border-top-color:var(--bg2)}.driver-popover.nova-tour .driver-popover-arrow-side-bottom{border-bottom-color:var(--bg2)}.modal-backdrop{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.55);display:flex;align-items:center;justify-content:center;padding:20px;animation:fadein .15s ease}.modal{width:100%;max-width:400px;background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r-lg);padding:22px 24px;box-shadow:var(--shadow-2)}.modal h3{color:var(--text);font-size:17px}.price-row{display:flex;align-items:baseline;gap:8px;margin:4px 0 2px}.price-amt{font-size:40px;font-weight:700;letter-spacing:-.03em;color:var(--text)}.price-unit{font-size:14px;color:var(--dim)}.price-note{font-size:13px;color:var(--faint);margin-bottom:6px}