:root{--bg:#0b0b0d;--panel:#101012;--card:#17171b;--line:#232329;--red:#e50914;--text:#ffffff;--muted:#a6a6ad;--dim:#6e6e76;--sidebar-w:248px;--radius:14px;--radius-lg:22px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:Helvetica Neue,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{color:inherit;text-decoration:none}img{max-width:100%}:focus-visible{outline:2px solid #fff;outline-offset:2px}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}.brand{color:var(--red);font-size:1.4rem;font-weight:900;letter-spacing:1.5px;text-transform:uppercase;line-height:1}.avatar{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,var(--red) 0,#7a060d 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input:focus{outline:none;border-color:var(--red)}.section-title{font-size:1.15rem;font-weight:700;margin-bottom:18px;color:#eaeaea}.hero{position:relative;border-radius:var(--radius-lg);overflow:hidden;margin-bottom:44px;background:radial-gradient(120% 160% at 88% -20%,rgba(229,9,20,.38) 0,transparent 55%),radial-gradient(90% 120% at 0 110%,rgba(229,9,20,.14) 0,transparent 50%),linear-gradient(160deg,#1c0d10,#120d0e 45%,#0e0e10);border:1px solid #2a1a1c}.hero-content{max-width:660px;padding:clamp(36px,5vw,64px) clamp(24px,4vw,56px)}.hero-eyebrow{display:inline-block;font-size:.74rem;font-weight:700;letter-spacing:3px;color:var(--red);margin-bottom:16px}.hero h1,.hero-eyebrow{text-transform:uppercase}.hero 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rgba(255,255,255,.18)}.btn-more:hover{background:rgba(255,255,255,.18)}.row{margin-bottom:42px}.row-head{margin-bottom:14px}.row-eyebrow{font-size:.72rem;font-weight:800;letter-spacing:2.5px;color:var(--red);text-transform:uppercase}.row-head h2{font-size:1.28rem;font-weight:800;margin-top:2px;color:#f2f2f2}.row-sub{margin-top:4px;font-size:.84rem;color:var(--dim);max-width:720px}.slider{display:flex;gap:12px;overflow-x:auto;padding:6px 2px 14px;scroll-snap-type:x mandatory;scrollbar-width:none}.slider::-webkit-scrollbar{display:none}.poster{position:relative;flex:0 0 198px;aspect-ratio:2/3;scroll-snap-align:start;border-radius:var(--radius);overflow:hidden;padding:14px;display:flex;flex-direction:column;background:var(--card);border:1px solid rgba(255,255,255,.07);outline:2px solid transparent;outline-offset:3px;transition:outline-color .18s ease,transform .22s 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strong{font-size:1.7rem;font-weight:900;color:var(--red)}.wz-summary span{font-size:.76rem;color:var(--muted)}.wz-hint{font-size:.8rem;color:var(--dim)}.wz-dots{display:flex;gap:7px;margin-top:22px}.wz-dots span{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.18)}.wz-dots span.on{background:var(--red)}.tp-redo{margin-top:8px;background:none;border:none;padding:0;font-family:inherit;font-size:.78rem;font-weight:600;color:var(--muted);text-decoration:underline;cursor:pointer}.tp-redo:hover{color:#fff}.track-panel{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:20px 26px;margin:-18px 0 40px}.tp-head h2{font-size:1.05rem;font-weight:800}.tp-head p{font-size:.82rem;color:var(--dim);margin-top:3px;max-width:460px}.tp-groups{display:flex;gap:28px;flex-wrap:wrap}.chip-group{display:flex;align-items:center;gap:8px}.cg-label{font-size:.7rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--dim);margin-right:4px}.chip{border:1px solid rgba(255,255,255,.22);background:transparent;color:var(--muted);border-radius:999px;padding:8px 18px;font-size:.85rem;font-weight:700;font-family:inherit;cursor:pointer;transition:background-color .18s,color .18s,border-color .18s}.chip:hover{border-color:#fff;color:#fff}.chip.on{background:#ffffff;border-color:#ffffff;color:#0b0b0d}.poster-progress{position:absolute;left:0;right:0;bottom:0;height:4px;background:rgba(255,255,255,.14)}.poster-progress span{display:block;height:100%;background:var(--red)}.course-progress{max-width:420px;margin-bottom:24px}.cp-bar{height:5px;border-radius:3px;background:rgba(255,255,255,.14);overflow:hidden}.cp-bar span{display:block;height:100%;background:var(--red)}.cp-label{display:block;margin-top:7px;font-size:.78rem;font-weight:600;color:var(--muted)}.side-progress{padding:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}.side-progress .sp-row{display:flex;justify-content:space-between;align-items:baseline;font-size:.78rem;color:var(--muted);margin-bottom:8px}.side-progress .sp-row strong{color:#fff;font-size:.95rem}.side-progress .sp-bar{height:5px;border-radius:3px;background:rgba(255,255,255,.12);overflow:hidden}.side-progress .sp-bar span{display:block;height:100%;background:var(--red)}.side-progress .sp-hint{display:block;margin-top:7px;font-size:.7rem;color:var(--dim)}.lesson-complete{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:40px}.btn-complete{border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.08);color:#fff;border-radius:999px;padding:12px 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h1{font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:900;line-height:1.1;letter-spacing:-.3px;text-transform:uppercase;max-width:920px}.lesson-hero .meta-row,.lesson-hero h1{margin-bottom:14px}.lesson-hero .desc{max-width:780px;color:#e2e2e2;line-height:1.55}.lesson-body{max-width:920px;padding-bottom:80px}.lesson-body h2{font-size:1.42rem;font-weight:800;margin:44px 0 14px;padding-top:22px;border-top:1px solid var(--line)}.lesson-body h2:first-child{margin-top:0;border-top:none;padding-top:0}.lesson-body h3{font-size:1.08rem;font-weight:700;margin:28px 0 10px;color:#f5f5f5}.lesson-body p{color:#d2d2d4;line-height:1.7;margin-bottom:14px;font-size:.97rem}.lesson-body ol,.lesson-body ul{margin:0 0 16px 22px;color:#d2d2d4;line-height:1.7;font-size:.97rem}.lesson-body li{margin-bottom:6px}.lesson-body strong{color:#fff}.lesson-body code{background:#232327;border:1px solid #35353b;border-radius:6px;padding:1px 6px;font-family:SF 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.co-title{display:block;font-weight:800;font-size:.78rem;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:6px}.callout-warn{background:rgba(229,9,20,.09);border-color:rgba(229,9,20,.45);color:#f0caca}.callout-warn .co-title{color:#ff6b74}.callout-tip{background:rgba(70,211,105,.07);border-color:rgba(70,211,105,.35);color:#cfe9d6}.callout-tip .co-title{color:#46d369}.callout-info{background:rgba(150,150,160,.12);border-color:rgba(150,150,160,.35);color:#dcdcdc}.callout-info .co-title{color:var(--muted)}.table-wrap{overflow-x:auto;margin:16px 0 22px;border:1px solid var(--line);border-radius:12px}.lesson-body table{width:100%;border-collapse:collapse;font-size:.88rem}.lesson-body th{background:#1a1a1f;color:#fff;text-align:left;padding:10px 14px;font-weight:700;white-space:nowrap}.lesson-body td{padding:10px 14px;border-top:1px solid var(--line);color:#d2d2d4;vertical-align:top}.source-link{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;color:var(--dim);margin-top:4px}.source-link a{color:var(--muted);text-decoration:underline}.source-link a:hover{color:#fff}.lesson-nav{display:flex;justify-content:space-between;gap:14px;margin-top:56px;padding-top:24px;border-top:1px solid var(--line)}.lesson-nav a{flex:1 1;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;transition:background-color .2s,outline-color .18s;outline:2px solid transparent;outline-offset:2px}.lesson-nav a:hover{background:#1e1e23;outline-color:#fff}.lesson-nav .nav-label{display:block;font-size:.72rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--dim);margin-bottom:4px}.lesson-nav .nav-title{font-weight:700;font-size:.95rem}.lesson-nav .next{text-align:right}.footer{padding:34px 0 46px;color:var(--dim);font-size:.8rem;line-height:1.7;border-top:1px solid var(--line);max-width:860px}.footer .brand{font-size:1.2rem;margin-bottom:10px;display:block}@media (max-width:1023px){.sidebar{display:none}.main{margin-left:0;padding-top:0}.mobilebar{display:flex;align-items:center;justify-content:space-between;position:-webkit-sticky;position:sticky;top:0;z-index:60;margin:0 calc(-1 * clamp(20px, 3.2vw, 44px)) 18px;padding:14px clamp(20px,3.2vw,44px);background:rgba(11,11,13,.9);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.mobilebar .brand{font-size:1.5rem}}@media (max-width:640px){.poster{flex-basis:168px}.poster-title{font-size:.9rem}.poster-num{font-size:5.4rem}.hero h1{font-size:1.9rem}.hero-eyebrow{letter-spacing:1.6px;font-size:.7rem}.poster-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.lesson-nav{flex-direction:column}.lesson-nav .next{text-align:left}}