@font-face{font-family:Golos Text;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/golos-text-cyrillic-ext.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Golos Text;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/golos-text-cyrillic.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Golos Text;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/golos-text-latin-ext.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Golos Text;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/golos-text-latin.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--color-background:#cdd5df;--color-surface:#c4ceda;--color-surface-hover:#bac7d6;--color-text:#202b33;--color-text-secondary:#435260;--color-heading:#173b57;--color-border:#aab9ca;--color-accent:#1c5472;--color-accent-hover:#173b57;--color-on-accent:#fff;--color-error:#981f18;--color-success:#1c5957;--color-success-soft:#d3e8e2;--color-accent-soft:#b8cddd;--color-quote:#c4d2df;--font-ui:"Golos Text", system-ui, -apple-system, "Segoe UI", sans-serif;--font-reading:"Golos Text", system-ui, -apple-system, "Segoe UI", sans-serif;--font-code:"Cascadia Code", Consolas, monospace;--content-width:84rem;--reading-width:46rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-6:1.5rem;--space-8:2rem;--space-12:3rem;--space-16:4rem;--radius-control:.5rem;--radius-panel:.75rem;color-scheme:light;font-family:var(--font-ui);background:var(--color-background);color:var(--color-text);accent-color:var(--color-accent)}*{box-sizing:border-box}html{background:var(--color-background);scrollbar-color:var(--color-border) var(--color-background);scrollbar-width:thin}body{background:var(--color-background);min-width:20rem;min-height:100vh;color:var(--color-text);overflow-wrap:break-word;margin:0;font-size:1rem;line-height:1.6}::selection{background:var(--color-accent-soft);color:var(--color-text)}::-webkit-scrollbar{width:.75rem;height:.75rem}::-webkit-scrollbar-track{background:var(--color-background)}::-webkit-scrollbar-thumb{background:var(--color-border);border:.1875rem solid var(--color-background);border-radius:var(--radius-control)}a{color:var(--color-accent);text-decoration-color:color-mix(in srgb, var(--color-accent) 45%, transparent);text-underline-offset:.18em;text-decoration-thickness:.0625em;transition:color .15s ease-out,background-color .15s ease-out,border-color .15s ease-out}a:hover{color:var(--color-accent-hover);text-decoration-color:currentColor}:focus-visible{outline:.1875rem solid var(--color-accent);outline-offset:.1875rem}button,input,textarea,select{font:inherit}img,svg,video{max-width:100%;display:block}.skip-link{z-index:10;top:var(--space-2);left:var(--space-2);padding:var(--space-2) var(--space-3);background:var(--color-heading);color:var(--color-on-accent);border-radius:var(--radius-control);transition:transform .15s ease-out;position:fixed;transform:translateY(-150%)}.skip-link:focus-visible{transform:translateY(0)}.site-header{justify-content:space-between;align-items:center;gap:var(--space-4);width:min(100% - 2 * var(--space-6), var(--content-width));padding:var(--space-4) 0;border-bottom:1px solid var(--color-border);margin:0 auto;display:flex}.brand{align-items:center;gap:var(--space-2);color:var(--color-heading);letter-spacing:-.02em;flex:none;font-size:1.125rem;font-weight:700;text-decoration:none;display:inline-flex}.brand-symbol{object-fit:cover;mix-blend-mode:darken;width:2rem;height:2rem;display:block}.site-header nav{justify-content:flex-end;gap:var(--space-2) var(--space-4);flex-wrap:wrap;align-items:center;display:flex}.site-header nav a:not(.button){min-height:2.75rem;padding:var(--space-1) 0;color:var(--color-text);align-items:center;font-weight:500;text-decoration:none;display:inline-flex}.site-header nav a:not(.button):hover{color:var(--color-accent-hover);text-decoration:underline}.login-help-button,.login-help-dialog__close{color:var(--color-heading);border:1px solid var(--color-border);cursor:pointer;background:0 0;flex:none;justify-content:center;align-items:center;padding:0;display:inline-flex}.login-help-button{border-radius:50%;width:2.25rem;height:2.25rem}.login-help-button:hover,.login-help-dialog__close:hover{background:var(--color-surface-hover);border-color:var(--color-heading)}.login-help-button svg,.login-help-dialog__close svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px}.login-help-dialog{width:min(calc(100% - 2 * var(--space-4)), 32rem);max-height:calc(100dvh - 2 * var(--space-4));background:var(--color-background);color:var(--color-text);border:1px solid var(--color-border);border-radius:var(--radius-panel);margin:auto;padding:0;overflow:auto;box-shadow:0 1rem 3rem #173b572e}.login-help-dialog::backdrop{background:#172b3961}.login-help-dialog__content{padding:var(--space-8);position:relative}.login-help-dialog__content h2{padding-right:var(--space-8)}.login-help-dialog__content>p{margin-top:var(--space-4)}.login-help-dialog__content ol{gap:var(--space-3);margin:var(--space-6) 0 0;padding-left:1.4rem;display:grid}.login-help-dialog__content li{padding-left:var(--space-1)}.login-help-dialog__close{top:var(--space-4);right:var(--space-4);border-radius:var(--radius-control);width:2rem;height:2rem;position:absolute}.login-help-dialog__note{padding-top:var(--space-4);color:var(--color-text-secondary);border-top:1px solid var(--color-border);font-size:.9375rem}.button{min-height:2.75rem;padding:var(--space-2) var(--space-4);background:var(--color-accent);color:var(--color-on-accent);border:1px solid var(--color-accent);border-radius:var(--radius-control);justify-content:center;align-items:center;font-weight:600;text-decoration:none;display:inline-flex}.button:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover);color:var(--color-on-accent);text-decoration:none}.button--outline{min-height:2.25rem;padding:var(--space-1) var(--space-4);border-color:var(--color-border);color:var(--color-text);background:0 0;font-weight:500}.button--outline:hover{border-color:var(--color-heading);color:var(--color-heading);background:0 0}main{width:min(100% - 2 * var(--space-6), var(--content-width));padding:var(--space-12) 0 var(--space-16);margin:0 auto}.public-page main{max-width:var(--reading-width)}.public-page.wide-page main{max-width:var(--content-width);padding-top:0}h1,h2,h3{color:var(--color-heading);letter-spacing:-.02em;text-wrap:balance;margin:0;line-height:1.16}h1{max-width:20ch;font-size:clamp(2rem,5vw,3.25rem);font-weight:700}h2{font-size:clamp(1.375rem,3vw,1.875rem);font-weight:650}h3{font-weight:650}p{margin:0}.eyebrow{margin-bottom:var(--space-3);color:var(--color-text-secondary);font-size:.875rem;font-weight:600}.lead{max-width:65ch;margin-top:var(--space-6);color:var(--color-text-secondary);font-size:clamp(1.125rem,2.5vw,1.375rem)}.actions{gap:var(--space-4);margin-top:var(--space-8);flex-wrap:wrap;align-items:center;display:flex}.public-page section{margin-top:var(--space-12)}.public-page section h2{margin-bottom:var(--space-4)}.public-page section p+p{margin-top:var(--space-4)}.trust{color:var(--color-text);font-weight:600}.course-shell{gap:var(--space-8);grid-template-columns:minmax(12rem,15rem) minmax(0,1fr);grid-template-areas:"side main";align-items:start;display:grid}.course-shell--with-aside{grid-template-areas:"side aside""side main"}.course-sidebar{padding:var(--space-4);background:var(--color-surface);border-radius:var(--radius-panel);grid-area:side}.course-sidebar nav{gap:var(--space-2);display:grid}.course-sidebar a{padding:var(--space-2);color:var(--color-text);border-radius:var(--radius-control);text-decoration:none;display:block}.course-sidebar a[aria-current=page],.course-sidebar a:hover{background:var(--color-surface-hover);color:var(--color-heading)}.course-reading{grid-area:main;min-width:0}.course-aside{grid-area:aside;min-width:0}.course-tree{margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--color-border)}.course-tree-title{padding:0 var(--space-2);color:var(--color-heading);margin:0;font-size:.8125rem;font-weight:700;line-height:1.35}.course-tree ol{gap:var(--space-1);margin:0;padding:0;list-style:none;display:grid}.course-tree a{gap:var(--space-2);grid-template-columns:2.25rem minmax(0,1fr);font-size:.875rem;line-height:1.35;display:grid}.course-tree-number{color:var(--color-text-secondary);font-variant-numeric:tabular-nums;font-weight:600}.course-tree-lecture{flex-wrap:wrap;align-items:baseline;gap:.2rem .45rem;min-width:0;display:flex}.course-tree-lecture-title{min-width:0}.course-tree-status{color:var(--color-success);letter-spacing:.01em;font-size:.6875rem;font-weight:700}.course-tree-progress-error{margin:var(--space-2);color:var(--color-error);font-size:.75rem;line-height:1.35}.course-tree a[data-learning-status=completed] .course-tree-lecture-title{color:var(--color-heading);font-weight:700}.course-tree a[data-publication-status=preparing]{color:var(--color-text-secondary)}.course-tree a[aria-current=page]{background:var(--color-accent-soft);color:var(--color-heading)}.course-tree a[aria-current=page] .course-tree-number{color:var(--color-heading)}@media (width>=80rem){.course-shell--with-aside{grid-template-columns:minmax(12rem,15rem) minmax(0,1fr) minmax(11rem,14rem);grid-template-areas:"side main aside"}.course-shell--with-aside .course-sidebar,.course-aside{top:var(--space-4);max-height:calc(100vh - 2 * var(--space-4));position:sticky;overflow-y:auto}}@media (width<=44rem){.site-header{flex-direction:column;align-items:flex-start}.site-header nav{justify-content:flex-start}.login-help-dialog__content{padding:var(--space-6)}.course-shell,.course-shell--with-aside{grid-template-columns:minmax(0,1fr);grid-template-areas:"side""aside""main"}.course-sidebar{padding:var(--space-3)}.course-sidebar nav{grid-template-columns:repeat(2,minmax(0,1fr))}.course-tree{display:none}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}