.gsurface{color:var(--ink);font-family:var(--font-body);font-size:var(--fs-body);line-height:var(--lh-body);-webkit-font-smoothing:antialiased}.gsurface *,.gsurface *:before,.gsurface *:after{box-sizing:border-box}.gpage{width:min(1320px,100%);margin-inline:auto;padding-block:var(--s-5) var(--s-8)}.gsurface .contour-field{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--contour) .5px,transparent .5px),linear-gradient(90deg,var(--contour) .5px,transparent .5px);background-size:var(--contour-gap) var(--contour-gap);opacity:calc(var(--contour-opacity) * .34);-webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 35%,transparent 78%);mask-image:radial-gradient(120% 90% at 50% 0%,#000 35%,transparent 78%)}.gsurface .kicker{font-family:var(--font-mono);font-size:var(--fs-mono-label);font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}.gsurface .btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;font-family:var(--font-body);font-size:var(--fs-meta);font-weight:500;line-height:1;text-decoration:none;display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:var(--r-md);border:.5px solid transparent;transition:all var(--dur-1) var(--ease)}.gsurface .btn-primary{background:var(--accent);color:var(--on-accent)}.gsurface .btn-primary:hover{background:var(--accent-2)}.gsurface .btn-secondary{background:var(--card);color:var(--ink);border-color:var(--hairline-2)}.gsurface .btn-secondary:hover{border-color:var(--hairline-strong)}.gsurface .btn-ghost{background:transparent;color:var(--ink-2)}.gsurface .btn-ghost:hover{background:var(--card);color:var(--ink)}.gsurface .btn-sm{padding:7px 12px;font-size:var(--fs-small)}.gsurface .btn:disabled{opacity:.5;cursor:not-allowed}.gsurface .btn .arrow{transition:transform var(--dur-1) var(--ease)}.gsurface .btn:hover .arrow{transform:translate(2px)}.gsurface .domain-tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;padding:3px 9px 3px 7px;border-radius:var(--r-sm);color:var(--d);background:color-mix(in srgb,var(--d) 13%,var(--card));border:.5px solid color-mix(in srgb,var(--d) 38%,transparent)}.gsurface .domain-tag .sq{width:8px;height:8px;border-radius:1px;background:var(--d)}.gsurface .callout{border:.5px solid var(--hairline-2);border-left:2px solid var(--muted);border-radius:var(--r-md);padding:var(--s-4);background:var(--card-2);display:flex;flex-direction:column;gap:var(--s-1)}.gsurface .callout .co-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.gsurface .callout p{font-size:var(--fs-meta);color:var(--ink-2)}.gsurface .callout.misconception{border-left-color:var(--danger);background:color-mix(in srgb,var(--danger) 6%,var(--card))}.gsurface .callout.misconception .co-label{color:var(--danger)}.gsurface .gcrumb{display:flex;align-items:center;gap:var(--s-2);font-family:var(--font-mono);font-size:var(--fs-mono-label);letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}.gsurface .gcrumb a{color:var(--muted)}.gsurface .gcrumb .sep{color:var(--hairline-strong)}.gsurface .atlas-masthead{position:relative;margin-bottom:var(--s-6)}.gsurface .atlas-masthead .contour-field{opacity:calc(var(--contour-opacity) * .22)}.gsurface .atlas-title{font-family:var(--font-display);font-size:var(--fs-h1);font-weight:460;line-height:1;letter-spacing:-.02em;margin-block:var(--s-3);position:relative;z-index:2}.gsurface .atlas-title em{font-style:italic;font-weight:380;color:var(--ink-2)}.gsurface .atlas-lede{font-size:var(--fs-h5);color:var(--ink-2);max-width:62ch;line-height:1.45;position:relative;z-index:2}.gsurface .atlas-stats{display:flex;gap:var(--s-5);margin-top:var(--s-4);position:relative;z-index:2;flex-wrap:wrap}.gsurface .atlas-stats .as{display:flex;align-items:baseline;gap:7px}.gsurface .atlas-stats .as b{font-family:var(--font-display);font-size:var(--fs-h4);font-weight:520;font-variant-numeric:tabular-nums}.gsurface .atlas-stats .as span{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.gsurface .atlas-controls{display:flex;align-items:center;gap:var(--s-4);flex-wrap:wrap;padding:var(--s-3) 0;margin-bottom:var(--s-5);border-block:.5px solid var(--hairline)}.gsurface .atlas-search{display:flex;align-items:center;gap:var(--s-2);flex:1;min-width:220px;max-width:360px;padding:8px 13px;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card);color:var(--muted)}.gsurface .atlas-search svg{width:15px;height:15px;flex-shrink:0}.gsurface .atlas-search input{flex:1;border:0;background:transparent;font-family:var(--font-body);font-size:var(--fs-meta);color:var(--ink);outline:none;min-width:0}.gsurface .ctrl-group{display:flex;align-items:center;gap:var(--s-2);flex-wrap:wrap}.gsurface .ctrl-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}.gsurface .band-filter{display:inline-flex;gap:3px;padding:2px;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card)}.gsurface .band-pill{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:transparent;cursor:pointer;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.04em;color:var(--muted);padding:5px 9px;border-radius:var(--r-sm);transition:background var(--dur-1) var(--ease),color var(--dur-1) var(--ease)}.gsurface .band-pill[aria-pressed=true]{background:var(--paper-2);color:var(--ink);box-shadow:var(--shadow-1)}.gsurface .band-pill.locked-band{color:var(--faint)}.gsurface .fam-filter{display:flex;gap:6px;flex-wrap:wrap}.gsurface .fam-chip{display:inline-flex;align-items:center;gap:6px;cursor:pointer;white-space:nowrap;font-family:var(--font-mono);font-size:11px;letter-spacing:.03em;padding:4px 9px 4px 7px;border-radius:var(--r-sm);color:var(--muted);background:var(--card);border:.5px solid var(--hairline-2);transition:all var(--dur-1) var(--ease)}.gsurface .fam-chip .sq{width:8px;height:8px;border-radius:1px;background:var(--fam, var(--muted))}.gsurface .fam-chip[aria-pressed=true]{color:var(--fam);border-color:color-mix(in srgb,var(--fam) 45%,transparent);background:color-mix(in srgb,var(--fam) 12%,var(--card))}.gsurface .fam-chip:hover{border-color:var(--hairline-strong)}.gsurface .atlas-spread{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--s-5);align-items:start}@media(max-width:1024px){.gsurface .atlas-spread{grid-template-columns:repeat(2,1fr)}}@media(max-width:680px){.gsurface .atlas-spread{grid-template-columns:1fr}}.gsurface .fam-region{--fam: var(--muted);position:relative;border:.5px solid var(--hairline-2);border-top:2px solid var(--fam);border-radius:var(--r-md);background:linear-gradient(180deg,color-mix(in srgb,var(--fam) 7%,var(--card)) 0%,var(--card) 64px);padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .fam-region-head{display:flex;align-items:baseline;justify-content:space-between;gap:var(--s-2);padding-bottom:var(--s-2);border-bottom:.5px solid var(--hairline)}.gsurface .fam-region-head .fr-name{font-family:var(--font-display);font-size:var(--fs-h5);font-weight:500;letter-spacing:-.01em;color:var(--ink)}.gsurface .fam-region-head .fr-tag{display:inline-flex;align-items:center;gap:5px;font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--fam)}.gsurface .fam-region-head .fr-tag .sq{width:7px;height:7px;border-radius:1px;background:var(--fam)}.gsurface .fam-region .fr-count{font-family:var(--font-mono);font-size:10.5px;color:var(--faint);letter-spacing:.04em}.gsurface .topic-entry{display:grid;grid-template-columns:1fr auto;grid-template-areas:"title mastery" "meta meta";gap:3px var(--s-3);padding:9px 10px;border-radius:var(--r-sm);border:.5px solid transparent;cursor:pointer;text-decoration:none;transition:background var(--dur-1) var(--ease),border-color var(--dur-1) var(--ease)}.gsurface .topic-entry:hover{background:color-mix(in srgb,var(--fam) 9%,var(--card));border-color:color-mix(in srgb,var(--fam) 30%,transparent)}.gsurface .topic-entry .te-title{grid-area:title;font-size:var(--fs-meta);font-weight:500;color:var(--ink);line-height:1.25;text-wrap:pretty}.gsurface .topic-entry .te-meta{grid-area:meta;display:flex;align-items:center;gap:6px;flex-wrap:wrap}.gsurface .topic-entry .te-mastery{grid-area:mastery;align-self:start}.gsurface .cefr-badge{font-family:var(--font-mono);font-size:9.5px;font-weight:500;letter-spacing:.05em;padding:1px 5px;border-radius:var(--r-sm);border:.5px solid color-mix(in srgb,var(--fam) 40%,var(--hairline-2));color:var(--fam);background:color-mix(in srgb,var(--fam) 8%,transparent)}.gsurface .cefr-range{font-family:var(--font-mono);font-size:10px;color:var(--faint);letter-spacing:.04em}.gsurface .mastery{width:22px;height:22px;position:relative;display:grid;place-items:center;flex-shrink:0}.gsurface .mastery svg{transform:rotate(-90deg)}.gsurface .mastery .m-track{stroke:color-mix(in srgb,var(--ink) 12%,transparent)}.gsurface .mastery .m-val{stroke:var(--fam);stroke-linecap:round}.gsurface .mastery.is-new:after{content:"";position:absolute;width:4px;height:4px;border-radius:50%;border:1px solid var(--faint)}.gsurface .mastery.is-mature:after{content:"";position:absolute;width:5px;height:5px;border-radius:50%;background:var(--fam)}.gsurface .mastery-track{display:inline-flex;gap:3px;align-items:center}.gsurface .mastery-track i{width:5px;height:5px;border-radius:50%;background:color-mix(in srgb,var(--ink) 14%,transparent)}.gsurface .mastery-track i.on{background:var(--fam)}.gsurface .topic-entry.locked{cursor:not-allowed;opacity:.62}.gsurface .topic-entry.locked .te-title{color:var(--muted)}.gsurface .topic-entry.locked:hover{background:color-mix(in srgb,var(--ink) 4%,transparent);border-color:var(--hairline-2)}.gsurface .lock-glyph{display:inline-flex;align-items:center;color:var(--faint)}.gsurface .lock-glyph svg{width:12px;height:12px}.gsurface .lock-hint{font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;color:var(--faint);display:none}.gsurface .topic-entry.locked:hover .lock-hint{display:inline;color:var(--warn)}.gsurface .topic-entry.locked:hover .te-meta .cefr-range{display:none}.gsurface .atlas-empty{display:flex;flex-direction:column;align-items:center;gap:var(--s-3);padding:var(--s-9) var(--s-5);text-align:center;border:.5px dashed var(--hairline-strong);border-radius:var(--r-lg);color:var(--muted)}.gsurface .atlas-empty .ae-glyph{width:52px;height:52px;color:var(--faint);opacity:.7}.gsurface .atlas-empty h3{font-family:var(--font-display);font-size:var(--fs-h4);font-weight:460;color:var(--ink-2)}.gsurface .atlas-empty p{max-width:42ch;font-size:var(--fs-meta)}.gsurface .topic-page{width:min(1100px,100%);margin-inline:auto;padding-block:var(--s-5) var(--s-8)}.gsurface .topic-head{display:flex;flex-direction:column;gap:var(--s-3);margin-bottom:var(--s-5)}.gsurface .topic-head .th-top{display:flex;align-items:center;gap:var(--s-3);flex-wrap:wrap}.gsurface .topic-title{font-family:var(--font-display);font-size:var(--fs-h1);font-weight:460;line-height:1.02;letter-spacing:-.02em}.gsurface .topic-title .tt-sub{display:block;font-size:var(--fs-h4);font-style:italic;font-weight:380;color:var(--ink-2);margin-top:4px}.gsurface .level-seg{display:inline-flex;padding:3px;gap:2px;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card)}.gsurface .level-seg button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:transparent;cursor:pointer;font-family:var(--font-mono);font-size:11.5px;font-weight:500;letter-spacing:.05em;color:var(--muted);padding:5px 11px;border-radius:var(--r-sm);transition:all var(--dur-1) var(--ease)}.gsurface .level-seg button[aria-pressed=true]{background:var(--paper-2);color:var(--ink);box-shadow:var(--shadow-1)}.gsurface .level-seg button.locked{color:var(--faint);cursor:not-allowed}.gsurface .level-seg button.locked svg{width:10px;height:10px;margin-left:4px;vertical-align:-1px}.gsurface .topic-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:var(--s-6);align-items:start}@media(max-width:900px){.gsurface .topic-grid{grid-template-columns:1fr}}.gsurface .plate{position:relative;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card);overflow:hidden}.gsurface .plate-frame{position:relative;width:100%;aspect-ratio:800 / 450;background:var(--card-2);display:grid;place-items:center}.gsurface .plate-frame .contour-field{opacity:calc(var(--contour-opacity) * .2)}.gsurface .plate-caption{display:flex;align-items:baseline;justify-content:space-between;gap:var(--s-3);padding:10px 14px;border-top:.5px solid var(--hairline)}.gsurface .plate-caption .pc-fig{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}.gsurface .plate-caption .pc-text{font-size:var(--fs-small);color:var(--muted);font-style:italic;text-align:right}.gsurface .plate .rm-note{position:absolute;top:10px;right:10px;display:inline-flex;align-items:center;gap:5px;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);background:color-mix(in srgb,var(--paper) 80%,transparent);border:.5px solid var(--hairline-2);border-radius:var(--r-sm);padding:3px 7px;z-index:3}.gsurface .teach{display:flex;flex-direction:column;gap:var(--s-4)}.gsurface .teach-block{display:flex;flex-direction:column;gap:var(--s-2)}.gsurface .teach .prose-primary{font-size:var(--fs-h5);line-height:1.6;color:var(--ink)}.gsurface .teach .prose-label{display:inline-flex;align-items:center;gap:7px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.gsurface .teach .prose-label .pl-gold{color:var(--accent)}.gsurface .teach .prose-secondary{font-size:var(--fs-meta);line-height:1.55;color:var(--ink-2);padding-left:var(--s-4);border-left:2px solid var(--hairline-2)}.gsurface .teach .prose-secondary .ps-tag{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);display:block;margin-bottom:4px}.gsurface .teach .prose-primary>:first-child,.gsurface .teach .prose-secondary>:first-child{margin-top:0}.gsurface .teach .prose-primary>:last-child,.gsurface .teach .prose-secondary>:last-child{margin-bottom:0}.gsurface .teach .prose-primary p,.gsurface .teach .prose-secondary p{margin:0 0 var(--s-3)}.gsurface .teach .prose-primary strong{font-weight:650;color:var(--ink)}.gsurface .teach .prose-primary code,.gsurface .teach .prose-secondary code{font-family:var(--font-mono);font-size:.86em;background:var(--card-2);border:.5px solid var(--hairline-2);border-radius:var(--r-sm);padding:.05em .4em;color:var(--ink)}.gsurface .teach .prose-primary ul,.gsurface .teach .prose-primary ol{margin:0 0 var(--s-3);padding-left:var(--s-5);display:flex;flex-direction:column;gap:4px}.gsurface .teach .prose-primary li{line-height:1.5}.gsurface .teach .prose-primary blockquote{margin:0 0 var(--s-3);padding-left:var(--s-4);border-left:2px solid var(--accent);color:var(--ink-2);font-style:italic}.gsurface .teach .prose-primary table{width:100%;border-collapse:collapse;margin:0 0 var(--s-3);font-size:var(--fs-meta)}.gsurface .teach .prose-primary th,.gsurface .teach .prose-primary td{border:.5px solid var(--hairline-2);padding:6px 10px;text-align:left;vertical-align:top}.gsurface .teach .prose-primary th{background:var(--card-2);font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);font-weight:500}.gsurface .rule-named{border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card-2);padding:var(--s-4)}.gsurface .rule-named .rn-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:var(--s-2)}.gsurface .rule-named .rn-formula{font-family:var(--font-mono);font-size:var(--fs-h5);color:var(--ink);line-height:1.5}.gsurface .examples{display:flex;flex-direction:column;gap:var(--s-2)}.gsurface .example{padding:var(--s-3) var(--s-4);border:.5px solid var(--hairline);border-radius:var(--r-md);background:var(--card);display:flex;flex-direction:column;gap:3px}.gsurface .example .ex-en{font-size:var(--fs-meta);color:var(--ink)}.gsurface .example .ex-en b{color:var(--accent);font-weight:600}.gsurface .example .ex-ru{font-size:var(--fs-small);color:var(--muted);font-style:italic}.gsurface .rn-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.gsurface .pitfall{border:.5px solid color-mix(in srgb,var(--danger) 30%,var(--hairline-2));border-left:2px solid var(--danger);border-radius:var(--r-md);background:color-mix(in srgb,var(--danger) 5%,var(--card));padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .pitfall .pf-label{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--danger)}.gsurface .pitfall .pf-label svg{width:13px;height:13px}.gsurface .pf-row{display:grid;grid-template-columns:18px 1fr;gap:var(--s-2) var(--s-3);align-items:start}.gsurface .pf-row .pf-mark{display:grid;place-items:center;width:18px;height:18px;border-radius:50%;margin-top:1px}.gsurface .pf-row .pf-mark svg{width:11px;height:11px}.gsurface .pf-row.wrong .pf-mark{background:color-mix(in srgb,var(--danger) 14%,transparent);color:var(--danger)}.gsurface .pf-row.right .pf-mark{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}.gsurface .pf-row .pf-text{font-size:var(--fs-meta)}.gsurface .pf-row.wrong .pf-text{color:var(--muted);text-decoration:line-through;text-decoration-color:color-mix(in srgb,var(--danger) 50%,transparent)}.gsurface .pf-row.right .pf-text{color:var(--ink)}.gsurface .pitfall .pf-why{font-size:var(--fs-small);color:var(--ink-2);padding-top:var(--s-2);border-top:.5px solid var(--hairline)}.gsurface .pitfall .pf-why b{color:var(--ink)}.gsurface .confusables{border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card);padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .confusables .cf-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.gsurface .cf-links{display:flex;flex-direction:column;gap:6px}.gsurface .cf-link{display:flex;align-items:center;gap:var(--s-2);padding:7px 9px;border-radius:var(--r-sm);border:.5px solid var(--hairline);cursor:pointer;text-decoration:none;transition:all var(--dur-1) var(--ease)}.gsurface .cf-link:hover{border-color:color-mix(in srgb,var(--fam) 40%,transparent);background:color-mix(in srgb,var(--fam) 8%,var(--card))}.gsurface .cf-link .sq{width:8px;height:8px;border-radius:1px;background:var(--fam, var(--muted));flex-shrink:0}.gsurface .cf-link .cf-name{font-size:var(--fs-small);color:var(--ink);flex:1}.gsurface .cf-link .cf-arrow{color:var(--faint)}.gsurface .cf-contrast{font-size:var(--fs-small);color:var(--muted);padding-top:var(--s-2);border-top:.5px solid var(--hairline);line-height:1.5}.gsurface .cf-contrast b{color:var(--ink-2)}.gsurface .topic-rail{display:flex;flex-direction:column;gap:var(--s-4);position:sticky;top:var(--s-4)}@media(max-width:900px){.gsurface .topic-rail{position:static}}.gsurface .practice-cta{border:.5px solid color-mix(in srgb,var(--accent) 30%,var(--hairline-2));border-radius:var(--r-md);background:color-mix(in srgb,var(--accent) 6%,var(--card));padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .practice-cta .pca-num{font-family:var(--font-display);font-size:var(--fs-h3);font-weight:520}.gsurface .practice-cta .pca-line{font-size:var(--fs-small);color:var(--ink-2)}.gsurface .topic-mastery-card{border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card);padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .tmc-head{display:flex;align-items:center;justify-content:space-between}.gsurface .tmc-head .tmc-label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.gsurface .tmc-strength{display:flex;align-items:center;gap:var(--s-3)}.gsurface .tmc-strength .tmc-ring{width:44px;height:44px;flex-shrink:0}.gsurface .tmc-meta{display:flex;flex-direction:column;gap:2px}.gsurface .tmc-meta .tmc-state{font-size:var(--fs-meta);color:var(--ink);font-weight:500}.gsurface .tmc-meta .tmc-due{font-family:var(--font-mono);font-size:11px;color:var(--faint)}.gsurface .practice{width:min(680px,100%);margin-inline:auto;padding-block:var(--s-5) var(--s-7);display:flex;flex-direction:column;gap:var(--s-5)}.gsurface .practice-bar{display:flex;align-items:center;gap:var(--s-3);flex-wrap:wrap}.gsurface .practice-bar .pb-topic{display:flex;align-items:center;gap:var(--s-2);font-size:var(--fs-meta);color:var(--ink)}.gsurface .practice-bar .pb-topic .sq{width:9px;height:9px;border-radius:1px;background:var(--fam)}.gsurface .practice-bar .pb-spacer{flex:1}.gsurface .session-track{display:flex;align-items:center;gap:4px}.gsurface .session-track i{width:18px;height:4px;border-radius:var(--r-pill);background:color-mix(in srgb,var(--ink) 13%,transparent)}.gsurface .session-track i.done{background:var(--ok)}.gsurface .session-track i.wrong{background:color-mix(in srgb,var(--danger) 60%,var(--ink))}.gsurface .session-track i.cur{background:var(--accent)}.gsurface .session-count{font-family:var(--font-mono);font-size:11px;color:var(--muted)}.gsurface .cross-toggle{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted);padding:5px 10px;border:.5px solid var(--hairline-2);border-radius:var(--r-pill);background:var(--card);transition:all var(--dur-1) var(--ease)}.gsurface .cross-toggle .tog{width:26px;height:15px;border-radius:var(--r-pill);background:color-mix(in srgb,var(--ink) 16%,transparent);position:relative;transition:background var(--dur-1) var(--ease);flex-shrink:0}.gsurface .cross-toggle .tog:after{content:"";position:absolute;top:2px;left:2px;width:11px;height:11px;border-radius:50%;background:var(--card);box-shadow:var(--shadow-1);transition:transform var(--dur-2) var(--ease)}.gsurface .cross-toggle[aria-pressed=true]{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 40%,transparent);background:color-mix(in srgb,var(--accent) 8%,var(--card))}.gsurface .cross-toggle[aria-pressed=true] .tog{background:var(--accent)}.gsurface .cross-toggle[aria-pressed=true] .tog:after{transform:translate(11px)}.gsurface .item-card{border:.5px solid var(--hairline-2);border-radius:var(--r-lg);background:var(--card);padding:var(--s-6) var(--s-5);display:flex;flex-direction:column;gap:var(--s-5);box-shadow:var(--shadow-1);position:relative}.gsurface .item-kind{display:flex;align-items:center;justify-content:space-between;gap:var(--s-3)}.gsurface .item-kind .ik-tag{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:inline-flex;align-items:center;gap:7px}.gsurface .item-kind .ik-tag .sq{width:8px;height:8px;border-radius:1px;background:var(--d-backend)}.gsurface .item-kind .ik-cross{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);border:.5px solid color-mix(in srgb,var(--accent) 35%,transparent);border-radius:var(--r-sm);padding:2px 6px}.gsurface .item-prompt{font-family:var(--font-display);font-size:var(--fs-h4);font-weight:460;line-height:1.4;color:var(--ink)}.gsurface .item-prompt .blank{display:inline-block;min-width:84px;border-bottom:2px solid var(--accent);margin:0 4px;text-align:center}.gsurface .item-prompt .blank.filled{color:var(--accent)}.gsurface .item-gloss{font-size:var(--fs-small);color:var(--muted);font-style:italic;margin-top:-8px}.gsurface .cloze-input{display:flex;gap:var(--s-3);align-items:center;flex-wrap:wrap}.gsurface .cloze-input input{flex:1;min-width:200px;padding:12px 15px;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--paper);font-family:var(--font-body);font-size:var(--fs-h5);color:var(--ink);outline:none;transition:border-color var(--dur-1) var(--ease)}.gsurface .cloze-input input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-ghost)}.gsurface .mc-options{display:flex;flex-direction:column;gap:var(--s-2)}.gsurface .mc-opt{display:flex;align-items:center;gap:var(--s-3);padding:13px 16px;border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card);cursor:pointer;transition:all var(--dur-1) var(--ease);font-size:var(--fs-h5);color:var(--ink);text-align:left;width:100%}.gsurface .mc-opt:hover{border-color:var(--hairline-strong);background:var(--card-2)}.gsurface .mc-opt .key{font-family:var(--font-mono);font-size:12px;width:24px;height:24px;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;border:.5px solid var(--hairline-2);border-radius:var(--r-sm);color:var(--muted)}.gsurface .mc-opt.selected{border-color:var(--accent);background:var(--accent-ghost)}.gsurface .mc-opt.selected .key{background:var(--accent);color:var(--on-accent);border-color:transparent}.gsurface .mc-opt.correct{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,var(--card))}.gsurface .mc-opt.correct .key{background:var(--ok);color:var(--paper);border-color:transparent}.gsurface .mc-opt.incorrect{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 9%,var(--card))}.gsurface .mc-opt.incorrect .key{background:var(--danger);color:var(--paper);border-color:transparent}.gsurface .mc-opt .mc-mark{margin-left:auto;display:inline-flex}.gsurface .mc-opt .mc-mark svg{width:16px;height:16px}.gsurface .item-actions{display:flex;align-items:center;gap:var(--s-3)}.gsurface .item-actions .ia-spacer{flex:1}.gsurface .feedback{border-radius:var(--r-md);padding:var(--s-4);display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .feedback.correct{background:color-mix(in srgb,var(--ok) 8%,var(--card));border:.5px solid color-mix(in srgb,var(--ok) 32%,transparent)}.gsurface .feedback.incorrect{background:color-mix(in srgb,var(--warn) 8%,var(--card));border:.5px solid color-mix(in srgb,var(--warn) 32%,transparent)}.gsurface .fb-head{display:flex;align-items:center;gap:var(--s-2)}.gsurface .fb-head .fb-icon{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;flex-shrink:0}.gsurface .fb-head .fb-icon svg{width:13px;height:13px}.gsurface .feedback.correct .fb-icon{background:var(--ok);color:var(--paper)}.gsurface .feedback.incorrect .fb-icon{background:var(--warn);color:var(--paper)}.gsurface .fb-head .fb-title{font-family:var(--font-display);font-size:var(--fs-h5);font-weight:500}.gsurface .feedback.correct .fb-title{color:color-mix(in srgb,var(--ok) 70%,var(--ink))}.gsurface .feedback.incorrect .fb-title{color:color-mix(in srgb,var(--warn) 60%,var(--ink))}.gsurface .fb-answer{font-size:var(--fs-meta);color:var(--ink)}.gsurface .fb-answer .ans{font-weight:600;color:var(--ink);border-bottom:1.5px solid var(--ok)}.gsurface .fb-rationale{font-size:var(--fs-small);line-height:1.55;color:var(--ink-2);display:flex;flex-direction:column;gap:4px;padding-top:var(--s-2);border-top:.5px solid var(--hairline)}.gsurface .fb-rationale .fr-ru{color:var(--ink)}.gsurface .fb-rationale .fr-en{color:var(--muted);font-style:italic}.gsurface .fb-strength{display:inline-flex;align-items:center;gap:7px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:var(--ok);margin-left:auto}.gsurface .fb-strength svg{width:12px;height:12px}.gsurface .gen-state{display:flex;flex-direction:column;align-items:center;gap:var(--s-4);padding:var(--s-9) var(--s-5);text-align:center}.gsurface .gen-spinner{width:34px;height:34px;border-radius:50%;border:2.5px solid var(--hairline-2);border-top-color:var(--accent);animation:g-spin .8s linear infinite}@keyframes g-spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.gsurface .gen-spinner{animation:none;border-top-color:var(--hairline-2)}}.gsurface .gen-state .gen-label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.gsurface .gen-state .gen-sub{font-size:var(--fs-small);color:var(--faint)}.gsurface .session-done{border:.5px solid var(--hairline-2);border-radius:var(--r-lg);background:var(--card);padding:var(--s-7) var(--s-5);display:flex;flex-direction:column;align-items:center;gap:var(--s-4);text-align:center;box-shadow:var(--shadow-1)}.gsurface .session-done .sd-ring{width:92px;height:92px;position:relative;display:grid;place-items:center}.gsurface .session-done .sd-ring svg{transform:rotate(-90deg)}.gsurface .session-done .sd-num{position:absolute;font-family:var(--font-display);font-size:var(--fs-h3);font-weight:540}.gsurface .session-done h3{font-family:var(--font-display);font-size:var(--fs-h3);font-weight:460}.gsurface .session-done .sd-line{font-size:var(--fs-meta);color:var(--ink-2);max-width:44ch}.gsurface .sd-stats{display:flex;gap:var(--s-5);margin-block:var(--s-2)}.gsurface .sd-stats .sd-stat{display:flex;flex-direction:column;gap:2px}.gsurface .sd-stats .sd-stat b{font-family:var(--font-display);font-size:var(--fs-h4);font-weight:520;font-variant-numeric:tabular-nums}.gsurface .sd-stats .sd-stat span{font-family:var(--font-mono);font-size:10px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}.gsurface .sd-actions{display:flex;gap:var(--s-2);flex-wrap:wrap;justify-content:center}.gsurface .byok-more{border:.5px dashed color-mix(in srgb,var(--accent) 40%,var(--hairline-strong));border-radius:var(--r-md);background:color-mix(in srgb,var(--accent) 4%,transparent);padding:var(--s-3) var(--s-4);display:flex;align-items:center;gap:var(--s-3)}.gsurface .byok-more .bm-key{width:26px;height:26px;border-radius:var(--r-sm);display:grid;place-items:center;background:var(--accent-ghost);color:var(--accent);flex-shrink:0}.gsurface .byok-more .bm-key svg{width:14px;height:14px}.gsurface .byok-more .bm-text{flex:1;display:flex;flex-direction:column;gap:1px}.gsurface .byok-more .bm-title{font-size:var(--fs-small);color:var(--ink);font-weight:500}.gsurface .byok-more .bm-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;color:var(--muted)}.gsurface .byok-more .bm-exp{font-family:var(--font-mono);font-size:9px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);border:.5px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:var(--r-sm);padding:2px 6px}.gsurface .coverage-page{width:min(1100px,100%);margin-inline:auto;padding-block:var(--s-5) var(--s-8)}.gsurface .cov-head{margin-bottom:var(--s-6)}.gsurface .cov-head .atlas-title{font-size:var(--fs-h2);margin-block:var(--s-2)}.gsurface .cov-head .atlas-lede{font-size:var(--fs-meta)}.gsurface .cov-summary{display:grid;grid-template-columns:auto 1fr;gap:var(--s-6);align-items:center;padding:var(--s-5);border:.5px solid var(--hairline-2);border-radius:var(--r-lg);background:var(--card);margin-bottom:var(--s-6);position:relative;overflow:hidden}@media(max-width:720px){.gsurface .cov-summary{grid-template-columns:1fr}}.gsurface .cov-summary .contour-field{opacity:calc(var(--contour-opacity) * .16)}.gsurface .cov-gauge{width:200px;position:relative;z-index:2;margin-inline:auto}.gsurface .cov-gauge .cg-readout{text-align:center;margin-top:-34px}.gsurface .cov-gauge .cg-num{font-family:var(--font-display);font-size:var(--fs-h1);font-weight:500;font-variant-numeric:tabular-nums}.gsurface .cov-gauge .cg-num sup{font-size:.4em;color:var(--muted)}.gsurface .cov-gauge .cg-lbl{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.gsurface .cov-legend{display:flex;flex-direction:column;gap:var(--s-3);position:relative;z-index:2}.gsurface .cov-legend .cl-row{display:flex;align-items:center;gap:var(--s-3)}.gsurface .cov-legend .cl-row .k{width:12px;height:12px;border-radius:2px;flex-shrink:0}.gsurface .cov-legend .cl-row .cl-text{font-size:var(--fs-meta);color:var(--ink-2)}.gsurface .cov-legend .cl-row .cl-text b{color:var(--ink)}.gsurface .cov-legend .cite{font-size:var(--fs-small);color:var(--faint);font-style:italic}.gsurface .cov-bands{display:flex;flex-direction:column;gap:var(--s-3)}.gsurface .cov-band{display:grid;grid-template-columns:56px 1fr auto;gap:var(--s-4);align-items:center;padding:var(--s-3) var(--s-4);border:.5px solid var(--hairline);border-radius:var(--r-md);background:var(--card);cursor:pointer;transition:all var(--dur-1) var(--ease);width:100%;text-align:left}.gsurface .cov-band:hover{border-color:var(--hairline-strong);background:var(--card-2)}.gsurface .cov-band .cb-label{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--ink);padding:3px 0;text-align:center;border:.5px solid var(--hairline-2);border-radius:var(--r-sm)}.gsurface .cov-band.locked{opacity:.6;cursor:default}.gsurface .cov-band.locked .cb-label{color:var(--faint)}.gsurface .cb-meter{display:flex;flex-direction:column;gap:5px}.gsurface .cb-meter .cbm-bar{height:9px;border-radius:var(--r-pill);background:color-mix(in srgb,var(--ink) 9%,transparent);overflow:hidden;display:flex}.gsurface .cb-meter .cbm-bar .seg-cov{background:var(--ok);height:100%}.gsurface .cb-meter .cbm-bar .seg-part{background:var(--accent);height:100%}.gsurface .cb-meter .cbm-bar .seg-waive{background:color-mix(in srgb,var(--ink) 16%,transparent);height:100%}.gsurface .cb-meter .cbm-meta{display:flex;gap:var(--s-3);font-family:var(--font-mono);font-size:10px;color:var(--muted);letter-spacing:.03em;flex-wrap:wrap}.gsurface .cov-band .cb-pct{font-family:var(--font-display);font-size:var(--fs-h5);font-weight:520;font-variant-numeric:tabular-nums;min-width:56px;text-align:right}.gsurface .cov-band .cb-drill{color:var(--faint)}.gsurface .cov-drill{margin-top:var(--s-3);border:.5px solid var(--hairline-2);border-radius:var(--r-md);background:var(--card-2);padding:var(--s-4)}.gsurface .cov-drill .cd-head{display:flex;align-items:baseline;gap:var(--s-3);margin-bottom:var(--s-3);flex-wrap:wrap}.gsurface .cov-drill .cd-head .cd-title{font-family:var(--font-display);font-size:var(--fs-h5);font-weight:500}.gsurface .cov-drill .cd-head .cd-egp{font-family:var(--font-mono);font-size:10.5px;color:var(--faint)}.gsurface .cd-topics{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}@media(max-width:640px){.gsurface .cd-topics{grid-template-columns:1fr}}.gsurface .cd-topic{display:flex;align-items:center;gap:var(--s-2);padding:7px 10px;border-radius:var(--r-sm);border:.5px solid var(--hairline);background:var(--card);cursor:pointer;text-decoration:none;transition:all var(--dur-1) var(--ease)}.gsurface .cd-topic:hover{border-color:color-mix(in srgb,var(--fam) 40%,transparent)}.gsurface .cd-topic .sq{width:8px;height:8px;border-radius:1px;background:var(--fam);flex-shrink:0}.gsurface .cd-topic .cd-name{font-size:var(--fs-small);color:var(--ink);flex:1}.gsurface .cd-topic .cd-egpid{font-family:var(--font-mono);font-size:9.5px;color:var(--faint)}.gsurface .g-toolbar{display:flex;align-items:center;gap:var(--s-3);flex-wrap:wrap;margin-bottom:var(--s-4)}.gsurface .g-toolbar a{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted)}.gsurface .g-toolbar a:hover{color:var(--ink)}.gplan{display:flex;flex-direction:column;gap:1.25rem;max-width:640px;margin:0 auto}.gplan-fc{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;border:1px solid var(--rule);border-radius:2px}.gplan-fc.over{border-color:var(--d-frontend)}.gplan-fc-verdict{font-weight:600}.gplan-fc-count{color:var(--muted);font-size:13px}.gplan-fc .btn{margin-left:auto}.gplan-today h2,.gplan-full h2{font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin:0 0 .5rem}.gplan-band-head{font-family:var(--font-mono, monospace);font-size:11px;color:var(--muted);margin:.75rem 0 .25rem}.gplan-row{display:flex;align-items:baseline;gap:.5rem;padding:.6rem .8rem;border:1px solid var(--rule);border-radius:2px;margin-bottom:.35rem;text-decoration:none;color:var(--ink)}.gplan-row:hover{border-color:var(--rule-strong)}.gplan-row.locked{opacity:.45;cursor:not-allowed}.gplan-row-meta{margin-left:auto;font-size:12px;color:var(--muted);font-family:var(--font-mono, monospace)}.gplan-goalset{display:flex;flex-direction:column;gap:.75rem;max-width:420px;margin:2rem auto}.gplan-goalset label{display:flex;flex-direction:column;gap:.25rem;font-size:13px;color:var(--muted)}.ghome-tabs{display:flex;gap:.4rem;justify-content:center;margin:0 0 1.5rem}