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forwards}.auth-switch{text-align:center;color:var(--auth-muted);margin-bottom:0;font-size:.86rem;font-weight:500}.auth-switch .auth-link{font-size:inherit}.auth-divider{color:var(--auth-faint);align-items:center;gap:12px;font-size:.76rem;font-weight:600;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--auth-line);flex:1;height:1px}.auth-sso{border:1px solid var(--auth-line-strong);background:var(--auth-field);width:100%;height:42px;color:var(--auth-muted);font:inherit;cursor:not-allowed;border-radius:6px;justify-content:center;align-items:center;gap:8px;font-size:.88rem;font-weight:600;display:inline-flex}.auth-footer{color:var(--auth-faint);flex-wrap:wrap;grid-area:foot;justify-content:center;align-items:center;gap:6px 16px;padding:8px 4px 0;font-size:.78rem;font-weight:500;display:flex}.auth-footer-links{align-items:center;gap:10px;display:inline-flex}.auth-footer-link{color:var(--auth-muted);font:inherit;cursor:pointer;transition:color .2s var(--auth-ease);background:0 0;border:0;padding:0}.auth-footer-link:hover{color:var(--auth-text)}.auth-footer-sep{opacity:.6;background:currentColor;border-radius:50%;width:3px;height:3px}.auth-dialog{background:var(--auth-paper);width:min(24rem,100% - 32px);max-width:none;max-height:min(84vh,38rem);color:var(--auth-text);box-shadow:0 0 0 1px var(--auth-line), 0 30px 80px -20px #02081780;opacity:0;transition:opacity .22s var(--auth-ease), transform .34s var(--auth-ease-out), overlay .34s allow-discrete, display .34s allow-discrete;border:0;border-radius:20px;margin:auto;padding:0;overflow:hidden;transform:translateY(12px)scale(.97)}.auth-dialog.is-wide{width:min(32rem,100% - 32px)}.auth-dialog[open]{opacity:1;transform:none}@starting-style{.auth-dialog[open]{opacity:0;transform:translateY(12px)scale(.97)}}.auth-dialog::backdrop{-webkit-backdrop-filter:blur();backdrop-filter:blur();transition:background-color .3s var(--auth-ease), backdrop-filter .3s var(--auth-ease), overlay .3s allow-discrete, display .3s allow-discrete;background:#050e1c00}.auth-dialog[open]::backdrop{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#050e1c73}@starting-style{.auth-dialog[open]::backdrop{-webkit-backdrop-filter:blur();backdrop-filter:blur();background:#050e1c00}}.auth-dialog-panel{max-height:inherit;box-sizing:border-box;flex-direction:column;padding:18px 20px 20px;display:flex}.auth-dialog-header{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.auth-dialog-header h2{margin:0;font-size:1.05rem;font-weight:800}.auth-dialog-close{background:var(--auth-field);width:34px;height:34px;color:var(--auth-muted);cursor:pointer;transition:background-color .2s var(--auth-ease), color .2s var(--auth-ease);border:0;border-radius:10px;place-items:center;display:grid}.auth-dialog-close svg{transition:transform .35s var(--auth-ease-out)}.auth-dialog-close:hover{background:var(--auth-field-hover);color:var(--auth-text)}.auth-dialog-close:hover svg{transform:rotate(90deg)}.auth-dialog-scroll{overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--auth-line-strong) transparent;flex-direction:column;gap:14px;min-height:0;padding-inline-end:4px;display:flex;overflow:auto}.auth-guide-panel{animation:auth-fade-up .32s var(--auth-ease-out) both}.auth-dialog-intro,.auth-dialog-section p,.auth-dialog-section ol,.auth-dialog-note{color:var(--auth-muted);margin:0;font-size:.86rem;font-weight:500;line-height:1.8}.auth-dialog-section h3{margin:0 0 4px;font-size:.9rem;font-weight:800}.auth-dialog-section ol{padding-inline-start:1.15rem}.auth-dialog-note{border-top:1px solid var(--auth-line);color:var(--auth-text);padding-top:12px;font-weight:600}.auth-segmented{background:var(--auth-field);border-radius:12px;grid-template-columns:1fr 1fr;margin-bottom:16px;padding:4px;display:grid;position:relative}.auth-segmented:before{content:"";background:var(--auth-button);width:calc(50% - 4px);box-shadow:0 6px 16px -8px var(--auth-button-shadow);transition:inset-inline-start .38s var(--auth-ease-out);border-radius:9px;position:absolute;inset-block:4px;inset-inline-start:4px}.auth-segmented[data-active=PROFESSOR]:before{inset-inline-start:50%}.auth-segmented-option{color:var(--auth-muted);font:inherit;cursor:pointer;transition:color .25s var(--auth-ease);background:0 0;border:0;border-radius:9px;padding:9px 8px;font-size:.86rem;font-weight:700;position:relative}.auth-segmented-option.is-active{color:var(--auth-button-text)}.auth-contact-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.auth-contact-item{align-items:flex-start;gap:12px;display:flex}.auth-contact-icon{background:var(--auth-soon-bg);width:34px;height:34px;color:var(--auth-accent);border-radius:10px;flex-shrink:0;place-items:center;display:grid}.auth-contact-text{color:var(--auth-text);padding-top:6px;font-size:.88rem;font-weight:600;line-height:1.6}.auth-contact-text a{color:inherit;unicode-bidi:isolate;text-decoration:none}.auth-contact-text a:hover{color:var(--auth-accent)}.is-intro .auth-reveal{animation:auth-rise .64s var(--auth-ease-out) both;animation-delay:calc(var(--i,0) * 55ms + 60ms)}@keyframes auth-rise{0%{opacity:0;filter:blur(3px);transform:translateY(10px)}to{opacity:1;filter:none;transform:none}}@keyframes auth-fade-down{0%{opacity:0;transform:translateY(-4px)}}@keyframes auth-fade-up{0%{opacity:0;transform:translateY(6px)}}@keyframes auth-shake{0%,to{transform:none}20%{transform:translate(-6px)}40%{transform:translate(5px)}60%{transform:translate(-3px)}80%{transform:translate(2px)}}@keyframes auth-spin{to{transform:rotate(360deg)}}@keyframes auth-draw{to{stroke-dashoffset:0}}::view-transition-group(auth-title){animation-duration:.42s;animation-timing-function:cubic-bezier(.22,1,.36,1)}::view-transition-group(auth-submit){animation-duration:.42s;animation-timing-function:cubic-bezier(.22,1,.36,1)}::view-transition-old(root){animation-duration:.28s}::view-transition-new(root){animation-duration:.28s}@media (width<=640px){.auth-shell{padding:12px 14px 16px}.auth-headline{font-size:1.35rem}.auth-chip-label{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.auth-chip-button:not(.auth-lang){justify-content:center;width:36px;padding:0}.auth-form-grid{grid-template-columns:1fr}.auth-footer{text-align:center;flex-direction:column;gap:6px;padding-bottom:4px}.auth-dialog,.auth-dialog.is-wide{border-radius:22px 22px 0 0;width:100%;max-height:88dvh;margin:auto 0 0;transform:translateY(100%)}.auth-dialog[open]{transform:none}@starting-style{.auth-dialog[open]{transform:translateY(100%)}}}@media (prefers-reduced-motion:reduce){.auth-page *,.auth-page :before,.auth-page :after,.auth-dialog,.auth-dialog::backdrop{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important;animation-delay:0s!important}::view-transition-group(*){animation:none!important}::view-transition-old(*){animation:none!important}::view-transition-new(*){animation:none!important}}html .auth-page{--auth-accent:var(--delta-action);--auth-ring:var(--delta-focus-ring);--auth-button:var(--delta-action);--auth-button-text:var(--delta-action-foreground);--auth-button-shadow:color-mix(in srgb, var(--delta-action) 32%, transparent);--auth-danger:var(--delta-danger)}html[data-public-theme=dark] .auth-page{--auth-accent:var(--delta-action);--auth-ring:var(--delta-focus-ring);--auth-button:var(--delta-action);--auth-button-text:var(--delta-action-foreground);--auth-button-shadow:color-mix(in srgb, var(--delta-action) 36%, transparent);--auth-danger:var(--delta-danger)}html .auth-submit{min-block-size:44px;height:44px;box-shadow:0 1px 2px color-mix(in srgb, var(--delta-brand) 8%, transparent);border-radius:8px;font-family:Vazirmatn,Tahoma,sans-serif;font-size:14px;font-weight:500;transition:background-color .2s,color .2s,box-shadow .2s,transform .2s,opacity .2s,filter .2s}html .auth-submit:before{background:linear-gradient(110deg,#0000 35%,#ffffff1f 50%,#0000 65%)}html .auth-submit[data-state=idle]:hover{filter:none;background:var(--delta-action-hover);color:var(--delta-action-hover-foreground);box-shadow:0 2px 6px color-mix(in srgb, var(--delta-brand) 18%, transparent)}html .auth-submit[data-state=idle]:active{background:color-mix(in srgb, var(--delta-action-hover) 88%, #000);color:var(--delta-action-hover-foreground)}html .auth-submit[data-state=busy],html .auth-submit.is-loading,html .auth-submit[aria-busy=true]{cursor:progress}html .auth-submit:disabled{background:var(--delta-disabled);color:var(--delta-text-muted);box-shadow:none;cursor:not-allowed}html .auth-page .auth-submit:focus-visible,html .auth-chip-button:focus-visible,html .auth-page .auth-icon-button:focus-visible{outline:2px solid var(--delta-action-accent);outline-offset:2px}html .lp-page{--lp-accent:var(--delta-action);--lp-accent-soft:color-mix(in srgb, var(--delta-action-accent) 14%, var(--lp-soft,#f7fafc));--lp-navy:var(--delta-brand)}html[data-public-theme=dark] .lp-page{--lp-accent:var(--delta-action);--lp-accent-soft:color-mix(in srgb, var(--delta-action-accent) 18%, var(--lp-soft,#0b1220))}html .lp-btn{font-family:Vazirmatn,Tahoma,sans-serif;font-weight:500;transition:background-color .2s,color .2s,border-color .2s,box-shadow .2s,transform .2s}html .lp-btn-primary{background:var(--delta-action);color:var(--delta-action-foreground);box-shadow:0 4px 14px color-mix(in srgb, var(--delta-action) 28%, transparent)}html .lp-btn-primary:hover{background:var(--delta-action-hover);color:var(--delta-action-hover-foreground)}html .lp-btn-primary:active{background:color-mix(in srgb, var(--delta-action-hover) 88%, #000);color:var(--delta-action-hover-foreground)}html .lp-btn-primary:disabled,html .lp-btn-primary.is-loading,html .lp-btn-primary[aria-busy=true]{background:var(--delta-disabled);color:var(--delta-text-muted);box-shadow:none;cursor:not-allowed}html .lp-btn-primary.is-loading,html .lp-btn-primary[aria-busy=true]{opacity:.72;cursor:progress;pointer-events:none}html .lp-btn-ghost{background:var(--delta-surface);color:var(--delta-text);border-color:color-mix(in srgb, var(--delta-text) 16%, var(--delta-border))}html .lp-btn-ghost:hover{background:color-mix(in srgb, var(--delta-action-accent) 10%, var(--delta-surface));border-color:color-mix(in srgb, var(--delta-action-accent) 32%, var(--delta-border));color:var(--delta-text)}html .lp-btn-on-dark{background:var(--delta-surface);color:var(--delta-text);border-color:color-mix(in srgb, var(--delta-text) 16%, var(--delta-border))}html .lp-btn-on-dark:hover{background:color-mix(in srgb, var(--delta-action-accent) 10%, var(--delta-surface));border-color:color-mix(in srgb, var(--delta-action-accent) 32%, var(--delta-border))}html .lp-btn:focus-visible{outline:2px solid var(--delta-action-accent);outline-offset:2px}html .lp-btn-lg{border-radius:8px;min-block-size:44px;padding-block:.65rem;font-size:14px}html .course-editor-mode-chip.active{background:var(--delta-action);color:var(--delta-action-foreground);font-weight:500}html .course-editor-mode-chip.active:hover{background:var(--delta-action-hover);color:var(--delta-action-hover-foreground)}html .course-editor-mode-chip:focus-visible{outline:2px solid var(--delta-action-accent);outline-offset:2px}html .course-workspace-chip.is-button.is-active,html .course-workspace-chip.is-button[aria-pressed=true],html .course-workspace-chip.is-button[aria-expanded=true]{color:var(--delta-action);border-color:color-mix(in srgb, var(--delta-action-accent) 32%, var(--delta-border));background:color-mix(in srgb, var(--delta-action-accent) 10%, var(--delta-surface))}html .course-workspace-chip.is-button:focus-visible{outline:2px solid var(--delta-action-accent);outline-offset:2px}.delta-loading{--dl-ink:var(--delta-text,#1e293b);--dl-muted:var(--delta-text-muted,#64748b);--dl-paper:var(--delta-page,#f8fafc);--dl-accent:var(--delta-action,#00a896);--dl-accent-soft:#14b8a6;--dl-navy:var(--delta-brand,#0f2c59);box-sizing:border-box;color:var(--dl-ink);text-align:center;place-content:center;justify-items:center;gap:.85rem;padding:2rem;font-family:Vazirmatn,Tahoma,sans-serif;display:grid}.delta-loading.is-page{background:radial-gradient(ellipse 55% 40% at 70% 20%, color-mix(in srgb, var(--dl-accent) 12%, transparent), transparent 55%), radial-gradient(ellipse 50% 45% at 20% 80%, color-mix(in srgb, var(--dl-accent-soft) 10%, transparent), transparent 50%), linear-gradient(165deg, #fff 0%, var(--dl-paper) 48%, #eef3f9 100%);width:100%;min-height:100svh}.delta-loading.is-page.is-boot-pending{background:var(--dl-paper);gap:0;padding:0}.delta-loading.is-overlay{z-index:200;-webkit-backdrop-filter:blur(10px)saturate(1.1);opacity:0;visibility:hidden;pointer-events:none;background:#f7fafcb8;transition:opacity .22s,visibility .22s;position:fixed;inset:0}.delta-loading.is-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}html[data-public-theme=dark] .delta-loading,html[data-prof-theme=dark] .delta-loading,html[data-stu-theme=dark] .delta-loading,.delta-loading[data-tone=inverse]{--dl-ink:#e8eef7;--dl-muted:#9db0c5;--dl-paper:#0b1628;--dl-navy:#e8eef7;--dl-accent:var(--delta-action,#00a896)}html[data-public-theme=dark] .delta-loading.is-page,html[data-prof-theme=dark] .delta-loading.is-page,html[data-stu-theme=dark] .delta-loading.is-page,.delta-loading.is-page[data-tone=inverse]{background:radial-gradient(ellipse 55% 40% at 70% 20%, color-mix(in srgb, var(--dl-accent) 14%, transparent), 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12px;min-block-size:14rem;padding:1.35rem 1.4rem 2rem}.subsection-lesson-paper:has(.lesson-read-scroll-inner){padding:0}.subsection-lesson-stage .lesson-read-view h2{color:var(--lesson-ink);margin-block:.5em .25em;font-size:1.375em;font-weight:650}.subsection-lesson-note{text-align:center;color:var(--lesson-muted);margin:0;padding:2.2rem .5rem 1.4rem;font-size:.95rem;line-height:1.8}html[data-prof-theme=dark] .subsection-lesson-stage,html[data-stu-theme=dark] .subsection-lesson-stage{--lesson-ink:#f3f4f6;--lesson-muted:#cbd5e1;--lesson-rule:#374151;--lesson-accent:#00a896;--lesson-paper:#111827;--lesson-workspace:#0b1220;--lesson-panel:#0d1526;--lesson-canvas-edge:#4b5563;--lesson-ltr-ink:color-mix(in srgb, var(--lesson-ink) 82%, transparent);--lesson-wash:color-mix(in srgb, var(--lesson-accent) 14%, transparent);--lesson-code:#1f2937;color:var(--lesson-ink)}@media 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.cw-spinner{color:var(--lesson-accent)}.lesson-read-shell{--lesson-surface:var(--lesson-paper,#fff);--lesson-surface-muted:var(--lesson-workspace,#f9fafb);--lesson-text:var(--lesson-ink,#111827);--lesson-text-muted:#6b7280;--lesson-border-hairline:color-mix(in srgb, var(--lesson-text) 12%, transparent);--lesson-accent:#00a896;--lesson-selection-bg:#fbbf2459;--lesson-selection-bg-strong:#fbbf248c;--lesson-radius:12px;--lesson-radius-control:8px;--lesson-read-topbar-height:3.25rem;--lesson-contents-rail-width:2.75rem;--lesson-contents-rail-expanded:16.5rem;--lesson-examples-rail-width:2.75rem;--lesson-examples-rail-expanded:18.5rem;--lesson-assistant-width:400px;--lesson-border-strong:color-mix(in srgb, var(--lesson-text) 24%, transparent);--lesson-border-stronger:color-mix(in srgb, var(--lesson-text) 36%, transparent);--lesson-surface-1:var(--lesson-surface-muted);--lesson-read-success:#16a34a;--ramp-teal-bg:#e1f5ee;--ramp-teal-border:#0f6e56;--ramp-teal-title:#085041;--ramp-teal-body:#0f6e56;--ramp-amber-bg:#faeeda;--ramp-amber-border:#854f0b;--ramp-amber-title:#633806;--ramp-amber-body:#854f0b;--ramp-purple-bg:#eeedfe;--ramp-purple-border:#534ab7;--ramp-purple-title:#3c3489;--ramp-purple-body:#534ab7;background:var(--lesson-surface-muted);height:100dvh;max-height:100dvh;font-family:var(--lesson-font);color:var(--lesson-text);flex-direction:column;display:flex;overflow:hidden}[data-stu-theme=dark] .lesson-read-shell,[data-prof-theme=dark] .lesson-read-shell{--lesson-surface:#111827;--lesson-surface-muted:#0b1220;--lesson-text:#f3f4f6;--lesson-text-muted:#cbd5e1;--lesson-ink:var(--lesson-text);--lesson-muted:var(--lesson-text-muted);--lesson-code:#1f2937;--lesson-rule:color-mix(in srgb, var(--lesson-text) 30%, transparent);--lesson-border-hairline:color-mix(in srgb, var(--lesson-text) 18%, transparent);--lesson-accent:#00a896;--lesson-selection-bg:#fbbf2447;--lesson-selection-bg-strong:#fbbf247a;--lesson-read-success:#4ade80;--lesson-border-strong:color-mix(in srgb, var(--lesson-text) 30%, transparent);--lesson-border-stronger:color-mix(in srgb, var(--lesson-text) 42%, transparent);--ramp-teal-bg:#085041;--ramp-teal-border:#5dcaa5;--ramp-teal-title:#9fe1cb;--ramp-teal-body:#5dcaa5;--ramp-amber-bg:#633806;--ramp-amber-border:#ef9f27;--ramp-amber-title:#fac775;--ramp-amber-body:#ef9f27;--ramp-purple-bg:#3c3489;--ramp-purple-border:#afa9ec;--ramp-purple-title:#cecbf6;--ramp-purple-body:#afa9ec}html[data-prof-theme=dark] .lesson-read-shell .lesson-read-view,html[data-stu-theme=dark] .lesson-read-shell .lesson-read-view,html[data-prof-theme=dark] .lesson-read-shell .lesson-read-view .ProseMirror,html[data-stu-theme=dark] .lesson-read-shell .lesson-read-view .ProseMirror{color:var(--lesson-text)}html[data-prof-theme=dark] .lesson-read-shell .lesson-read-view [style*=color],html[data-stu-theme=dark] .lesson-read-shell .lesson-read-view [style*=color]{color:var(--lesson-text)!important}html[data-prof-theme=dark] .lesson-read-shell .lesson-ask-rail,html[data-stu-theme=dark] .lesson-read-shell .lesson-ask-rail{--lesson-ink:var(--lesson-text);--lesson-muted:var(--lesson-text-muted);--lesson-rule:color-mix(in srgb, var(--lesson-text) 30%, transparent);--lesson-workspace:var(--lesson-surface-muted);--lesson-paper:var(--lesson-surface);--lesson-panel:var(--lesson-surface-muted);color:var(--lesson-text)}html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-composer-zone,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-composer-zone{border-block-start-color:var(--lesson-border-hairline);background:0 0}html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-composer,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-composer{background:var(--lesson-surface-muted);border-color:var(--lesson-border-hairline);color:var(--lesson-text)}html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-composer-input,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-composer-input{color:var(--lesson-text);background:0 0}html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-pill-main,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-pill-main{color:var(--lesson-text)}html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-pill-remove,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-pill-remove,html[data-prof-theme=dark] .lesson-read-shell .lesson-assistant-composer-input::placeholder,html[data-stu-theme=dark] .lesson-read-shell .lesson-assistant-composer-input::placeholder{color:var(--lesson-text-muted)}html[data-prof-theme=dark] .lesson-read-shell .lesson-ask-rail-header,html[data-stu-theme=dark] .lesson-read-shell .lesson-ask-rail-header{background:var(--lesson-surface);border-block-end-color:var(--lesson-border-hairline)}html[data-prof-theme=dark] .lesson-read-shell .lesson-study-tabs,html[data-stu-theme=dark] .lesson-read-shell .lesson-study-tabs{background:color-mix(in srgb, var(--lesson-surface-muted) 90%, var(--lesson-accent) 10%);border-color:var(--lesson-border-hairline)}html[data-prof-theme=dark] .lesson-read-shell .lesson-study-tab.is-active,html[data-stu-theme=dark] .lesson-read-shell .lesson-study-tab.is-active{color:#93c5fd;background:#0f172a;box-shadow:0 1px 2px #00000059}html[data-prof-theme=dark] .lesson-read-shell .lesson-ask-starter-chip,html[data-stu-theme=dark] .lesson-read-shell .lesson-ask-starter-chip{background:var(--lesson-surface);border-color:var(--lesson-border-hairline);color:var(--lesson-text)}html[data-prof-theme=dark] .lesson-read-shell .lesson-ask-starter-chip:hover:not(:disabled),html[data-stu-theme=dark] .lesson-read-shell 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100%)}.lp-page{--lp-ink:#12263f;--lp-muted:#5b6b7c;--lp-paper:#fff;--lp-white:#fff;--lp-soft:#f7fafc;--lp-band-alt:#eaf0f7;--lp-nav-bg:#ffffffeb;--lp-navy:var(--delta-brand,#0f2c59);--lp-navy-deep:#061828;--lp-accent:var(--delta-action,#00a896);--lp-accent-soft:var(--delta-accent-soft,#ccfbf1);--lp-teal:#14b8a6;--lp-line:#0f28461a;--lp-shadow:0 22px 48px #0f28461a;--lp-scene-soft:#f9fafb;min-height:100svh;color:var(--lp-ink);background:var(--lp-paper);font-family:Vazirmatn,Tahoma,sans-serif;position:relative;overflow-x:clip}.lp-bg{pointer-events:none;z-index:0;background:radial-gradient(ellipse 70% 50% at 85% 0%, #14b8a61a, transparent 55%), radial-gradient(ellipse 65% 45% at 10% 5%, #1f6fd61a, transparent 50%), linear-gradient(180deg, var(--lp-paper) 0%, var(--lp-soft) 55%, var(--lp-paper) 100%);block-size:min(88vh,52rem);position:absolute;inset:0 0 auto}.lp-bg-delta{inset-inline-end:-4%;aspect-ratio:1;opacity:.07;background:url(/brand/delta-mark.png) 50%/contain no-repeat;inline-size:min(42vw,24rem);position:absolute;top:6%}.lp-bg-grid{opacity:.45;background-image:linear-gradient(#0b2a520a 1px,#0000 1px),linear-gradient(90deg,#0b2a520a 1px,#0000 1px);background-size:48px 48px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#000 25%,#0000 90%);mask-image:linear-gradient(#000 25%,#0000 90%)}.lp-page>:not(.lp-bg){z-index:1;position:relative}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;block-size:1px;inline-size:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.lp-nav{z-index:20;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:var(--lp-nav-bg);border-bottom:1px solid var(--lp-line);position:sticky;top:0}.lp-nav-inner{justify-content:space-between;align-items:center;gap:1rem;width:min(1120px,100% - 2rem);margin-inline:auto;padding-block:.7rem;display:flex}.lp-nav-brand{color:var(--lp-navy);align-items:center;gap:.65rem;text-decoration:none;display:inline-flex}.lp-nav-brand img{object-fit:contain;flex-shrink:0;display:block}.lp-nav-name{letter-spacing:.02em;color:var(--lp-navy);font-size:1.45rem}.lp-nav-actions{flex-shrink:0;align-items:center;gap:.55rem;display:flex}.lp-lang{align-items:center;display:inline-flex;position:relative}.lp-lang select{appearance:none;border:1px solid var(--lp-line);background-color:var(--lp-white);color:var(--lp-ink);min-inline-size:5.75rem;font:inherit;text-align:center;text-align-last:center;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%235b6b7c' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-size:.7rem;border-radius:999px;padding-block:.4rem;padding-inline:1.15rem 1.9rem;font-size:.85rem;font-weight:700;line-height:1.35}.lp-lang select[dir=rtl]{background-position:.75rem}.lp-lang select[dir=ltr]{background-position:right .75rem center}.lp-theme-toggle{border:1px solid var(--lp-line);background:var(--lp-white);color:var(--lp-navy);border-radius:999px}.lp-btn{font:inherit;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:.35rem;padding:.45rem 1rem;font-size:.9rem;font-weight:700;text-decoration:none;transition:background .16s,color .16s,border-color .16s,transform .16s;display:inline-flex}.lp-btn:focus-visible{outline:2px solid var(--delta-action-accent,#00a896);outline-offset:2px}.lp-btn-primary{background:var(--lp-accent);color:var(--delta-action-foreground,#0f2c59);box-shadow:0 8px 20px color-mix(in srgb, var(--lp-accent) 35%, transparent)}.lp-btn-primary:hover{background:var(--delta-action-hover,#0f2c59);color:var(--delta-action-hover-foreground,#fff)}.lp-btn-ghost{background:var(--lp-white);color:var(--lp-navy);border-color:var(--lp-line)}.lp-btn-ghost:hover{background:var(--lp-accent-soft);border-color:color-mix(in 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img{object-fit:contain;border-radius:12px;flex-shrink:0;block-size:3.25rem;inline-size:3.25rem}.lp-partner-card span{color:var(--lp-navy);font-size:.92rem;font-weight:800;line-height:1.35}.lp-demo-section{z-index:1;background:linear-gradient(180deg, var(--lp-paper) 0%, var(--lp-soft) 40%, var(--lp-paper) 100%);margin-block-start:0;padding:2.75rem 0 4rem;position:relative}.lp-demo-section-inner{width:min(1120px,100% - 2rem);margin-inline:auto}.lp-demo-intro{text-align:center;color:var(--lp-navy);margin-block-end:1.25rem}.lp-demo-intro h2{margin:0 0 .5rem;font-size:clamp(1.25rem,2.4vw,1.65rem);font-weight:800}.lp-demo-intro p{color:var(--lp-muted);margin:0;line-height:1.65}.lp-demo{background:var(--lesson-workspace,#f9fafb);border:1px solid var(--lp-line);box-shadow:var(--lp-shadow);color:var(--lp-ink);text-align:start;border-radius:16px;overflow:visible}.lp-demo.lesson-page-surface{min-height:0;padding:0}.lp-demo-chrome{background:var(--lp-band-alt);border-bottom:1px solid 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.lesson-agent-card-body{max-height:11.5rem}.lp-scene-profai-demo.phase-press .lesson-agent-btn.is-apply,.lp-scene-profai-demo.phase-applying .lesson-agent-btn.is-apply{background:color-mix(in srgb, var(--agent-add) 22%, var(--lesson-paper,#fff));border-color:var(--agent-add);color:var(--agent-add);box-shadow:none;animation:none;transform:scale(.92)}.lp-scene-profai-demo.phase-applying .lesson-agent-card,.lp-scene-profai-demo.phase-flying .lesson-agent-card{border-inline-start-color:var(--agent-add);box-shadow:0 0 0 3px color-mix(in srgb, var(--agent-add) 16%, transparent)}.lp-scene-profai-demo.phase-flying .lp-profai-target-slot,.lp-scene-profai-demo.phase-morph .lp-profai-target-slot{animation:lp-profai-receive calc(.55s * var(--lp-profai-pace,1)) ease}.lp-scene-profai-demo.phase-flying .lp-profai-doc{position:relative}.lp-scene-profai-demo.phase-flying .lp-profai-doc:after{content:"";background:var(--agent-add);width:.55rem;height:.55rem;box-shadow:0 0 0 6px color-mix(in srgb, 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