.lesson-page[data-v-18feb1b6]{flex-direction:column;gap:16px;display:flex}.card[data-v-18feb1b6]{background:var(--color-card-bg);color:var(--color-card-text);border:1px solid var(--color-card-border);border-radius:16px;padding:14px}.head[data-v-18feb1b6]{flex-direction:column}.head[data-v-18feb1b6],.head-top[data-v-18feb1b6]{gap:12px;display:flex}.head-top[data-v-18feb1b6]{justify-content:space-between;align-items:flex-start}.head-top>div[data-v-18feb1b6]{min-width:0}.lesson-page__head-main[data-v-18feb1b6]{align-items:flex-start;gap:14px;display:flex}.lesson-page__head-copy[data-v-18feb1b6]{min-width:0}.lesson-page__header-cover[data-v-18feb1b6]{aspect-ratio:1;border:1px solid var(--color-card-border);background:color-mix(in srgb,var(--color-card-bg) 88%,#000);border-radius:14px;flex:none;width:clamp(86px,11vw,124px);margin:0;overflow:hidden}.lesson-page__header-cover img[data-v-18feb1b6]{-o-object-fit:cover;object-fit:cover;width:100%;height:100%;display:block}.lesson-page__order-chip[data-v-18feb1b6]{border:1px solid var(--color-card-border);min-width:60px;color:var(--color-card-muted);letter-spacing:.04em;border-radius:999px;flex-shrink:0;justify-content:center;align-items:center;padding:7px 12px;font-size:13px;font-weight:700;display:inline-flex}.title[data-v-18feb1b6]{margin:0;font-size:28px}.desc[data-v-18feb1b6]{color:var(--color-card-muted);margin-top:8px}.meta[data-v-18feb1b6]{flex-wrap:wrap;gap:8px;display:flex}.tag[data-v-18feb1b6]{border:1px solid var(--color-card-border);border-radius:999px;padding:4px 10px;font-size:13px}.lesson-page__utility-actions[data-v-18feb1b6]{justify-content:space-between;align-items:center;gap:12px;display:flex}.actions[data-v-18feb1b6],.lesson-page__utility-primary-actions[data-v-18feb1b6]{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.actions[data-v-18feb1b6]{margin-top:12px}.article[data-v-18feb1b6]{padding-block:clamp(22px,3vw,38px);padding-inline:var(--lesson-reading-shell-inline-padding,clamp(22px,3vw,38px));background:linear-gradient(180deg,color-mix(in srgb,var(--color-card-bg) 97%,#fff),color-mix(in srgb,var(--color-card-bg) 94%,#131416))}.lesson-page__reading-tools[data-v-18feb1b6]{margin-bottom:22px}.lesson-page__reading-tools-desktop[data-v-18feb1b6]{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.lesson-page__reading-tools-mobile[data-v-18feb1b6]{justify-content:flex-end;width:100%;display:none}.lesson-page__reading-menu-trigger[data-v-18feb1b6]{border:1px solid var(--color-card-border);background:color-mix(in srgb,var(--color-card-bg) 82%,#fff);inline-size:2.25rem;min-inline-size:2.25rem;padding-inline:0}.lesson-page__reading-tools-group[data-v-18feb1b6]{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.lesson-page__reading-tools-label[data-v-18feb1b6]{color:var(--color-card-muted);letter-spacing:.06em;text-transform:uppercase;font-size:13px;font-weight:700}.lesson-page__reading-toggle[data-v-18feb1b6]{align-items:center;gap:12px;display:inline-flex}.lesson-page__reading-toggles[data-v-18feb1b6]{flex-wrap:wrap;justify-content:flex-end;gap:16px;margin-left:auto;display:inline-flex}.lesson-page__reading-select[data-v-18feb1b6]{min-width:164px}.lesson-page__reading-menu[data-v-18feb1b6]{gap:12px;min-width:min(296px,100vw - 56px);display:grid}.lesson-page__reading-menu-row[data-v-18feb1b6]{justify-content:space-between;align-items:center;gap:12px;min-height:36px;display:flex}.lesson-page__reading-menu-row--slot[data-v-18feb1b6] .lesson-page__tts-trigger{justify-content:space-between;width:100%}.lesson-page__reading-menu-row--slot[data-v-18feb1b6] .lesson-page__tts-trigger .p-button{flex:0 auto;justify-content:flex-start;padding-inline:0}.lesson-page__reading-menu-row--slot[data-v-18feb1b6] .lesson-page__tts-trigger .p-button-label{color:var(--color-card-muted);letter-spacing:.06em;text-transform:uppercase;font-size:13px;font-weight:700}.lesson-page__reading-menu-select[data-v-18feb1b6]{width:148px;min-width:0}.lesson-page__article-body[data-v-18feb1b6]{--lesson-reading-font-family:inherit;--lesson-reading-font-size:18px;--lesson-reading-line-height:1.82;--lesson-reading-max-width:46rem;--lesson-reading-paragraph-gap:1.2rem}.lesson-page__article-body[data-v-18feb1b6] p:first-child{margin-top:0}.lesson-page__article-body[data-v-18feb1b6] blockquote,.lesson-page__article-body[data-v-18feb1b6] figure,.lesson-page__article-body[data-v-18feb1b6] h1,.lesson-page__article-body[data-v-18feb1b6] h2,.lesson-page__article-body[data-v-18feb1b6] h3,.lesson-page__article-body[data-v-18feb1b6] h4,.lesson-page__article-body[data-v-18feb1b6] h5,.lesson-page__article-body[data-v-18feb1b6] h6,.lesson-page__article-body[data-v-18feb1b6] hr,.lesson-page__article-body[data-v-18feb1b6] ol,.lesson-page__article-body[data-v-18feb1b6] p,.lesson-page__article-body[data-v-18feb1b6] pre,.lesson-page__article-body[data-v-18feb1b6] table,.lesson-page__article-body[data-v-18feb1b6] ul{max-width:var(--lesson-reading-max-width);margin-left:auto;margin-right:auto}.lesson-page__article-body[data-v-18feb1b6] li,.lesson-page__article-body[data-v-18feb1b6] p{font-family:var(--lesson-reading-font-family);font-size:var(--lesson-reading-font-size);line-height:var(--lesson-reading-line-height);color:color-mix(in srgb,var(--color-card-text) 92%,#fff)}.lesson-page__article-body[data-v-18feb1b6] p{margin-top:0;margin-bottom:var(--lesson-reading-paragraph-gap)}.lesson-page__article-body[data-v-18feb1b6] p+p{margin-top:0}.lesson-page__article-body[data-v-18feb1b6] h1,.lesson-page__article-body[data-v-18feb1b6] h2,.lesson-page__article-body[data-v-18feb1b6] h3,.lesson-page__article-body[data-v-18feb1b6] h4{font-family:var(--lesson-reading-font-family);letter-spacing:-.03em;color:var(--color-card-text);text-wrap:balance;margin-top:1.8em;margin-bottom:.65em;line-height:1.12}.lesson-page__article-body[data-v-18feb1b6] h1{font-size:clamp(32px,3.6vw,44px)}.lesson-page__article-body[data-v-18feb1b6] h2{font-size:clamp(26px,2.8vw,34px)}.lesson-page__article-body[data-v-18feb1b6] h3{font-size:clamp(22px,2.2vw,28px)}.lesson-page__article-body[data-v-18feb1b6] h4{font-size:clamp(18px,1.8vw,22px)}.lesson-page__article-body[data-v-18feb1b6] ol,.lesson-page__article-body[data-v-18feb1b6] ul{margin-top:1.15em;margin-bottom:1.15em;padding-left:1.35em}.lesson-page__article-body[data-v-18feb1b6] li+li{margin-top:.55em}.lesson-page__article-body[data-v-18feb1b6] blockquote{border-left:3px solid color-mix(in srgb,var(--color-card-border) 65%,#fff);background:color-mix(in srgb,var(--color-card-bg) 84%,#fff);border-radius:16px;margin-top:1.4em;margin-bottom:1.4em;padding:18px 20px}.lesson-page__article-body[data-v-18feb1b6] blockquote p{color:var(--color-card-text)}.lesson-page__article-body[data-v-18feb1b6] a{color:color-mix(in srgb,var(--color-card-text) 84%,#fff);text-underline-offset:.18em;text-decoration-thickness:.08em}.lesson-page__article-body[data-v-18feb1b6] strong{color:var(--color-card-text);font-weight:700}.lesson-page__article-body[data-v-18feb1b6] iframe,.lesson-page__article-body[data-v-18feb1b6] img:not(.ai-formula),.lesson-page__article-body[data-v-18feb1b6] video{border-radius:18px;width:100%;max-width:min(100%,78ch);margin:1.6rem auto;display:block}.lesson-page__article-body[data-v-18feb1b6] img.ai-formula,.lesson-page__article-body[data-v-18feb1b6] img[alt=formula]{vertical-align:middle;width:auto;max-width:100%;height:auto;filter:var(--formula-image-filter);border-radius:0;margin:0 .08em;display:inline-block}.lesson-page__article-body[data-v-18feb1b6] figure{margin-top:1.6rem;margin-bottom:1.6rem}.lesson-page__article-body[data-v-18feb1b6] figcaption{max-width:var(--lesson-reading-max-width);color:var(--color-card-muted);text-align:center;margin:-.7rem auto 0;font-size:14px;line-height:1.5}.lesson-page__article-body[data-v-18feb1b6] pre{border:1px solid var(--color-card-border);background:color-mix(in srgb,var(--color-card-bg) 78%,#000);border-radius:16px;padding:16px 18px;overflow-x:auto}.lesson-page__article-body[data-v-18feb1b6] code{font-size:.92em}.lesson-page__article-body[data-v-18feb1b6] table{border-collapse:collapse;border:1px solid var(--color-card-border);border-radius:16px;width:100%;overflow:hidden}.lesson-page__article-body[data-v-18feb1b6] td,.lesson-page__article-body[data-v-18feb1b6] th{border-bottom:1px solid var(--color-card-border);text-align:left;padding:12px 14px}.lesson-page__article-body[data-v-18feb1b6] th{color:var(--color-card-text);font-weight:700}.lesson-page__article-body[data-v-18feb1b6] hr{background:linear-gradient(90deg,transparent,var(--color-card-border),transparent);border:0;height:1px;margin-top:2rem;margin-bottom:2rem}.lesson-page__article-body[data-v-18feb1b6] .lesson-page__tts-segment{border-radius:14px;transition:background-color .2s,box-shadow .2s}.lesson-page__article-body[data-v-18feb1b6] .lesson-page__tts-segment[data-tts-active=true]{box-shadow:0 0 0 1px color-mix(in srgb,var(--color-card-border) 72%,#fff);background:#dbeafe12}.section-title[data-v-18feb1b6]{margin-bottom:10px;font-weight:700}.video[data-v-18feb1b6]{border-radius:12px;width:100%}.transcript[data-v-18feb1b6]{border:1px solid var(--color-card-border);border-radius:10px;margin-top:10px;padding:10px}.lesson-page__empty[data-v-18feb1b6]{background:radial-gradient(circle at top right,color-mix(in srgb,var(--color-primary) 16%,transparent),transparent 26%),linear-gradient(135deg,color-mix(in srgb,var(--color-card-bg) 94%,#fff),var(--color-card-bg));flex-direction:column;gap:8px;padding:12px 14px;display:flex}.lesson-page__empty-kicker[data-v-18feb1b6]{background:color-mix(in srgb,var(--color-primary) 12%,transparent);width:fit-content;color:var(--color-primary);letter-spacing:.06em;text-transform:uppercase;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:700;display:inline-flex}.lesson-page__empty-title[data-v-18feb1b6]{margin:0;font-size:clamp(18px,2vw,22px);line-height:1.1}.lesson-page__empty-text[data-v-18feb1b6]{max-width:640px;color:var(--color-card-muted);margin:0;font-size:14px;line-height:1.45}@media (width>=721px) and (width<=1280px){.lesson-page__reading-tools-desktop[data-v-18feb1b6]{align-items:flex-start}.lesson-page__reading-toggles[data-v-18feb1b6]{flex-basis:100%;justify-content:flex-start;align-self:flex-start;width:100%;margin-left:0;display:flex}}@media (width<=720px){.head-top[data-v-18feb1b6]{flex-direction:column}.lesson-page__head-main[data-v-18feb1b6]{gap:12px;width:100%}.lesson-page__header-cover[data-v-18feb1b6]{display:none}.lesson-page__order-chip[data-v-18feb1b6]{letter-spacing:.08em;text-transform:uppercase;background:#7878871f;border:0;border-radius:999px;order:-1;align-self:flex-start;min-width:0;padding:6px 10px;font-size:11px;font-weight:800}.article[data-v-18feb1b6]{padding:20px 18px}.lesson-page__reading-tools[data-v-18feb1b6]{margin-bottom:10px}.lesson-page__reading-tools-desktop[data-v-18feb1b6]{display:none}.lesson-page__reading-tools-mobile[data-v-18feb1b6]{justify-content:flex-start;display:flex}.lesson-page__reading-toggle[data-v-18feb1b6],.lesson-page__reading-toggles[data-v-18feb1b6],.lesson-page__reading-tools-group[data-v-18feb1b6]{width:100%}.lesson-page__reading-toggles[data-v-18feb1b6]{gap:10px;margin-left:0}.lesson-page__reading-tools-group[data-v-18feb1b6]{flex-wrap:nowrap;align-items:center;gap:10px}.lesson-page__reading-tools-label[data-v-18feb1b6]{flex:none}.lesson-page__reading-select[data-v-18feb1b6]{flex:auto;width:auto;min-width:0}.lesson-page__reading-toggle[data-v-18feb1b6]{justify-content:space-between}.lesson-page__reading-toggle--desktop-only[data-v-18feb1b6]{display:none}.lesson-page__article-body[data-v-18feb1b6] li,.lesson-page__article-body[data-v-18feb1b6] p{font-size:var(--lesson-reading-font-size);line-height:var(--lesson-reading-line-height)}.lesson-page__article-body[data-v-18feb1b6]{--lesson-reading-max-width:100%}.lesson-page__article-body[data-v-18feb1b6] h1{font-size:clamp(28px,9vw,36px)}.lesson-page__article-body[data-v-18feb1b6] h2{font-size:clamp(24px,7.2vw,30px)}.lesson-page__utility-actions[data-v-18feb1b6]{justify-content:space-between;align-items:center}.lesson-page__utility-primary-actions[data-v-18feb1b6]{min-width:0;display:grid}.lesson-page__report-action[data-v-18feb1b6]{flex:none;inline-size:2.25rem;min-inline-size:2.25rem;padding-inline:0}.lesson-page__report-action[data-v-18feb1b6] .p-button-label{display:none}}