.breadcrumb{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:24px;font-size:.86rem;color:var(--ink-soft)}.breadcrumb a{color:var(--ink-soft);font-weight:600;transition:color .18s var(--ease)}.breadcrumb a:hover{color:var(--lead-deep)}.breadcrumb__sep{color:var(--mute);font-size:.8rem;-webkit-user-select:none;user-select:none}.breadcrumb__current{color:var(--ink);font-weight:600}.course-hero{background:var(--panel);border-radius:var(--r-xl);box-shadow:var(--shadow),inset 0 0 0 1px var(--edge);padding:28px;margin-bottom:32px}.course-hero__top{display:flex;align-items:flex-start;gap:18px;margin-bottom:18px}.course-hero__ic{width:64px;height:64px;flex:none;border-radius:18px;display:grid;place-items:center;color:#fff;background:linear-gradient(150deg,var(--lead-from),var(--lead-deep));box-shadow:0 12px 26px -12px rgba(var(--lead-rgb),.45)}.course-hero__ic svg{width:30px;height:30px}.course-hero__info{min-width:0;flex:1}.course-hero__info h1{font-size:clamp(1.55rem,1.2rem + 1.4vw,2.1rem);margin-bottom:10px}.course-hero__tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:0}.course-hero__bar{margin-bottom:14px}.course-hero__bar .b{height:10px;border-radius:999px;background:rgba(var(--lead-rgb),.12);overflow:hidden}.course-hero__bar .f{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--lead),var(--lead-from));transition:width 1.1s var(--ease)}.course-hero__bar small{display:block;margin-top:7px;font-size:.82rem;color:var(--ink-soft)}.course-hero__author{display:flex;align-items:center;gap:12px;margin-bottom:18px;padding:11px 14px;border-radius:var(--r-md);background:var(--bg);box-shadow:inset 0 0 0 1px var(--edge);width:fit-content}.course-hero__author .ava{width:38px;height:38px;flex:none;border-radius:50%;display:grid;place-items:center;background:var(--lead);color:var(--on-lead);font-family:Literata,serif;font-weight:600;font-size:.98rem}.course-hero__author.author--locked .ava{background:var(--mute);color:var(--ink-soft)}.course-hero__author .who{display:flex;flex-direction:column;gap:1px}.course-hero__author .who .r{font-size:.7rem;font-weight:600;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.04em;line-height:1}.course-hero__author .who .nm{font-weight:700;font-size:.96rem;color:var(--ink);line-height:1.2}.course-hero__author .who .spec{font-size:.78rem;color:var(--ink-soft);line-height:1.2;margin-top:1px}.trail-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px}.trail-head h2{font-size:1.34rem}.trail-head .hint{font-size:.82rem;color:var(--ink-soft)}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 296px;gap:28px;max-width:1060px;margin:0 auto;padding:34px clamp(16px,4vw,40px) 80px}.lesson-video{position:relative;border-radius:var(--r-lg);background:var(--ink);aspect-ratio:16/9;overflow:hidden;margin-bottom:30px}.lesson-video__inner{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:#fffc}.lesson-video__play{width:64px;height:64px;border-radius:50%;background:#ffffff2e;border:0;display:grid;place-items:center;color:#fff;cursor:pointer;box-shadow:0 0 0 6px #ffffff14;transition:background .2s var(--ease),transform .18s var(--ease)}.lesson-video__play:hover{background:#ffffff47;transform:scale(1.06)}.lesson-video__play svg{width:28px;height:28px}.lesson-video__label{font-size:.88rem;font-weight:600}.lesson-video:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse at 50% 30%,rgba(var(--lead-rgb),.18) 0%,transparent 65%);pointer-events:none}.lesson-prose{--rsize: 1.06rem;font-family:Literata,Georgia,serif;font-size:var(--rsize);line-height:1.78;color:var(--ink);max-width:68ch;text-wrap:pretty;margin-bottom:32px}.lesson-prose>p{margin:0 0 1.25em}.lesson-prose h2{font-size:1.18rem;margin:1.6em 0 .5em}.lesson-checklist{margin-bottom:30px;padding:20px 22px;background:var(--surface-hi);border-radius:var(--r-lg);box-shadow:inset 0 0 0 1px var(--edge)}.lesson-checklist h3{font-size:1.08rem;margin-bottom:12px}.lesson-checklist ol{margin:0;padding:0 0 0 1.2em;display:flex;flex-direction:column;gap:7px}.lesson-checklist li{font-size:.96rem;color:var(--ink);line-height:1.55}.lesson-checklist li::marker{color:var(--lead);font-weight:700}.lesson-materials{margin-bottom:30px;padding:20px 22px;background:var(--surface-hi);border-radius:var(--r-lg);box-shadow:inset 0 0 0 1px var(--edge)}.lesson-materials h3{font-size:1.08rem;margin-bottom:12px}.lesson-materials ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px}.lesson-material{display:inline-flex;align-items:center;gap:9px;font-size:.96rem;color:var(--lead-deep);text-decoration:none;font-weight:600}.lesson-material svg{width:18px;height:18px;flex-shrink:0}.lesson-material:hover{text-decoration:underline}.lesson-task{margin-bottom:30px;padding:22px 24px;background:linear-gradient(150deg,rgba(var(--lead-rgb),.06),rgba(var(--lead-rgb),.02));border-radius:var(--r-lg);box-shadow:inset 0 0 0 1.5px rgba(var(--lead-rgb),.18)}.lesson-task__label{display:inline-flex;align-items:center;gap:7px;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--lead-deep);margin-bottom:10px}.lesson-task__label svg{width:15px;height:15px}.lesson-task h3{font-size:1.08rem;margin-bottom:10px}.lesson-task p{margin:0;color:var(--ink-soft);font-size:.96rem;line-height:1.6}.lesson-submit{margin-bottom:30px;padding:24px;background:var(--panel);border-radius:var(--r-xl);box-shadow:var(--shadow),inset 0 0 0 1px var(--edge)}.lesson-submit h3{font-size:1.08rem;margin-bottom:6px}.lesson-submit__privacy{display:flex;align-items:center;gap:7px;font-size:.82rem;color:var(--ink-soft);margin-bottom:16px}.lesson-submit__privacy svg{width:15px;height:15px;color:var(--accent-deep);flex:none}.lesson-submit__area{width:100%;font:inherit;color:var(--ink);min-height:130px;resize:vertical;padding:14px 16px;border:0;border-radius:var(--r-md);background:var(--surface-hi);box-shadow:inset 0 0 0 1px var(--edge);line-height:1.6;font-size:.96rem;transition:box-shadow .18s var(--ease)}.lesson-submit__area::placeholder{color:var(--ink-soft);opacity:.65}.lesson-submit__area:focus{outline:none;box-shadow:inset 0 0 0 2px 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var(--lead)}.mini-node{width:26px;height:26px;border-radius:50%;flex:none;display:grid;place-items:center;font-size:.74rem;font-weight:800}.mini-node--done{background:var(--accent);color:#fff}.mini-node--now{background:var(--lead);color:var(--on-lead)}.mini-node--next,.mini-node--lock{background:var(--bg);color:var(--ink-soft);box-shadow:inset 0 0 0 1.5px var(--mute)}.mini-node svg{width:13px;height:13px}.mini-step__t{font-size:.84rem;font-weight:600;color:var(--ink);line-height:1.3}.mini-step__t--soft{color:var(--ink-soft)}.course-hero__ic--locked{background:linear-gradient(150deg,var(--mute),rgba(var(--mute-rgb),.55));color:var(--ink-soft);box-shadow:none}.course-locked-desc{margin:0 0 28px;color:var(--ink-soft);font-size:.96rem;line-height:1.65;max-width:58ch}.course-program{margin-bottom:28px}.course-program h2{font-size:1.16rem;margin-bottom:14px}.course-program__list{display:flex;flex-direction:column;gap:6px;margin:0;padding:0;list-style:none}.course-program__item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:var(--r-md);background:var(--panel);box-shadow:inset 0 0 0 1px var(--edge)}.course-program__item .pi-num{width:24px;height:24px;flex:none;border-radius:50%;display:grid;place-items:center;font-size:.7rem;font-weight:800;background:var(--bg);color:var(--ink-soft);box-shadow:inset 0 0 0 1.5px var(--mute)}.course-program__item .pi-t{font-size:.92rem;font-weight:600;color:var(--ink)}.ink-cta{background:var(--panel);border-radius:var(--r-xl);box-shadow:var(--shadow),inset 0 0 0 1px var(--edge);padding:24px 26px;margin-top:8px}.ink-cta__note{display:flex;align-items:flex-start;gap:10px;margin:0 0 18px;padding:14px 16px;border-radius:var(--r-md);background:var(--bg);box-shadow:inset 0 0 0 1px var(--edge);font-size:.88rem;color:var(--ink-soft);line-height:1.55}.ink-cta__note svg{width:17px;height:17px;color:var(--lead);flex:none;margin-top:1px}.ink-cta__foot{display:flex;align-items:center;gap:14px;flex-wrap:wrap}@media(max-width:920px){.lesson-layout{grid-template-columns:1fr;padding-bottom:104px;gap:22px}.lesson-rail{order:2}.lesson-prose{max-width:100%}.course-hero__top{flex-wrap:wrap;gap:14px}}@media(max-width:600px){.lesson-submit__foot{flex-direction:column;align-items:stretch}.lesson-submit__foot .btn{justify-content:center}.lesson-nav{flex-direction:column}.lesson-nav a,.lesson-nav .btn{width:100%;justify-content:center}}@media(prefers-reduced-motion:no-preference){.course-hero{animation:rise .5s var(--ease) both}.trail-head{animation:rise .5s var(--ease) both;animation-delay:.06s}.lesson-video{animation:rise .5s var(--ease) both}.lesson-prose{animation:rise .5s var(--ease) both;animation-delay:.08s}.lesson-task{animation:rise .5s var(--ease) both;animation-delay:.12s}.lesson-submit{animation:rise .5s var(--ease) both;animation-delay:.16s}.review-status{animation:rise .5s var(--ease) both;animation-delay:.06s}.lesson-video__play{transition:background .2s var(--ease),transform .18s var(--ease)}}@media(prefers-reduced-motion:reduce){.course-hero,.trail-head,.lesson-video,.lesson-prose,.lesson-task,.lesson-submit,.review-status{animation:none}.lesson-submit__area,.lesson-submit__attach,.lesson-video__play,.mini-step,.lesson-nav__back{transition:none}}