/* learn.css: worker learning experience (dashboard, module, steps, quizzes, certificate). All classes prefixed ln-. */
:root { --ln-ease: cubic-bezier(.2, .8, .2, 1); --ln-r: 20px; }
.ln-ic { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ln-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ln-kicker { font-size: .82rem; font-weight: 600; color: var(--muted); letter-spacing: 0; margin: 0; }
.ln-kicker-accent { color: var(--accent-fg); }
.ln-muted { color: var(--muted); }
.ln-lead { font-size: 1.1rem; line-height: 1.55; color: var(--muted); max-width: 60ch; }
.ln-h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); letter-spacing: -.025em; line-height: 1.12; }
.ln-h3 { font-size: 1.1rem; letter-spacing: -.01em; }
.ln-btn-lg { padding: 13px 24px; font-size: 1rem; min-height: 48px; }
.ln-btn-lg .ln-ic, .ln-cert-acts .ln-ic { width: 18px; height: 18px; }
#app .btn:focus-visible, .ln-rail button:focus-visible, .ln-opt:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

/* progress bars */
.ln-bar { position: relative; display: block; height: 6px; border-radius: 99px; background: color-mix(in srgb, var(--fg) 8%, transparent); overflow: hidden; flex: 1; min-width: 40px; }
.ln-bar > span { position: absolute; inset: 0 auto 0 0; border-radius: inherit; background: var(--accent); transform-origin: left; animation: ln-grow .9s var(--ln-ease) both; }
.ln-bar-sm { height: 4px; }
@keyframes ln-grow { from { transform: scaleX(0); } }

/* ring */
.ln-ring, .ln-res-ring { position: relative; width: 168px; aspect-ratio: 1; flex: none; }
.ln-ring svg, .ln-res-ring svg { width: 100%; height: 100%; display: block; }
.ln-ring-track { fill: none; stroke: color-mix(in srgb, var(--fg) 8%, transparent); stroke-width: 9; }
.ln-ring-val { fill: none; stroke: var(--accent); stroke-width: 9; stroke-linecap: round; animation: ln-ring 1.4s .15s var(--ln-ease) both; }
@keyframes ln-ring { from { stroke-dashoffset: var(--len); } to { stroke-dashoffset: var(--off); } }
.ln-ring-in { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 2px; }
.ln-ring-in b { font-size: 2.1rem; font-weight: 600; letter-spacing: -.03em; line-height: 1; }
.ln-ring-in span { font-size: .78rem; color: var(--muted); }

/* ---------- Dashboard ---------- */
.ln-dash > * + * { margin-top: 28px; }
.ln-hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 40px; align-items: center; }
.ln-hero-txt { display: contents; }
.ln-hero-txt > * { grid-column: 1; }
.ln-hero h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.035em; line-height: 1.05; margin-top: 8px; }
.ln-hero .ln-lead { margin-top: 12px; }
.ln-hero .ln-ring { grid-column: 2; grid-row: 1 / span 4; }
.ln-stats { list-style: none; padding: 0; margin: 20px 0 0; display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: .95rem; }
.ln-stats li { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.ln-stats b { color: var(--fg); font-weight: 600; }
.ln-stat-ic { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; flex: none; }
.ln-stat-ic .ln-ic { width: 15px; height: 15px; stroke-width: 2.2; }
.s-done.ln-stat-ic { background: var(--good-soft); color: var(--good); }
.s-prog.ln-stat-ic { background: var(--accent-soft); color: var(--accent-fg); }
.s-late.ln-stat-ic { background: var(--bad-soft); color: var(--bad); }
.s-todo.ln-stat-ic { background: var(--surface-2); color: var(--muted); }

.ln-cont { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 32px; align-items: center; background: var(--surface); border-radius: 24px; padding: 20px 32px 20px 20px; box-shadow: var(--shadow); }
.ln-cont-media { border-radius: 16px; overflow: hidden; background: var(--surface-2); }
.ln-cont-media img { display: block; width: 100%; aspect-ratio: 1200 / 440; object-fit: cover; }
.ln-cont h2 { font-size: clamp(1.35rem, 2.6vw, 1.75rem); letter-spacing: -.02em; line-height: 1.2; margin-top: 6px; }
.ln-cont .ln-muted { margin-top: 8px; }
.ln-chips { list-style: none; padding: 0; margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.ln-chips li { font-size: .8rem; font-weight: 500; padding: 4px 10px; border-radius: 99px; background: var(--surface-2); color: var(--muted); }
.ln-chips li.is-late { background: var(--bad-soft); color: var(--bad); }
.ln-cont-prog { display: flex; align-items: center; gap: 12px; margin-top: 16px; font-size: .85rem; color: var(--muted); white-space: nowrap; }
.ln-cont .btn { margin-top: 18px; }
.ln-alldone { display: flex; gap: 16px; align-items: center; padding: 22px 24px; border-radius: 20px; background: var(--good-soft); }
.ln-alldone h2 { font-size: 1.15rem; }
.ln-alldone .ln-stat-ic { width: 44px; height: 44px; background: var(--surface); }

.ln-group { padding-top: 12px; }
.ln-group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.ln-group-head h2 { font-size: 1.4rem; letter-spacing: -.02em; }
.ln-group-count { display: inline-flex; align-items: center; gap: 6px; font-size: .86rem; color: var(--muted); }
.ln-group-count .ln-bar { width: 72px; flex: none; margin-left: 6px; }
.ln-cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); }
.ln-card { position: relative; display: flex; flex-direction: column; gap: 10px; padding: 18px; border-radius: 18px; background: var(--surface); box-shadow: 0 0 0 1px var(--line); transition: box-shadow .2s, transform .2s var(--ln-ease); min-width: 0; }
.ln-card:hover { box-shadow: 0 0 0 1px var(--line), 0 8px 24px rgba(0,0,0,.06); transform: translateY(-1px); }
.ln-card.is-next { box-shadow: 0 0 0 2px var(--accent), 0 8px 24px rgba(10,102,216,.10); }
.ln-card.is-late { box-shadow: 0 0 0 1px color-mix(in srgb, var(--bad) 35%, var(--line)); }
.ln-card.is-done { background: var(--surface-2); box-shadow: none; }
.ln-card-top { display: flex; align-items: center; gap: 10px; }
.ln-card-n { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-size: .82rem; font-weight: 600; font-variant-numeric: tabular-nums; background: var(--surface-2); color: var(--muted); flex: none; }
.ln-card.is-next .ln-card-n, .ln-card.is-prog .ln-card-n { background: var(--accent-soft); color: var(--accent-fg); }
.ln-card.is-done .ln-card-n { background: var(--good-soft); color: var(--good); }
.ln-card.is-late .ln-card-n { background: var(--bad-soft); color: var(--bad); }
.ln-card-meta { font-size: .8rem; color: var(--muted); }
.ln-card h3 { font-size: 1.02rem; font-weight: 600; line-height: 1.3; letter-spacing: -.01em; }
.ln-card .ln-bar { flex: none; }
.ln-card-foot { margin-top: auto; padding-top: 4px; display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.ln-status { display: inline-flex; align-items: center; gap: 6px; font-size: .8rem; font-weight: 500; color: var(--muted); min-width: 0; }
.ln-status .ln-ic { width: 15px; height: 15px; }
.ln-status.s-done { color: var(--good); }
.ln-status.s-late { color: var(--bad); }
.ln-status.s-prog { color: var(--accent-fg); }
.ln-card-acts { display: flex; gap: 4px; margin-left: auto; }
.ln-card-acts .btn { min-height: 36px; }

/* ---------- Course layout + rail ---------- */
.ln-back { margin-left: -8px; }
.ln-back .ln-ic { width: 16px; height: 16px; }
.course.ln-course { grid-template-columns: 290px minmax(0, 1fr); gap: 24px; margin-top: 12px; }
.ln-rail { position: sticky; top: calc(76px + env(safe-area-inset-top, 0px)); background: var(--surface); border-radius: 22px; box-shadow: var(--shadow); padding: 18px 12px 12px; min-width: 0; }
.ln-rail-head { padding: 0 8px 12px; display: grid; gap: 2px; }
.ln-rail-k { font-size: .78rem; color: var(--muted); font-weight: 500; }
.ln-rail-t { font-weight: 600; font-size: .98rem; line-height: 1.3; }
.ln-rail-p { display: flex; align-items: center; gap: 10px; margin-top: 10px; font-size: .76rem; color: var(--muted); white-space: nowrap; }
.ln-rail ol { list-style: none; margin: 0; padding: 0; position: relative; }
.ln-rail li { position: relative; }
.ln-rail li + li::before { content: ""; position: absolute; left: 24px; top: -10px; height: 20px; width: 2px; border-radius: 2px; background: var(--line); }
.ln-rail li.is-done + li::before { background: var(--accent); }
.ln-rail button { width: 100%; display: grid; grid-template-columns: 28px 1fr; gap: 12px; align-items: center; text-align: left; padding: 10px; border: 0; border-radius: 14px; background: transparent; color: inherit; cursor: pointer; font: inherit; position: relative; z-index: 1; }
.ln-rail button:hover:not(:disabled) { background: var(--surface-2); }
.ln-rail button[aria-current="step"] { background: var(--accent-soft); }
.ln-rail button:disabled { cursor: not-allowed; }
.ln-rail .is-locked .ln-rail-txt { opacity: .55; }
.ln-dot { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: .78rem; font-weight: 600; font-variant-numeric: tabular-nums; background: var(--surface); box-shadow: inset 0 0 0 2px var(--line); color: var(--muted); transition: background .3s, box-shadow .3s; }
.ln-dot .ln-ic { width: 14px; height: 14px; stroke-width: 2.6; }
.is-done .ln-dot { background: var(--accent); box-shadow: none; color: #fff; }
.is-done .ln-dot path { stroke-dasharray: 24; stroke-dashoffset: 0; animation: ln-draw .5s .1s var(--ln-ease) both; }
@keyframes ln-draw { from { stroke-dashoffset: 24; } }
.is-cur .ln-dot { box-shadow: inset 0 0 0 2px var(--accent), 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent-fg); }
.is-cur.is-done .ln-dot { box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); color: #fff; }
.is-locked .ln-dot { background: var(--surface-2); box-shadow: none; }
.is-locked .ln-dot .ln-ic { width: 13px; height: 13px; stroke-width: 2; }
.ln-rail-txt { display: grid; min-width: 0; }
.ln-rail .st-title { font-weight: 600; font-size: .92rem; line-height: 1.3; }
.ln-rail .st-kind { font-size: .76rem; color: var(--muted); margin-top: 1px; }

.lesson.ln-main { border-radius: 24px; min-width: 0; }
.ln-main .lesson-body { padding: clamp(22px, 4vw, 44px) clamp(18px, 4.5vw, 52px); }
.ln-main .lesson-body p, .ln-main .lesson-body li { max-width: 70ch; }
.ln-main .lesson-body { font-size: 1.04rem; line-height: 1.62; }
.ln-main .lesson-body > h2, .ln-main #qa > h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); letter-spacing: -.025em; line-height: 1.15; margin-top: 6px; }
.ln-foot.lesson-foot { padding: 16px clamp(18px, 4.5vw, 52px); position: sticky; bottom: 0; z-index: 3; background: color-mix(in srgb, var(--surface-2) 88%, transparent); backdrop-filter: saturate(1.6) blur(14px); -webkit-backdrop-filter: saturate(1.6) blur(14px); border-top: 1px solid color-mix(in srgb, var(--line) 70%, transparent); }
.ln-foot .btn { min-height: 44px; }
.ln-foot-acts { gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.ln-answered { display: inline-flex; align-items: center; gap: 10px; }
.ln-answered .ln-bar { width: 80px; flex: none; }
.ln-foot-p { display: inline-flex; align-items: center; gap: 10px; }
.ln-foot-p .ln-bar { width: 90px; flex: none; }
.ln-final-img { display: block; width: 100%; }
.ln-k-ivideo .lesson-body { padding-bottom: 8px; }

/* module overview */
.ln-ov-head { position: relative; overflow: hidden; margin: 12px 12px 0; padding: clamp(26px, 5vw, 48px) clamp(18px, 4vw, 40px); border-radius: 18px; background: radial-gradient(120% 140% at 100% 0%, color-mix(in srgb, var(--accent) 14%, #fff) 0%, color-mix(in srgb, var(--accent) 5%, #fff) 45%, var(--surface-2) 100%); }
.ln-ov-head > p, .ln-ov-head > h1 { position: relative; z-index: 1; }
.ln-ov-head .ln-h1 { margin-top: 8px; max-width: 18ch; }
.ln-ov-head .ln-lead { margin-top: 12px; position: relative; z-index: 1; max-width: 46ch; }
.ln-ov-num { position: absolute; right: clamp(14px, 4vw, 44px); top: 50%; transform: translateY(-50%); font-size: clamp(7rem, 18vw, 12rem); font-weight: 700; letter-spacing: -.06em; line-height: 1; color: color-mix(in srgb, var(--accent) 12%, transparent); font-variant-numeric: tabular-nums; pointer-events: none; }
.ln-ov-art { position: absolute; inset: 0; width: 100%; height: 100%; fill: none; stroke: var(--accent); stroke-width: 1.5; opacity: .22; pointer-events: none; }
.ln-ov-art path { stroke-dasharray: 520; animation: ln-path 2.2s .1s var(--ln-ease) both; }
.ln-ov-art path + path { animation-delay: .35s; opacity: .6; }
@keyframes ln-path { from { stroke-dashoffset: 520; } to { stroke-dashoffset: 0; } }
.ln-ov-body.lesson-body > * + * { margin-top: 0; }
.ln-ov-body.lesson-body { padding-top: clamp(20px, 3vw, 32px); }
.ln-facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin: 0; padding: 4px 0; border-radius: 16px; background: var(--surface-2); }
.ln-facts > div { padding: 12px 16px; }
.ln-facts > div + div { border-left: 1px solid var(--line); }
.ln-facts dt { font-size: .78rem; color: var(--muted); font-weight: 500; }
.ln-facts dd { margin: 2px 0 0; font-size: 1.12rem; font-weight: 600; letter-spacing: -.01em; }
.ln-facts .is-late dt, .ln-facts .is-late dd { color: var(--bad); }
.ln-main .lesson-body .ln-h3 { font-size: 1.15rem; letter-spacing: -.01em; margin-top: 32px; }
.ln-how { list-style: none; padding: 0 !important; margin: 14px 0 22px; display: grid; gap: 4px; }
.ln-how li { display: flex; gap: 14px; align-items: flex-start; padding: 10px 0; max-width: none !important; margin: 0 !important; }
.ln-how-ic { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-fg); flex: none; }
.ln-how b { display: block; font-weight: 600; }
.ln-how span:not(.ln-how-ic) { color: var(--muted); font-size: .96rem; line-height: 1.5; }

/* ---------- Questions ---------- */
.ln-q.q { margin-top: 18px; padding: clamp(16px, 3vw, 24px); border-radius: 20px; background: var(--surface-2); transition: background .3s; }
.ln-q .q-n { font-size: .8rem; color: var(--muted); font-weight: 500; }
.ln-q .q-text { font-size: 1.08rem; font-weight: 600; line-height: 1.4; margin: 6px 0 14px; max-width: 62ch; }
.ln-opts.opts { gap: 10px; }
.ln-opts.ok-row { gap: 10px; }
.ln-opt.opt { min-height: 56px; align-items: center; gap: 14px; padding: 13px 16px; border-radius: 16px; border: 1.5px solid transparent; background: var(--surface); box-shadow: 0 0 0 1px var(--line); font: inherit; font-size: 1rem; line-height: 1.4; color: var(--fg); transition: box-shadow .2s, background .2s, transform .12s var(--ln-ease), opacity .2s; -webkit-tap-highlight-color: transparent; }
.ln-opt.opt:hover:not(:disabled) { box-shadow: 0 0 0 1.5px var(--accent); border-color: transparent; }
.ln-opt.opt:active:not(:disabled) { transform: scale(.985); }
.ln-opt .key { width: 30px; height: 30px; border-radius: 50%; font-size: .82rem; font-weight: 600; background: var(--surface-2); color: var(--muted); transition: background .2s, color .2s; }
.ln-opt-t { flex: 1; min-width: 0; }
.ln-opt.opt[aria-pressed="true"] { border-color: transparent; box-shadow: 0 0 0 2px var(--accent); background: var(--accent-soft); }
.ln-opt.opt[aria-pressed="true"] .key { background: var(--accent); color: #fff; }
.ln-opt.opt.right { border-color: transparent; box-shadow: 0 0 0 2px var(--good); background: var(--good-soft); }
.ln-opt.opt.right .key { background: var(--good); color: #fff; }
.ln-opt.opt.wrong { border-color: transparent; box-shadow: 0 0 0 2px var(--bad); background: var(--bad-soft); }
.ln-opt.opt.wrong .key { background: var(--bad); color: #fff; }
.ln-opt.opt.dim { opacity: .55; }
.ok-row .ln-opt.opt { justify-content: center; font-weight: 600; }
.ln-opt-ic { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; flex: none; color: #fff; }
.right .ln-opt-ic { background: var(--good); }
.wrong .ln-opt-ic { background: var(--bad); }
.ln-opt-ic .ln-ic { width: 15px; height: 15px; stroke-width: 2.6; }
.ln-opt-ic path { stroke-dasharray: 26; animation: ln-draw .45s var(--ln-ease) both; }
.ln-fb.fb { display: flex; gap: 12px; align-items: flex-start; margin-top: 14px; padding: 14px 16px; border-radius: 16px; font-size: .96rem; line-height: 1.5; background: var(--surface); animation: ln-in .35s var(--ln-ease) both; }
.ln-fb.good { box-shadow: inset 3px 0 0 var(--good); }
.ln-fb.bad { box-shadow: inset 3px 0 0 var(--bad); }
.ln-fb strong { font-weight: 600; }
.ln-fb.good strong { color: var(--good); } .ln-fb.bad strong { color: var(--bad); }
.ln-fb p { margin: 4px 0 0; }
.ln-fb-ic { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; flex: none; color: #fff; }
.good .ln-fb-ic, .is-right > .ln-fb-ic { background: var(--good); }
.bad .ln-fb-ic, .is-wrong > .ln-fb-ic { background: var(--bad); }
.ln-fb-ic .ln-ic { width: 14px; height: 14px; stroke-width: 2.6; }
@keyframes ln-in { from { opacity: 0; transform: translateY(6px); } }

/* result */
.ln-result { display: flex; align-items: center; gap: clamp(18px, 4vw, 36px); padding: clamp(20px, 4vw, 32px); border-radius: 24px; background: var(--surface-2); }
.ln-result.is-pass { background: linear-gradient(135deg, var(--good-soft), color-mix(in srgb, var(--good-soft) 40%, var(--surface))); }
.ln-result.is-pass .ln-ring-val { stroke: var(--good); }
.ln-result.is-fail .ln-ring-val { stroke: var(--warn); }
.ln-res-ring { width: 150px; }
.ln-res-ring .ln-ring-in b { font-size: 1.9rem; }
.ln-ray { stroke: var(--good); stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 8; stroke-dashoffset: 8; animation: ln-ray .5s calc(1.1s + var(--d)) var(--ln-ease) forwards; opacity: .7; }
@keyframes ln-ray { to { stroke-dashoffset: 0; } }
.ln-result-txt h2 { font-size: clamp(1.45rem, 3.4vw, 1.9rem); letter-spacing: -.025em; line-height: 1.15; margin-top: 4px; }
.ln-result-txt .ln-muted { margin-top: 8px; max-width: 52ch; }
.ln-review-h { margin-top: 32px !important; }
.ln-review { list-style: none; padding: 0 !important; margin: 12px 0 0; display: grid; gap: 10px; }
.ln-review li { display: flex; gap: 14px; align-items: flex-start; padding: 16px; border-radius: 16px; background: var(--surface-2); max-width: none !important; margin: 0 !important; }
.ln-review .q-n { font-size: .78rem; color: var(--muted); }
.ln-review-q { font-weight: 600; line-height: 1.4; margin-top: 2px; }
.ln-review p { margin: 6px 0 0; font-size: .95rem; color: var(--muted); }
.ln-review p b { color: var(--fg); font-weight: 600; }

/* ---------- Certificate ---------- */
.ln-cert-note { display: flex; align-items: center; gap: 10px; margin-top: 12px; padding: 12px 16px; border-radius: 14px; background: var(--good-soft); color: var(--fg); font-size: .92rem; }
.ln-cert-note .ln-ic { color: var(--good); width: 20px; height: 20px; }
.ln-cert-stage { margin-top: 16px; }
.cert.ln-cert { max-width: 1000px; margin: 0 auto; padding: clamp(10px, 1.8vw, 18px); text-align: center; border-radius: 6px; background: #FFFEFB; box-shadow: 0 1px 2px rgba(0,0,0,.06), 0 12px 40px rgba(0,0,0,.08), 0 40px 80px -20px rgba(0,0,0,.10); }
.cert.ln-cert::before { display: none; }
.ln-cert-frame { position: relative; border: 1.5px solid color-mix(in srgb, var(--accent) 55%, #fff); outline: 1px solid color-mix(in srgb, var(--accent) 25%, #fff); outline-offset: -8px; padding: clamp(28px, 6vw, 64px) clamp(18px, 6vw, 72px) clamp(24px, 4vw, 40px); }
.ln-cert-corner { position: absolute; width: clamp(34px, 6vw, 56px); height: auto; fill: none; stroke: var(--accent); stroke-width: 1.5; opacity: .7; }
.ln-cert-corner circle { fill: var(--accent); stroke: none; }
.ln-cert-corner path { stroke-dasharray: 120; animation: ln-cdraw 1.6s .2s var(--ln-ease) both; }
@keyframes ln-cdraw { from { stroke-dashoffset: 120; } to { stroke-dashoffset: 0; } }
.ln-cert-corner:nth-of-type(1) { top: 14px; left: 14px; }
.ln-cert-corner:nth-of-type(2) { top: 14px; right: 14px; transform: scaleX(-1); }
.ln-cert-corner:nth-of-type(3) { bottom: 14px; left: 14px; transform: scaleY(-1); }
.ln-cert-corner:nth-of-type(4) { bottom: 14px; right: 14px; transform: scale(-1); }
.ln-cert-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: .95rem; letter-spacing: -.01em; }
.ln-cert-mark { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; background: var(--accent); }
.ln-cert-mark svg { width: 16px; height: 16px; fill: none; stroke: #fff; stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.ln-cert-title { margin-top: clamp(18px, 3vw, 28px); font-size: clamp(.82rem, 1.6vw, 1rem); font-weight: 600; letter-spacing: .28em; text-transform: uppercase; color: var(--accent-fg); }
.ln-cert-pre { margin-top: clamp(14px, 2.4vw, 22px); color: var(--muted); font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif; font-style: italic; font-size: clamp(1rem, 1.8vw, 1.15rem); }
.cert .ln-cert-name { margin: 6px auto 0; font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif; font-weight: 400; font-size: clamp(2.1rem, 6.4vw, 3.6rem); letter-spacing: -.01em; line-height: 1.1; color: var(--fg); padding-bottom: 10px; border-bottom: 1px solid var(--line); display: inline-block; min-width: min(100%, 420px); }
.ln-cert-mod { margin: 8px auto 0; font-size: clamp(1.15rem, 2.6vw, 1.5rem); font-weight: 600; letter-spacing: -.02em; line-height: 1.3; max-width: 30ch; }
.ln-cert-sub { margin-top: 8px; font-size: .9rem; color: var(--muted); }
.ln-cert-row { display: flex; align-items: center; justify-content: center; gap: clamp(20px, 5vw, 48px); margin-top: clamp(22px, 4vw, 36px); flex-wrap: wrap; }
.ln-cert-meta { display: grid; grid-template-columns: repeat(2, auto); gap: 14px 36px; margin: 0; text-align: left; }
.ln-cert-meta dt { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.ln-cert-meta dd { margin: 2px 0 0; font-size: .95rem; font-weight: 500; }
.ln-cert-seal { width: 112px; flex: none; color: var(--accent); }
.ln-cert-seal svg { display: block; width: 100%; height: auto; }
.ln-cert-seal .s1 { fill: color-mix(in srgb, var(--accent) 8%, #fff); stroke: var(--accent); stroke-width: 1.5; }
.ln-cert-seal .s2 { fill: none; stroke: var(--accent); stroke-width: 1; stroke-dasharray: 2 3; }
.ln-cert-seal .s-txt { font-size: 9px; font-weight: 600; fill: var(--accent-fg); }
.ln-cert-seal .s-ck { fill: none; stroke: var(--accent); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 50; animation: ln-cdraw2 .8s 1s var(--ln-ease) both; }
@keyframes ln-cdraw2 { from { stroke-dashoffset: 50; } to { stroke-dashoffset: 0; } }
.ln-cert-sig { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 6vw, 80px); max-width: 640px; margin: clamp(26px, 4vw, 40px) auto 0; }
.ln-cert-sig > div { display: grid; gap: 2px; font-size: .9rem; }
.ln-cert-line { display: block; height: 1px; background: color-mix(in srgb, var(--fg) 35%, transparent); margin-bottom: 10px; }
.ln-cert-sig span:last-child { font-size: .78rem; color: var(--muted); }
.ln-cert-fine { margin: clamp(20px, 3vw, 30px) auto 0; font-size: .78rem; color: var(--muted); max-width: 60ch; }
.ln-cert-acts { margin-top: 20px; justify-content: space-between; gap: 10px; max-width: 1000px; margin-inline: auto; }

/* ---------- Mobile ---------- */
@media (max-width: 900px) {
  .course.ln-course { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .ln-rail { position: static; padding: 14px 14px 12px; border-radius: 20px; }
  .ln-rail-head { padding: 0 2px 12px; grid-template-columns: 1fr auto; align-items: end; column-gap: 12px; }
  .ln-rail-k { grid-column: 1; }
  .ln-rail-t { grid-column: 1; }
  .ln-rail-p { grid-column: 2; grid-row: 1 / span 2; margin-top: 0; }
  .ln-rail-p .ln-bar { display: none; }
  .ln-rail ol { display: flex; overflow-x: auto; scrollbar-width: none; padding: 4px 2px; }
  .ln-rail ol::-webkit-scrollbar { display: none; }
  .ln-rail li { flex: 1 0 auto; display: flex; justify-content: center; min-width: 40px; }
  .ln-rail li + li::before { left: auto; right: calc(50% + 18px); top: 50%; height: 2px; width: calc(100% - 36px); }
  .ln-rail button { grid-template-columns: 28px; padding: 6px; width: auto; border-radius: 50%; }
  .ln-rail button[aria-current="step"] { background: transparent; }
  .ln-rail-txt { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .ln-cont { grid-template-columns: 1fr; gap: 18px; padding: 12px 12px 22px; }
  .ln-cont-body { padding: 0 8px; }
  .ln-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ln-facts > div:nth-child(3) { border-left: 0; }
  .ln-facts > div:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .ln-hero { grid-template-columns: auto minmax(0, 1fr); column-gap: 18px; }
  .ln-hero-txt > * { grid-column: 1 / -1; }
  .ln-hero .ln-ring { grid-column: 1; grid-row: 4; width: 112px; margin-top: 20px; }
  .ln-hero .ln-ring-in b { font-size: 1.5rem; }
  .ln-hero .ln-ring-in span { font-size: .68rem; max-width: 8ch; margin-inline: auto; }
  .ln-hero .ln-stats { grid-column: 2; grid-row: 4; flex-direction: column; gap: 8px; align-self: center; }
  .ln-hero .ln-lead { font-size: 1.02rem; }
  .ln-cards { grid-template-columns: 1fr; gap: 10px; }
  .ln-card { padding: 16px; }
  .ln-main .lesson-body { font-size: 1rem; }
  .ln-foot.lesson-foot { padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px)); }
  .ln-foot-l { display: none; }
  .ln-foot #foot { flex: 1; display: flex; justify-content: flex-end; }
  .ln-foot-acts { width: 100%; justify-content: space-between; }
  .ln-k-lesson .ln-foot #next, .ln-k-ivideo .ln-foot #next { width: 100%; justify-content: center; }
  .ln-result { flex-direction: column; text-align: center; }
  .ln-result-txt .ln-muted { margin-inline: auto; }
  .ln-review li { padding: 14px; }
  .ln-cert-corner { opacity: .5; }
  .ln-cert-row { flex-direction: column-reverse; gap: 18px; }
  .ln-cert-meta { gap: 12px 20px; }
  .ln-cert-seal { width: 88px; }
  .ln-cert-sig { grid-template-columns: 1fr; max-width: 280px; }
  .ln-cert-acts .btn { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .ln-bar > span, .ln-ring-val, .ln-ray, .ln-ov-art path, .ln-cert-corner path, .ln-cert-seal .s-ck, .is-done .ln-dot path, .ln-opt-ic path, .ln-fb.fb { animation: none !important; }
  .ln-ray { stroke-dashoffset: 0; }
  .ln-card, .ln-opt.opt { transition: none; }
}

/* ---------- Print: certificate on one A4 landscape page ---------- */
@media print {
  @page { size: A4 landscape; margin: 10mm; }
  html, body { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .ln-back, .ln-cert-note, .ln-cert-acts { display: none !important; }
  .ln-cert-stage { margin: 0; }
  .cert.ln-cert { box-shadow: none !important; border: 0 !important; max-width: none; padding: 0; background: #fff; break-inside: avoid; }
  .ln-cert-frame { padding: 34px 60px 26px; }
  .ln-cert-corner path, .ln-cert-seal .s-ck { animation: none !important; stroke-dashoffset: 0 !important; }
  .cert .ln-cert-name { font-size: 44px; }
  .ln-cert-row { flex-direction: row; }
  .ln-cert-sig { grid-template-columns: 1fr 1fr; max-width: 640px; }
}

/* ---------- Certificate QR + public verify page ---------- */
.ln-cert-qr { flex: none; display: grid; justify-items: center; gap: 6px; }
.ln-cert-qr a { display: block; width: 104px; padding: 4px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.ln-cert-qr svg { display: block; width: 100%; height: auto; }
.ln-cert-qr span { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
@media (max-width: 900px) { .ln-cert-qr a { width: 96px; } }
@media print { .ln-cert-qr a { width: 92px; } .ln-cert-fine { margin-top: 16px; } }

.vf { max-width: 680px; margin: clamp(28px, 6vw, 64px) auto; padding: 0 0 40px; }
.vf-kicker { font-size: .78rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-fg); margin: 0; }
.vf h1 { font-size: clamp(1.8rem, 4.6vw, 2.6rem); letter-spacing: -.03em; line-height: 1.1; margin: 8px 0 10px; }
.vf-sub { color: var(--muted); font-size: 1.05rem; line-height: 1.55; margin: 0 0 24px; }
.vf-form { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px; box-shadow: var(--shadow); }
.vf-l { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 8px; }
.vf-row { display: flex; gap: 10px; }
.vf-in { flex: 1; min-width: 0; font: inherit; font-size: 1.05rem; letter-spacing: .06em; text-transform: uppercase; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-2); color: var(--fg); }
.vf-in:focus { outline: 2px solid var(--accent); outline-offset: 1px; background: var(--surface); }
.vf-out { margin-top: 18px; }
.vf-wait { color: var(--muted); }
.vf-card { border: 1px solid var(--line); border-radius: 18px; background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
.vf-st { display: flex; gap: 12px; align-items: flex-start; padding: 16px 18px; }
.vf-st .ln-ic { width: 28px; height: 28px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.vf-st b { display: block; font-size: 1.1rem; }
.vf-st span { display: block; color: var(--muted); font-size: .92rem; margin-top: 2px; }
.vf-card.is-good .vf-st { background: var(--good-soft); color: var(--good); }
.vf-card.is-warn .vf-st { background: var(--warn-soft); color: var(--warn); }
.vf-card.is-bad .vf-st { background: var(--bad-soft); color: var(--bad); }
.vf-card .vf-st b { color: inherit; }
.vf-dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 24px; margin: 0; padding: 18px; }
.vf-dl dt { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.vf-dl dd { margin: 3px 0 0; font-weight: 500; overflow-wrap: anywhere; }
.vf-note { color: var(--muted); font-size: .85rem; line-height: 1.5; margin: 22px 0 16px; }
@media (max-width: 560px) { .vf-row { flex-direction: column; } .vf-row .btn { width: 100%; justify-content: center; } .vf-dl { grid-template-columns: 1fr; } }
.ln-nw { white-space: nowrap; }
@media print {
  .ln-cert-frame { padding: 26px 56px 20px; }
  .ln-cert-title { margin-top: 12px; }
  .ln-cert-pre { margin-top: 10px; }
  .cert .ln-cert-name { font-size: 40px; }
  .ln-cert-row { margin-top: 16px; }
  .ln-cert-sig { margin-top: 18px; }
  .ln-cert-fine { max-width: 90ch; margin-top: 12px; font-size: 10px; }
  .ln-cert-qr a { width: 84px; }
  .ln-cert-seal { width: 96px; }
}

/* ---------- Combined certificate ---------- */
.ln-rec-card { display: flex; align-items: center; gap: 18px; margin: 18px 0; padding: 20px 22px; border-radius: 20px; background: var(--good-soft); border: 1px solid color-mix(in srgb, var(--good) 25%, transparent); }
.ln-rec-ic { width: 52px; height: 52px; flex: none; border-radius: 16px; display: grid; place-items: center; background: #fff; color: var(--good); }
.ln-rec-ic svg { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.ln-rec-txt { flex: 1; min-width: 0; }
.ln-rec-txt h2 { margin: 0 0 4px; font-size: 1.2rem; }
.ln-rec-txt p { margin: 0; }
@media (max-width: 700px) { .ln-rec-card { flex-direction: column; align-items: flex-start; } .ln-rec-card .btn { width: 100%; justify-content: center; } }
.ln-rec .ln-cert-name { font-size: clamp(1.9rem, 5.4vw, 3rem); }
.ln-rec-t { width: 100%; max-width: 760px; margin: 18px auto 0; border-collapse: collapse; font-size: .85rem; text-align: left; }
.ln-rec-t th { font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; border-bottom: 1.5px solid var(--fg); padding: 6px 10px 6px 0; }
.ln-rec-t td { border-bottom: 1px solid var(--line); padding: 6px 10px 6px 0; vertical-align: top; }
.ln-rec-t td:last-child, .ln-rec-t th:last-child { padding-right: 0; white-space: nowrap; }
.ln-rec-n { display: inline-block; min-width: 1.8em; color: var(--muted); }
.ln-rec-id { font-weight: 600; letter-spacing: .02em; }
.ln-rec-row { margin-top: 22px; }
@media (max-width: 700px) {
  .ln-rec-t { font-size: .74rem; }
  .ln-rec-t th:nth-child(3), .ln-rec-t td:nth-child(3) { display: none; }
  .ln-rec-t td:nth-child(2) { white-space: nowrap; }
}
@media print {
  .ln-rec .ln-cert-frame { padding: 18px 40px 14px; }
  .ln-rec .ln-cert-name { font-size: 30px; padding-bottom: 4px; }
  .ln-rec .ln-cert-pre { margin-top: 6px; font-size: 13px; }
  .ln-rec .ln-cert-title { margin-top: 8px; }
  .ln-rec-t { font-size: 9.5px; margin-top: 10px; max-width: none; }
  .ln-rec-t td, .ln-rec-t th { padding: 2px 8px 2px 0; }
  .ln-rec-row { margin-top: 10px; }
  .ln-rec .ln-cert-qr a { width: 78px; }
  .ln-rec .ln-cert-sig { margin-top: 10px; }
  .ln-rec .ln-cert-fine { margin-top: 8px; }
}
.vf-tbl { margin: 0; border-top: 1px solid var(--line); }
.vf-tbl table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.vf-tbl th { text-align: left; font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); padding: 10px 12px; }
.vf-tbl td { border-top: 1px solid var(--line); padding: 9px 12px; vertical-align: top; }
@media (max-width: 560px) { .vf-tbl table { min-width: 520px; } .vf-tbl { overflow-x: auto; } }
@media print {
  @page rec { size: A4 portrait; margin: 8mm; }
  .ln-cert-stage:has(.ln-rec) { page: rec; }
  .ln-rec .ln-cert-frame { padding: 22px 34px 16px; }
  .ln-rec-t { font-size: 10px; }
  .ln-rec-t td, .ln-rec-t th { padding: 3.5px 8px 3.5px 0; }
}