:root{--bg:#000;--fg:#fff;--soft:#0a0a0a;--mute:rgba(255,255,255,.5);--faint:rgba(255,255,255,.3);
  --line:rgba(255,255,255,.14);--line2:rgba(255,255,255,.22);
  --font:-apple-system,"SF Pro Text","Helvetica Neue",Arial,sans-serif}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{background:var(--bg);overscroll-behavior-y:contain;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:300 16px/1.55 var(--font);-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer}
b,strong{font-weight:600}
.light{font-weight:300}
h1,h2,h3{margin:0;font-weight:300;letter-spacing:-.015em;line-height:1.12}
h1{font-size:clamp(36px,8vw,68px)}
h1 b{font-weight:500}
h2{font-size:clamp(26px,4.5vw,40px);margin-bottom:30px}
h3{font-size:17px;font-weight:500;margin:24px 0 6px;letter-spacing:0}
p{margin:0 0 14px}
.muted{color:var(--mute)}
.center{text-align:center}
.eyebrow,.brand{font-size:13px;letter-spacing:.32em;text-transform:uppercase}

.btn{display:inline-block;background:var(--fg);color:#000;text-decoration:none;padding:16px 32px;border-radius:999px;
  font-size:15px;letter-spacing:.02em;border:1px solid var(--fg);transition:.2s;position:relative}
.btn.ghost{background:transparent;color:var(--mute);border-color:var(--line2)}
.btn.block{display:block;width:100%;text-align:center;font-family:var(--font)}

/* ---------- mini app ---------- */
body.app{max-width:480px;margin:0 auto;min-height:100vh;font-size:15px;padding-bottom:calc(24px + env(safe-area-inset-bottom) + var(--tg-bottom,0px))}
/* --tg-top/--tg-bottom are set from Telegram's safe-area insets; in fullscreen they keep the
   header clear of Telegram's floating close and menu buttons. Zero outside Telegram. */
.app header{position:sticky;top:0;z-index:10;padding:calc(14px + var(--tg-top,0px)) 20px 6px;background:linear-gradient(#000 78%,rgba(0,0,0,0))}
.hd-top{display:flex;justify-content:space-between;align-items:baseline}
.hd-right{display:flex;align-items:center;gap:10px}
#cnt{font-size:12px;color:var(--mute);letter-spacing:.08em}
.bar{height:1px;background:var(--line);margin:10px 0 12px}
.bar i{display:block;height:1px;width:0;background:#fff;transition:width .9s ease}
#chips{display:flex;gap:8px;overflow-x:auto;padding-bottom:10px;scrollbar-width:none}
#chips[hidden]{display:none}
#chips::-webkit-scrollbar{display:none}
.chip{flex:none;border:1px solid var(--line2);background:transparent;border-radius:999px;padding:5px 13px;font-size:12px;letter-spacing:.04em;color:rgba(255,255,255,.65);transition:.25s}
.chip.on{background:#fff;color:#000;border-color:#fff}
#app{padding:0 0 20px}
.pad{padding:12px 20px}
.intro{padding:6px 28px 0;text-align:center;color:var(--mute);font-size:13px}
#map{touch-action:pan-y;display:block;width:100%;height:auto;margin-top:6px}
.edge{fill:none;stroke:rgba(255,255,255,.16);stroke-width:1;stroke-dasharray:2 4;transition:opacity .4s}
.edge.lit{stroke:rgba(255,255,255,.8);stroke-dasharray:none}
.edge.fresh{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.3s ease forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.node{cursor:pointer;transition:opacity .4s}
.dim{opacity:.16}
.ring{fill:#000;stroke:rgba(255,255,255,.22);stroke-width:1}
.dot{fill:rgba(255,255,255,.22)}
.lbl{font-size:10.5px;fill:rgba(255,255,255,.38);text-anchor:middle;font-weight:300}
.cap{font-size:7px;letter-spacing:.18em;fill:rgba(255,255,255,.3);text-anchor:middle}
.halo{opacity:0}
.check{fill:none;stroke:#000;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;opacity:0}
.n-open .ring{stroke:#fff;stroke-width:1.2}
.n-open .dot{fill:#fff}
.n-open .lbl{fill:#fff}
.n-open .halo{opacity:1;animation:breathe 4.5s ease-in-out infinite;transform-box:fill-box;transform-origin:center}
@keyframes breathe{0%,100%{transform:scale(.8);opacity:.55}50%{transform:scale(1.15);opacity:1}}
.n-done .ring{fill:#fff;stroke:#fff}
.n-done .dot{opacity:0}
.n-done .check{opacity:1}
.n-done .lbl{fill:rgba(255,255,255,.85)}
.n-locked .ring{stroke-dasharray:2 3}
.ripple{fill:none;stroke:#fff;stroke-width:1;opacity:0;transform-box:fill-box;transform-origin:center}
.fresh .ripple{animation:ripple 1.8s ease-out .5s 2}
@keyframes ripple{0%{transform:scale(1);opacity:.8}100%{transform:scale(3);opacity:0}}
.fresh .ring{animation:pop 1s ease-out .4s backwards;transform-box:fill-box;transform-origin:center}
@keyframes pop{from{transform:scale(.5);opacity:0}}


/* bottom sheet */
#scrim{position:fixed;inset:0;background:rgba(0,0,0,.65);opacity:0;pointer-events:none;transition:opacity .35s;z-index:20}
#sheet{position:fixed;left:50%;bottom:0;width:100%;max-width:480px;max-height:92vh;overflow:auto;transform:translate(-50%,102%);
  transition:transform .5s cubic-bezier(.2,.8,.2,1);background:#0a0a0a;border-top:1px solid var(--line);border-radius:24px 24px 0 0;
  padding:10px 20px calc(24px + env(safe-area-inset-bottom) + var(--tg-bottom,0px));z-index:30}
.show #scrim{opacity:1;pointer-events:auto}
.show #sheet{transform:translate(-50%,0)}
.grip{width:36px;height:3px;border-radius:2px;background:var(--line2);margin:0 auto 16px}
.sh-track{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute)}
#sheet h2{font-size:24px;margin:4px 0 2px}
.meta{font-size:12px;color:var(--mute)}
.sheet-video{margin:16px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#000}
/* The practice video rests in the page's monochrome and comes to full colour as it plays: the
   still frame stays part of the design, the thing you actually watch is not dimmed. */
.sheet-video video{width:100%;display:block;aspect-ratio:16/9;filter:grayscale(1) contrast(1.05);transition:filter .7s ease}
.sheet-video video.playing{filter:none}
@media (prefers-reduced-motion:reduce){.sheet-video video{transition:none}}
.lesson-body{color:rgba(255,255,255,.75);margin-bottom:10px}
.lesson-next{font-size:12px;color:var(--mute);margin:0 0 18px}
#sheet .btn.done{background:transparent;color:rgba(255,255,255,.6);border-color:var(--line2)}
.comments{margin-top:28px;border-top:1px solid var(--line);padding-top:14px}
.comments h3{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute);margin:0 0 12px;font-weight:300}
#toast{position:fixed;left:50%;bottom:calc(28px + env(safe-area-inset-bottom));transform:translate(-50%,20px);max-width:calc(100% - 40px);
  padding:11px 18px;border-radius:999px;background:#fff;color:#000;font-size:13px;opacity:0;pointer-events:none;transition:.35s;z-index:40;text-align:center}
#toast.on{opacity:1;transform:translate(-50%,0)}

.app h1{font-size:30px}
.err{padding:60px 24px;text-align:center}.err h1{margin-bottom:12px}

/* header buttons, push prompt */
.hbtn{background:none;border:1px solid var(--line2);border-radius:999px;color:var(--mute);font-size:11px;letter-spacing:.08em;padding:3px 11px;line-height:1.4}
.hbtn.on,.hbtn.bell.on{background:#fff;color:#000;border-color:#fff}
.hbtn.bell{padding:4px 7px;display:flex}
.hbtn[hidden]{display:none}
.ask{display:flex;align-items:center;gap:10px;margin:10px 20px 0;padding:10px 14px;border:1px solid var(--line);border-radius:14px;font-size:13px;color:var(--mute)}
.ask span{flex:1}

/* comments */
.cm{padding:10px 0;border-bottom:1px solid var(--line)}
.cm-h{display:flex;gap:10px;align-items:baseline;font-size:12px;color:var(--mute)}
.cm-h b{color:#fff;font-weight:500}
.cm-h span{flex:1}
.cm p{margin:4px 0 0;font-size:14px;white-space:pre-wrap;word-break:break-word;color:rgba(255,255,255,.85)}
.x{background:none;border:0;color:var(--faint);font-size:18px;line-height:1;padding:0 4px}
.cform{display:flex;gap:8px;align-items:flex-end;margin-top:14px}
.cform textarea,.fld input,.fld textarea{width:100%;background:#000;border:1px solid var(--line2);border-radius:14px;color:#fff;font:300 15px/1.4 var(--font);padding:10px 14px;resize:none}
.cform textarea{flex:1}
.send{flex:none;width:40px;height:40px;border-radius:50%;border:0;background:#fff;color:#000;font-size:18px}
.send:disabled{opacity:.4}

/* editor */
.node.drag{opacity:.7;cursor:grabbing}
.node.draft .ring{stroke-dasharray:3 3}
.node.sel .ring{stroke-width:2.5;fill:#1a1a1a}
.cell:hover .edge.ed{stroke:rgba(255,255,255,.4);stroke-dasharray:4 4}
.edge.ed.hot{stroke:#fff;stroke-dasharray:none}
#etools{position:fixed;left:50%;transform:translateX(-50%);bottom:0;width:100%;max-width:480px;z-index:15;display:flex;gap:8px;align-items:center;
  padding:12px 16px calc(12px + env(safe-area-inset-bottom) + var(--tg-bottom,0px));background:#000;border-top:1px solid var(--line)}
#etools[hidden]{display:none}
body.editing{padding-bottom:calc(76px + env(safe-area-inset-bottom))}
.hint{flex:1;font-size:12px;color:var(--mute);overflow:hidden;text-overflow:ellipsis}
.tb{flex:none;background:#fff;color:#000;border:1px solid #fff;border-radius:999px;padding:7px 14px;font-size:13px}
.tb.ghost{background:transparent;color:var(--mute);border-color:var(--line2)}

/* forms in sheets */
.fld{display:block;margin:14px 0}
.fld>span{display:block;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);margin-bottom:6px}
.fld textarea{min-height:140px}
.chk{display:flex;align-items:center;gap:10px;margin:14px 0 10px;font-size:14px;color:var(--mute)}
.chk input{width:18px;height:18px;accent-color:#fff}
.btn.small{padding:8px 16px;font-size:13px}
.btn:disabled{opacity:.4}
.row2{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
#sheet .btn.block{margin-top:10px}
#sheet .btn.danger{color:#ff8f8f;border-color:rgba(255,143,143,.4)}
.prog{height:3px;background:var(--line);border-radius:2px;margin:8px 0}
.prog i{display:block;height:100%;width:0;background:#fff;border-radius:2px;transition:width .2s}
.prog[hidden]{display:none}

main{max-width:480px;margin:0 auto;padding:80px 24px;text-align:center}
main h1{font-size:30px;margin-bottom:12px}

.node.sel{cursor:grab}
.node.sel .halo{opacity:1}
.fld select{width:100%;background:#000;border:1px solid var(--line2);border-radius:14px;color:#fff;font:300 15px var(--font);padding:10px 14px}
.trow{display:flex;gap:6px;align-items:center;margin:8px 0}
.trow input{flex:1;background:#000;border:1px solid var(--line2);border-radius:14px;color:#fff;font:300 15px var(--font);padding:9px 14px}
.x:disabled{opacity:.25}
.trow .x{font-size:20px;padding:4px 8px}
.clip{flex:none;width:40px;height:40px;border-radius:50%;border:1px solid var(--line2);background:none;color:var(--mute);display:flex;align-items:center;justify-content:center}
.vchip{display:flex;align-items:center;gap:8px;margin-top:10px;padding:6px 12px;border:1px solid var(--line2);border-radius:999px;font-size:12px;color:var(--mute);width:fit-content}
.vchip[hidden]{display:none}
.cm-video{display:block;width:100%;max-height:60vh;margin-top:8px;border-radius:12px;background:#000}

/* ======================================================================
   New in the unified app: progress block, line cards, lesson framing
   fields (Цель / Задачи / Итог), submissions, threaded comments with
   reactions, the profile sheet and the admin screens.
   ====================================================================== */

/* rich text coming from the WYSIWYG editor or from markdown */
.rich>:first-child{margin-top:0}
.rich>:last-child{margin-bottom:0}
.rich ul,.rich ol{margin:0 0 14px;padding-left:22px}
.rich li{margin-bottom:6px}
.rich a{color:#fff;text-decoration:underline;text-underline-offset:3px}

/* header: profile button sits next to the bell */
.brand{text-decoration:none;color:inherit}
#profile{min-width:30px}

/* progress block, above the map and in the profile sheet */
.prog-block{margin:12px 20px 4px;padding:14px 16px;border:1px solid var(--line);border-radius:16px}
.prog-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.prog-head b{font-weight:500;font-size:15px}
.prog-head span{font-size:12px;color:var(--mute)}
.prog-bar{height:2px;background:var(--line);margin:10px 0 2px;border-radius:2px}
.prog-bar i{display:block;height:2px;background:#fff;border-radius:2px;width:0;transition:width .9s ease}
.prog-lines{margin-top:12px;display:flex;flex-direction:column;gap:7px}
.prog-line{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--mute)}
.prog-line span:first-child{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prog-line.full{color:#fff}
.prog-line .tick{color:#fff}

/* line chips open a line card rather than only filtering */
.chip.info::after{content:'›';margin-left:6px;opacity:.5}

/* line card sheet */
.line-card h2{margin-bottom:6px}
.line-card .sec-out{margin-top:18px;padding-top:14px;border-top:1px solid var(--line)}
.lc-list{margin-top:18px;display:flex;flex-direction:column;gap:2px}
.lc-row{display:flex;gap:12px;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--line);text-align:left;background:none;border-top:0;border-left:0;border-right:0;width:100%}
.lc-row b{font-weight:400;flex:1}
.lc-row.done b{color:rgba(255,255,255,.6)}
.lc-row.locked b{color:var(--mute)}
.lc-state{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.lc-row.done .lc-state{color:#fff}
.lc-goal{font-size:12px;color:var(--mute);margin:2px 0 0;width:100%}

/* the three framing fields in a lesson sheet */
.l-goal{margin:10px 0 2px;color:#fff}
.l-field{margin:18px 0}
.l-field>.eyebrow{display:block;margin-bottom:7px}
.l-outcome{margin:16px 0;padding:12px 14px;border:1px solid var(--line);border-radius:14px;font-size:14px;color:rgba(255,255,255,.8)}
.l-mode{font-size:12px;color:var(--mute);margin:0 0 10px}

/* video reports */
.sub-state{margin:14px 0;padding:12px 14px;border:1px solid var(--line2);border-radius:14px;font-size:14px}
.sub-state.pending{border-color:var(--line2)}
.sub-state.approved{border-color:rgba(255,255,255,.55)}
.sub-state.rejected{border-color:rgba(255,143,143,.5)}
.sub-state b{display:block;margin-bottom:4px;font-weight:500}
.sub-state p{margin:6px 0 0;color:rgba(255,255,255,.8);white-space:pre-wrap}
.sub-video{width:100%;max-height:50vh;margin-top:10px;border-radius:12px;background:#000;display:block}

/* comments: replies, media, reactions */
.cm.reply{margin-left:20px;padding-left:12px;border-left:1px solid var(--line)}
.cm-photo{display:block;width:100%;max-height:60vh;object-fit:contain;margin-top:8px;border-radius:12px;background:#000}
.cm-acts{display:flex;gap:6px;align-items:center;margin-top:7px;flex-wrap:wrap}
.rx{background:none;border:1px solid var(--line);border-radius:999px;padding:2px 9px;font-size:12px;color:var(--mute);line-height:1.6}
.rx.on{border-color:#fff;color:#fff}
.rx-add{color:var(--faint)}
.cm-reply-btn{background:none;border:0;color:var(--mute);font-size:12px;padding:2px 4px}
.cm-reply-to{font-size:12px;color:var(--mute);margin:0 0 6px;display:flex;gap:8px;align-items:center}

/* profile / subscription sheet */
.me-head{display:flex;gap:12px;align-items:center;margin:4px 0 16px}
.me-head img{width:44px;height:44px;border-radius:50%;object-fit:cover;filter:grayscale(1)}
.me-head b{display:block;font-weight:500}
.sub-box{padding:14px 16px;border:1px solid var(--line);border-radius:16px;margin:4px 0 14px}
.sub-box b{display:block;font-weight:500;margin-bottom:4px}
.rowlink{display:flex;justify-content:space-between;align-items:center;width:100%;background:none;border:0;border-bottom:1px solid var(--line);padding:13px 0;font-size:15px;text-align:left;color:inherit;text-decoration:none}
.rowlink span.muted{font-size:13px}
.rowlink::after{content:'›';color:var(--faint);margin-left:10px}

/* admin screens inside the app */
.tabs{display:flex;gap:8px;overflow-x:auto;margin:2px 0 14px;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}
.stat{padding:12px 14px;border:1px solid var(--line);border-radius:14px}
.stat b{display:block;font-size:22px;font-weight:300;letter-spacing:-.02em}
.stat span{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute)}
.spark{display:flex;align-items:flex-end;gap:2px;height:46px;margin:6px 0 18px}
.spark i{flex:1;background:rgba(255,255,255,.3);min-height:1px;border-radius:1px}
.spark i.b{background:#fff}
.tbl{width:100%;font-size:13px;border-collapse:collapse}
.tbl th{text-align:left;font-weight:400;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);padding:6px 6px 6px 0;border-bottom:1px solid var(--line)}
.tbl td{padding:9px 6px 9px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl td.r{text-align:right}
.badge{display:inline-block;font-size:11px;padding:1px 8px;border:1px solid var(--line2);border-radius:999px;color:var(--mute);white-space:nowrap}
.badge.warn{border-color:rgba(255,255,255,.5);color:#fff}
.q-item{padding:14px 0;border-bottom:1px solid var(--line)}
.q-item h4{margin:0 0 4px;font-size:15px;font-weight:500}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.fld.half{display:inline-block;width:calc(50% - 5px)}
.fld.half+.fld.half{margin-left:8px}
.row2 .btn{flex:1}
.empty{padding:28px 0;text-align:center;color:var(--mute);font-size:14px}
.pad20{padding:0 20px}

/* ---------- video: expand control and the fullscreen fallback ----------
   Telegram's webview does not reliably hand off to the browser's fullscreen, so each video carries
   its own control. Two paths have to look right: real fullscreen (:fullscreen, rendered in the top
   layer) and our overlay (.cinema, used when the API is unavailable or refused). */
.vwrap{position:relative}
.vfs{position:absolute;top:8px;right:8px;width:32px;height:32px;border-radius:50%;
  border:1px solid var(--line2);background:rgba(0,0,0,.55);color:#fff;display:flex;align-items:center;
  justify-content:center;padding:0;backdrop-filter:blur(4px);opacity:.75;transition:opacity .2s}
.vfs:hover,.vfs:focus-visible{opacity:1}

/* In real fullscreen the element fills the screen, so the design filter and the ratio must come off. */
video:fullscreen{filter:none;aspect-ratio:auto;width:100%;height:100%;object-fit:contain;background:#000}
video:-webkit-full-screen{filter:none;aspect-ratio:auto;width:100%;height:100%;object-fit:contain;background:#000}

.cinema{position:fixed;inset:0;z-index:60;background:#000;display:flex;align-items:center;justify-content:center}
.cinema video{width:100%;max-height:100vh;aspect-ratio:auto;border-radius:0;object-fit:contain;filter:none}
.cinema-x{position:absolute;top:calc(10px + var(--tg-top,0px));right:14px;width:40px;height:40px;
  border-radius:50%;border:1px solid var(--line2);background:rgba(0,0,0,.6);color:#fff;font-size:24px;
  line-height:1;padding:0;z-index:61}
body.cinema-on{overflow:hidden}

/* A video report and its review are an ordinary comment thread, marked as private so nobody wonders
   who else can read it. */
.cm.private{border-left:1px solid var(--line2);padding-left:12px;margin-left:-1px}
.cm-kind{display:flex;gap:8px;align-items:baseline;font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--mute);margin-bottom:6px}
.cm-kind span{letter-spacing:.04em;text-transform:none;color:var(--faint)}
.cm.reply.private{margin-left:20px}
/* The review queue's note from the student, so it does not read as the admin's own text. */
.q-note{font-size:14px;color:rgba(255,255,255,.8);margin:8px 0 0;white-space:pre-wrap}
.q-item .fld{margin:14px 0 6px}
.q-item .fld textarea{min-height:0}

/* materials sheet: the /materials blocks as a fragment */
.materials .sec{padding:18px 0;border-bottom:1px solid var(--line)}
.materials .sec:last-child{border-bottom:0}
.materials h2{font-size:20px;margin:0 0 10px}
.materials h3{font-size:16px;margin:0 0 8px}
.materials .rich{color:rgba(255,255,255,.72);font-size:14px}
.materials .sec-img img{width:100%;display:block;border-radius:14px;margin-top:12px}
.materials .links{list-style:none;margin:12px 0 0;padding:0}
.materials .link-item{border-top:1px solid var(--line)}
.materials .link-item a{display:flex;justify-content:space-between;gap:12px;padding:13px 2px;color:inherit;text-decoration:none}
.materials .link-item a i{font-style:normal;color:var(--mute)}
.materials .tracks{display:grid;gap:10px;margin-top:12px}
.materials .track{padding:14px 16px;border:1px solid var(--line);border-radius:14px}
.materials audio{width:100%;display:block}

.coin-row{display:flex;justify-content:space-between;align-items:baseline;margin:14px 0;padding:14px 18px;border:1px solid var(--line);border-radius:16px}
.coin-row b{font-weight:500;font-size:20px}