:root{--bg:#0e121b;--surface:#171d2a;--surface2:#1e2636;--surface3:#262e42;--line:#31394c;--muted:#9aa7bd;--text:#f3f4fa;--accent:#baa2f8;--mint:#7dd9bf;--warm:#dfbd94;--danger:#ef9ba5;--radius:20px;--shadow:0 12px 40px #070c16aa}
*{box-sizing:border-box}
html{scroll-behavior:smooth}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.47;cursor:not-allowed}a{color:var(--mint)}[hidden]{display:none!important}
.ambient{position:fixed;z-index:-1;border-radius:50%;filter:blur(90px);pointer-events:none}.ambient.a{width:500px;height:460px;top:-210px;right:-150px;background:#4932764d}.ambient.b{width:560px;height:480px;left:4%;bottom:-300px;background:#176b6550}
.shell{max-width:1500px;margin:auto;min-height:100vh;display:grid;grid-template-columns:258px minmax(0,1fr)}
.sidebar{border-right:1px solid #ffffff0f;background:#111724bb;display:flex;flex-direction:column;padding:32px 22px;position:sticky;top:0;height:100vh}
.brand{display:flex;gap:13px;align-items:center;margin-bottom:56px}
.brand-logo{width:47px;height:47px;border:1px solid #c0abf866;border-radius:16px;display:grid;place-items:center;font-size:32px;color:var(--accent);background:linear-gradient(145deg,#342b54,#1a2430)}
.brand strong{display:block;font-family:Georgia,serif;font-size:20px;font-weight:500;letter-spacing:.01em}.brand small{display:block;color:var(--muted);letter-spacing:.21em;font-size:9px;margin-top:1px}
.side-label,.eyebrow{font-size:10px;letter-spacing:.2em;font-weight:700;color:var(--accent)}
.side-label{margin:0 0 14px 15px;color:#8190ae}
.side-nav{display:flex;flex-direction:column;gap:6px}.nav-item{border:none;border-radius:13px;background:transparent;color:#9ba8bd;display:flex;gap:14px;align-items:center;text-align:left;padding:13px 15px;width:100%;font-weight:600}.nav-item .nav-emoji{font-size:19px;width:24px}.nav-item.active,.nav-item:hover{background:#bca7f01c;color:#f6f3ff}.nav-item.active{border:1px solid #ba9fff45}.nav-item:not(.active){border:1px solid transparent}
.side-bottom{margin-top:auto;display:flex;align-items:center;gap:13px;border-top:1px solid var(--line);padding-top:24px}.profile-circle{border-radius:50%;width:41px;height:41px;display:grid;place-items:center;background:#393152;color:var(--accent);font-size:25px}.side-bottom b{font-size:13px}.side-bottom small{display:block;color:var(--muted);font-size:11px}
.main-panel{min-width:0;padding:0 0 60px}.topbar{height:84px;padding:0 42px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #ffffff0c}.crumbs{font-size:11px;color:#92a1ba;font-weight:700;letter-spacing:.18em;max-width:70%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.top-end{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:12px}.connection-dot{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 10px #7dd9bfaa}.icon-btn{width:39px;height:39px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--text);font-size:21px}#main{max-width:1180px;margin:0 auto;padding:35px 42px;animation:rise .27s ease-out}@keyframes rise{from{opacity:.7;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.hero{background:radial-gradient(ellipse at 85% 0%,#65518e5c 0%,transparent 56%),linear-gradient(120deg,#20273a,#171f2d);border:1px solid #867ba559;border-radius:28px;padding:33px;position:relative;overflow:hidden;min-height:205px;display:flex;justify-content:space-between;gap:15px}.hero::after{content:"𝄞";position:absolute;right:30px;top:-68px;font-family:Georgia,serif;font-size:260px;color:#d1bdff12;transform:rotate(-8deg);pointer-events:none}.hero h1{font:normal clamp(30px,4vw,45px)/1.15 Georgia,serif;letter-spacing:-.035em;margin:13px 0}.hero p{color:#b6bfd0;max-width:530px;margin:0}.hero .eyebrow{color:var(--mint)}.hero strong{color:#f1e5ff}.hero-content{z-index:1}.hero .hero-stats{z-index:1;align-self:flex-end;display:flex;gap:20px}.mini-stat span{display:block;color:#a6b1c5;font-size:11px}.mini-stat b{font:normal 30px Georgia,serif;color:#e4d5ff}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:15px;margin:30px 0 17px}.section-head h2,.page-head h1{font:normal clamp(26px,3vw,34px)/1.2 Georgia,serif;letter-spacing:-.035em;margin:5px 0}.section-head p,.page-head p{color:var(--muted);font-size:13px;margin:0}.page-head{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:25px}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.cards.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:linear-gradient(146deg,#202739,#171e2c);border:1px solid #3a4054;border-radius:var(--radius);padding:23px;min-width:0;box-shadow:0 8px 30px #080d1640;position:relative}.card.clickable{cursor:pointer;transition:transform .17s,border-color .17s,background .17s}.card.clickable:hover{transform:translateY(-2px);border-color:#ba9afa88}.card.clickable:focus-visible,button:focus-visible{outline:2px solid var(--mint);outline-offset:2px}.card-icon{width:52px;height:52px;border-radius:16px;background:#ab93ef24;display:grid;place-items:center;font-size:26px;margin-bottom:19px;border:1px solid #ac91ed39}.card-icon.mint{background:#57cfb51e;border-color:#7dd9bf41}.card-icon.gold{background:#d8bc971d;border-color:#d8bc9745}.card h3{font:normal 21px Georgia,serif;margin:4px 0 7px}.card p{color:var(--muted);font-size:13px;line-height:1.5;margin:0}.card-meta{font-size:12px;color:var(--mint);margin-top:20px}.card .arrow{position:absolute;right:21px;top:22px;color:#b6a3dc;font-size:23px}.card .chip{margin-top:16px}
.chip{display:inline-flex;gap:6px;align-items:center;border:1px solid #63647c;border-radius:100px;padding:4px 11px;color:#bec6d3;font-size:11px}.chip.mint{border-color:#6bc9b56e;color:#93e8d2}.chip.amber{border-color:#bda47c77;color:#e0be8a}.chip.rose{border-color:#cf899177;color:#f6a8b0}
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 16px}.muted{color:var(--muted)}.small{font-size:12px}.slab{background:#191f2d;border:1px solid #323a4f;border-radius:18px;padding:20px;margin-bottom:13px}.list-item{display:flex;justify-content:space-between;gap:16px;align-items:center}.list-text{min-width:0}.list-text b{display:block;color:var(--text);font-size:15px}.list-text small{display:block;color:var(--muted);font-size:12px}.list-item .item-index{display:grid;place-items:center;min-width:42px;height:42px;border-radius:13px;background:#aa97e526;color:var(--accent);font:19px Georgia,serif}.list-item .list-main{display:flex;align-items:center;gap:15px;min-width:0;flex:1}
.button{border:1px solid var(--line);border-radius:12px;padding:10px 16px;background:var(--surface2);color:var(--text);font-size:13px;font-weight:650;transition:filter .2s,border-color .2s}.button:hover{filter:brightness(1.17)}.button.primary{background:linear-gradient(135deg,#c8b4ff,#a79be7);color:#151326;border-color:transparent}.button.mint{background:#7dd9bf;color:#11221e;border-color:transparent}.button.ghost{background:transparent;color:#c7cee2}.button.danger{border-color:#ac6277;color:#ffc2cd}.button.tiny{padding:7px 11px;font-size:11px}.button.full{width:100%}.button-row{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}.back-link{background:none;border:none;color:#b8a6e9;font-size:13px;padding:0 5px 12px 0;font-weight:600}
.lesson-breadcrumb{color:#9baac5;font-size:12px;display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-bottom:19px}.lesson-breadcrumb span{color:#6c7b9c}.lesson-info{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.lesson-tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:15px}.lesson-tabs .button{background:transparent}.lesson-tabs .button.on{background:#a899dc2e;color:#e3d8ff;border-color:#a08ac979}
.paper{background:#1b2232;border:1px solid #414963;border-radius:20px;padding:clamp(20px,3vw,32px);min-height:180px}.paper h3{font:normal 24px Georgia,serif;margin:0 0 16px}.paper p{color:#d9dfea;line-height:1.8;white-space:pre-line;overflow-wrap:anywhere;margin:0}.paper img{display:block;width:100%;max-width:780px;border-radius:15px;margin:auto}.paper blockquote{border-left:3px solid var(--mint);margin:14px 0;padding-left:18px;color:var(--muted)}
.kpis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.kpi{border-radius:17px;background:var(--surface);border:1px solid var(--line);padding:19px}.kpi b{font:normal 35px Georgia,serif;color:var(--accent);display:block}.kpi span{font-size:12px;color:var(--muted)}
label{display:block;font-size:12px;color:#b9c4d6;margin:12px 0 6px}input,textarea,select{display:block;width:100%;background:#101722;border:1px solid #45516a;border-radius:11px;color:var(--text);padding:12px 13px;outline:none}textarea{min-height:105px;resize:vertical}input:focus,textarea:focus,select:focus{border-color:#baa2f8}input[type=checkbox]{width:auto;display:inline-block;accent-color:#baa2f8;transform:scale(1.14)}input[type=file]{font-size:12px}.field-note{font-size:11px;color:var(--muted)}
.table-wrap{overflow-x:auto}.data-table{width:100%;border-collapse:collapse}.data-table th{text-align:left;font-size:10px;text-transform:uppercase;letter-spacing:.13em;color:var(--muted);font-weight:700;padding:13px 10px;border-bottom:1px solid var(--line)}.data-table td{padding:14px 10px;border-bottom:1px solid #ffffff12;font-size:13px}.data-table tr:last-child td{border:0}
.empty{text-align:center;background:#161d2b;border:1px dashed #45506a;border-radius:20px;padding:45px 24px;color:var(--muted)}.empty .empty-icon{font-size:39px;margin-bottom:12px}.empty strong{display:block;color:var(--text);font:normal 21px Georgia,serif;margin-bottom:8px}.empty p{max-width:350px;margin:0 auto;font-size:13px}
.load-screen{min-height:100vh;display:grid;align-content:center;justify-items:center;gap:10px;font:normal 29px Georgia,serif}.load-screen .note-mark{font-size:60px;color:var(--accent)}.load-screen p{font:13px system-ui;color:var(--muted)}
.bottom-nav{display:none}.modal{border:1px solid #5b5879;border-radius:24px;background:#1a2030;box-shadow:var(--shadow);color:var(--text);width:min(440px,calc(100vw - 32px));max-height:85vh;padding:0}.modal::backdrop{background:#030711c8;backdrop-filter:blur(5px)}.modal-title{padding:24px 24px 8px;font:normal 25px Georgia,serif}.modal-body{padding:4px 24px 20px;max-height:55vh;overflow:auto}.modal-actions{padding:12px 24px 24px;display:flex;justify-content:flex-end;gap:10px}#toast{position:fixed;bottom:27px;right:27px;background:#262f43;color:#f5f3ff;border:1px solid #877bb3;border-radius:14px;padding:12px 20px;z-index:10;opacity:0;pointer-events:none;transform:translateY(15px);transition:.2s}#toast.show{opacity:1;transform:translateY(0)}.checklist{display:grid;gap:10px}.check-row{display:flex;gap:13px;align-items:flex-start;background:var(--surface2);padding:13px 16px;border-radius:12px;color:#d4d9e7}.check-row.done{color:#8e9cb5;text-decoration:line-through}.bar{height:7px;background:#394154;border-radius:6px;overflow:hidden}.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--mint))}
@media(max-width:1030px){.shell{grid-template-columns:210px minmax(0,1fr)}.sidebar{padding:27px 13px}.topbar{padding:0 25px}#main{padding:27px 25px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){
 body{font-size:14px}.shell{display:block}.sidebar{display:none}.main-panel{padding-bottom:calc(78px + env(safe-area-inset-bottom) + var(--tg-content-safe-area-inset-bottom,0px))}
 .topbar{height:58px;padding:0 18px}.top-end{font-size:11px}.crumbs{font-size:10px}
 #main{padding:21px 17px 30px}.hero{padding:25px 22px;min-height:200px}.hero h1{font-size:32px}.hero .hero-stats{display:none}
 .cards{grid-template-columns:1fr;gap:11px}.cards.two{grid-template-columns:1fr}.card{padding:20px;border-radius:18px}.card-icon{margin-bottom:12px;width:43px;height:43px;font-size:23px}
 .section-head{margin-top:25px}.page-head{margin-bottom:17px}.page-head h1{font-size:29px}
 .kpis{gap:8px}.kpi{padding:14px}.kpi b{font-size:27px}.kpi span{font-size:11px}
 .bottom-nav{display:flex;justify-content:space-around;gap:3px;position:fixed;bottom:0;left:0;width:100%;padding:10px 10px calc(11px + env(safe-area-inset-bottom) + var(--tg-content-safe-area-inset-bottom,0px));background:#111622f7;backdrop-filter:blur(18px);border-top:1px solid #3a4156;z-index:5}.bottom-nav button{background:none;border:0;color:#8b99ad;min-width:62px;display:grid;justify-items:center;gap:1px;padding:4px;font-size:10px;font-weight:600}.bottom-nav button b{font-size:22px;font-weight:400}.bottom-nav button.active{color:#cfb9ff}
 .list-item{gap:9px}.list-text b{font-size:13px}.list-item .item-index{min-width:34px;height:34px;font-size:16px}.list-item .button{padding:8px;font-size:11px}.toolbar{align-items:flex-start}.paper{padding:19px;min-height:130px}
 #toast{left:15px;right:15px;bottom:90px;text-align:center}
}
@media(prefers-reduced-motion:reduce){*,*::after,*::before{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Restrict casual copying in the private student lesson reader.
   Browser/client UI cannot stop OS screenshots or camera photos. */
.protected-content{user-select:none;-webkit-user-select:none;position:relative;isolation:isolate}
.protected-content::after{content:attr(data-watermark);position:sticky;display:block;bottom:0;left:0;min-height:20px;padding:4px 0;text-align:right;font-size:10px;letter-spacing:.11em;color:#c3b6ef77;pointer-events:none}
.protected-content input,.protected-content textarea,.protected-content select{user-select:text;-webkit-user-select:text}
.protected-content img{-webkit-user-drag:none;pointer-events:none}
@media print{body::before{content:'MYmusicLessons — материалы доступны только для личного изучения в приложении';display:block;font-size:23px;color:#10141d;padding:40px} .shell{display:none!important}}
/* Learning pathways: clearly separated and compact on mobile. */
details.slab{overflow:hidden;padding:0}
details.slab>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;list-style:none;padding:19px 22px;color:var(--text);font-weight:600;font-size:14px;line-height:1.5}
details.slab>summary::-webkit-details-marker{display:none}
details.slab>summary::after{content:'⌄';font-size:21px;color:var(--accent);font-weight:400;transform:rotate(0);transition:transform .2s ease}
details.slab[open]>summary::after{transform:rotate(180deg)}
details.slab[open]>summary{border-bottom:1px solid #353b52;background:#7e6da50c}
details.slab>.list-item,details.slab>.slab,details.slab>p{margin:12px 16px}
details.slab>.list-item{padding:14px 8px;border-bottom:1px solid #313b50}
details.slab .list-item:last-child{border-bottom:0}
details.slab .empty{padding:22px}
.card details.slab>summary{padding:10px 14px;font-size:12px}
.card details.slab>p{font-size:12px;line-height:1.7}
@media(max-width:720px){details.slab>summary{padding:15px 17px;font-size:13px} details.slab>.list-item{flex-wrap:wrap;padding:12px 8px} details.slab>.list-item>.button{margin-left:auto}}