:root{
  --bg:#0a0b0f; --surface:#13151b; --surface-2:#1a1d26; --surface-3:#22262f;
  --border:#262a35; --border-2:#33384a;
  --text:#eef0f4; --muted:#8b92a3; --muted-2:#6b7280;
  --primary:#3b82f6; --primary-2:#60a5fa; --primary-glow:rgba(59,130,246,.35);
  --danger:#ef4444; --ok:#22c55e; --radius:14px;
  --sb-w:300px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--primary-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}

.container{max-width:1280px;margin:0 auto;padding:28px 24px 80px}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 32px;background:rgba(13,15,20,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.brand{font-weight:700;font-size:18px;color:var(--text);letter-spacing:-.01em}
.brand:hover{text-decoration:none;color:var(--primary-2)}
.topbar nav{display:flex;align-items:center;gap:24px}
.topbar nav a{color:var(--muted);font-size:14.5px;font-weight:500}
.topbar nav a:hover{color:var(--text);text-decoration:none}
.btn-link{border:1px solid var(--border-2);padding:7px 14px;border-radius:8px;color:var(--text)!important;font-size:14px}
.btn-link:hover{background:var(--surface-2);border-color:var(--muted)}
.foot{text-align:center;color:var(--muted-2);font-size:13px;padding:40px 20px}

h1{font-size:30px;margin:0 0 18px;letter-spacing:-.02em;font-weight:700}
h2{font-size:22px;margin:0 0 14px;letter-spacing:-.01em;font-weight:600}
h3{margin:0 0 6px;font-size:16px;font-weight:600}
p{margin:0 0 12px}
.muted{color:var(--muted)} .small{font-size:13px}
.crumb{color:var(--muted);font-size:13px;margin:0 0 10px;text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.crumb a{color:var(--muted)} .crumb a:hover{color:var(--text);text-decoration:none}

/* Forms */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.form{display:flex;flex-direction:column;gap:14px;max-width:420px;margin:80px auto}
label{font-size:13px;color:var(--muted);display:block;margin-bottom:6px;font-weight:500}
input,textarea,select{width:100%;background:var(--surface-2);border:1px solid var(--border);color:var(--text);padding:11px 14px;border-radius:10px;font:inherit}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}
textarea{min-height:110px;resize:vertical}
.btn{display:inline-block;background:var(--primary);color:#fff;border:0;padding:11px 20px;border-radius:10px;font:inherit;cursor:pointer;font-weight:600;transition:background .15s}
.btn:hover{background:var(--primary-2);text-decoration:none;color:#fff}
.btn-sec{background:var(--surface-2);border:1px solid var(--border-2);color:var(--text)}
.btn-sec:hover{background:var(--surface-3)}
.btn-danger{background:var(--danger)}

.flash{padding:12px 16px;border-radius:10px;margin-bottom:18px;font-size:14px}
.flash-ok{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:#86efac}
.flash-err{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.35);color:#fca5a5}

/* ===== CAROUSEL ===== */
.carousel{position:relative;border-radius:18px;overflow:hidden;margin-bottom:40px;box-shadow:0 12px 40px rgba(0,0,0,.5);background:#000}
.carousel-track{display:flex;transition:transform .5s cubic-bezier(.45,.05,.15,.95);will-change:transform}
.slide{position:relative;flex:0 0 100%;aspect-ratio:24/8;overflow:hidden;display:block;color:#fff}
.slide img{width:100%;height:100%;object-fit:cover}
.slide-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:32px 36px;background:linear-gradient(180deg,transparent 30%,rgba(0,0,0,.85) 100%)}
.slide-overlay h2{margin:0 0 6px;color:#fff;font-size:26px}
.slide-overlay p{color:#cbd5e1;margin:0;font-size:15px}
.carousel-btn{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;border:0;background:rgba(0,0,0,.55);color:#fff;font-size:22px;cursor:pointer;opacity:0;transition:opacity .2s,background .2s;z-index:2;display:grid;place-items:center;line-height:1}
.carousel:hover .carousel-btn{opacity:1}
.carousel-btn:hover{background:var(--primary)}
.carousel-btn.prev{left:14px} .carousel-btn.next{right:14px}
.carousel-dots{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:2}
.carousel-dots button{width:8px;height:8px;border-radius:50%;border:0;background:rgba(255,255,255,.4);cursor:pointer;padding:0;transition:width .2s,background .2s}
.carousel-dots button.on{background:#fff;width:22px;border-radius:4px}

/* ===== MODULE GRID — pôster 2:3 (600x900) ===== */
.section{margin-bottom:40px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:18px;gap:12px}
.section-head h2{margin:0}
.mod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
.mod-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s;color:var(--text);display:block}
.mod-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:0 14px 30px -10px var(--primary-glow);text-decoration:none}
.mod-cover{position:relative;aspect-ratio:2/3;background:var(--surface-2);background-size:cover;background-position:center}
.mod-count{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;font-size:10.5px;font-weight:700;padding:4px 9px;border-radius:6px;letter-spacing:.05em;text-transform:uppercase}
.mod-body{padding:12px 14px}
.mod-body h3{font-size:14.5px;margin:0;line-height:1.35}

/* ===== LESSON LAYOUT — sidebar + main ===== */
.container:has(.lesson-shell){max-width:none;padding:0}
.lesson-shell{display:grid;grid-template-columns:var(--sb-w) 1fr;gap:32px;max-width:1480px;margin:0 auto;padding:24px 28px 80px;align-items:start}
@media (max-width: 900px){ .lesson-shell{grid-template-columns:1fr} }

.sidebar{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow-y:auto;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:14px;scrollbar-width:thin;scrollbar-color:var(--border-2) transparent}
.sidebar::-webkit-scrollbar{width:6px}
.sidebar::-webkit-scrollbar-thumb{background:var(--border-2);border-radius:3px}
.sidebar-head{padding:6px 8px 14px;border-bottom:1px solid var(--border);margin-bottom:10px}
.sb-home{font-size:12.5px;color:var(--muted);display:block;margin-bottom:8px}
.sb-home:hover{color:var(--text);text-decoration:none}
.sidebar h3{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin:0;font-weight:600}

.sb-modules{display:flex;flex-direction:column;gap:4px}
.sb-mod{border-radius:8px;overflow:hidden}
.sb-mod summary{display:flex;align-items:center;gap:8px;padding:10px 10px;cursor:pointer;list-style:none;border-radius:8px;font-size:14px;font-weight:600;color:var(--text);transition:background .15s}
.sb-mod summary::-webkit-details-marker{display:none}
.sb-mod summary:hover{background:var(--surface-2)}
.sb-mod[open] summary{background:var(--surface-2)}
.sb-mod-title{flex:1;line-height:1.3}
.sb-mod-count{font-size:11px;color:var(--muted);background:var(--surface-3);padding:2px 7px;border-radius:10px;font-weight:600}
.sb-caret{color:var(--muted);font-size:11px;transition:transform .2s}
.sb-mod[open] .sb-caret{transform:rotate(180deg)}
.sb-lessons{list-style:none;margin:4px 0 8px;padding:0 0 0 6px;display:flex;flex-direction:column;gap:1px}
.sb-lesson{display:flex;align-items:flex-start;gap:10px;padding:8px 10px;border-radius:6px;color:var(--muted);font-size:13.5px;line-height:1.35;transition:background .12s,color .12s}
.sb-lesson:hover{background:var(--surface-2);color:var(--text);text-decoration:none}
.sb-lesson.active{background:rgba(59,130,246,.15);color:var(--primary-2)}
.sb-num{font-size:11px;font-weight:700;color:var(--muted-2);min-width:22px;padding-top:1px;font-variant-numeric:tabular-nums}
.sb-lesson.active .sb-num{color:var(--primary-2)}
.sb-title{flex:1}
.sb-empty{padding:8px 10px;color:var(--muted-2);font-size:13px;font-style:italic}

.lesson-main{min-width:0}
.lesson-title{margin:0 0 20px;font-size:26px}

.player-wrap{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000;margin-bottom:22px;box-shadow:0 10px 40px rgba(0,0,0,.5)}
.player-wrap iframe,.player-wrap video,.player-wrap .plyr{width:100%;height:100%;border:0;display:block}

.lesson-desc{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:22px;color:#dde0e7;margin-bottom:22px}
.lesson-desc h3{margin:0 0 10px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600}
.lesson-desc a{color:var(--primary-2);word-break:break-all}
.lesson-nav{display:flex;justify-content:space-between;gap:12px}

/* Mobile toggle sidebar */
.sb-toggle{display:none;position:fixed;bottom:20px;right:20px;width:52px;height:52px;border-radius:50%;border:0;background:var(--primary);color:#fff;font-size:22px;box-shadow:0 6px 20px rgba(0,0,0,.5);cursor:pointer;z-index:60}

@media(max-width:960px){
  .lesson-shell{grid-template-columns:1fr;padding:18px 16px 100px}
  .sidebar{position:fixed;left:0;top:0;bottom:0;width:86%;max-width:340px;max-height:none;border-radius:0;border:0;border-right:1px solid var(--border);transform:translateX(-100%);transition:transform .3s ease;z-index:55;padding-top:70px}
  body.sb-open .sidebar{transform:translateX(0)}
  body.sb-open::after{content:"";position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:54}
  .sb-toggle{display:grid;place-items:center}
}

/* Plyr theme */
:root{
  --plyr-color-main:var(--primary);
  --plyr-video-control-color:#fff;
  --plyr-video-control-background-hover:var(--primary);
  --plyr-menu-background:rgba(20,22,28,.95);
  --plyr-menu-color:#fff;
}

/* Admin */
table{width:100%;border-collapse:collapse;background:var(--surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border)}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}
th{background:var(--surface-2);font-size:13px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.04em}
tr:last-child td{border-bottom:0}

@media(max-width:720px){
  .container{padding:20px 16px 60px}
  .topbar{padding:14px 18px}
  .topbar nav{gap:14px}
  .slide-overlay{padding:18px}
  .slide-overlay h2{font-size:18px}
  h1{font-size:22px}
}