:root{--bg:#0f1220;--card:#191d33;--line:#2a2f4d;--txt:#eef0fa;--muted:#9aa0c3;--acc:#6c7bff;--acc2:#38d9a9;--err:#ff6b6b}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Tahoma,Arial,sans-serif;background:var(--bg);color:var(--txt);min-height:100vh;display:flex;flex-direction:column}
header.top{display:flex;justify-content:space-between;align-items:center;padding:14px 22px;border-bottom:1px solid var(--line);background:#0b0e1a;position:sticky;top:0}
.brand{font-size:20px;font-weight:700;color:var(--acc)}
nav a{color:var(--txt);text-decoration:none;margin-inline-start:14px}
nav a:hover{color:var(--acc2)}
main{flex:1;max-width:1000px;width:100%;margin:0 auto;padding:28px 18px}
footer{text-align:center;padding:18px;border-top:1px solid var(--line);font-size:13px}
.hero{text-align:center;padding:44px 10px 34px}
.hero h1{font-size:32px;margin-bottom:12px}
.hero p{color:var(--muted);margin-bottom:20px;font-size:17px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;margin-bottom:18px}
.card h3{margin-bottom:8px;color:var(--acc2)}
.card p{color:var(--muted);margin-bottom:10px;line-height:1.7}
.btn{display:inline-block;background:var(--acc);color:#fff;border:0;border-radius:9px;padding:10px 20px;font-size:15px;cursor:pointer;text-decoration:none;font-family:inherit}
.btn:hover{filter:brightness(1.15)}
.btn.big{font-size:18px;padding:13px 34px}
.btn.sm{padding:5px 12px;font-size:13px}
.btn.danger{background:#a33}
.narrow{max-width:420px;margin:40px auto}
.muted{color:var(--muted);font-size:13px}
.err{color:var(--err);margin-bottom:10px}
.ok{color:var(--acc2);margin-bottom:12px}
form label{display:block;margin-bottom:12px;font-size:14px}
input,select,textarea{width:100%;padding:9px 11px;border-radius:8px;border:1px solid var(--line);background:#101427;color:var(--txt);font-family:inherit;margin-top:4px}
input.num{width:90px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:right;vertical-align:top}
th{color:var(--muted);font-weight:600}
form.inline{display:flex;gap:6px;align-items:center}
form.inline input{padding:6px 8px;font-size:13px}
.rowform{display:flex;gap:10px;margin-bottom:14px}
.rowform input{flex:1}
.status-ready{color:var(--acc2)} .status-processing{color:#ffd166} .status-error{color:var(--err)}
ul.lessons{list-style:none}
ul.lessons li{padding:10px 4px;border-bottom:1px dashed var(--line)}
ul.lessons li a{color:var(--txt);text-decoration:none;font-size:16px}
ul.lessons li a:hover{color:var(--acc2)}
ul.lessons li .muted{margin-inline-start:10px}
.watch h2{margin-bottom:6px}
.playerwrap{position:relative;margin-top:16px;background:#000;border-radius:14px;overflow:hidden}
video{width:100%;display:block;aspect-ratio:16/9}
.wm{position:absolute;top:8%;inset-inline-start:8%;color:rgba(255,255,255,.75);font-size:15px;pointer-events:none;text-shadow:0 0 6px #000;transition:all 1.5s ease;z-index:5;background:rgba(0,0,0,.25);padding:3px 8px;border-radius:6px}
code{background:#101427;padding:3px 8px;border-radius:6px;color:var(--acc2)}