:root{
  --bg:#f4f7fb;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --text:#10213a;
  --muted:#66758c;
  --border:#e4eaf2;
  --primary:#5b5bd6;
  --primary-2:#7c6cf2;
  --success:#1e9a6c;
  --warning:#d98b18;
  --danger:#d84b5b;
  --shadow:0 14px 35px rgba(37,54,88,.09);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
img{max-width:100%}
.layout{display:grid;grid-template-columns:248px 1fr;min-height:100vh}
.sidebar{
  position:sticky;top:0;height:100vh;
  padding:26px 18px;background:#11182a;color:#dfe6f3;
  display:flex;flex-direction:column;gap:28px
}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px;color:#fff;padding:0 8px}
.brand-mark{
  width:38px;height:38px;border-radius:12px;
  display:grid;place-items:center;background:linear-gradient(135deg,#7777ff,#8b5cf6);
  box-shadow:0 8px 20px rgba(104,89,255,.28)
}
.nav{display:flex;flex-direction:column;gap:7px}
.nav a{padding:11px 12px;border-radius:12px;color:#9ca9bd;font-weight:600;font-size:14px}
.nav a:hover,.nav a.active{background:#1c263d;color:#fff}
.sidebar-bottom{margin-top:auto}
.user-mini{display:flex;gap:10px;align-items:center;background:#1a2439;border:1px solid #27334b;padding:12px;border-radius:14px}
.avatar{width:35px;height:35px;border-radius:50%;display:grid;place-items:center;background:#edf0ff;color:#5b5bd6;font-weight:800}
.user-mini small{display:block;color:#8d9bb1;margin-top:2px}
.main{min-width:0}
.topbar{
  height:78px;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);
  display:flex;align-items:center;justify-content:space-between;padding:0 34px;
  border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5
}
.search{width:min(430px,48vw);position:relative}
.search input{width:100%;padding:12px 16px 12px 42px;border:1px solid var(--border);border-radius:13px;background:#f7f9fc;outline:none}
.search:before{content:"⌕";position:absolute;left:15px;top:7px;font-size:24px;color:#8b96a9}
.top-actions{display:flex;align-items:center;gap:11px}
.icon-btn{border:1px solid var(--border);background:#fff;width:40px;height:40px;border-radius:12px;cursor:pointer}
.content{padding:32px 34px 48px}
.eyebrow{color:var(--primary);font-weight:800;font-size:12px;letter-spacing:.12em;text-transform:uppercase}
h1{font-size:34px;line-height:1.15;margin:7px 0 8px}
h2{font-size:22px;margin:0 0 18px}
h3{margin:0}
p{color:var(--muted);line-height:1.6}
.hero{
  background:linear-gradient(120deg,#171f36 0%,#282f5d 55%,#6359cc 100%);
  color:#fff;border-radius:24px;padding:34px;position:relative;overflow:hidden;
  box-shadow:var(--shadow)
}
.hero:after{content:"";position:absolute;width:270px;height:270px;border-radius:50%;right:-70px;top:-100px;background:rgba(255,255,255,.09)}
.hero p{color:#cdd5e7;max-width:650px}
.hero .btn{margin-top:10px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:0;border-radius:12px;padding:11px 17px;font-weight:750;cursor:pointer
}
.btn-primary{background:var(--primary);color:#fff}
.btn-light{background:#fff;color:#202849}
.btn-outline{background:#fff;border:1px solid var(--border);color:var(--text)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.section{margin-top:30px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px rgba(34,52,86,.04)}
.stat{padding:20px}
.stat .kpi{font-weight:850;font-size:28px;margin-top:7px}
.stat small{color:var(--muted)}
.course-card{overflow:hidden}
.course-cover{
  height:155px;padding:18px;color:white;display:flex;flex-direction:column;justify-content:flex-end;
  background:linear-gradient(135deg,#5d6ee6,#7c5ad9)
}
.course-cover.green{background:linear-gradient(135deg,#1c9b7c,#31b4a0)}
.course-cover.orange{background:linear-gradient(135deg,#d77c32,#e4ab47)}
.course-cover.navy{background:linear-gradient(135deg,#23365f,#536f9e)}
.course-body{padding:18px}
.meta{font-size:12px;color:var(--muted);display:flex;gap:12px;margin:9px 0 14px}
.progress{height:8px;background:#edf1f6;border-radius:999px;overflow:hidden}
.progress span{display:block;height:100%;background:var(--primary);border-radius:inherit}
.row-between{display:flex;justify-content:space-between;gap:14px;align-items:center}
.badge{font-size:11px;font-weight:800;padding:5px 8px;border-radius:999px;background:#edf0ff;color:#5555c6}
.table-card{overflow:hidden}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:15px 18px;border-bottom:1px solid var(--border);font-size:14px}
th{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:#7b8799;background:#fafbfc}
td{color:#344054}
.status{display:inline-flex;padding:5px 9px;border-radius:999px;font-size:11px;font-weight:800}
.status.done{background:#e8f7f1;color:#177354}
.status.progressing{background:#fff5e4;color:#a6660f}
.video-wrap{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(280px,.7fr);gap:22px}
.video-box{background:#090d18;border-radius:20px;overflow:hidden;aspect-ratio:16/9;display:grid;place-items:center;color:#fff;position:relative}
.video-box video{width:100%;height:100%;object-fit:cover}
.lesson-list{padding:18px}
.lesson{padding:13px 0;border-bottom:1px solid var(--border);display:flex;gap:12px}
.lesson:last-child{border-bottom:0}
.lesson-num{width:30px;height:30px;border-radius:9px;background:#edf0ff;color:var(--primary);display:grid;place-items:center;font-weight:800;font-size:12px}
.quiz-shell{max-width:860px}
.quiz-card{padding:26px;margin-top:18px}
.option{display:block;border:1px solid var(--border);border-radius:13px;padding:13px 14px;margin:10px 0;cursor:pointer}
.option:hover{border-color:#babaf4;background:#fafaff}
.option input{margin-right:10px}
.result{margin-top:15px;padding:14px;border-radius:12px;font-weight:650;display:none}
.result.show{display:block}
.result.ok{background:#e8f7f1;color:#167551}
.result.bad{background:#feecef;color:#a83240}
.profile-grid{display:grid;grid-template-columns:320px 1fr;gap:20px}
.profile-card{padding:26px;text-align:center}
.profile-big{width:84px;height:84px;margin:0 auto 15px;border-radius:50%;display:grid;place-items:center;background:#edf0ff;color:var(--primary);font-size:28px;font-weight:850}
.info-card{padding:24px}
.info-row{padding:14px 0;border-bottom:1px solid var(--border)}
.info-row:last-child{border:0}
.info-row small{display:block;color:var(--muted);margin-bottom:4px}
.login-page{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;background:#fff}
.login-art{
  background:linear-gradient(145deg,#121a2e,#2b3560 55%,#685ad0);padding:54px;
  color:#fff;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden
}
.login-art:before,.login-art:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.07)}
.login-art:before{width:350px;height:350px;right:-120px;top:-110px}
.login-art:after{width:250px;height:250px;left:-90px;bottom:-90px}
.login-art h1{font-size:45px;max-width:620px}
.login-art p{color:#cad3e7;max-width:600px;font-size:17px}
.login-main{display:grid;place-items:center;padding:32px}
.login-box{width:min(420px,100%)}
.login-box h2{font-size:30px;margin-bottom:8px}
.field{margin-top:17px}
.field label{display:block;font-size:13px;font-weight:750;margin-bottom:7px}
.field input{width:100%;border:1px solid var(--border);border-radius:12px;padding:12px 13px;outline:none}
.field input:focus{border-color:#8d88ec;box-shadow:0 0 0 3px #efefff}
.field-error{font-size:12px;color:var(--danger);margin-top:6px;min-height:18px}
.login-box .btn{width:100%;margin-top:8px;padding:13px}
.auth-error{display:none;margin-top:15px;background:#fff0f2;border:1px solid #f7ccd2;color:#a82f3e;padding:12px 14px;border-radius:12px;font-size:13px}
.auth-error.show{display:block}
.tiny{font-size:12px;color:var(--muted);margin-top:18px;text-align:center}
.mobile-menu{display:none}
@media(max-width:980px){
  .grid-4,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .video-wrap,.profile-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  .layout{display:block}
  .sidebar{display:none}
  .topbar{padding:0 18px;height:68px}
  .search{width:62vw}
  .content{padding:22px 18px 38px}
  .grid-4,.grid-3{grid-template-columns:1fr}
  .login-page{grid-template-columns:1fr}
  .login-art{min-height:300px;padding:34px}
  .login-art h1{font-size:34px}
  .login-main{padding:35px 22px}
}