*{box-sizing:border-box}
:root{--red:#ed1c24;--blue:#39318d;--dark:#17152f;--light:#f6f7fb;--muted:#69707d;--border:#e5e7eb}
body{margin:0;font-family:Inter,Arial,sans-serif;background:var(--light);color:#202124}
a{color:var(--blue);text-decoration:none}
.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.topbar-inner{max-width:1200px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:12px 18px}
.brand img{height:52px;max-width:240px;object-fit:contain}
.nav{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.nav a,.btn{display:inline-block;padding:10px 14px;border-radius:9px;border:1px solid var(--border);background:#fff;color:#222;cursor:pointer}
.nav a.primary,.btn.primary{background:var(--blue);color:#fff;border-color:var(--blue)}
.btn.danger{background:#fff1f2;color:#b42318;border-color:#fecdd3}
.container{max-width:1200px;margin:0 auto;padding:24px 18px}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:20px;background:linear-gradient(135deg,#f7f7fb,#fff)}
.login-card{width:min(430px,100%);background:#fff;border-radius:18px;padding:30px;box-shadow:0 12px 45px rgba(20,20,50,.12)}
.login-logo{display:block;max-width:280px;width:100%;height:auto;margin:0 auto 20px}
h1,h2,h3{color:var(--dark);margin-top:0}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:0 2px 8px rgba(20,20,50,.04)}
.stat{font-size:30px;font-weight:800;color:var(--blue)}
label{font-weight:700;font-size:14px;display:block;margin:12px 0 6px}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid #d6d9e0;border-radius:9px;font:inherit;background:#fff}
textarea{min-height:100px;resize:vertical}
.form-actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:11px 10px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
th{background:#fafafa;font-size:13px}
.table-wrap{overflow:auto}
.alert{padding:12px 14px;border-radius:10px;margin:0 0 16px}
.alert.success{background:#ecfdf3;color:#067647}
.alert.error{background:#fef3f2;color:#b42318}
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.course-card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px}
.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#eef2ff;color:var(--blue);font-size:12px;font-weight:700}
.lesson-list{display:grid;gap:10px}
.lesson{display:flex;justify-content:space-between;gap:12px;align-items:center;background:#fff;border:1px solid var(--border);padding:14px;border-radius:10px}
.video{position:relative;padding-top:56.25%;overflow:hidden;border-radius:12px;background:#111}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.pdf-frame{width:100%;height:700px;border:1px solid var(--border);border-radius:10px;background:#fff}
.site-footer{text-align:center;color:var(--muted);padding:30px 18px}
.small{font-size:13px;color:var(--muted)}
.kicker{color:var(--red);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:12px}
.mobile-menu{display:none}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.course-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.topbar-inner{align-items:flex-start}.brand img{height:44px;max-width:190px}.nav{justify-content:flex-end}.nav a{padding:8px 10px;font-size:13px}.grid,.grid-2,.course-grid{grid-template-columns:1fr}.container{padding:18px 12px}.card{padding:15px}.lesson{align-items:flex-start;flex-direction:column}.pdf-frame{height:520px}h1{font-size:25px}}