:root{--brand:#4f46e5;--brand2:#7c3aed;--ink:#0f172a;--muted:#64748b;--bg:#f8fafc}.hero{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-radius:28px}.course-card{border:0;border-radius:20px;box-shadow:0 12px 35px rgba(15,23,42,.08);transition:.2s}.course-card:hover{transform:translateY(-3px)}.thumb{height:180px;object-fit:cover;background:#eef2ff;border-radius:20px 20px 0 0}.admin-sidebar{min-height:100vh;background:#111827}.admin-sidebar a{color:#cbd5e1;text-decoration:none;display:block;padding:.7rem 1rem;border-radius:.6rem}.admin-sidebar a:hover{background:#1f2937;color:#fff}.stat{border:0;border-radius:18px;box-shadow:0 8px 26px rgba(15,23,42,.06)}body{background:var(--bg);color:var(--ink)}